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strlcat.c

00001 /*      $NetBSD: strlcat.c,v 1.16 2003/10/27 00:12:42 lukem Exp $       */
00002 /*      $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $    */
00003 
00004 /*
00005  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
00006  *
00007  * Permission to use, copy, modify, and distribute this software for any
00008  * purpose with or without fee is hereby granted, provided that the above
00009  * copyright notice and this permission notice appear in all copies.
00010  *
00011  * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
00012  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
00013  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
00014  * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
00015  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
00016  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
00017  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00018  */
00019 
00020 #include <u/libu_conf.h>
00021 #include <sys/types.h>
00022 #include <string.h>
00023 
00024 #ifndef HAVE_STRLCAT
00025 
00026 /*
00027  * Appends src to string dst of size siz (unlike strncat, siz is the
00028  * full size of dst, not space left).  At most siz-1 characters
00029  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
00030  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
00031  * If retval >= siz, truncation occurred.
00032  */
00033 size_t
00034 strlcat(dst, src, siz)
00035         char *dst;
00036         const char *src;
00037         size_t siz;
00038 {
00039         char *d = dst;
00040         const char *s = src;
00041         size_t n = siz;
00042         size_t dlen;
00043 
00044         /* Find the end of dst and adjust bytes left but don't go past end */
00045         while (n-- != 0 && *d != '\0')
00046                 d++;
00047         dlen = d - dst;
00048         n = siz - dlen;
00049 
00050         if (n == 0)
00051                 return(dlen + strlen(s));
00052         while (*s != '\0') {
00053                 if (n != 1) {
00054                         *d++ = *s;
00055                         n--;
00056                 }
00057                 s++;
00058         }
00059         *d = '\0';
00060 
00061         return(dlen + (s - src));       /* count does not include NUL */
00062 }
00063 #else
00064 size_t strlcat(char *, const char *, size_t);
00065 #endif

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