/*** A utility for printing the differences between two SQLite database files.*/#include <stdio.h>#include <ctype.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <stdlib.h>#define PAGESIZE 1024static int db1 = -1;static int db2 = -1;int main(int argc, char **argv){  int iPg;  unsigned char a1[PAGESIZE], a2[PAGESIZE];  if( argc!=3 ){    fprintf(stderr,"Usage: %s FILENAME FILENAME\n", argv[0]);    exit(1);  }  db1 = open(argv[1], O_RDONLY);  if( db1<0 ){    fprintf(stderr,"%s: can't open %s\n", argv[0], argv[1]);    exit(1);  }  db2 = open(argv[2], O_RDONLY);  if( db2<0 ){    fprintf(stderr,"%s: can't open %s\n", argv[0], argv[2]);    exit(1);  }  iPg = 1;  while( read(db1, a1, PAGESIZE)==PAGESIZE && read(db2,a2,PAGESIZE)==PAGESIZE ){    if( memcmp(a1,a2,PAGESIZE) ){      printf("Page %d\n", iPg);    }    iPg++;  }  printf("%d pages checked\n", iPg-1);  close(db1);  close(db2);}