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