reactos/lib/sdk/crt/string/strxspn.h

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