diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/bitvec.c | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/src/bitvec.c b/src/bitvec.c index 89cf1b30b..3855ebfc2 100644 --- a/src/bitvec.c +++ b/src/bitvec.c @@ -385,6 +385,9 @@ void sqlite3ShowBitvec(Bitvec *p){ ** an error is returned. If they are the same, zero is returned. ** ** If a memory allocation error occurs, return -1. +** +** sz is the size of the Bitvec. Or if sz is negative, make the size +** 2*(unsigned)(-sz) and disabled the linear vector check. */ int sqlite3BitvecBuiltinTest(int sz, int *aOp){ Bitvec *pBitvec = 0; @@ -395,10 +398,15 @@ int sqlite3BitvecBuiltinTest(int sz, int *aOp){ /* Allocate the Bitvec to be tested and a linear array of ** bits to act as the reference */ - pBitvec = sqlite3BitvecCreate( sz ); - pV = sqlite3MallocZero( (7+(i64)sz)/8 + 1 ); + if( sz<=0 ){ + pBitvec = sqlite3BitvecCreate( 2*(unsigned)(-sz) ); + pV = 0; + }else{ + pBitvec = sqlite3BitvecCreate( sz ); + pV = sqlite3MallocZero( (7+(i64)sz)/8 + 1 ); + } pTmpSpace = sqlite3_malloc64(BITVEC_SZ); - if( pBitvec==0 || pV==0 || pTmpSpace==0 ) goto bitvec_end; + if( pBitvec==0 || pTmpSpace==0 ) goto bitvec_end; /* NULL pBitvec tests */ sqlite3BitvecSet(0, 1); @@ -448,12 +456,12 @@ int sqlite3BitvecBuiltinTest(int sz, int *aOp){ pc += nx; i = (i & 0x7fffffff)%sz; if( (op & 1)!=0 ){ - SETBIT(pV, (i+1)); + if( pV ) SETBIT(pV, (i+1)); if( op!=5 ){ if( sqlite3BitvecSet(pBitvec, i+1) ) goto bitvec_end; } }else{ - CLEARBIT(pV, (i+1)); + if( pV ) CLEARBIT(pV, (i+1)); sqlite3BitvecClear(pBitvec, i+1, pTmpSpace); } } @@ -463,14 +471,18 @@ int sqlite3BitvecBuiltinTest(int sz, int *aOp){ ** match (rc==0). Change rc to non-zero if a discrepancy ** is found. */ - rc = sqlite3BitvecTest(0,0) + sqlite3BitvecTest(pBitvec, sz+1) - + sqlite3BitvecTest(pBitvec, 0) - + (sqlite3BitvecSize(pBitvec) - sz); - for(i=1; i<=sz; i++){ - if( (TESTBIT(pV,i))!=sqlite3BitvecTest(pBitvec,i) ){ - rc = i; - break; + if( pV ){ + rc = sqlite3BitvecTest(0,0) + sqlite3BitvecTest(pBitvec, sz+1) + + sqlite3BitvecTest(pBitvec, 0) + + (sqlite3BitvecSize(pBitvec) - sz); + for(i=1; i<=sz; i++){ + if( (TESTBIT(pV,i))!=sqlite3BitvecTest(pBitvec,i) ){ + rc = i; + break; + } } + }else{ + rc = 0; } /* Free allocated structure */ |