| 1 | /* $NetBSD: strlcat.c,v 1.3 2007/06/04 18:19:27 christos Exp $ */
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| 2 | /* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */
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| 3 |
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| 4 | /*
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| 5 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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| 6 | *
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| 7 | * Permission to use, copy, modify, and distribute this software for any
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| 8 | * purpose with or without fee is hereby granted, provided that the above
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| 9 | * copyright notice and this permission notice appear in all copies.
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| 10 | *
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| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
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| 12 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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| 13 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
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| 14 | * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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| 16 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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| 17 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 18 | */
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| 19 |
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| 20 | #include "config.h"
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| 21 |
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| 22 | #if defined(LIBC_SCCS) && !defined(lint)
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| 23 | __RCSID("$NetBSD: strlcat.c,v 1.3 2007/06/04 18:19:27 christos Exp $");
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| 24 | #endif /* LIBC_SCCS and not lint */
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| 25 |
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| 26 | #include <sys/types.h>
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| 27 | #include <assert.h>
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| 28 | #include <string.h>
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| 29 |
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| 30 | #ifdef _LIBC
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| 31 | # ifdef __weak_alias
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| 32 | __weak_alias(strlcat, _strlcat)
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| 33 | # endif
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| 34 | #endif
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| 35 |
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| 36 | #if !HAVE_STRLCAT
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| 37 | /*
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| 38 | * Appends src to string dst of size siz (unlike strncat, siz is the
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| 39 | * full size of dst, not space left). At most siz-1 characters
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| 40 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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| 41 | * Returns strlen(src) + MIN(siz, strlen(initial dst)).
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| 42 | * If retval >= siz, truncation occurred.
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| 43 | */
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| 44 | size_t
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| 45 | strlcat(char *dst, const char *src, size_t siz)
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| 46 | {
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| 47 | char *d = dst;
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| 48 | const char *s = src;
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| 49 | size_t n = siz;
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| 50 | size_t dlen;
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| 51 |
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| 52 | _DIAGASSERT(dst != NULL);
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| 53 | _DIAGASSERT(src != NULL);
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| 54 |
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| 55 | /* Find the end of dst and adjust bytes left but don't go past end */
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| 56 | while (n-- != 0 && *d != '\0')
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| 57 | d++;
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| 58 | dlen = d - dst;
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| 59 | n = siz - dlen;
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| 60 |
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| 61 | if (n == 0)
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| 62 | return(dlen + strlen(s));
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| 63 | while (*s != '\0') {
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| 64 | if (n != 1) {
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| 65 | *d++ = *s;
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| 66 | n--;
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| 67 | }
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| 68 | s++;
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| 69 | }
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| 70 | *d = '\0';
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| 71 |
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| 72 | return(dlen + (s - src)); /* count does not include NUL */
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| 73 | }
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| 74 | #endif
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