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contrib/libdiff/compat/strlcat.c
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/* $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 */ | |||||
} |