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Change initdb and CREATE DATABASE to actively reject attempts to create
databases with encodings that are incompatible with the server's LC_CTYPE locale, when we can determine that (which we can on most modern platforms, I believe). C/POSIX locale is compatible with all encodings, of course, so there is still some usefulness to CREATE DATABASE's ENCODING option, but this will insulate us against all sorts of recurring complaints caused by mismatched settings. I moved initdb's existing LC_CTYPE-to-encoding mapping knowledge into a new src/port/ file so it could be shared by CREATE DATABASE.
This commit is contained in:
Tom Lane
246
src/port/chklocale.c
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246
src/port/chklocale.c
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/*-------------------------------------------------------------------------
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*
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* chklocale.c
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* Functions for handling locale-related info
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*
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*
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* Copyright (c) 1996-2007, PostgreSQL Global Development Group
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/port/chklocale.c,v 1.1 2007/09/28 22:25:49 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FRONTEND
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#include "postgres.h"
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#else
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#include "postgres_fe.h"
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#endif
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#include <locale.h>
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#ifdef HAVE_LANGINFO_H
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#include <langinfo.h>
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#endif
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#include "mb/pg_wchar.h"
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#if defined(HAVE_LANGINFO_H) && defined(CODESET)
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/*
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* This table needs to recognize all the CODESET spellings for supported
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* backend encodings. We don't need to handle frontend-only encodings.
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* Note that we search the table with pg_strcasecmp(), so variant
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* capitalizations don't need their own entries.
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*/
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struct encoding_match
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{
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enum pg_enc pg_enc_code;
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const char *system_enc_name;
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};
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static const struct encoding_match encoding_match_list[] = {
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{PG_EUC_JP, "EUC-JP"},
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{PG_EUC_JP, "eucJP"},
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{PG_EUC_JP, "IBM-eucJP"},
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{PG_EUC_JP, "sdeckanji"},
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{PG_EUC_CN, "EUC-CN"},
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{PG_EUC_CN, "eucCN"},
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{PG_EUC_CN, "IBM-eucCN"},
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{PG_EUC_CN, "GB2312"},
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{PG_EUC_CN, "dechanzi"},
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{PG_EUC_KR, "EUC-KR"},
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{PG_EUC_KR, "eucKR"},
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{PG_EUC_KR, "IBM-eucKR"},
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{PG_EUC_KR, "deckorean"},
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{PG_EUC_KR, "5601"},
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{PG_EUC_TW, "EUC-TW"},
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{PG_EUC_TW, "eucTW"},
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{PG_EUC_TW, "IBM-eucTW"},
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{PG_EUC_TW, "cns11643"},
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{PG_UTF8, "UTF-8"},
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{PG_UTF8, "utf8"},
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{PG_LATIN1, "ISO-8859-1"},
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{PG_LATIN1, "ISO8859-1"},
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{PG_LATIN1, "iso88591"},
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{PG_LATIN2, "ISO-8859-2"},
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{PG_LATIN2, "ISO8859-2"},
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{PG_LATIN2, "iso88592"},
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{PG_LATIN3, "ISO-8859-3"},
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{PG_LATIN3, "ISO8859-3"},
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{PG_LATIN3, "iso88593"},
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{PG_LATIN4, "ISO-8859-4"},
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{PG_LATIN4, "ISO8859-4"},
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{PG_LATIN4, "iso88594"},
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{PG_LATIN5, "ISO-8859-9"},
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{PG_LATIN5, "ISO8859-9"},
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{PG_LATIN5, "iso88599"},
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{PG_LATIN6, "ISO-8859-10"},
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{PG_LATIN6, "ISO8859-10"},
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{PG_LATIN6, "iso885910"},
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{PG_LATIN7, "ISO-8859-13"},
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{PG_LATIN7, "ISO8859-13"},
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{PG_LATIN7, "iso885913"},
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{PG_LATIN8, "ISO-8859-14"},
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{PG_LATIN8, "ISO8859-14"},
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{PG_LATIN8, "iso885914"},
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{PG_LATIN9, "ISO-8859-15"},
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{PG_LATIN9, "ISO8859-15"},
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{PG_LATIN9, "iso885915"},
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{PG_LATIN10, "ISO-8859-16"},
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{PG_LATIN10, "ISO8859-16"},
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{PG_LATIN10, "iso885916"},
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{PG_KOI8R, "KOI8-R"},
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{PG_WIN1252, "CP1252"},
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{PG_WIN1253, "CP1253"},
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{PG_WIN1254, "CP1254"},
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{PG_WIN1255, "CP1255"},
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{PG_WIN1256, "CP1256"},
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{PG_WIN1257, "CP1257"},
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{PG_WIN1258, "CP1258"},
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#ifdef NOT_VERIFIED
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{PG_WIN874, "???"},
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#endif
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{PG_WIN1251, "CP1251"},
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{PG_WIN866, "CP866"},
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{PG_ISO_8859_5, "ISO-8859-5"},
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{PG_ISO_8859_5, "ISO8859-5"},
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{PG_ISO_8859_5, "iso88595"},
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{PG_ISO_8859_6, "ISO-8859-6"},
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{PG_ISO_8859_6, "ISO8859-6"},
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{PG_ISO_8859_6, "iso88596"},
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{PG_ISO_8859_7, "ISO-8859-7"},
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{PG_ISO_8859_7, "ISO8859-7"},
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{PG_ISO_8859_7, "iso88597"},
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{PG_ISO_8859_8, "ISO-8859-8"},
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{PG_ISO_8859_8, "ISO8859-8"},
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{PG_ISO_8859_8, "iso88598"},
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{PG_SQL_ASCII, NULL} /* end marker */
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};
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/*
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* Given a setting for LC_CTYPE, return the Postgres ID of the associated
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* encoding, if we can determine it.
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*
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* Pass in NULL to get the encoding for the current locale setting.
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*
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* If the result is PG_SQL_ASCII, callers should treat it as being compatible
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* with any desired encoding. We return this if the locale is C/POSIX or we
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* can't determine the encoding.
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*/
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int
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pg_get_encoding_from_locale(const char *ctype)
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{
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char *sys;
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int i;
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if (ctype)
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{
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char *save;
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save = setlocale(LC_CTYPE, NULL);
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if (!save)
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return PG_SQL_ASCII; /* setlocale() broken? */
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/* must copy result, or it might change after setlocale */
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save = strdup(save);
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if (!save)
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return PG_SQL_ASCII; /* out of memory; unlikely */
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if (!setlocale(LC_CTYPE, ctype))
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{
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free(save);
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return PG_SQL_ASCII; /* bogus ctype passed in? */
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}
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sys = nl_langinfo(CODESET);
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if (sys)
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sys = strdup(sys);
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setlocale(LC_CTYPE, save);
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free(save);
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}
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else
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{
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/* much easier... */
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ctype = setlocale(LC_CTYPE, NULL);
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if (!ctype)
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return PG_SQL_ASCII; /* setlocale() broken? */
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sys = nl_langinfo(CODESET);
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if (sys)
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sys = strdup(sys);
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}
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if (!sys)
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return PG_SQL_ASCII; /* out of memory; unlikely */
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if (pg_strcasecmp(ctype, "C") == 0 || pg_strcasecmp(ctype, "POSIX") == 0)
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{
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free(sys);
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return PG_SQL_ASCII;
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}
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for (i = 0; encoding_match_list[i].system_enc_name; i++)
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{
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if (pg_strcasecmp(sys, encoding_match_list[i].system_enc_name) == 0)
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{
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free(sys);
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return encoding_match_list[i].pg_enc_code;
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}
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}
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/*
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* We print a warning if we got a CODESET string but couldn't recognize
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* it. This means we need another entry in the table.
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*/
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#ifdef FRONTEND
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fprintf(stderr, _("could not determine encoding for locale \"%s\": codeset is \"%s\""),
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ctype, sys);
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/* keep newline separate so there's only one translatable string */
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fputc('\n', stderr);
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#else
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ereport(WARNING,
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(errmsg("could not determine encoding for locale \"%s\": codeset is \"%s\"",
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ctype, sys),
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errdetail("Please report this to <pgsql-bugs@postgresql.org>.")));
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#endif
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free(sys);
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return PG_SQL_ASCII;
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}
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#else /* !(HAVE_LANGINFO_H && CODESET) */
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/*
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* stub if no platform support
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*/
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int
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pg_get_encoding_from_locale(const char *ctype)
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{
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return PG_SQL_ASCII;
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}
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#endif /* HAVE_LANGINFO_H && CODESET */
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