pg_locale.h File Reference

#include "utils/guc.h"

Include dependency graph for pg_locale.h:

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Data Structures
struct	pg_locale_struct

Typedefs
typedef struct pg_locale_struct *	pg_locale_t

Functions
bool	check_locale_messages (char **newval, void **extra, GucSource source)
void	assign_locale_messages (const char *newval, void *extra)
bool	check_locale_monetary (char **newval, void **extra, GucSource source)
void	assign_locale_monetary (const char *newval, void *extra)
bool	check_locale_numeric (char **newval, void **extra, GucSource source)
void	assign_locale_numeric (const char *newval, void *extra)
bool	check_locale_time (char **newval, void **extra, GucSource source)
void	assign_locale_time (const char *newval, void *extra)
bool	check_locale (int category, const char *locale, char **canonname)
char *	pg_perm_setlocale (int category, const char *locale)
void	check_strxfrm_bug (void)
bool	lc_collate_is_c (Oid collation)
bool	lc_ctype_is_c (Oid collation)
struct lconv *	PGLC_localeconv (void)
void	cache_locale_time (void)
pg_locale_t	pg_newlocale_from_collation (Oid collid)
char *	get_collation_actual_version (char collprovider, const char *collcollate)
size_t	wchar2char (char *to, const wchar_t *from, size_t tolen, pg_locale_t locale)
size_t	char2wchar (wchar_t *to, size_t tolen, const char *from, size_t fromlen, pg_locale_t locale)

Variables
char *	locale_messages
char *	locale_monetary
char *	locale_numeric
char *	locale_time
char *	localized_abbrev_days []
char *	localized_full_days []
char *	localized_abbrev_months []
char *	localized_full_months []

Typedef Documentation

pg_locale_t

typedef struct pg_locale_struct* pg_locale_t

Definition at line 102 of file pg_locale.h.

Function Documentation

assign_locale_messages()

void assign_locale_messages	(	const char *	newval,
		void *	extra
	)

Definition at line 381 of file pg_locale.c.

References pg_perm_setlocale().

{
    /*
     * LC_MESSAGES category does not exist everywhere, but accept it anyway.
     * We ignore failure, as per comment above.
     */
#ifdef LC_MESSAGES
    (void) pg_perm_setlocale(LC_MESSAGES, newval);
#endif
}

assign_locale_monetary()

void assign_locale_monetary	(	const char *	newval,
		void *	extra
	)

Definition at line 318 of file pg_locale.c.

References CurrentLocaleConvValid.

{
    CurrentLocaleConvValid = false;
}

assign_locale_numeric()

void assign_locale_numeric	(	const char *	newval,
		void *	extra
	)

Definition at line 330 of file pg_locale.c.

References CurrentLocaleConvValid.

{
    CurrentLocaleConvValid = false;
}

assign_locale_time()

void assign_locale_time	(	const char *	newval,
		void *	extra
	)

Definition at line 342 of file pg_locale.c.

References CurrentLCTimeValid.

{
    CurrentLCTimeValid = false;
}

cache_locale_time()

void cache_locale_time

(

void

)

Definition at line 770 of file pg_locale.c.

References buf, cache_single_string(), CurrentLCTimeValid, DEBUG3, elog, encoding, ERROR, FATAL, i, locale_time, localized_abbrev_days, localized_abbrev_months, localized_full_days, localized_full_months, MAX_L10N_DATA, pfree(), pg_get_encoding_from_locale(), PG_SQL_ASCII, pg_strcasecmp(), PG_UTF8, pstrdup(), setlocale, snprintf, tm, and wchar2char().

Referenced by DCH_to_char().

{
    char        buf[(2 * 7 + 2 * 12) * MAX_L10N_DATA];
    char       *bufptr;
    time_t      timenow;
    struct tm  *timeinfo;
    bool        strftimefail = false;
    int         encoding;
    int         i;
    char       *save_lc_time;
#ifdef WIN32
    char       *save_lc_ctype;
#endif

    /* did we do this already? */
    if (CurrentLCTimeValid)
        return;

    elog(DEBUG3, "cache_locale_time() executed; locale: \"%s\"", locale_time);

    /*
     * As in PGLC_localeconv(), it's critical that we not throw error while
     * libc's locale settings have nondefault values.  Hence, we just call
     * strftime() within the critical section, and then convert and save its
     * results afterwards.
     */

    /* Save prevailing value of time locale */
    save_lc_time = setlocale(LC_TIME, NULL);
    if (!save_lc_time)
        elog(ERROR, "setlocale(NULL) failed");
    save_lc_time = pstrdup(save_lc_time);

#ifdef WIN32

    /*
     * On Windows, it appears that wcsftime() internally uses LC_CTYPE, so we
     * must set it here.  This code looks the same as what PGLC_localeconv()
     * does, but the underlying reason is different: this does NOT determine
     * the encoding we'll get back from strftime_win32().
     */

    /* Save prevailing value of ctype locale */
    save_lc_ctype = setlocale(LC_CTYPE, NULL);
    if (!save_lc_ctype)
        elog(ERROR, "setlocale(NULL) failed");
    save_lc_ctype = pstrdup(save_lc_ctype);

    /* use lc_time to set the ctype */
    setlocale(LC_CTYPE, locale_time);
#endif

    setlocale(LC_TIME, locale_time);

    /* We use times close to current time as data for strftime(). */
    timenow = time(NULL);
    timeinfo = localtime(&timenow);

    /* Store the strftime results in MAX_L10N_DATA-sized portions of buf[] */
    bufptr = buf;

    /*
     * MAX_L10N_DATA is sufficient buffer space for every known locale, and
     * POSIX defines no strftime() errors.  (Buffer space exhaustion is not an
     * error.)  An implementation might report errors (e.g. ENOMEM) by
     * returning 0 (or, less plausibly, a negative value) and setting errno.
     * Report errno just in case the implementation did that, but clear it in
     * advance of the calls so we don't emit a stale, unrelated errno.
     */
    errno = 0;

    /* localized days */
    for (i = 0; i < 7; i++)
    {
        timeinfo->tm_wday = i;
        if (strftime(bufptr, MAX_L10N_DATA, "%a", timeinfo) <= 0)
            strftimefail = true;
        bufptr += MAX_L10N_DATA;
        if (strftime(bufptr, MAX_L10N_DATA, "%A", timeinfo) <= 0)
            strftimefail = true;
        bufptr += MAX_L10N_DATA;
    }

    /* localized months */
    for (i = 0; i < 12; i++)
    {
        timeinfo->tm_mon = i;
        timeinfo->tm_mday = 1;  /* make sure we don't have invalid date */
        if (strftime(bufptr, MAX_L10N_DATA, "%b", timeinfo) <= 0)
            strftimefail = true;
        bufptr += MAX_L10N_DATA;
        if (strftime(bufptr, MAX_L10N_DATA, "%B", timeinfo) <= 0)
            strftimefail = true;
        bufptr += MAX_L10N_DATA;
    }

    /*
     * Restore the prevailing locale settings; as in PGLC_localeconv(),
     * failure to do so is fatal.
     */
#ifdef WIN32
    if (!setlocale(LC_CTYPE, save_lc_ctype))
        elog(FATAL, "failed to restore LC_CTYPE to \"%s\"", save_lc_ctype);
#endif
    if (!setlocale(LC_TIME, save_lc_time))
        elog(FATAL, "failed to restore LC_TIME to \"%s\"", save_lc_time);

    /*
     * At this point we've done our best to clean up, and can throw errors, or
     * call functions that might throw errors, with a clean conscience.
     */
    if (strftimefail)
        elog(ERROR, "strftime() failed: %m");

    /* Release the pstrdup'd locale names */
    pfree(save_lc_time);
#ifdef WIN32
    pfree(save_lc_ctype);
#endif

#ifndef WIN32

    /*
     * As in PGLC_localeconv(), we must convert strftime()'s output from the
     * encoding implied by LC_TIME to the database encoding.  If we can't
     * identify the LC_TIME encoding, just perform encoding validation.
     */
    encoding = pg_get_encoding_from_locale(locale_time, true);
    if (encoding < 0)
        encoding = PG_SQL_ASCII;

#else

    /*
     * On Windows, strftime_win32() always returns UTF8 data, so convert from
     * that if necessary.
     */
    encoding = PG_UTF8;

#endif                          /* WIN32 */

    bufptr = buf;

    /* localized days */
    for (i = 0; i < 7; i++)
    {
        cache_single_string(&localized_abbrev_days[i], bufptr, encoding);
        bufptr += MAX_L10N_DATA;
        cache_single_string(&localized_full_days[i], bufptr, encoding);
        bufptr += MAX_L10N_DATA;
    }

    /* localized months */
    for (i = 0; i < 12; i++)
    {
        cache_single_string(&localized_abbrev_months[i], bufptr, encoding);
        bufptr += MAX_L10N_DATA;
        cache_single_string(&localized_full_months[i], bufptr, encoding);
        bufptr += MAX_L10N_DATA;
    }

    CurrentLCTimeValid = true;
}

char2wchar()

size_t char2wchar	(	wchar_t *	to,
		size_t	tolen,
		const char *	from,
		size_t	fromlen,
		pg_locale_t	locale
	)

Definition at line 1845 of file pg_locale.c.

References Assert, elog, ereport, errcode(), errhint(), errmsg(), ERROR, GetDatabaseEncoding(), pg_locale_struct::info, locale_t, mbstowcs_l, pfree(), PG_UTF8, pg_verifymbstr(), pnstrdup(), pg_locale_struct::provider, and generate_unaccent_rules::str.

Referenced by lowerstr_with_len(), str_initcap(), str_tolower(), str_toupper(), t_isalpha(), t_isdigit(), t_isprint(), t_isspace(), and TParserInit().

{
    size_t      result;

    Assert(!locale || locale->provider == COLLPROVIDER_LIBC);

    if (tolen == 0)
        return 0;

#ifdef WIN32
    /* See WIN32 "Unicode" comment above */
    if (GetDatabaseEncoding() == PG_UTF8)
    {
        /* Win32 API does not work for zero-length input */
        if (fromlen == 0)
            result = 0;
        else
        {
            result = MultiByteToWideChar(CP_UTF8, 0, from, fromlen, to, tolen - 1);
            /* A zero return is failure */
            if (result == 0)
                result = -1;
        }

        if (result != -1)
        {
            Assert(result < tolen);
            /* Append trailing null wchar (MultiByteToWideChar() does not) */
            to[result] = 0;
        }
    }
    else
#endif                          /* WIN32 */
    {
        /* mbstowcs requires ending '\0' */
        char       *str = pnstrdup(from, fromlen);

        if (locale == (pg_locale_t) 0)
        {
            /* Use mbstowcs directly for the default locale */
            result = mbstowcs(to, str, tolen);
        }
        else
        {
#ifdef HAVE_LOCALE_T
#ifdef HAVE_MBSTOWCS_L
            /* Use mbstowcs_l for nondefault locales */
            result = mbstowcs_l(to, str, tolen, locale->info.lt);
#else                           /* !HAVE_MBSTOWCS_L */
            /* We have to temporarily set the locale as current ... ugh */
            locale_t    save_locale = uselocale(locale->info.lt);

            result = mbstowcs(to, str, tolen);

            uselocale(save_locale);
#endif                          /* HAVE_MBSTOWCS_L */
#else                           /* !HAVE_LOCALE_T */
            /* Can't have locale != 0 without HAVE_LOCALE_T */
            elog(ERROR, "mbstowcs_l is not available");
            result = 0;         /* keep compiler quiet */
#endif                          /* HAVE_LOCALE_T */
        }

        pfree(str);
    }

    if (result == -1)
    {
        /*
         * Invalid multibyte character encountered.  We try to give a useful
         * error message by letting pg_verifymbstr check the string.  But it's
         * possible that the string is OK to us, and not OK to mbstowcs ---
         * this suggests that the LC_CTYPE locale is different from the
         * database encoding.  Give a generic error message if pg_verifymbstr
         * can't find anything wrong.
         */
        pg_verifymbstr(from, fromlen, false);   /* might not return */
        /* but if it does ... */
        ereport(ERROR,
                (errcode(ERRCODE_CHARACTER_NOT_IN_REPERTOIRE),
                 errmsg("invalid multibyte character for locale"),
                 errhint("The server's LC_CTYPE locale is probably incompatible with the database encoding.")));
    }

    return result;
}

check_locale()

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

Definition at line 269 of file pg_locale.c.

References elog, pfree(), pstrdup(), setlocale, and WARNING.

Referenced by check_locale_messages(), check_locale_monetary(), check_locale_numeric(), check_locale_time(), and createdb().

{
    char       *save;
    char       *res;

    if (canonname)
        *canonname = NULL;      /* in case of failure */

    save = setlocale(category, NULL);
    if (!save)
        return false;           /* won't happen, we hope */

    /* save may be pointing at a modifiable scratch variable, see above. */
    save = pstrdup(save);

    /* set the locale with setlocale, to see if it accepts it. */
    res = setlocale(category, locale);

    /* save canonical name if requested. */
    if (res && canonname)
        *canonname = pstrdup(res);

    /* restore old value. */
    if (!setlocale(category, save))
        elog(WARNING, "failed to restore old locale \"%s\"", save);
    pfree(save);

    return (res != NULL);
}

check_locale_messages()

bool check_locale_messages	(	char **	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 358 of file pg_locale.c.

References check_locale(), and PGC_S_DEFAULT.

{
    if (**newval == '\0')
    {
        if (source == PGC_S_DEFAULT)
            return true;
        else
            return false;
    }

    /*
     * LC_MESSAGES category does not exist everywhere, but accept it anyway
     *
     * On Windows, we can't even check the value, so accept blindly
     */
#if defined(LC_MESSAGES) && !defined(WIN32)
    return check_locale(LC_MESSAGES, *newval, NULL);
#else
    return true;
#endif
}

check_locale_monetary()

bool check_locale_monetary	(	char **	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 312 of file pg_locale.c.

References check_locale().

{
    return check_locale(LC_MONETARY, *newval, NULL);
}

check_locale_numeric()

bool check_locale_numeric	(	char **	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 324 of file pg_locale.c.

References check_locale().

{
    return check_locale(LC_NUMERIC, *newval, NULL);
}

check_locale_time()

bool check_locale_time	(	char **	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 336 of file pg_locale.c.

References check_locale().

{
    return check_locale(LC_TIME, *newval, NULL);
}

check_strxfrm_bug()

void check_strxfrm_bug

(

void

)

Definition at line 1056 of file pg_locale.c.

References buf, ereport, errcode(), errhint(), errmsg_internal(), ERROR, and setlocale.

Referenced by CheckMyDatabase(), and main().

{
    char        buf[32];
    const int   canary = 0x7F;
    bool        ok = true;

    /*
     * Given a two-byte ASCII string and length limit 7, 8 or 9, Solaris 10
     * 05/08 returns 18 and modifies 10 bytes.  It respects limits above or
     * below that range.
     *
     * The bug is present in Solaris 8 as well; it is absent in Solaris 10
     * 01/13 and Solaris 11.2.  Affected locales include is_IS.ISO8859-1,
     * en_US.UTF-8, en_US.ISO8859-1, and ru_RU.KOI8-R.  Unaffected locales
     * include de_DE.UTF-8, de_DE.ISO8859-1, zh_TW.UTF-8, and C.
     */
    buf[7] = canary;
    (void) strxfrm(buf, "ab", 7);
    if (buf[7] != canary)
        ok = false;

    /*
     * illumos bug #1594 was present in the source tree from 2010-10-11 to
     * 2012-02-01.  Given an ASCII string of any length and length limit 1,
     * affected systems ignore the length limit and modify a number of bytes
     * one less than the return value.  The problem inputs for this bug do not
     * overlap those for the Solaris bug, hence a distinct test.
     *
     * Affected systems include smartos-20110926T021612Z.  Affected locales
     * include en_US.ISO8859-1 and en_US.UTF-8.  Unaffected locales include C.
     */
    buf[1] = canary;
    (void) strxfrm(buf, "a", 1);
    if (buf[1] != canary)
        ok = false;

    if (!ok)
        ereport(ERROR,
                (errcode(ERRCODE_SYSTEM_ERROR),
                 errmsg_internal("strxfrm(), in locale \"%s\", writes past the specified array length",
                                 setlocale(LC_COLLATE, NULL)),
                 errhint("Apply system library package updates.")));
}

get_collation_actual_version()

char* get_collation_actual_version	(	char	collprovider,
		const char *	collcollate
	)

Definition at line 1519 of file pg_locale.c.

References asc_tolower(), buf, ereport, errmsg(), ERROR, get_encoding_name_for_icu(), GetDatabaseEncoding(), name, palloc(), pg_attribute_unused(), pstrdup(), status(), generate_unaccent_rules::str, and value.

Referenced by AlterCollation(), DefineCollation(), pg_collation_actual_version(), pg_import_system_collations(), and pg_newlocale_from_collation().

{
    char       *collversion;

#ifdef USE_ICU
    if (collprovider == COLLPROVIDER_ICU)
    {
        UCollator  *collator;
        UErrorCode  status;
        UVersionInfo versioninfo;
        char        buf[U_MAX_VERSION_STRING_LENGTH];

        status = U_ZERO_ERROR;
        collator = ucol_open(collcollate, &status);
        if (U_FAILURE(status))
            ereport(ERROR,
                    (errmsg("could not open collator for locale \"%s\": %s",
                            collcollate, u_errorName(status))));
        ucol_getVersion(collator, versioninfo);
        ucol_close(collator);

        u_versionToString(versioninfo, buf);
        collversion = pstrdup(buf);
    }
    else
#endif
        collversion = NULL;

    return collversion;
}

lc_collate_is_c()

bool lc_collate_is_c

(

Oid

collation

)

Definition at line 1191 of file pg_locale.c.

References elog, ERROR, lookup_collation_cache(), OidIsValid, and setlocale.

Referenced by bpchareq(), bpcharne(), convert_string_datum(), DefineCollation(), hashbpchar(), hashbpcharextended(), hashtext(), hashtextextended(), make_greater_string(), match_pattern_prefix(), spg_text_inner_consistent(), text_position_setup(), text_starts_with(), texteq(), textne(), varstr_cmp(), and varstr_sortsupport().

{
    /*
     * If we're asked about "collation 0", return false, so that the code will
     * go into the non-C path and report that the collation is bogus.
     */
    if (!OidIsValid(collation))
        return false;

    /*
     * If we're asked about the default collation, we have to inquire of the C
     * library.  Cache the result so we only have to compute it once.
     */
    if (collation == DEFAULT_COLLATION_OID)
    {
        static int  result = -1;
        char       *localeptr;

        if (result >= 0)
            return (bool) result;
        localeptr = setlocale(LC_COLLATE, NULL);
        if (!localeptr)
            elog(ERROR, "invalid LC_COLLATE setting");

        if (strcmp(localeptr, "C") == 0)
            result = true;
        else if (strcmp(localeptr, "POSIX") == 0)
            result = true;
        else
            result = false;
        return (bool) result;
    }

    /*
     * If we're asked about the built-in C/POSIX collations, we know that.
     */
    if (collation == C_COLLATION_OID ||
        collation == POSIX_COLLATION_OID)
        return true;

    /*
     * Otherwise, we have to consult pg_collation, but we cache that.
     */
    return (lookup_collation_cache(collation, true))->collate_is_c;
}

lc_ctype_is_c()

bool lc_ctype_is_c

(

Oid

collation

)

Definition at line 1241 of file pg_locale.c.

References elog, ereport, errcode(), errdetail(), errmsg(), ERROR, lookup_collation_cache(), OidIsValid, and setlocale.

Referenced by DefineCollation(), Generic_Text_IC_like(), GenericMatchText(), like_fixed_prefix(), lowerstr_with_len(), pg_set_regex_collation(), str_initcap(), str_tolower(), str_toupper(), t_isalpha(), t_isdigit(), t_isprint(), t_isspace(), and TParserInit().

{
    /*
     * If we're asked about "collation 0", return false, so that the code will
     * go into the non-C path and report that the collation is bogus.
     */
    if (!OidIsValid(collation))
        return false;

    /*
     * If we're asked about the default collation, we have to inquire of the C
     * library.  Cache the result so we only have to compute it once.
     */
    if (collation == DEFAULT_COLLATION_OID)
    {
        static int  result = -1;
        char       *localeptr;

        if (result >= 0)
            return (bool) result;
        localeptr = setlocale(LC_CTYPE, NULL);
        if (!localeptr)
            elog(ERROR, "invalid LC_CTYPE setting");

        if (strcmp(localeptr, "C") == 0)
            result = true;
        else if (strcmp(localeptr, "POSIX") == 0)
            result = true;
        else
            result = false;
        return (bool) result;
    }

    /*
     * If we're asked about the built-in C/POSIX collations, we know that.
     */
    if (collation == C_COLLATION_OID ||
        collation == POSIX_COLLATION_OID)
        return true;

    /*
     * Otherwise, we have to consult pg_collation, but we cache that.
     */
    return (lookup_collation_cache(collation, true))->ctype_is_c;
}

pg_newlocale_from_collation()

pg_locale_t pg_newlocale_from_collation

(

Oid

collid

)

Definition at line 1338 of file pg_locale.c.

References Assert, COLLOID, pg_locale_struct::deterministic, elog, ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, get_collation_actual_version(), get_namespace_name(), GETSTRUCT, HeapTupleIsValid, pg_locale_struct::info, collation_cache_entry::locale, locale_t, lookup_collation_cache(), MemoryContextAlloc(), MemoryContextStrdup(), NameStr, ObjectIdGetDatum, OidIsValid, pg_attribute_unused(), pg_locale_struct::provider, quote_qualified_identifier(), ReleaseSysCache(), SearchSysCache1(), status(), SysCacheGetAttr(), TextDatumGetCString, TopMemoryContext, and WARNING.

Referenced by bpchareq(), bpcharne(), DefineCollation(), Generic_Text_IC_like(), GenericMatchText(), hashbpchar(), hashbpcharextended(), hashtext(), hashtextextended(), like_fixed_prefix(), pg_set_regex_collation(), str_initcap(), str_tolower(), str_toupper(), text_position_setup(), text_starts_with(), texteq(), textne(), varstr_cmp(), and varstr_sortsupport().

{
    collation_cache_entry *cache_entry;

    /* Callers must pass a valid OID */
    Assert(OidIsValid(collid));

    /* Return 0 for "default" collation, just in case caller forgets */
    if (collid == DEFAULT_COLLATION_OID)
        return (pg_locale_t) 0;

    cache_entry = lookup_collation_cache(collid, false);

    if (cache_entry->locale == 0)
    {
        /* We haven't computed this yet in this session, so do it */
        HeapTuple   tp;
        Form_pg_collation collform;
        const char *collcollate;
        const char *collctype pg_attribute_unused();
        struct pg_locale_struct result;
        pg_locale_t resultp;
        Datum       collversion;
        bool        isnull;

        tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
        if (!HeapTupleIsValid(tp))
            elog(ERROR, "cache lookup failed for collation %u", collid);
        collform = (Form_pg_collation) GETSTRUCT(tp);

        collcollate = NameStr(collform->collcollate);
        collctype = NameStr(collform->collctype);

        /* We'll fill in the result struct locally before allocating memory */
        memset(&result, 0, sizeof(result));
        result.provider = collform->collprovider;
        result.deterministic = collform->collisdeterministic;

        if (collform->collprovider == COLLPROVIDER_LIBC)
        {
#ifdef HAVE_LOCALE_T
            locale_t    loc;

            if (strcmp(collcollate, collctype) == 0)
            {
                /* Normal case where they're the same */
                errno = 0;
#ifndef WIN32
                loc = newlocale(LC_COLLATE_MASK | LC_CTYPE_MASK, collcollate,
                                NULL);
#else
                loc = _create_locale(LC_ALL, collcollate);
#endif
                if (!loc)
                    report_newlocale_failure(collcollate);
            }
            else
            {
#ifndef WIN32
                /* We need two newlocale() steps */
                locale_t    loc1;

                errno = 0;
                loc1 = newlocale(LC_COLLATE_MASK, collcollate, NULL);
                if (!loc1)
                    report_newlocale_failure(collcollate);
                errno = 0;
                loc = newlocale(LC_CTYPE_MASK, collctype, loc1);
                if (!loc)
                    report_newlocale_failure(collctype);
#else

                /*
                 * XXX The _create_locale() API doesn't appear to support
                 * this. Could perhaps be worked around by changing
                 * pg_locale_t to contain two separate fields.
                 */
                ereport(ERROR,
                        (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                         errmsg("collations with different collate and ctype values are not supported on this platform")));
#endif
            }

            result.info.lt = loc;
#else                           /* not HAVE_LOCALE_T */
            /* platform that doesn't support locale_t */
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("collation provider LIBC is not supported on this platform")));
#endif                          /* not HAVE_LOCALE_T */
        }
        else if (collform->collprovider == COLLPROVIDER_ICU)
        {
#ifdef USE_ICU
            UCollator  *collator;
            UErrorCode  status;

            if (strcmp(collcollate, collctype) != 0)
                ereport(ERROR,
                        (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                         errmsg("collations with different collate and ctype values are not supported by ICU")));

            status = U_ZERO_ERROR;
            collator = ucol_open(collcollate, &status);
            if (U_FAILURE(status))
                ereport(ERROR,
                        (errmsg("could not open collator for locale \"%s\": %s",
                                collcollate, u_errorName(status))));

            if (U_ICU_VERSION_MAJOR_NUM < 54)
                icu_set_collation_attributes(collator, collcollate);

            /* We will leak this string if we get an error below :-( */
            result.info.icu.locale = MemoryContextStrdup(TopMemoryContext,
                                                         collcollate);
            result.info.icu.ucol = collator;
#else                           /* not USE_ICU */
            /* could get here if a collation was created by a build with ICU */
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("ICU is not supported in this build"), \
                     errhint("You need to rebuild PostgreSQL using --with-icu.")));
#endif                          /* not USE_ICU */
        }

        collversion = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collversion,
                                      &isnull);
        if (!isnull)
        {
            char       *actual_versionstr;
            char       *collversionstr;

            actual_versionstr = get_collation_actual_version(collform->collprovider, collcollate);
            if (!actual_versionstr)
            {
                /*
                 * This could happen when specifying a version in CREATE
                 * COLLATION for a libc locale, or manually creating a mess in
                 * the catalogs.
                 */
                ereport(ERROR,
                        (errmsg("collation \"%s\" has no actual version, but a version was specified",
                                NameStr(collform->collname))));
            }
            collversionstr = TextDatumGetCString(collversion);

            if (strcmp(actual_versionstr, collversionstr) != 0)
                ereport(WARNING,
                        (errmsg("collation \"%s\" has version mismatch",
                                NameStr(collform->collname)),
                         errdetail("The collation in the database was created using version %s, "
                                   "but the operating system provides version %s.",
                                   collversionstr, actual_versionstr),
                         errhint("Rebuild all objects affected by this collation and run "
                                 "ALTER COLLATION %s REFRESH VERSION, "
                                 "or build PostgreSQL with the right library version.",
                                 quote_qualified_identifier(get_namespace_name(collform->collnamespace),
                                                            NameStr(collform->collname)))));
        }

        ReleaseSysCache(tp);

        /* We'll keep the pg_locale_t structures in TopMemoryContext */
        resultp = MemoryContextAlloc(TopMemoryContext, sizeof(*resultp));
        *resultp = result;

        cache_entry->locale = resultp;
    }

    return cache_entry->locale;
}

pg_perm_setlocale()

char* pg_perm_setlocale	(	int	category,
		const char *	locale
	)

Definition at line 156 of file pg_locale.c.

References elog, FATAL, GetDatabaseEncoding(), lc_collate_envbuf, lc_ctype_envbuf, LC_ENV_BUFSIZE, lc_monetary_envbuf, lc_numeric_envbuf, lc_time_envbuf, putenv, setlocale, SetMessageEncoding(), snprintf, and strlcpy().

Referenced by assign_locale_messages(), CheckMyDatabase(), and init_locale().

{
    char       *result;
    const char *envvar;
    char       *envbuf;

#ifndef WIN32
    result = setlocale(category, locale);
#else

    /*
     * On Windows, setlocale(LC_MESSAGES) does not work, so just assume that
     * the given value is good and set it in the environment variables. We
     * must ignore attempts to set to "", which means "keep using the old
     * environment value".
     */
#ifdef LC_MESSAGES
    if (category == LC_MESSAGES)
    {
        result = (char *) locale;
        if (locale == NULL || locale[0] == '\0')
            return result;
    }
    else
#endif
        result = setlocale(category, locale);
#endif                          /* WIN32 */

    if (result == NULL)
        return result;          /* fall out immediately on failure */

    /*
     * Use the right encoding in translated messages.  Under ENABLE_NLS, let
     * pg_bind_textdomain_codeset() figure it out.  Under !ENABLE_NLS, message
     * format strings are ASCII, but database-encoding strings may enter the
     * message via %s.  This makes the overall message encoding equal to the
     * database encoding.
     */
    if (category == LC_CTYPE)
    {
        static char save_lc_ctype[LC_ENV_BUFSIZE];

        /* copy setlocale() return value before callee invokes it again */
        strlcpy(save_lc_ctype, result, sizeof(save_lc_ctype));
        result = save_lc_ctype;

#ifdef ENABLE_NLS
        SetMessageEncoding(pg_bind_textdomain_codeset(textdomain(NULL)));
#else
        SetMessageEncoding(GetDatabaseEncoding());
#endif
    }

    switch (category)
    {
        case LC_COLLATE:
            envvar = "LC_COLLATE";
            envbuf = lc_collate_envbuf;
            break;
        case LC_CTYPE:
            envvar = "LC_CTYPE";
            envbuf = lc_ctype_envbuf;
            break;
#ifdef LC_MESSAGES
        case LC_MESSAGES:
            envvar = "LC_MESSAGES";
            envbuf = lc_messages_envbuf;
#ifdef WIN32
            result = IsoLocaleName(locale);
            if (result == NULL)
                result = (char *) locale;
#endif                          /* WIN32 */
            break;
#endif                          /* LC_MESSAGES */
        case LC_MONETARY:
            envvar = "LC_MONETARY";
            envbuf = lc_monetary_envbuf;
            break;
        case LC_NUMERIC:
            envvar = "LC_NUMERIC";
            envbuf = lc_numeric_envbuf;
            break;
        case LC_TIME:
            envvar = "LC_TIME";
            envbuf = lc_time_envbuf;
            break;
        default:
            elog(FATAL, "unrecognized LC category: %d", category);
            envvar = NULL;      /* keep compiler quiet */
            envbuf = NULL;
            return NULL;
    }

    snprintf(envbuf, LC_ENV_BUFSIZE - 1, "%s=%s", envvar, result);

    if (putenv(envbuf))
        return NULL;

    return result;
}

PGLC_localeconv()

struct lconv* PGLC_localeconv

(

void

)

Definition at line 488 of file pg_locale.c.

References CurrentLocaleConvValid, db_encoding_convert(), elog, encoding, ereport, errcode(), errmsg(), ERROR, FATAL, format, free_struct_lconv(), lengthof, locale_monetary, locale_numeric, MAX_L10N_DATA, pfree(), PG_CATCH, PG_END_TRY, pg_get_encoding_from_locale(), PG_RE_THROW, PG_SQL_ASCII, PG_TRY, pstrdup(), setlocale, struct_lconv_is_valid(), and tm.

Referenced by cash_in(), cash_numeric(), cash_out(), int4_cash(), int8_cash(), NUM_prepare_locale(), and numeric_cash().

{
    static struct lconv CurrentLocaleConv;
    static bool CurrentLocaleConvAllocated = false;
    struct lconv *extlconv;
    struct lconv worklconv;
    char       *save_lc_monetary;
    char       *save_lc_numeric;
#ifdef WIN32
    char       *save_lc_ctype;
#endif

    /* Did we do it already? */
    if (CurrentLocaleConvValid)
        return &CurrentLocaleConv;

    /* Free any already-allocated storage */
    if (CurrentLocaleConvAllocated)
    {
        free_struct_lconv(&CurrentLocaleConv);
        CurrentLocaleConvAllocated = false;
    }

    /*
     * This is tricky because we really don't want to risk throwing error
     * while the locale is set to other than our usual settings.  Therefore,
     * the process is: collect the usual settings, set locale to special
     * setting, copy relevant data into worklconv using strdup(), restore
     * normal settings, convert data to desired encoding, and finally stash
     * the collected data in CurrentLocaleConv.  This makes it safe if we
     * throw an error during encoding conversion or run out of memory anywhere
     * in the process.  All data pointed to by struct lconv members is
     * allocated with strdup, to avoid premature elog(ERROR) and to allow
     * using a single cleanup routine.
     */
    memset(&worklconv, 0, sizeof(worklconv));

    /* Save prevailing values of monetary and numeric locales */
    save_lc_monetary = setlocale(LC_MONETARY, NULL);
    if (!save_lc_monetary)
        elog(ERROR, "setlocale(NULL) failed");
    save_lc_monetary = pstrdup(save_lc_monetary);

    save_lc_numeric = setlocale(LC_NUMERIC, NULL);
    if (!save_lc_numeric)
        elog(ERROR, "setlocale(NULL) failed");
    save_lc_numeric = pstrdup(save_lc_numeric);

#ifdef WIN32

    /*
     * The POSIX standard explicitly says that it is undefined what happens if
     * LC_MONETARY or LC_NUMERIC imply an encoding (codeset) different from
     * that implied by LC_CTYPE.  In practice, all Unix-ish platforms seem to
     * believe that localeconv() should return strings that are encoded in the
     * codeset implied by the LC_MONETARY or LC_NUMERIC locale name.  Hence,
     * once we have successfully collected the localeconv() results, we will
     * convert them from that codeset to the desired server encoding.
     *
     * Windows, of course, resolutely does things its own way; on that
     * platform LC_CTYPE has to match LC_MONETARY/LC_NUMERIC to get sane
     * results.  Hence, we must temporarily set that category as well.
     */

    /* Save prevailing value of ctype locale */
    save_lc_ctype = setlocale(LC_CTYPE, NULL);
    if (!save_lc_ctype)
        elog(ERROR, "setlocale(NULL) failed");
    save_lc_ctype = pstrdup(save_lc_ctype);

    /* Here begins the critical section where we must not throw error */

    /* use numeric to set the ctype */
    setlocale(LC_CTYPE, locale_numeric);
#endif

    /* Get formatting information for numeric */
    setlocale(LC_NUMERIC, locale_numeric);
    extlconv = localeconv();

    /* Must copy data now in case setlocale() overwrites it */
    worklconv.decimal_point = strdup(extlconv->decimal_point);
    worklconv.thousands_sep = strdup(extlconv->thousands_sep);
    worklconv.grouping = strdup(extlconv->grouping);

#ifdef WIN32
    /* use monetary to set the ctype */
    setlocale(LC_CTYPE, locale_monetary);
#endif

    /* Get formatting information for monetary */
    setlocale(LC_MONETARY, locale_monetary);
    extlconv = localeconv();

    /* Must copy data now in case setlocale() overwrites it */
    worklconv.int_curr_symbol = strdup(extlconv->int_curr_symbol);
    worklconv.currency_symbol = strdup(extlconv->currency_symbol);
    worklconv.mon_decimal_point = strdup(extlconv->mon_decimal_point);
    worklconv.mon_thousands_sep = strdup(extlconv->mon_thousands_sep);
    worklconv.mon_grouping = strdup(extlconv->mon_grouping);
    worklconv.positive_sign = strdup(extlconv->positive_sign);
    worklconv.negative_sign = strdup(extlconv->negative_sign);
    /* Copy scalar fields as well */
    worklconv.int_frac_digits = extlconv->int_frac_digits;
    worklconv.frac_digits = extlconv->frac_digits;
    worklconv.p_cs_precedes = extlconv->p_cs_precedes;
    worklconv.p_sep_by_space = extlconv->p_sep_by_space;
    worklconv.n_cs_precedes = extlconv->n_cs_precedes;
    worklconv.n_sep_by_space = extlconv->n_sep_by_space;
    worklconv.p_sign_posn = extlconv->p_sign_posn;
    worklconv.n_sign_posn = extlconv->n_sign_posn;

    /*
     * Restore the prevailing locale settings; failure to do so is fatal.
     * Possibly we could limp along with nondefault LC_MONETARY or LC_NUMERIC,
     * but proceeding with the wrong value of LC_CTYPE would certainly be bad
     * news; and considering that the prevailing LC_MONETARY and LC_NUMERIC
     * are almost certainly "C", there's really no reason that restoring those
     * should fail.
     */
#ifdef WIN32
    if (!setlocale(LC_CTYPE, save_lc_ctype))
        elog(FATAL, "failed to restore LC_CTYPE to \"%s\"", save_lc_ctype);
#endif
    if (!setlocale(LC_MONETARY, save_lc_monetary))
        elog(FATAL, "failed to restore LC_MONETARY to \"%s\"", save_lc_monetary);
    if (!setlocale(LC_NUMERIC, save_lc_numeric))
        elog(FATAL, "failed to restore LC_NUMERIC to \"%s\"", save_lc_numeric);

    /*
     * At this point we've done our best to clean up, and can call functions
     * that might possibly throw errors with a clean conscience.  But let's
     * make sure we don't leak any already-strdup'd fields in worklconv.
     */
    PG_TRY();
    {
        int         encoding;

        /* Release the pstrdup'd locale names */
        pfree(save_lc_monetary);
        pfree(save_lc_numeric);
#ifdef WIN32
        pfree(save_lc_ctype);
#endif

        /* If any of the preceding strdup calls failed, complain now. */
        if (!struct_lconv_is_valid(&worklconv))
            ereport(ERROR,
                    (errcode(ERRCODE_OUT_OF_MEMORY),
                     errmsg("out of memory")));

        /*
         * Now we must perform encoding conversion from whatever's associated
         * with the locales into the database encoding.  If we can't identify
         * the encoding implied by LC_NUMERIC or LC_MONETARY (ie we get -1),
         * use PG_SQL_ASCII, which will result in just validating that the
         * strings are OK in the database encoding.
         */
        encoding = pg_get_encoding_from_locale(locale_numeric, true);
        if (encoding < 0)
            encoding = PG_SQL_ASCII;

        db_encoding_convert(encoding, &worklconv.decimal_point);
        db_encoding_convert(encoding, &worklconv.thousands_sep);
        /* grouping is not text and does not require conversion */

        encoding = pg_get_encoding_from_locale(locale_monetary, true);
        if (encoding < 0)
            encoding = PG_SQL_ASCII;

        db_encoding_convert(encoding, &worklconv.int_curr_symbol);
        db_encoding_convert(encoding, &worklconv.currency_symbol);
        db_encoding_convert(encoding, &worklconv.mon_decimal_point);
        db_encoding_convert(encoding, &worklconv.mon_thousands_sep);
        /* mon_grouping is not text and does not require conversion */
        db_encoding_convert(encoding, &worklconv.positive_sign);
        db_encoding_convert(encoding, &worklconv.negative_sign);
    }
    PG_CATCH();
    {
        free_struct_lconv(&worklconv);
        PG_RE_THROW();
    }
    PG_END_TRY();

    /*
     * Everything is good, so save the results.
     */
    CurrentLocaleConv = worklconv;
    CurrentLocaleConvAllocated = true;
    CurrentLocaleConvValid = true;
    return &CurrentLocaleConv;
}

wchar2char()

size_t wchar2char	(	char *	to,
		const wchar_t *	from,
		size_t	tolen,
		pg_locale_t	locale
	)

Definition at line 1774 of file pg_locale.c.

References Assert, elog, ERROR, GetDatabaseEncoding(), pg_locale_struct::info, locale_t, PG_UTF8, pg_locale_struct::provider, and wcstombs_l.

Referenced by cache_locale_time(), lowerstr_with_len(), str_initcap(), str_tolower(), and str_toupper().

{
    size_t      result;

    Assert(!locale || locale->provider == COLLPROVIDER_LIBC);

    if (tolen == 0)
        return 0;

#ifdef WIN32

    /*
     * On Windows, the "Unicode" locales assume UTF16 not UTF8 encoding, and
     * for some reason mbstowcs and wcstombs won't do this for us, so we use
     * MultiByteToWideChar().
     */
    if (GetDatabaseEncoding() == PG_UTF8)
    {
        result = WideCharToMultiByte(CP_UTF8, 0, from, -1, to, tolen,
                                     NULL, NULL);
        /* A zero return is failure */
        if (result <= 0)
            result = -1;
        else
        {
            Assert(result <= tolen);
            /* Microsoft counts the zero terminator in the result */
            result--;
        }
    }
    else
#endif                          /* WIN32 */
    if (locale == (pg_locale_t) 0)
    {
        /* Use wcstombs directly for the default locale */
        result = wcstombs(to, from, tolen);
    }
    else
    {
#ifdef HAVE_LOCALE_T
#ifdef HAVE_WCSTOMBS_L
        /* Use wcstombs_l for nondefault locales */
        result = wcstombs_l(to, from, tolen, locale->info.lt);
#else                           /* !HAVE_WCSTOMBS_L */
        /* We have to temporarily set the locale as current ... ugh */
        locale_t    save_locale = uselocale(locale->info.lt);

        result = wcstombs(to, from, tolen);

        uselocale(save_locale);
#endif                          /* HAVE_WCSTOMBS_L */
#else                           /* !HAVE_LOCALE_T */
        /* Can't have locale != 0 without HAVE_LOCALE_T */
        elog(ERROR, "wcstombs_l is not available");
        result = 0;             /* keep compiler quiet */
#endif                          /* HAVE_LOCALE_T */
    }

    return result;
}

Variable Documentation

locale_messages

char* locale_messages

Definition at line 90 of file pg_locale.c.

locale_monetary

char* locale_monetary

Definition at line 91 of file pg_locale.c.

Referenced by PGLC_localeconv().

locale_numeric

char* locale_numeric

Definition at line 92 of file pg_locale.c.

Referenced by PGLC_localeconv().

locale_time

char* locale_time

Definition at line 93 of file pg_locale.c.

Referenced by cache_locale_time().

localized_abbrev_days

char* localized_abbrev_days[]

Definition at line 96 of file pg_locale.c.

Referenced by cache_locale_time(), and DCH_to_char().

localized_abbrev_months

char* localized_abbrev_months[]

Definition at line 98 of file pg_locale.c.

Referenced by cache_locale_time(), and DCH_to_char().

localized_full_days

char* localized_full_days[]

Definition at line 97 of file pg_locale.c.

Referenced by cache_locale_time(), and DCH_to_char().

localized_full_months

char* localized_full_months[]

Definition at line 99 of file pg_locale.c.

Referenced by cache_locale_time(), and DCH_to_char().