strlcat.c

00001 /*  $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $  */
00002 
00003 /*
00004  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
00005  *
00006  * Permission to use, copy, modify, and distribute this software for any
00007  * purpose with or without fee is hereby granted, provided that the above
00008  * copyright notice and this permission notice appear in all copies.
00009  *
00010  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
00011  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
00012  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
00013  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
00014  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
00015  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
00016  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00017  */
00018 
00019 #ifdef HAVE_CONFIG_H
00020 #include "config.h"
00021 #endif
00022 
00023 #ifndef HAVE_STRLCPY
00024 
00025 #include <sys/types.h>
00026 #include <string.h>
00027 #include "strlcpycat.h"
00028 
00029 /*
00030  * Appends src to string dst of size siz (unlike strncat, siz is the
00031  * full size of dst, not space left).  At most siz-1 characters
00032  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
00033  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
00034  * If retval >= siz, truncation occurred.
00035  */
00036 size_t
00037 strlcat(char *dst, const char *src, 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 #endif

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