projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 86198885 | 1 | .\" @(#)ungetc.3 6.2 (Berkeley) %G% |
| 1f4480e5 | 2 | .\" |
| 86198885 | 3 | .TH UNGETC 3 "" |
| 1f4480e5 KM |
4 | .AT 3 |
| 5 | .SH NAME | |
| 6 | ungetc \- push character back into input stream | |
| 7 | .SH SYNOPSIS | |
| 8 | .B #include <stdio.h> | |
| 9 | .PP | |
| 10 | .B ungetc(c, stream) | |
| 11 | .br | |
| 12 | .SM | |
| 13 | .B FILE | |
| 14 | .B *stream; | |
| 15 | .SH DESCRIPTION | |
| 16 | .I Ungetc | |
| 17 | pushes the character | |
| 18 | .I c | |
| e3cbff53 | 19 | back on an input stream. That character will be returned by the next |
| 1f4480e5 KM |
20 | .I getc |
| 21 | call on that stream. | |
| 22 | .I Ungetc | |
| 23 | returns | |
| 24 | .IR c . | |
| 25 | .PP | |
| 26 | One character of pushback is guaranteed provided | |
| e3cbff53 | 27 | something has been read from the stream and the stream is actually buffered. |
| 1f4480e5 KM |
28 | Attempts to push EOF are rejected. |
| 29 | .PP | |
| 86198885 | 30 | .IR Fseek (3) |
| 1f4480e5 KM |
31 | erases all memory of pushed back characters. |
| 32 | .SH "SEE ALSO" | |
| 86198885 KB |
33 | getc(3), |
| 34 | setbuf(3), | |
| 35 | fseek(3) | |
| 1f4480e5 KM |
36 | .SH DIAGNOSTICS |
| 37 | .I Ungetc | |
| 38 | returns | |
| 39 | .SM | |
| 40 | .B EOF | |
| 41 | if it can't push a character back. |