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@node toupper
@section @code{toupper}
@findex toupper
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/toupper.html}
Gnulib module: ctype
Portability problems fixed by Gnulib:
@itemize
@item
This function cannot be called from plain inline or extern inline functions
on some platforms:
OS X 10.8.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
accommodate all Unicode characters.
@end itemize
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