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39b7ec3309
rid of the assumption that sizeof(Oid)==sizeof(int). This is one small step towards someday supporting 8-byte OIDs. For the moment, it doesn't do much except get rid of a lot of unsightly casts.
303 lines
6.4 KiB
C
303 lines
6.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* name.c
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* Functions for the built-in type "name".
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* name replaces char16 and is carefully implemented so that it
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* is a string of length NAMEDATALEN. DO NOT use hard-coded constants anywhere
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* always use NAMEDATALEN as the symbolic constant! - jolly 8/21/95
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*
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*
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/name.c,v 1.42 2003/02/09 06:56:28 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 "catalog/namespace.h"
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#include "catalog/pg_type.h"
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#include "miscadmin.h"
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#include "utils/array.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "mb/pg_wchar.h"
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/*****************************************************************************
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* USER I/O ROUTINES (none) *
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*****************************************************************************/
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/*
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* namein - converts "..." to internal representation
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*
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* Note:
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* [Old] Currently if strlen(s) < NAMEDATALEN, the extra chars are nulls
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* Now, always NULL terminated
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*/
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Datum
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namein(PG_FUNCTION_ARGS)
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{
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char *s = PG_GETARG_CSTRING(0);
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NameData *result;
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int len;
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char *ermsg;
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/* veryfy encoding */
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len = strlen(s);
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if ((ermsg = pg_verifymbstr(s, len)))
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elog(ERROR, "%s", ermsg);
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len = pg_mbcliplen(s, len, NAMEDATALEN - 1);
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result = (NameData *) palloc(NAMEDATALEN);
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/* always keep it null-padded */
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memset(result, 0, NAMEDATALEN);
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memcpy(NameStr(*result), s, len);
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PG_RETURN_NAME(result);
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}
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/*
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* nameout - converts internal representation to "..."
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*/
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Datum
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nameout(PG_FUNCTION_ARGS)
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{
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Name s = PG_GETARG_NAME(0);
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PG_RETURN_CSTRING(pstrdup(NameStr(*s)));
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}
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/*****************************************************************************
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* PUBLIC ROUTINES *
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*****************************************************************************/
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/*
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* nameeq - returns 1 iff arguments are equal
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* namene - returns 1 iff arguments are not equal
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*
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* BUGS:
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* Assumes that "xy\0\0a" should be equal to "xy\0b".
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* If not, can do the comparison backwards for efficiency.
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*
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* namelt - returns 1 iff a < b
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* namele - returns 1 iff a <= b
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* namegt - returns 1 iff a < b
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* namege - returns 1 iff a <= b
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*
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*/
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Datum
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nameeq(PG_FUNCTION_ARGS)
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{
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Name arg1 = PG_GETARG_NAME(0);
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Name arg2 = PG_GETARG_NAME(1);
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PG_RETURN_BOOL(strncmp(NameStr(*arg1), NameStr(*arg2), NAMEDATALEN) == 0);
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}
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Datum
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namene(PG_FUNCTION_ARGS)
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{
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Name arg1 = PG_GETARG_NAME(0);
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Name arg2 = PG_GETARG_NAME(1);
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PG_RETURN_BOOL(strncmp(NameStr(*arg1), NameStr(*arg2), NAMEDATALEN) != 0);
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}
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Datum
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namelt(PG_FUNCTION_ARGS)
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{
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Name arg1 = PG_GETARG_NAME(0);
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Name arg2 = PG_GETARG_NAME(1);
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PG_RETURN_BOOL(strncmp(NameStr(*arg1), NameStr(*arg2), NAMEDATALEN) < 0);
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}
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Datum
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namele(PG_FUNCTION_ARGS)
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{
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Name arg1 = PG_GETARG_NAME(0);
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Name arg2 = PG_GETARG_NAME(1);
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PG_RETURN_BOOL(strncmp(NameStr(*arg1), NameStr(*arg2), NAMEDATALEN) <= 0);
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}
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Datum
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namegt(PG_FUNCTION_ARGS)
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{
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Name arg1 = PG_GETARG_NAME(0);
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Name arg2 = PG_GETARG_NAME(1);
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PG_RETURN_BOOL(strncmp(NameStr(*arg1), NameStr(*arg2), NAMEDATALEN) > 0);
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}
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Datum
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namege(PG_FUNCTION_ARGS)
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{
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Name arg1 = PG_GETARG_NAME(0);
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Name arg2 = PG_GETARG_NAME(1);
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PG_RETURN_BOOL(strncmp(NameStr(*arg1), NameStr(*arg2), NAMEDATALEN) >= 0);
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}
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/* (see char.c for comparison/operation routines) */
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int
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namecpy(Name n1, Name n2)
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{
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if (!n1 || !n2)
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return -1;
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strncpy(NameStr(*n1), NameStr(*n2), NAMEDATALEN);
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return 0;
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}
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#ifdef NOT_USED
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int
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namecat(Name n1, Name n2)
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{
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return namestrcat(n1, NameStr(*n2)); /* n2 can't be any longer
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* than n1 */
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}
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#endif
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#ifdef NOT_USED
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int
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namecmp(Name n1, Name n2)
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{
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return strncmp(NameStr(*n1), NameStr(*n2), NAMEDATALEN);
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}
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#endif
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int
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namestrcpy(Name name, const char *str)
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{
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if (!name || !str)
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return -1;
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StrNCpy(NameStr(*name), str, NAMEDATALEN);
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return 0;
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}
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#ifdef NOT_USED
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int
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namestrcat(Name name, const char *str)
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{
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int i;
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char *p,
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*q;
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if (!name || !str)
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return -1;
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for (i = 0, p = NameStr(*name); i < NAMEDATALEN && *p; ++i, ++p)
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;
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for (q = str; i < NAMEDATALEN; ++i, ++p, ++q)
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{
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*p = *q;
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if (!*q)
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break;
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}
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return 0;
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}
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#endif
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int
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namestrcmp(Name name, const char *str)
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{
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if (!name && !str)
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return 0;
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if (!name)
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return -1; /* NULL < anything */
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if (!str)
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return 1; /* NULL < anything */
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return strncmp(NameStr(*name), str, NAMEDATALEN);
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}
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/*
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* SQL-functions CURRENT_USER, SESSION_USER
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*/
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Datum
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current_user(PG_FUNCTION_ARGS)
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{
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PG_RETURN_DATUM(DirectFunctionCall1(namein, CStringGetDatum(GetUserNameFromId(GetUserId()))));
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}
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Datum
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session_user(PG_FUNCTION_ARGS)
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{
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PG_RETURN_DATUM(DirectFunctionCall1(namein, CStringGetDatum(GetUserNameFromId(GetSessionUserId()))));
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}
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/*
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* SQL-functions CURRENT_SCHEMA, CURRENT_SCHEMAS
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*/
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Datum
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current_schema(PG_FUNCTION_ARGS)
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{
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List *search_path = fetch_search_path(false);
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char *nspname;
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if (search_path == NIL)
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PG_RETURN_NULL();
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nspname = get_namespace_name(lfirsto(search_path));
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PG_RETURN_DATUM(DirectFunctionCall1(namein, CStringGetDatum(nspname)));
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}
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Datum
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current_schemas(PG_FUNCTION_ARGS)
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{
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List *search_path = fetch_search_path(PG_GETARG_BOOL(0));
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int nnames = length(search_path);
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Datum *names;
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int i;
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ArrayType *array;
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/* +1 here is just to avoid palloc(0) error */
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names = (Datum *) palloc((nnames + 1) * sizeof(Datum));
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i = 0;
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while (search_path)
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{
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char *nspname;
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nspname = get_namespace_name(lfirsto(search_path));
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names[i] = DirectFunctionCall1(namein, CStringGetDatum(nspname));
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i++;
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search_path = lnext(search_path);
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}
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array = construct_array(names, nnames,
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NAMEOID,
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NAMEDATALEN, /* sizeof(Name) */
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false, /* Name is not by-val */
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'i'); /* alignment of Name */
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PG_RETURN_POINTER(array);
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}
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/*****************************************************************************
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* PRIVATE ROUTINES *
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*****************************************************************************/
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#ifdef NOT_USED
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uint32
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NameComputeLength(Name name)
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{
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char *charP;
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int length;
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for (length = 0, charP = NameStr(*name);
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length < NAMEDATALEN && *charP != '\0';
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length++, charP++)
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;
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return (uint32) length;
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}
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#endif
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