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Be more careful about extracting encoding from locale strings on Windows.

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GetLocaleInfoEx() can fail on strings that setlocale() was perfectly
happy with.  A common way for that to happen is if the locale string
is actually a Unix-style string, say "et_EE.UTF-8".  In that case,
what's after the dot is an encoding name, not a Windows codepage number;
blindly treating it as a codepage number led to failure, with a fairly
silly error message.  Hence, check to see if what's after the dot is
all digits, and if not, treat it as a literal encoding name rather than
a codepage number.  This will do the right thing with many Unix-style
locale strings, and produce a more sensible error message otherwise.

Somewhat independently of that, treat a zero (CP_ACP) result from
GetLocaleInfoEx() as meaning that we must use UTF-8 encoding.

Back-patch to all supported branches.

Juan José Santamaría Flecha

Discussion: https://postgr.es/m/24905.1585445371@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2020-03-30 11:14:58 -04:00
parent 24566b359d
commit 8c49454caa
1 changed files with 24 additions and 5 deletions
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29
src/port/chklocale.c
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@ -239,25 +239,44 @@ win32_langinfo(const char *ctype)
{
r = malloc(16); /* excess */
if (r != NULL)
sprintf(r, "CP%u", cp);
{
/*
* If the return value is CP_ACP that means no ANSI code page is
* available, so only Unicode can be used for the locale.
*/
if (cp == CP_ACP)
strcpy(r, "utf8");
else
sprintf(r, "CP%u", cp);
}
}
else
#endif
{
/*
* Locale format on Win32 is <Language>_<Country>.<CodePage> . For
* example, English_United States.1252.
* Locale format on Win32 is <Language>_<Country>.<CodePage>. For
* example, English_United States.1252. If we see digits after the
* last dot, assume it's a codepage number. Otherwise, we might be
* dealing with a Unix-style locale string; Windows' setlocale() will
* take those even though GetLocaleInfoEx() won't, so we end up here.
* In that case, just return what's after the last dot and hope we can
* find it in our table.
*/
codepage = strrchr(ctype, '.');
if (codepage != NULL)
{
int ln;
size_t ln;
codepage++;
ln = strlen(codepage);
r = malloc(ln + 3);
if (r != NULL)
sprintf(r, "CP%s", codepage);
{
if (strspn(codepage, "0123456789") == ln)
sprintf(r, "CP%s", codepage);
else
strcpy(r, codepage);
}
}
}