| 1 | /* $NetBSD: strlcat.c,v 1.4 2013/01/23 07:57:27 matt Exp $ */ |
| 2 | /* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> |
| 6 | * |
| 7 | * Permission to use, copy, modify, and distribute this software for any |
| 8 | * purpose with or without fee is hereby granted, provided that the above |
| 9 | * copyright notice and this permission notice appear in all copies. |
| 10 | * |
| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL |
| 12 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| 13 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE |
| 14 | * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 16 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 17 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 18 | */ |
| 19 | |
| 20 | #if !defined(_KERNEL) && !defined(_STANDALONE) |
| 21 | #if HAVE_NBTOOL_CONFIG_H |
| 22 | #include "nbtool_config.h" |
| 23 | #endif |
| 24 | |
| 25 | #include <sys/cdefs.h> |
| 26 | #if defined(LIBC_SCCS) && !defined(lint) |
| 27 | __RCSID("$NetBSD: strlcat.c,v 1.4 2013/01/23 07:57:27 matt Exp $" ); |
| 28 | #endif /* LIBC_SCCS and not lint */ |
| 29 | |
| 30 | #ifdef _LIBC |
| 31 | #include "namespace.h" |
| 32 | #endif |
| 33 | #include <sys/types.h> |
| 34 | #include <assert.h> |
| 35 | #include <string.h> |
| 36 | |
| 37 | #ifdef _LIBC |
| 38 | # ifdef __weak_alias |
| 39 | __weak_alias(strlcat, _strlcat) |
| 40 | # endif |
| 41 | #endif |
| 42 | |
| 43 | #else |
| 44 | #include <lib/libkern/libkern.h> |
| 45 | #endif /* !_KERNEL && !_STANDALONE */ |
| 46 | |
| 47 | #if !HAVE_STRLCAT |
| 48 | /* |
| 49 | * Appends src to string dst of size siz (unlike strncat, siz is the |
| 50 | * full size of dst, not space left). At most siz-1 characters |
| 51 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
| 52 | * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
| 53 | * If retval >= siz, truncation occurred. |
| 54 | */ |
| 55 | size_t |
| 56 | strlcat(char *dst, const char *src, size_t siz) |
| 57 | { |
| 58 | #if 1 |
| 59 | char *d = dst; |
| 60 | const char *s = src; |
| 61 | size_t n = siz; |
| 62 | size_t dlen; |
| 63 | |
| 64 | _DIAGASSERT(dst != NULL); |
| 65 | _DIAGASSERT(src != NULL); |
| 66 | |
| 67 | /* Find the end of dst and adjust bytes left but don't go past end */ |
| 68 | while (n-- != 0 && *d != '\0') |
| 69 | d++; |
| 70 | dlen = d - dst; |
| 71 | n = siz - dlen; |
| 72 | |
| 73 | if (n == 0) |
| 74 | return(dlen + strlen(s)); |
| 75 | while (*s != '\0') { |
| 76 | if (n != 1) { |
| 77 | *d++ = *s; |
| 78 | n--; |
| 79 | } |
| 80 | s++; |
| 81 | } |
| 82 | *d = '\0'; |
| 83 | |
| 84 | return(dlen + (s - src)); /* count does not include NUL */ |
| 85 | #else |
| 86 | _DIAGASSERT(dst != NULL); |
| 87 | _DIAGASSERT(src != NULL); |
| 88 | |
| 89 | /* |
| 90 | * Find length of string in dst (maxing out at siz). |
| 91 | */ |
| 92 | size_t dlen = strnlen(dst, siz); |
| 93 | |
| 94 | /* |
| 95 | * Copy src into any remaining space in dst (truncating if needed). |
| 96 | * Note strlcpy(dst, src, 0) returns strlen(src). |
| 97 | */ |
| 98 | return dlen + strlcpy(dst + dlen, src, siz - dlen); |
| 99 | #endif |
| 100 | } |
| 101 | #endif |
| 102 | |