Manual Reference Pages - UNGETC (3)
- un-get character from input stream
ungetc int c FILE *stream
function pushes the character
(converted to an unsigned char)
back onto the input stream pointed to by
The pushed-back 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
( fseek 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.
The file-position indicator is decremented
by each successful call to
if its value was 0 before a call, its value is unspecified after
function returns the character pushed-back after the conversion,
if the operation fails.
If the value of the argument
the operation will fail and the stream will remain unchanged.
function conforms to
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