source: trunk/libs/newlib/src/newlib/libc/string/strspn.c @ 444

/*
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
strspn (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 == '\0')
        break;
      s1++;
    }

  return s1 - s;
}