I am sorry, I forgot to mention important detail: _BLANK is used to implement
`is[w]print` macros in `[w]ctype.h`. This means that they may return non-zero
for tab in some cases.
It is been quite a while since I discovered it, and some details have slipped
my mind.
Disregard my comment regarding *correct* return value in "C" locale. Actually,
there is a comment in Microsoft headers saying that _BLANK only handles space
character and that tab should be handled separately.
- Kirill Makurin
________________________________
From: Kirill Makurin <maiddais...@outlook.com>
Sent: Sunday, June 1, 2025 7:46 PM
To: mingw-w64-public <mingw-w64-public@lists.sourceforge.net>
Subject: [Mingw-w64-public] is[w]ctype disagree whether tab is _BLANK
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
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