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strlcpy.c (1620B)


      1 #ifndef __OpenBSD__
      2 /*	$OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
      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 <sys/types.h>
     21 #include <string.h>
     22 
     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