third_party/sqlite/src/tool/diffdb.c

   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
  14 static int db1 = -1;
  15 static int db2 = -1;
  16
  17 int 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 }