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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. #include <string.h>
  3.  
  4. size_t
  5. strcspn(const char *s1, const char *s2)
  6. {
  7.   const char *p, *spanp;
  8.   char c, sc;
  9.  
  10.   for (p = s1;;)
  11.   {
  12.     c = *p++;
  13.     spanp = s2;
  14.     do {
  15.       if ((sc = *spanp++) == c)
  16.         return p - 1 - s1;
  17.     } while (sc != 0);
  18.   }
  19.   /* NOTREACHED */
  20. }
  21.