external/bsd/mdocml/dist/compat_strlcat.c

   1 #ifdef HAVE_CONFIG_H
   2 #include "config.h"
   3 #endif
   4
   5 #ifdef HAVE_STRLCAT
   6
   7 int dummy;
   8
   9 #else
  10
  11 /*      $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $      */
  12
  13 /*
  14  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  15  *
  16  * Permission to use, copy, modify, and distribute this software for any
  17  * purpose with or without fee is hereby granted, provided that the above
  18  * copyright notice and this permission notice appear in all copies.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  21  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  22  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  23  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  24  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  25  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  26  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  27  */
  28
  29 #include <sys/types.h>
  30 #include <string.h>
  31
  32 /*
  33  * Appends src to string dst of size siz (unlike strncat, siz is the
  34  * full size of dst, not space left).  At most siz-1 characters
  35  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
  36  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
  37  * If retval >= siz, truncation occurred.
  38  */
  39 size_t
  40 strlcat(char *dst, const char *src, size_t siz)
  41 {
  42         char *d = dst;
  43         const char *s = src;
  44         size_t n = siz;
  45         size_t dlen;
  46
  47         /* Find the end of dst and adjust bytes left but don't go past end */
  48         while (n-- != 0 && *d != '\0')
  49                 d++;
  50         dlen = d - dst;
  51         n = siz - dlen;
  52
  53         if (n == 0)
  54                 return(dlen + strlen(s));
  55         while (*s != '\0') {
  56                 if (n != 1) {
  57                         *d++ = *s;
  58                         n--;
  59                 }
  60                 s++;
  61         }
  62         *d = '\0';
  63
  64         return(dlen + (s - src));       /* count does not include NUL */
  65 }
  66
  67 #endif