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Synopsis
size_t strcspn(const char *s1, const char *s2);
Description
This function computes the length of the initial part of
the string pointed to by s1 which consists entirely of
characters NOT from the string pointed to by s2
(excluding the terminating null character).
Returns
strcspn returns the length of the substring found.
Portability
strcspn is ANSI C.
strcspn requires no supporting OS subroutines.
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