source: trunk/libs/newlib/src/newlib/libc/string/strcspn.c @ 471

/*
FUNCTION
        <<strcspn>>---count characters not in string

INDEX
        strcspn

SYNOPSIS
        size_t strcspn(const char *<[s1]>, const 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
strcspn (const char *s1,
        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;
}