mg_get_cookie() moved to string.c

build/src/string.c

@@ -335,3 +335,42 @@ static int get_request_len(const char *buf, int buf_len) {
 
   return 0;
 }
+
+int mg_get_cookie(const char *cookie_header, const char *var_name,
+                  char *dst, size_t dst_size) {
+  const char *s, *p, *end;
+  int name_len, len = -1;
+
+  if (dst == NULL || dst_size == 0) {
+    len = -2;
+  } else if (var_name == NULL || (s = cookie_header) == NULL) {
+    len = -1;
+    dst[0] = '\0';
+  } else {
+    name_len = (int) strlen(var_name);
+    end = s + strlen(s);
+    dst[0] = '\0';
+
+    for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) {
+      if (s[name_len] == '=') {
+        s += name_len + 1;
+        if ((p = strchr(s, ' ')) == NULL)
+          p = end;
+        if (p[-1] == ';')
+          p--;
+        if (*s == '"' && p[-1] == '"' && p > s + 1) {
+          s++;
+          p--;
+        }
+        if ((size_t) (p - s) < dst_size) {
+          len = p - s;
+          mg_strlcpy(dst, s, (size_t) len + 1);
+        } else {
+          len = -3;
+        }
+        break;
+      }
+    }
+  }
+  return len;
+}