spewG.c revision 78556 
1
2/* spew out a thoroughly gigantic file designed so that bzip2
3   can compress it reasonably rapidly.  This is to help test
4   support for large files (> 2GB) in a reasonable amount of time.
5   I suggest you use the undocumented --exponential option to
6   bzip2 when compressing the resulting file; this saves a bit of
7   time.  Note: *don't* bother with --exponential when compressing
8   Real Files; it'll just waste a lot of CPU time :-)
9   (but is otherwise harmless).
10*/
11
12#define _FILE_OFFSET_BITS 64
13
14#include <stdio.h>
15#include <stdlib.h>
16
17/* The number of megabytes of junk to spew out (roughly) */
18#define MEGABYTES 5000
19
20#define N_BUF 1000000
21char buf[N_BUF];
22
23int main ( int argc, char** argv )
24{
25   int ii, kk, p;
26   srandom(1);
27   setbuffer ( stdout, buf, N_BUF );
28   for (kk = 0; kk < MEGABYTES * 515; kk+=3) {
29      p = 25+random()%50;
30      for (ii = 0; ii < p; ii++)
31         printf ( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" );
32      for (ii = 0; ii < p-1; ii++)
33         printf ( "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" );
34      for (ii = 0; ii < p+1; ii++)
35         printf ( "ccccccccccccccccccccccccccccccccccccc" );
36   }
37   fflush(stdout);
38   return 0;
39}
40