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-rw-r--r--contrib/ltree/ltree_op.c11
-rw-r--r--contrib/pgcrypto/imath.c15
-rw-r--r--src/backend/access/nbtree/nbtcompare.c77
-rw-r--r--src/backend/access/nbtree/nbtsearch.c2
-rw-r--r--src/backend/access/nbtree/nbtutils.c4
-rw-r--r--src/backend/executor/nodeIndexscan.c7
-rw-r--r--src/backend/executor/nodeMergeAppend.c5
-rw-r--r--src/bin/pg_rewind/filemap.c2
-rw-r--r--src/include/access/nbtree.h3
-rw-r--r--src/include/c.h8
-rw-r--r--src/include/utils/sortsupport.h7
11 files changed, 86 insertions, 55 deletions
diff --git a/contrib/ltree/ltree_op.c b/contrib/ltree/ltree_op.c
index cb59d21ced4..d1067f81465 100644
--- a/contrib/ltree/ltree_op.c
+++ b/contrib/ltree/ltree_op.c
@@ -45,17 +45,24 @@ ltree_compare(const ltree *a, const ltree *b)
ltree_level *bl = LTREE_FIRST(b);
int an = a->numlevel;
int bn = b->numlevel;
- int res = 0;
while (an > 0 && bn > 0)
{
+ int res;
+
if ((res = memcmp(al->name, bl->name, Min(al->len, bl->len))) == 0)
{
if (al->len != bl->len)
return (al->len - bl->len) * 10 * (an + 1);
}
else
+ {
+ if (res < 0)
+ res = -1;
+ else
+ res = 1;
return res * 10 * (an + 1);
+ }
an--;
bn--;
@@ -146,7 +153,7 @@ inner_isparent(const ltree *c, const ltree *p)
{
if (cl->len != pl->len)
return false;
- if (memcmp(cl->name, pl->name, cl->len))
+ if (memcmp(cl->name, pl->name, cl->len) != 0)
return false;
pn--;
diff --git a/contrib/pgcrypto/imath.c b/contrib/pgcrypto/imath.c
index 61a01e2b710..6449dd34b0b 100644
--- a/contrib/pgcrypto/imath.c
+++ b/contrib/pgcrypto/imath.c
@@ -1254,11 +1254,9 @@ mp_int_compare(mp_int a, mp_int b)
* If they're both zero or positive, the normal comparison applies; if
* both negative, the sense is reversed.
*/
- if (sa == MP_ZPOS)
- return cmp;
- else
- return -cmp;
-
+ if (sa != MP_ZPOS)
+ INVERT_COMPARE_RESULT(cmp);
+ return cmp;
}
else
{
@@ -1314,10 +1312,9 @@ mp_int_compare_value(mp_int z, int value)
{
cmp = s_vcmp(z, value);
- if (vsign == MP_ZPOS)
- return cmp;
- else
- return -cmp;
+ if (vsign != MP_ZPOS)
+ INVERT_COMPARE_RESULT(cmp);
+ return cmp;
}
else
{
diff --git a/src/backend/access/nbtree/nbtcompare.c b/src/backend/access/nbtree/nbtcompare.c
index 8ce800945ac..d915539df79 100644
--- a/src/backend/access/nbtree/nbtcompare.c
+++ b/src/backend/access/nbtree/nbtcompare.c
@@ -22,11 +22,10 @@
*
* The result is always an int32 regardless of the input datatype.
*
- * Although any negative int32 (except INT_MIN) is acceptable for reporting
- * "<", and any positive int32 is acceptable for reporting ">", routines
+ * Although any negative int32 is acceptable for reporting "<",
+ * and any positive int32 is acceptable for reporting ">", routines
* that work on 32-bit or wider datatypes can't just return "a - b".
- * That could overflow and give the wrong answer. Also, one must not
- * return INT_MIN to report "<", since some callers will negate the result.
+ * That could overflow and give the wrong answer.
*
* NOTE: it is critical that the comparison function impose a total order
* on all non-NULL values of the data type, and that the datatype's
@@ -44,13 +43,31 @@
* during an index access won't be recovered till end of query. This
* primarily affects comparison routines for toastable datatypes;
* they have to be careful to free any detoasted copy of an input datum.
+ *
+ * NOTE: we used to forbid comparison functions from returning INT_MIN,
+ * but that proves to be too error-prone because some platforms' versions
+ * of memcmp() etc can return INT_MIN. As a means of stress-testing
+ * callers, this file can be compiled with STRESS_SORT_INT_MIN defined
+ * to cause many of these functions to return INT_MIN or INT_MAX instead of
+ * their customary -1/+1. For production, though, that's not a good idea
+ * since users or third-party code might expect the traditional results.
*-------------------------------------------------------------------------
*/
#include "postgres.h"
+#include <limits.h>
+
#include "utils/builtins.h"
#include "utils/sortsupport.h"
+#ifdef STRESS_SORT_INT_MIN
+#define A_LESS_THAN_B INT_MIN
+#define A_GREATER_THAN_B INT_MAX
+#else
+#define A_LESS_THAN_B (-1)
+#define A_GREATER_THAN_B 1
+#endif
+
Datum
btboolcmp(PG_FUNCTION_ARGS)
@@ -95,11 +112,11 @@ btint4cmp(PG_FUNCTION_ARGS)
int32 b = PG_GETARG_INT32(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
static int
@@ -109,11 +126,11 @@ btint4fastcmp(Datum x, Datum y, SortSupport ssup)
int32 b = DatumGetInt32(y);
if (a > b)
- return 1;
+ return A_GREATER_THAN_B;
else if (a == b)
return 0;
else
- return -1;
+ return A_LESS_THAN_B;
}
Datum
@@ -132,11 +149,11 @@ btint8cmp(PG_FUNCTION_ARGS)
int64 b = PG_GETARG_INT64(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
static int
@@ -146,11 +163,11 @@ btint8fastcmp(Datum x, Datum y, SortSupport ssup)
int64 b = DatumGetInt64(y);
if (a > b)
- return 1;
+ return A_GREATER_THAN_B;
else if (a == b)
return 0;
else
- return -1;
+ return A_LESS_THAN_B;
}
Datum
@@ -169,11 +186,11 @@ btint48cmp(PG_FUNCTION_ARGS)
int64 b = PG_GETARG_INT64(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
Datum
@@ -183,11 +200,11 @@ btint84cmp(PG_FUNCTION_ARGS)
int32 b = PG_GETARG_INT32(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
Datum
@@ -197,11 +214,11 @@ btint24cmp(PG_FUNCTION_ARGS)
int32 b = PG_GETARG_INT32(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
Datum
@@ -211,11 +228,11 @@ btint42cmp(PG_FUNCTION_ARGS)
int16 b = PG_GETARG_INT16(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
Datum
@@ -225,11 +242,11 @@ btint28cmp(PG_FUNCTION_ARGS)
int64 b = PG_GETARG_INT64(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
Datum
@@ -239,11 +256,11 @@ btint82cmp(PG_FUNCTION_ARGS)
int16 b = PG_GETARG_INT16(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
Datum
@@ -253,11 +270,11 @@ btoidcmp(PG_FUNCTION_ARGS)
Oid b = PG_GETARG_OID(1);
if (a > b)
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else if (a == b)
PG_RETURN_INT32(0);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
static int
@@ -267,11 +284,11 @@ btoidfastcmp(Datum x, Datum y, SortSupport ssup)
Oid b = DatumGetObjectId(y);
if (a > b)
- return 1;
+ return A_GREATER_THAN_B;
else if (a == b)
return 0;
else
- return -1;
+ return A_LESS_THAN_B;
}
Datum
@@ -299,9 +316,9 @@ btoidvectorcmp(PG_FUNCTION_ARGS)
if (a->values[i] != b->values[i])
{
if (a->values[i] > b->values[i])
- PG_RETURN_INT32(1);
+ PG_RETURN_INT32(A_GREATER_THAN_B);
else
- PG_RETURN_INT32(-1);
+ PG_RETURN_INT32(A_LESS_THAN_B);
}
}
PG_RETURN_INT32(0);
diff --git a/src/backend/access/nbtree/nbtsearch.c b/src/backend/access/nbtree/nbtsearch.c
index 527efdfb315..108b0e27c08 100644
--- a/src/backend/access/nbtree/nbtsearch.c
+++ b/src/backend/access/nbtree/nbtsearch.c
@@ -484,7 +484,7 @@ _bt_compare(Relation rel,
scankey->sk_argument));
if (!(scankey->sk_flags & SK_BT_DESC))
- result = -result;
+ INVERT_COMPARE_RESULT(result);
}
/* if the keys are unequal, return the difference */
diff --git a/src/backend/access/nbtree/nbtutils.c b/src/backend/access/nbtree/nbtutils.c
index ef889b9e5bc..88d0b12f93f 100644
--- a/src/backend/access/nbtree/nbtutils.c
+++ b/src/backend/access/nbtree/nbtutils.c
@@ -509,7 +509,7 @@ _bt_compare_array_elements(const void *a, const void *b, void *arg)
cxt->collation,
da, db));
if (cxt->reverse)
- compare = -compare;
+ INVERT_COMPARE_RESULT(compare);
return compare;
}
@@ -1638,7 +1638,7 @@ _bt_check_rowcompare(ScanKey skey, IndexTuple tuple, TupleDesc tupdesc,
subkey->sk_argument));
if (subkey->sk_flags & SK_BT_DESC)
- cmpresult = -cmpresult;
+ INVERT_COMPARE_RESULT(cmpresult);
/* Done comparing if unequal, else advance to next column */
if (cmpresult != 0)
diff --git a/src/backend/executor/nodeIndexscan.c b/src/backend/executor/nodeIndexscan.c
index 11de6f11298..0dfbfbd5eb7 100644
--- a/src/backend/executor/nodeIndexscan.c
+++ b/src/backend/executor/nodeIndexscan.c
@@ -412,9 +412,10 @@ reorderqueue_cmp(const pairingheap_node *a, const pairingheap_node *b,
ReorderTuple *rtb = (ReorderTuple *) b;
IndexScanState *node = (IndexScanState *) arg;
- return -cmp_orderbyvals(rta->orderbyvals, rta->orderbynulls,
- rtb->orderbyvals, rtb->orderbynulls,
- node);
+ /* exchange argument order to invert the sort order */
+ return cmp_orderbyvals(rtb->orderbyvals, rtb->orderbynulls,
+ rta->orderbyvals, rta->orderbynulls,
+ node);
}
/*
diff --git a/src/backend/executor/nodeMergeAppend.c b/src/backend/executor/nodeMergeAppend.c
index bdf76808a8a..100dbbbf53b 100644
--- a/src/backend/executor/nodeMergeAppend.c
+++ b/src/backend/executor/nodeMergeAppend.c
@@ -250,7 +250,10 @@ heap_compare_slots(Datum a, Datum b, void *arg)
datum2, isNull2,
sortKey);
if (compare != 0)
- return -compare;
+ {
+ INVERT_COMPARE_RESULT(compare);
+ return compare;
+ }
}
return 0;
}
diff --git a/src/bin/pg_rewind/filemap.c b/src/bin/pg_rewind/filemap.c
index 60c85a4b662..366b97de91f 100644
--- a/src/bin/pg_rewind/filemap.c
+++ b/src/bin/pg_rewind/filemap.c
@@ -680,7 +680,7 @@ final_filemap_cmp(const void *a, const void *b)
return -1;
if (fa->action == FILE_ACTION_REMOVE)
- return -strcmp(fa->path, fb->path);
+ return strcmp(fb->path, fa->path);
else
return strcmp(fa->path, fb->path);
}
diff --git a/src/include/access/nbtree.h b/src/include/access/nbtree.h
index 42928d49f9b..d8c14e0493a 100644
--- a/src/include/access/nbtree.h
+++ b/src/include/access/nbtree.h
@@ -444,8 +444,7 @@ typedef struct xl_btree_newroot
* When a new operator class is declared, we require that the user
* supply us with an amproc procedure (BTORDER_PROC) for determining
* whether, for two keys a and b, a < b, a = b, or a > b. This routine
- * must return < 0, 0, > 0, respectively, in these three cases. (It must
- * not return INT_MIN, since we may negate the result before using it.)
+ * must return < 0, 0, > 0, respectively, in these three cases.
*
* To facilitate accelerated sorting, an operator class may choose to
* offer a second procedure (BTSORTSUPPORT_PROC). For full details, see
diff --git a/src/include/c.h b/src/include/c.h
index 2481ded8385..86e4b549754 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -961,6 +961,14 @@ typedef NameData *Name;
*/
/*
+ * Invert the sign of a qsort-style comparison result, ie, exchange negative
+ * and positive integer values, being careful not to get the wrong answer
+ * for INT_MIN. The argument should be an integral variable.
+ */
+#define INVERT_COMPARE_RESULT(var) \
+ ((var) = ((var) < 0) ? 1 : -(var))
+
+/*
* Use this, not "char buf[BLCKSZ]", to declare a field or local variable
* holding a page buffer, if that page might be accessed as a page and not
* just a string of bytes. Otherwise the variable might be under-aligned,
diff --git a/src/include/utils/sortsupport.h b/src/include/utils/sortsupport.h
index a984edda58f..23f77ca3f99 100644
--- a/src/include/utils/sortsupport.h
+++ b/src/include/utils/sortsupport.h
@@ -96,8 +96,7 @@ typedef struct SortSupportData
* Comparator function has the same API as the traditional btree
* comparison function, ie, return <0, 0, or >0 according as x is less
* than, equal to, or greater than y. Note that x and y are guaranteed
- * not null, and there is no way to return null either. Do not return
- * INT_MIN, as callers are allowed to negate the result before using it.
+ * not null, and there is no way to return null either.
*
* This may be either the authoritative comparator, or the abbreviated
* comparator. Core code may switch this over the initial preference of
@@ -237,7 +236,7 @@ ApplySortComparator(Datum datum1, bool isNull1,
{
compare = (*ssup->comparator) (datum1, datum2, ssup);
if (ssup->ssup_reverse)
- compare = -compare;
+ INVERT_COMPARE_RESULT(compare);
}
return compare;
@@ -275,7 +274,7 @@ ApplySortAbbrevFullComparator(Datum datum1, bool isNull1,
{
compare = (*ssup->abbrev_full_comparator) (datum1, datum2, ssup);
if (ssup->ssup_reverse)
- compare = -compare;
+ INVERT_COMPARE_RESULT(compare);
}
return compare;
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-03 12:33:56 +0000