Update JSON parser to latest version from https://github.com/udp/json-parser

src/json.h

@@ -1,7 +1,8 @@
+
 /* vim: set et ts=3 sw=3 sts=3 ft=c:
  *
- * Copyright (C) 2012, 2013, 2014 James McLaughlin et al.  All rights reserved.
- * https://github.com/udp/json-parser
+ * Copyright (C) 2012-2021 the json-parser authors  All rights reserved.
+ * https://github.com/json-parser/json-parser
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,15 +36,22 @@
 #endif
 
 #ifndef json_int_t
-   #ifndef _MSC_VER
-      #include <inttypes.h>
-      #define json_int_t int64_t
-   #else
+   #undef JSON_INT_T_OVERRIDDEN
+   #if defined(_MSC_VER)
       #define json_int_t __int64
+   #elif (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || (defined(__cplusplus) && __cplusplus >= 201103L)
+      /* C99 and C++11 */
+      #include <stdint.h>
+      #define json_int_t int_fast64_t
+   #else
+      /* C89 */
+      #define json_int_t long
    #endif
+#else
+   #define JSON_INT_T_OVERRIDDEN 1
 #endif
 
-#include <stdlib.h>
+#include <stddef.h>
 
 #ifdef __cplusplus
 
@@ -56,7 +64,7 @@
 
 typedef struct
 {
-   unsigned long max_memory;
+   unsigned long max_memory;  /* should be size_t, but would modify the API */
    int settings;
 
    /* Custom allocator support (leave null to use malloc/free)
@@ -122,11 +130,11 @@ typedef struct _json_value
 
          json_object_entry * values;
 
-         #if defined(__cplusplus) && __cplusplus >= 201103L
-         decltype(values) begin () const
+         #if defined(__cplusplus)
+         json_object_entry * begin () const
          {  return values;
          }
-         decltype(values) end () const
+         json_object_entry * end () const
          {  return values + length;
          }
          #endif
@@ -138,11 +146,11 @@ typedef struct _json_value
          unsigned int length;
          struct _json_value ** values;
 
-         #if defined(__cplusplus) && __cplusplus >= 201103L
-         decltype(values) begin () const
+         #if defined(__cplusplus)
+         _json_value ** begin () const
          {  return values;
          }
-         decltype(values) end () const
+         _json_value ** end () const
          {  return values + length;
          }
          #endif