projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9385eb3d A |
1 | /* $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $ */ |
| 2 | ||
| 5b2abdfb A |
3 | /* |
| 4 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> | |
| 5 | * All rights reserved. | |
| 6 | * | |
| 7 | * Redistribution and use in source and binary forms, with or without | |
| 8 | * modification, are permitted provided that the following conditions | |
| 9 | * are met: | |
| 10 | * 1. Redistributions of source code must retain the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer. | |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 13 | * notice, this list of conditions and the following disclaimer in the | |
| 14 | * documentation and/or other materials provided with the distribution. | |
| 15 | * 3. The name of the author may not be used to endorse or promote products | |
| 16 | * derived from this software without specific prior written permission. | |
| 17 | * | |
| 18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
| 19 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | |
| 20 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL | |
| 21 | * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 22 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 23 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 24 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 25 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 26 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 27 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 28 | */ | |
| 29 | ||
| 30 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 3d9156a7 | 31 | static char *rcsid = "$OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $"; |
| 5b2abdfb | 32 | #endif /* LIBC_SCCS and not lint */ |
| 9385eb3d | 33 | #include <sys/cdefs.h> |
| 3d9156a7 | 34 | __FBSDID("$FreeBSD: src/lib/libc/string/strlcat.c,v 1.10 2004/10/16 06:32:43 obrien Exp $"); |
| 5b2abdfb A |
35 | |
| 36 | #include <sys/types.h> | |
| 37 | #include <string.h> | |
| 38 | ||
| 39 | /* | |
| 40 | * Appends src to string dst of size siz (unlike strncat, siz is the | |
| 41 | * full size of dst, not space left). At most siz-1 characters | |
| 42 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). | |
| 9385eb3d A |
43 | * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
| 44 | * If retval >= siz, truncation occurred. | |
| 5b2abdfb | 45 | */ |
| 9385eb3d A |
46 | size_t |
| 47 | strlcat(dst, src, siz) | |
| 5b2abdfb A |
48 | char *dst; |
| 49 | const char *src; | |
| 50 | size_t siz; | |
| 51 | { | |
| 9385eb3d A |
52 | char *d = dst; |
| 53 | const char *s = src; | |
| 54 | size_t n = siz; | |
| 5b2abdfb A |
55 | size_t dlen; |
| 56 | ||
| 57 | /* Find the end of dst and adjust bytes left but don't go past end */ | |
| 58 | while (n-- != 0 && *d != '\0') | |
| 59 | d++; | |
| 60 | dlen = d - dst; | |
| 61 | n = siz - dlen; | |
| 62 | ||
| 63 | if (n == 0) | |
| 64 | return(dlen + strlen(s)); | |
| 65 | while (*s != '\0') { | |
| 66 | if (n != 1) { | |
| 67 | *d++ = *s; | |
| 68 | n--; | |
| 69 | } | |
| 70 | s++; | |
| 71 | } | |
| 72 | *d = '\0'; | |
| 73 | ||
| 74 | return(dlen + (s - src)); /* count does not include NUL */ | |
| 75 | } |