Add mg_strfree()

CL: Add mg_strfree()

PUBLISHED_FROM=b80566218986e0607a9d2758bf776a1031b27212

mongoose.c

@@ -1774,6 +1774,14 @@ int mg_strncmp(const struct mg_str str1, const struct mg_str str2, size_t n) {
   return mg_strcmp(s1, s2);
 }
 
+void mg_strfree(struct mg_str *s) WEAK;
+void mg_strfree(struct mg_str *s) {
+  char *sp = (char *) s->p;
+  s->p = NULL;
+  s->len = 0;
+  if (sp != NULL) free(sp);
+}
+
 const char *mg_strstr(const struct mg_str haystack,
                       const struct mg_str needle) WEAK;
 const char *mg_strstr(const struct mg_str haystack,

mongoose.h

@@ -2280,6 +2280,11 @@ int mg_strcmp(const struct mg_str str1, const struct mg_str str2);
  */
 int mg_strncmp(const struct mg_str str1, const struct mg_str str2, size_t n);
 
+/*
+ * Free the string (assuming it was heap allocated).
+ */
+void mg_strfree(struct mg_str *s);
+
 /*
  * Finds the first occurrence of a substring `needle` in the `haystack`.
  */