/*  April 2011, Laura Toma

    Create test files for iosort

*/

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

int main(int argc, char** argv) {

  if (argc !=3) {
    printf("usage: %s filename size\n", argv[0]);
    return 1; 
  }

  char* fname = argv[1];
  long n = atol(argv[2]); 
  printf("Creating file %s size %lu..\n", fname, n);

  FILE* f; 
  f = fopen(fname, "wb");
  if (!f)  {
    perror("could not open file");
    return 1; 
  }

  long i, k; 
  for (i=0; i< n; i++) {
    k = n-i; 
    if (fwrite(&k, sizeof(long),1, f) < 1) {
      perror("could not write to file");
    }
  }
 
  printf("Done. File size %lu B.\n", ftell(f));  
  fclose(f); 

  //read_file(fname, n);
  return 0; 
}


void read_file(char* fname, long n) {

  FILE* f;
  f = fopen(fname, "rb");
  if (!f)  {
    perror("could not open file");
    return; 
  }
  long i,k; 
  for (i=0; i< n; i++) {
    if (fread(&k, sizeof(long),1, f) < 1) {
      perror("could not write to file");
    }
    printf("%lu ", k);
  }
  fclose(f);
  return;
}