strlcat.c

00001 /*  $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert 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 #include "config.h"
00020 #ifndef HAVE_STRLCAT
00021 
00022 #if defined(LIBC_SCCS) && !defined(lint)
00023 static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $";
00024 #endif /* LIBC_SCCS and not lint */
00025 
00026 #include <sys/types.h>
00027 #include <string.h>
00028 #include "misc.h"
00029 
00030 /*
00031  * Appends src to string dst of size siz (unlike strncat, siz is the
00032  * full size of dst, not space left).  At most siz-1 characters
00033  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
00034  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
00035  * If retval >= siz, truncation occurred.
00036  */
00037 INTERNAL size_t
00038 strlcat(char *dst, const char *src, size_t siz)
00039 {
00040     register char *d = dst;
00041     register const char *s = src;
00042     register size_t n = siz;
00043     size_t dlen;
00044 
00045     /* Find the end of dst and adjust bytes left but don't go past end */
00046     while (n-- != 0 && *d != '\0')
00047         d++;
00048     dlen = d - dst;
00049     n = siz - dlen;
00050 
00051     if (n == 0)
00052         return(dlen + strlen(s));
00053     while (*s != '\0') {
00054         if (n != 1) {
00055             *d++ = *s;
00056             n--;
00057         }
00058         s++;
00059     }
00060     *d = '\0';
00061 
00062     return(dlen + (s - src));   /* count does not include NUL */
00063 }
00064 
00065 #endif
00066 

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