1 /* 2 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR> 3 This program and the accompanying materials are licensed and made available 4 under the terms and conditions of the BSD License that accompanies this 5 distribution. The full text of the license may be found at 6 http://opensource.org/licenses/bsd-license. 7 8 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 9 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 10 11 * Copyright (c) 1990, 1993 12 * The Regents of the University of California. All rights reserved. 13 * 14 * This code is derived from software contributed to Berkeley by 15 * Chris Torek. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 3. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 41 NetBSD: fpurge.c,v 1.13 2003/08/07 16:43:24 agc Exp 42 fpurge.c 8.1 (Berkeley) 6/4/93 43 */ 44 #include <LibConfig.h> 45 #include <sys/EfiCdefs.h> 46 47 #include <assert.h> 48 #include <errno.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <wchar.h> 52 #include "reentrant.h" 53 #include "local.h" 54 55 /* 56 * fpurge: like fflush, but without writing anything: leave the 57 * given FILE's buffer empty. 58 */ 59 int 60 fpurge(fp) 61 FILE *fp; 62 { 63 64 _DIAGASSERT(fp != NULL); 65 if(fp == NULL) { 66 errno = EINVAL; 67 return (EOF); 68 } 69 70 if (fp->_flags == 0) { 71 errno = EBADF; 72 return (EOF); 73 } 74 FLOCKFILE(fp); 75 if (HASUB(fp)) 76 FREEUB(fp); 77 WCIO_FREE(fp); 78 fp->_p = fp->_bf._base; 79 fp->_r = 0; 80 fp->_w = fp->_flags & (__SLBF|__SNBF) ? 0 : fp->_bf._size; 81 FUNLOCKFILE(fp); 82 return (0); 83 } 84
