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Log | Files | Refs | LICENSE

strlcpy.c (1550B)


      1 /*
      2  * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
      3  *
      4  * Permission to use, copy, modify, and distribute this software for any
      5  * purpose with or without fee is hereby granted, provided that the above
      6  * copyright notice and this permission notice appear in all copies.
      7  *
      8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15  */
     16 
     17 #include <sys/types.h>
     18 #include <string.h>
     19 
     20 #include "util.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 }