projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5b2abdfb A |
1 | /* $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 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) | |
| 9385eb3d | 31 | static char *rcsid = "$OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $"); |
| 5b2abdfb | 32 | #endif /* LIBC_SCCS and not lint */ |
| 9385eb3d A |
33 | #include <sys/cdefs.h> |
| 34 | __FBSDID("$FreeBSD: src/lib/libc/string/strlcpy.c,v 1.5 2002/03/21 18:44:54 obrien Exp $"); | |
| 5b2abdfb A |
35 | |
| 36 | #include <sys/types.h> | |
| 37 | #include <string.h> | |
| 38 | ||
| 39 | /* | |
| 40 | * Copy src to string dst of size siz. At most siz-1 characters | |
| 41 | * will be copied. Always NUL terminates (unless siz == 0). | |
| 42 | * Returns strlen(src); if retval >= siz, truncation occurred. | |
| 43 | */ | |
| 44 | size_t strlcpy(dst, src, siz) | |
| 45 | char *dst; | |
| 46 | const char *src; | |
| 47 | size_t siz; | |
| 48 | { | |
| 9385eb3d A |
49 | char *d = dst; |
| 50 | const char *s = src; | |
| 51 | size_t n = siz; | |
| 5b2abdfb A |
52 | |
| 53 | /* Copy as many bytes as will fit */ | |
| 54 | if (n != 0 && --n != 0) { | |
| 55 | do { | |
| 56 | if ((*d++ = *s++) == 0) | |
| 57 | break; | |
| 58 | } while (--n != 0); | |
| 59 | } | |
| 60 | ||
| 61 | /* Not enough room in dst, add NUL and traverse rest of src */ | |
| 62 | if (n == 0) { | |
| 63 | if (siz != 0) | |
| 64 | *d = '\0'; /* NUL-terminate dst */ | |
| 65 | while (*s++) | |
| 66 | ; | |
| 67 | } | |
| 68 | ||
| 69 | return(s - src - 1); /* count does not include NUL */ | |
| 70 | } |