| bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 1 | /* $OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $ */ |
| 2 | |
| 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) |
| 31 | static char *rcsid = "$OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $"; |
| 32 | #endif /* LIBC_SCCS and not lint */ |
| 33 | |
| 34 | #include <sys/types.h> |
| 35 | #include <string.h> |
| 36 | |
| 37 | /* |
| 38 | * Appends src to string dst of size siz (unlike strncat, siz is the |
| 39 | * full size of dst, not space left). At most siz-1 characters |
| 40 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
| 41 | * Returns strlen(initial dst) + strlen(src); if retval >= siz, |
| 42 | * truncation occurred. |
| 43 | */ |
| 44 | size_t strlcat(dst, src, siz) |
| 45 | char *dst; |
| 46 | const char *src; |
| 47 | size_t siz; |
| 48 | { |
| 49 | register char *d = dst; |
| 50 | register const char *s = src; |
| 51 | register size_t n = siz; |
| 52 | size_t dlen; |
| 53 | |
| 54 | /* Find the end of dst and adjust bytes left but don't go past end */ |
| 55 | while (n-- != 0 && *d != '\0') |
| 56 | d++; |
| 57 | dlen = d - dst; |
| 58 | n = siz - dlen; |
| 59 | |
| 60 | if (n == 0) |
| 61 | return(dlen + strlen(s)); |
| 62 | while (*s != '\0') { |
| 63 | if (n != 1) { |
| 64 | *d++ = *s; |
| 65 | n--; |
| 66 | } |
| 67 | s++; |
| 68 | } |
| 69 | *d = '\0'; |
| 70 | |
| 71 | return(dlen + (s - src)); /* count does not include NUL */ |
| 72 | } |