greenplumn chklocale 源码
greenplumn chklocale 代码
文件路径：/src/port/chklocale.c
/*-------------------------------------------------------------------------
*
* chklocale.c
* Functions for handling locale-related info
*
*
* Copyright (c) 1996-2019, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/port/chklocale.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#include "mb/pg_wchar.h"
/*
* This table needs to recognize all the CODESET spellings for supported
* backend encodings, as well as frontend-only encodings where possible
* (the latter case is currently only needed for initdb to recognize
* error situations). On Windows, we rely on entries for codepage
* numbers (CPnnn).
*
* Note that we search the table with pg_strcasecmp(), so variant
* capitalizations don't need their own entries.
*/
struct encoding_match
{
enum pg_enc pg_enc_code;
const char *system_enc_name;
};
static const struct encoding_match encoding_match_list[] = {
{PG_EUC_JP, "EUC-JP"},
{PG_EUC_JP, "eucJP"},
{PG_EUC_JP, "IBM-eucJP"},
{PG_EUC_JP, "sdeckanji"},
{PG_EUC_JP, "CP20932"},
{PG_EUC_CN, "EUC-CN"},
{PG_EUC_CN, "eucCN"},
{PG_EUC_CN, "IBM-eucCN"},
{PG_EUC_CN, "GB2312"},
{PG_EUC_CN, "dechanzi"},
{PG_EUC_CN, "CP20936"},
{PG_EUC_KR, "EUC-KR"},
{PG_EUC_KR, "eucKR"},
{PG_EUC_KR, "IBM-eucKR"},
{PG_EUC_KR, "deckorean"},
{PG_EUC_KR, "5601"},
{PG_EUC_KR, "CP51949"},
{PG_EUC_TW, "EUC-TW"},
{PG_EUC_TW, "eucTW"},
{PG_EUC_TW, "IBM-eucTW"},
{PG_EUC_TW, "cns11643"},
/* No codepage for EUC-TW ? */
{PG_UTF8, "UTF-8"},
{PG_UTF8, "utf8"},
{PG_UTF8, "CP65001"},
{PG_LATIN1, "ISO-8859-1"},
{PG_LATIN1, "ISO8859-1"},
{PG_LATIN1, "iso88591"},
{PG_LATIN1, "CP28591"},
{PG_LATIN2, "ISO-8859-2"},
{PG_LATIN2, "ISO8859-2"},
{PG_LATIN2, "iso88592"},
{PG_LATIN2, "CP28592"},
{PG_LATIN3, "ISO-8859-3"},
{PG_LATIN3, "ISO8859-3"},
{PG_LATIN3, "iso88593"},
{PG_LATIN3, "CP28593"},
{PG_LATIN4, "ISO-8859-4"},
{PG_LATIN4, "ISO8859-4"},
{PG_LATIN4, "iso88594"},
{PG_LATIN4, "CP28594"},
{PG_LATIN5, "ISO-8859-9"},
{PG_LATIN5, "ISO8859-9"},
{PG_LATIN5, "iso88599"},
{PG_LATIN5, "CP28599"},
{PG_LATIN6, "ISO-8859-10"},
{PG_LATIN6, "ISO8859-10"},
{PG_LATIN6, "iso885910"},
{PG_LATIN7, "ISO-8859-13"},
{PG_LATIN7, "ISO8859-13"},
{PG_LATIN7, "iso885913"},
{PG_LATIN8, "ISO-8859-14"},
{PG_LATIN8, "ISO8859-14"},
{PG_LATIN8, "iso885914"},
{PG_LATIN9, "ISO-8859-15"},
{PG_LATIN9, "ISO8859-15"},
{PG_LATIN9, "iso885915"},
{PG_LATIN9, "CP28605"},
{PG_LATIN10, "ISO-8859-16"},
{PG_LATIN10, "ISO8859-16"},
{PG_LATIN10, "iso885916"},
{PG_KOI8R, "KOI8-R"},
{PG_KOI8R, "CP20866"},
{PG_KOI8U, "KOI8-U"},
{PG_KOI8U, "CP21866"},
{PG_WIN866, "CP866"},
{PG_WIN874, "CP874"},
{PG_WIN1250, "CP1250"},
{PG_WIN1251, "CP1251"},
{PG_WIN1251, "ansi-1251"},
{PG_WIN1252, "CP1252"},
{PG_WIN1253, "CP1253"},
{PG_WIN1254, "CP1254"},
{PG_WIN1255, "CP1255"},
{PG_WIN1256, "CP1256"},
{PG_WIN1257, "CP1257"},
{PG_WIN1258, "CP1258"},
{PG_ISO_8859_5, "ISO-8859-5"},
{PG_ISO_8859_5, "ISO8859-5"},
{PG_ISO_8859_5, "iso88595"},
{PG_ISO_8859_5, "CP28595"},
{PG_ISO_8859_6, "ISO-8859-6"},
{PG_ISO_8859_6, "ISO8859-6"},
{PG_ISO_8859_6, "iso88596"},
{PG_ISO_8859_6, "CP28596"},
{PG_ISO_8859_7, "ISO-8859-7"},
{PG_ISO_8859_7, "ISO8859-7"},
{PG_ISO_8859_7, "iso88597"},
{PG_ISO_8859_7, "CP28597"},
{PG_ISO_8859_8, "ISO-8859-8"},
{PG_ISO_8859_8, "ISO8859-8"},
{PG_ISO_8859_8, "iso88598"},
{PG_ISO_8859_8, "CP28598"},
{PG_SJIS, "SJIS"},
{PG_SJIS, "PCK"},
{PG_SJIS, "CP932"},
{PG_SJIS, "SHIFT_JIS"},
{PG_BIG5, "BIG5"},
{PG_BIG5, "BIG5HKSCS"},
{PG_BIG5, "Big5-HKSCS"},
{PG_BIG5, "CP950"},
{PG_GBK, "GBK"},
{PG_GBK, "CP936"},
{PG_UHC, "UHC"},
{PG_UHC, "CP949"},
{PG_JOHAB, "JOHAB"},
{PG_JOHAB, "CP1361"},
{PG_GB18030, "GB18030"},
{PG_GB18030, "CP54936"},
{PG_SHIFT_JIS_2004, "SJIS_2004"},
{PG_SQL_ASCII, "US-ASCII"},
{PG_SQL_ASCII, NULL} /* end marker */
};
#ifdef WIN32
/*
* On Windows, use CP<code page number> instead of the nl_langinfo() result
*
* Visual Studio 2012 expanded the set of valid LC_CTYPE values, so have its
* locale machinery determine the code page. See comments at IsoLocaleName().
* For other compilers, follow the locale's predictable format.
*
* Visual Studio 2015 should still be able to do the same, but the declaration
* of lc_codepage is missing in _locale_t, causing this code compilation to
* fail, hence this falls back instead on GetLocaleInfoEx. VS 2015 may be an
* exception and post-VS2015 versions should be able to handle properly the
* codepage number using _create_locale(). So, instead of the same logic as
* VS 2012 and VS 2013, this routine uses GetLocaleInfoEx to parse short
* locale names like "de-DE", "fr-FR", etc. If those cannot be parsed correctly
* process falls back to the pre-VS-2010 manual parsing done with
* using <Language>_<Country>.<CodePage> as a base.
*
* Returns a malloc()'d string for the caller to free.
*/
static char *
win32_langinfo(const char *ctype)
{
char *r = NULL;
#if (_MSC_VER >= 1700) && (_MSC_VER < 1900)
_locale_t loct = NULL;
loct = _create_locale(LC_CTYPE, ctype);
if (loct != NULL)
{
r = malloc(16); /* excess */
if (r != NULL)
sprintf(r, "CP%u", loct->locinfo->lc_codepage);
_free_locale(loct);
}
#else
char *codepage;
#if (_MSC_VER >= 1900)
uint32 cp;
WCHAR wctype[LOCALE_NAME_MAX_LENGTH];
memset(wctype, 0, sizeof(wctype));
MultiByteToWideChar(CP_ACP, 0, ctype, -1, wctype, LOCALE_NAME_MAX_LENGTH);
if (GetLocaleInfoEx(wctype,
LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
(LPWSTR) &cp, sizeof(cp) / sizeof(WCHAR)) > 0)
{
r = malloc(16); /* excess */
if (r != NULL)
sprintf(r, "CP%u", cp);
}
else
#endif
{
/*
* Locale format on Win32 is <Language>_<Country>.<CodePage> . For
* example, English_United States.1252.
*/
codepage = strrchr(ctype, '.');
if (codepage != NULL)
{
int ln;
codepage++;
ln = strlen(codepage);
r = malloc(ln + 3);
if (r != NULL)
sprintf(r, "CP%s", codepage);
}
}
#endif
return r;
}
#ifndef FRONTEND
/*
* Given a Windows code page identifier, find the corresponding PostgreSQL
* encoding. Issue a warning and return -1 if none found.
*/
int
pg_codepage_to_encoding(UINT cp)
{
char sys[16];
int i;
sprintf(sys, "CP%u", cp);
/* Check the table */
for (i = 0; encoding_match_list[i].system_enc_name; i++)
if (pg_strcasecmp(sys, encoding_match_list[i].system_enc_name) == 0)
return encoding_match_list[i].pg_enc_code;
ereport(WARNING,
(errmsg("could not determine encoding for codeset \"%s\"", sys)));
return -1;
}
#endif
#endif /* WIN32 */
#if (defined(HAVE_LANGINFO_H) && defined(CODESET)) || defined(WIN32)
/*
* Given a setting for LC_CTYPE, return the Postgres ID of the associated
* encoding, if we can determine it. Return -1 if we can't determine it.
*
* Pass in NULL to get the encoding for the current locale setting.
* Pass "" to get the encoding selected by the server's environment.
*
* If the result is PG_SQL_ASCII, callers should treat it as being compatible
* with any desired encoding.
*
* If running in the backend and write_message is false, this function must
* cope with the possibility that elog() and palloc() are not yet usable.
*/
int
pg_get_encoding_from_locale(const char *ctype, bool write_message)
{
char *sys;
int i;
/* Get the CODESET property, and also LC_CTYPE if not passed in */
if (ctype)
{
char *save;
char *name;
/* If locale is C or POSIX, we can allow all encodings */
if (pg_strcasecmp(ctype, "C") == 0 ||
pg_strcasecmp(ctype, "POSIX") == 0)
return PG_SQL_ASCII;
save = setlocale(LC_CTYPE, NULL);
if (!save)
return -1; /* setlocale() broken? */
/* must copy result, or it might change after setlocale */
save = strdup(save);
if (!save)
return -1; /* out of memory; unlikely */
name = setlocale(LC_CTYPE, ctype);
if (!name)
{
free(save);
return -1; /* bogus ctype passed in? */
}
#ifndef WIN32
sys = nl_langinfo(CODESET);
if (sys)
sys = strdup(sys);
#else
sys = win32_langinfo(name);
#endif
setlocale(LC_CTYPE, save);
free(save);
}
else
{
/* much easier... */
ctype = setlocale(LC_CTYPE, NULL);
if (!ctype)
return -1; /* setlocale() broken? */
/* If locale is C or POSIX, we can allow all encodings */
if (pg_strcasecmp(ctype, "C") == 0 ||
pg_strcasecmp(ctype, "POSIX") == 0)
return PG_SQL_ASCII;
#ifndef WIN32
sys = nl_langinfo(CODESET);
if (sys)
sys = strdup(sys);
#else
sys = win32_langinfo(ctype);
#endif
}
if (!sys)
return -1; /* out of memory; unlikely */
/* Check the table */
for (i = 0; encoding_match_list[i].system_enc_name; i++)
{
if (pg_strcasecmp(sys, encoding_match_list[i].system_enc_name) == 0)
{
free(sys);
return encoding_match_list[i].pg_enc_code;
}
}
/* Special-case kluges for particular platforms go here */
#ifdef __darwin__
/*
* Current macOS has many locales that report an empty string for CODESET,
* but they all seem to actually use UTF-8.
*/
if (strlen(sys) == 0)
{
free(sys);
return PG_UTF8;
}
#endif
/*
* We print a warning if we got a CODESET string but couldn't recognize
* it. This means we need another entry in the table.
*/
if (write_message)
{
#ifdef FRONTEND
fprintf(stderr, _("could not determine encoding for locale \"%s\": codeset is \"%s\""),
ctype, sys);
/* keep newline separate so there's only one translatable string */
fputc('\n', stderr);
#else
ereport(WARNING,
(errmsg("could not determine encoding for locale \"%s\": codeset is \"%s\"",
ctype, sys)));
#endif
}
free(sys);
return -1;
}
#else /* (HAVE_LANGINFO_H && CODESET) || WIN32 */
/*
* stub if no multi-language platform support
*
* Note: we could return -1 here, but that would have the effect of
* forcing users to specify an encoding to initdb on such platforms.
* It seems better to silently default to SQL_ASCII.
*/
int
pg_get_encoding_from_locale(const char *ctype, bool write_message)
{
return PG_SQL_ASCII;
}
#endif /* (HAVE_LANGINFO_H && CODESET) || WIN32 */
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