@node _toupper
@section @code{_toupper}
@findex _toupper

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/_toupper.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
macOS 11.1, Minix 3.1.8, Android 4.4.
@end itemize