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	---
	tstrlcat.c (1767B)
	---
	1 /* $OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $ …
	2
	3 /*
	4 * Copyright (c) 1998, 2015 Todd C. Miller <[email protected]>
	5 *
	6 * Permission to use, copy, modify, and distribute this software for any
	7 * purpose with or without fee is hereby granted, provided that the above
	8 * copyright notice and this permission notice appear in all copies.
	9 *
	10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANT…
	11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE F…
	13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT …
	16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	17 */
	18
	19 #include <sys/types.h>
	20 #include <string.h>
	21
	22 #include "compat.h"
	23
	24 /*
	25 * Appends src to string dst of size dsize (unlike strncat, dsize is the
	26 * full size of dst, not space left). At most dsize-1 characters
	27 * will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
	28 * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
	29 * If retval >= dsize, truncation occurred.
	30 */
	31 size_t
	32 strlcat(char dst, const char src, size_t dsize)
	33 {
	34 const char *odst = dst;
	35 const char *osrc = src;
	36 size_t n = dsize;
	37 size_t dlen;
	38
	39 /* Find the end of dst and adjust bytes left but don't go past e…
	40 while (n-- != 0 && *dst != '\0')
	41 dst++;
	42 dlen = dst - odst;
	43 n = dsize - dlen;
	44
	45 if (n-- == 0)
	46 return(dlen + strlen(src));
	47 while (*src != '\0') {
	48 if (n != 0) {
	49 dst++ = src;
	50 n--;
	51 }
	52 src++;
	53 }
	54 *dst = '\0';
	55
	56 return(dlen + (src - osrc)); /* count does not include NU…
	57 }