/****************************************************************************
*
* trandbig.cpp 2007.08.04 Smythies
*              Add the define for _FILE_OFFSET_BITS. For the Linux compile,
*              this will force the use of the LFS (Large File System) library
*              instead of the 2 gigabyte limited default.
*              For the Windows compile, it shouldn't make any difference.
*
* trandbig.cpp 2007.08.03 Smythies
*              Make a large file of random bytes. Then the file should not
*              compress very well at all. Used for checking network and disk
*              rates.
*              See also trandmsr.cpp, trandm2r.cpp, trandt1g.cpp
*
****************************************************************************/

#define _FILE_OFFSET_BITS 64

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

#define GIGS 8
#define WRITE_SIZE 1048576

char pattern[WRITE_SIZE]; /*  */
long i, j, k;

main(){

   int err;
   FILE *out;

   if((out = fopen("big", "wb")) == NULL){
      printf("Cannot open output file\n");
      return(1);
   } /* endif */

   srand(79);
   for(j = 0; j < GIGS; j++){
      printf("\nCompleted 1 gig loops: %4ld\n", j);
      for(i = 0; i < 1024; i++){ /* a gigabyte at a time */
      printf(".");
         for(k = 0; k < WRITE_SIZE; k++){
            pattern[k] = (char)(255&(rand()));
         } /* endfor */
         err = fwrite(&pattern,1,WRITE_SIZE,out);
         if(err != WRITE_SIZE){
            printf("problem writing output. Bytes = %d\n",err);
            fclose(out);
            return(1);
         } /* endif */
      } /* endfor */
   } /* endfor */
   fclose(out);
   return(0);
} /* endprogram */