compat_strlcpy.c

   1 #include "config.h"
   2
   3 #if HAVE_STRLCPY
   4
   5 int dummy;
   6
   7 #else
   8
   9 /*      $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $    */
  10
  11 /*
  12  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  13  *
  14  * Permission to use, copy, modify, and distribute this software for any
  15  * purpose with or without fee is hereby granted, provided that the above
  16  * copyright notice and this permission notice appear in all copies.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  19  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  21  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  22  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  23  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  24  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  25  */
  26
  27 #include <sys/types.h>
  28 #include <string.h>
  29
  30 /*
  31  * Copy src to string dst of size siz.  At most siz-1 characters
  32  * will be copied.  Always NUL terminates (unless siz == 0).
  33  * Returns strlen(src); if retval >= siz, truncation occurred.
  34  */
  35 size_t
  36 strlcpy(char *dst, const char *src, size_t siz)
  37 {
  38         char *d = dst;
  39         const char *s = src;
  40         size_t n = siz;
  41
  42         /* Copy as many bytes as will fit */
  43         if (n != 0) {
  44                 while (--n != 0) {
  45                         if ((*d++ = *s++) == '\0')
  46                                 break;
  47                 }
  48         }
  49
  50         /* Not enough room in dst, add NUL and traverse rest of src */
  51         if (n == 0) {
  52                 if (siz != 0)
  53                         *d = '\0';              /* NUL-terminate dst */
  54                 while (*s++)
  55                         ;
  56         }
  57
  58         return(s - src - 1);    /* count does not include NUL */
  59 }
  60
  61 #endif