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221 lines
7.4 KiB
221 lines
7.4 KiB
/*-----------------------------------------------------------------------
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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) 2002-2025, 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 "mb/pg_wchar.h"
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#ifdef USE_ICU
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/* only include the C APIs, to avoid errors in cpluspluscheck */
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#undef U_SHOW_CPLUSPLUS_API
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#define U_SHOW_CPLUSPLUS_API 0
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#include <unicode/ucol.h>
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#endif
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/* use for libc locale names */
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#define LOCALE_NAME_BUFLEN 128
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/* GUC settings */
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extern PGDLLIMPORT char *locale_messages;
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extern PGDLLIMPORT char *locale_monetary;
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extern PGDLLIMPORT char *locale_numeric;
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extern PGDLLIMPORT char *locale_time;
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extern PGDLLIMPORT int icu_validation_level;
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/* lc_time localization cache */
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extern PGDLLIMPORT char *localized_abbrev_days[];
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extern PGDLLIMPORT char *localized_full_days[];
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extern PGDLLIMPORT char *localized_abbrev_months[];
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extern PGDLLIMPORT char *localized_full_months[];
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/* is the databases's LC_CTYPE the C locale? */
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extern PGDLLIMPORT bool database_ctype_is_c;
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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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/*
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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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struct pg_locale_struct;
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typedef struct pg_locale_struct *pg_locale_t;
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/* methods that define collation behavior */
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struct collate_methods
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{
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/* required */
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int (*strncoll) (const char *arg1, ssize_t len1,
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const char *arg2, ssize_t len2,
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pg_locale_t locale);
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/* required */
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size_t (*strnxfrm) (char *dest, size_t destsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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/* optional */
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size_t (*strnxfrm_prefix) (char *dest, size_t destsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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/*
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* If the strnxfrm method is not trusted to return the correct results,
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* set strxfrm_is_safe to false. It set to false, the method will not be
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* used in most cases, but the planner still expects it to be there for
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* estimation purposes (where incorrect results are acceptable).
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*/
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bool strxfrm_is_safe;
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};
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struct ctype_methods
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{
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/* case mapping: LOWER()/INITCAP()/UPPER() */
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size_t (*strlower) (char *dest, size_t destsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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size_t (*strtitle) (char *dest, size_t destsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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size_t (*strupper) (char *dest, size_t destsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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size_t (*strfold) (char *dest, size_t destsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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/* required */
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bool (*wc_isdigit) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_isalpha) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_isalnum) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_isupper) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_islower) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_isgraph) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_isprint) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_ispunct) (pg_wchar wc, pg_locale_t locale);
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bool (*wc_isspace) (pg_wchar wc, pg_locale_t locale);
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pg_wchar (*wc_toupper) (pg_wchar wc, pg_locale_t locale);
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pg_wchar (*wc_tolower) (pg_wchar wc, pg_locale_t locale);
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/* required */
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bool (*char_is_cased) (char ch, pg_locale_t locale);
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/*
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* Optional. If defined, will only be called for single-byte encodings. If
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* not defined, or if the encoding is multibyte, will fall back to
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* pg_strlower().
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*/
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char (*char_tolower) (unsigned char ch, pg_locale_t locale);
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/*
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* For regex and pattern matching efficiency, the maximum char value
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* supported by the above methods. If zero, limit is set by regex code.
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*/
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pg_wchar max_chr;
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};
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/*
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* We use a discriminated union to hold either a locale_t or an ICU collator.
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* pg_locale_t is occasionally checked for truth, so make it a pointer.
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*
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* Also, hold two flags: whether the collation's LC_COLLATE or LC_CTYPE is C
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* (or POSIX), so we can optimize a few code paths in various places. For the
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* built-in C and POSIX collations, we can know that without even doing a
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* cache lookup, but we want to support aliases for C/POSIX too. For the
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* "default" collation, there are separate static cache variables, since
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* consulting the pg_collation catalog doesn't tell us what we need.
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*
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* Note that some code relies on the flags not reporting false negatives
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* (that is, saying it's not C when it is). For example, char2wchar()
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* could fail if the locale is C, so str_tolower() shouldn't call it
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* in that case.
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*/
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struct pg_locale_struct
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{
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bool deterministic;
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bool collate_is_c;
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bool ctype_is_c;
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bool is_default;
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const struct collate_methods *collate; /* NULL if collate_is_c */
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const struct ctype_methods *ctype; /* NULL if ctype_is_c */
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union
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{
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struct
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{
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const char *locale;
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bool casemap_full;
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} builtin;
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locale_t lt;
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#ifdef USE_ICU
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struct
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{
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const char *locale;
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UCollator *ucol;
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} icu;
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#endif
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} info;
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};
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extern void init_database_collation(void);
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extern pg_locale_t pg_newlocale_from_collation(Oid collid);
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extern char *get_collation_actual_version(char collprovider, const char *collcollate);
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extern bool char_is_cased(char ch, pg_locale_t locale);
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extern bool char_tolower_enabled(pg_locale_t locale);
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extern char char_tolower(unsigned char ch, pg_locale_t locale);
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extern size_t pg_strlower(char *dst, size_t dstsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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extern size_t pg_strtitle(char *dst, size_t dstsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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extern size_t pg_strupper(char *dst, size_t dstsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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extern size_t pg_strfold(char *dst, size_t dstsize,
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const char *src, ssize_t srclen,
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pg_locale_t locale);
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extern int pg_strcoll(const char *arg1, const char *arg2, pg_locale_t locale);
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extern int pg_strncoll(const char *arg1, ssize_t len1,
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const char *arg2, ssize_t len2, pg_locale_t locale);
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extern bool pg_strxfrm_enabled(pg_locale_t locale);
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extern size_t pg_strxfrm(char *dest, const char *src, size_t destsize,
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pg_locale_t locale);
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extern size_t pg_strnxfrm(char *dest, size_t destsize, const char *src,
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ssize_t srclen, pg_locale_t locale);
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extern bool pg_strxfrm_prefix_enabled(pg_locale_t locale);
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extern size_t pg_strxfrm_prefix(char *dest, const char *src, size_t destsize,
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pg_locale_t locale);
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extern size_t pg_strnxfrm_prefix(char *dest, size_t destsize, const char *src,
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ssize_t srclen, pg_locale_t locale);
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extern int builtin_locale_encoding(const char *locale);
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extern const char *builtin_validate_locale(int encoding, const char *locale);
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extern void icu_validate_locale(const char *loc_str);
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extern char *icu_language_tag(const char *loc_str, int elevel);
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extern void report_newlocale_failure(const char *localename);
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/* These functions convert from/to libc's wchar_t, *not* pg_wchar_t */
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extern size_t wchar2char(char *to, const wchar_t *from, size_t tolen,
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locale_t loc);
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extern size_t char2wchar(wchar_t *to, size_t tolen,
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const char *from, size_t fromlen, locale_t loc);
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#endif /* _PG_LOCALE_ */
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