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/*

FUNCTION

        <<strcspn>>---count characters not in string

INDEX

        strcspn

ANSI_SYNOPSIS

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

TRAD_SYNOPSIS

        size_t strcspn(<[s1]>, <[s2]>)

        char *<[s1]>;

        char *<[s2]>;

DESCRIPTION

        This function computes the length of the initial part of

        the string pointed to by <[s1]> which consists entirely of

        characters <[NOT]> from the string pointed to by <[s2]>

        (excluding the terminating null character).

RETURNS

        <<strcspn>> returns the length of the substring found.

PORTABILITY

<<strcspn>> is ANSI C.

<<strcspn>> requires no supporting OS subroutines.

 */

#include <string.h>

size_t

_DEFUN (strcspn, (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)

        break;

      s1++;

    }

  return s1 - s;

}