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Synopsis
#include <string.h>
size_t strspn(const char *s1, const char *s2);
Description
This function computes the length of the initial segment of
the string pointed to by s1 which consists entirely of
characters from the string pointed to by s2 (excluding the
terminating null character).
Returns
strspn returns the length of the segment found.
Portability
strspn is ANSI C.
strspn requires no supporting OS subroutines.
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