1 /*
2  * Copyright (C) 2002     Manuel Novoa III
3  * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
4  *
5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
6  */
7 
8 /* OpenBSD function:
9  * Append at most n-1-strlen(dst) chars from src to dst and nul-terminate dst.
10  * Returns strlen(src) + strlen({original} dst), so truncation occurred if the
11  * return val is >= n.
12  * Note: If dst doesn't contain a nul in the first n chars, strlen(dst) is
13  *       taken as n. */
14 
15 #include "_string.h"
16 
strlcat(register char * __restrict dst,register const char * __restrict src,size_t n)17 size_t strlcat(register char *__restrict dst,
18 			   register const char *__restrict src,
19 			   size_t n)
20 {
21 	size_t len;
22 	char dummy[1];
23 
24 	len = 0;
25 
26 	while (1) {
27 		if (len >= n) {
28 			dst = dummy;
29 			break;
30 		}
31 		if (!*dst) {
32 			break;
33 		}
34 		++dst;
35 		++len;
36 	}
37 
38 	while ((*dst = *src) != 0) {
39 		if (++len < n) {
40 			++dst;
41 		}
42 		++src;
43 	}
44 
45 	return len;
46 }
47 libc_hidden_def(strlcat)
48