/*

* Simple file compare program, it finds the number of rounding errors

* and dies if there is too large an error ( ABS(a-b)>1 ).

*

* copyright (c) 2001 Michael Niedermayer

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation; either version 2 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License along

* with this program; if not, write to the Free Software Foundation, Inc.,

* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*/

#include <stdio.h>

#include <stdlib.h>

// FIXME: No checks but it is just for debugging so who cares ;)

int main(int argc, char **argv)

{

FILE *f0, *f1;

int dif=0;

if(argc!=3)

{

printf("compare <file1> <file2>\n");

exit(2);

}

f0= fopen(argv[1], "rb");

f1= fopen(argv[2], "rb");

for(;;)

{

short c0;

short c1;

int d;

int e0= fread(&c0, 2, 1, f0);

int e1= fread(&c1, 2, 1, f1);

d=c0-c1;

if(e0==0 && e1==0) break;

if(e0==0 || e1==0)

{

printf("FATAL error, files have different size!\n");

exit(1);

}

if(d<0) d=-d; // ABS

if(d>1)

{

printf("FATAL error, too large a difference found (%d)!\n", d);

exit(1);

}

if(d) dif++;

}

fclose(f0);

fclose(f1);

printf("%d (+/-1)differences found\n", dif);

exit(0);

}