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 | |