1/*
2** A utility for printing the differences between two SQLite database files.
3*/
4#include <stdio.h>
5#include <ctype.h>
6#include <sys/types.h>
7#include <sys/stat.h>
8#include <fcntl.h>
9#include <unistd.h>
10#include <stdlib.h>
11
12
13#define PAGESIZE 1024
14static int db1 = -1;
15static int db2 = -1;
16
17int main(int argc, char **argv){
18  int iPg;
19  unsigned char a1[PAGESIZE], a2[PAGESIZE];
20  if( argc!=3 ){
21    fprintf(stderr,"Usage: %s FILENAME FILENAME\n", argv[0]);
22    exit(1);
23  }
24  db1 = open(argv[1], O_RDONLY);
25  if( db1<0 ){
26    fprintf(stderr,"%s: can't open %s\n", argv[0], argv[1]);
27    exit(1);
28  }
29  db2 = open(argv[2], O_RDONLY);
30  if( db2<0 ){
31    fprintf(stderr,"%s: can't open %s\n", argv[0], argv[2]);
32    exit(1);
33  }
34  iPg = 1;
35  while( read(db1, a1, PAGESIZE)==PAGESIZE && read(db2,a2,PAGESIZE)==PAGESIZE ){
36    if( memcmp(a1,a2,PAGESIZE) ){
37      printf("Page %d\n", iPg);
38    }
39    iPg++;
40  }
41  printf("%d pages checked\n", iPg-1);
42  close(db1);
43  close(db2);
44}
45