/* Copyright (c) 2003, Roger Dingledine

 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.

 * Copyright (c) 2007-2021, The Tor Project, Inc. */

/* See LICENSE for licensing information */

/**

 * \file keyval.c

 *

 * \brief Handle data encoded as a key=value pair.

 **/

#include "orconfig.h"

#include "lib/encoding/keyval.h"

#include "lib/log/escape.h"

#include "lib/log/log.h"

#include "lib/log/util_bug.h"

#include <stdlib.h>

#include <string.h>

/** Return true if <b>string</b> is a valid 'key=[value]' string.

 *  "value" is optional, to indicate the empty string. Log at logging

 *  <b>severity</b> if something ugly happens. */

int

string_is_key_value(int severity, const char *string)

{

  /* position of equal sign in string */

  const char *equal_sign_pos = NULL;

  tor_assert(string);

  if (strlen(string) < 2) { /* "x=" is shortest args string */

    tor_log(severity, LD_GENERAL, "'%s' is too short to be a k=v value.",

            escaped(string));

    return 0;

  }

  equal_sign_pos = strchr(string, '=');

  if (!equal_sign_pos) {

    tor_log(severity, LD_GENERAL, "'%s' is not a k=v value.", escaped(string));

    return 0;

  }

  /* validate that the '=' is not in the beginning of the string. */

  if (equal_sign_pos == string) {

    tor_log(severity, LD_GENERAL, "'%s' is not a valid k=v value.",

            escaped(string));

    return 0;

  }

  return 1;

}