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Add support for the sqlite_unsupported_offset() SQL function if and only

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if compiled using -DSQLITE_ENABLE_OFFSET_SQL_FUNC.  Use that definition
when compiling the command-line shell.

FossilOrigin-Name: 4f1f1f521ae6da96b899e10bfeff6bc1ab7a45de0705076febaae20b441f48c6
This commit is contained in:
drh
2017-12-29 17:21:21 +00:00
parent ee052a1c94 9af41ff452
commit c64487b9c8
14 changed files with 187 additions and 21 deletions
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30
src/vdbe.c
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@@ -2349,6 +2349,36 @@ case OP_IfNullRow: { /* jump */
break;
}
#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
/* Opcode: Offset P1 P2 P3 * *
** Synopsis: r[P3] = sqlite_offset(P1)
**
** Store in register r[P3] the byte offset into the database file that is the
** start of the payload for the record at which that cursor P1 is currently
** pointing.
**
** P2 is the column number for the argument to the sqlite_offset() function.
** This opcode does not use P2 itself, but the P2 value is used by the
** code generator. The P1, P2, and P3 operands to this opcode are the
** as as for OP_Column.
**
** This opcode is only available if SQLite is compiled with the
** -DSQLITE_ENABLE_OFFSET_SQL_FUNC option.
*/
case OP_Offset: { /* out3 */
VdbeCursor *pC; /* The VDBE cursor */
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
pC = p->apCsr[pOp->p1];
pOut = &p->aMem[pOp->p3];
if( NEVER(pC==0) || pC->eCurType!=CURTYPE_BTREE ){
sqlite3VdbeMemSetNull(pOut);
}else{
sqlite3VdbeMemSetInt64(pOut, sqlite3BtreeOffset(pC->uc.pCursor));
}
break;
}
#endif /* SQLITE_ENABLE_OFFSET_SQL_FUNC */
/* Opcode: Column P1 P2 P3 P4 P5
** Synopsis: r[P3]=PX
**