projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5b2abdfb | 1 | /*- |
| e9ce8d39 A |
2 | * Copyright (c) 1990, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * Chris Torek. | |
| 7 | * | |
| 8 | * Redistribution and use in source and binary forms, with or without | |
| 9 | * modification, are permitted provided that the following conditions | |
| 10 | * are met: | |
| 11 | * 1. Redistributions of source code must retain the above copyright | |
| 12 | * notice, this list of conditions and the following disclaimer. | |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 14 | * notice, this list of conditions and the following disclaimer in the | |
| 15 | * documentation and/or other materials provided with the distribution. | |
| e9ce8d39 A |
16 | * 4. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software | |
| 18 | * without specific prior written permission. | |
| 19 | * | |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 30 | * SUCH DAMAGE. | |
| 31 | */ | |
| 32 | ||
| 33 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 9385eb3d | 34 | static char sccsid[] = "@(#)fpurge.c 8.1 (Berkeley) 6/4/93"; |
| e9ce8d39 | 35 | #endif /* LIBC_SCCS and not lint */ |
| 9385eb3d | 36 | #include <sys/cdefs.h> |
| 1f2f436a | 37 | __FBSDID("$FreeBSD: src/lib/libc/stdio/fpurge.c,v 1.11 2007/01/09 00:28:06 imp Exp $"); |
| e9ce8d39 | 38 | |
| 9385eb3d A |
39 | #include "namespace.h" |
| 40 | #include <errno.h> | |
| e9ce8d39 | 41 | #include <stdio.h> |
| 9385eb3d A |
42 | #include <stdlib.h> |
| 43 | #include "un-namespace.h" | |
| 44 | #include "local.h" | |
| 45 | #include "libc_private.h" | |
| e9ce8d39 | 46 | |
| 9385eb3d A |
47 | /* |
| 48 | * fpurge: like fflush, but without writing anything: leave the | |
| 49 | * given FILE's buffer empty. | |
| 50 | */ | |
| e9ce8d39 | 51 | int |
| 9385eb3d A |
52 | fpurge(fp) |
| 53 | FILE *fp; | |
| e9ce8d39 | 54 | { |
| 9385eb3d A |
55 | int retval; |
| 56 | FLOCKFILE(fp); | |
| 57 | if (!fp->_flags) { | |
| 58 | errno = EBADF; | |
| 59 | retval = EOF; | |
| 60 | } else { | |
| 61 | if (HASUB(fp)) | |
| 62 | FREEUB(fp); | |
| 63 | fp->_p = fp->_bf._base; | |
| 64 | fp->_r = 0; | |
| 65 | fp->_w = fp->_flags & (__SLBF|__SNBF) ? 0 : fp->_bf._size; | |
| 66 | retval = 0; | |
| 67 | } | |
| 68 | FUNLOCKFILE(fp); | |
| 69 | return (retval); | |
| e9ce8d39 | 70 | } |