99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
|
/*
|
||
|
|
* 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;
|
||
|
|
}
|