340     int nSrcPage = -1;                 /* Size of source db in pages */  in sqlite3_backup_step()  local
391     nSrcPage = (int)sqlite3BtreeLastPage(p->pSrc);  in sqlite3_backup_step()
392     assert( nSrcPage>=0 );  in sqlite3_backup_step()
393     for(ii=0; (nPage<0 || ii<nPage) && p->iNext<=(Pgno)nSrcPage && !rc; ii++){  in sqlite3_backup_step()
406       p->nPagecount = nSrcPage;  in sqlite3_backup_step()
407       p->nRemaining = nSrcPage+1-p->iNext;  in sqlite3_backup_step()
408       if( p->iNext>(Pgno)nSrcPage ){  in sqlite3_backup_step()
421       if( nSrcPage==0 ){  in sqlite3_backup_step()
423         nSrcPage = 1;  in sqlite3_backup_step()
454           nDestTruncate = (nSrcPage+ratio-1)/ratio;  in sqlite3_backup_step()
459           nDestTruncate = nSrcPage * (pgszSrc/pgszDest);  in sqlite3_backup_step()
473           const i64 iSize = (i64)pgszSrc * (i64)nSrcPage;  in sqlite3_backup_step()