348 lines
8.9 KiB
C
348 lines
8.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* collationcmds.c
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* collation-related commands support code
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*
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* Portions Copyright (c) 1996-2017, 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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* src/backend/commands/collationcmds.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/htup_details.h"
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#include "access/xact.h"
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#include "catalog/dependency.h"
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#include "catalog/indexing.h"
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#include "catalog/namespace.h"
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#include "catalog/pg_collation.h"
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#include "catalog/pg_collation_fn.h"
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#include "commands/alter.h"
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#include "commands/collationcmds.h"
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#include "commands/dbcommands.h"
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#include "commands/defrem.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/pg_locale.h"
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#include "utils/rel.h"
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#include "utils/syscache.h"
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/*
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* CREATE COLLATION
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*/
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ObjectAddress
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DefineCollation(ParseState *pstate, List *names, List *parameters)
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{
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char *collName;
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Oid collNamespace;
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AclResult aclresult;
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ListCell *pl;
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DefElem *fromEl = NULL;
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DefElem *localeEl = NULL;
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DefElem *lccollateEl = NULL;
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DefElem *lcctypeEl = NULL;
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char *collcollate = NULL;
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char *collctype = NULL;
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Oid newoid;
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ObjectAddress address;
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collNamespace = QualifiedNameGetCreationNamespace(names, &collName);
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aclresult = pg_namespace_aclcheck(collNamespace, GetUserId(), ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
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get_namespace_name(collNamespace));
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foreach(pl, parameters)
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{
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DefElem *defel = castNode(DefElem, lfirst(pl));
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DefElem **defelp;
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if (pg_strcasecmp(defel->defname, "from") == 0)
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defelp = &fromEl;
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else if (pg_strcasecmp(defel->defname, "locale") == 0)
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defelp = &localeEl;
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else if (pg_strcasecmp(defel->defname, "lc_collate") == 0)
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defelp = &lccollateEl;
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else if (pg_strcasecmp(defel->defname, "lc_ctype") == 0)
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defelp = &lcctypeEl;
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else
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{
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("collation attribute \"%s\" not recognized",
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defel->defname),
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parser_errposition(pstate, defel->location)));
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break;
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}
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*defelp = defel;
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}
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if ((localeEl && (lccollateEl || lcctypeEl))
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|| (fromEl && list_length(parameters) != 1))
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("conflicting or redundant options")));
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if (fromEl)
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{
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Oid collid;
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HeapTuple tp;
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collid = get_collation_oid(defGetQualifiedName(fromEl), false);
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tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
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if (!HeapTupleIsValid(tp))
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elog(ERROR, "cache lookup failed for collation %u", collid);
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collcollate = pstrdup(NameStr(((Form_pg_collation) GETSTRUCT(tp))->collcollate));
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collctype = pstrdup(NameStr(((Form_pg_collation) GETSTRUCT(tp))->collctype));
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ReleaseSysCache(tp);
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}
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if (localeEl)
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{
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collcollate = defGetString(localeEl);
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collctype = defGetString(localeEl);
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}
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if (lccollateEl)
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collcollate = defGetString(lccollateEl);
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if (lcctypeEl)
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collctype = defGetString(lcctypeEl);
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if (!collcollate)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
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errmsg("parameter \"lc_collate\" must be specified")));
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if (!collctype)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
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errmsg("parameter \"lc_ctype\" must be specified")));
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check_encoding_locale_matches(GetDatabaseEncoding(), collcollate, collctype);
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newoid = CollationCreate(collName,
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collNamespace,
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GetUserId(),
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GetDatabaseEncoding(),
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collcollate,
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collctype,
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false);
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if (!OidIsValid(newoid))
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return InvalidObjectAddress;
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ObjectAddressSet(address, CollationRelationId, newoid);
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/* check that the locales can be loaded */
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CommandCounterIncrement();
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(void) pg_newlocale_from_collation(newoid);
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return address;
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}
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/*
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* Subroutine for ALTER COLLATION SET SCHEMA and RENAME
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*
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* Is there a collation with the same name of the given collation already in
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* the given namespace? If so, raise an appropriate error message.
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*/
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void
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IsThereCollationInNamespace(const char *collname, Oid nspOid)
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{
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/* make sure the name doesn't already exist in new schema */
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if (SearchSysCacheExists3(COLLNAMEENCNSP,
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CStringGetDatum(collname),
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Int32GetDatum(GetDatabaseEncoding()),
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ObjectIdGetDatum(nspOid)))
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ereport(ERROR,
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(errcode(ERRCODE_DUPLICATE_OBJECT),
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errmsg("collation \"%s\" for encoding \"%s\" already exists in schema \"%s\"",
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collname, GetDatabaseEncodingName(),
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get_namespace_name(nspOid))));
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/* mustn't match an any-encoding entry, either */
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if (SearchSysCacheExists3(COLLNAMEENCNSP,
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CStringGetDatum(collname),
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Int32GetDatum(-1),
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ObjectIdGetDatum(nspOid)))
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ereport(ERROR,
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(errcode(ERRCODE_DUPLICATE_OBJECT),
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errmsg("collation \"%s\" already exists in schema \"%s\"",
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collname, get_namespace_name(nspOid))));
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}
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/*
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* "Normalize" a locale name, stripping off encoding tags such as
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* ".utf8" (e.g., "en_US.utf8" -> "en_US", but "br_FR.iso885915@euro"
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* -> "br_FR@euro"). Return true if a new, different name was
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* generated.
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*/
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pg_attribute_unused()
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static bool
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normalize_locale_name(char *new, const char *old)
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{
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char *n = new;
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const char *o = old;
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bool changed = false;
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while (*o)
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{
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if (*o == '.')
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{
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/* skip over encoding tag such as ".utf8" or ".UTF-8" */
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o++;
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while ((*o >= 'A' && *o <= 'Z')
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|| (*o >= 'a' && *o <= 'z')
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|| (*o >= '0' && *o <= '9')
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|| (*o == '-'))
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o++;
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changed = true;
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}
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else
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*n++ = *o++;
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}
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*n = '\0';
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return changed;
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}
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Datum
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pg_import_system_collations(PG_FUNCTION_ARGS)
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{
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#if defined(HAVE_LOCALE_T) && !defined(WIN32)
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bool if_not_exists = PG_GETARG_BOOL(0);
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Oid nspid = PG_GETARG_OID(1);
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FILE *locale_a_handle;
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char localebuf[NAMEDATALEN]; /* we assume ASCII so this is fine */
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int count = 0;
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List *aliaslist = NIL;
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List *localelist = NIL;
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List *enclist = NIL;
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ListCell *lca,
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*lcl,
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*lce;
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#endif
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if (!superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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(errmsg("must be superuser to import system collations"))));
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#if defined(HAVE_LOCALE_T) && !defined(WIN32)
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locale_a_handle = OpenPipeStream("locale -a", "r");
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if (locale_a_handle == NULL)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not execute command \"%s\": %m",
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"locale -a")));
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while (fgets(localebuf, sizeof(localebuf), locale_a_handle))
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{
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int i;
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size_t len;
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int enc;
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bool skip;
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char alias[NAMEDATALEN];
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len = strlen(localebuf);
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if (len == 0 || localebuf[len - 1] != '\n')
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{
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elog(DEBUG1, "locale name too long, skipped: \"%s\"", localebuf);
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continue;
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}
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localebuf[len - 1] = '\0';
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/*
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* Some systems have locale names that don't consist entirely of ASCII
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* letters (such as "bokmål" or "français"). This is
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* pretty silly, since we need the locale itself to interpret the
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* non-ASCII characters. We can't do much with those, so we filter
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* them out.
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*/
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skip = false;
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for (i = 0; i < len; i++)
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{
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if (IS_HIGHBIT_SET(localebuf[i]))
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{
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skip = true;
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break;
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}
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}
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if (skip)
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{
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elog(DEBUG1, "locale name has non-ASCII characters, skipped: \"%s\"", localebuf);
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continue;
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}
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enc = pg_get_encoding_from_locale(localebuf, false);
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if (enc < 0)
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{
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/* error message printed by pg_get_encoding_from_locale() */
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continue;
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}
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if (!PG_VALID_BE_ENCODING(enc))
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continue; /* ignore locales for client-only encodings */
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if (enc == PG_SQL_ASCII)
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continue; /* C/POSIX are already in the catalog */
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count++;
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CollationCreate(localebuf, nspid, GetUserId(), enc,
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localebuf, localebuf, if_not_exists);
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CommandCounterIncrement();
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/*
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* Generate aliases such as "en_US" in addition to "en_US.utf8" for
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* ease of use. Note that collation names are unique per encoding
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* only, so this doesn't clash with "en_US" for LATIN1, say.
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*
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* However, it might conflict with a name we'll see later in the
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* "locale -a" output. So save up the aliases and try to add them
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* after we've read all the output.
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*/
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if (normalize_locale_name(alias, localebuf))
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{
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aliaslist = lappend(aliaslist, pstrdup(alias));
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localelist = lappend(localelist, pstrdup(localebuf));
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enclist = lappend_int(enclist, enc);
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}
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}
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ClosePipeStream(locale_a_handle);
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/* Now try to add any aliases we created */
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forthree(lca, aliaslist, lcl, localelist, lce, enclist)
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{
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char *alias = (char *) lfirst(lca);
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char *locale = (char *) lfirst(lcl);
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int enc = lfirst_int(lce);
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CollationCreate(alias, nspid, GetUserId(), enc,
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locale, locale, true);
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CommandCounterIncrement();
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}
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if (count == 0)
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ereport(WARNING,
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(errmsg("no usable system locales were found")));
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#endif /* not HAVE_LOCALE_T && not WIN32 */
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PG_RETURN_VOID();
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}
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