| /* $NetBSD: strlcat.c,v 1.4 2013/01/23 07:57:27 matt Exp $ */ |
| /* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */ |
| |
| /* |
| * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL |
| * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE |
| * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #include "config.h" |
| |
| #if defined(LIBC_SCCS) && !defined(lint) |
| __RCSID("$NetBSD: strlcat.c,v 1.4 2013/01/23 07:57:27 matt Exp $"); |
| #endif /* LIBC_SCCS and not lint */ |
| |
| #include <sys/types.h> |
| #include <assert.h> |
| #include <string.h> |
| |
| #ifdef _LIBC |
| # ifdef __weak_alias |
| __weak_alias(strlcat, _strlcat) |
| # endif |
| #endif |
| |
| #if !HAVE_STRLCAT |
| /* |
| * Appends src to string dst of size siz (unlike strncat, siz is the |
| * full size of dst, not space left). At most siz-1 characters |
| * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
| * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
| * If retval >= siz, truncation occurred. |
| */ |
| size_t |
| strlcat(char *dst, const char *src, size_t siz) |
| { |
| #if 1 |
| char *d = dst; |
| const char *s = src; |
| size_t n = siz; |
| size_t dlen; |
| |
| _DIAGASSERT(dst != NULL); |
| _DIAGASSERT(src != NULL); |
| |
| /* Find the end of dst and adjust bytes left but don't go past end */ |
| while (n-- != 0 && *d != '\0') |
| d++; |
| dlen = d - dst; |
| n = siz - dlen; |
| |
| if (n == 0) |
| return(dlen + strlen(s)); |
| while (*s != '\0') { |
| if (n != 1) { |
| *d++ = *s; |
| n--; |
| } |
| s++; |
| } |
| *d = '\0'; |
| |
| return(dlen + (s - src)); /* count does not include NUL */ |
| #else |
| _DIAGASSERT(dst != NULL); |
| _DIAGASSERT(src != NULL); |
| |
| /* |
| * Find length of string in dst (maxing out at siz). |
| */ |
| size_t dlen = strnlen(dst, siz); |
| |
| /* |
| * Copy src into any remaining space in dst (truncating if needed). |
| * Note strlcpy(dst, src, 0) returns strlen(src). |
| */ |
| return dlen + strlcpy(dst + dlen, src, siz - dlen); |
| #endif |
| } |
| #endif |