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/*-------------------------------------------------------------------------
*
* nbtcompare.c
* Comparison functions for btree access method.
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtcompare.c,v 1.31 2000/01/26 05:55:58 momjian Exp $
*
* NOTES
* These functions are stored in pg_amproc. For each operator class
* defined on btrees, they compute
*
* compare(a, b):
* < 0 if a < b,
* = 0 if a == b,
* > 0 if a > b.
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "utils/builtins.h"
int32
btint2cmp(int16 a, int16 b)
{
return (int32) (a - b);
}
int32
btint4cmp(int32 a, int32 b)
{
return a - b;
}
int32
btint8cmp(int64 *a, int64 *b)
{
if (*a > *b)
return 1;
else if (*a == *b)
return 0;
else
return -1;
}
int32
btint24cmp(int16 a, int32 b)
{
return ((int32) a) - b;
}
int32
btint42cmp(int32 a, int16 b)
{
return a - ((int32) b);
}
int32
btfloat4cmp(float32 a, float32 b)
{
if (*a > *b)
return 1;
else if (*a == *b)
return 0;
else
return -1;
}
int32
btfloat8cmp(float64 a, float64 b)
{
if (*a > *b)
return 1;
else if (*a == *b)
return 0;
else
return -1;
}
int32
btoidcmp(Oid a, Oid b)
{
if (a > b)
return 1;
else if (a == b)
return 0;
else
return -1;
}
int32
btoidvectorcmp(Oid *a, Oid *b)
{
int i;
for (i = 0; i < INDEX_MAX_KEYS; i++)
/* we use this because we need the int4gt, etc */
if (!int4eq(a[i], b[i]))
{
if (int4gt(a[i], b[i]))
return 1;
else
return -1;
}
return 0;
}
int32
btabstimecmp(AbsoluteTime a, AbsoluteTime b)
{
if (AbsoluteTimeIsBefore(a, b))
return -1;
else if (AbsoluteTimeIsBefore(b, a))
return 1;
else
return 0;
}
int32
btcharcmp(char a, char b)
{
return (int32) ((uint8) a - (uint8) b);
}
int32
btnamecmp(NameData *a, NameData *b)
{
return strncmp(NameStr(*a), NameStr(*b), NAMEDATALEN);
}
int32
bttextcmp(struct varlena * a, struct varlena * b)
{
int res;
unsigned char *ap,
*bp;
#ifdef USE_LOCALE
int la = VARSIZE(a) - VARHDRSZ;
int lb = VARSIZE(b) - VARHDRSZ;
ap = (unsigned char *) palloc(la + 1);
bp = (unsigned char *) palloc(lb + 1);
memcpy(ap, VARDATA(a), la);
*(ap + la) = '\0';
memcpy(bp, VARDATA(b), lb);
*(bp + lb) = '\0';
res = strcoll(ap, bp);
pfree(ap);
pfree(bp);
#else
int len = VARSIZE(a);
/* len is the length of the shorter of the two strings */
if (len > VARSIZE(b))
len = VARSIZE(b);
len -= VARHDRSZ;
ap = (unsigned char *) VARDATA(a);
bp = (unsigned char *) VARDATA(b);
/*
* If the two strings differ in the first len bytes, or if they're the
* same in the first len bytes and they're both len bytes long, we're
* done.
*/
res = 0;
if (len > 0)
{
do
{
res = (int) (*ap++ - *bp++);
len--;
} while (res == 0 && len != 0);
}
#endif
if (res != 0 || VARSIZE(a) == VARSIZE(b))
return res;
/*
* The two strings are the same in the first len bytes, and they are
* of different lengths.
*/
if (VARSIZE(a) < VARSIZE(b))
return -1;
else
return 1;
}
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