compat/strlcpy.c

   1 /*****************************************************************************
   2  * strlcpy.c: BSD strlcpy() replacement
   3  *****************************************************************************
   4  * Copyright © 2006, 2009 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <string.h>
  26
  27 /**
  28  * Copy a string to a sized buffer. The result is always nul-terminated
  29  * (contrary to strncpy()).
  30  *
  31  * @param dest destination buffer
  32  * @param src string to be copied
  33  * @param len maximum number of characters to be copied plus one for the
  34  * terminating nul.
  35  *
  36  * @return strlen(src)
  37  */
  38 size_t strlcpy (char *tgt, const char *src, size_t bufsize)
  39 {
  40     size_t length = strlen(src);
  41
  42     if (bufsize > length)
  43         memcpy(tgt, src, length + 1);
  44     else
  45     if (bufsize > 0)
  46         memcpy(tgt, src, bufsize - 1), tgt[bufsize - 1] = '\0';
  47
  48     return length;
  49 }