47 lines
773 B
C
47 lines
773 B
C
/*
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FUNCTION
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<<strcspn>>---count characters not in string
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INDEX
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strcspn
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SYNOPSIS
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size_t strcspn(const char *<[s1]>, const char *<[s2]>);
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DESCRIPTION
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This function computes the length of the initial part of
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the string pointed to by <[s1]> which consists entirely of
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characters <[NOT]> from the string pointed to by <[s2]>
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(excluding the terminating null character).
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RETURNS
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<<strcspn>> returns the length of the substring found.
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PORTABILITY
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<<strcspn>> is ANSI C.
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<<strcspn>> requires no supporting OS subroutines.
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*/
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#include <string.h>
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size_t
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strcspn (const char *s1,
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const char *s2)
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{
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const char *s = s1;
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const char *c;
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while (*s1)
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{
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for (c = s2; *c; c++)
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{
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if (*s1 == *c)
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goto end;
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}
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s1++;
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}
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end:
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return s1 - s;
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}
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