| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /*
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| 2 | Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>
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| 3 | This program and the accompanying materials are licensed and made available
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| 4 | under the terms and conditions of the BSD License that accompanies this
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| 5 | distribution. The full text of the license may be found at
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| 6 | http://opensource.org/licenses/bsd-license.
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| 7 |
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| 8 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 9 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 10 |
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| 11 | * Copyright (c) 1990, 1993
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| 12 | * The Regents of the University of California. All rights reserved.
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| 13 | *
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| 14 | * This code is derived from software contributed to Berkeley by
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| 15 | * Chris Torek.
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| 16 | *
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| 17 | * Redistribution and use in source and binary forms, with or without
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| 18 | * modification, are permitted provided that the following conditions
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| 19 | * are met:
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| 20 | * 1. Redistributions of source code must retain the above copyright
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| 21 | * notice, this list of conditions and the following disclaimer.
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| 22 | * 2. Redistributions in binary form must reproduce the above copyright
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| 23 | * notice, this list of conditions and the following disclaimer in the
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| 24 | * documentation and/or other materials provided with the distribution.
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| 25 | * 3. Neither the name of the University nor the names of its contributors
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| 26 | * may be used to endorse or promote products derived from this software
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| 27 | * without specific prior written permission.
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| 28 | *
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| 29 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 30 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 33 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 34 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 35 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 36 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 38 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 39 | * SUCH DAMAGE.
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| 40 |
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| 41 | NetBSD: refill.c,v 1.13 2003/08/07 16:43:30 agc Exp
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| 42 | refill.c 8.1 (Berkeley) 6/4/93
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| 43 | */
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| 44 | #include <LibConfig.h>
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| 45 | #include <sys/EfiCdefs.h>
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| 46 |
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| 47 | #include <assert.h>
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| 48 | #include <errno.h>
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| 49 | #include <stdio.h>
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| 50 | #include <stdlib.h>
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| 51 | #include "reentrant.h"
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| 52 | #include "local.h"
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| 53 |
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| 54 | #ifdef _REENTRANT
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| 55 | extern rwlock_t __sfp_lock;
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| 56 | #endif
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| 57 |
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| 58 | static int lflush(FILE *);
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| 59 |
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| 60 | static int
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| 61 | lflush(FILE *fp)
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| 62 | {
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| 63 |
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| 64 | _DIAGASSERT(fp != NULL);
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| 65 | if(fp == NULL) {
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| 66 | errno = EINVAL;
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| 67 | return (EOF);
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| 68 | }
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| 69 |
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| 70 | if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
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| 71 | return (__sflush(fp));
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| 72 | return (0);
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| 73 | }
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| 74 |
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| 75 | /*
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| 76 | * Refill a stdio buffer.
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| 77 | * Return EOF on eof or error, 0 otherwise.
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| 78 | */
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| 79 | int
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| 80 | __srefill(FILE *fp)
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| 81 | {
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| 82 |
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| 83 | _DIAGASSERT(fp != NULL);
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| 84 | if(fp == NULL) {
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| 85 | errno = EINVAL;
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| 86 | return (EOF);
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| 87 | }
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| 88 |
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| 89 | /* make sure stdio is set up */
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| 90 | if (!__sdidinit)
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| 91 | __sinit();
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| 92 |
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| 93 | fp->_r = 0; /* largely a convenience for callers */
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| 94 |
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| 95 | /* SysV does not make this test; take it out for compatibility */
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| 96 | if (fp->_flags & __SEOF) {
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| 97 | return (EOF);
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| 98 | }
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| 99 |
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| 100 | /* if not already reading, have to be reading and writing */
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| 101 | if ((fp->_flags & __SRD) == 0) {
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| 102 | if ((fp->_flags & __SRW) == 0) {
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| 103 | errno = EBADF;
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| 104 | fp->_flags |= __SERR; //<dvm> Allows differentiation between errors and EOF
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| 105 | return (EOF);
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| 106 | }
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| 107 | /* switch to reading */
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| 108 | if (fp->_flags & __SWR) {
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| 109 | if (__sflush(fp)) {
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| 110 | return (EOF);
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| 111 | }
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| 112 | fp->_flags &= ~__SWR;
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| 113 | fp->_w = 0;
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| 114 | fp->_lbfsize = 0;
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| 115 | }
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| 116 | fp->_flags |= __SRD;
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| 117 | } else {
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| 118 | /*
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| 119 | * We were reading. If there is an ungetc buffer,
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| 120 | * we must have been reading from that. Drop it,
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| 121 | * restoring the previous buffer (if any). If there
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| 122 | * is anything in that buffer, return.
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| 123 | */
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| 124 | if (HASUB(fp)) {
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| 125 | FREEUB(fp);
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| 126 | if ((fp->_r = fp->_ur) != 0) {
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| 127 | fp->_p = fp->_up;
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| 128 | return (0);
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| 129 | }
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| 130 | }
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| 131 | }
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| 132 |
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| 133 | if (fp->_bf._base == NULL)
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| 134 | __smakebuf(fp);
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| 135 |
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| 136 | /*
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| 137 | * Before reading from a line buffered or unbuffered file,
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| 138 | * flush all line buffered output files, per the ANSI C
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| 139 | * standard.
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| 140 | */
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| 141 | if (fp->_flags & (__SLBF|__SNBF)) {
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| 142 | rwlock_rdlock(&__sfp_lock);
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| 143 | (void) _fwalk(lflush);
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| 144 | rwlock_unlock(&__sfp_lock);
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| 145 | }
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| 146 | fp->_p = fp->_bf._base;
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| 147 | fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);
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| 148 | fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
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| 149 | if (fp->_r <= 0) {
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| 150 | if (fp->_r == 0)
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| 151 | fp->_flags |= __SEOF;
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| 152 | else {
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| 153 | fp->_r = 0;
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| 154 | fp->_flags |= __SERR;
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| 155 | }
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| 156 | return (EOF);
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| 157 | }
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| 158 | return (0);
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| 159 | }
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