compat_strlcpy.c

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