NAME
ungetc - push character back into input stream
SYNOPSIS
#include <stdio_p.h>
int ungetc (c, stream)
char c;
FILE *stream;
DESCRIPTION
ungetc
pushes the character
c
back on an input stream. That character will be returned by the next
getc
call on that stream.
ungetc
returns
c.
One character of pushback is guaranteed provided something has been
read from the stream and the stream is actually buffered. Attempts to
push EOF are rejected.
fseek(3P)
erases all memory of pushed back characters.
SEE ALSO
fseek(3P)
,
getc(3P)
,
setbuf(3P).
DIAGNOSTICS
ungetc
returns EOF if it can't push a character back.