56 lines
1.7 KiB
C
Executable File
56 lines
1.7 KiB
C
Executable File
/* $OpenBSD: strlcat.c,v 1.19 2019/01/25 00:19:25 millert Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
|
|
*
|
|
* 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 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)).
|
|
* If retval >= dsize, truncation occurred.
|
|
*/
|
|
size_t
|
|
strlcat(char *dst, const char *src, size_t dsize)
|
|
{
|
|
const char *odst = dst;
|
|
const char *osrc = src;
|
|
size_t n = dsize;
|
|
size_t dlen;
|
|
|
|
/* 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;
|
|
n--;
|
|
}
|
|
src++;
|
|
}
|
|
*dst = '\0';
|
|
|
|
return(dlen + (src - osrc)); /* count does not include NUL */
|
|
}
|