#include <stdio.h>
#include <stdlib.h>

void tab_to_space(FILE *ifp, FILE *ofp) {
  int c;
  int space = 0,
  count = 0;
  rewind(ifp);
  while((c = getc(ifp)) != EOF) {
    if(c == '\t') {
      space = (8-(count%8));
      while(space != 0) {
        putc(' ', ofp);
        space--;
        count++;
      }
    } else {
      putc(c, ofp);
      ++count;
    }
    if(c == '\n')
     count = 0;

  }
}

int main(int argc, char *argv[]) {
  FILE *ifp,
  *ofp;
  if(argc != 3) {
    printf("Need ifp,ofp files");
    exit(1);
  }
  ifp = fopen(argv[1], "r");
  ofp = fopen(argv[2], "w");
  tab_to_space(ifp, ofp);
  fclose(ifp);
  fclose(ofp);
  return 0;
}