cwm/strlcat.c

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/* $OpenBSD: strlcat.c,v 1.14 2015/01/15 03:54:12 millert Exp $ */
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/*
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* Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
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*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
#include <sys/types.h>
#include <string.h>
#include "calmwm.h"
#ifndef HAVE_STRLCAT
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/*
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* Appends src to string dst of size dsize (unlike strncat, dsize is the
* full size of dst, not space left). At most dsize-1 characters
* will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
* Returns strlen(src) + MIN(dsize, strlen(initial dst)).
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* If retval >= siz, truncation occurred.
*/
size_t
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strlcat(char *dst, const char *src, size_t dsize)
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{
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const char *odst = dst;
const char *osrc = src;
size_t n = dsize;
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size_t dlen;
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/* Find the end of dst and adjust bytes left but don't go past end. */
while (n-- != 0 && *dst != '\0')
dst++;
dlen = dst - odst;
n = dsize - dlen;
if (n-- == 0)
return(dlen + strlen(src));
while (*src != '\0') {
if (n != 0) {
*dst++ = *src;
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n--;
}
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src++;
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}
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*dst = '\0';
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return(dlen + (src - osrc)); /* count does not include NUL */
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}
#endif /* !HAVE_STRLCAT */