1*6d38604fSBaptiste Daroussin /* $Id: compat_strlcat.c,v 1.6 2020/06/15 20:49:57 schwarze Exp $ */
2*6d38604fSBaptiste Daroussin /* $OpenBSD: strlcat.c,v 1.19 2019/01/25 00:19:25 millert Exp $ */
361d06d6bSBaptiste Daroussin
461d06d6bSBaptiste Daroussin /*
5*6d38604fSBaptiste Daroussin * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
661d06d6bSBaptiste Daroussin *
761d06d6bSBaptiste Daroussin * Permission to use, copy, modify, and distribute this software for any
861d06d6bSBaptiste Daroussin * purpose with or without fee is hereby granted, provided that the above
961d06d6bSBaptiste Daroussin * copyright notice and this permission notice appear in all copies.
1061d06d6bSBaptiste Daroussin *
1161d06d6bSBaptiste Daroussin * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
1261d06d6bSBaptiste Daroussin * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
1361d06d6bSBaptiste Daroussin * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
1461d06d6bSBaptiste Daroussin * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
1561d06d6bSBaptiste Daroussin * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
1661d06d6bSBaptiste Daroussin * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1761d06d6bSBaptiste Daroussin * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1861d06d6bSBaptiste Daroussin */
19*6d38604fSBaptiste Daroussin #include "config.h"
2061d06d6bSBaptiste Daroussin
2161d06d6bSBaptiste Daroussin #include <sys/types.h>
2261d06d6bSBaptiste Daroussin #include <string.h>
2361d06d6bSBaptiste Daroussin
2461d06d6bSBaptiste Daroussin /*
25*6d38604fSBaptiste Daroussin * Appends src to string dst of size dsize (unlike strncat, dsize is the
26*6d38604fSBaptiste Daroussin * full size of dst, not space left). At most dsize-1 characters
27*6d38604fSBaptiste Daroussin * will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
28*6d38604fSBaptiste Daroussin * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
29*6d38604fSBaptiste Daroussin * If retval >= dsize, truncation occurred.
3061d06d6bSBaptiste Daroussin */
3161d06d6bSBaptiste Daroussin size_t
strlcat(char * dst,const char * src,size_t dsize)32*6d38604fSBaptiste Daroussin strlcat(char *dst, const char *src, size_t dsize)
3361d06d6bSBaptiste Daroussin {
34*6d38604fSBaptiste Daroussin const char *odst = dst;
35*6d38604fSBaptiste Daroussin const char *osrc = src;
36*6d38604fSBaptiste Daroussin size_t n = dsize;
3761d06d6bSBaptiste Daroussin size_t dlen;
3861d06d6bSBaptiste Daroussin
39*6d38604fSBaptiste Daroussin /* Find the end of dst and adjust bytes left but don't go past end. */
40*6d38604fSBaptiste Daroussin while (n-- != 0 && *dst != '\0')
41*6d38604fSBaptiste Daroussin dst++;
42*6d38604fSBaptiste Daroussin dlen = dst - odst;
43*6d38604fSBaptiste Daroussin n = dsize - dlen;
4461d06d6bSBaptiste Daroussin
45*6d38604fSBaptiste Daroussin if (n-- == 0)
46*6d38604fSBaptiste Daroussin return(dlen + strlen(src));
47*6d38604fSBaptiste Daroussin while (*src != '\0') {
48*6d38604fSBaptiste Daroussin if (n != 0) {
49*6d38604fSBaptiste Daroussin *dst++ = *src;
5061d06d6bSBaptiste Daroussin n--;
5161d06d6bSBaptiste Daroussin }
52*6d38604fSBaptiste Daroussin src++;
5361d06d6bSBaptiste Daroussin }
54*6d38604fSBaptiste Daroussin *dst = '\0';
5561d06d6bSBaptiste Daroussin
56*6d38604fSBaptiste Daroussin return(dlen + (src - osrc)); /* count does not include NUL */
5761d06d6bSBaptiste Daroussin }
58