1/*
2 * Copyright (c) 1998 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 TODD C. MILLER DISCLAIMS ALL
9 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
11 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#ifdef HAVE_DIX_CONFIG_H
18#include <dix-config.h>
19#endif
20
21#include <sys/types.h>
22#include <string.h>
23#include "os.h"
24
25/*
26 * Appends src to string dst of size siz (unlike strncat, siz is the
27 * full size of dst, not space left).  At most siz-1 characters
28 * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
29 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
30 * If retval >= siz, truncation occurred.
31 */
32size_t
33strlcat(char *dst, const char *src, size_t siz)
34{
35    register char *d = dst;
36    register const char *s = src;
37    register size_t n = siz;
38    size_t dlen;
39
40    /* Find the end of dst and adjust bytes left but don't go past end */
41    while (n-- != 0 && *d != '\0')
42        d++;
43    dlen = d - dst;
44    n = siz - dlen;
45
46    if (n == 0)
47        return (dlen + strlen(s));
48    while (*s != '\0') {
49        if (n != 1) {
50            *d++ = *s;
51            n--;
52        }
53        s++;
54    }
55    *d = '\0';
56
57    return (dlen + (s - src));  /* count does not include NUL */
58}
59