#15990: uchar.h defines the types char16_t, char32_t incorrectly
-----------------------+-----------------------------
Reporter: bhaible | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: - General | Version: R1/Development
Keywords: | Blocked By:
Blocking: | Platform: All
-----------------------+-----------------------------
Seen in hrev54131 (2020-05-04).
The ISO C 11 standard, section 7.28, specifies that
- char16_t must be an unsigned type, equivalent to uint_least16_t (defined
in <stdint.h>),
- char32_t must be an unsigned type, equivalent to uint_least32_t (defined
in <stdint.h>).
The attached test program foo.c verifies this. The expected output is:
{{{
char16_t is unsigned? 1
char32_t is unsigned? 1
char16_t is as wide as uint_least16_t? 1
char32_t is as wide as uint_least32_t? 1
}}}
On Haiku/x86_64, different bugs are observed in C and C++ mode.
1) In C mode:
{{{
$ gcc foo.c
$ ./a.out
char16_t is unsigned? 0
char32_t is unsigned? 0
char16_t is as wide as uint_least16_t? 0
char32_t is as wide as uint_least32_t? 0
}}}
2) In C++ mode:
The file does not even compile, due to type conflicts in the inline
functions of <uchar.h>.
{{{
$ gcc -x c++ foo.c
In file included from foo.c:1:
/boot/system/develop/headers/posix/uchar.h: In function 'size_t
mbrtoc16(char16_t*, const char*, size_t, mbstate_t*)':
/boot/system/develop/headers/posix/uchar.h:28:17: error: cannot convert
'char16_t*' to 'wchar_t*'
return mbrtowc(dest, src, srcLength, mbState);
^~~~
In file included from /boot/system/develop/headers/posix/uchar.h:8,
from foo.c:1:
/boot/system/develop/headers/posix/wchar.h:66:33: note: initializing
argument 1 of 'size_t mbrtowc(wchar_t*, const char*, size_t, mbstate_t*)'
extern size_t mbrtowc(wchar_t *dest, const char *src, size_t srcLength,
~~~~~~~~~^~~~
In file included from foo.c:1:
/boot/system/develop/headers/posix/uchar.h: In function 'size_t
mbrtoc32(char32_t*, const char*, size_t, mbstate_t*)':
/boot/system/develop/headers/posix/uchar.h:39:17: error: invalid
conversion from 'char32_t*' to 'wchar_t*' [-fpermissive]
return mbrtowc(dest, src, srcLength, mbState);
^~~~
In file included from /boot/system/develop/headers/posix/uchar.h:8,
from foo.c:1:
/boot/system/develop/headers/posix/wchar.h:66:33: note: initializing
argument 1 of 'size_t mbrtowc(wchar_t*, const char*, size_t, mbstate_t*)'
extern size_t mbrtowc(wchar_t *dest, const char *src, size_t srcLength,
~~~~~~~~~^~~~
}}}
--
Ticket URL: <https://dev.haiku-os.org/ticket/15990>
Haiku <https://dev.haiku-os.org>
The Haiku operating system.
