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    1: /*	$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $	*/
    2: 
    3: /*
    4:  * Copyright (c) 1998, 2003-2005, 2010-2011
    5:  *	Todd C. Miller <Todd.Miller@courtesan.com>
    6:  *
    7:  * Permission to use, copy, modify, and distribute this software for any
    8:  * purpose with or without fee is hereby granted, provided that the above
    9:  * copyright notice and this permission notice appear in all copies.
   10:  *
   11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   17:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   18:  */
   19: 
   20: #include <config.h>
   21: 
   22: #include <sys/types.h>
   23: 
   24: #include "missing.h"
   25: 
   26: /*
   27:  * Copy src to string dst of size siz.  At most siz-1 characters
   28:  * will be copied.  Always NUL terminates (unless siz == 0).
   29:  * Returns strlen(src); if retval >= siz, truncation occurred.
   30:  */
   31: size_t
   32: strlcpy(char *dst, const char *src, size_t siz)
   33: {
   34: 	char *d = dst;
   35: 	const char *s = src;
   36: 	size_t n = siz;
   37: 
   38: 	/* Copy as many bytes as will fit */
   39: 	if (n != 0 && --n != 0) {
   40: 		do {
   41: 			if ((*d++ = *s++) == 0)
   42: 				break;
   43: 		} while (--n != 0);
   44: 	}
   45: 
   46: 	/* Not enough room in dst, add NUL and traverse rest of src */
   47: 	if (n == 0) {
   48: 		if (siz != 0)
   49: 			*d = '\0';		/* NUL-terminate dst */
   50: 		while (*s++)
   51: 			;
   52: 	}
   53: 
   54: 	return s - src - 1;	/* count does not include NUL */
   55: }