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c7cea267de
setlocale() accepts locale name "" as meaning "the locale specified by the process's environment variables". Historically we've accepted that for Postgres' locale settings, too. However, it's fairly unsafe to store an empty string in a new database's pg_database.datcollate or datctype fields, because then the interpretation could vary across postmaster restarts, possibly resulting in index corruption and other unpleasantness. Instead, we should expand "" to whatever it means at the moment of calling CREATE DATABASE, which we can do by saving the value returned by setlocale(). For consistency, make initdb set up the initial lc_xxx parameter values the same way. initdb was already doing the right thing for empty locale names, but it did not replace non-empty names with setlocale results. On a platform where setlocale chooses to canonicalize the spellings of locale names, this would result in annoying inconsistency. (It seems that popular implementations of setlocale don't do such canonicalization, which is a pity, but the POSIX spec certainly allows it to be done.) The same risk of inconsistency leads me to not venture back-patching this, although it could certainly be seen as a longstanding bug. Per report from Jeff Davis, though this is not his proposed patch.
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*-----------------------------------------------------------------------
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*
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* PostgreSQL locale utilities
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*
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* src/include/utils/pg_locale.h
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*
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* Copyright (c) 2002-2012, PostgreSQL Global Development Group
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*
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*-----------------------------------------------------------------------
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*/
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#ifndef _PG_LOCALE_
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#define _PG_LOCALE_
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#include <locale.h>
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#ifdef LOCALE_T_IN_XLOCALE
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#include <xlocale.h>
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#endif
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#include "utils/guc.h"
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/* GUC settings */
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extern char *locale_messages;
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extern char *locale_monetary;
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extern char *locale_numeric;
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extern char *locale_time;
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/* lc_time localization cache */
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extern char *localized_abbrev_days[];
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extern char *localized_full_days[];
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extern char *localized_abbrev_months[];
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extern char *localized_full_months[];
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extern bool check_locale_messages(char **newval, void **extra, GucSource source);
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extern void assign_locale_messages(const char *newval, void *extra);
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extern bool check_locale_monetary(char **newval, void **extra, GucSource source);
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extern void assign_locale_monetary(const char *newval, void *extra);
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extern bool check_locale_numeric(char **newval, void **extra, GucSource source);
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extern void assign_locale_numeric(const char *newval, void *extra);
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extern bool check_locale_time(char **newval, void **extra, GucSource source);
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extern void assign_locale_time(const char *newval, void *extra);
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extern bool check_locale(int category, const char *locale, char **canonname);
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extern char *pg_perm_setlocale(int category, const char *locale);
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extern bool lc_collate_is_c(Oid collation);
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extern bool lc_ctype_is_c(Oid collation);
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/*
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* Return the POSIX lconv struct (contains number/money formatting
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* information) with locale information for all categories.
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*/
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extern struct lconv *PGLC_localeconv(void);
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extern void cache_locale_time(void);
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/*
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* We define our own wrapper around locale_t so we can keep the same
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* function signatures for all builds, while not having to create a
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* fake version of the standard type locale_t in the global namespace.
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* The fake version of pg_locale_t can be checked for truth; that's
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* about all it will be needed for.
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*/
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#ifdef HAVE_LOCALE_T
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typedef locale_t pg_locale_t;
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#else
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typedef int pg_locale_t;
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#endif
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extern pg_locale_t pg_newlocale_from_collation(Oid collid);
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/* These functions convert from/to libc's wchar_t, *not* pg_wchar_t */
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#ifdef USE_WIDE_UPPER_LOWER
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extern size_t wchar2char(char *to, const wchar_t *from, size_t tolen,
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pg_locale_t locale);
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extern size_t char2wchar(wchar_t *to, size_t tolen,
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const char *from, size_t fromlen, pg_locale_t locale);
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#endif
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#endif /* _PG_LOCALE_ */
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