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	strlcpy.c (1599B)
	---
	1 /* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 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 /*
	23 * Copy string src to buffer dst of size dsize. At most dsize-1
	24 * chars will be copied. Always NUL terminates (unless dsize == 0).
	25 * Returns strlen(src); if retval >= dsize, truncation occurred.
	26 */
	27 size_t
	28 strlcpy(char dst, const char src, size_t dsize)
	29 {
	30 const char *osrc = src;
	31 size_t nleft = dsize;
	32
	33 /* Copy as many bytes as will fit. */
	34 if (nleft != 0) {
	35 while (--nleft != 0) {
	36 if ((dst++ = src++) == '\0')
	37 break;
	38 }
	39 }
	40
	41 /* Not enough room in dst, add NUL and traverse rest of src. */
	42 if (nleft == 0) {
	43 if (dsize != 0)
	44 dst = '\0'; / NUL-terminate dst…
	45 while (*src++)
	46 ;
	47 }
	48
	49 return(src - osrc - 1); /* count does not include NUL */
	50 }