reactos/lib/string/strxspn.h

   1 /* $Id$
   2  */
   3
   4 #include <limits.h>
   5 #include <string.h>
   6
   7 size_t _strxspn(const char *s1, const char *s2)
   8 {
   9  unsigned char char_map[1 << CHAR_BIT * sizeof(char)];
  10  const unsigned char * us2 = (const unsigned char *)s2;
  11  const unsigned char * str = (const unsigned char *)s1;
  12
  13  memset(char_map, 0, sizeof(char_map));
  14
  15  for(; *us2; ++ us2)
  16   char_map[*us2 / CHAR_BIT] |= (1 << (*us2 % CHAR_BIT));
  17
  18  for(; *str; ++ str)
  19   if(_x(char_map[*str / CHAR_BIT] & (1 << (*str % CHAR_BIT)))) break;
  20
  21  return (size_t)str - (size_t)s1;
  22 }
  23
  24 /* EOF */