mksh/strlcpy.c

54 lines
1.6 KiB
C

/*-
* Copyright (c) 2006, 2008, 2009, 2013
* Thorsten Glaser <tg@mirbsd.org>
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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 "sh.h"
__RCSID("$MirOS: src/bin/mksh/strlcpy.c,v 1.8 2013/11/05 22:10:15 tg Exp $");
/*
* Copy src to string dst of size siz. At most siz-1 characters
* will be copied. Always NUL terminates (unless siz == 0).
* Returns strlen(src); if retval >= siz, truncation occurred.
*/
#undef strlcpy
size_t
strlcpy(char *dst, const char *src, size_t siz)
{
const char *s = src;
if (siz == 0)
goto traverse_src;
/* copy as many chars as will fit */
while (--siz && (*dst++ = *s++))
;
/* not enough room in dst */
if (siz == 0) {
/* safe to NUL-terminate dst since we copied <= siz-1 chars */
*dst = '\0';
traverse_src:
/* traverse rest of src */
while (*s++)
;
}
/* count does not include NUL */
return ((size_t)(s - src - 1));
}