From fc93ae890aef181dd38cba7e29e8bc9779545cac Mon Sep 17 00:00:00 2001
From: Dianne Skoll <dianne@skoll.ca>
Date: Sat, 17 Sep 2022 23:04:34 -0400
Subject: [PATCH] Allow NULL pointers to be supplied to FromJulian if we are
 not interested in specific values

---
 src/calendar.c |  4 ++--
 src/main.c     | 15 +++++++++++----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/calendar.c b/src/calendar.c
index 589e7e2d..ec9a9f86 100644
--- a/src/calendar.c
+++ b/src/calendar.c
@@ -301,8 +301,8 @@ static void WriteCalDays (void);
 static int
 DayOf(int jul)
 {
-    int y, m, d;
-    FromJulian(jul, &y, &m, &d);
+    int d;
+    FromJulian(jul, NULL, NULL, &d);
     return d;
 }
 
diff --git a/src/main.c b/src/main.c
index a1b92af1..a07f4622 100644
--- a/src/main.c
+++ b/src/main.c
@@ -329,7 +329,8 @@ int Julian(int year, int month, int day)
 /*                                                             */
 /*  FromJulian                                                 */
 /*                                                             */
-/*  Convert a Julian date to year, month, day.                 */
+/*  Convert a Julian date to year, month, day.  You may supply */
+/*  NULL for y, m or d if you're not interested in that value  */
 /*                                                             */
 /***************************************************************/
 void FromJulian(int jul, int *y, int *m, int *d)
@@ -358,9 +359,15 @@ void FromJulian(int jul, int *y, int *m, int *d)
 	try_mon++;
 	t = DaysInMonth(try_mon, try_yr);
     }
-    *y = try_yr;
-    *m = try_mon;
-    *d = jul + 1;
+    if (y) {
+        *y = try_yr;
+    }
+    if (m) {
+        *m = try_mon;
+    }
+    if (d) {
+        *d = jul + 1;
+    }
     return;
 }