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1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
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3 | * All rights reserved. |
4 | * | |
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5 | * This code is derived from software contributed to Berkeley by |
6 | * Chris Torek. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
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9 | */ |
10 | ||
2ce81398 | 11 | #if defined(LIBC_SCCS) && !defined(lint) |
a64329b4 | 12 | static char sccsid[] = "@(#)strcspn.c 5.6 (Berkeley) %G%"; |
317e5946 | 13 | #endif /* LIBC_SCCS and not lint */ |
36b10697 | 14 | |
a64329b4 | 15 | #include <sys/cdefs.h> |
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16 | #include <string.h> |
17 | ||
18 | /* | |
19 | * Span the complement of string s2. | |
20 | */ | |
21 | size_t | |
22 | strcspn(s1, s2) | |
23 | const char *s1; | |
24 | register const char *s2; | |
36b10697 | 25 | { |
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26 | register const char *p, *spanp; |
27 | register char c, sc; | |
36b10697 | 28 | |
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29 | /* |
30 | * Stop as soon as we find any character from s2. Note that there | |
31 | * must be a NUL in s2; it suffices to stop when we find that, too. | |
32 | */ | |
33 | for (p = s1;;) { | |
34 | c = *p++; | |
35 | spanp = s2; | |
36 | do { | |
37 | if ((sc = *spanp++) == c) | |
38 | return (p - 1 - s1); | |
39 | } while (sc != 0); | |
36b10697 | 40 | } |
5b6c2309 | 41 | /* NOTREACHED */ |
36b10697 | 42 | } |