libdabba/strlcpy.c

   1 /**
   2  * \file strlcpy.c
   3  * \author written by Linus Torvalds  torvalds@osdl.org (c) 1991, 1992
   4  * \date 1992
   5  */
   6
   7 /*
   8  * Copyright (C) 1991, 1992  Linus Torvalds
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  18  * for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
  23  */
  24
  25 /* strlcpy.c taken from the Linux kernel and adapted */
  26
  27 #include <string.h>
  28
  29 /**
  30  * \brief Copy a %NUL terminated string into a sized buffer
  31  * \param[in] dest      Where to copy the string to
  32  * \param[in] src       Where to copy the string from
  33  * \param[in] size      Size of destination buffer
  34  *
  35  * Compatible with *BSD: the result is always a valid
  36  * NUL-terminated string that fits in the buffer (unless,
  37  * of course, the buffer size is zero). It does not pad
  38  * out the result like \c strncpy(3) does.
  39  */
  40
  41 size_t strlcpy(char *dest, const char *src, size_t size)
  42 {
  43         size_t ret = strlen(src);
  44
  45         if (size) {
  46                 size_t len = (ret >= size) ? size - 1 : ret;
  47                 memcpy(dest, src, len);
  48                 dest[len] = '\0';
  49         }
  50
  51         return ret;
  52 }