libio/dbz/byteflip.c

   1 #include <stdio.h>
   2
   3 #define MAXWORD 32
   4
   5 int
   6 main(argc, argv)
   7 int argc;
   8 char *argv[];
   9 {
  10         register int len;
  11         int inmap[MAXWORD];
  12         int outmap[MAXWORD];
  13         char in[MAXWORD];
  14         char out[MAXWORD];
  15         register int i;
  16         register int a;
  17
  18         a = 1;
  19         len = atoi(argv[a++]);
  20         if (len > MAXWORD)
  21                 abort();        /* kind of drastic... */
  22         for (i = 0; i < len; i++)
  23                 inmap[i] = atoi(argv[a++]);
  24         if (atoi(argv[a++]) != len)
  25                 abort();
  26         for (i = 0; i < len; i++)
  27                 outmap[i] = atoi(argv[a++]);
  28
  29         while (fread(in, 1, len, stdin) == len) {
  30                 for (i = 0; i < len; i++)
  31                         out[outmap[i]] = in[inmap[i]];
  32                 fwrite(out, 1, len, stdout);
  33         }
  34 #ifdef DBZ_FINISH
  35         DBZ_FINISH;
  36 #endif
  37         exit(0);
  38 }