Commit | Line | Data |
---|---|---|
a09e091a JB |
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 | */ | |
32 | size_t | |
33 | strlcat(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 | } |