Hi,
(It is not directly related to mingw-w64, but this got me very confused and
this issue is related to CRTs.)
The `_isctype('\t', _BLANK)` and `iswctype(L'\t', _BLANK)` disagree. They
disagree not only for different locales (which would make sense), but also for
different CRTs.
I attached a simple program which can be used to reproduce this behavior.
Here's the summary:
MSVCRT, "C" locale:
```
_isctype: 0
iswctype: 1
```
MSVCRT, locales other than "C":
```
_isctype: 1
iswctype: 1
```
UCRT, "C" locale:
```
_isctype: 0
iswctype: 0
```
UCRT, locales other than "C":
```
_isctype: 1
iswctype: 0
```
If I am correct, both should return non-zero in "C" locale.
I compared this to behavior of is[w]blank in glibc. They always return non-zero.
- Kirill Makurin
#define __USE_MINGW_ANSI_STDIO 0
#define _CTYPE_DISABLE_MACROS
#include <ctype.h>
#include <locale.h>
#include <stdio.h>
#include <wctype.h>
int main (int argc, char **argv) {
setlocale (LC_ALL, argc > 1 ? argv[1] : "C");
wprintf (L"isblank(\\t): %d\n", !!_isctype ('\t', _BLANK));
wprintf (L"iswblank(\\t): %d\n", !!iswctype (L'\t', _BLANK));
return 0;
}
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