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Support type modifiers for user-defined types, and pull most knowledge

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about typmod representation for standard types out into type-specific
typmod I/O functions.  Teodor Sigaev, with some editorialization by
Tom Lane.
This commit is contained in:
Tom Lane
2006-12-30 21:21:56 +00:00
parent 24b1f14eae
commit 5725b9d9af
47 changed files with 1628 additions and 685 deletions
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89
src/backend/utils/adt/varchar.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/varchar.c,v 1.119 2006/10/04 00:30:00 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/varchar.c,v 1.120 2006/12/30 21:21:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -17,10 +17,65 @@
#include "access/hash.h"
#include "libpq/pqformat.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "mb/pg_wchar.h"
/* common code for bpchartypmodin and varchartypmodin */
static int32
anychar_typmodin(ArrayType *ta, const char *typename)
{
int32 typmod;
int32 *tl;
int n;
tl = ArrayGetTypmods(ta, &n);
/*
* we're not too tense about good error message here because grammar
* shouldn't allow wrong number of modifiers for CHAR
*/
if (n != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid type modifier")));
if (*tl < 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("length for type %s must be at least 1", typename)));
if (*tl > MaxAttrSize)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("length for type %s cannot exceed %d",
typename, MaxAttrSize)));
/*
* For largely historical reasons, the typmod is VARHDRSZ plus the
* number of characters; there is enough client-side code that knows
* about that that we'd better not change it.
*/
typmod = VARHDRSZ + *tl;
return typmod;
}
/* common code for bpchartypmodout and varchartypmodout */
static char *
anychar_typmodout(int32 typmod)
{
char *res = (char *) palloc(64);
if (typmod > VARHDRSZ)
snprintf(res, 64, "(%d)", (int) (typmod - VARHDRSZ));
else
*res = '\0';
return res;
}
/*
* CHAR() and VARCHAR() types are part of the ANSI SQL standard. CHAR()
* is for blank-padded string whose length is specified in CREATE TABLE.
@ -359,6 +414,22 @@ name_bpchar(PG_FUNCTION_ARGS)
PG_RETURN_BPCHAR_P(result);
}
Datum
bpchartypmodin(PG_FUNCTION_ARGS)
{
ArrayType *ta = PG_GETARG_ARRAYTYPE_P(0);
PG_RETURN_INT32(anychar_typmodin(ta, "char"));
}
Datum
bpchartypmodout(PG_FUNCTION_ARGS)
{
int32 typmod = PG_GETARG_INT32(0);
PG_RETURN_CSTRING(anychar_typmodout(typmod));
}
/*****************************************************************************
* varchar - varchar(n)
@ -536,6 +607,22 @@ varchar(PG_FUNCTION_ARGS)
PG_RETURN_VARCHAR_P(result);
}
Datum
varchartypmodin(PG_FUNCTION_ARGS)
{
ArrayType *ta = PG_GETARG_ARRAYTYPE_P(0);
PG_RETURN_INT32(anychar_typmodin(ta, "varchar"));
}
Datum
varchartypmodout(PG_FUNCTION_ARGS)
{
int32 typmod = PG_GETARG_INT32(0);
PG_RETURN_CSTRING(anychar_typmodout(typmod));
}
/*****************************************************************************
* Exported functions