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Fix 3-parameter form of bit substring() to throw error for negative length, 

as required by SQL standard.
This commit is contained in:
Tom Lane 2010-01-07 20:17:44 +00:00
parent e4a6ebf7de
commit 50626efe0a
4 changed files with 33 additions and 12 deletions
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34
src/backend/utils/adt/varbit.c
View File

@ -9,7 +9,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/varbit.c,v 1.62 2010/01/07 19:53:11 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/varbit.c,v 1.63 2010/01/07 20:17:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -23,6 +23,9 @@
#define HEXDIG(z) ((z)<10 ? ((z)+'0') : ((z)-10+'A'))
static VarBit *bitsubstring(VarBit *arg, int32 s, int32 l,
bool length_not_specified);
/* common code for bittypmodin and varbittypmodin */
static int32
@ -927,9 +930,23 @@ bitcat(PG_FUNCTION_ARGS)
Datum
bitsubstr(PG_FUNCTION_ARGS)
{
VarBit *arg = PG_GETARG_VARBIT_P(0);
int32 s = PG_GETARG_INT32(1);
int32 l = PG_GETARG_INT32(2);
PG_RETURN_VARBIT_P(bitsubstring(PG_GETARG_VARBIT_P(0),
PG_GETARG_INT32(1),
PG_GETARG_INT32(2),
false));
}
Datum
bitsubstr_no_len(PG_FUNCTION_ARGS)
{
PG_RETURN_VARBIT_P(bitsubstring(PG_GETARG_VARBIT_P(0),
PG_GETARG_INT32(1),
-1, true));
}
static VarBit *
bitsubstring(VarBit *arg, int32 s, int32 l, bool length_not_specified)
{
VarBit *result;
int bitlen,
rbitlen,
@ -947,14 +964,17 @@ bitsubstr(PG_FUNCTION_ARGS)
bitlen = VARBITLEN(arg);
s1 = Max(s, 1);
/* If we do not have an upper bound, use end of string */
if (l < 0)
if (length_not_specified)
{
e1 = bitlen + 1;
}
else
{
e = s + l;
/* guard against overflow, even though we don't allow L<0 here */
/*
* A negative value for L is the only way for the end position
* to be before the start. SQL99 says to throw an error.
*/
if (e < s)
ereport(ERROR,
(errcode(ERRCODE_SUBSTRING_ERROR),
@ -1011,7 +1031,7 @@ bitsubstr(PG_FUNCTION_ARGS)
}
}
PG_RETURN_VARBIT_P(result);
return result;
}
/* bitlength, bitoctetlength

4
src/include/catalog/catversion.h
View File

@ -37,7 +37,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.569 2010/01/06 05:18:18 momjian Exp $
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.570 2010/01/07 20:17:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201001061
#define CATALOG_VERSION_NO 201001071
#endif

4
src/include/catalog/pg_proc.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.559 2010/01/05 01:06:56 tgl Exp $
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.560 2010/01/07 20:17:44 tgl Exp $
*
* NOTES
* The script catalog/genbki.pl reads this file and generates .bki
@ -2400,7 +2400,7 @@ DESCR("adjust varbit() to typmod length");
DATA(insert OID = 1698 ( position PGNSP PGUID 12 1 0 0 f f f t f i 2 0 23 "1560 1560" _null_ _null_ _null_ _null_ bitposition _null_ _null_ _null_ ));
DESCR("return position of sub-bitstring");
DATA(insert OID = 1699 ( substring PGNSP PGUID 14 1 0 0 f f f t f i 2 0 1560 "1560 23" _null_ _null_ _null_ _null_ "select pg_catalog.substring($1, $2, -1)" _null_ _null_ _null_ ));
DATA(insert OID = 1699 ( substring PGNSP PGUID 12 1 0 0 f f f t f i 2 0 1560 "1560 23" _null_ _null_ _null_ _null_ bitsubstr_no_len _null_ _null_ _null_ ));
DESCR("return portion of bitstring");

3
src/include/utils/varbit.h
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/varbit.h,v 1.29 2010/01/02 16:58:10 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/varbit.h,v 1.30 2010/01/07 20:17:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -88,6 +88,7 @@ extern Datum bitshiftleft(PG_FUNCTION_ARGS);
extern Datum bitshiftright(PG_FUNCTION_ARGS);
extern Datum bitcat(PG_FUNCTION_ARGS);
extern Datum bitsubstr(PG_FUNCTION_ARGS);
extern Datum bitsubstr_no_len(PG_FUNCTION_ARGS);
extern Datum bitlength(PG_FUNCTION_ARGS);
extern Datum bitoctetlength(PG_FUNCTION_ARGS);
extern Datum bitfromint4(PG_FUNCTION_ARGS);