crypto/openssh-3.8.1p1/openbsd-compat/strlcpy.c

   1 /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */
   2
   3 /*      $OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $     */
   4
   5 /*
   6  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
   7  *
   8  * Permission to use, copy, modify, and distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  */
  20
  21 #include "includes.h"
  22 #ifndef HAVE_STRLCPY
  23
  24 #if defined(LIBC_SCCS) && !defined(lint)
  25 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $";
  26 #endif /* LIBC_SCCS and not lint */
  27
  28 #include <sys/types.h>
  29 #include <string.h>
  30
  31 /*
  32  * Copy src to string dst of size siz.  At most siz-1 characters
  33  * will be copied.  Always NUL terminates (unless siz == 0).
  34  * Returns strlen(src); if retval >= siz, truncation occurred.
  35  */
  36 size_t
  37 strlcpy(char *dst, const char *src, size_t siz)
  38 {
  39         register char *d = dst;
  40         register const char *s = src;
  41         register size_t n = siz;
  42
  43         /* Copy as many bytes as will fit */
  44         if (n != 0 && --n != 0) {
  45                 do {
  46                         if ((*d++ = *s++) == 0)
  47                                 break;
  48                 } while (--n != 0);
  49         }
  50
  51         /* Not enough room in dst, add NUL and traverse rest of src */
  52         if (n == 0) {
  53                 if (siz != 0)
  54                         *d = '\0';              /* NUL-terminate dst */
  55                 while (*s++)
  56                         ;
  57         }
  58
  59         return(s - src - 1);    /* count does not include NUL */
  60 }
  61
  62 #endif /* !HAVE_STRLCPY */