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.TH strspn 3
.SH NAME
strspn - get length of substring
.SH SYNOPSIS
#include <string.h>

size_t strspn(const char *s1, const char *s2)
.SH DESCRIPTION
The
.BR strspn ()
function computes the length
of the maximum initial segment
of string pointed to by
.I s1
which consists entirely of characters
from the string pointed to by
.IR s2 .
.SH RETURN VALUE
The
.BR strcspn ()
function shall return the length of the segment.
.SH STANDARDS
ISO/IEC 9899:1999 Section 7.21.5.6