stagit

My personal build of stagit

strlcat.c (1767B)

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