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sqlite3

    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: }