// SPDX-License-Identifier: LGPL-2.1-or-later

/* Copy a null-terminated string to a fixed-size buffer, with length checking.

 * Copyright (C) 2016 Free Software Foundation, Inc.

 * This file is part of the GNU C Library.

 */

/* adapted for Quagga from glibc patch submission originally from

 * Florian Weimer <fweimer@redhat.com>, 2016-05-18 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <string.h>

#ifndef HAVE_STRLCPY

#undef strlcpy

size_t strlcpy(char *__restrict dest,

         const char *__restrict src, size_t destsize);

size_t strlcpy(char *__restrict dest,

         const char *__restrict src, size_t destsize)

{

  size_t src_length = strlen(src);

  if (__builtin_expect(src_length >= destsize, 0)) {

    if (destsize > 0) {

      /*

       * Copy the leading portion of the string.  The last

       * character is subsequently overwritten with the NUL

       * terminator, but the destination destsize is usually

       * a multiple of a small power of two, so writing it

       * twice should be more efficient than copying an odd

       * number of bytes.

       */

      memcpy(dest, src, destsize);

      dest[destsize - 1] = '\0';

    }

  } else

    /* Copy the string and its terminating NUL character.  */

    memcpy(dest, src, src_length + 1);

  return src_length;

}

#endif /* HAVE_STRLCPY */