mdw@git.distorted.org.uk Git - autoys/blob - flaccrip/flaccrip-compute

   1 #! /usr/bin/tcc -run
   2 /* -*-c-*- */
   3
   4 #include <errno.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8
   9 #include <getopt.h>
  10
  11 int main(int argc, char *argv[])
  12 {
  13   unsigned long ck = 0, t = 0;
  14   unsigned long ns = 0;
  15   unsigned long x;
  16   unsigned f = 0;
  17 #define F_ROLLING 1u
  18
  19   for (;;) {
  20     int opt = getopt(argc, argv, "b:r");
  21     if (opt < 0) break;
  22     switch (opt) {
  23       case 'b': ns = strtoul(optarg, 0, 0); break;
  24       case 'r': f |= F_ROLLING; break;
  25       default: exit(1);
  26     }
  27   }
  28   for (;;) {
  29     unsigned char b[4];
  30     if (!fread(b, 4, 1, stdin)) break;
  31     x = (b[0] <<  0) | (b[1] <<  8) | (b[2] << 16) | (b[3] << 24);
  32     ck += x*++ns; t += x;
  33   }
  34   if (ferror(stdin)) {
  35     fprintf(stderr, "%s: read error: %s\n", argv[0], strerror(errno));
  36     exit(1);
  37   }
  38   printf("%08lx", ck & 0xffffffff);
  39   if (f & F_ROLLING) printf(" %lu", t & 0xffffffff);
  40   putchar('\n');
  41   return (0);
  42 }