spoon

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Log | Files | Refs | LICENSE

strlcat.c (1697B)


      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  * Appends src to string dst of size dsize (unlike strncat, dsize is the
     24  * full size of dst, not space left).  At most dsize-1 characters
     25  * will be copied.  Always NUL terminates (unless dsize <= strlen(dst)).
     26  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
     27  * If retval >= dsize, truncation occurred.
     28  */
     29 size_t
     30 strlcat(char *dst, const char *src, size_t dsize)
     31 {
     32 	const char *odst = dst;
     33 	const char *osrc = src;
     34 	size_t n = dsize;
     35 	size_t dlen;
     36 
     37 	/* Find the end of dst and adjust bytes left but don't go past end. */
     38 	while (n-- != 0 && *dst != '\0')
     39 		dst++;
     40 	dlen = dst - odst;
     41 	n = dsize - dlen;
     42 
     43 	if (n-- == 0)
     44 		return(dlen + strlen(src));
     45 	while (*src != '\0') {
     46 		if (n != 0) {
     47 			*dst++ = *src;
     48 			n--;
     49 		}
     50 		src++;
     51 	}
     52 	*dst = '\0';
     53 
     54 	return(dlen + (src - osrc));	/* count does not include NUL */
     55 }