99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/*
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* Copyright (c) 2022-2022 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "vfs_files.h"
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#include "errno.h"
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#include "stdio.h"
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#include "stdlib.h"
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#include "string.h"
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#include "los_config.h"
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#include "vfs_config.h"
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#include "vfs_mount.h"
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#include "vfs_operations.h"
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static struct File g_files[NR_OPEN_DEFAULT];
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int FileToFd(const struct File *file)
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{
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if (file == NULL) {
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return (int)LOS_NOK;
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}
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return file - g_files + MIN_START_FD;
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}
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struct File *FdToFile(int fd)
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{
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if ((fd < MIN_START_FD) || (fd >= CONFIG_NFILE_DESCRIPTORS)) {
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return NULL;
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}
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return &g_files[fd - MIN_START_FD];
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}
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struct File *VfsFileGet(void)
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{
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int i;
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/* protected by g_fsMutex */
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for (i = 0; i < NR_OPEN_DEFAULT; i++) {
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if (g_files[i].fStatus == FILE_STATUS_NOT_USED) {
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g_files[i].fStatus = FILE_STATUS_INITING;
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return &g_files[i];
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}
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}
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return NULL;
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}
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struct File *VfsFileGetSpec(int fd)
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{
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if ((fd < MIN_START_FD) || (fd >= CONFIG_NFILE_DESCRIPTORS)) {
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return NULL;
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}
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if (g_files[fd - MIN_START_FD].fStatus == FILE_STATUS_NOT_USED) {
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g_files[fd - MIN_START_FD].fStatus = FILE_STATUS_INITING;
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return &g_files[fd - MIN_START_FD];
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}
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return NULL;
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}
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void VfsFilePut(struct File *file)
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{
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if (file == NULL) {
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return;
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}
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file->fFlags = 0;
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file->fFops = NULL;
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file->fData = NULL;
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file->fMp = NULL;
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file->fOffset = 0;
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file->fOwner = -1;
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file->fullPath = NULL;
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file->fStatus = FILE_STATUS_NOT_USED;
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}
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