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/*
FUNCTION
	<<strspn>>---find initial match
 
INDEX
	strspn
 
ANSI_SYNOPSIS
	#include <string.h>
	size_t strspn(const char *<[s1]>, const char *<[s2]>);
 
TRAD_SYNOPSIS
	#include <string.h>
	size_t strspn(<[s1]>, <[s2]>)
	char *<[s1]>;
	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;
}