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/*-------------------------------------------------------------------------
*
* win32setlocale.c
* Wrapper to work around bugs in Windows setlocale() implementation
*
* Copyright (c) 2011-2022, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/port/win32setlocale.c
*
*
* The setlocale() function in Windows is broken in two ways. First, it
* has a problem with locale names that have a dot in the country name. For
* example:
*
* "Chinese (Traditional)_Hong Kong S.A.R..950"
*
* For some reason, setlocale() doesn't accept that as argument, even though
* setlocale(LC_ALL, NULL) returns exactly that. Fortunately, it accepts
* various alternative names for such countries, so to work around the broken
* setlocale() function, we map the troublemaking locale names to accepted
* aliases, before calling setlocale().
*
* The second problem is that the locale name for "Norwegian (Bokmål)"
* contains a non-ASCII character. That's problematic, because it's not clear
* what encoding the locale name itself is supposed to be in, when you
* haven't yet set a locale. Also, it causes problems when the cluster
* contains databases with different encodings, as the locale name is stored
* in the pg_database system catalog. To work around that, when setlocale()
* returns that locale name, map it to a pure-ASCII alias for the same
* locale.
*-------------------------------------------------------------------------
*/
#include "c.h"
#undef setlocale
struct locale_map
{
/*
* String in locale name to replace. Can be a single string (end is NULL),
* or separate start and end strings. If two strings are given, the locale
* name must contain both of them, and everything between them is
* replaced. This is used for a poor-man's regexp search, allowing
* replacement of "start.*end".
*/
const char *locale_name_start;
const char *locale_name_end;
const char *replacement; /* string to replace the match with */
};
/*
* Mappings applied before calling setlocale(), to the argument.
*/
static const struct locale_map locale_map_argument[] = {
/*
* "HKG" is listed here:
* http://msdn.microsoft.com/en-us/library/cdax410z%28v=vs.71%29.aspx
* (Country/Region Strings).
*
* "ARE" is the ISO-3166 three-letter code for U.A.E. It is not on the
* above list, but seems to work anyway.
*/
{"Hong Kong S.A.R.", NULL, "HKG"},
{"U.A.E.", NULL, "ARE"},
/*
* The ISO-3166 country code for Macau S.A.R. is MAC, but Windows doesn't
* seem to recognize that. And Macau isn't listed in the table of accepted
* abbreviations linked above. Fortunately, "ZHM" seems to be accepted as
* an alias for "Chinese (Traditional)_Macau S.A.R..950". I'm not sure
* where "ZHM" comes from, must be some legacy naming scheme. But hey, it
* works.
*
* Note that unlike HKG and ARE, ZHM is an alias for the *whole* locale
* name, not just the country part.
*
* Some versions of Windows spell it "Macau", others "Macao".
*/
{"Chinese (Traditional)_Macau S.A.R..950", NULL, "ZHM"},
{"Chinese_Macau S.A.R..950", NULL, "ZHM"},
{"Chinese (Traditional)_Macao S.A.R..950", NULL, "ZHM"},
{"Chinese_Macao S.A.R..950", NULL, "ZHM"},
{NULL, NULL, NULL}
};
/*
* Mappings applied after calling setlocale(), to its return value.
*/
static const struct locale_map locale_map_result[] = {
/*
* "Norwegian (Bokmål)" locale name contains the a-ring character.
* Map it to a pure-ASCII alias.
*
* It's not clear what encoding setlocale() uses when it returns the
* locale name, so to play it safe, we search for "Norwegian (Bok*l)".
*
* Just to make life even more complicated, some versions of Windows spell
* the locale name without parentheses. Translate that too.
*/
{"Norwegian (Bokm", "l)_Norway", "Norwegian_Norway"},
{"Norwegian Bokm", "l_Norway", "Norwegian_Norway"},
{NULL, NULL, NULL}
};
#define MAX_LOCALE_NAME_LEN 100
static const char *
map_locale(const struct locale_map *map, const char *locale)
{
static char aliasbuf[MAX_LOCALE_NAME_LEN];
int i;
/* Check if the locale name matches any of the problematic ones. */
for (i = 0; map[i].locale_name_start != NULL; i++)
{
const char *needle_start = map[i].locale_name_start;
const char *needle_end = map[i].locale_name_end;
const char *replacement = map[i].replacement;
char *match;
char *match_start = NULL;
char *match_end = NULL;
match = strstr(locale, needle_start);
if (match)
{
/*
* Found a match for the first part. If this was a two-part
* replacement, find the second part.
*/
match_start = match;
if (needle_end)
{
match = strstr(match_start + strlen(needle_start), needle_end);
if (match)
match_end = match + strlen(needle_end);
else
match_start = NULL;
}
else
match_end = match_start + strlen(needle_start);
}
if (match_start)
{
/* Found a match. Replace the matched string. */
int matchpos = match_start - locale;
int replacementlen = strlen(replacement);
char *rest = match_end;
int restlen = strlen(rest);
/* check that the result fits in the static buffer */
if (matchpos + replacementlen + restlen + 1 > MAX_LOCALE_NAME_LEN)
return NULL;
memcpy(&aliasbuf[0], &locale[0], matchpos);
memcpy(&aliasbuf[matchpos], replacement, replacementlen);
/* includes null terminator */
memcpy(&aliasbuf[matchpos + replacementlen], rest, restlen + 1);
return aliasbuf;
}
}
/* no match, just return the original string */
return locale;
}
char *
pgwin32_setlocale(int category, const char *locale)
{
const char *argument;
char *result;
if (locale == NULL)
argument = NULL;
else
argument = map_locale(locale_map_argument, locale);
/* Call the real setlocale() function */
result = setlocale(category, argument);
/*
* setlocale() is specified to return a "char *" that the caller is
* forbidden to modify, so casting away the "const" is innocuous.
*/
if (result)
result = unconstify(char *, map_locale(locale_map_result, result));
return result;
}
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