Explicitly set sa_flags in sigaction.

Update docs/WHATSNEW for 05.00.00 release.
Preserve variables needed across iterations.
2026-04-16 22:38:37 +02:00 · 2024-06-06 10:42:04 -04:00 · 2024-06-06 10:28:38 -04:00 · 2024-06-05 15:08:12 -04:00 · 2024-06-05 09:15:10 -04:00 · 2024-06-05 09:08:04 -04:00
52 changed files with 5470 additions and 2861 deletions
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,3 +1,8 @@
+workflow:
+  rules:
+    - if: $CI_COMMIT_BRANCH =~ /wip/
+      when: never
+
 tests:
  image: 'debian:stable-slim'
  before_script:
--- a/build.tk
+++ b/build.tk
@@ -15,6 +15,8 @@
 # the next line restarts using wish \
 exec wish "$0" "$@"

+global RemindExecutable
+
 #***********************************************************************
 # %PROCEDURE: SetConfigDefaults
 # %ARGUMENTS:
@@ -40,7 +42,7 @@ proc SetConfigDefaults {} {
    set Config(WESTERN_HEMISPHERE) 1
    set Config(LANGUAGE) "English"
    set Config(INST_DIR) "/usr/local/bin"
-    set Config(MAN_DIR) "/usr/local/man"
+    set Config(MAN_DIR) "/usr/local/share/man"
 }

 #***********************************************************************
@@ -124,7 +126,7 @@ proc CreateMainDialog {} {
 #  Creates the "installation directories" dialog.
 #***********************************************************************
 proc CreateInstallDirDialog { w } {
-    global Config
+    global Config RemindExecutable
    label $w.binlabel -text "Location for programs: "
    entry $w.bin -width 30
    $w.bin insert end $Config(INST_DIR)
@@ -133,16 +135,19 @@ proc CreateInstallDirDialog { w } {
    entry $w.man -width 30
    $w.man insert end $Config(MAN_DIR)

-    text $w.blurb -width 1 -height 5 -wrap word -relief flat -takefocus 0
-    $w.blurb insert end "\n(Tabbed-notebook Tcl code taken from \"Effective Tcl/Tk Programming\" by Mark Harrison and Michael McLennan, Addison-Wesley Professional Computing Series.)"
-    $w.blurb configure -state disabled
-    # Disable all text-window behaviour
-    bindtags $w.blurb {NoSuchTag}
+    text $w.blurb -width 1 -height 20 -wrap word -relief flat -takefocus 0
+    if { "$RemindExecutable" != "" } {
+        $w.blurb insert end "Note: Default settings were obtained by querying the existing installed version of Remind found at: $RemindExecutable\n"
+    }
+    $w.blurb insert end "\n(Tabbed-notebook Tcl code taken from \"Effective Tcl/Tk Programming\" by Mark Harrison and Michael McLennan, Addison-Wesley Professional Computing Series.)\n"
    grid $w.binlabel -row 0 -column 0 -sticky e
    grid $w.bin -row 0 -column 1 -sticky nsew
    grid $w.manlabel -row 1 -column 0 -sticky e
    grid $w.man -row 1 -column 1 -sticky nsew
    grid $w.blurb - -sticky nsew
+    # Disable all text-window behaviour
+    bindtags $w.blurb {NoSuchTag}
+    $w.blurb configure -state disabled
 }

 #***********************************************************************
@@ -727,7 +732,7 @@ proc notebook_fix_size {win} {
 #***********************************************************************
 proc FindRemind {} {
    global env
-    set path [concat [split $env(PATH) ":"] "/bin" "/usr/bin" "/usr/local/bin"]
+    set path [concat [split $env(PATH) ":"] "/usr/local/bin" "/bin" "/usr/bin" ]
    foreach thing $path {
 	if [file executable [file join $thing "remind"]] {
 	    return [file join $thing "remind"]
@@ -745,16 +750,17 @@ proc FindRemind {} {
 #  sensible defaults.
 #***********************************************************************
 proc SetConfigFromRemind {} {
-    global Config
+    global Config RemindExecutable
    SetConfigDefaults
    set rem [FindRemind]
+    set RemindExecutable $rem
    if {"$rem" == ""} {
 	return
    }
    set dir [file dirname $rem]
    set Config(INST_DIR) $dir
    if {"$dir" == "/usr/local/bin"} {
-	set Config(MAN_DIR) "/usr/local/man"
+	set Config(MAN_DIR) "/usr/local/share/man"
    } elseif {$dir == "/usr/bin"} {
 	set Config(MAN_DIR) "/usr/share/man"
    }
@@ -764,6 +770,8 @@ proc SetConfigFromRemind {} {
 	set Config(MAN_DIR) "/usr/share/man"
    } elseif {[file readable "/usr/man/man1/remind.1"]} {
 	set Config(MAN_DIR) "/usr/man"
+    } elseif {[file readable "/usr/local/share/man/man1/remind.1"]} {
+	set Config(MAN_DIR) "/usr/local/share/man"
    } elseif {[file readable "/usr/local/man/man1/remind.1"]} {
 	set Config(MAN_DIR) "/usr/local/man"
    }
--- a/115
+++ b/115
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.71.
+# Generated by GNU Autoconf 2.71 for remind 05.00.00.
 #
 #
 # Copyright (C) 1992-1996, 1998-2017, 2020-2021 Free Software Foundation,
@@ -606,12 +606,12 @@ MFLAGS=
 MAKEFLAGS=

 # Identity of this package.
-PACKAGE_NAME=''
-PACKAGE_TARNAME=''
-PACKAGE_VERSION=''
-PACKAGE_STRING=''
+PACKAGE_NAME='remind'
+PACKAGE_TARNAME='remind'
+PACKAGE_VERSION='05.00.00'
+PACKAGE_STRING='remind 05.00.00'
 PACKAGE_BUGREPORT=''
-PACKAGE_URL=''
+PACKAGE_URL='https://dianne.skoll.ca/projects/remind/'

 ac_unique_file="src/queue.c"
 # Factoring default headers for most tests.
@@ -757,7 +757,7 @@ localstatedir='${prefix}/var'
 runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
-docdir='${datarootdir}/doc/${PACKAGE}'
+docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
 infodir='${datarootdir}/info'
 htmldir='${docdir}'
 dvidir='${docdir}'
@@ -1264,7 +1264,7 @@ if test "$ac_init_help" = "long"; then
  # Omit some internal or obsolete options to make the list less imposing.
  # This message is too long to be a string in the A/UX 3.1 sh.
  cat <<_ACEOF
-\`configure' configures this package to adapt to many kinds of systems.
+\`configure' configures remind 05.00.00 to adapt to many kinds of systems.

 Usage: $0 [OPTION]... [VAR=VALUE]...

@@ -1313,7 +1313,7 @@ Fine tuning of the installation directories:
  --infodir=DIR           info documentation [DATAROOTDIR/info]
  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
  --mandir=DIR            man documentation [DATAROOTDIR/man]
-  --docdir=DIR            documentation root [DATAROOTDIR/doc/PACKAGE]
+  --docdir=DIR            documentation root [DATAROOTDIR/doc/remind]
  --htmldir=DIR           html documentation [DOCDIR]
  --dvidir=DIR            dvi documentation [DOCDIR]
  --pdfdir=DIR            pdf documentation [DOCDIR]
@@ -1325,7 +1325,9 @@ _ACEOF
 fi

 if test -n "$ac_init_help"; then
-
+  case $ac_init_help in
+     short | recursive ) echo "Configuration of remind 05.00.00:";;
+   esac
  cat <<\_ACEOF

 Optional Features:
@@ -1348,6 +1350,7 @@ Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.

 Report bugs to the package provider.
+remind home page: <https://dianne.skoll.ca/projects/remind/>.
 _ACEOF
 ac_status=$?
 fi
@@ -1411,7 +1414,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
  cat <<\_ACEOF
-configure
+remind configure 05.00.00
 generated by GNU Autoconf 2.71

 Copyright (C) 2021 Free Software Foundation, Inc.
@@ -1861,7 +1864,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.

-It was created by $as_me, which was
+It was created by remind $as_me 05.00.00, which was
 generated by GNU Autoconf 2.71.  Invocation command line was

  $ $0$ac_configure_args_raw
@@ -2450,7 +2453,6 @@ as_fn_append ac_header_c_list " sys/stat.h sys_stat_h HAVE_SYS_STAT_H"
 as_fn_append ac_header_c_list " sys/types.h sys_types_h HAVE_SYS_TYPES_H"
 as_fn_append ac_header_c_list " unistd.h unistd_h HAVE_UNISTD_H"
 as_fn_append ac_header_c_list " sys/time.h sys_time_h HAVE_SYS_TIME_H"
-as_fn_append ac_header_c_list " utime.h utime_h HAVE_UTIME_H"

 # Auxiliary files required by this configure script.
 ac_aux_files="install-sh"
@@ -4004,6 +4006,12 @@ printf "%s\n" "#define SIZEOF_TIME_T $ac_cv_sizeof_time_t" >>confdefs.h



+ac_fn_c_check_header_compile "$LINENO" "strings.h" "ac_cv_header_strings_h" "$ac_includes_default"
+if test "x$ac_cv_header_strings_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_STRINGS_H 1" >>confdefs.h
+
+fi
 ac_fn_c_check_header_compile "$LINENO" "sys/types.h" "ac_cv_header_sys_types_h" "$ac_includes_default"
 if test "x$ac_cv_header_sys_types_h" = xyes
 then :
@@ -4080,60 +4088,6 @@ printf "%s\n" "#define TM_IN_SYS_TIME 1" >>confdefs.h
 fi


-
-
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether utime accepts a null argument" >&5
-printf %s "checking whether utime accepts a null argument... " >&6; }
-if test ${ac_cv_func_utime_null+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  rm -f conftest.data; >conftest.data
-# Sequent interprets utime(file, 0) to mean use start of epoch.  Wrong.
-if test "$cross_compiling" = yes
-then :
-  ac_cv_func_utime_null='guessing yes'
-else $as_nop
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-$ac_includes_default
-	       #ifdef HAVE_UTIME_H
-	       # include <utime.h>
-	       #endif
-int
-main (void)
-{
-struct stat s, t;
-  return ! (stat ("conftest.data", &s) == 0
-	    && utime ("conftest.data", 0) == 0
-	    && stat ("conftest.data", &t) == 0
-	    && t.st_mtime >= s.st_mtime
-	    && t.st_mtime - s.st_mtime < 120);
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_run "$LINENO"
-then :
-  ac_cv_func_utime_null=yes
-else $as_nop
-  ac_cv_func_utime_null=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_utime_null" >&5
-printf "%s\n" "$ac_cv_func_utime_null" >&6; }
-if test "x$ac_cv_func_utime_null" != xno; then
-  ac_cv_func_utime_null=yes
-
-printf "%s\n" "#define HAVE_UTIME_NULL 1" >>confdefs.h
-
-fi
-rm -f conftest.data
-
 if test "$GCC" = yes; then
 	CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
        # Check for link-time optimization support
@@ -4181,6 +4135,24 @@ if test "$?" != 0 ; then
    echo "*** COULD NOT DETERMINE RELEASE DATE: docs/WHATSNEW is incorrect!"
    exit 1
 fi
+ac_fn_c_check_func "$LINENO" "strdup" "ac_cv_func_strdup"
+if test "x$ac_cv_func_strdup" = xyes
+then :
+  printf "%s\n" "#define HAVE_STRDUP 1" >>confdefs.h
+
+fi
+ac_fn_c_check_func "$LINENO" "strcasecmp" "ac_cv_func_strcasecmp"
+if test "x$ac_cv_func_strcasecmp" = xyes
+then :
+  printf "%s\n" "#define HAVE_STRCASECMP 1" >>confdefs.h
+
+fi
+ac_fn_c_check_func "$LINENO" "strncasecmp" "ac_cv_func_strncasecmp"
+if test "x$ac_cv_func_strncasecmp" = xyes
+then :
+  printf "%s\n" "#define HAVE_STRNCASECMP 1" >>confdefs.h
+
+fi
 ac_fn_c_check_func "$LINENO" "setenv" "ac_cv_func_setenv"
 if test "x$ac_cv_func_setenv" = xyes
 then :
@@ -4225,7 +4197,7 @@ then :
 fi


-VERSION=04.03.06
+VERSION=$PACKAGE_VERSION



@@ -4731,7 +4703,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by $as_me, which was
+This file was extended by remind $as_me 05.00.00, which was
 generated by GNU Autoconf 2.71.  Invocation command line was

  CONFIG_FILES    = $CONFIG_FILES
@@ -4787,7 +4759,8 @@ $config_files
 Configuration headers:
 $config_headers

-Report bugs to the package provider."
+Report bugs to the package provider.
+remind home page: <https://dianne.skoll.ca/projects/remind/>."

 _ACEOF
 ac_cs_config=`printf "%s\n" "$ac_configure_args" | sed "$ac_safe_unquote"`
@@ -4795,7 +4768,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-config.status
+remind config.status 05.00.00
 configured by $0, generated by GNU Autoconf 2.71,
  with options \\"\$ac_cs_config\\"

--- a/configure.in
+++ b/configure.in
@@ -1,6 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.

-AC_INIT
+AC_INIT(remind, 05.00.00, , , https://dianne.skoll.ca/projects/remind/)
 AC_CONFIG_SRCDIR([src/queue.c])

 cat <<'EOF'
@@ -30,7 +30,7 @@ AC_PATH_PROG([PERL], [perl])

 dnl Checks for libraries.
 AC_CHECK_LIB(m, sqrt)
-AC_CHECK_HEADERS_ONCE([sys/time.h])
+AC_CHECK_HEADERS_ONCE([sys/time.h stdint.h])

 dnl Integer sizes
 AC_CHECK_SIZEOF(unsigned int)
@@ -38,13 +38,11 @@ AC_CHECK_SIZEOF(unsigned long)
 AC_CHECK_SIZEOF(time_t)

 dnl Checks for header files.
-AC_CHECK_HEADERS(sys/types.h glob.h wctype.h locale.h langinfo.h sys/inotify.h)
+AC_CHECK_HEADERS(strings.h sys/types.h glob.h wctype.h locale.h langinfo.h sys/inotify.h)

 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_STRUCT_TM

-dnl Checks for library functions.
-AC_FUNC_UTIME_NULL
 if test "$GCC" = yes; then
 	CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
        # Check for link-time optimization support
@@ -86,9 +84,9 @@ if test "$?" != 0 ; then
    echo "*** COULD NOT DETERMINE RELEASE DATE: docs/WHATSNEW is incorrect!"
    exit 1
 fi
-AC_CHECK_FUNCS(setenv unsetenv glob mbstowcs setlocale initgroups inotify_init1)
+AC_CHECK_FUNCS(strdup strcasecmp strncasecmp setenv unsetenv glob mbstowcs setlocale initgroups inotify_init1)

-VERSION=04.03.06
+VERSION=$PACKAGE_VERSION
 AC_SUBST(VERSION)
 AC_SUBST(PERL)
 AC_SUBST(PERLARTIFACTS)
--- a/docs/WHATSNEW
+++ b/docs/WHATSNEW
@@ -1,7 +1,105 @@
 CHANGES TO REMIND

+* VERSION 5.0 Patch 0 - 2024-06-06
+
+* MAJOR CHANGE: The expression evaluation engine has been completely replaced
+  with a new one that splits parsing and evaluating into two separate steps.
+  It also features short-circuit evaluation of &&, ||, iif() and choose().
+  This should speed up expression-heavy reminder files.
+
+  NOTE INCOMPATIBILITY: In expressions with side-effects, the short-circuit
+  evaluation might change the result you get.  For example, consider
+  running the following file through: remind file.rem 2024-06-04
+
+    SET a trig("Mon +7") || trig("Thu +7")
+    MSG trig = [trig()]
+
+  Older Remind versions will output:
+
+    trig = 2024-06-06
+
+  whereas this version outputs:
+
+    trig = 2024-06-10
+
+  because the second part of the "||" expression is not evaluated.  The vast
+  majority of Remind expressions do not have side-effects and should yield
+  the same results as before.
+
+  The newer expression engine also permits recursive functions, but
+  these are not recommended.  Still, if you want to, you can do:
+
+    fset factorial(n) iif(n <= 1, 1, n*factorial(n-1))
+
+  and it will work for values of n that don't cause integer overflow.
+
+* IMPROVEMENT: If there's an unmatched PUSH-OMIT-CONTEXT, print the
+  filename and line number containing it.
+
+* IMPROVEMENT: If there's an IF with a missing ENDIF, print the filename
+  and line number of the IF statement.
+
+* NEW FEATURE: Add EXPR OFF command to completely disable expression
+  evaluation.  Useful if you INCLUDE files that you don't expect to
+  contain expressions and may come from slightly untrustworthy sources.
+
+* NEW FEATURE: Add $ExpressionTimeLimit system variable to enforce a
+  maximum limit on how long evaluating an expression is allowed to take.
+
+* NEW FEATURE: Add --max-execution-time=n command-line option to terminate
+  Remind if it runs for more than n seconds.
+
+* CHANGE: Make the command-line option "-ifoo" equivalent to "-ifoo=0"
+
+* CHANGE: Permit a literal [ in a reminder by using the sequence [[
+  The old ["["] still works.
+
+* BUG FIX: In "purge" mode, Remind would sometimes purge reminders with
+  a relative "SCANFROM" which haven't actually expired.  This has been fixed.
+
+* BUG FIX: Disallow something like: FSET func(x, x) expr
+  which shouldn't have been allowed in the first place.
+
+* BUG FIX: Replace leading spaces with tabs in Makefiles (per Emanuele Torre
+  and Tim Chase)
+
+* VERSION 4.3 Patch 7 - 2024-04-29
+
+* IMPROVEMENT: build.tk: Add a note if build.tk obtains default settings
+  from an existing Remind installation.
+
+* IMPROVEMENT: configure: Pass all args to AC_INIT including the Remind
+  home page.  Remove some unused autoconf cruft.
+
+* IMPROVEMENT: Use standard C library versions of strdup, strcasecmp and
+  strncasecmp where available, rather than using our own versions.
+
+* MINOR FEATURE: remind: Make $Tt a synonym for trigtime().
+
+* BUG FIX: remind: Make sure shellescape() doesn't mangle UTF-8 characters
+  with high-bits set.
+
+* BUG FIX: remind: Don't rely on undefined behavior of "%" operator in
+  the ord() built-in function.
+
+* BUG FIX: remind: Do not clear out trigtime() unnecessarily.  Before,
+  you could not write things like the following; now you can:
+
+      REM Tue AT 11:30 DURATION 0:30 MSG Thing 1
+      REM Tue AT [trigtime()+trigduration()] DURATION 1:00 MSG Thing 2
+      REM Tue AT [trigtime()+trigduration()] DURATION 0:45 MSG Thing 3
+
+  for successive reminders that should be moved as a block if the time of
+  the first one changes.
+
+* BUG FIX: Don't update trigdate() or trigtime() while parsing a REM
+  statement... only when actually computing the trigger.
+
 * VERSION 4.3 Patch 6 - 2024-04-02

+* NEW FILE: Add [$SysInclude]/holidays/pt.rem - Portuguese holidays, courtesy
+  of Joop Kiefte.
+
 * BUG FIX: remind: Fix compile error on systems that don't support inotify(7).

 * BUG FIX: remind: Fix test failures on FreeBSD.  On FreeBSD, you have to copy
--- a/include/holidays/jewish.rem
+++ b/include/holidays/jewish.rem
@@ -106,7 +106,3 @@ IF !Reform
   [_PastSat(17, "Tamuz")] ++4 MSG %"Tzom Tammuz%" is %b.
   [_PastSat(9,  "Av")] ++4 MSG %"Tish'a B'Av%" is %b.
 ENDIF
-
-# Clean up
-FUNSET _h _h2 _PastSat _BackTwoFri _BackTwoSat _chan
-
--- a/include/lang/auto.rem
+++ b/include/lang/auto.rem
@@ -1,24 +1,28 @@
 # SPDX-License-Identifier: GPL-2.0-only
-SET autolang getenv("REMIND_LANG")
+if !defined("__autolang__")
+    SET __autolang__ 1
+    PRESERVE __autolang__
+    SET autolang getenv("REMIND_LANG")

-IF autolang == ""
-    SET autolang getenv("LC_ALL")
-ENDIF
-IF autolang == ""
-    SET autolang getenv("LANGUAGE")
-ENDIF
-IF autolang == ""
-    SET autolang getenv("LANG")
-ENDIF
+    IF autolang == ""
+        SET autolang getenv("LC_ALL")
+    ENDIF
+    IF autolang == ""
+        SET autolang getenv("LANGUAGE")
+    ENDIF
+    IF autolang == ""
+        SET autolang getenv("LANG")
+    ENDIF

-IF autolang != ""
-    IF access($SysInclude + "/lang/" + lower(substr(autolang, 1, 5)) + ".rem", "r") == 0
-        INCLUDE [$SysInclude]/lang/[lower(substr(autolang, 1, 5))].rem
-    ELSE
-        IF access($SysInclude + "/lang/" + lower(substr(autolang, 1, 2)) + ".rem", "r") == 0
-            INCLUDE [$SysInclude]/lang/[lower(substr(autolang, 1, 2))].rem
+    IF autolang != ""
+        IF access($SysInclude + "/lang/" + lower(substr(autolang, 1, 5)) + ".rem", "r") == 0
+            INCLUDE [$SysInclude]/lang/[lower(substr(autolang, 1, 5))].rem
+        ELSE
+            IF access($SysInclude + "/lang/" + lower(substr(autolang, 1, 2)) + ".rem", "r") == 0
+                INCLUDE [$SysInclude]/lang/[lower(substr(autolang, 1, 2))].rem
+            ENDIF
        ENDIF
    ENDIF
+    UNSET autolang
 ENDIF

-UNSET autolang
--- a/include/lang/de.rem
+++ b/include/lang/de.rem
@@ -87,3 +87,5 @@ SET daylightST_starts_str        "Beginn Sommerzeit"

 # Daylight saving time ends
 SET daylightST_ends_str          "Ende Sommerzeit"
+
+PRESERVE earthseasons_Perihelion_str earthseasons_EquinoxMar_str earthseasons_SolsticeJun_str earthseasons_Aphelion_str earthseasons_EquinoxSep_str earthseasons_SolsticeDec_str daylightST_starts_str daylightST_ends_str
--- a/include/lang/gr.rem
+++ b/include/lang/gr.rem
@@ -81,3 +81,5 @@ SET daylightST_starts_str        "Έναρξη θέρους"

 # Daylight saving time ends
 SET daylightST_ends_str          "Τέλος θέρους"
+
+PRESERVE earthseasons_Perihelion_str earthseasons_EquinoxMar_str earthseasons_SolsticeJun_str earthseasons_Aphelion_str earthseasons_EquinoxSep_str earthseasons_SolsticeDec_str daylightST_starts_str daylightST_ends_str
--- a/man/remind.1.in
+++ b/man/remind.1.in
@@ -28,10 +28,6 @@ Anything after the __EOF__ marker is completely ignored.
 \fBRemind\fR has a slew of options.  If you're new to the program,
 ignore them for now and skip to the section "REMINDER FILES".
 .TP
-.B \-\-version
-The \fB\-\-version\fR option causes \fBRemind\fR to print its version number
-to standard output and then exit.
-.TP
 .B \-n
 The \fB\-n\fR option causes \fBRemind\fR to print the \fBnext\fR occurrence
 of each reminder in a simple calendar format.  You can sort this by
@@ -302,9 +298,9 @@ Echo lines when displaying error messages
 Trace the reading of reminder files
 .TP
 .B s
-Upon exit, print the high-water mark of the operator and value stacks
-used for expression-parsing.  This is unlikely to be useful unless
-you're intimately familiar with Remind's source code.
+Trace expression parsing and display the internal expression node
+tree.  This is unlikely to be useful unless you are working on
+\fBRemind\fR's expression evaluation engine.
 .RE
 .TP
 \fB\-g\fR[\fBa|d\fR[\fBa|d\fR[\fBa|d\fR[\fBa|d\fR]]]]
@@ -420,7 +416,9 @@ TAG clause.
 \fB\-i\fR\fIvar\fR\fB=\fR\fIexpr\fR
 Sets the value of the specified \fIvar\fR to \fIexpr\fR, and \fBpreserves\fR
 \fIvar\fR.  \fIExpr\fR can be any valid \fBRemind\fR expression.  See the
-section "INITIALIZING VARIABLES ON THE COMMAND LINE" for more details.
+section "INITIALIZING VARIABLES ON THE COMMAND LINE" for more details.  If
+you omit the \fB=\fR\fIexpr\fR part, then \fIvar\fR is initialized to 0.
+In other words, \fB\-i\fIvar\fR is exactly the same as \fB\-i\fIvar\fR\fB=\fR0.
 .TP
 \fB\-i\fR\fIfunc\fR(\fIargs\fR)=\fIdefinition\fR
 Allows you to define a function on the command line.
@@ -451,6 +449,30 @@ with the date incrementing on each iteration.  You may have to enclose
 the parameter in quotes to avoid shell expansion.  See the subsection
 "Repeated Execution" in the section "CALENDAR MODE" for more
 information.
+
+.SH LONG OPTIONS
+
+\fBRemind\fR supports the following long options, which \fIare\fR
+case-sensitive:
+
+.RP
+.B \-\-version
+The \fB\-\-version\fR option causes \fBRemind\fR to print its version number
+to standard output and then exit.
+.TP
+.B \-\-max-execution-time\fR=\fIn\fR
+Limit the total execution time (as measured by the wall clock) to
+\fIn\fR seconds.  This is useful if \fBRemind\fR is invoked on
+potentially-untrustworthy files that could attempt to use a lot of
+resources.  Note that the limit \fIn\fR is approximate and
+\fBRemind\fR might execute for one or two more seconds before it is
+killed.  If \fIn\fR is specified as zero, then no limit is applied, just
+as if the option had not been used at all.
+.PP
+If a limit is applied, it applies only to the foreground run of \fBRemind\fR.
+If \fBRemind\fR finishes processing the script and then starts handling
+queued reminders, the time limit is reset to no limit.
+.PP
 .SH REMINDER FILES
 .PP
 \fBRemind\fR uses scripts to control its operation.  You can use any
@@ -1880,24 +1902,6 @@ If you run \fBRemind\fR with the \fB\-r\fR command-line option,
 regardless of any \fBRUN\fR commands in the reminder script.  However,
 any command supplied with the \fB\-k\fR option will still be executed.
 .PP
-One use of the \fBRUN\fR command is to provide a secure interface
-between \fBRemind\fR and the \fBElm\fR mail system.  The \fBElm\fR
-system can automatically scan incoming mail for reminder or calendar
-entries, and place them in your calendar file.  To use this feature,
-you should set the calendar filename option under \fBElm\fR to be something
-like "~/.reminders.in", \fInot\fR your main reminder file!  This is
-so that any \fBRUN ON\fR commands mailed to you can never be activated.
-.PP
-Then, you can use the \fBElm\fR \fIscan message for calendar entries\fR
-command to place reminders prefaced by "->" into .reminders.in.  In
-your main .reminders file, include the following lines:
-.PP
-.nf
-	RUN OFF   # Disable RUN
-	INCLUDE .reminders.in
-	RUN ON    # Re-enable RUN
-.fi
-.PP
 In addition, \fBRemind\fR contains a few other security
 features.  It will not read a file that is group- or world-writable.
 It will not run set-uid.  If it reads a file you don't own, it will
@@ -1909,6 +1913,30 @@ attempt to check the ownership of standard input, even if it is
 coming from a file, and hence does \fInot\fR disable RUN and shell()
 in this situation.

+.PP
+.SH THE EXPR COMMAND
+.PP
+\fBRemind\fR lets you completely disable expression evaluation.  This
+could be useful if you are running Remind on a somewhat-untrustworthy
+file that is not expected to contain expressions.  To disable
+expression evaluation, use:
+.PP
+.nf
+        EXPR OFF
+.fi
+.PP
+If \fBRemind\fR encounters an expression while EXPR OFF is in effect, it
+returns an error
+.PP
+To re-enable expression evaluation, use:
+.PP
+.nf
+        EXPR ON
+.fi
+.PP
+As with \fBRUN ON\fB, \fBEXPR ON\fR can be used only in the top-level
+script, not in an included file.
+.PP
 .SH THE INCLUDECMD COMMAND
 .PP
 \fBRemind\fR allows you to execute a shell command and evaluate the
@@ -2161,13 +2189,13 @@ than those on higher lines.  The operators approximately correspond to
 C operators.
 .PP
 .nf
-	!  -     (unary logical negation and arithmetic negation)
-	*  /  %
-	+  -
-	<  <=  >  >=
-	==  !=
-	&&
-	||
+	!  -            (unary logical negation and arithmetic negation)
+	*  /  %         (multiplication, division, modulus)
+	+  -            (addition/concatenation, subtraction)
+	<  <=  >  >=    (comparisons)
+	==  !=          (equality and inequality tests)
+	&&              (logical AND)
+	||              (logical OR)
 .fi
 .PP
 .B DESCRIPTION OF OPERATORS
@@ -2279,16 +2307,15 @@ If the operands are not of the same type, == returns 0 and != returns
 .RE
 .TP
 .B &&
-This is the logical AND operator.  Both of its operands must be of the
-same type and must not be \fBSTRING\fR type.  Returns the second
-operand if both operands are non-zero.  Otherwise, returns a zero
-of the same type as the operands.
+This is the logical AND operator.  Neither of its operands can be
+\fBSTRING\fR type.  Returns the second operand if both operands are
+non-zero.  Otherwise, returns whichever operand is zero.
 .TP
 .B ||
-This is the logical OR operator.  Both of its operands must be of
-the same type and must not be of \fBSTRING\fR type.  It returns
-the first operand that is non-zero; if both operands are zero, then
-returns a zero of the same type as the operands.
+This is the logical OR operator.  Neither of its operands can be
+\fBSTRING\fR type.  It returns the first operand that is non-zero; if
+both operands are zero, then returns the second operand.
+
 .PP
 .B NOTES
 .PP
@@ -2309,15 +2336,10 @@ For example:
 	12:59 + (1 + "test")  yields "12:591test"
 .fi
 .PP
-The logical operators are \fInot\fR so-called short-circuit operators, as
-they are in C.  Both operands are always evaluated.  Thus, an expression
-such as:
-.PP
-.nf
-	(f!=0) && (100/f <= 3)
-.fi
-.PP
-will cause an error if f is zero.
+The logical operators are so-called short-circuit operators, as
+they are in C.  This means that if the first operand of || is true,
+then the second operand is \fInot\fR evaluated.  Similarly, if the first
+operand of && is false, then the second operand is \fInot\fR evaluated.
 .PP
 .B VARIABLES
 .PP
@@ -2474,6 +2496,14 @@ because the final parenthesis and quote are ignored (for the purposes
 of spacing) when they follow a period.
 .RE
 .TP
+.B $ExpressionTimeLimit
+If set to a non-zero value \fIn\fR, than any expression that takes longer than
+\fIn\fR seconds to evaluate will be aborted and an error returned.  This is
+to prevent maliciously-crafted expressions for creating a denial-of-service.
+In an included file, $ExpressionTimeLimit can only be lowered from its
+current value.  In the top-level file, it can be set to any value, including
+zero to disable the time limit.
+.TP
 .B $FirstIndent
 The number of spaces by which to indent the first line of a \fBMSF\fR-type
 reminder.  The default is 0.
@@ -2747,6 +2777,9 @@ Equivalent to \fBwkdaynum(trigdate())\fR.
 .B $Ty (read-only)
 Equivalent to \fByear(trigdate())\fR.
 .TP
+.B $Tt (read-only, TIME type)
+Equivalent to \fBtrigtime()\fR.
+.TP
 .B $TimeSep
 This variable can be set only to ":" or ".".  It holds the character
 used to separate portions of a time when \fBRemind\fR prints a TIME or
@@ -3835,7 +3868,7 @@ function for advance warning to work properly.  This is because
 \fBtrig\fR returns a date constant (the trigger date) and the
 REM command does not know the details of \fBtrig\fR's arguments.
 .PP
-Note that because \fBRemind\fR does not have short-circuit logical
+Note that because \fBRemind\fR has short-circuit logical
 operators, something like:
 .PP
 .nf
@@ -3843,58 +3876,9 @@ operators, something like:
 .fi

 would set the value of trig() to the date of the following
-Thursday.  Even though trig("Mon +7") always returns true,
-the logical-OR operator still evaluates trig("Fri +7") which
-\fIalso\fR returns true and sets \fBtrig()\fR.
-.PP
-You can work around the lack of a short-circuit logical-OR as follows:
-If \fBtrig\fR returns a true value, the specific value it returns
-can be coerced to a DATE which is the trigger date.  So the following code:
-.PP
-.nf
-    SET a trig("Mon +4") || trig("Fri +4")
-    IF a
-        REM [a] +4 MSG [wkday($T)] %b.
-    ENDIF
-.fi
-.PP
-would operate as follows:
-.PP
-.nf
-    On Monday:    Monday today.
-    On Tuesday:   Friday in 3 days' time.
-    On Wednesday: Friday in 2 days' time.
-    On Thursday:  Monday in 4 days' time.
-    On Friday:    Monday in 3 days' time.
-    On Saturday:  Monday in 2 days' time.
-    On Sunday:    Monday tomorrow.
-.fi
-.PP
-Compare with the following:
-.PP
-.nf
-    SET a trig("Mon +4") || trig("Fri +4")
-    IF a
-        REM [trig()] +4 MSG [wkday($T)] %b.
-    ENDIF
-.fi
-.PP
-which yields:
-.PP
-.nf
-    On Monday:    Friday in 4 days' time.
-    On Tuesday:   Friday in 3 days' time.
-    On Wednesday: Friday in 2 days' time.
-    On Thursday:  Friday tomorrow.
-    On Friday:    Friday today.
-    On Saturday:  Monday in 2 days' time.
-    On Sunday:    Monday tomorrow.
-.fi
-.PP
-That is because \fBtrig()\fR returns the trigger date of
-the \fIlast\fR trig function that returns true,
-whereas the value of \fBa\fR is the trigger date of the \fIfirst\fR
-trig function that returns true.
+Monday.  Because trig("Mon +7") always returns true,
+the logical-OR operator does not bother evaluating trig("Fri +7") which
+therefore does not set \fBtrig()\fR.
 .PP
 \fBImportant Note\fR:  Because \fBtrig()\fR always returns an absolute
 date, it will \fBnot\fR work properly with a \fBSATISFY\fR clause.
@@ -4234,6 +4218,14 @@ with square brackets.  For example:
 This evaluates the expression "mydate", where "mydate" is
 presumably some pre-computed variable, and then "pastes" the result
 into the command-line for the parser to process.
+.PP
+If you want a literal "[" character for some reason, simply use "[[".  For
+example:
+.PP
+.nf
+        REM MSG Here are [[square] brackets!
+.fi
+
 .PP
 A formal description of this is:  When \fBRemind\fR encounters a
 "pasted-in" expression, it evaluates the expression, and coerces the
@@ -4781,7 +4773,7 @@ under program control.  The format is:
 .PP
 \fBDEBUG\fR [+\fIflagson\fR] [\-\fIflagsoff\fR]
 .PP
-\fIFlagson\fR and \fIflagsoff\fR consist of strings of the characters "extvlf"
+\fIFlagson\fR and \fIflagsoff\fR consist of strings of the characters "extvlfs"
 that correspond to the debugging options discussed in the command-line
 options section.  If preceded with a "+", the corresponding group of
 debugging options is switched on.  Otherwise, they are switched off.
--- a/rem2html/Makefile.in
+++ b/rem2html/Makefile.in
@@ -15,7 +15,7 @@ install:
 	@if test "$(PERL)" = "" ; then \
 	    echo "Not installing rem2html; Perl is required"; exit 0; fi; \
 	 for m in $(PERLMODS_NEEDED) ; \
-         do \
+	do \
 	    $(PERL) -M$$m -e 1 > /dev/null 2>&1; \
 	    if test $$? != 0 ; then echo "Not installing rem2html; missing $$m"; exit 0; fi; \
 	done; \
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -30,7 +30,7 @@ REMINDSRCS=	calendar.c dynbuf.c dorem.c dosubst.c expr.c files.c funcs.c \
 		globals.c hbcal.c init.c main.c md5.c moon.c omit.c queue.c \
 		sort.c token.c trigger.c userfns.c utils.c var.c

-REMINDHDRS=config.h custom.h dynbuf.h err.h expr.h globals.h lang.h \
+REMINDHDRS=config.h custom.h dynbuf.h err.h globals.h lang.h \
 	   md5.h protos.h rem2ps.h types.h version.h
 REMINDOBJS= $(REMINDSRCS:.c=.o)

@@ -72,7 +72,7 @@ install: all
 	    update-desktop-database < /dev/null > /dev/null 2>&1 ; \
 	    xdg-icon-resource install --novendor --size 64 $(DESTDIR)$(prefix)/share/pixmaps/tkremind.png < /dev/null > /dev/null 2>&1 || true; \
 	    xdg-desktop-menu install --novendor $(DESTDIR)$(prefix)/share/applications/tkremind.desktop < /dev/null > /dev/null 2>&1 || true; \
-        fi
+	fi

 install-stripped: install
 	strip $(DESTDIR)$(bindir)/remind || true
--- a/src/calendar.c
+++ b/src/calendar.c
@@ -35,7 +35,6 @@
 #include "lang.h"
 #include "types.h"
 #include "protos.h"
-#include "expr.h"
 #include "globals.h"
 #include "err.h"
 #include "md5.h"
@@ -1670,6 +1669,7 @@ static void GenerateCalEntries(int col)
 	    case T_Pop:     r=PopOmitContext(&p);     break;
 	    case T_Push:    r=PushOmitContext(&p);    break;
 	    case T_Preserve: r=DoPreserve(&p);        break;
+            case T_Expr: r = DoExpr(&p);              break;
 	    case T_RemType: if (tok.val == RUN_TYPE) {
 		r=DoRun(&p);
 		break;
@@ -1770,7 +1770,7 @@ static int DoCalRem(ParsePtr p, int col)
    DBufInit(&raw_buf);

    /* Parse the trigger date and time */
-    if ( (r=ParseRem(p, &trig, &tim, 1)) ) {
+    if ( (r=ParseRem(p, &trig, &tim)) ) {
 	FreeTrig(&trig);
 	return r;
    }
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -1,9 +1,3 @@
-/* Define if utime(file, NULL) sets file's timestamp to the present.  */
-#undef HAVE_UTIME_NULL
-
-/* Define if you can safely include both <sys/time.h> and <time.h>.  */
-#undef TIME_WITH_SYS_TIME
-
 /* Define if your <sys/time.h> declares struct tm.  */
 #undef TM_IN_SYS_TIME

@@ -16,6 +10,15 @@
 /* Define if you have the <glob.h> header file */
 #undef HAVE_GLOB_H

+/* Define if you have <stdint.h> */
+#undef HAVE_STDINT_H
+
+#undef HAVE_STRINGS_H
+
+#undef HAVE_STRDUP
+#undef HAVE_STRCASECMP
+#undef HAVE_STRNCASECMP
+
 #undef HAVE_WCTYPE_H

 #undef HAVE_LOCALE_H
@@ -42,4 +45,8 @@
 /* The number of bytes in a unsigned long.  */
 #undef SIZEOF_UNSIGNED_LONG

+#define PACKAGE_NAME "@PACKAGE_NAME@"
+#define PACKAGE_URL "@PACKAGE_URL@"
+
 #include "custom.h"
+
--- a/src/custom.h
+++ b/src/custom.h
@@ -166,6 +166,10 @@

 #define PASSTHRU_LEN 32

+#define MAX_RECURSION_LEVEL 1000
+
+#define MAX_FUNC_ARGS 64
+
 #define PSBEGIN "# rem2ps begin"
 #define PSEND   "# rem2ps end"

--- a/src/custom.h.in
+++ b/src/custom.h.in
@@ -166,6 +166,10 @@

 #define PASSTHRU_LEN 32

+#define MAX_RECURSION_LEVEL 1000
+
+#define MAX_FUNC_ARGS 64
+
 #define PSBEGIN "# rem2ps begin"
 #define PSEND   "# rem2ps end"

--- a/src/dorem.c
+++ b/src/dorem.c
@@ -23,9 +23,8 @@
 #include "globals.h"
 #include "err.h"
 #include "protos.h"
-#include "expr.h"

-static int ParseTimeTrig (ParsePtr s, TimeTrig *tim, int save_in_globals);
+static int ParseTimeTrig (ParsePtr s, TimeTrig *tim);
 static int ParseLocalOmit (ParsePtr s, Trigger *t);
 static int ParseScanFrom (ParsePtr s, Trigger *t, int type);
 static int ParsePriority (ParsePtr s, Trigger *t);
@@ -63,7 +62,7 @@ int DoRem(ParsePtr p)
    DBufInit(&buf);

    /* Parse the trigger date and time */
-    if ( (r=ParseRem(p, &trig, &tim, 1)) ) {
+    if ( (r=ParseRem(p, &trig, &tim)) ) {
 	FreeTrig(&trig);
 	return r;
    }
@@ -163,6 +162,7 @@ int DoRem(ParsePtr p)
 	    if (p->expr_happened) {
 		if (p->nonconst_expr) {
 		    PurgeEchoLine("%s\n", "#!P: Next line may have expired, but contains non-constant expression");
+		    PurgeEchoLine("%s\n", "#!P: or a relative SCANFROM clause");
 		    PurgeEchoLine("%s\n", CurLine);
 		} else {
 		    PurgeEchoLine("%s\n", "#!P: Next line has expired, but contains expression...  please verify");
@@ -220,7 +220,7 @@ int DoRem(ParsePtr p)
 /*  trigger structure.                                         */
 /*                                                             */
 /***************************************************************/
-int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
+int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim)
 {
    register int r;
    DynamicBuffer buf;
@@ -262,10 +262,6 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
    trig->need_wkday = 0;
    trig->adj_for_last = 0;

-    if (save_in_globals) {
-	LastTriggerTime = NO_TIME;
-    }
-
    int parsing = 1;
    while(parsing) {
 	/* Read space-delimited string */
@@ -315,10 +311,6 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
 	    trig->m = m;
 	    trig->d = d;
 	    tim->ttime = (tok.val % MINUTES_PER_DAY);
-	    if (save_in_globals) {
-		LastTriggerTime = tim->ttime;
-		SaveLastTimeTrig(tim);
-	    }
 	    break;

 	case T_WkDay:
@@ -355,14 +347,14 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
            DBufFree(&buf);
            if (tim->ttime != NO_TIME) return E_TIME_TWICE;
            tim->ttime = tok.val;
-            r = ParseTimeTrig(s, tim, save_in_globals);
+            r = ParseTimeTrig(s, tim);
            if (r) return r;
 	    trig->duration_days = ComputeTrigDuration(tim);
 	    break;

 	case T_At:
 	    DBufFree(&buf);
-	    r=ParseTimeTrig(s, tim, save_in_globals);
+	    r=ParseTimeTrig(s, tim);
 	    if (r) return r;
 	    trig->duration_days = ComputeTrigDuration(tim);
 	    break;
@@ -481,10 +473,10 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
 	    r=ParseToken(s, &buf);
 	    if (r) return r;
 	    StrnCpy(trig->omitfunc, DBufValue(&buf), VAR_NAME_LEN);
-
+            strtolower(trig->omitfunc);
 	    /* An OMITFUNC counts as a nonconst_expr! */
-	    s->expr_happened = 1;
-	    s->nonconst_expr = 1;
+            s->expr_happened = 1;
+            s->nonconst_expr = 1;
 	    DBufFree(&buf);
 	    break;

@@ -492,6 +484,7 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
 	    r=ParseToken(s, &buf);
 	    if(r) return r;
 	    StrnCpy(trig->warn, DBufValue(&buf), VAR_NAME_LEN);
+            strtolower(trig->warn);
 	    DBufFree(&buf);
 	    break;

@@ -522,9 +515,6 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
 		} else {
 		    tim->duration = NO_TIME;
 		}
-		if (save_in_globals) {
-		    SaveLastTimeTrig(tim);
-		}
 		trig->duration_days = ComputeTrigDuration(tim);
 		break;
 	    default:
@@ -536,6 +526,7 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
 	    r=ParseToken(s, &buf);
 	    if(r) return r;
 	    StrnCpy(trig->sched, DBufValue(&buf), VAR_NAME_LEN);
+            strtolower(trig->sched);
 	    DBufFree(&buf);
 	    break;

@@ -608,7 +599,7 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals)
 /*  ParseTimeTrig - parse the AT part of a timed reminder      */
 /*                                                             */
 /***************************************************************/
-static int ParseTimeTrig(ParsePtr s, TimeTrig *tim, int save_in_globals)
+static int ParseTimeTrig(ParsePtr s, TimeTrig *tim)
 {
    Token tok;
    int r;
@@ -643,11 +634,6 @@ static int ParseTimeTrig(ParsePtr s, TimeTrig *tim, int save_in_globals)
 	default:
 	    if (tim->ttime == NO_TIME) return E_EXPECT_TIME;

-	    /* Save trigger time in global variable */
-	    if (save_in_globals) {
-		LastTriggerTime = tim->ttime;
-		SaveLastTimeTrig(tim);
-	    }
 	    PushToken(DBufValue(&buf), s);
 	    DBufFree(&buf);
 	    return OK;
@@ -876,6 +862,9 @@ static int ParseScanFrom(ParsePtr s, Trigger *t, int type)
 		tok.val = -tok.val;
 	    }
 	    FromDSE(DSEToday - tok.val, &y, &m, &d);
+            /* Don't purge reminders with a relative scanfrom */
+            s->expr_happened = 1;
+            s->nonconst_expr = 1;
 	    break;

 	default:
@@ -1284,20 +1273,28 @@ int DoSatRemind(Trigger *trig, TimeTrig *tt, ParsePtr p)
 {
    int iter, dse, r, start;
    Value v;
-    char const *s;
-    char const *t;
+    expr_node *sat_node;
+    int nonconst = 0;

-    t = p->pos;
+    sat_node = ParseExpr(p, &r);
+    if (r != OK) {
+        return r;
+    }
+    if (!sat_node) {
+        return E_SWERR;
+    }
    iter = 0;
    start = trig->scanfrom;
    while (iter++ < MaxSatIter) {
 	dse = ComputeTriggerNoAdjustDuration(start, trig, tt, &r, 1, 0);
 	if (r) {
+            free_expr_tree(sat_node);
 	    if (r == E_CANT_TRIG) return OK; else return r;
 	}
 	if (dse != start && trig->duration_days) {
 	    dse = ComputeTriggerNoAdjustDuration(start, trig, tt, &r, 1, trig->duration_days);
 	    if (r) {
+                free_expr_tree(sat_node);
 		if (r == E_CANT_TRIG) return OK; else return r;
 	    }
 	} else if (dse == start) {
@@ -1310,13 +1307,18 @@ int DoSatRemind(Trigger *trig, TimeTrig *tt, ParsePtr p)
 	    SaveAllTriggerInfo(trig, tt, dse, tt->ttime, 1);
 	}
 	if (dse == -1) {
+            free_expr_tree(sat_node);
 	    return E_EXPIRED;
 	}
-	s = p->pos;
-	r = EvaluateExpr(p, &v);
-	t = p->pos;
-	if (r) return r;
-	if (v.type != INT_TYPE && v.type != STR_TYPE) return E_BAD_TYPE;
+        r = evaluate_expression(sat_node, NULL, &v, &nonconst);
+	if (r) {
+            free_expr_tree(sat_node);
+            return r;
+        }
+	if (v.type != INT_TYPE && v.type != STR_TYPE) {
+            free_expr_tree(sat_node);
+            return E_BAD_TYPE;
+        }
 	if ((v.type == INT_TYPE && v.v.val) ||
 	    (v.type == STR_TYPE && *v.v.str)) {
 	    AdjustTriggerForDuration(trig->scanfrom, dse, trig, tt, 1);
@@ -1341,17 +1343,17 @@ int DoSatRemind(Trigger *trig, TimeTrig *tt, ParsePtr p)
 		}
 		fprintf(ErrFp, "\n");
 	    }
+            free_expr_tree(sat_node);
 	    return OK;
 	}
-	p->pos = s;
 	if (dse+trig->duration_days < start) {
 	    start++;
 	} else {
 	    start = dse+trig->duration_days+1;
 	}
    }
-    p->pos = t;
    LastTrigValid = 0;
+    free_expr_tree(sat_node);
    return E_CANT_TRIG;
 }

--- a/src/dosubst.c
+++ b/src/dosubst.c
@@ -12,7 +12,7 @@
 /***************************************************************/

 #include "config.h"
-#include "expr.h"
+#include "types.h"
 #define L_IN_DOSUBST
 #include <stdio.h>
 #include <string.h>
@@ -20,7 +20,6 @@

 #include <stdlib.h>

-#include "types.h"
 #include "globals.h"
 #include "err.h"
 #include "protos.h"
@@ -242,7 +241,7 @@ int DoSubst(ParsePtr p, DynamicBuffer *dbuf, Trigger *t, TimeTrig *tt, int dse,
                    break;
                }
                if (i < 64) {
-                    *ss++ = c;
+                    *ss++ = tolower(c);
                    *ss = 0;
                    i++;
                }
@@ -269,10 +268,10 @@ int DoSubst(ParsePtr p, DynamicBuffer *dbuf, Trigger *t, TimeTrig *tt, int dse,
            continue;
        }
 	done = 0;
-        snprintf(uf, sizeof(uf), "subst_%c", c);
+        snprintf(uf, sizeof(uf), "subst_%c", tolower(c));
        if (UserFuncExists(uf) == 3) {
            snprintf(s, sizeof(s), "subst_%c(%d,'%04d-%02d-%02d',%02d:%02d)",
-                     c, altmode ? 1 : 0, y, m+1, d, h, min);
+                     tolower(c), altmode ? 1 : 0, y, m+1, d, h, min);
            expr = (char const *) s;
            r = EvalExpr(&expr, &v, NULL);
            if (r == OK) {
@@ -344,10 +343,10 @@ int DoSubst(ParsePtr p, DynamicBuffer *dbuf, Trigger *t, TimeTrig *tt, int dse,


        if (!done) {
-            snprintf(uf, sizeof(uf), "subst_%cx", c);
+            snprintf(uf, sizeof(uf), "subst_%cx", tolower(c));
            if (UserFuncExists(uf) == 3) {
                snprintf(s, sizeof(s), "subst_%cx(%d,'%04d-%02d-%02d',%02d:%02d)",
-                         c, altmode ? 1 : 0, y, m+1, d, h, min);
+                         tolower(c), altmode ? 1 : 0, y, m+1, d, h, min);
                expr = (char const *) s;
                r = EvalExpr(&expr, &v, NULL);
                if (r == OK) {
--- a/src/dynbuf.c
+++ b/src/dynbuf.c
@@ -124,7 +124,9 @@ int DBufPuts(DynamicBuffer *dbuf, char const *str)
 **********************************************************************/
 void DBufFree(DynamicBuffer *dbuf)
 {
-    if (dbuf->buffer != dbuf->staticBuf) free(dbuf->buffer);
+    if (dbuf->buffer != NULL && dbuf->buffer != dbuf->staticBuf) {
+        free(dbuf->buffer);
+    }
    DBufInit(dbuf);
 }

--- a/src/err.h
+++ b/src/err.h
@@ -122,6 +122,9 @@
 #define E_TIME_TWICE        102
 #define E_DURATION_NO_AT    103
 #define E_EXPECTING_WEEKDAY 104
+#define E_REPEATED_ARG      105
+#define E_EXPR_DISABLED     106
+#define E_TIME_EXCEEDED     107

 #ifdef MK_GLOBALS
 #undef EXTERN
@@ -140,111 +143,114 @@ EXTERN char *ErrMsg[]

 #ifdef MK_GLOBALS
 = {
-    "Ok",
-    "Missing ']'",
-    "Missing quote",
-    "Expression too complex - too many operators",
-    "Expression too complex - too many operands",
-    "Missing ')'",
-    "Undefined function",
-    "Illegal character",
-    "Expecting binary operator",
-    "Out of memory",
-    "Ill-formed number",
-    "Op stack underflow - internal error",
-    "Va stack underflow - internal error",
-    "Can't coerce",
-    "Type mismatch",
-    "Date overflow",
-    "Stack error - internal error",
-    "Division by zero",
-    "Undefined variable",
-    "Unexpected end of line",
-    "Unexpected end of file",
-    "I/O error",
-    "Line too long",
-    "Internal error",
-    "Bad date specification",
-    "Not enough arguments",
-    "Too many arguments",
-    "Ill-formed time",
-    "Number too high",
-    "Number too low",
-    "Can't open file",
-    "INCLUDE nested too deeply (max. " STR(INCLUDE_NEST) ")",
-    "Parse error",
-    "Can't compute trigger",
-    "Too many nested IFs",
-    "ELSE with no matching IF",
-    "ENDIF with no matching IF",
-    "Can't OMIT every weekday",
-    "Extraneous token(s) on line",
-    "POP-OMIT-CONTEXT without matching PUSH-OMIT-CONTEXT",
-    "RUN disabled",
-    "Domain error",
-    "Invalid identifier",
-    "Recursive function call detected",
-    "",
-    "Cannot modify system variable",
-    "C library function can't represent date/time",
-    "Attempt to redefine built-in function",
-    "Can't nest function definition in expression",
-    "Must fully specify date to use repeat factor",
-    "Year specified twice",
-    "Month specified twice",
-    "Day specified twice",
-    "Unknown token",
-    "Must specify month in OMIT command",
-    "Too many partial OMITs (max. " STR(MAX_PARTIAL_OMITS) ")",
-    "Too many full OMITs (max. " STR(MAX_FULL_OMITS) ")",
-    "Warning: PUSH-OMIT-CONTEXT without matching POP-OMIT-CONTEXT",
-    "Error reading",
-    "Expecting end-of-line",
-    "Invalid Hebrew date",
-    "IIF needs odd number of arguments",
-    "Warning: Missing ENDIF",
-    "Expecting comma",
-    "Weekday specified twice",
-    "Only use one of BEFORE, AFTER or SKIP",
-    "Can't nest MSG, MSF, RUN, etc. in expression",
-    "Repeat value specified twice",
-    "Delta value specified twice",
-    "Back value specified twice",
-    "ONCE keyword used twice. (Hah.)",
-    "Expecting time after AT",
-    "THROUGH/UNTIL keyword used twice",
-    "Incomplete date specification",
-    "FROM/SCANFROM keyword used twice",
-    "Variable",
-    "Value",
-    "*UNDEFINED*",
-    "Entering UserFN",
-    "Leaving UserFN",
-    "Expired",
-    "fork() failed - can't do queued reminders",
-    "Can't access file",
-    "Illegal system date: Year is less than %d\n",
-    "Unknown debug flag '%c'\n",
-    "Unknown option '%c'\n",
-    "Unknown user '%s'\n",
-    "Could not change gid to %d\n",
-    "Could not change uid to %d\n",
-    "Out of memory for environment\n",
-    "Missing '=' sign",
-    "Missing variable name",
-    "Missing expression",
-    "Can't reset access date of %s\n",
-    "Remind: '-i' option: %s\n",
-    "No reminders.",
-    "%d reminder(s) queued for later today.\n",
-    "Expecting number",
-    "Bad function in WARN clause",
-    "Can't convert between time zones",
-    "No files matching *.rem",
-    "String too long",
-    "Time specified twice",
-    "Cannot specify DURATION without specifying AT",
-    "Expecting weekday name"
+/* OK */                  "Ok",
+/* E_MISS_END */          "Missing ']'",
+/* E_MISS_QUOTE */        "Missing quote",
+/* E_OP_STK_OVER */       "Expression too complex",
+/* E_VA_STK_OVER */       "Expression too complex - too many operands",
+/* E_MISS_RIGHT_PAREN */  "Missing ')'",
+/* E_UNDEF_FUNC */        "Undefined function",
+/* E_ILLEGAL_CHAR */      "Illegal character",
+/* E_EXPECTING_BINOP */   "Expecting binary operator",
+/* E_NO_MEM */            "Out of memory",
+/* E_BAD_NUMBER */        "Ill-formed number",
+/* E_OP_STK_UNDER */      "Op stack underflow - internal error",
+/* E_VA_STK_UNDER */      "Va stack underflow - internal error",
+/* E_CANT_COERCE */       "Can't coerce",
+/* E_BAD_TYPE */          "Type mismatch",
+/* E_DATE_OVER */         "Date overflow",
+/* E_STACK_ERR */         "Stack error - internal error",
+/* E_DIV_ZERO */          "Division by zero",
+/* E_NOSUCH_VAR */        "Undefined variable",
+/* E_EOLN */              "Unexpected end of line",
+/* E_EOF */               "Unexpected end of file",
+/* E_IO_ERR */            "I/O error",
+/* E_LINE_2_LONG */       "Line too long",
+/* E_SWERR */             "Internal error",
+/* E_BAD_DATE */          "Bad date specification",
+/* E_2FEW_ARGS */         "Not enough arguments",
+/* E_2MANY_ARGS */        "Too many arguments",
+/* E_BAD_TIME */          "Ill-formed time",
+/* E_2HIGH */             "Number too high",
+/* E_2LOW */              "Number too low",
+/* E_CANT_OPEN */         "Can't open file",
+/* E_NESTED_INCLUDE */    "INCLUDE nested too deeply (max. " STR(INCLUDE_NEST) ")",
+/* E_PARSE_ERR */         "Parse error",
+/* E_CANT_TRIG */         "Can't compute trigger",
+/* E_NESTED_IF */         "Too many nested IFs",
+/* E_ELSE_NO_IF */        "ELSE with no matching IF",
+/* E_ENDIF_NO_IF */       "ENDIF with no matching IF",
+/* E_2MANY_LOCALOMIT */   "Can't OMIT every weekday",
+/* E_EXTRANEOUS_TOKEN */  "Extraneous token(s) on line",
+/* E_POP_NO_PUSH */       "POP-OMIT-CONTEXT without matching PUSH-OMIT-CONTEXT",
+/* E_RUN_DISABLED */      "RUN disabled",
+/* E_DOMAIN_ERR */        "Domain error",
+/* E_BAD_ID */            "Invalid identifier",
+/* E_RECURSIVE */         "Too many recursive function calls",
+/* E_PARSE_AS_REM */      "",
+/* E_CANT_MODIFY */       "Cannot modify system variable",
+/* E_MKTIME_PROBLEM */    "C library function can't represent date/time",
+/* E_REDEF_FUNC */        "Attempt to redefine built-in function",
+/* E_CANTNEST_FDEF */     "Can't nest function definition in expression",
+/* E_REP_FULSPEC */       "Must fully specify date to use repeat factor",
+/* E_YR_TWICE */          "Year specified twice",
+/* E_MON_TWICE */         "Month specified twice",
+/* E_DAY_TWICE */         "Day specified twice",
+/* E_UNKNOWN_TOKEN */     "Unknown token",
+/* E_SPEC_MON */          "Must specify month in OMIT command",
+/* E_2MANY_PART */        "Too many partial OMITs (max. " STR(MAX_PARTIAL_OMITS) ")",
+/* E_2MANY_FULL */        "Too many full OMITs (max. " STR(MAX_FULL_OMITS) ")",
+/* E_PUSH_NOPOP */        "Warning: PUSH-OMIT-CONTEXT without matching POP-OMIT-CONTEXT",
+/* E_ERR_READING */       "Error reading",
+/* E_EXPECTING_EOL */     "Expecting end-of-line",
+/* E_BAD_HEBDATE */       "Invalid Hebrew date",
+/* E_IIF_ODD */           "IIF needs odd number of arguments",
+/* E_MISS_ENDIF */        "Warning: Missing ENDIF",
+/* E_EXPECT_COMMA */      "Expecting comma",
+/* E_WD_TWICE */          "Weekday specified twice",
+/* E_SKIP_ERR */          "Only use one of BEFORE, AFTER or SKIP",
+/* E_CANT_NEST_RTYPE */   "Can't nest MSG, MSF, RUN, etc. in expression",
+/* E_REP_TWICE */         "Repeat value specified twice",
+/* E_DELTA_TWICE */       "Delta value specified twice",
+/* E_BACK_TWICE */        "Back value specified twice",
+/* E_ONCE_TWICE */        "ONCE keyword used twice. (Hah.)",
+/* E_EXPECT_TIME */       "Expecting time after AT",
+/* E_UNTIL_TWICE */       "THROUGH/UNTIL keyword used twice",
+/* E_INCOMPLETE */        "Incomplete date specification",
+/* E_SCAN_TWICE */        "FROM/SCANFROM keyword used twice",
+/* E_VAR */               "Variable",
+/* E_VAL */               "Value",
+/* E_UNDEF */             "*UNDEFINED*",
+/* E_ENTER_FUN */         "Entering UserFN",
+/* E_LEAVE_FUN */         "Leaving UserFN",
+/* E_EXPIRED */           "Expired",
+/* E_CANTFORK */          "fork() failed - can't do queued reminders",
+/* E_CANTACCESS */        "Can't access file",
+/* M_BAD_SYS_DATE */      "Illegal system date: Year is less than %d\n",
+/* M_BAD_DB_FLAG */       "Unknown debug flag '%c'\n",
+/* M_BAD_OPTION */        "Unknown option '%c'\n",
+/* M_BAD_USER */          "Unknown user '%s'\n",
+/* M_NO_CHG_GID */        "Could not change gid to %d\n",
+/* M_NO_CHG_UID */        "Could not change uid to %d\n",
+/* M_NOMEM_ENV */         "Out of memory for environment\n",
+/* E_MISS_EQ */           "Missing '=' sign",
+/* E_MISS_VAR */          "Missing variable name",
+/* E_MISS_EXPR */         "Missing expression",
+/* M_CANTSET_ACCESS */    "Can't reset access date of %s\n",
+/* M_I_OPTION */          "Remind: '-i' option: %s\n",
+/* E_NOREMINDERS */       "No reminders.",
+/* M_QUEUED */            "%d reminder(s) queued for later today.\n",
+/* E_EXPECTING_NUMBER */  "Expecting number",
+/* M_BAD_WARN_FUNC */     "Bad function in WARN clause",
+/* E_CANT_CONVERT_TZ */   "Can't convert between time zones",
+/* E_NO_MATCHING_REMS */  "No files matching *.rem",
+/* E_STRING_TOO_LONG */   "String too long",
+/* E_TIME_TWICE */        "Time specified twice",
+/* E_DURATION_NO_AT */    "Cannot specify DURATION without specifying AT",
+/* E_EXPECTING_WEEKDAY */ "Expecting weekday name",
+/* E_REPEATED_ARG */      "Duplicate argument name",
+/* E_EXPR_DISABLED */     "Expression evaluation is disabled",
+/* E_TIME_EXCEEDED */     "Time limit for expression evaluation exceeded",
 }
 #endif /* MK_GLOBALS */
 ;
--- a/src/expr.c
+++ b/src/expr.c
--- a/src/expr.h
+++ b/src/expr.h
@@ -1,67 +0,0 @@
-/***************************************************************/
-/*                                                             */
-/*  EXPR.H                                                     */
-/*                                                             */
-/*  Contains a few definitions used by expression evaluator.   */
-/*                                                             */
-/*  This file is part of REMIND.                               */
-/*  Copyright (C) 1992-2024 by Dianne Skoll                    */
-/*  SPDX-License-Identifier: GPL-2.0-only                      */
-/*                                                             */
-/***************************************************************/
-
-/* Define the types of values */
-#define ERR_TYPE       0
-#define INT_TYPE       1
-#define TIME_TYPE      2
-#define DATE_TYPE      3
-#define STR_TYPE       4
-#define DATETIME_TYPE  5
-#define SPECIAL_TYPE   6 /* Only for system variables */
-#define CONST_INT_TYPE 7 /* Only for system variables */
-
-/* Define stuff for parsing expressions */
-#define BEG_OF_EXPR '['
-#define END_OF_EXPR ']'
-#define COMMA ','
-
-#define UN_OP 0  /* Unary operator */
-#define BIN_OP 1 /* Binary Operator */
-#define FUNC 2   /* Function */
-
-/* Make the pushing and popping of values and operators in-line code
-   for speed.  BEWARE:  These macros invoke return if an error happens ! */
-
-#define PushOpStack(op) \
-    do { if (OpStackPtr >= OP_STACK_SIZE) return E_OP_STK_OVER; \
-        else { OpStack[OpStackPtr++] = (op); if (OpStackPtr > OpStackHiWater) OpStackHiWater = OpStackPtr; } } while(0)
-
-#define PopOpStack(op) \
-if (OpStackPtr <= 0) \
-return E_OP_STK_UNDER; \
-else \
-(op) = OpStack[--OpStackPtr]
-
-#define PushValStack(val) \
-do { if (ValStackPtr >= VAL_STACK_SIZE)  {   \
-    DestroyValue(val); \
-    return E_VA_STK_OVER; \
-} else { \
-    ValStack[ValStackPtr++] = (val); \
-    if (ValStackPtr > ValStackHiWater) ValStackHiWater = ValStackPtr; \
-} } while (0);
-
-#define PopValStack(val) \
-if (ValStackPtr <= 0) \
-return E_VA_STK_UNDER; \
-else \
-(val) = ValStack[--ValStackPtr]
-
-/* These functions are in utils.c and are used to detect overflow
-   in various arithmetic operators.  They have to be in separate
-   functions with extern linkage to defeat compiler optimizations
-   that would otherwise break the overflow checks. */
-extern int _private_mul_overflow(int a, int b);
-extern int _private_add_overflow(int a, int b);
-extern int _private_sub_overflow(int a, int b);
-
--- a/src/files.c
+++ b/src/files.c
@@ -79,6 +79,7 @@ typedef struct {
    int LineNo;
    unsigned int IfFlags;
    int NumIfs;
+    int IfLinenos[IF_NEST];
    long offset;
    CachedLine *CLine;
    int ownedByMe;
@@ -526,8 +527,14 @@ static int NextChainedFile(IncludeStruct *i)
 static int PopFile(void)
 {
    IncludeStruct *i;
+    int j;

-    if (!Hush && NumIfs) Eprint("%s", ErrMsg[E_MISS_ENDIF]);
+    if (!Hush && NumIfs) {
+        Eprint("%s", ErrMsg[E_MISS_ENDIF]);
+        for (j=NumIfs-1; j >=0; j--) {
+            fprintf(ErrFp, "%s(%d): IF without ENDIF\n", FileName, IfLinenos[j]);
+        }
+    }
    if (!IStackPtr) return E_EOF;
    i = &IStack[IStackPtr-1];

@@ -547,6 +554,7 @@ static int PopFile(void)

    LineNo = i->LineNo;
    IfFlags = i->IfFlags;
+    memcpy(IfLinenos, i->IfLinenos, IF_NEST);
    NumIfs = i->NumIfs;
    CLine = i->CLine;
    fp = NULL;
@@ -871,6 +879,7 @@ static int IncludeCmd(char const *cmd)
    i->LineNo = LineNo;
    i->NumIfs = NumIfs;
    i->IfFlags = IfFlags;
+    memcpy(i->IfLinenos, IfLinenos, IF_NEST);
    i->CLine = CLine;
    i->offset = -1L;
    i->chain = NULL;
@@ -973,6 +982,7 @@ int IncludeFile(char const *fname)
    i->LineNo = LineNo;
    i->NumIfs = NumIfs;
    i->IfFlags = IfFlags;
+    memcpy(i->IfLinenos, IfLinenos, IF_NEST);
    i->CLine = CLine;
    i->offset = -1L;
    i->chain = NULL;
--- a/src/funcs.c
+++ b/src/funcs.c
@@ -23,6 +23,11 @@

 #include <stdlib.h>
 #include <string.h>
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
 #include <ctype.h>
 #include <math.h>
 #include <sys/ioctl.h>
@@ -49,12 +54,13 @@
 #include "globals.h"
 #include "protos.h"
 #include "err.h"
-#include "expr.h"

 /* Defines that used to be static variables */
 #define Nargs (info->nargs)
 #define RetVal (info->retval)

+#define DBG(x) do { if (DebugFlag & DB_PRTEXPR) { x; } } while(0)
+
 static int
 solstice_equinox_for_year(int y, int which);

@@ -69,7 +75,7 @@ static int FArgs           (func_info *);
 static int FAsc            (func_info *);
 static int FBaseyr         (func_info *);
 static int FChar           (func_info *);
-static int FChoose         (func_info *);
+static int FChoose         (expr_node *, Value *, Value *, int *);
 static int FCoerce         (func_info *);
 static int FColumns        (func_info *);
 static int FCurrent        (func_info *);
@@ -96,7 +102,7 @@ static int FHebyear        (func_info *);
 static int FHour           (func_info *);
 static int FHtmlEscape     (func_info *);
 static int FHtmlStriptags  (func_info *);
-static int FIif            (func_info *);
+static int FIif            (expr_node *, Value *, Value *, int *);
 static int FIndex          (func_info *);
 static int FIsAny          (func_info *);
 static int FIsdst          (func_info *);
@@ -175,14 +181,9 @@ static int FWkday          (func_info *);
 static int FWkdaynum       (func_info *);
 static int FYear           (func_info *);

-static int CleanUpAfterFunc (func_info *);
-static int CheckArgs       (BuiltinFunc *f, int nargs);
 static int SunStuff        (int rise, double cosz, int dse);
 static int tz_set_tz       (char const *tz);

-/* "Overload" the struct Operator definition */
-#define NO_MAX 127
-
 /* Caches for extracting months, days, years from dates - may
   improve performance slightly. */
 static int CacheDse = -1;
@@ -191,14 +192,9 @@ static int CacheYear, CacheMon, CacheDay;
 static int CacheHebDse = -1;
 static int CacheHebYear, CacheHebMon, CacheHebDay;

-/* We need access to the value stack */
-extern Value ValStack[];
-extern int ValStackPtr;
-extern int ValStackHiWater;
-
 /* Macro for accessing arguments from the value stack - args are numbered
   from 0 to (Nargs - 1) */
-#define ARG(x) (ValStack[ValStackPtr - Nargs + (x)])
+#define ARG(x) (info->args[x])

 #define ARGV(x) ARG(x).v.val
 #define ARGSTR(x) ARG(x).v.str
@@ -226,215 +222,127 @@ extern int ValStackHiWater;

 /* The array holding the built-in functions. */
 BuiltinFunc Func[] = {
-/*	Name		minargs maxargs	is_constant func   */
+/*	Name		minargs maxargs	is_constant func             newfunc*/

-    {   "abs",          1,      1,      1,          FAbs },
-    {   "access",       2,      2,      0,          FAccess },
-    {   "adawn",        0,      1,      0,          FADawn},
-    {   "adusk",        0,      1,      0,          FADusk},
-    {   "ampm",         1,      3,      1,          FAmpm   },
-    {   "ansicolor",    1,      5,      1,          FAnsicolor },
-    {   "args",         1,      1,      0,          FArgs   },
-    {   "asc",          1,      1,      1,          FAsc    },
-    {   "baseyr",       0,      0,      1,          FBaseyr },
-    {   "char",         1,      NO_MAX, 1,          FChar   },
-    {   "choose",       2,      NO_MAX, 1,          FChoose },
-    {   "coerce",       2,      2,      1,          FCoerce },
-    {   "columns",      0,      1,      0,          FColumns },
-    {   "current",      0,      0,      0,          FCurrent },
-    {   "date",         3,      3,      1,          FDate   },
-    {   "datepart",     1,      1,      1,          FDatepart },
-    {   "datetime",     2,      5,      1,          FDateTime },
-    {   "dawn",         0,      1,      0,          FDawn},
-    {   "day",          1,      1,      1,          FDay    },
-    {   "daysinmon",    2,      2,      1,          FDaysinmon },
-    {   "defined",      1,      1,      0,          FDefined },
-    {   "dosubst",      1,      3,      0,          FDosubst },
-    {   "dusk",         0,      1,      0,          FDusk },
-    {   "easterdate",   0,      1,      0,          FEasterdate },
-    {   "evaltrig",     1,      2,      0,          FEvalTrig },
-    {   "filedate",     1,      1,      0,          FFiledate },
-    {   "filedatetime", 1,      1,      0,          FFiledatetime },
-    {   "filedir",      0,      0,      0,          FFiledir },
-    {   "filename",     0,      0,      0,          FFilename },
-    {   "getenv",       1,      1,      0,          FGetenv },
-    {   "hebdate",      2,      5,      0,          FHebdate },
-    {   "hebday",       1,      1,      0,          FHebday },
-    {   "hebmon",       1,      1,      0,          FHebmon },
-    {   "hebyear",      1,      1,      0,          FHebyear },
-    {   "hour",         1,      1,      1,          FHour   },
-    {   "htmlescape",   1,      1,      1,          FHtmlEscape },
-    {   "htmlstriptags",1,      1,      1,          FHtmlStriptags },
-    {   "iif",          1,      NO_MAX, 1,          FIif    },
-    {   "index",        2,      3,      1,          FIndex  },
-    {   "isany",        1,      NO_MAX, 1,          FIsAny  },
-    {   "isdst",        0,      2,      0,          FIsdst },
-    {   "isleap",       1,      1,      1,          FIsleap },
-    {   "isomitted",    1,      1,      0,          FIsomitted },
-    {   "language",     0,      0,      1,          FLanguage },
-    {   "localtoutc",   1,      1,      1,          FLocalToUTC },
-    {   "lower",        1,      1,      1,          FLower  },
-    {   "max",          1,      NO_MAX, 1,          FMax    },
-    {   "min",          1,      NO_MAX, 1,          FMin    },
-    {   "minsfromutc",  0,      2,      0,          FMinsfromutc },
-    {   "minute",       1,      1,      1,          FMinute },
-    {   "mon",          1,      1,      1,          FMon    },
-    {   "monnum",       1,      1,      1,          FMonnum },
-    {   "moondate",     1,      3,      0,          FMoondate },
-    {   "moondatetime", 1,      3,      0,          FMoondatetime },
-    {   "moonphase",    0,      2,      0,          FMoonphase },
-    {   "moontime",     1,      3,      0,          FMoontime },
-    {   "multitrig",    1,      NO_MAX, 0,          FMultiTrig },
-    {   "ndawn",        0,      1,      0,          FNDawn},
-    {   "ndusk",        0,      1,      0,          FNDusk},
-    {   "nonomitted",   2,      NO_MAX, 0,          FNonomitted },
-    {   "now",          0,      0,      0,          FNow    },
-    {   "ord",          1,      1,      1,          FOrd    },
-    {   "orthodoxeaster",0,     1,      0,          FOrthodoxeaster },
-    {   "ostype",       0,      0,      1,          FOstype },
-    {   "pad",          3,      4,      1,          FPad    },
-    {   "plural",       1,      3,      1,          FPlural },
-    {   "psmoon",       1,      4,      1,          FPsmoon},
-    {   "psshade",      1,      3,      1,          FPsshade},
-    {   "realcurrent",  0,      0,      0,          FRealCurrent},
-    {   "realnow",      0,      0,      0,          FRealnow},
-    {   "realtoday",    0,      0,      0,          FRealtoday },
-    {   "rows",         0,      0,      0,          FRows },
-    {   "sgn",          1,      1,      1,          FSgn    },
-    {   "shell",        1,      2,      0,          FShell  },
-    {   "shellescape",  1,      1,      1,          FShellescape },
-    {   "slide",        2,      NO_MAX, 0,          FSlide  },
-    {   "soleq",        1,      2,      0,          FSoleq  },
-    {   "stdout",       0,      0,      1,          FStdout },
-    {   "strlen",       1,      1,      1,          FStrlen },
-    {   "substr",       2,      3,      1,          FSubstr },
-    {   "sunrise",      0,      1,      0,          FSunrise},
-    {   "sunset",       0,      1,      0,          FSunset },
-    {   "time",         2,      2,      1,          FTime   },
-    {   "timepart",     1,      1,      1,          FTimepart },
-    {   "timezone",     0,      1,      1,          FTimezone },
-    {   "today",        0,      0,      0,          FToday  },
-    {   "trig",         0,      NO_MAX, 0,          FTrig },
-    {   "trigback",     0,      0,      0,          FTrigback },
-    {   "trigdate",     0,      0,      0,          FTrigdate },
-    {   "trigdatetime", 0,      0,      0,          FTrigdatetime },
-    {   "trigdelta",    0,      0,      0,          FTrigdelta },
-    {   "trigduration", 0,      0,      0,          FTrigduration },
-    {   "trigeventduration", 0, 0,      0,          FTrigeventduration },
-    {   "trigeventstart", 0,    0,      0,          FTrigeventstart },
-    {   "trigfrom",     0,      0,      0,          FTrigfrom },
-    {   "trigger",      1,      3,      0,          FTrigger },
-    {   "trigpriority", 0,      0,      0,          FTrigpriority },
-    {   "trigrep",      0,      0,      0,          FTrigrep },
-    {   "trigscanfrom", 0,      0,      0,          FTrigscanfrom },
-    {   "trigtags",     0,      0,      0,          FTrigtags },
-    {   "trigtime",     0,      0,      0,          FTrigtime },
-    {   "trigtimedelta",0,      0,      0,          FTrigtimedelta },
-    {   "trigtimerep",  0,      0,      0,          FTrigtimerep },
-    {   "triguntil",    0,      0,      0,          FTriguntil },
-    {   "trigvalid",    0,      0,      0,          FTrigvalid },
-    {   "typeof",       1,      1,      1,          FTypeof },
-    {   "tzconvert",    2,      3,      0,          FTzconvert },
-    {   "upper",        1,      1,      1,          FUpper  },
-    {   "utctolocal",   1,      1,      1,          FUTCToLocal },
-    {   "value",        1,      2,      0,          FValue  },
-    {   "version",      0,      0,      1,          FVersion },
-    {   "weekno",       0,      3,      1,          FWeekno },
-    {   "wkday",        1,      1,      1,          FWkday  },
-    {   "wkdaynum",     1,      1,      1,          FWkdaynum },
-    {   "year",         1,      1,      1,          FYear   }
+    {   "abs",          1,      1,      1,          FAbs, NULL },
+    {   "access",       2,      2,      0,          FAccess, NULL },
+    {   "adawn",        0,      1,      0,          FADawn, NULL},
+    {   "adusk",        0,      1,      0,          FADusk, NULL},
+    {   "ampm",         1,      3,      1,          FAmpm, NULL },
+    {   "ansicolor",    1,      5,      1,          FAnsicolor, NULL },
+    {   "args",         1,      1,      0,          FArgs, NULL },
+    {   "asc",          1,      1,      1,          FAsc, NULL },
+    {   "baseyr",       0,      0,      1,          FBaseyr, NULL },
+    {   "char",         1,      NO_MAX, 1,          FChar, NULL },
+    {   "choose",       2,      NO_MAX, 1,          NULL, FChoose }, /*NEW-STYLE*/
+    {   "coerce",       2,      2,      1,          FCoerce, NULL },
+    {   "columns",      0,      1,      0,          FColumns, NULL },
+    {   "current",      0,      0,      0,          FCurrent, NULL },
+    {   "date",         3,      3,      1,          FDate, NULL },
+    {   "datepart",     1,      1,      1,          FDatepart, NULL },
+    {   "datetime",     2,      5,      1,          FDateTime, NULL },
+    {   "dawn",         0,      1,      0,          FDawn, NULL },
+    {   "day",          1,      1,      1,          FDay, NULL },
+    {   "daysinmon",    2,      2,      1,          FDaysinmon, NULL },
+    {   "defined",      1,      1,      0,          FDefined, NULL },
+    {   "dosubst",      1,      3,      0,          FDosubst, NULL },
+    {   "dusk",         0,      1,      0,          FDusk, NULL },
+    {   "easterdate",   0,      1,      0,          FEasterdate, NULL },
+    {   "evaltrig",     1,      2,      0,          FEvalTrig, NULL },
+    {   "filedate",     1,      1,      0,          FFiledate, NULL },
+    {   "filedatetime", 1,      1,      0,          FFiledatetime, NULL },
+    {   "filedir",      0,      0,      0,          FFiledir, NULL },
+    {   "filename",     0,      0,      0,          FFilename, NULL },
+    {   "getenv",       1,      1,      0,          FGetenv, NULL },
+    {   "hebdate",      2,      5,      0,          FHebdate, NULL },
+    {   "hebday",       1,      1,      0,          FHebday, NULL },
+    {   "hebmon",       1,      1,      0,          FHebmon, NULL },
+    {   "hebyear",      1,      1,      0,          FHebyear, NULL },
+    {   "hour",         1,      1,      1,          FHour, NULL },
+    {   "htmlescape",   1,      1,      1,          FHtmlEscape, NULL },
+    {   "htmlstriptags",1,      1,      1,          FHtmlStriptags, NULL },
+    {   "iif",          1,      NO_MAX, 1,          NULL, FIif }, /*NEW-STYLE*/
+    {   "index",        2,      3,      1,          FIndex, NULL },
+    {   "isany",        1,      NO_MAX, 1,          FIsAny, NULL },
+    {   "isdst",        0,      2,      0,          FIsdst, NULL },
+    {   "isleap",       1,      1,      1,          FIsleap, NULL },
+    {   "isomitted",    1,      1,      0,          FIsomitted, NULL },
+    {   "language",     0,      0,      1,          FLanguage, NULL },
+    {   "localtoutc",   1,      1,      1,          FLocalToUTC, NULL },
+    {   "lower",        1,      1,      1,          FLower, NULL },
+    {   "max",          1,      NO_MAX, 1,          FMax, NULL },
+    {   "min",          1,      NO_MAX, 1,          FMin, NULL },
+    {   "minsfromutc",  0,      2,      0,          FMinsfromutc, NULL },
+    {   "minute",       1,      1,      1,          FMinute, NULL },
+    {   "mon",          1,      1,      1,          FMon, NULL },
+    {   "monnum",       1,      1,      1,          FMonnum, NULL },
+    {   "moondate",     1,      3,      0,          FMoondate, NULL },
+    {   "moondatetime", 1,      3,      0,          FMoondatetime, NULL },
+    {   "moonphase",    0,      2,      0,          FMoonphase, NULL },
+    {   "moontime",     1,      3,      0,          FMoontime, NULL },
+    {   "multitrig",    1,      NO_MAX, 0,          FMultiTrig, NULL },
+    {   "ndawn",        0,      1,      0,          FNDawn, NULL },
+    {   "ndusk",        0,      1,      0,          FNDusk, NULL },
+    {   "nonomitted",   2,      NO_MAX, 0,          FNonomitted, NULL },
+    {   "now",          0,      0,      0,          FNow, NULL },
+    {   "ord",          1,      1,      1,          FOrd, NULL },
+    {   "orthodoxeaster",0,     1,      0,          FOrthodoxeaster, NULL },
+    {   "ostype",       0,      0,      1,          FOstype, NULL },
+    {   "pad",          3,      4,      1,          FPad, NULL },
+    {   "plural",       1,      3,      1,          FPlural, NULL },
+    {   "psmoon",       1,      4,      1,          FPsmoon, NULL },
+    {   "psshade",      1,      3,      1,          FPsshade, NULL },
+    {   "realcurrent",  0,      0,      0,          FRealCurrent, NULL },
+    {   "realnow",      0,      0,      0,          FRealnow, NULL },
+    {   "realtoday",    0,      0,      0,          FRealtoday, NULL },
+    {   "rows",         0,      0,      0,          FRows, NULL },
+    {   "sgn",          1,      1,      1,          FSgn, NULL },
+    {   "shell",        1,      2,      0,          FShell, NULL },
+    {   "shellescape",  1,      1,      1,          FShellescape, NULL },
+    {   "slide",        2,      NO_MAX, 0,          FSlide, NULL },
+    {   "soleq",        1,      2,      0,          FSoleq, NULL },
+    {   "stdout",       0,      0,      1,          FStdout, NULL },
+    {   "strlen",       1,      1,      1,          FStrlen, NULL },
+    {   "substr",       2,      3,      1,          FSubstr, NULL },
+    {   "sunrise",      0,      1,      0,          FSunrise, NULL },
+    {   "sunset",       0,      1,      0,          FSunset, NULL },
+    {   "time",         2,      2,      1,          FTime, NULL },
+    {   "timepart",     1,      1,      1,          FTimepart, NULL },
+    {   "timezone",     0,      1,      1,          FTimezone, NULL },
+    {   "today",        0,      0,      0,          FToday, NULL },
+    {   "trig",         0,      NO_MAX, 0,          FTrig, NULL },
+    {   "trigback",     0,      0,      0,          FTrigback, NULL },
+    {   "trigdate",     0,      0,      0,          FTrigdate, NULL },
+    {   "trigdatetime", 0,      0,      0,          FTrigdatetime, NULL },
+    {   "trigdelta",    0,      0,      0,          FTrigdelta, NULL },
+    {   "trigduration", 0,      0,      0,          FTrigduration, NULL },
+    {   "trigeventduration", 0, 0,      0,          FTrigeventduration, NULL },
+    {   "trigeventstart", 0,    0,      0,          FTrigeventstart, NULL },
+    {   "trigfrom",     0,      0,      0,          FTrigfrom, NULL },
+    {   "trigger",      1,      3,      0,          FTrigger, NULL },
+    {   "trigpriority", 0,      0,      0,          FTrigpriority, NULL },
+    {   "trigrep",      0,      0,      0,          FTrigrep, NULL },
+    {   "trigscanfrom", 0,      0,      0,          FTrigscanfrom, NULL },
+    {   "trigtags",     0,      0,      0,          FTrigtags, NULL },
+    {   "trigtime",     0,      0,      0,          FTrigtime, NULL },
+    {   "trigtimedelta",0,      0,      0,          FTrigtimedelta, NULL },
+    {   "trigtimerep",  0,      0,      0,          FTrigtimerep, NULL },
+    {   "triguntil",    0,      0,      0,          FTriguntil, NULL },
+    {   "trigvalid",    0,      0,      0,          FTrigvalid, NULL },
+    {   "typeof",       1,      1,      1,          FTypeof, NULL },
+    {   "tzconvert",    2,      3,      0,          FTzconvert, NULL },
+    {   "upper",        1,      1,      1,          FUpper, NULL },
+    {   "utctolocal",   1,      1,      1,          FUTCToLocal, NULL },
+    {   "value",        1,      2,      0,          FValue, NULL },
+    {   "version",      0,      0,      1,          FVersion, NULL },
+    {   "weekno",       0,      3,      1,          FWeekno, NULL },
+    {   "wkday",        1,      1,      1,          FWkday, NULL },
+    {   "wkdaynum",     1,      1,      1,          FWkdaynum, NULL },
+    {   "year",         1,      1,      1,          FYear, NULL }
 };

 /* Need a variable here - Func[] array not really visible to outside. */
-int NumFuncs = sizeof(Func) / sizeof(Operator) ;
-
-/***************************************************************/
-/*                                                             */
-/*  CallFunc                                                   */
-/*                                                             */
-/*  Call a function given a pointer to it, and the number      */
-/*  of arguments supplied.                                     */
-/*                                                             */
-/***************************************************************/
-int CallFunc(BuiltinFunc *f, int nargs)
-{
-    register int r = CheckArgs(f, nargs);
-    int i;
-
-    func_info info_obj;
-    func_info *info = &info_obj;
-
-    Nargs = nargs;
-    RetVal.type = ERR_TYPE;
-
-    if (DebugFlag & DB_PRTEXPR) {
-	fprintf(ErrFp, "%s(", f->name);
-	for (i=0; i<nargs; i++) {
-	    PrintValue(&ARG(i), ErrFp);
-	    if (i<nargs-1) fprintf(ErrFp, ", ");
-	}
-	fprintf(ErrFp, ") => ");
-	if (r) {
-	    fprintf(ErrFp, "%s\n", ErrMsg[r]);
-	    return r;
-	}
-    }
-    if (r) {
-	Eprint("%s(): %s", f->name, ErrMsg[r]);
-	return r;
-    }
-
-    r = (*(f->func))(info);
-    if (r) {
-	DestroyValue(RetVal);
-	if (DebugFlag & DB_PRTEXPR)
-	    fprintf(ErrFp, "%s\n", ErrMsg[r]);
-	else
-	    Eprint("%s(): %s", f->name, ErrMsg[r]);
-	return r;
-    }
-    if (DebugFlag & DB_PRTEXPR) {
-	PrintValue(&RetVal, ErrFp);
-	fprintf(ErrFp, "\n");
-    }
-    r = CleanUpAfterFunc(info);
-    return r;
-}
-
-/***************************************************************/
-/*                                                             */
-/*  CheckArgs                                                  */
-/*                                                             */
-/*  Check that the right number of args have been supplied     */
-/*  for a function.                                            */
-/*                                                             */
-/***************************************************************/
-static int CheckArgs(BuiltinFunc *f, int nargs)
-{
-    if (nargs < f->minargs) return E_2FEW_ARGS;
-    if (nargs > f->maxargs && f->maxargs != NO_MAX) return E_2MANY_ARGS;
-    return OK;
-}
-/***************************************************************/
-/*                                                             */
-/*  CleanUpAfterFunc                                           */
-/*                                                             */
-/*  Clean up the stack after a function call - remove          */
-/*  args and push the new value.                               */
-/*                                                             */
-/***************************************************************/
-static int CleanUpAfterFunc(func_info *info)
-{
-    Value v;
-    int i;
-
-    for (i=0; i<Nargs; i++) {
-	PopValStack(v);
-	DestroyValue(v);
-    }
-    PushValStack(RetVal);
-    return OK;
-}
+int NumFuncs = sizeof(Func) / sizeof(BuiltinFunc) ;

 /***************************************************************/
 /*                                                             */
@@ -1108,8 +1016,11 @@ static int FOrd(func_info *info)
    ASSERT_TYPE(0, INT_TYPE);

    v = ARGV(0);
-    t = v % 100;
-    if (t < 0) t = -t;
+    if (v < 0) {
+        t = (-v) % 100;
+    } else {
+        t = v % 100;
+    }
    u = t % 10;
    s = "th";
    if (u == 1 && t != 11) s = "st";
@@ -1271,6 +1182,9 @@ static int FIsAny(func_info *info)
    return OK;
 }

+/* Debugging helpers for "choose()" and "iif() */
+#define PUT(x) DBufPuts(&DebugBuf, x)
+#define OUT() do { fprintf(ErrFp, "%s\n", DBufValue(&DebugBuf)); DBufFree(&DebugBuf); } while(0)
 /***************************************************************/
 /*                                                             */
 /*  FChoose                                                    */
@@ -1279,15 +1193,63 @@ static int FIsAny(func_info *info)
 /*  from 1.                                                    */
 /*                                                             */
 /***************************************************************/
-static int FChoose(func_info *info)
+static int FChoose(expr_node *node, Value *locals, Value *ans, int *nonconst)
 {
-    int v;
+    DynamicBuffer DebugBuf;
+    expr_node *cur;
+    int r;
+    int n;
+    int nargs = node->num_kids;
+    Value(v);
+    DBG(DBufInit(&DebugBuf));
+    DBG(PUT("choose("));

-    ASSERT_TYPE(0, INT_TYPE);
-    v = ARGV(0);
-    if (v < 1) v = 1;
-    if (v > Nargs-1) v = Nargs-1;
-    DCOPYVAL(RetVal, ARG(v));
+    cur = node->child;
+    r = evaluate_expr_node(cur, locals, &v, nonconst);
+    if (r != OK) {
+        DBG(DBufFree(&DebugBuf));
+        return r;
+    }
+    DBG(PUT(PrintValue(&v, NULL)));
+    if (v.type != INT_TYPE) {
+        if (DebugFlag & DB_PRTEXPR) {
+            cur = cur->sibling;
+            while(cur) {
+                PUT(", ?");
+                cur = cur->sibling;
+            }
+            PUT(") => ");
+            PUT(ErrMsg[E_BAD_TYPE]);
+            OUT();
+        }
+        return E_BAD_TYPE;
+    }
+    n = v.v.val;
+    if (n < 1) n = 1;
+    if (n > nargs-1) n = nargs-1;
+
+    while(n--) {
+        cur = cur->sibling;
+        DBG(if (n) { PUT(", ?"); });
+        if (!cur) return E_SWERR; /* Should not happen! */
+    }
+    r = evaluate_expr_node(cur, locals, ans, nonconst);
+    if (r != OK) {
+        DBG(DBufFree(&DebugBuf));
+        return r;
+    }
+    if (DebugFlag & DB_PRTEXPR) {
+        PUT(", ");
+        PUT(PrintValue(ans, NULL));
+        cur = cur->sibling;
+        while(cur) {
+            PUT(", ?");
+            cur = cur->sibling;
+        }
+        PUT(") => ");
+        PUT(PrintValue(ans, NULL));
+        OUT();
+    }
    return OK;
 }

@@ -1473,7 +1435,7 @@ static int FValue(func_info *info)
    ASSERT_TYPE(0, STR_TYPE);
    switch(Nargs) {
    case 1:
-	return GetVarValue(ARGSTR(0), &RetVal, NULL, NULL);
+	return GetVarValue(ARGSTR(0), &RetVal);

    case 2:
 	v = FindVar(ARGSTR(0), 0);
@@ -1945,33 +1907,101 @@ static int FIndex(func_info *info)
 /*                                                             */
 /*  FIif                                                       */
 /*                                                             */
-/*  The IIF function.                                          */
+/*  The IIF function.  Uses new-style evaluation               */
 /*                                                             */
 /***************************************************************/
-static int FIif(func_info *info)
+static int FIif(expr_node *node, Value *locals, Value *ans, int *nonconst)
 {
    int istrue;
-    int arg;
+    int r;
+    int done;
+    Value v;
+    expr_node *cur;
+    DynamicBuffer DebugBuf;

-    if (!(Nargs % 2)) return E_IIF_ODD;
+    DBG(DBufInit(&DebugBuf));
+    DBG(PUT("iif("));
+    cur = node->child;

-    for (arg=0; arg<Nargs-1; arg += 2) {
-	if (ARG(arg).type != STR_TYPE && ARG(arg).type != INT_TYPE)
-	    return E_BAD_TYPE;
-
-	if (ARG(arg).type == INT_TYPE)
-	    istrue = ARG(arg).v.val;
-	else
-	    istrue = *(ARG(arg).v.str);
-
-	if (istrue) {
-	    DCOPYVAL(RetVal, ARG(arg+1));
-	    return OK;
-	}
+    if (!(node->num_kids % 2)) {
+        if (DebugFlag & DB_PRTEXPR) {
+            r = 0;
+            while(cur) {
+                if (r) PUT(", ");
+                r=1;
+                PUT("?");
+                cur = cur->sibling;
+            }
+            PUT(") => ");
+            PUT(ErrMsg[E_IIF_ODD]);
+            OUT();
+        }
+        return E_IIF_ODD;
    }

-    DCOPYVAL(RetVal, ARG(Nargs-1));
-    return OK;
+
+    done = 0;
+    while(cur->sibling) {
+        r = evaluate_expr_node(cur, locals, &v, nonconst);
+        if (r != OK) {
+            DBG(DBufFree(&DebugBuf));
+            return r;
+        }
+        if (DebugFlag & DB_PRTEXPR) {
+            if (done) PUT(", ");
+            done = 1;
+            PUT(PrintValue(&v, NULL));
+        }
+	if (v.type != STR_TYPE && v.type != INT_TYPE) {
+            if (DebugFlag & DB_PRTEXPR) {
+                cur = cur->sibling;
+                while(cur) {
+                    PUT(", ?");
+                    cur = cur->sibling;
+                }
+                PUT(") => ");
+                PUT(ErrMsg[E_BAD_TYPE]);
+                OUT();
+            }
+	    return E_BAD_TYPE;
+        }
+
+	if (v.type == INT_TYPE) {
+	    istrue = v.v.val;
+        } else {
+	    istrue = *(v.v.str);
+        }
+	if (istrue) {
+            r = evaluate_expr_node(cur->sibling, locals, ans, nonconst);
+            if (r == OK && (DebugFlag & DB_PRTEXPR)) {
+                PUT(", ");
+                PUT(PrintValue(ans, NULL));
+                cur = cur->sibling->sibling;
+                while(cur) {
+                    PUT(", ?");
+                    cur = cur->sibling;
+                }
+                PUT(") => ");
+                PUT(PrintValue(ans, NULL));
+                OUT();
+            }
+            DBG(DBufFree(&DebugBuf));
+            return r;
+	}
+        DBG(PUT(", ?"));
+        cur = cur->sibling->sibling;
+    }
+
+    /* Return the last arg */
+    r = evaluate_expr_node(cur, locals, ans, nonconst);
+    if (DebugFlag & DB_PRTEXPR) {
+        if (done) PUT(", ");
+        PUT(PrintValue(ans, NULL));
+        PUT(") => ");
+        PUT(PrintValue(ans, NULL));
+        OUT();
+    }
+    return r;
 }

 /***************************************************************/
@@ -2093,6 +2123,7 @@ static int FArgs(func_info *info)
 {
    ASSERT_TYPE(0, STR_TYPE);
    RetVal.type = INT_TYPE;
+    strtolower(ARGSTR(0));
    RETVAL = UserFuncExists(ARGSTR(0));
    return OK;
 }
@@ -2365,14 +2396,18 @@ static int FEasterdate(func_info *info)
 {
    int y, m, d;
    int g, c, x, z, e, n;
+    int base;
    if (Nargs == 0) {
+        base = DSEToday;
        FromDSE(DSEToday, &y, &m, &d);
    } else {
        if (ARG(0).type == INT_TYPE) {
+            base = -1;
            y = ARGV(0);
            if (y < BASE) return E_2LOW;
            else if (y > BASE+YR_RANGE) return E_2HIGH;
        } else if (HASDATE(ARG(0))) {
+            base = DATEPART(ARG(0));
            FromDSE(DATEPART(ARG(0)), &y, &m, &d);  /* We just want the year */
        } else return E_BAD_TYPE;
    }
@@ -2398,7 +2433,7 @@ static int FEasterdate(func_info *info)

 	RetVal.type = DATE_TYPE;
 	RETVAL = DSE(y, m, d);
-	y++; } while (HASDATE(ARG(0)) && RETVAL < DATEPART(ARG(0)));
+	y++; } while (base > -1 && RETVAL < base);

    return OK;
 }
@@ -2414,7 +2449,9 @@ static int FOrthodoxeaster(func_info *info)
 {
    int y, m, d;
    int a, b, c, dd, e, f, dse;
+    int base = -1;
    if (Nargs == 0) {
+        base = DSEToday;
        FromDSE(DSEToday, &y, &m, &d);
    } else {
        if (ARG(0).type == INT_TYPE) {
@@ -2422,6 +2459,7 @@ static int FOrthodoxeaster(func_info *info)
            if (y < BASE) return E_2LOW;
            else if (y > BASE+YR_RANGE) return E_2HIGH;
        } else if (HASDATE(ARG(0))) {
+            base = DATEPART(ARG(0));
            FromDSE(DATEPART(ARG(0)), &y, &m, &d);  /* We just want the year */
        } else return E_BAD_TYPE;
    }
@@ -2441,7 +2479,7 @@ static int FOrthodoxeaster(func_info *info)
 	RetVal.type = DATE_TYPE;
 	RETVAL = dse;
 	y++;
-    } while (HASDATE(ARG(0)) && RETVAL < DATEPART(ARG(0)));
+    } while (base > -1 && RETVAL < base);

    return OK;
 }
@@ -3498,7 +3536,7 @@ FEvalTrig(func_info *info)

    CreateParser(ARGSTR(0), &p);
    p.allownested = 0;
-    r = ParseRem(&p, &trig, &tim, 0);
+    r = ParseRem(&p, &trig, &tim);
    if (r) {
        DestroyParser(&p);
        return r;
@@ -3557,7 +3595,7 @@ FMultiTrig(func_info *info)
    for (i=0; i<Nargs; i++) {
        CreateParser(ARGSTR(i), &p);
        p.allownested = 0;
-        r = ParseRem(&p, &trig, &tim, 0);
+        r = ParseRem(&p, &trig, &tim);
        if (r) {
            DestroyParser(&p);
            return r;
@@ -3614,7 +3652,7 @@ FTrig(func_info *info)
    for (i=0; i<Nargs; i++) {
        CreateParser(ARGSTR(i), &p);
        p.allownested = 0;
-        r = ParseRem(&p, &trig, &tim, 0);
+        r = ParseRem(&p, &trig, &tim);
        if (r) {
            DestroyParser(&p);
            return r;
@@ -3888,3 +3926,38 @@ FSoleq(func_info *info)
    RETVAL = ret;
    return OK;
 }
+
+/* Compare two strings case-insensitively, where we KNOW
+   that the second string is definitely lower-case */
+static int strcmp_lcfirst(char const *s1, char const *s2)
+{
+    int r;
+    while (*s1 && *s2) {
+	r = tolower(*s1) - *s2;
+	if (r) return r;
+	s1++;
+	s2++;
+    }
+    return tolower(*s1) - *s2;
+}
+
+/***************************************************************/
+/*                                                             */
+/*  FindBuiltinFunc                                            */
+/*                                                             */
+/*  Find a built-in function.                                  */
+/*                                                             */
+/***************************************************************/
+BuiltinFunc *FindBuiltinFunc(char const *name)
+{
+    int top=NumFuncs-1, bot=0;
+    int mid, r;
+    while (top >= bot) {
+	mid = (top + bot) / 2;
+	r = strcmp_lcfirst(name, Func[mid].name);
+	if (!r) return &Func[mid];
+	else if (r > 0) bot = mid+1;
+	else top = mid-1;
+    }
+    return NULL;
+}
--- a/src/globals.h
+++ b/src/globals.h
@@ -23,6 +23,7 @@
 #define INIT(var, val) var
 #endif

+#include <signal.h>
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
@@ -73,6 +74,9 @@ EXTERN  INIT(	int 	InfiniteDelta, 0);
 EXTERN  INIT(   int     DefaultTDelta, 0);
 EXTERN  INIT(   int     DeltaOverride, 0);
 EXTERN  INIT(   int     RunDisabled, 0);
+EXTERN  INIT(   int     ExpressionEvaluationDisabled, 0);
+EXTERN  INIT(   int     ExpressionEvaluationTimeLimit, 0);
+EXTERN  INIT(   volatile sig_atomic_t ExpressionTimeLimitExceeded, 0);
 EXTERN  INIT(   int     IgnoreOnce, 0);
 EXTERN  INIT(   int     SortByTime, 0);
 EXTERN  INIT(   int     SortByDate, 0);
@@ -110,11 +114,12 @@ EXTERN  INIT(   int     PurgeIncludeDepth, 0);
 EXTERN  INIT(   FILE    *PurgeFP,  NULL);
 EXTERN  INIT(   int     NumIfs,    0);
 EXTERN  INIT(   unsigned int IfFlags,   0);
+EXTERN  INIT(   int IfLinenos[IF_NEST], {0});
 EXTERN  INIT(   int     LastTrigValid, 0);
 EXTERN  Trigger  LastTrigger;
 EXTERN  TimeTrig LastTimeTrig;
 EXTERN  INIT(   int     LastTriggerDate, 0);
-EXTERN  INIT(   int     LastTriggerTime, 0);
+EXTERN  INIT(   int     LastTriggerTime, NO_TIME);
 EXTERN  INIT(   int     ShouldCache, 0);
 EXTERN  char const   *CurLine;
 EXTERN  INIT(   int     NumTriggered, 0);
@@ -159,6 +164,9 @@ EXTERN DynamicBuffer Banner;
 EXTERN DynamicBuffer LineBuffer;
 EXTERN DynamicBuffer ExprBuf;

+/* User-func recursion level */
+EXTERN  INIT(   unsigned int FuncRecursionLevel, 0);
+
 extern int NumFullOmits, NumPartialOmits;

 /* List of months */
--- a/src/hbcal.c
+++ b/src/hbcal.c
@@ -20,6 +20,12 @@
 #include "protos.h"
 #include "globals.h"
 #include "err.h"
+#include <string.h>
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
 #define HOUR 1080L
 #define DAY  (24L*HOUR)
 #define WEEK (7L*DAY)
--- a/src/init.c
+++ b/src/init.c
@@ -19,7 +19,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <ctype.h>
-
+#include <time.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -38,7 +38,6 @@
 #include "types.h"
 #include "globals.h"
 #include "protos.h"
-#include "expr.h"
 #include "err.h"

 static int should_guess_terminal_background = 1;
@@ -605,7 +604,7 @@ void InitRemind(int argc, char const *argv[])
 	    case 'D':
 		while (*arg) {
 		    switch(*arg++) {
-                    case 's': case 'S': DebugFlag |= DB_EXPR_STACKS; break;
+                    case 's': case 'S': DebugFlag |= DB_PARSE_EXPR;  break;
 		    case 'e': case 'E': DebugFlag |= DB_ECHO_LINE;   break;
 		    case 'x': case 'X': DebugFlag |= DB_PRTEXPR;     break;
 		    case 't': case 'T': DebugFlag |= DB_PRTTRIG;     break;
@@ -806,6 +805,7 @@ void Usage(void)
    fprintf(ErrFp, " -m     Start calendar with Monday rather than Sunday\n");
    fprintf(ErrFp, " -y     Synthesize tags for tagless reminders\n");
    fprintf(ErrFp, " -j[n]  Run in 'purge' mode.  [n = INCLUDE depth]\n");
+    fprintf(ErrFp, "\nRemind home page: %s\n", PACKAGE_URL);
    exit(EXIT_FAILURE);
 }
 #endif /* L_USAGE_OVERRIDE */
@@ -925,7 +925,12 @@ static void InitializeVar(char const *str)
    r = 0;
    while (*str && *str != '=') {
 	if (r < VAR_NAME_LEN) {
-	    varname[r++] = *str;
+            if (isalpha(*str) || *str == '_' || (r > 0 && *str == '(') || (r == 0 && *str == '$') || (r > 0 && isdigit(*str))) {
+                varname[r++] = *str;
+            } else {
+                fprintf(ErrFp, ErrMsg[M_I_OPTION], ErrMsg[E_ILLEGAL_CHAR]);
+                return;
+            }
 	}
 	if (*str == '(') {
 	    /* Do a function definition if we see a paren */
@@ -935,10 +940,28 @@ static void InitializeVar(char const *str)
 	str++;
    }
    varname[r] = 0;
-    if (!*str) {
-	fprintf(ErrFp, ErrMsg[M_I_OPTION], ErrMsg[E_MISS_EQ]);
+    if (!*varname) {
+	fprintf(ErrFp, ErrMsg[M_I_OPTION], ErrMsg[E_MISS_VAR]);
 	return;
    }
+    if (!*str) {
+        /* Setting a system var does require =expr on the commandline */
+        if (*varname == '$') {
+            fprintf(ErrFp, ErrMsg[M_I_OPTION], ErrMsg[E_MISS_EQ]);
+            return;
+        }
+        val.type = INT_TYPE;
+        val.v.val = 0;
+        r = SetVar(varname, &val);
+        if (!r) {
+            r = PreserveVar(varname);
+        }
+        if (r) {
+            fprintf(ErrFp, ErrMsg[M_I_OPTION], ErrMsg[r]);
+        }
+        return;
+    }
+
    if (!*varname) {
 	fprintf(ErrFp, ErrMsg[M_I_OPTION], ErrMsg[E_MISS_VAR]);
 	return;
@@ -991,13 +1014,65 @@ AddTrustedUser(char const *username)
    NumTrustedUsers++;
 }

+static pid_t LimiterPid = (pid_t) -1;
+
+void unlimit_execution_time(void)
+{
+    if (LimiterPid != (pid_t) -1) {
+        kill(LimiterPid, SIGTERM);
+        LimiterPid = (pid_t) -1;
+    }
+}
+
+static void limit_execution_time(int t)
+{
+    pid_t parent = getpid();
+
+    pid_t pid = fork();
+    if (pid < 0) {
+        perror("fork");
+        exit(1);
+    }
+
+    if (pid > 0) {
+        LimiterPid = pid;
+        /* In the parent */
+        return;
+    }
+
+    /* In the child */
+    time_t start = time(NULL);
+    while(1) {
+        sleep(1);
+        if (kill(parent, 0) < 0) {
+            /* Parent has probably exited */
+            exit(0);
+        }
+        if (time(NULL) - start > t) {
+            kill(parent, SIGXCPU);
+            exit(0);
+        }
+    }
+}
+
 static void
 ProcessLongOption(char const *arg)
 {
+    int t;
    if (!strcmp(arg, "version")) {
        printf("%s\n", VERSION);
        exit(EXIT_SUCCESS);
    }
+    if (sscanf(arg, "max-execution-time=%d", &t) == 1) {
+        if (t < 0) {
+            fprintf(ErrFp, "%s: --max-execution-time must be non-negative\n", ArgV[0]);
+            return;
+        }
+        if (t > 0) {
+            limit_execution_time(t);
+        }
+        return;
+    }
    fprintf(ErrFp, "%s: Unknown long option --%s\n", ArgV[0], arg);
 }

--- a/src/langs/finnish.h
+++ b/src/langs/finnish.h
@@ -145,7 +145,7 @@ EXTERN char *ErrMsg[] =
    "Ok",
    "Puuttuva ']'",
    "Puuttuva lainausmerkki",
-    "Liian monimutkainen lauseke - liikaa operaattoreita",
+    "Liian monimutkainen lauseke",
    "Liian monimutkainen lauseke - liikaa operandeja",
    "Puuttuva ')'",
    "Määrittelemätön funktio",
@@ -246,7 +246,10 @@ EXTERN char *ErrMsg[] =
    "String too long",
    "Time specified twice",
    "Cannot specify DURATION without specifying AT",
-    "Odotettu viikonpäivän nimi"
+    "Odotettu viikonpäivän nimi",
+    "Päällekkäinen argumentin nimi",
+    "Lausekkeiden arviointi on poistettu käytöstä",
+
 };
 #endif /* MK_GLOBALS */

--- a/src/langs/french.h
+++ b/src/langs/french.h
@@ -119,7 +119,7 @@ EXTERN char *ErrMsg[] =
    "Ok",
    "']' manquant",
    "Apostrophe manquant",
-    "Expression trop complexe - trop d'opérateurs",
+    "Expression trop complexe",
    "Expression trop complexe - trop d'opérandes",
    "')' manquante",
    "Fonction non-définie",
@@ -221,6 +221,9 @@ EXTERN char *ErrMsg[] =
    "Time specified twice",
    "Cannot specify DURATION without specifying AT",
    "Nom du jour de la semaine attendu",
+    "Nom de l'argument en double",
+    "L'évaluation de l'expression est désactivée",
+
 };
 #endif /* MK_GLOBALS */

--- a/src/langs/polish.h
+++ b/src/langs/polish.h
@@ -135,7 +135,7 @@ EXTERN char *ErrMsg[] =
    "OK",
    "Brakujący ']'",
    "Brakujący nawias",
-    "Zbyt skomplikowane wyrażenie - za dużo operatorów",
+    "Zbyt skomplikowane wyrażenie",
    "Zbyt skomplikowane wyrażenie - za dużo argumentów",
    "Brakujący ')'",
    "Nie zdefiniowana funkcja",
@@ -236,7 +236,9 @@ EXTERN char *ErrMsg[] =
    "String too long",
    "Time specified twice",
    "Cannot specify DURATION without specifying AT",
-    "Oczekiwana nazwa dnia tygodnia"
+    "Oczekiwana nazwa dnia tygodnia",
+    "Zduplikowana nazwa argumentu",
+    "Ocena wyrażeń jest wyłączona",
 };
 #endif /* MK_GLOBALS */

--- a/src/langs/portbr.h
+++ b/src/langs/portbr.h
@@ -144,7 +144,7 @@ EXTERN char *ErrMsg[] =
    "Ok",
    "Falta um ']'",
    "Falta uma aspa",
-    "Expressao muito complexa - muitos operadores",
+    "Expressao muito complexa",
    "Expressao muito complexa - muitos operandos",
    "Falta um ')'",
    "Funcao nao definida",
@@ -246,6 +246,8 @@ EXTERN char *ErrMsg[] =
    "Time specified twice",
    "Cannot specify DURATION without specifying AT",
    "Esperando nome do dia da semana",
+    "Nome de argumento duplicado",
+    "A avaliação da expressão está desabilitada",
 };
 #endif /* MK_GLOBALS */

--- a/src/main.c
+++ b/src/main.c
@@ -22,6 +22,11 @@
 #include <stdio.h>
 #include <signal.h>
 #include <string.h>
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
 #include <stdarg.h>
 #ifdef HAVE_LOCALE_H
 #include <locale.h>
@@ -41,7 +46,6 @@

 #include "types.h"
 #include "protos.h"
-#include "expr.h"
 #include "globals.h"
 #include "err.h"

@@ -50,6 +54,33 @@ static void DoReminders(void);
 /* Macro for simplifying common block so as not to litter code */
 #define OUTPUT(c) do { if (output) { DBufPutc(output, c); } else { putchar(c); } } while(0)

+void
+exitfunc(void)
+{
+    /* Kill any execution-time-limiter process */
+    unlimit_execution_time();
+
+    if (DebugFlag & DB_PARSE_EXPR) {
+        fflush(stdout);
+        fflush(stderr);
+        UnsetAllUserFuncs();
+        print_expr_nodes_stats();
+    }
+}
+
+static void sigalrm(int)
+{
+    if (ExpressionEvaluationTimeLimit) {
+        ExpressionTimeLimitExceeded = 1;
+    }
+}
+
+static void sigxcpu(int)
+{
+    write(STDERR_FILENO, "\n\nmax-execution-time exceeded.\n\n", 32);
+    _exit(1);
+}
+
 /***************************************************************/
 /***************************************************************/
 /**                                                           **/
@@ -61,6 +92,8 @@ int main(int argc, char *argv[])
 {
    int pid;

+    struct sigaction act;
+
 #ifdef HAVE_SETLOCALE
    setlocale(LC_ALL, "");
 #endif
@@ -73,10 +106,29 @@ int main(int argc, char *argv[])
    ArgV = (char const **) argv;

    InitRemind(argc, (char const **) argv);
+
+    act.sa_handler = sigalrm;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_RESTART;
+    if (sigaction(SIGALRM, &act, NULL) < 0) {
+        fprintf(stderr, "%s: sigaction() failed: %s\n",
+                argv[0], strerror(errno));
+        exit(1);
+    }
+
+    act.sa_handler = sigxcpu;
+    act.sa_flags = SA_RESTART;
+    sigemptyset(&act.sa_mask);
+    if (sigaction(SIGXCPU, &act, NULL) < 0) {
+        fprintf(stderr, "%s: sigaction() failed: %s\n",
+                argv[0], strerror(errno));
+        exit(1);
+    }
+
    DBufInit(&(LastTrigger.tags));
    ClearLastTriggers();

-    atexit(DebugExitFunc);
+    atexit(exitfunc);

    if (DoCalendar || (DoSimpleCalendar && (!NextMode || PsCal))) {
 	ProduceCalendar();
@@ -101,7 +153,7 @@ int main(int argc, char *argv[])
 	}

 	if (!Hush) {
-	    if (DestroyOmitContexts())
+	    if (DestroyOmitContexts(1))
 		Eprint("%s", ErrMsg[E_PUSH_NOPOP]);
 	    if (!Daemon && !NextMode && !NumTriggered && !NumQueued) {
 		printf("%s\n", ErrMsg[E_NOREMINDERS]);
@@ -154,7 +206,7 @@ void
 PerIterationInit(void)
 {
    ClearGlobalOmits();
-    DestroyOmitContexts();
+    DestroyOmitContexts(1);
    DestroyVars(0);
    DefaultColorR = -1;
    DefaultColorG = -1;
@@ -281,9 +333,11 @@ static void DoReminders(void)
 	    case T_Pop:     r=PopOmitContext(&p);     break;
 	    case T_Preserve: r=DoPreserve(&p);  break;
 	    case T_Push:    r=PushOmitContext(&p);    break;
+            case T_Expr: r = DoExpr(&p); break;
 	    case T_RemType: if (tok.val == RUN_TYPE) {
 		    r=DoRun(&p);
 		} else {
+		    DestroyParser(&p);
 		    CreateParser(CurLine, &p);
 		    r=DoRem(&p);
 		    purge_handled = 1;
@@ -292,10 +346,8 @@ static void DoReminders(void)


 	    /* If we don't recognize the command, do a REM by default */
-	    /* Note:  Since the parser hasn't been used yet, we don't */
-	    /* need to destroy it here. */

-	    default: CreateParser(CurLine, &p); purge_handled = 1; r=DoRem(&p); break;
+	    default: DestroyParser(&p); CreateParser(CurLine, &p); purge_handled = 1; r=DoRem(&p); break;

 	    }
 	    if (r && (!Hush || r != E_RUN_DISABLED)) {
@@ -453,6 +505,16 @@ int ParseChar(ParsePtr p, int *err, int peek)
 		return *(p->pos++);
 	    }
 	}
+
+        /* Convert [[ to just a literal [ */
+        if (*p->pos == BEG_OF_EXPR && *(p->pos+1) == BEG_OF_EXPR) {
+	    if (peek) {
+		return *(p->pos+1);
+	    } else {
+                p->pos++;
+		return *(p->pos++);
+	    }
+        }
 	p->expr_happened = 1;
 	p->pos++;
 	r = EvalExpr(&(p->pos), &val, p);
@@ -461,8 +523,15 @@ int ParseChar(ParsePtr p, int *err, int peek)
 	    DestroyParser(p);
 	    return 0;
 	}
+        while(*p->pos && (isempty(*p->pos))) {
+            p->pos++;
+        }
 	if (*p->pos != END_OF_EXPR) {
-	    *err = E_MISS_END;
+            if (*p->pos) {
+                *err = E_PARSE_ERR;
+            } else {
+                *err = E_MISS_END;
+            }
 	    DestroyParser(p);
 	    DestroyValue(val);
 	    return 0;
@@ -577,6 +646,57 @@ int ParseIdentifier(ParsePtr p, DynamicBuffer *dbuf)
    }
 }

+/***************************************************************/
+/*                                                             */
+/* ParseExpr                                                   */
+/*                                                             */
+/* We are expecting an expression here.  Parse it and return   */
+/* the value node tree.                                        */
+/*                                                             */
+/***************************************************************/
+expr_node * ParseExpr(ParsePtr p, int *r)
+{
+
+    int bracketed = 0;
+    expr_node *node;
+
+    if (p->isnested) {
+        *r = E_PARSE_ERR;  /* Can't nest expressions */
+        return NULL;
+    }
+    if (!p->pos) {
+        *r = E_PARSE_ERR;      /* Missing expression */
+        return NULL;
+    }
+
+    while (isempty(*p->pos)) (p->pos)++;
+    if (!*(p->pos)) {
+        *r = E_EOLN;
+        return NULL;
+    }
+    if (*p->pos == BEG_OF_EXPR) {
+	(p->pos)++;
+	bracketed = 1;
+    }
+    node = parse_expression(&(p->pos), r, NULL);
+    if (*r) {
+        return free_expr_tree(node);
+    }
+
+    if (bracketed) {
+	if (*p->pos != END_OF_EXPR) {
+            if (*p->pos) {
+                *r = E_PARSE_ERR;
+            } else {
+                *r = E_MISS_END;
+            }
+            return free_expr_tree(node);
+        }
+	(p->pos)++;
+    }
+    return node;
+}
+
 /***************************************************************/
 /*                                                             */
 /* EvaluateExpr                                                */
@@ -588,21 +708,22 @@ int ParseIdentifier(ParsePtr p, DynamicBuffer *dbuf)
 int EvaluateExpr(ParsePtr p, Value *v)
 {

-    int bracketed = 0;
    int r;
+    int nonconst = 0;
+    expr_node *node = ParseExpr(p, &r);

-    if (p->isnested) return E_PARSE_ERR;  /* Can't nest expressions */
-    if (!p->pos) return E_PARSE_ERR;      /* Missing expression */
-    while (isempty(*p->pos)) (p->pos)++;
-    if (*p->pos == BEG_OF_EXPR) {
-	(p->pos)++;
-	bracketed = 1;
+    if (r != OK) {
+        return r;
    }
-    r = EvalExpr(&(p->pos), v, p);
+    if (!node) {
+        return E_SWERR;
+    }
+
+    r = evaluate_expression(node, NULL, v, &nonconst);
+    free_expr_tree(node);
    if (r) return r;
-    if (bracketed) {
-	if (*p->pos != END_OF_EXPR) return E_MISS_END;
-	(p->pos)++;
+    if (nonconst) {
+        p->nonconst_expr = 1;
    }
    return OK;
 }
@@ -638,36 +759,36 @@ void Wprint(char const *fmt, ...)
 void Eprint(char const *fmt, ...)
 {
    va_list argptr;
+    char const *fname;

    /* Check if more than one error msg. from this line */
    if (!FreshLine && !ShowAllErrors) return;

-    if (FreshLine && FileName) {
-	FreshLine = 0;
-	if (strcmp(FileName, "-")) {
-	    (void) fprintf(ErrFp, "%s(%d): ", FileName, LineNo);
-            if (print_callstack(ErrFp)) {
-                (void) fprintf(ErrFp, ": ");
-            }
-        } else {
-	    (void) fprintf(ErrFp, "-stdin-(%d): ", LineNo);
-            if (print_callstack(ErrFp)) {
-                (void) fprintf(ErrFp, ": ");
-            }
-        }
-	if (DebugFlag & DB_PRTLINE) OutputLine(ErrFp);
-    } else if (FileName) {
-	fprintf(ErrFp, "       ");
-        if (print_callstack(ErrFp)) {
-            (void) fprintf(ErrFp, ": ");
-        }
+    if (!FileName) {
+        return;
    }

+    if (strcmp(FileName, "-")) {
+        fname = FileName;
+    } else {
+        fname = "-stdin-";
+    }
+    if (FreshLine) {
+        (void) fprintf(ErrFp, "%s(%d): ", fname, LineNo);
+    } else {
+	fprintf(ErrFp, "       ");
+    }
    va_start(argptr, fmt);
    (void) vfprintf(ErrFp, fmt, argptr);
    (void) fputc('\n', ErrFp);
    va_end(argptr);
-    return;
+    if (print_callstack(ErrFp)) {
+        (void) fprintf(ErrFp, "\n");
+    }
+    if (FreshLine) {
+        if (DebugFlag & DB_PRTLINE) OutputLine(ErrFp);
+    }
+    FreshLine = 0;
 }

 /***************************************************************/
@@ -836,6 +957,7 @@ int DoIf(ParsePtr p)
 	    }
    }

+    IfLinenos[NumIfs] = LineNo;
    NumIfs++;
    IfFlags &= ~(IF_MASK << (2*NumIfs - 2));
    IfFlags |= syndrome << (2 * NumIfs - 2);
@@ -900,7 +1022,7 @@ int DoIfTrig(ParsePtr p)
    if ((size_t) NumIfs >= IF_NEST) return E_NESTED_IF;
    if (ShouldIgnoreLine()) syndrome = IF_TRUE | BEFORE_ELSE;
    else {
-	if ( (r=ParseRem(p, &trig, &tim, 1)) ) return r;
+	if ( (r=ParseRem(p, &trig, &tim)) ) return r;
 	if (trig.typ != NO_TYPE) return E_PARSE_ERR;
 	dse = ComputeTrigger(trig.scanfrom, &trig, &tim, &r, 1);
 	if (r) {
@@ -1020,8 +1142,8 @@ int DoDebug(ParsePtr p)

        case 's':
        case 'S':
-	    if (val) DebugFlag |=  DB_EXPR_STACKS;
-	    else     DebugFlag &= ~DB_EXPR_STACKS;
+	    if (val) DebugFlag |=  DB_PARSE_EXPR;
+	    else     DebugFlag &= ~DB_PARSE_EXPR;
 	    break;

 	case 'x':
@@ -1089,7 +1211,7 @@ int DoBanner(ParsePtr p)
 	}
    }
    DBufFree(&Banner);
-    
+
    err = DBufPuts(&Banner, DBufValue(&buf));
    DBufFree(&buf);
    return err;
@@ -1101,7 +1223,6 @@ int DoBanner(ParsePtr p)
 /*                                                             */
 /*  Enable or disable the RUN command under program control    */
 /*                                                             */
-/*                                                             */
 /***************************************************************/
 int DoRun(ParsePtr p)
 {
@@ -1128,6 +1249,38 @@ int DoRun(ParsePtr p)
    return VerifyEoln(p);
 }

+/***************************************************************/
+/*                                                             */
+/*  DoExpr                                                     */
+/*                                                             */
+/*  Enable or disable expression evaluation                    */
+/*                                                             */
+/***************************************************************/
+int DoExpr(ParsePtr p)
+{
+    int r;
+
+    DynamicBuffer buf;
+    DBufInit(&buf);
+
+    if ( (r=ParseToken(p, &buf)) ) return r;
+
+/* Only allow EXPR ON in top-level script */
+    if (! StrCmpi(DBufValue(&buf), "ON")) {
+	if (TopLevel()) ExpressionEvaluationDisabled = 0;
+    }
+/* But allow EXPR OFF anywhere */
+    else if (! StrCmpi(DBufValue(&buf), "OFF"))
+        ExpressionEvaluationDisabled = 1;
+    else {
+	DBufFree(&buf);
+	return E_PARSE_ERR;
+    }
+    DBufFree(&buf);
+
+    return VerifyEoln(p);
+}
+
 /***************************************************************/
 /*                                                             */
 /*  DoFlush                                                    */
--- a/src/md5.h
+++ b/src/md5.h
@@ -6,6 +6,10 @@

 #include "config.h"

+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+typedef uint32_t uint32;
+#else
 #if SIZEOF_UNSIGNED_INT == 4
 typedef unsigned int uint32;
 #elif SIZEOF_UNSIGNED_LONG == 4
@@ -13,6 +17,7 @@ typedef unsigned long uint32;
 #else
 # error Could not find a 32-bit integer type
 #endif
+#endif

 struct MD5Context {
 	uint32 buf[4];
@@ -26,9 +31,4 @@ void MD5Update(struct MD5Context *context, unsigned char const *buf,
 void MD5Final(unsigned char digest[16], struct MD5Context *context);
 void MD5Transform(uint32 buf[4], uint32 const in[16]);

-/*
- * This is needed to make RSAREF happy on some MS-DOS compilers.
- */
-typedef struct MD5Context MD5_CTX;
-
 #endif /* !MD5_H */
--- a/src/moon.c
+++ b/src/moon.c
@@ -66,7 +66,6 @@
 #include <time.h>
 #include "types.h"
 #include "protos.h"
-#include "expr.h"
 #include "globals.h"
 #include "err.h"

--- a/src/omit.c
+++ b/src/omit.c
@@ -14,13 +14,12 @@
 #include "config.h"

 #include <stdio.h>
-
+#include <string.h>
 #include <stdlib.h>
 #include "types.h"
 #include "protos.h"
 #include "globals.h"
 #include "err.h"
-#include "expr.h"

 static int BexistsIntArray (int const array[], int num, int key);
 static void InsertIntoSortedArray (int *array, int num, int key);
@@ -37,6 +36,8 @@ int NumFullOmits, NumPartialOmits;
 /* The structure for saving and restoring OMIT contexts */
 typedef struct omitcontext {
    struct omitcontext *next;
+    char *filename;
+    int lineno;
    int numfull, numpart;
    int *fullsave;
    int *partsave;
@@ -79,19 +80,25 @@ int DoClear(ParsePtr p)
 /*                                                             */
 /*  Free all the memory used by saved OMIT contexts.           */
 /*  As a side effect, return the number of OMIT contexts       */
-/*  destroyed.                                                 */
+/*  destroyed.  If print_unmatched is true, print an error for */
+/*  each undestroyed OMIT contect                              */
 /*                                                             */
 /***************************************************************/
-int DestroyOmitContexts(void)
+int DestroyOmitContexts(int print_unmatched)
 {
    OmitContext *c = SavedOmitContexts;
    OmitContext *d;
    int num = 0;

    while (c) {
+        if (print_unmatched) {
+            Wprint("Unmatched PUSH-OMIT-CONTEXT at %s(%d)",
+                   c->filename, c->lineno);
+        }
 	num++;
 	if (c->fullsave) free(c->fullsave);
 	if (c->partsave) free(c->partsave);
+        if (c->filename) free(c->filename);
 	d = c->next;
 	free(c);
 	c = d;
@@ -116,16 +123,28 @@ int PushOmitContext(ParsePtr p)
    context = NEW(OmitContext);
    if (!context) return E_NO_MEM;

+    if (FileName) {
+        context->filename = StrDup(FileName);
+    } else {
+        context->filename = StrDup("");
+    }
+    if (!context->filename) {
+        free(context);
+        return E_NO_MEM;
+    }
+    context->lineno = LineNo;
    context->numfull = NumFullOmits;
    context->numpart = NumPartialOmits;
    context->weekdaysave = WeekdayOmits;
    context->fullsave = malloc(NumFullOmits * sizeof(int));
    if (NumFullOmits && !context->fullsave) {
+        free(context->filename);
 	free(context);
 	return E_NO_MEM;
    }
    context->partsave = malloc(NumPartialOmits * sizeof(int));
    if (NumPartialOmits && !context->partsave) {
+        free(context->filename);
 	free(context->fullsave);
 	free(context);
 	return E_NO_MEM;
@@ -175,6 +194,7 @@ int PopOmitContext(ParsePtr p)
 /* Free memory used by the saved context */
    if (c->partsave) free(c->partsave);
    if (c->fullsave) free(c->fullsave);
+    if (c->filename) free(c->filename);
    free(c);

    return VerifyEoln(p);
--- a/src/protos.h
+++ b/src/protos.h
@@ -13,6 +13,18 @@
 /* Suppress unused variable warnings */
 #define UNUSED(x) (void) x

+#ifdef HAVE_STRDUP
+#define StrDup strdup
+#endif
+
+#ifdef HAVE_STRNCASECMP
+#define StrinCmp strncasecmp
+#endif
+
+#ifdef HAVE_STRCASECMP
+#define StrCmpi strcasecmp
+#endif
+
 /* Define a string assignment macro - be careful!!! */
 #define STRSET(x, str) { if (x) free(x); (x) = StrDup(str); }

@@ -31,22 +43,30 @@
 int CallUserFunc (char const *name, int nargs, ParsePtr p);
 int DoFset (ParsePtr p);
 int DoFunset (ParsePtr p);
+void UnsetAllUserFuncs(void);
 void ProduceCalendar (void);
 char const *SimpleTime (int tim);
 char const *CalendarTime (int tim, int duration);
 int DoRem (ParsePtr p);
 int DoFlush (ParsePtr p);
 void DoExit (ParsePtr p);
-int ParseRem (ParsePtr s, Trigger *trig, TimeTrig *tim, int save_in_globals);
+int ParseRem (ParsePtr s, Trigger *trig, TimeTrig *tim);
 int TriggerReminder (ParsePtr p, Trigger *t, TimeTrig *tim, int dse, int is_queued, DynamicBuffer *output);
 int ShouldTriggerReminder (Trigger *t, TimeTrig *tim, int dse, int *err);
 int DoSubst (ParsePtr p, DynamicBuffer *dbuf, Trigger *t, TimeTrig *tt, int dse, int mode);
 int DoSubstFromString (char const *source, DynamicBuffer *dbuf, int dse, int tim);
 int ParseLiteralDate (char const **s, int *dse, int *tim);
 int ParseLiteralTime (char const **s, int *tim);
+expr_node *parse_expression(char const **e, int *r, Var *locals);
+
+int evaluate_expression(expr_node *node, Value *locals, Value *ans, int *nonconst);
+int evaluate_expr_node(expr_node *node, Value *locals, Value *ans, int *nonconst);
+void print_expr_tree(expr_node *node, FILE *fp);
+void unlimit_execution_time(void);
+expr_node *free_expr_tree(expr_node *node);
 int EvalExpr (char const **e, Value *v, ParsePtr p);
 int DoCoerce (char type, Value *v);
-void PrintValue  (Value *v, FILE *fp);
+char const *PrintValue  (Value *v, FILE *fp);
 int CopyValue (Value *dest, const Value *src);
 int ReadLine (void);
 int OpenFile (char const *fname);
@@ -65,8 +85,9 @@ int JulianToGregorianOffset(int y, int m);
 int ParseChar (ParsePtr p, int *err, int peek);
 int ParseToken (ParsePtr p, DynamicBuffer *dbuf);
 int ParseIdentifier (ParsePtr p, DynamicBuffer *dbuf);
+expr_node * ParseExpr(ParsePtr p, int *r);
+void print_expr_nodes_stats(void);
 int EvaluateExpr (ParsePtr p, Value *v);
-int Evaluate (char const **s, Var *locals, ParsePtr p);
 int FnPopValStack (Value *val);
 void Eprint (char const *fmt, ...);
 void Wprint (char const *fmt, ...);
@@ -86,10 +107,11 @@ int VerifyEoln (ParsePtr p);
 int DoDebug (ParsePtr p);
 int DoBanner (ParsePtr p);
 int DoRun (ParsePtr p);
+int DoExpr (ParsePtr p);
 int DoErrMsg (ParsePtr p);
 int ClearGlobalOmits (void);
 int DoClear (ParsePtr p);
-int DestroyOmitContexts (void);
+int DestroyOmitContexts (int print_unmatched);
 int PushOmitContext (ParsePtr p);
 int PopOmitContext (ParsePtr p);
 int IsOmitted (int dse, int localomit, char const *omitfunc, int *omit);
@@ -103,13 +125,26 @@ int ComputeTrigger (int today, Trigger *trig, TimeTrig *tim, int *err, int save_
 int ComputeTriggerNoAdjustDuration (int today, Trigger *trig, TimeTrig *tim, int *err, int save_in_globals, int duration_days);
 int AdjustTriggerForDuration(int today, int r, Trigger *trig, TimeTrig *tim, int save_in_globals);
 char *StrnCpy (char *dest, char const *source, int n);
+
+#ifndef HAVE_STRNCASECMP
 int StrinCmp (char const *s1, char const *s2, int n);
+#endif
+
+#ifndef HAVE_STRDUP
 char *StrDup (char const *s);
+#endif
+
+#ifndef HAVE_STRCASECMP
 int StrCmpi (char const *s1, char const *s2);
+#endif
+
+void strtolower(char *s);
+
 Var *FindVar (char const *str, int create);
+SysVar *FindSysVar (char const *name);
 int DeleteVar (char const *str);
 int SetVar (char const *str, Value const *val);
-int GetVarValue (char const *str, Value *val, Var *locals, ParsePtr p);
+int GetVarValue (char const *str, Value *val);
 int DoSet  (Parser *p);
 int DoUnset  (Parser *p);
 int DoDump (ParsePtr p);
@@ -122,10 +157,10 @@ int DoMsgCommand (char const *cmd, char const *msg, int is_queued);
 int ParseNonSpaceChar (ParsePtr p, int *err, int peek);
 unsigned int HashVal (char const *str);
 int DateOK (int y, int m, int d);
-Operator *FindOperator (char const *name, Operator where[], int num);
-BuiltinFunc *FindFunc (char const *name, BuiltinFunc where[], int num);
+BuiltinFunc *FindBuiltinFunc (char const *name);
 int InsertIntoSortBuffer (int dse, int tim, char const *body, int typ, int prio);
 void IssueSortedReminders (void);
+UserFunc *FindUserFunc(char const *name);
 int UserFuncExists (char const *fn);
 void DSEToHeb (int dse, int *hy, int *hm, int *hd);
 int HebNameToNum (char const *mname);
@@ -185,6 +220,7 @@ void set_cloexec(FILE *fp);
 int push_call(char const *filename, char const *func, int lineno);
 void clear_callstack(void);
 int print_callstack(FILE *fp);
+int have_callstack(void);
 void pop_call(void);
 void FixSpecialType(Trigger *trig);
 void WriteJSONTrigger(Trigger const *t, int include_tags, int today);
@@ -195,3 +231,11 @@ void WriteJSONTimeTrigger(TimeTrig const *tt);
 #include <wchar.h>
 void PutWideChar(wchar_t const wc, DynamicBuffer *output);
 #endif
+
+/* These functions are in utils.c and are used to detect overflow
+   in various arithmetic operators.  They have to be in separate
+   functions with extern linkage to defeat compiler optimizations
+   that would otherwise break the overflow checks. */
+extern int _private_mul_overflow(int a, int b);
+extern int _private_add_overflow(int a, int b);
+extern int _private_sub_overflow(int a, int b);
--- a/src/queue.c
+++ b/src/queue.c
@@ -34,7 +34,6 @@
 #include "globals.h"
 #include "err.h"
 #include "protos.h"
-#include "expr.h"

 #undef USE_INOTIFY
 #if defined(HAVE_SYS_INOTIFY_H) && defined(HAVE_INOTIFY_INIT1)
@@ -311,6 +310,12 @@ void HandleQueuedReminders(void)
    struct sigaction sa;
    char qid[64];

+    /* Disable any potential pending SIGALRMs */
+    alarm(0);
+
+    /* Un-limit execution time */
+    unlimit_execution_time();
+
    /* Turn off sorting -- otherwise, TriggerReminder has no effect! */
    SortByDate = 0;

@@ -354,7 +359,8 @@ void HandleQueuedReminders(void)

    if (ShouldFork || Daemon) {
        sa.sa_handler = SigIntHandler;
-        sa.sa_flags = 0;
+        sa.sa_flags = SA_RESTART;
+        sigemptyset(&sa.sa_mask);
        (void) sigaction(SIGINT, &sa, NULL);
        sa.sa_handler = SigContHandler;
        (void) sigaction(SIGCONT, &sa, NULL);
--- a/src/sort.c
+++ b/src/sort.c
@@ -18,7 +18,6 @@
 #include <stdlib.h>
 #include "types.h"
 #include "protos.h"
-#include "expr.h"
 #include "globals.h"
 #include "err.h"

--- a/src/token.c
+++ b/src/token.c
@@ -56,6 +56,7 @@ Token TokArray[] = {
    { "endif",		5,	T_EndIf,	0 },
    { "errmsg",         6,      T_ErrMsg,       0 },
    { "exit",		4,	T_Exit,		0 },
+    { "expr",           4,      T_Expr,         0 },
    { "february",	3,	T_Month,	1 },
    { "first",          5,      T_Ordinal,      0 },
    { "flush",		5,	T_Flush,	0 },
--- a/src/trigger.c
+++ b/src/trigger.c
@@ -15,7 +15,6 @@

 #include <stdlib.h>
 #include "types.h"
-#include "expr.h"
 #include "protos.h"
 #include "globals.h"
 #include "err.h"
--- a/src/types.h
+++ b/src/types.h
@@ -13,6 +13,22 @@
 #include <limits.h>
 #include "dynbuf.h"

+typedef struct udf_struct UserFunc;
+
+/* Define the types of values */
+#define ERR_TYPE       0
+#define INT_TYPE       1
+#define TIME_TYPE      2
+#define DATE_TYPE      3
+#define STR_TYPE       4
+#define DATETIME_TYPE  5
+#define SPECIAL_TYPE   6 /* Only for system variables */
+#define CONST_INT_TYPE 7 /* Only for system variables */
+
+#define BEG_OF_EXPR '['
+#define END_OF_EXPR ']'
+#define COMMA ','
+
 /* Values */
 typedef struct {
    char type;
@@ -22,29 +38,61 @@ typedef struct {
    } v;
 } Value;

-/* Define the type of operators */
-typedef struct {
-    char const *name;
-    char prec;
-    char type;
-    int (*func)(void);
-} Operator;
+/* New-style expr_node structure and constants */
+enum expr_node_type
+{
+    N_FREE,
+    N_ERROR,
+    N_CONSTANT,
+    N_LOCAL_VAR,
+    N_SHORT_VAR,
+    N_VARIABLE,
+    N_SHORT_SYSVAR,
+    N_SYSVAR,
+    N_BUILTIN_FUNC,
+    N_SHORT_USER_FUNC,
+    N_USER_FUNC,
+    N_OPERATOR,
+};

 /* Structure for passing in Nargs and out RetVal from functions */
 typedef struct {
    int nargs;
+    Value *args;
    Value retval;
 } func_info;

+/* Forward reference */
+typedef struct expr_node_struct expr_node;
+
 /* Define the type of user-functions */
 typedef struct {
    char const *name;
    char minargs;
    char maxargs;
    char is_constant;
+    /* Old-style function calling convention */
    int (*func)(func_info *);
+
+    /* New-style function calling convention */
+    int (*newfunc)(expr_node *node, Value *locals, Value *ans, int *nonconst);
 } BuiltinFunc;

+#define SHORT_NAME_BUF 16
+typedef struct expr_node_struct {
+    struct expr_node_struct *child;
+    struct expr_node_struct *sibling;
+    enum expr_node_type type;
+    int num_kids;
+    union {
+        Value value;
+        int arg;
+        BuiltinFunc *builtin_func;
+        char name[SHORT_NAME_BUF];
+        int (*operator_func) (struct expr_node_struct *node, Value *locals, Value *ans, int *nonconst);
+    } u;
+} expr_node;
+
 /* Define the structure of a variable */
 typedef struct var {
    struct var *next;
@@ -142,6 +190,8 @@ typedef Parser *ParsePtr;  /* Pointer to parser structure */
 #define MSF_TYPE 7
 #define PASSTHRU_TYPE 8

+/* For function arguments */
+#define NO_MAX 127

 /* DEFINES for debugging flags */
 #define DB_PRTLINE      1
@@ -150,7 +200,7 @@ typedef Parser *ParsePtr;  /* Pointer to parser structure */
 #define DB_DUMP_VARS    8
 #define DB_ECHO_LINE   16
 #define DB_TRACE_FILES 32
-#define DB_EXPR_STACKS 64
+#define DB_PARSE_EXPR  64

 /* Enumeration of the tokens */
 enum TokTypes
@@ -184,7 +234,8 @@ enum TokTypes
  T_MaybeUncomputable,
  T_Ordinal,
  T_In,
-  T_LastBack
+  T_LastBack,
+  T_Expr
 };

 /* The structure of a token */
@@ -244,3 +295,26 @@ typedef struct {
 #define TERMINAL_BACKGROUND_UNKNOWN -1
 #define TERMINAL_BACKGROUND_DARK    0
 #define TERMINAL_BACKGROUND_LIGHT   1
+
+typedef int (*SysVarFunc)(int, Value *);
+/* The structure of a system variable */
+typedef struct {
+    char const *name;
+    char modifiable;
+    int type;
+    void *value;
+    int min; /* Or const-value */
+    int max;
+} SysVar;
+
+/* Define the data structure used to hold a user-defined function */
+typedef struct udf_struct {
+    struct udf_struct *next;
+    char name[VAR_NAME_LEN+1];
+    expr_node *node;
+    char **args;
+    int nargs;
+    char const *filename;
+    int lineno;
+} UserFunc;
+
--- a/src/userfns.c
+++ b/src/userfns.c
@@ -16,43 +16,46 @@
 #include <stdio.h>
 #include <ctype.h>

+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#include <string.h>
+
 #include <stdlib.h>
 #include "types.h"
 #include "globals.h"
 #include "protos.h"
 #include "err.h"
-#include "expr.h"

 #define FUNC_HASH_SIZE 32   /* Size of User-defined function hash table */

-/* Define the data structure used to hold a user-defined function */
-typedef struct udf_struct {
-    struct udf_struct *next;
-    char name[VAR_NAME_LEN+1];
-    char const *text;
-    Var *locals;
-    char IsActive;
-    int nargs;
-    char const *filename;
-    int lineno;
-} UserFunc;
-
 /* The hash table */
 static UserFunc *FuncHash[FUNC_HASH_SIZE];

-/* Access to built-in functions */
-extern int NumFuncs;
-extern BuiltinFunc Func[];
-
-/* We need access to the expression evaluation stack */
-extern Value ValStack[];
-extern int ValStackPtr;
-
 static void DestroyUserFunc (UserFunc *f);
 static void FUnset (char const *name);
 static void FSet (UserFunc *f);
-static int SetUpLocalVars (UserFunc *f);
-static void DestroyLocalVals (UserFunc *f);
+
+/***************************************************************/
+/*                                                             */
+/*  HashVal                                                    */
+/*  Given a string, compute the hash value.                    */
+/*                                                             */
+/***************************************************************/
+unsigned int HashVal_nocase(char const *str)
+{
+    register unsigned int i=0;
+    register unsigned int j=1;
+    register unsigned int len=0;
+
+    while(*str && len < VAR_NAME_LEN) {
+	i += j * (*str);
+	str++;
+	len++;
+	j = 3-j;
+    }
+    return i;
+}

 /***************************************************************/
 /*                                                             */
@@ -75,6 +78,7 @@ int DoFunset(ParsePtr p)
            break;
        }
        seen_one = 1;
+        strtolower(DBufValue(&buf));
        FUnset(DBufValue(&buf));
        DBufFree(&buf);
    }
@@ -93,8 +97,11 @@ int DoFset(ParsePtr p)
 {
    int r;
    int c;
+    int i;
    UserFunc *func;
-    Var *v;
+    UserFunc *existing;
+    Var *locals = NULL;
+    Var local_array[MAX_FUNC_ARGS];
    int orig_namelen;

    DynamicBuffer buf;
@@ -119,6 +126,21 @@ int DoFset(ParsePtr p)
 	return E_PARSE_ERR;
    }

+    /* Convert to lower-case */
+    strtolower(DBufValue(&buf));
+
+    /* If the function exists and was defined at the same line of the same
+       file, do nothing */
+    existing = FindUserFunc(DBufValue(&buf));
+    if (existing) {
+        if (!strcmp(existing->filename, FileName) &&
+            strcmp(existing->filename, "[cmdline]") &&
+            existing->lineno == LineNo) {
+            DBufFree(&buf);
+            /* We already have it!  Our work here is done. */
+            return OK;
+        }
+    }
    func = NEW(UserFunc);
    if (!func) {
 	DBufFree(&buf);
@@ -137,25 +159,22 @@ int DoFset(ParsePtr p)
    StrnCpy(func->name, DBufValue(&buf), VAR_NAME_LEN);
    DBufFree(&buf);
    if (!Hush) {
-	if (FindFunc(func->name, Func, NumFuncs)) {
+	if (FindBuiltinFunc(func->name)) {
 	    Eprint("%s: `%s'", ErrMsg[E_REDEF_FUNC], func->name);
 	}
    }
-    func->locals = NULL;
-    func->text = NULL;
-    func->IsActive = 0;
+    func->node = NULL;
    func->nargs = 0;
+    func->args = NULL;

-    /* Get the local variables - we insert the local variables in REVERSE
-       order, but that's OK, because we pop them off the stack in reverse
-       order, too, so everything works out just fine. */
+    /* Get the local variables */

    c=ParseNonSpaceChar(p, &r, 1);
    if (r) return r;
    if (c == ')') {
 	(void) ParseNonSpaceChar(p, &r, 0);
-    }
-    else {
+    } else {
+        locals = local_array;
 	while(1) {
 	    if ( (r=ParseIdentifier(p, &buf)) ) return r;
 	    if (*DBufValue(&buf) == '$') {
@@ -163,18 +182,25 @@ int DoFset(ParsePtr p)
 		DestroyUserFunc(func);
 		return E_BAD_ID;
 	    }
-	    v = NEW(Var);
-	    if (!v) {
-		DBufFree(&buf);
-		DestroyUserFunc(func);
-		return E_NO_MEM;
-	    }
+            /* If we've already seen this local variable, error */
+            for (i=0; i<func->nargs; i++) {
+                if (!StrinCmp(DBufValue(&buf), local_array[i].name, VAR_NAME_LEN)) {
+                    DBufFree(&buf);
+                    DestroyUserFunc(func);
+                    return E_REPEATED_ARG;
+                }
+            }
+            i = func->nargs;
+            if (i >= MAX_FUNC_ARGS-1) {
+                DBufFree(&buf);
+                DestroyUserFunc(func);
+                return E_2MANY_ARGS;
+            }
+            local_array[i].v.type = ERR_TYPE;
+            StrnCpy(local_array[i].name, DBufValue(&buf), VAR_NAME_LEN);
+            local_array[i].next = &(local_array[i+1]);
+            local_array[i+1].next = NULL;
 	    func->nargs++;
-	    v->v.type = ERR_TYPE;
-	    StrnCpy(v->name, DBufValue(&buf), VAR_NAME_LEN);
-	    DBufFree(&buf);
-	    v->next = func->locals;
-	    func->locals = v;
 	    c = ParseNonSpaceChar(p, &r, 0);
 	    if (c == ')') break;
 	    else if (c != ',') {
@@ -189,17 +215,42 @@ int DoFset(ParsePtr p)
    if (c == '=') {
 	(void) ParseNonSpaceChar(p, &r, 0);
    }
-    /* Copy the text over */
    if (p->isnested) {
 	Eprint("%s", ErrMsg[E_CANTNEST_FDEF]);
 	DestroyUserFunc(func);
 	return E_PARSE_ERR;
    }

-    func->text = StrDup(p->pos);
-    if (!func->text) {
-	DestroyUserFunc(func);
-	return E_NO_MEM;
+    while(*(p->pos) && isspace(*(p->pos))) {
+        p->pos++;
+    }
+    if (!*(p->pos)) {
+        DestroyUserFunc(func);
+        return E_EOLN;
+    }
+    /* Parse the expression */
+    func->node = parse_expression(&(p->pos), &r, locals);
+    if (!func->node) {
+        DestroyUserFunc(func);
+        return r;
+    }
+
+    c = ParseNonSpaceChar(p, &r, 1);
+    if (c != 0) {
+        DestroyUserFunc(func);
+        return E_EXPECTING_EOL;
+    }
+
+    /* Save the argument names */
+    if (func->nargs) {
+        func->args = calloc(sizeof(char *), func->nargs);
+        for (i=0; i<func->nargs; i++) {
+            func->args[i] = StrDup(local_array[i].name);
+            if (!func->args[i]) {
+                DestroyUserFunc(func);
+                return E_NO_MEM;
+            }
+        }
    }

    /* If an old definition of this function exists, destroy it */
@@ -223,23 +274,22 @@ int DoFset(ParsePtr p)
 /***************************************************************/
 static void DestroyUserFunc(UserFunc *f)
 {
-    Var *v, *prev;
-
-    /* Free the local variables first */
-    v = f->locals;
-    while(v) {
-	DestroyValue(v->v);
-	prev = v;
-	v = v->next;
-	free(prev);
-    }
+    int i;

    /* Free the function definition */
-    if (f->text) free( (char *) f->text);
+    if (f->node) free_expr_tree(f->node);

    /* Free the filename */
    if (f->filename) free( (char *) f->filename);

+    /* Free arg names */
+    if (f->args) {
+        for (i=0; i<f->nargs; i++) {
+            if (f->args[i]) free(f->args[i]);
+        }
+        free(f->args);
+    }
+
    /* Free the data structure itself */
    free(f);
 }
@@ -257,12 +307,12 @@ static void FUnset(char const *name)
    UserFunc *cur, *prev;
    int h;

-    h = HashVal(name) % FUNC_HASH_SIZE;
+    h = HashVal_nocase(name) % FUNC_HASH_SIZE;

    cur = FuncHash[h];
    prev = NULL;
    while(cur) {
-	if (! StrinCmp(name, cur->name, VAR_NAME_LEN)) break;
+	if (! strncmp(name, cur->name, VAR_NAME_LEN)) break;
 	prev = cur;
 	cur = cur->next;
    }
@@ -280,134 +330,22 @@ static void FUnset(char const *name)
 /***************************************************************/
 static void FSet(UserFunc *f)
 {
-    int h = HashVal(f->name) % FUNC_HASH_SIZE;
+    int h = HashVal_nocase(f->name) % FUNC_HASH_SIZE;
    f->next = FuncHash[h];
    FuncHash[h] = f;
 }

-/***************************************************************/
-/*                                                             */
-/*  CallUserFunc                                               */
-/*                                                             */
-/*  Call a user-defined function.                              */
-/*                                                             */
-/***************************************************************/
-int CallUserFunc(char const *name, int nargs, ParsePtr p)
+UserFunc *FindUserFunc(char const *name)
 {
-    UserFunc *f;
-    int h = HashVal(name) % FUNC_HASH_SIZE;
-    int i;
-    char const *s;
+   UserFunc *f;
+   int h = HashVal_nocase(name) % FUNC_HASH_SIZE;

-    /* Search for the function */
-    f = FuncHash[h];
-    while (f && StrinCmp(name, f->name, VAR_NAME_LEN)) f = f->next;
-    if (!f) {
-	Eprint("%s: `%s'", ErrMsg[E_UNDEF_FUNC], name);
-	return E_UNDEF_FUNC;
-    }
-    /* Debugging stuff */
-    if (DebugFlag & DB_PRTEXPR) {
-	fprintf(ErrFp, "%s %s(", ErrMsg[E_ENTER_FUN], f->name);
-	for (i=0; i<nargs; i++) {
-	    PrintValue(&ValStack[ValStackPtr - nargs + i], ErrFp);
-	    if (i<nargs-1) fprintf(ErrFp, ", ");
-	}
-	fprintf(ErrFp, ")\n");
-    }
-    /* Detect illegal recursive call */
-    if (f->IsActive) {
-	if (DebugFlag &DB_PRTEXPR) {
-	    fprintf(ErrFp, "%s %s() => ", ErrMsg[E_LEAVE_FUN], name);
-	    fprintf(ErrFp, "%s\n", ErrMsg[E_RECURSIVE]);
-	}
-	return E_RECURSIVE;
-    }
-
-    /* Check number of args */
-    if (nargs != f->nargs) {
-	if (DebugFlag &DB_PRTEXPR) {
-	    fprintf(ErrFp, "%s %s() => ", ErrMsg[E_LEAVE_FUN], name);
-	    fprintf(ErrFp, "%s\n",
-		    ErrMsg[(nargs < f->nargs) ? E_2FEW_ARGS : E_2MANY_ARGS]);
-	}
-	return (nargs < f->nargs) ? E_2FEW_ARGS : E_2MANY_ARGS;
-    }
-    /* Found the function - set up a local variable frame */
-    h = SetUpLocalVars(f);
-    if (h) {
-	if (DebugFlag &DB_PRTEXPR) {
-	    fprintf(ErrFp, "%s %s() => ", ErrMsg[E_LEAVE_FUN], name);
-	    fprintf(ErrFp, "%s\n", ErrMsg[h]);
-	}
-	return h;
-    }
-
-    /* Evaluate the expression */
-    f->IsActive = 1;
-    s = f->text;
-
-    /* Skip the opening bracket, if there's one */
-    while (isempty(*s)) s++;
-    if (*s == BEG_OF_EXPR) {
-        s++;
-    }
-    push_call(f->filename, f->name, f->lineno);
-    h = Evaluate(&s, f->locals, p);
-    if (h == OK) {
-        pop_call();
-    }
-    f->IsActive = 0;
-    DestroyLocalVals(f);
-    if (DebugFlag &DB_PRTEXPR) {
-	fprintf(ErrFp, "%s %s() => ", ErrMsg[E_LEAVE_FUN], name);
-	if (h) fprintf(ErrFp, "%s\n", ErrMsg[h]);
-	else {
-	    PrintValue(&ValStack[ValStackPtr-1], ErrFp);
-	    fprintf(ErrFp, "\n");
-	}
-    }
-    return h;
+   /* Search for the function */
+   f = FuncHash[h];
+   while (f && strncmp(name, f->name, VAR_NAME_LEN)) f = f->next;
+   return f;
 }

-/***************************************************************/
-/*                                                             */
-/*  SetUpLocalVars                                             */
-/*                                                             */
-/*  Set up the local variables from the stack frame.           */
-/*                                                             */
-/***************************************************************/
-static int SetUpLocalVars(UserFunc *f)
-{
-    int i, r;
-    Var *var;
-
-    for (i=0, var=f->locals; var && i<f->nargs; var=var->next, i++) {
-	if ( (r=FnPopValStack(&(var->v))) ) {
-	    DestroyLocalVals(f);
-	    return r;
-	}
-    }
-    return OK;
-}
-
-/***************************************************************/
-/*                                                             */
-/*  DestroyLocalVals                                           */
-/*                                                             */
-/*  Destroy the values of all local variables after evaluating */
-/*  the function.                                              */
-/*                                                             */
-/***************************************************************/
-static void DestroyLocalVals(UserFunc *f)
-{
-    Var *v = f->locals;
-
-    while(v) {
-	DestroyValue(v->v);
-	v = v->next;
-    }
-}
 /***************************************************************/
 /*                                                             */
 /*  UserFuncExists                                             */
@@ -418,12 +356,33 @@ static void DestroyLocalVals(UserFunc *f)
 /***************************************************************/
 int UserFuncExists(char const *fn)
 {
-    UserFunc *f;
-    int h = HashVal(fn) % FUNC_HASH_SIZE;
+    UserFunc *f = FindUserFunc(fn);

-    f = FuncHash[h];
-    while (f && StrinCmp(fn, f->name, VAR_NAME_LEN)) f = f->next;
    if (!f) return -1;
    else return f->nargs;
 }

+/***************************************************************/
+/*                                                             */
+/*  UnsetAllUserFuncs                                          */
+/*                                                             */
+/*  Call FUNSET on all user funcs.  Used with -ds flag to      */
+/*  ensure no expr_node memory leaks.                          */
+/*                                                             */
+/***************************************************************/
+void
+UnsetAllUserFuncs(void)
+{
+    UserFunc *f;
+    UserFunc *next;
+    int i;
+    for (i=0; i<FUNC_HASH_SIZE; i++) {
+        f = FuncHash[i];
+        while(f) {
+            next = f->next;
+            DestroyUserFunc(f);
+            f = next;
+        }
+        FuncHash[i] = NULL;
+    }
+}
--- a/src/utils.c
+++ b/src/utils.c
@@ -17,6 +17,11 @@ static char const DontEscapeMe[] =
 #include "err.h"

 #include <string.h>
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
 #include <stdio.h>
 #include <ctype.h>

@@ -46,6 +51,7 @@ char *StrnCpy(char *dest, char const *source, int n)
    return odest;
 }

+#ifndef HAVE_STRNCASECMP
 /***************************************************************/
 /*                                                             */
 /*  StrinCmp - compare strings, case-insensitive               */
@@ -64,6 +70,9 @@ int StrinCmp(char const *s1, char const *s2, int n)
    if (n) return (toupper(*s1) - toupper(*s2)); else return 0;
 }

+#endif
+
+#ifndef HAVE_STRDUP
 /***************************************************************/
 /*                                                             */
 /*  StrDup                                                     */
@@ -79,6 +88,9 @@ char *StrDup(char const *s)
    return ret;
 }

+#endif
+
+#ifndef HAVE_STRCASECMP
 /***************************************************************/
 /*                                                             */
 /*  StrCmpi                                                    */
@@ -98,6 +110,8 @@ int StrCmpi(char const *s1, char const *s2)
    return toupper(*s1) - toupper(*s2);
 }

+#endif
+
 /***************************************************************/
 /*                                                             */
 /*  DateOK                                                     */
@@ -116,6 +130,14 @@ int DateOK(int y, int m, int d)
    return 1;
 }

+void strtolower(char *s)
+{
+    while (*s) {
+        *s = tolower(*s);
+        s++;
+    }
+}
+
 /* Functions designed to defeat gcc optimizer */

 int _private_mul_overflow(int a, int b)
@@ -151,11 +173,15 @@ int _private_sub_overflow(int a, int b)
 int
 ShellEscape(char const *in, DynamicBuffer *out)
 {
-    while(*in) {
-        if (!strchr(DontEscapeMe, *in)) {
-            if (DBufPutc(out, '\\') != OK) return E_NO_MEM;
+    unsigned char const *i = (unsigned char const *) in;
+    while(*i) {
+        /* Don't escape chars with high bit set.  That will mangle UTF-8 */
+        if (! (*i & 0x80) ) {
+            if (!strchr(DontEscapeMe, *i)) {
+                if (DBufPutc(out, '\\') != OK) return E_NO_MEM;
+            }
        }
-        if (DBufPutc(out, *in++) != OK) return E_NO_MEM;
+        if (DBufPutc(out, *i++) != OK) return E_NO_MEM;
    }
    return OK;
 }
@@ -169,31 +195,33 @@ typedef struct cs_s {
 } cs;

 static cs *callstack = NULL;
+static cs *freecs = NULL;

 static void
 destroy_cs(cs *entry)
 {
-    if (entry->filename) free( (void *) entry->filename);
-    if (entry->func) free( (void *) entry->func);
-    free( (void *) entry);
+    entry->next = freecs;
+    freecs = entry;
 }


 int
 push_call(char const *filename, char const *func, int lineno)
 {
-    cs *entry = NEW(cs);
-    if (!entry) {
-        return E_NO_MEM;
+    cs *entry;
+    if (freecs) {
+        entry = freecs;
+        freecs = freecs->next;
+    } else {
+        entry = NEW(cs);
+        if (!entry) {
+            return E_NO_MEM;
+        }
    }
    entry->next = NULL;
-    entry->filename = StrDup(filename);
-    entry->func = StrDup(func);
+    entry->filename = filename;
+    entry->func = func;
    entry->lineno = lineno;
-    if (!entry->filename || !entry->func) {
-        destroy_cs(entry);
-        return E_NO_MEM;
-    }
    entry->next = callstack;
    callstack = entry;
    return OK;
@@ -215,11 +243,35 @@ clear_callstack(void)
 static void
 print_callstack_aux(FILE *fp, cs *entry)
 {
-    if (entry) {
-        print_callstack_aux(fp, entry->next);
-        fprintf(fp, "\n");
-        (void) fprintf(fp, "%s(%d): In function `%s'", entry->filename, entry->lineno, entry->func);
+    int i = 0;
+    char const *in = "In";
+    cs *prev = NULL;
+    while(entry) {
+        if (prev) {
+            in = "Called from";
+        }
+        if (!prev || strcmp(prev->func, entry->func) || strcmp(prev->filename, entry->filename) || prev->lineno != entry->lineno) {
+            if (prev) {
+                fprintf(fp, "\n");
+            }
+            (void) fprintf(fp, "    %s(%d): [#%d] %s function `%s'", entry->filename, entry->lineno, i, in, entry->func);
+        }
+        prev = entry;
+        entry = entry->next;
+        i++;
+        if (i > 10) {
+            break;
+        }
    }
+    if (entry) {
+        (void) fprintf(fp, "\n    [remaining call frames omitted]");
+    }
+}
+
+int
+have_callstack(void)
+{
+    return (callstack != NULL);
 }

 int
--- a/src/var.c
+++ b/src/var.c
@@ -22,7 +22,6 @@
 #include <errno.h>
 #include <locale.h>
 #include "types.h"
-#include "expr.h"
 #include "globals.h"
 #include "protos.h"
 #include "err.h"
@@ -39,8 +38,6 @@ static int IntMax = INT_MAX;

 static Var *VHashTbl[VAR_HASH_SIZE];

-typedef int (*SysVarFunc)(int, Value *);
-
 static double
 strtod_in_c_locale(char const *str, char **endptr)
 {
@@ -175,6 +172,19 @@ static int terminal_bg_func(int do_set, Value *val)
    return OK;
 }

+static int trig_time_func(int do_set, Value *val)
+{
+    UNUSED(do_set);
+    if (LastTriggerTime != NO_TIME) {
+        val->type = TIME_TYPE;
+        val->v.val = LastTriggerTime;
+    } else {
+        val->type = INT_TYPE;
+        val->v.val = 0;
+    }
+    return OK;
+}
+
 static int trig_date_func(int do_set, Value *val)
 {
    UNUSED(do_set);
@@ -309,6 +319,29 @@ static int datetime_sep_func(int do_set, Value *val)
    return OK;
 }

+static int expr_time_limit_func(int do_set, Value *val)
+{
+    if (!do_set) {
+        val->type = INT_TYPE;
+        val->v.val = ExpressionEvaluationTimeLimit;
+        return OK;
+    }
+    if (val->type != INT_TYPE) return E_BAD_TYPE;
+    if (val->v.val < 0) return E_2LOW;
+
+    if (!TopLevel()) {
+        /* Ignore attempts to set from non-toplevel unless it's
+           lower than current value */
+        if (val->v.val == 0 ||
+            val->v.val >= ExpressionEvaluationTimeLimit) {
+            return OK;
+        }
+    }
+
+    ExpressionEvaluationTimeLimit = val->v.val;
+    return OK;
+}
+
 static int default_color_func(int do_set, Value *val)
 {
    int col_r, col_g, col_b;
@@ -477,7 +510,7 @@ int DeleteVar(char const *str)
 /*                                                             */
 /*  SetVar                                                     */
 /*                                                             */
-/*  Set the indicate variable to the specified value.          */
+/*  Set the indicated variable to the specified value.         */
 /*                                                             */
 /***************************************************************/
 int SetVar(char const *str, Value const *val)
@@ -498,20 +531,10 @@ int SetVar(char const *str, Value const *val)
 /*  Get a copy of the value of the variable.                   */
 /*                                                             */
 /***************************************************************/
-int GetVarValue(char const *str, Value *val, Var *locals, ParsePtr p)
+int GetVarValue(char const *str, Value *val)
 {
    Var *v;

-    /* Try searching local variables first */
-    v = locals;
-    while (v) {
-	if (! StrinCmp(str, v->name, VAR_NAME_LEN))
-	    return CopyValue(val, &v->v);
-	v = v->next;
-    }
-
-    /* Global variable... mark expression as non-constant */
-    if (p) p->nonconst_expr = 1;
    v=FindVar(str, 0);

    if (!v) {
@@ -544,6 +567,11 @@ int DoSet (Parser *p)
 	ParseNonSpaceChar(p, &r, 0);
    }

+    if (p->isnested) {
+        Eprint("%s", "Do not use [] around expression in SET command");
+        return E_CANTNEST_FDEF;
+    }
+
    r = EvaluateExpr(p, &v);
    if (r) {
 	DBufFree(&buf);
@@ -772,16 +800,6 @@ int DoPreserve (Parser *p)
 /*                                                             */
 /***************************************************************/

-/* The structure of a system variable */
-typedef struct {
-    char const *name;
-    char modifiable;
-    int type;
-    void *value;
-    int min; /* Or const-value */
-    int max;
-} SysVar;
-
 /* Macro to access "min" but as a constval.  Just to make source more
   readable */
 #define constval min
@@ -818,6 +836,7 @@ static SysVar SysVarArr[] = {
    {"DontTrigAts",    0,  INT_TYPE,     &DontIssueAts,        0,      0 },
    {"EndSent",        1,  STR_TYPE,     &EndSent,             0,      0 },
    {"EndSentIg",      1,  STR_TYPE,     &EndSentIg,           0,      0 },
+    {"ExpressionTimeLimit", 1, SPECIAL_TYPE, expr_time_limit_func, 0,  0 },
    {"February",       1,  STR_TYPE,     &DynamicMonthName[1], 0,      0 },
    {"FirstIndent",    1,  INT_TYPE,     &FirstIndent,         0,      132 },
    {"FoldYear",       1,  INT_TYPE,     &FoldYear,            0,      1 },
@@ -887,6 +906,7 @@ static SysVar SysVarArr[] = {
    {"Tm",             0,  SPECIAL_TYPE, trig_mon_func,        0,      0 },
    {"Today",          1,  STR_TYPE,     &DynamicToday,        0,      0 },
    {"Tomorrow",       1,  STR_TYPE,     &DynamicTomorrow,     0,      0 },
+    {"Tt",             0,  SPECIAL_TYPE, trig_time_func,       0,      0 },
    {"Tuesday",        1,  STR_TYPE,     &DynamicDayName[1],   0,      0 },
    {"Tw",             0,  SPECIAL_TYPE, trig_wday_func,       0,      0 },
    {"Ty",             0,  SPECIAL_TYPE, trig_year_func,       0,      0 },
@@ -905,7 +925,6 @@ static SysVar SysVarArr[] = {
 };

 #define NUMSYSVARS ( sizeof(SysVarArr) / sizeof(SysVar) )
-static SysVar *FindSysVar (char const *name);
 static void DumpSysVar (char const *name, const SysVar *v);
 /***************************************************************/
 /*                                                             */
@@ -1002,7 +1021,7 @@ int GetSysVar(char const *name, Value *val)
 /* Find a system var with specified name.                      */
 /*                                                             */
 /***************************************************************/
-static SysVar *FindSysVar(char const *name)
+SysVar *FindSysVar(char const *name)
 {
    int top=NUMSYSVARS-1, bottom=0;
    int mid=(top + bottom) / 2;
--- a/tests/ansicolors.rem
+++ b/tests/ansicolors.rem
@@ -35,8 +35,8 @@ set a ansicolor(-1, 0, 0)
 set a ansicolor(42, 42, 256)
 set a ansicolor("foo")
 set a ansicolor("1 1")
-set a ansicolor("-1 -1 0");
-set a ansicolor("256 1 1");
+set a ansicolor("-1 -1 0")
+set a ansicolor("256 1 1")
 set a ansicolor(128, 128, 128, 2)
 set a ansicolor(128, 128, 128, -1)
 set a ansicolor(128, 128, 128, 0, 2)
--- a/tests/expr.rem
+++ b/tests/expr.rem
@@ -0,0 +1,51 @@
+debug +sx
+
+set a 1
+
+set a 0&&0
+set a 0&&1
+set a 1&&0
+set a 1&&1
+
+set a 0||0
+set a 0||1
+set a 1||0
+set a 1||1
+
+set a 2, 3
+
+set a iif(0, "foo", 0, "bar", 1, "blech", 0, "quux", 1, "borhy", "wacka")
+
+set a max(2*3, 4+5, min(6*7+8, 7+6*8))
+
+set a max(1,,1)
+
+set a 5%0
+
+set a 5/0
+
+set a -$IntMin
+
+set a $IntMin / -1
+set a $IntMin % -1
+
+set a (7+5)*(8+2)/(9-4)
+
+set a "foo" * 5
+set a "foo" / 5
+set a "foo" * "five"
+set a "foo" + "bar"
+set a '2024-01-02' + 3
+set a 3 + '2024-01-02'
+set a 11:33 + 75
+set a 75 + 11:33
+set a '2024-01-01@11:33' + 1500
+set a 1500 + '2024-01-01@11:33'
+
+set a '2024-03-02' - '2024-01-01'
+set a 15:00 - 14:44
+
+
+set a (1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+1))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
+
+set a (1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+1)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
--- a/tests/if1.rem
+++ b/tests/if1.rem
@@ -0,0 +1,4 @@
+BANNER %
+set $AddBlankLines 0
+IF 1
+INCLUDE [filedir()]/if2.rem
--- a/tests/if2.rem
+++ b/tests/if2.rem
@@ -0,0 +1,5 @@
+# Another unmatched IF
+IF 0
+ELSE
+IF 1
+
--- a/tests/test-rem
+++ b/tests/test-rem
@@ -65,8 +65,6 @@ echo "Test 1" > ../tests/test.out
 echo "" >> ../tests/test.out
 ../src/remind -e -dxte ../tests/test.rem 16 feb 1991 12:13 >> ../tests/test.out 2>&1
 echo "" >> ../tests/test.out
-echo 'set a 1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+(1+2*3))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))' | ../src/remind -ds - 16 feb 1991 12:13 >> ../tests/test.out 2>&1
-echo "" >> ../tests/test.out
 echo "Test 2" >> ../tests/test.out
 echo "" >> ../tests/test.out
 ../src/remind -p -l ../tests/test2.rem 1 aug 2007 >> ../tests/test.out 2>&1
@@ -178,7 +176,7 @@ REM 1 Jan 2012 AT 10:00 MSG 10am: Should show up
 MSG [$DontTrigAts]
 EOF

-# An OMITFUNC should indicate nonconst_expr
+# OMITFUNC should indicate nonconst_expr
 ../src/remind -pp - 1 jan 2012 9:00 <<'EOF' >> ../tests/test.out 2>&1
 REM Mon OMITFUNC foo MSG bar
 EOF
@@ -541,6 +539,36 @@ EOF

 (echo 'BANNER %'; echo 'REM 29 MSG No bug') | ../src/remind -dt - 29 Feb 2024 >> ../tests/test.out 2>&1

+../src/remind -ifoo - <<'EOF' >> ../tests/test.out 2>&1
+BANNER %
+DUMP
+EOF
+
+../src/remind '-i$AddBlankLines' - <<'EOF' >> ../tests/test.out 2>&1
+BANNER %
+DUMP
+EOF
+
+../src/remind ../tests/expr.rem >> ../tests/test.out 2>&1
+
+../src/remind -  <<'EOF' >> ../tests/test.out 2>&1
+PUSH
+POP
+PUSH
+PUSH
+POP
+POP
+PUSH
+PUSH
+POP
+PUSH
+POP
+PUSH
+POP
+EOF
+
+../src/remind ../tests/if1.rem 2020-03-03 >> ../tests/test.out 2>&1
+
 # Remove references to SysInclude, which is build-specific
 grep -F -v '$SysInclude' < ../tests/test.out > ../tests/test.out.1 && mv -f ../tests/test.out.1 ../tests/test.out
 cmp -s ../tests/test.out ../tests/test.cmp
--- a/tests/test.cmp
+++ b/tests/test.cmp
--- a/tests/test.rem
+++ b/tests/test.rem
@@ -329,6 +329,7 @@ set a052 time(1+2, 3+4)
 rem 10 jan 1992 AT 11:22 CAL
 set a053 trigdate()
 set a054 trigtime()
+set a054b $Tt
 set a055 trigvalid()
 set a056 upper("sdfjhsdf ksjdfh kjsdfh ksjdfh")
 set a057 value("a05"+"6")
@@ -457,6 +458,7 @@ set a129 23:30 + '2019-02-02@16:44'
 REM 13 AT 16:00 DURATION 72:00 MSG 72-hour event
 set a130 trigdate()
 set a131 trigtime()
+set a131b $Tt
 set a132 trigdatetime()
 set a133 trigduration()
 set a134 trigeventstart()
@@ -775,12 +777,15 @@ ENDIF
 # Trig with a good warnfunc
 FSET w(x) choose(x, 5, 3, 1, 0)

-# Ugh.  This is where short-circuit logical operators
-# would really come in handy.
+Short-circuit operators
 IF trig("sun warn w") || trig("thu warn w")
    REM [trig()] +5 MSG Foo %b
 ENDIF

+IF trig("thu warn w") || trig("sun warn w")
+    REM [trig()] +5 MSG Foo %b
+ENDIF
+
 REM [trig("Mon", "Tue", "Wed", "Sat")] MSG foo
 REM [trig("Mon", "Tue", "Wed")] MSG bar

@@ -925,6 +930,21 @@ REM Tue OMIT 2024-01-01 MSG Wookie
 # No error
 REM Tue OMIT Wed 2024-01-01 MSG Blort

+# Make sure trigtime() is not reset between invocations
+REM Tue AT 16:00 DURATION 30 MSG Thing One
+REM [$T] AT [trigtime()+trigduration()] DURATION 15 MSG Thing Two
+REM [$T] AT [$Tt+trigduration()] DURATION 30 MSG Thing Three
+REM [$T] AT [trigtime()+trigduration()] DURATION 10 MSG Last Thing
+
+# Make sure trigtime is not reset during parsing
+REM Tue AT 16:00 MSG blort
+REM Tue AT 10:00 DURATION [$Tt] MSG blort
+REM Tue AT 16:00 MSG blort
+REM Tue AT 10:00 DURATION [trigtime()] MSG blort
+
+# Make sure shellescape does not mangle UTF-8 characters
+msg [shellescape("😆")]
+
 # Don't want Remind to queue reminders
 EXIT

--- a/www/Makefile.in
+++ b/www/Makefile.in
@@ -79,7 +79,7 @@ install:
 	chmod 755 $(DESTDIR)$(SCRIPTDIR)/calpdf $(DESTDIR)$(SCRIPTDIR)/calps $(DESTDIR)$(SCRIPTDIR)/hebdate \
 	$(DESTDIR)$(SCRIPTDIR)/hebps $(DESTDIR)$(SCRIPTDIR)/hebpdf $(DESTDIR)$(SCRIPTDIR)/moon \
 	$(DESTDIR)$(SCRIPTDIR)/sunrise $(DESTDIR)$(SCRIPTDIR)/sunset \
-        $(DESTDIR)$(SCRIPTDIR)/hebhtml \
+	$(DESTDIR)$(SCRIPTDIR)/hebhtml \

 	-mkdir -p $(DESTDIR)$(IMAGEDIR)
 	cp calendar.css rem-default.css *.png $(DESTDIR)$(IMAGEDIR)
Author	SHA1	Message	Date
Dianne Skoll	e33bf4e80a	Explicitly set sa_flags in sigaction.	2024-06-06 10:42:04 -04:00
Dianne Skoll	b3af44d212	Update docs/WHATSNEW for 05.00.00 release.	2024-06-06 10:28:38 -04:00
Dianne Skoll	1e753d5209	Preserve variables needed across iterations.	2024-06-05 15:08:12 -04:00
Dianne Skoll	4bf31005ea	Better error location in a couple more cases.	2024-06-05 09:15:10 -04:00
Dianne Skoll	7c86bc910a	Better diagnostics of unmatched IFs	2024-06-05 09:08:04 -04:00
Dianne Skoll	4f146a99a9	Simplify Eprint logic.	2024-06-04 21:10:17 -04:00
Dianne Skoll	a6a638e0e6	Add test for UNMATCHED PUSH	2024-06-04 16:27:23 -04:00
Dianne Skoll	325814f5e1	Print the location of unmatched PUSH	2024-06-04 16:25:14 -04:00
Dianne Skoll	5c4ea7d09e	Allow "configure" to work, haha.	2024-06-04 12:02:54 -04:00
Dianne Skoll	2bf73987ac	Don't need to flush unless we're about to print.	2024-06-04 11:56:05 -04:00
Dianne Skoll	3e9eeea8dc	Update docs; kill time-limiter when we queue.	2024-06-04 11:51:27 -04:00
Dianne Skoll	d164d72c1c	Update test file	2024-06-04 09:02:50 -04:00
Dianne Skoll	632cee62d9	Don't permit unary-minus overflow.	2024-06-04 09:02:26 -04:00
Dianne Skoll	7a40260f0d	Add some expression evaluation tests.	2024-06-04 08:37:19 -04:00
Dianne Skoll	09f043b3de	Don't print bytes allocated --- makes test output differ on different architectures.	2024-06-04 07:32:53 -04:00
Dianne Skoll	c0341c8ba3	Fix typo.	2024-06-03 21:54:12 -04:00
Dianne Skoll	850c717803	Handle unary '+' properly.	2024-06-03 20:20:54 -04:00
Dianne Skoll	f13f9e18bd	Somewhat better error reporting.	2024-06-03 20:14:11 -04:00
Dianne Skoll	8bdca0d684	More code refactoring.	2024-06-03 19:49:36 -04:00
Dianne Skoll	129bf5612e	Refactor some code.	2024-06-03 19:43:28 -04:00
Dianne Skoll	829962fae1	We don't need to check for excessive parse depth if we're not at the high water mark.	2024-06-03 19:35:42 -04:00
Dianne Skoll	c5f9ed8541	Fix logic error	2024-06-03 18:04:10 -04:00
Dianne Skoll	4a7cef4644	Better error diagnostics.	2024-06-03 18:02:19 -04:00
Dianne Skoll	0e010b56ec	Fix some error messages.	2024-06-03 17:59:11 -04:00
Dianne Skoll	ee179ee2f5	Suppress duplicate call frames.	2024-06-03 17:47:38 -04:00
Dianne Skoll	e28712cef3	Add "s" to list of debug flags.	2024-06-03 16:16:44 -04:00
Dianne Skoll	8f0a2a7e79	Limit parse high-water to 2000	2024-06-03 15:15:58 -04:00
Dianne Skoll	ef23bba77f	Track parse level high-water mark.	2024-06-03 15:13:32 -04:00
Dianne Skoll	602086ae2d	Make "-ds" show built-in functions with ucfirst and user-defined ones all lower-case.	2024-06-03 14:56:32 -04:00
Dianne Skoll	f5a170acbd	Update man page.	2024-06-03 11:58:37 -04:00
Dianne Skoll	8125b96f0b	Add --max-excution-time cmdline option.	2024-06-03 10:40:58 -04:00
Dianne Skoll	0bb7d89bb9	Update man page.	2024-06-03 10:14:36 -04:00
Dianne Skoll	eb109bbbc0	Finish commenting expr.c	2024-06-03 10:01:38 -04:00
Dianne Skoll	1a0809fd31	Start updating man page.	2024-06-02 23:23:06 -04:00
Dianne Skoll	09625b9d68	More docs	2024-06-02 23:07:49 -04:00
Dianne Skoll	4e164c4268	More comments.	2024-06-02 21:08:04 -04:00
Dianne Skoll	691185f22c	Update test file so tests pass.	2024-06-02 20:50:34 -04:00
Dianne Skoll	a8bfb41a9e	Add $ExpressionTimeLimit system variable.	2024-06-02 14:01:17 -04:00
Dianne Skoll	fafb30db05	Add --max-execution-time option	2024-06-02 12:56:46 -04:00
Dianne Skoll	243e816523	Add translated error messages	2024-06-02 12:43:32 -04:00
Dianne Skoll	b49c0f52bd	Implement EXPR ON and EXPR OFF	2024-06-02 12:39:00 -04:00
Dianne Skoll	07fca94a7f	Properly handle purging of SCANFROM reminders.	2024-06-02 12:07:12 -04:00
Dianne Skoll	73917ee537	Only set nonconst_expr in purge mode in a couple of cases.	2024-06-02 12:02:29 -04:00
Dianne Skoll	76f9edecf6	Don't purge reminders with a SCANFROM clause.	2024-06-02 10:36:21 -04:00
Dianne Skoll	d77d9854d2	Remove src/expr.h - everything in it is now in types.h or protos.h	2024-06-02 10:26:41 -04:00
Dianne Skoll	c2b53f95a4	Remove dead code	2024-06-02 10:23:24 -04:00
Dianne Skoll	caef8b80d6	Make it easier to match error messages to error constants.	2024-06-02 10:00:04 -04:00
Dianne Skoll	5e016768af	More comments.	2024-06-02 09:46:53 -04:00
Dianne Skoll	ee08ce98d7	More comments.	2024-06-01 23:33:33 -04:00
Dianne Skoll	581bd95838	Allow placing a literal [ in a reminder by using [[	2024-06-01 18:46:17 -04:00
Dianne Skoll	bb92dab1ab	More docs.	2024-06-01 16:44:37 -04:00
Dianne Skoll	83b5c52c76	Make parse_expr_token much any following whitespace to replicate prior behavior. There may be other parts of the code that rely on this.	2024-06-01 16:35:20 -04:00
Dianne Skoll	93eca25141	Fix spurious "Missing ']'" error reported by Jochen Sprickerhof	2024-06-01 16:30:48 -04:00
Dianne Skoll	34421cb10e	Don't funset the Jewish holiday functions.	2024-06-01 14:08:48 -04:00
Dianne Skoll	29b87898aa	Add some ASCII art	2024-06-01 14:00:39 -04:00
Dianne Skoll	e9e4db94bd	More comments	2024-06-01 13:44:21 -04:00
Dianne Skoll	c95ad0261a	Start adding comments; do not distinguish between N_BINARY_OPERATOR and N_UNARY_OPERATOR	2024-06-01 13:37:58 -04:00
Dianne Skoll	7fef456483	Don't allocate - nodes if we don't need to	2024-06-01 13:23:52 -04:00
Dianne Skoll	386131e74d	Show bytes used for expression notes.	2024-06-01 09:45:37 -04:00
Dianne Skoll	824d3c88f1	Store at most 5 function args on stack. Any more and we malloc.	2024-06-01 09:41:26 -04:00
Dianne Skoll	18a206abd2	Store args on stack if possible.	2024-06-01 09:30:42 -04:00
Dianne Skoll	8dbae776c9	Fix SEGV.	2024-06-01 09:27:27 -04:00
Dianne Skoll	b78702cc53	Assume all function names are lower-case.	2024-06-01 08:46:27 -04:00
Dianne Skoll	d2b43605ad	Completely revamp expression engine.	2024-06-01 08:19:12 -04:00
Dianne Skoll	7728e09337	Don't allow duplicate arg names in function definitions.	2024-06-01 08:19:09 -04:00
Dianne Skoll	2666353ce6	Put an include guard around auto.rem	2024-06-01 08:19:08 -04:00
Dianne Skoll	0b8a306483	Disable CI for "wip" branches.	2024-06-01 08:19:08 -04:00
Dianne Skoll	b51a0b2d08	Document that -ivar is the same as -ivar=0	2024-05-25 10:26:00 -04:00
Dianne Skoll	959355b19c	Stricter parsing of '-i' option.	2024-05-25 09:36:33 -04:00
Dianne Skoll	9c3f0f1994	Allow "-ifoo" on the command-line, which is the same as "-ifoo=0"	2024-05-25 09:22:41 -04:00
Dianne Skoll	dac337a65b	Convert all leading spaces to tabs. Per Tim Chase.	2024-05-01 09:48:59 -04:00
Dianne Skoll	98739dfdbc	Replace spaces with tab (per Emanuele Torre) Because different invisible things are different.	2024-05-01 09:11:19 -04:00
Dianne Skoll	17b7a1ea84	Fix typo	2024-04-29 17:13:52 -04:00
Dianne Skoll	4d45925758	Fix typo	2024-04-29 16:18:49 -04:00
Dianne Skoll	8cadb23f48	Update release notes.	2024-04-29 16:16:42 -04:00
Dianne Skoll	63211b65c2	Bump version to 04.03.07	2024-04-22 14:55:47 -04:00
Dianne Skoll	1be84525b1	Don't rely on behavior of "%" with negative args.	2024-04-22 09:57:32 -04:00
Dianne Skoll	67ae95a464	Make sure shellescape() does not mangle UTF-8 characters.	2024-04-22 09:50:17 -04:00
Dianne Skoll	c03a95ad94	Use built-in versions of strdup, strcasecmp and strncasecmp instead of writing our own.	2024-04-21 14:44:24 -04:00
Dianne Skoll	51aa7aecb9	Make $Tt a synonym for trigtime()	2024-04-20 11:50:39 -04:00
Dianne Skoll	592cfe5a20	Use "uint32_t" if we have <stdint.h> for MD5 code.	2024-04-20 10:50:44 -04:00
Dianne Skoll	b4cf15e73e	Remove some unused autoconf cruft.	2024-04-20 10:45:22 -04:00
Dianne Skoll	862e143372	Ugh, forgot to regen ./configure.	2024-04-20 10:40:06 -04:00
Dianne Skoll	1f10ca49ad	Pass proper args to AC_INIT; include Remind home page in usage output.	2024-04-20 10:39:12 -04:00
Dianne Skoll	4a0c4ffdca	Add a test to ensure we don't save trigger time while parsing.	2024-04-18 23:48:30 -04:00
Dianne Skoll	27c8737f3a	Only save trigger date when computing it, not while parsing.	2024-04-18 23:41:47 -04:00
Dianne Skoll	ecf45fc453	Add tests for commit `0a1178cfd7`: Don't clear out last trigger time unnecessarily.	2024-04-18 18:32:38 -04:00
Dianne Skoll	0a1178cfd7	Don't clear out last trigger time unnecessarily.	2024-04-18 17:56:49 -04:00
Dianne Skoll	20a35dc627	Put the tabbed notebook blurb after the blurb about obtaining default settings.	2024-04-10 09:44:40 -04:00
Dianne Skoll	79887c06f0	Tweak wording.	2024-04-10 09:43:13 -04:00
Dianne Skoll	f7ff424904	Remove debugging line.	2024-04-04 13:43:44 -04:00
Dianne Skoll	6678721fe3	Make build.tk add a little note if it obtained default settings from an existing Remind installation.	2024-04-04 13:42:31 -04:00
Dianne Skoll	496302097b	Add a missing release note... sigh.	2024-04-02 09:13:59 -04:00