1 /* $NetBSD: strcspn.c,v 1.2 2018/02/04 01:13:45 mrg 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 1.2 2018/02/04 01:13:45 mrg 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
strcspn(const char * s,const char * charset)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 if (charset[0] == '\0')
52 return strlen(s);
53 if (charset[1] == '\0') {
54 for (t = s; *t != '\0'; ++t)
55 if (*t == *charset)
56 break;
57 return t - s;
58 }
59
60 (void)memset(set, 0, sizeof(set));
61
62 for (; *charset != '\0'; ++charset)
63 set[UC(*charset) >> 3] |= idx[UC(*charset) & 7];
64
65 for (t = s; *t != '\0'; ++t)
66 if (set[UC(*t) >> 3] & idx[UC(*t) & 7])
67 break;
68 return t - s;
69 }
70
71 #endif
72