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/*

FUNCTION

	<>---find initial match

INDEX

	strspn

ANSI_SYNOPSIS

	#include 

	size_t strspn(const char *<[s1]>, const char *<[s2]>);

TRAD_SYNOPSIS

	#include 

	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

	<> returns the length of the segment found.

PORTABILITY

<> is ANSI C.

<> requires no supporting OS subroutines.

QUICKREF

	strspn ansi pure

*/

#include 

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;

}