318 lines
7.0 KiB
C
318 lines
7.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* format_type.c
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* Display type names "nicely".
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*
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/format_type.c,v 1.5 2000/08/26 21:53:41 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <ctype.h>
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#include "fmgr.h"
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#include "catalog/pg_type.h"
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#include "utils/builtins.h"
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#include "utils/numeric.h"
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#include "utils/syscache.h"
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#define MAX_INT32_LEN 11
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#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str))
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static char *format_type_internal(Oid type_oid, int32 typemod);
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static char *
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psnprintf(size_t len, const char * fmt, ...)
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{
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va_list ap;
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char * buf;
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buf = palloc(len);
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va_start(ap, fmt);
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vsnprintf(buf, len, fmt, ap);
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va_end(ap);
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return buf;
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}
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/*
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* SQL function: format_type(type_oid, typemod)
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*
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* `type_oid' is from pg_type.oid, `typemod' is from
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* pg_attribute.atttypmod. This function will get the type name and
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* format it and the modifier to canonical SQL format, if the type is
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* a standard type. Otherwise you just get pg_type.typname back,
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* double quoted if it contains funny characters.
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*
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* If typemod is null (in the SQL sense) then you won't get any
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* "..(x)" type qualifiers. The result is not technically correct,
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* because the various types interpret missing type modifiers
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* differently, but it can be used as a convenient way to format
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* system catalogs, e.g., pg_aggregate, in psql.
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*/
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Datum
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format_type(PG_FUNCTION_ARGS)
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{
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Oid type_oid;
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int32 typemod;
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char *result;
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if (PG_ARGISNULL(0))
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PG_RETURN_NULL();
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type_oid = PG_GETARG_OID(0);
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if (!PG_ARGISNULL(1))
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typemod = PG_GETARG_INT32(1);
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else
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typemod = -1; /* default typmod */
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result = format_type_internal(type_oid, typemod);
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PG_RETURN_DATUM(_textin(result));
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}
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static char *
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format_type_internal(Oid type_oid, int32 typemod)
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{
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bool with_typemod = (typemod >= 0);
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HeapTuple tuple;
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Oid array_base_type;
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int16 typlen;
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bool is_array;
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char *name;
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char *buf;
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if (type_oid == InvalidOid)
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return pstrdup("-");
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tuple = SearchSysCacheTuple(TYPEOID, ObjectIdGetDatum(type_oid),
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0, 0, 0);
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if (!HeapTupleIsValid(tuple))
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return pstrdup("???");
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array_base_type = ((Form_pg_type) GETSTRUCT(tuple))->typelem;
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typlen = ((Form_pg_type) GETSTRUCT(tuple))->typlen;
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if (array_base_type != 0 && typlen < 0)
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{
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tuple = SearchSysCacheTuple(TYPEOID,
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ObjectIdGetDatum(array_base_type),
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0, 0, 0);
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if (!HeapTupleIsValid(tuple))
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return pstrdup("???[]");
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is_array = true;
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type_oid = array_base_type;
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}
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else
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is_array = false;
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switch (type_oid)
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{
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case BOOLOID:
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buf = pstrdup("boolean");
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break;
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case BPCHAROID:
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if (with_typemod)
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buf = psnprintf(11 + MAX_INT32_LEN + 1, "character(%d)",
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(int) (typemod - VARHDRSZ));
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else
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buf = pstrdup("character");
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break;
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case CHAROID:
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/* This char type is the single-byte version. You have to
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* double-quote it to get at it in the parser.
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*/
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buf = pstrdup("\"char\"");
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break;
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case FLOAT4OID:
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buf = pstrdup("real");
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break;
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case FLOAT8OID:
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buf = pstrdup("double precision");
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break;
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case INT2OID:
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buf = pstrdup("smallint");
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break;
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case INT4OID:
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buf = pstrdup("integer");
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break;
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case INT8OID:
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buf = pstrdup("bigint");
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break;
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case NUMERICOID:
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if (with_typemod)
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buf = psnprintf(10 + 2 * MAX_INT32_LEN + 1, "numeric(%d,%d)",
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((typemod - VARHDRSZ) >> 16) & 0xffff,
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(typemod - VARHDRSZ) & 0xffff);
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else
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buf = pstrdup("numeric");
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break;
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case TIMETZOID:
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buf = pstrdup("time with time zone");
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break;
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case VARBITOID:
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if (with_typemod)
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buf = psnprintf(13 + MAX_INT32_LEN + 1, "bit varying(%d)",
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(int) typemod);
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else
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buf = pstrdup("bit varying");
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break;
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case VARCHAROID:
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if (with_typemod)
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buf = psnprintf(19 + MAX_INT32_LEN + 1,
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"character varying(%d)",
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(int) (typemod - VARHDRSZ));
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else
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buf = pstrdup("character varying");
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break;
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case ZPBITOID:
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if (with_typemod)
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buf = psnprintf(5 + MAX_INT32_LEN + 1, "bit(%d)",
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(int) typemod);
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else
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buf = pstrdup("bit");
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break;
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default:
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name = NameStr(((Form_pg_type) GETSTRUCT(tuple))->typname);
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if (strspn(name, "abcdefghijklmnopqrstuvwxyz0123456789_") != strlen(name)
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|| isdigit((int) name[0]))
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buf = psnprintf(strlen(name) + 3, "\"%s\"", name);
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else
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buf = pstrdup(name);
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break;
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}
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if (is_array)
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buf = psnprintf(strlen(buf) + 3, "%s[]", buf);
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return buf;
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}
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/*
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* type_maximum_size --- determine maximum length of a varlena column
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*
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* If the max length is indeterminate, return -1. In particular, we return
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* -1 for any type not known to this routine. We assume the caller has
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* already determined that the type is a varlena type, so it's not
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* necessary to look up the type's pg_type tuple here.
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*
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* This may appear unrelated to format_type(), but in fact the two routines
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* share knowledge of the encoding of typmod for different types, so it's
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* convenient to keep them together.
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*/
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int32
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type_maximum_size(Oid type_oid, int32 typemod)
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{
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if (typemod <= 0)
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return -1;
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switch (type_oid)
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{
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case BPCHAROID:
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case VARCHAROID:
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/* typemod includes varlena header */
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return typemod;
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case NUMERICOID:
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/* precision (ie, max # of digits) is in upper bits of typmod */
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if (typemod > VARHDRSZ)
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{
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int precision = ((typemod - VARHDRSZ) >> 16) & 0xffff;
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/* Numeric stores 2 decimal digits/byte, plus header */
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return (precision + 1) / 2 + NUMERIC_HDRSZ;
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}
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break;
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case VARBITOID:
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case ZPBITOID:
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/* typemod is the (max) number of bits */
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return (typemod + (BITS_PER_BYTE-1)) / BITS_PER_BYTE
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+ 2 * sizeof(int32);
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}
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/* Unknown type, or unlimited-length type such as 'text' */
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return -1;
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}
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/*
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* oidvectortypes - converts a vector of type OIDs to "typname" list
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*
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* The interface for this function is wrong: it should be told how many
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* OIDs are significant in the input vector, so that trailing InvalidOid
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* argument types can be recognized.
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*/
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Datum
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oidvectortypes(PG_FUNCTION_ARGS)
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{
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Oid *oidArray = (Oid *) PG_GETARG_POINTER(0);
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char *result;
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int numargs;
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int num;
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size_t total;
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size_t left;
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/* Try to guess how many args there are :-( */
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numargs = 0;
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for (num = 0; num < FUNC_MAX_ARGS; num++)
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{
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if (oidArray[num] != InvalidOid)
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numargs = num + 1;
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}
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total = 20 * numargs + 1;
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result = palloc(total);
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result[0] = '\0';
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left = total - 1;
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for (num = 0; num < numargs; num++)
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{
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char * typename = format_type_internal(oidArray[num], -1);
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if (left < strlen(typename) + 2)
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{
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total += strlen(typename) + 2;
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result = repalloc(result, total);
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left += strlen(typename) + 2;
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}
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if (num > 0)
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{
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strcat(result, ", ");
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left -= 2;
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}
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strcat(result, typename);
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left -= strlen(typename);
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}
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PG_RETURN_DATUM(_textin(result));
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}
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