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/*
FUNCTION
<<strspn>>---find initial match
INDEX
strspn
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.
QUICKREF
strspn ansi pure
*/
#include <string.h>
size_t
_DEFUN (strspn, (s1, s2),
_CONST char *s1 _AND
_CONST char *s2)
{
_CONST char *s = s1;
_CONST char *c;
while (*s1)
{
for (c = s2; *c; c++)
{
if (*s1 == *c)
break;
}
if (*c == '\0')
break;
s1++;
}
return s1 - s;
}
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