1 |
|
|
/* $OpenBSD: strlcat.c,v 1.18 2016/10/16 17:37:39 dtucker 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 |
|
|
/* |
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 |
|
|
} |
56 |
|
|
DEF_WEAK(strlcat); |