| 1 | /* $NetBSD: strcspn.c,v 1.1 2014/07/19 18:38:33 lneto Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 Joerg Sonnenberger |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR |
| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 19 | * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <sys/cdefs.h> |
| 29 | __RCSID("$NetBSD: strcspn.c,v 1.1 2014/07/19 18:38:33 lneto Exp $" ); |
| 30 | |
| 31 | #if !defined(_KERNEL) && !defined(_STANDALONE) |
| 32 | #include <assert.h> |
| 33 | #include <inttypes.h> |
| 34 | #include <limits.h> |
| 35 | #include <string.h> |
| 36 | #else |
| 37 | #include <lib/libkern/libkern.h> |
| 38 | #endif |
| 39 | |
| 40 | /* 64bit version is in strspn.c */ |
| 41 | #if ULONG_MAX != 0xffffffffffffffffull |
| 42 | |
| 43 | size_t |
| 44 | strcspn(const char *s, const char *charset) |
| 45 | { |
| 46 | static const uint8_t idx[8] = { 1, 2, 4, 8, 16, 32, 64, 128 }; |
| 47 | const char *t; |
| 48 | uint8_t set[32]; |
| 49 | #define UC(a) ((unsigned int)(unsigned char)(a)) |
| 50 | |
| 51 | _DIAGASSERT(s != NULL); |
| 52 | _DIAGASSERT(charset != NULL); |
| 53 | |
| 54 | if (charset[0] == '\0') |
| 55 | return strlen(s); |
| 56 | if (charset[1] == '\0') { |
| 57 | for (t = s; *t != '\0'; ++t) |
| 58 | if (*t == *charset) |
| 59 | break; |
| 60 | return t - s; |
| 61 | } |
| 62 | |
| 63 | (void)memset(set, 0, sizeof(set)); |
| 64 | |
| 65 | for (; *charset != '\0'; ++charset) |
| 66 | set[UC(*charset) >> 3] |= idx[UC(*charset) & 7]; |
| 67 | |
| 68 | for (t = s; *t != '\0'; ++t) |
| 69 | if (set[UC(*t) >> 3] & idx[UC(*t) & 7]) |
| 70 | break; |
| 71 | return t - s; |
| 72 | } |
| 73 | |
| 74 | #endif |
| 75 | |