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

   1 /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
   2
   3 /*      $OpenBSD: strlcat.c,v 1.11 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_STRLCAT
  23
  24 #if defined(LIBC_SCCS) && !defined(lint)
  25 static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 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  * Appends src to string dst of size siz (unlike strncat, siz is the
  33  * full size of dst, not space left).  At most siz-1 characters
  34  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
  35  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
  36  * If retval >= siz, truncation occurred.
  37  */
  38 size_t
  39 strlcat(char *dst, const char *src, size_t siz)
  40 {
  41         register char *d = dst;
  42         register const char *s = src;
  43         register size_t n = siz;
  44         size_t dlen;
  45
  46         /* Find the end of dst and adjust bytes left but don't go past end */
  47         while (n-- != 0 && *d != '\0')
  48                 d++;
  49         dlen = d - dst;
  50         n = siz - dlen;
  51
  52         if (n == 0)
  53                 return(dlen + strlen(s));
  54         while (*s != '\0') {
  55                 if (n != 1) {
  56                         *d++ = *s;
  57                         n--;
  58                 }
  59                 s++;
  60         }
  61         *d = '\0';
  62
  63         return(dlen + (s - src));       /* count does not include NUL */
  64 }
  65
  66 #endif /* !HAVE_STRLCAT */