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libite

    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 <Todd.Miller@courtesan.com>
    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 WARRANTIES
   11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   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 OF
   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: #ifndef strlcpy
   23: /*
   24:  * Copy string src to buffer dst of size dsize.  At most dsize-1
   25:  * chars will be copied.  Always NUL terminates (unless dsize == 0).
   26:  * Returns strlen(src); if retval >= dsize, truncation occurred.
   27:  */
   28: size_t
   29: strlcpy(char *dst, const char *src, size_t dsize)
   30: {
   31: 	const char *osrc = src;
   32: 	size_t nleft = dsize;
   33: 
   34: 	/* Copy as many bytes as will fit. */
   35: 	if (nleft != 0) {
   36: 		while (--nleft != 0) {
   37: 			if ((*dst++ = *src++) == '\0')
   38: 				break;
   39: 		}
   40: 	}
   41: 
   42: 	/* Not enough room in dst, add NUL and traverse rest of src. */
   43: 	if (nleft == 0) {
   44: 		if (dsize != 0)
   45: 			*dst = '\0';		/* NUL-terminate dst */
   46: 		while (*src++)
   47: 			;
   48: 	}
   49: 
   50: 	return(src - osrc - 1);	/* count does not include NUL */
   51: }
   52: #endif