UNGETC(3) Library Routines UNGETC(3)
ungetc - un-get character from input stream
int ungetc (int c, FILE *stream);
The 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 fseek(3), fsetpos(3),
or rewind(3) will discard the pushed back characters.
One character of push-back is guaranteed, but as long as there is suf-
ficient 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 ungetc function returns the character pushed-back after the conver-
sion, or EOF if the operation fails. If the value of the argument c
character equals EOF, the operation will fail and the stream will
getc(3), fseek(3), setvbuf(3)
The ungetc function conforms to ANSI/C.
GNO 15 September 1997 UNGETC(3)
Man(1) output converted with