@node ungetc
@subsection @code{ungetc}
@findex ungetc

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/ungetc.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
On Windows platforms (excluding Cygwin), this function does not set @code{errno}
upon failure.
@end itemize
