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Edit File: pg_locale.h

/*-----------------------------------------------------------------------
 *
 * PostgreSQL locale utilities
 *
 * src/include/utils/pg_locale.h
 *
 * Copyright (c) 2002-2012, PostgreSQL Global Development Group
 *
 *-----------------------------------------------------------------------
 */

#ifndef _PG_LOCALE_
#define _PG_LOCALE_

#include <locale.h>
#if defined(LOCALE_T_IN_XLOCALE) || defined(WCSTOMBS_L_IN_XLOCALE)
#include <xlocale.h>
#endif

#include "utils/guc.h"

/* GUC settings */
extern char *locale_messages;
extern char *locale_monetary;
extern char *locale_numeric;
extern char *locale_time;

/* lc_time localization cache */
extern char *localized_abbrev_days[];
extern char *localized_full_days[];
extern char *localized_abbrev_months[];
extern char *localized_full_months[];

extern bool check_locale_messages(char **newval, void **extra, GucSource source);
extern void assign_locale_messages(const char *newval, void *extra);
extern bool check_locale_monetary(char **newval, void **extra, GucSource source);
extern void assign_locale_monetary(const char *newval, void *extra);
extern bool check_locale_numeric(char **newval, void **extra, GucSource source);
extern void assign_locale_numeric(const char *newval, void *extra);
extern bool check_locale_time(char **newval, void **extra, GucSource source);
extern void assign_locale_time(const char *newval, void *extra);

extern bool check_locale(int category, const char *locale, char **canonname);
extern char *pg_perm_setlocale(int category, const char *locale);

extern bool lc_collate_is_c(Oid collation);
extern bool lc_ctype_is_c(Oid collation);

/*
 * Return the POSIX lconv struct (contains number/money formatting
 * information) with locale information for all categories.
 */
extern struct lconv *PGLC_localeconv(void);

extern void cache_locale_time(void);

/*
 * We define our own wrapper around locale_t so we can keep the same
 * function signatures for all builds, while not having to create a
 * fake version of the standard type locale_t in the global namespace.
 * The fake version of pg_locale_t can be checked for truth; that's
 * about all it will be needed for.
 */
#ifdef HAVE_LOCALE_T
typedef locale_t pg_locale_t;
#else
typedef int pg_locale_t;
#endif

extern pg_locale_t pg_newlocale_from_collation(Oid collid);

/* These functions convert from/to libc's wchar_t, *not* pg_wchar_t */
#ifdef USE_WIDE_UPPER_LOWER
extern size_t wchar2char(char *to, const wchar_t *from, size_t tolen,
		   pg_locale_t locale);
extern size_t char2wchar(wchar_t *to, size_t tolen,
		   const char *from, size_t fromlen, pg_locale_t locale);
#endif

#endif   /* _PG_LOCALE_ */