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+.TH UNGETC 3S
+.CT 2 file_io
+.SH NAME
+ungetc \(mi push character back into input stream
+.SH SYNOPSIS
+.B #include <stdio.h>
+.PP
+.B ungetc(c, stream)
+.br
+.SM
+.B FILE
+.B *stream;
+.SH DESCRIPTION
+.I Ungetc
+pushes the character
+.I c
+back on an input stream.
+That character will be returned by the next
+.I getc
+call on that stream.
+.I Ungetc
+returns
+.IR c .
+.PP
+One character of pushback is guaranteed provided
+something has been read from the stream and the stream is
+actually buffered.
+Attempts to push
+.B EOF
+are rejected.
+.SH "SEE ALSO"
+.IR getc (3), 
+.IR stdio (3), 
+.IR fseek (3)
+.SH DIAGNOSTICS
+.I Ungetc
+returns
+.B EOF
+if it can't push a character back.