fix: bad pointer handling

Closes #21

Author: lcsmuller

Diff for: jsmn-find.h

@@ -407,9 +407,9 @@ jsmnf_find_path(const struct jsmnf_pair *head,
         const unsigned new_size = *(prev_size)*2;                             \
         void *tmp = realloc((ptr), new_size * sizeof *(ptr));                 \
         if (!tmp) return JSMN_ERROR_NOMEM;                                    \
-        memset((tmp) + *(prev_size), 0,                                       \
-               (new_size - *(prev_size)) * sizeof *(ptr));                    \
         (ptr) = tmp;                                                          \
+        memset((ptr) + *(prev_size), 0,                                       \
+               (new_size - *(prev_size)) * sizeof *(ptr));                    \
         *(prev_size) = new_size;                                              \
     } while (0)
 

Diff for: test/functions.c

@@ -27,6 +27,32 @@ print_jsmnerr(enum jsmnerr code)
     return "Unknown error";
 }
 
+TEST
+check_not_corrupted(void)
+{
+    const char json[] =
+        "{\"status\":\"enabled\",\"timestamp\":\"2023-08-24T07:59:03Z\"}\n";
+    jsmn_parser parser;
+    jsmntok_t *toks = NULL;
+    unsigned num_tokens = 0;
+    long ret;
+
+    jsmn_init(&parser);
+
+    ret = jsmn_parse_auto(&parser, json, strlen(json), &toks, &num_tokens);
+    ASSERT_GTm(print_jsmnerr(ret),
+               ret = jsmn_parse_auto(&parser, json, sizeof(json) - 1, &toks,
+                                     &num_tokens),
+               0);
+
+    PASS();
+}
+
+SUITE(fn__jsmn_load_auto)
+{
+    RUN_TEST(check_not_corrupted);
+}
+
 TEST
 check_load_dynamic_pairs(void)
 {
@@ -385,7 +411,9 @@ check_find_array(void)
     PASS();
 }
 
-#define OBJ1_NEST "{ \"username\": null, \"avatar\": null, \"avatar_decoration\": null, \"bar\": null, \"foo\": 1 }"
+#define OBJ1_NEST                                                             \
+    "{ \"username\": null, \"avatar\": null, \"avatar_decoration\": null, "   \
+    "\"bar\": null, \"foo\": 1 }"
 #define OBJ1 "{ \"foo\": " OBJ1_NEST " }"
 #define OBJ2 "{ \"foo\": null }"
 TEST