10.72.31 towupper ¶
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/towupper.html
Gnulib module: wctype-h
Portability problems fixed by Gnulib:
- This function returns values of which the upper 16 bits are incorrect
on some platforms:
mingw.
- This function cannot be called from plain inline or extern inline functions
on some platforms:
macOS 10.8.
Portability problems not fixed by Gnulib:
- On Windows and 32-bit AIX platforms,
wchar_t is a 16-bit type and therefore cannot
accommodate all Unicode characters.
However, the Gnulib function c32toupper, provided by Gnulib module
c32toupper, operates on 32-bit wide characters and therefore does not
have this limitation.
- On native Windows, in an UTF-8 locale, this function does not even do
the simple expected mappings, such as from 0x00E9 to 0x00C9.
- This function returns wrong values even for the ASCII characters
in a zh_CN.GB18030 locale on some platforms:
NetBSD 10.0.