/*

 * Copyright (C) 2002-2025 Free Software Foundation, Inc.

 *

 * This file is part of LIBTASN1.

 *

 * The LIBTASN1 library is free software; you can redistribute it

 * and/or modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see

 * <https://www.gnu.org/licenses/>.

 */

#include <config.h>

#include "int.h"

#include "gstr.h"

/* These function are like strcat, strcpy. They only

 * do bounds checking (they shouldn't cause buffer overruns),

 * and they always produce null terminated strings.

 *

 * They should be used only with null terminated strings.

 */

void

_asn1_str_cat (char *dest, size_t dest_tot_size, const char *src)

{

  size_t str_size = strlen (src);

  size_t dest_size = strlen (dest);

  if (dest_tot_size - dest_size > str_size)

    {

      strcat (dest, src);

    }

  else

    {

      if (dest_tot_size > dest_size)

  {

    strncat (dest, src, (dest_tot_size - dest_size) - 1);

    dest[dest_tot_size - 1] = 0;

  }

    }

}

/* Returns the bytes copied (not including the null terminator) */

unsigned int

_asn1_str_cpy (char *dest, size_t dest_tot_size, const char *src)

{

  size_t str_size = strlen (src);

  if (dest_tot_size > str_size)

    {

      strcpy (dest, src);

      return str_size;

    }

  else

    {

      if (dest_tot_size > 0)

  {

    str_size = dest_tot_size - 1;

    memcpy (dest, src, str_size);

    dest[str_size] = 0;

    return str_size;

  }

      else

  return 0;

    }

}