56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* Appends src to string dst of size siz (unlike strncat, siz is the
|
|
* full size of dst, not space left). At most siz-1 characters
|
|
* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
|
|
* Returns strlen(src) + MIN(siz, strlen(initial dst)).
|
|
* If retval >= siz, truncation occurred.
|
|
*/
|
|
size_t
|
|
strlcat(char *dst, const char *src, size_t siz)
|
|
{
|
|
char *d = dst;
|
|
const char *s = src;
|
|
size_t n = siz;
|
|
size_t dlen;
|
|
|
|
/* Find the end of dst and adjust bytes left but don't go past end */
|
|
while (n-- != 0 && *d != '\0')
|
|
d++;
|
|
dlen = d - dst;
|
|
n = siz - dlen;
|
|
|
|
if (n == 0)
|
|
return(dlen + strlen(s));
|
|
while (*s != '\0') {
|
|
if (n != 1) {
|
|
*d++ = *s;
|
|
n--;
|
|
}
|
|
s++;
|
|
}
|
|
*d = '\0';
|
|
|
|
return(dlen + (s - src)); /* count does not include NUL */
|
|
}
|