|UNGETC(3)||Library Functions Manual||UNGETC(3)|
ungetc — un-get
character from input stream
ungetc() function pushes the character
c (converted to an unsigned char) back onto the input
stream pointed to by stream. The pushed-backed
characters will be returned by subsequent reads on the stream (in reverse
order). A successful intervening call, using the same stream, to one of the
file positioning functions
rewind(3)) will discard the
pushed back characters.
One character of push-back is guaranteed, but as long as there is sufficient memory, an effectively infinite amount of pushback is allowed.
If a character is successfully pushed-back, the end-of-file indicator for the stream is cleared.
ungetc() function returns the
character pushed-back after the conversion, or
if the operation fails. If the value of the argument c
EOF, the operation will fail and
the stream will remain unchanged.
ungetc() function conforms to
ANSI X3.159-1989 (“ANSI C89”)
and IEEE Std 1003.1-2001
ungetc() function appeared in
Version 7 AT&T UNIX.
|April 30, 2010||NetBSD-7.0.1|