| 1 | /* $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1998 Todd C. Miller <[email protected]>
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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| 19 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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| 20 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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| 21 | * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 22 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 23 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 24 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 25 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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| 26 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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| 27 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | #if defined(LIBC_SCCS) && !defined(lint)
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| 31 | static char *rcsid = "$OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $");
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| 32 | #include <sys/cdefs.h>
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| 33 | //__FBSDID("$FreeBSD: src/lib/libc/string/strlcpy.c,v 1.7 2003/05/01 19:03:14 nectar Exp $");
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| 34 | #endif /* LIBC_SCCS and not lint */
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| 35 |
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| 36 | #include <sys/types.h>
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| 37 | #include <string.h>
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| 38 |
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| 39 | /*
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| 40 | * Copy src to string dst of size siz. At most siz-1 characters
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| 41 | * will be copied. Always NUL terminates (unless siz == 0).
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| 42 | * Returns strlen(src); if retval >= siz, truncation occurred.
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| 43 | */
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| 44 | size_t strlcpy(dst, src, siz)
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| 45 | char *dst;
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| 46 | const char *src;
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| 47 | size_t siz;
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| 48 | {
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| 49 | char *d = dst;
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| 50 | const char *s = src;
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| 51 | size_t n = siz;
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| 52 |
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| 53 | /* Copy as many bytes as will fit */
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| 54 | if (n != 0 && --n != 0) {
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| 55 | do {
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| 56 | if ((*d++ = *s++) == 0)
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| 57 | break;
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| 58 | } while (--n != 0);
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| 59 | }
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| 60 |
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| 61 | /* Not enough room in dst, add NUL and traverse rest of src */
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| 62 | if (n == 0) {
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| 63 | if (siz != 0)
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| 64 | *d = '\0'; /* NUL-terminate dst */
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| 65 | while (*s++)
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| 66 | ;
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| 67 | }
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| 68 |
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| 69 | return(s - src - 1); /* count does not include NUL */
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| 70 | }
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