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libite

    1: /*	$OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 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 strlcat
   23: /*
   24:  * Appends src to string dst of size dsize (unlike strncat, dsize is the
   25:  * full size of dst, not space left).  At most dsize-1 characters
   26:  * will be copied.  Always NUL terminates (unless dsize <= strlen(dst)).
   27:  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
   28:  * If retval >= dsize, truncation occurred.
   29:  */
   30: size_t
   31: strlcat(char *dst, const char *src, size_t dsize)
   32: {
   33: 	const char *odst = dst;
   34: 	const char *osrc = src;
   35: 	size_t n = dsize;
   36: 	size_t dlen;
   37: 
   38: 	/* Find the end of dst and adjust bytes left but don't go past end. */
   39: 	while (n-- != 0 && *dst != '\0')
   40: 		dst++;
   41: 	dlen = dst - odst;
   42: 	n = dsize - dlen;
   43: 
   44: 	if (n-- == 0)
   45: 		return(dlen + strlen(src));
   46: 	while (*src != '\0') {
   47: 		if (n != 0) {
   48: 			*dst++ = *src;
   49: 			n--;
   50: 		}
   51: 		src++;
   52: 	}
   53: 	*dst = '\0';
   54: 
   55: 	return(dlen + (src - osrc));	/* count does not include NUL */
   56: }
   57: #endif