mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-09-03 20:17:20 +02:00
f27976c85b
some time ago and recent patch from Gavin Sherry. Update documentation to point out that trailing spaces are insignificant in char(n).
715 lines
16 KiB
C
715 lines
16 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* varchar.c
|
|
* Functions for the built-in types char(n) and varchar(n).
|
|
*
|
|
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* $PostgreSQL: pgsql/src/backend/utils/adt/varchar.c,v 1.104 2004/02/01 06:27:48 tgl Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include "access/hash.h"
|
|
#include "catalog/pg_type.h"
|
|
#include "miscadmin.h"
|
|
#include "utils/array.h"
|
|
#include "utils/builtins.h"
|
|
#include "utils/fmgroids.h"
|
|
|
|
#include "mb/pg_wchar.h"
|
|
|
|
|
|
/*
|
|
* CHAR() and VARCHAR() types are part of the ANSI SQL standard. CHAR()
|
|
* is for blank-padded string whose length is specified in CREATE TABLE.
|
|
* VARCHAR is for storing string whose length is at most the length specified
|
|
* at CREATE TABLE time.
|
|
*
|
|
* It's hard to implement these types because we cannot figure out
|
|
* the length of the type from the type itself. I changed (hopefully all) the
|
|
* fmgr calls that invoke input functions of a data type to supply the
|
|
* length also. (eg. in INSERTs, we have the tupleDescriptor which contains
|
|
* the length of the attributes and hence the exact length of the char() or
|
|
* varchar(). We pass this to bpcharin() or varcharin().) In the case where
|
|
* we cannot determine the length, we pass in -1 instead and the input string
|
|
* must be null-terminated.
|
|
*
|
|
* We actually implement this as a varlena so that we don't have to pass in
|
|
* the length for the comparison functions. (The difference between these
|
|
* types and "text" is that we truncate and possibly blank-pad the string
|
|
* at insertion time.)
|
|
*
|
|
* - ay 6/95
|
|
*/
|
|
|
|
|
|
/*****************************************************************************
|
|
* bpchar - char() *
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Convert a C string to CHARACTER internal representation. atttypmod
|
|
* is the declared length of the type plus VARHDRSZ.
|
|
*
|
|
* If the C string is too long, raise an error, unless the extra
|
|
* characters are spaces, in which case they're truncated. (per SQL)
|
|
*/
|
|
Datum
|
|
bpcharin(PG_FUNCTION_ARGS)
|
|
{
|
|
char *s = PG_GETARG_CSTRING(0);
|
|
|
|
#ifdef NOT_USED
|
|
Oid typelem = PG_GETARG_OID(1);
|
|
#endif
|
|
int32 atttypmod = PG_GETARG_INT32(2);
|
|
BpChar *result;
|
|
char *r;
|
|
size_t len,
|
|
maxlen;
|
|
int i;
|
|
int charlen; /* number of charcters in the input string */
|
|
|
|
/* verify encoding */
|
|
len = strlen(s);
|
|
pg_verifymbstr(s, len, false);
|
|
|
|
charlen = pg_mbstrlen(s);
|
|
|
|
/* If typmod is -1 (or invalid), use the actual string length */
|
|
if (atttypmod < (int32) VARHDRSZ)
|
|
maxlen = charlen;
|
|
else
|
|
maxlen = atttypmod - VARHDRSZ;
|
|
|
|
if (charlen > maxlen)
|
|
{
|
|
/* Verify that extra characters are spaces, and clip them off */
|
|
size_t mbmaxlen = pg_mbcharcliplen(s, len, maxlen);
|
|
|
|
/*
|
|
* at this point, len is the actual BYTE length of the input
|
|
* string, maxlen is the max number of CHARACTERS allowed for this
|
|
* bpchar type.
|
|
*/
|
|
if (strspn(s + mbmaxlen, " ") == len - mbmaxlen)
|
|
len = mbmaxlen;
|
|
else
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_STRING_DATA_LENGTH_MISMATCH),
|
|
errmsg("value too long for type character(%d)",
|
|
(int) maxlen)));
|
|
|
|
/*
|
|
* XXX: at this point, maxlen is the necessary byte length, not
|
|
* the number of CHARACTERS!
|
|
*/
|
|
maxlen = len;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* XXX: at this point, maxlen is the necessary byte length, not
|
|
* the number of CHARACTERS!
|
|
*/
|
|
maxlen = len + (maxlen - charlen);
|
|
}
|
|
|
|
result = palloc(maxlen + VARHDRSZ);
|
|
VARATT_SIZEP(result) = maxlen + VARHDRSZ;
|
|
r = VARDATA(result);
|
|
for (i = 0; i < len; i++)
|
|
*r++ = *s++;
|
|
|
|
/* blank pad the string if necessary */
|
|
for (; i < maxlen; i++)
|
|
*r++ = ' ';
|
|
|
|
PG_RETURN_BPCHAR_P(result);
|
|
}
|
|
|
|
|
|
/*
|
|
* Convert a CHARACTER value to a C string.
|
|
*/
|
|
Datum
|
|
bpcharout(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *s = PG_GETARG_BPCHAR_P(0);
|
|
char *result;
|
|
int len;
|
|
|
|
/* copy and add null term */
|
|
len = VARSIZE(s) - VARHDRSZ;
|
|
result = (char *) palloc(len + 1);
|
|
memcpy(result, VARDATA(s), len);
|
|
result[len] = '\0';
|
|
|
|
PG_RETURN_CSTRING(result);
|
|
}
|
|
|
|
/*
|
|
* bpcharrecv - converts external binary format to bpchar
|
|
*/
|
|
Datum
|
|
bpcharrecv(PG_FUNCTION_ARGS)
|
|
{
|
|
/* Exactly the same as textrecv, so share code */
|
|
return textrecv(fcinfo);
|
|
}
|
|
|
|
/*
|
|
* bpcharsend - converts bpchar to binary format
|
|
*/
|
|
Datum
|
|
bpcharsend(PG_FUNCTION_ARGS)
|
|
{
|
|
/* Exactly the same as textsend, so share code */
|
|
return textsend(fcinfo);
|
|
}
|
|
|
|
|
|
/*
|
|
* Converts a CHARACTER type to the specified size.
|
|
*
|
|
* maxlen is the typmod, ie, declared length plus VARHDRSZ bytes.
|
|
* isExplicit is true if this is for an explicit cast to char(N).
|
|
*
|
|
* Truncation rules: for an explicit cast, silently truncate to the given
|
|
* length; for an implicit cast, raise error unless extra characters are
|
|
* all spaces. (This is sort-of per SQL: the spec would actually have us
|
|
* raise a "completion condition" for the explicit cast case, but Postgres
|
|
* hasn't got such a concept.)
|
|
*/
|
|
Datum
|
|
bpchar(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *source = PG_GETARG_BPCHAR_P(0);
|
|
int32 maxlen = PG_GETARG_INT32(1);
|
|
bool isExplicit = PG_GETARG_BOOL(2);
|
|
BpChar *result;
|
|
int32 len;
|
|
char *r;
|
|
char *s;
|
|
int i;
|
|
int charlen; /* number of charcters in the input string
|
|
* + VARHDRSZ */
|
|
|
|
len = VARSIZE(source);
|
|
|
|
charlen = pg_mbstrlen_with_len(VARDATA(source), len - VARHDRSZ) + VARHDRSZ;
|
|
|
|
/* No work if typmod is invalid or supplied data matches it already */
|
|
if (maxlen < (int32) VARHDRSZ || charlen == maxlen)
|
|
PG_RETURN_BPCHAR_P(source);
|
|
|
|
if (charlen > maxlen)
|
|
{
|
|
/* Verify that extra characters are spaces, and clip them off */
|
|
size_t maxmblen;
|
|
|
|
maxmblen = pg_mbcharcliplen(VARDATA(source), len - VARHDRSZ,
|
|
maxlen - VARHDRSZ) + VARHDRSZ;
|
|
|
|
if (!isExplicit)
|
|
{
|
|
for (i = maxmblen - VARHDRSZ; i < len - VARHDRSZ; i++)
|
|
if (*(VARDATA(source) + i) != ' ')
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_STRING_DATA_LENGTH_MISMATCH),
|
|
errmsg("value too long for type character(%d)",
|
|
maxlen - VARHDRSZ)));
|
|
}
|
|
|
|
len = maxmblen;
|
|
|
|
/*
|
|
* XXX: at this point, maxlen is the necessary byte
|
|
* length+VARHDRSZ, not the number of CHARACTERS!
|
|
*/
|
|
maxlen = len;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* XXX: at this point, maxlen is the necessary byte
|
|
* length+VARHDRSZ, not the number of CHARACTERS!
|
|
*/
|
|
maxlen = len + (maxlen - charlen);
|
|
}
|
|
|
|
s = VARDATA(source);
|
|
|
|
result = palloc(maxlen);
|
|
VARATT_SIZEP(result) = maxlen;
|
|
r = VARDATA(result);
|
|
|
|
for (i = 0; i < len - VARHDRSZ; i++)
|
|
*r++ = *s++;
|
|
|
|
/* blank pad the string if necessary */
|
|
for (; i < maxlen - VARHDRSZ; i++)
|
|
*r++ = ' ';
|
|
|
|
PG_RETURN_BPCHAR_P(result);
|
|
}
|
|
|
|
|
|
/* char_bpchar()
|
|
* Convert char to bpchar(1).
|
|
*/
|
|
Datum
|
|
char_bpchar(PG_FUNCTION_ARGS)
|
|
{
|
|
char c = PG_GETARG_CHAR(0);
|
|
BpChar *result;
|
|
|
|
result = (BpChar *) palloc(VARHDRSZ + 1);
|
|
|
|
VARATT_SIZEP(result) = VARHDRSZ + 1;
|
|
*(VARDATA(result)) = c;
|
|
|
|
PG_RETURN_BPCHAR_P(result);
|
|
}
|
|
|
|
|
|
/* bpchar_name()
|
|
* Converts a bpchar() type to a NameData type.
|
|
*/
|
|
Datum
|
|
bpchar_name(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *s = PG_GETARG_BPCHAR_P(0);
|
|
Name result;
|
|
int len;
|
|
|
|
len = VARSIZE(s) - VARHDRSZ;
|
|
|
|
/* Truncate to max length for a Name */
|
|
if (len >= NAMEDATALEN)
|
|
len = NAMEDATALEN - 1;
|
|
|
|
/* Remove trailing blanks */
|
|
while (len > 0)
|
|
{
|
|
if (*(VARDATA(s) + len - 1) != ' ')
|
|
break;
|
|
len--;
|
|
}
|
|
|
|
result = (NameData *) palloc(NAMEDATALEN);
|
|
memcpy(NameStr(*result), VARDATA(s), len);
|
|
|
|
/* Now null pad to full length... */
|
|
while (len < NAMEDATALEN)
|
|
{
|
|
*(NameStr(*result) + len) = '\0';
|
|
len++;
|
|
}
|
|
|
|
PG_RETURN_NAME(result);
|
|
}
|
|
|
|
/* name_bpchar()
|
|
* Converts a NameData type to a bpchar type.
|
|
*/
|
|
Datum
|
|
name_bpchar(PG_FUNCTION_ARGS)
|
|
{
|
|
Name s = PG_GETARG_NAME(0);
|
|
BpChar *result;
|
|
int len;
|
|
|
|
len = strlen(NameStr(*s));
|
|
result = (BpChar *) palloc(VARHDRSZ + len);
|
|
memcpy(VARDATA(result), NameStr(*s), len);
|
|
VARATT_SIZEP(result) = len + VARHDRSZ;
|
|
|
|
PG_RETURN_BPCHAR_P(result);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* varchar - varchar(n)
|
|
*
|
|
* Note: varchar piggybacks on type text for most operations, and so has no
|
|
* C-coded functions except for I/O and typmod checking.
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Convert a C string to VARCHAR internal representation. atttypmod
|
|
* is the declared length of the type plus VARHDRSZ.
|
|
*
|
|
* Note that atttypmod is regarded as the number of characters, which
|
|
* is not necessarily the same as the number of bytes.
|
|
*
|
|
* If the C string is too long, raise an error, unless the extra characters
|
|
* are spaces, in which case they're truncated. (per SQL)
|
|
*/
|
|
Datum
|
|
varcharin(PG_FUNCTION_ARGS)
|
|
{
|
|
char *s = PG_GETARG_CSTRING(0);
|
|
|
|
#ifdef NOT_USED
|
|
Oid typelem = PG_GETARG_OID(1);
|
|
#endif
|
|
int32 atttypmod = PG_GETARG_INT32(2);
|
|
VarChar *result;
|
|
size_t len,
|
|
maxlen;
|
|
|
|
/* verify encoding */
|
|
len = strlen(s);
|
|
pg_verifymbstr(s, len, false);
|
|
|
|
maxlen = atttypmod - VARHDRSZ;
|
|
|
|
if (atttypmod >= (int32) VARHDRSZ && len > maxlen)
|
|
{
|
|
/* Verify that extra characters are spaces, and clip them off */
|
|
size_t mbmaxlen = pg_mbcharcliplen(s, len, maxlen);
|
|
|
|
if (strspn(s + mbmaxlen, " ") == len - mbmaxlen)
|
|
len = mbmaxlen;
|
|
else
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_STRING_DATA_LENGTH_MISMATCH),
|
|
errmsg("value too long for type character varying(%d)",
|
|
(int) maxlen)));
|
|
}
|
|
|
|
result = palloc(len + VARHDRSZ);
|
|
VARATT_SIZEP(result) = len + VARHDRSZ;
|
|
memcpy(VARDATA(result), s, len);
|
|
|
|
PG_RETURN_VARCHAR_P(result);
|
|
}
|
|
|
|
|
|
/*
|
|
* Convert a VARCHAR value to a C string.
|
|
*/
|
|
Datum
|
|
varcharout(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *s = PG_GETARG_VARCHAR_P(0);
|
|
char *result;
|
|
int32 len;
|
|
|
|
/* copy and add null term */
|
|
len = VARSIZE(s) - VARHDRSZ;
|
|
result = palloc(len + 1);
|
|
memcpy(result, VARDATA(s), len);
|
|
result[len] = '\0';
|
|
|
|
PG_RETURN_CSTRING(result);
|
|
}
|
|
|
|
/*
|
|
* varcharrecv - converts external binary format to varchar
|
|
*/
|
|
Datum
|
|
varcharrecv(PG_FUNCTION_ARGS)
|
|
{
|
|
/* Exactly the same as textrecv, so share code */
|
|
return textrecv(fcinfo);
|
|
}
|
|
|
|
/*
|
|
* varcharsend - converts varchar to binary format
|
|
*/
|
|
Datum
|
|
varcharsend(PG_FUNCTION_ARGS)
|
|
{
|
|
/* Exactly the same as textsend, so share code */
|
|
return textsend(fcinfo);
|
|
}
|
|
|
|
|
|
/*
|
|
* Converts a VARCHAR type to the specified size.
|
|
*
|
|
* maxlen is the typmod, ie, declared length plus VARHDRSZ bytes.
|
|
* isExplicit is true if this is for an explicit cast to varchar(N).
|
|
*
|
|
* Truncation rules: for an explicit cast, silently truncate to the given
|
|
* length; for an implicit cast, raise error unless extra characters are
|
|
* all spaces. (This is sort-of per SQL: the spec would actually have us
|
|
* raise a "completion condition" for the explicit cast case, but Postgres
|
|
* hasn't got such a concept.)
|
|
*/
|
|
Datum
|
|
varchar(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *source = PG_GETARG_VARCHAR_P(0);
|
|
int32 maxlen = PG_GETARG_INT32(1);
|
|
bool isExplicit = PG_GETARG_BOOL(2);
|
|
VarChar *result;
|
|
int32 len;
|
|
size_t maxmblen;
|
|
int i;
|
|
|
|
len = VARSIZE(source);
|
|
/* No work if typmod is invalid or supplied data fits it already */
|
|
if (maxlen < (int32) VARHDRSZ || len <= maxlen)
|
|
PG_RETURN_VARCHAR_P(source);
|
|
|
|
/* only reach here if string is too long... */
|
|
|
|
/* truncate multibyte string preserving multibyte boundary */
|
|
maxmblen = pg_mbcharcliplen(VARDATA(source), len - VARHDRSZ,
|
|
maxlen - VARHDRSZ);
|
|
|
|
if (!isExplicit)
|
|
{
|
|
for (i = maxmblen; i < len - VARHDRSZ; i++)
|
|
if (*(VARDATA(source) + i) != ' ')
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_STRING_DATA_LENGTH_MISMATCH),
|
|
errmsg("value too long for type character varying(%d)",
|
|
maxlen - VARHDRSZ)));
|
|
}
|
|
|
|
len = maxmblen + VARHDRSZ;
|
|
result = palloc(len);
|
|
VARATT_SIZEP(result) = len;
|
|
memcpy(VARDATA(result), VARDATA(source), len - VARHDRSZ);
|
|
|
|
PG_RETURN_VARCHAR_P(result);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Exported functions
|
|
*****************************************************************************/
|
|
|
|
/* "True" length (not counting trailing blanks) of a BpChar */
|
|
static int
|
|
bcTruelen(BpChar *arg)
|
|
{
|
|
char *s = VARDATA(arg);
|
|
int i;
|
|
int len;
|
|
|
|
len = VARSIZE(arg) - VARHDRSZ;
|
|
for (i = len - 1; i >= 0; i--)
|
|
{
|
|
if (s[i] != ' ')
|
|
break;
|
|
}
|
|
return i + 1;
|
|
}
|
|
|
|
Datum
|
|
bpcharlen(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg = PG_GETARG_BPCHAR_P(0);
|
|
int len;
|
|
|
|
/* get number of bytes, ignoring trailing spaces */
|
|
len = bcTruelen(arg);
|
|
|
|
/* in multibyte encoding, convert to number of characters */
|
|
if (pg_database_encoding_max_length() != 1)
|
|
len = pg_mbstrlen_with_len(VARDATA(arg), len);
|
|
|
|
PG_RETURN_INT32(len);
|
|
}
|
|
|
|
Datum
|
|
bpcharoctetlen(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg = PG_GETARG_BPCHAR_P(0);
|
|
|
|
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Comparison Functions used for bpchar
|
|
*
|
|
* Note: btree indexes need these routines not to leak memory; therefore,
|
|
* be careful to free working copies of toasted datums. Most places don't
|
|
* need to be so careful.
|
|
*****************************************************************************/
|
|
|
|
Datum
|
|
bpchareq(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
bool result;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
/* fast path for different-length inputs */
|
|
if (len1 != len2)
|
|
result = false;
|
|
else
|
|
result = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) == 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
bpcharne(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
bool result;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
/* fast path for different-length inputs */
|
|
if (len1 != len2)
|
|
result = true;
|
|
else
|
|
result = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) != 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
bpcharlt(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp < 0);
|
|
}
|
|
|
|
Datum
|
|
bpcharle(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp <= 0);
|
|
}
|
|
|
|
Datum
|
|
bpchargt(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp > 0);
|
|
}
|
|
|
|
Datum
|
|
bpcharge(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp >= 0);
|
|
}
|
|
|
|
Datum
|
|
bpcharcmp(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_INT32(cmp);
|
|
}
|
|
|
|
|
|
/*
|
|
* bpchar needs a specialized hash function because we want to ignore
|
|
* trailing blanks in comparisons.
|
|
*
|
|
* XXX is there any need for locale-specific behavior here?
|
|
*/
|
|
Datum
|
|
hashbpchar(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *key = PG_GETARG_BPCHAR_P(0);
|
|
char *keydata;
|
|
int keylen;
|
|
Datum result;
|
|
|
|
keydata = VARDATA(key);
|
|
keylen = bcTruelen(key);
|
|
|
|
result = hash_any((unsigned char *) keydata, keylen);
|
|
|
|
/* Avoid leaking memory for toasted inputs */
|
|
PG_FREE_IF_COPY(key, 0);
|
|
|
|
return result;
|
|
}
|