| 1 | /* $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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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: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $");
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| 32 | #endif /* LIBC_SCCS and not lint */
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| 33 | #include <sys/cdefs.h>
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| 34 | __FBSDID("$FreeBSD: src/lib/libc/string/strlcat.c,v 1.9 2003/05/01 19:03:14 nectar Exp $");
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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 | * Appends src to string dst of size siz (unlike strncat, siz is the
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| 41 | * full size of dst, not space left). At most siz-1 characters
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| 42 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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| 43 | * Returns strlen(src) + MIN(siz, strlen(initial dst)).
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| 44 | * If retval >= siz, truncation occurred.
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| 45 | */
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| 46 | size_t
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| 47 | strlcat(dst, src, siz)
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| 48 | char *dst;
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| 49 | const char *src;
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| 50 | size_t siz;
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| 51 | {
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| 52 | char *d = dst;
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| 53 | const char *s = src;
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| 54 | size_t n = siz;
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| 55 | size_t dlen;
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| 56 |
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| 57 | /* Find the end of dst and adjust bytes left but don't go past end */
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| 58 | while (n-- != 0 && *d != '\0')
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| 59 | d++;
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| 60 | dlen = d - dst;
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| 61 | n = siz - dlen;
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| 62 |
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| 63 | if (n == 0)
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| 64 | return(dlen + strlen(s));
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| 65 | while (*s != '\0') {
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| 66 | if (n != 1) {
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| 67 | *d++ = *s;
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| 68 | n--;
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| 69 | }
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| 70 | s++;
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| 71 | }
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| 72 | *d = '\0';
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| 73 |
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| 74 | return(dlen + (s - src)); /* count does not include NUL */
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| 75 | }
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