122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 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 <unistd.h>
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#include <sys/types.h>
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#include <dirent.h>
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#ifdef LOSCFG_FS_VFS
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#include <fs/fs.h>
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off_t _lseek(int fd, off_t offset, int whence)
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{
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int ret;
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struct file *filep = NULL;
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/* Get the file structure corresponding to the file descriptor. */
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ret = fs_getfilep(fd, &filep);
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if (ret < 0) {
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/* The errno value has already been set */
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return (off_t)-get_errno();
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}
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/* libc seekdir function should set the whence to SEEK_SET, so we can discard
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* the whence argument here */
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if (filep->f_oflags & O_DIRECTORY) {
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/* defensive coding */
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if (filep->f_dir == NULL) {
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return (off_t)-EINVAL;
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}
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if (offset == 0) {
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rewinddir(filep->f_dir);
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} else {
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seekdir(filep->f_dir, offset);
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}
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ret = telldir(filep->f_dir);
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if (ret < 0) {
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return (off_t)-get_errno();
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}
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return ret;
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}
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/* Then let file_seek do the real work */
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ret = file_seek(filep, offset, whence);
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if (ret < 0) {
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return -get_errno();
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}
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return ret;
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}
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off64_t _lseek64(int fd, int offsetHigh, int offsetLow, off64_t *result, int whence)
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{
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off64_t ret;
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struct file *filep = NULL;
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off64_t offset = ((off64_t)offsetHigh << 32) + (uint)offsetLow; /* 32: offsetHigh is high 32 bits */
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/* Get the file structure corresponding to the file descriptor. */
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ret = fs_getfilep(fd, &filep);
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if (ret < 0) {
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/* The errno value has already been set */
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return (off64_t)-get_errno();
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}
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/* libc seekdir function should set the whence to SEEK_SET, so we can discard
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* the whence argument here */
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if (filep->f_oflags & O_DIRECTORY) {
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/* defensive coding */
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if (filep->f_dir == NULL) {
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return (off64_t)-EINVAL;
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}
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if (offsetLow == 0) {
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rewinddir(filep->f_dir);
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} else {
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seekdir(filep->f_dir, offsetLow);
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}
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ret = telldir(filep->f_dir);
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if (ret < 0) {
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return (off64_t)-get_errno();
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}
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goto out;
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}
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/* Then let file_seek do the real work */
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ret = file_seek64(filep, offset, whence);
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if (ret < 0) {
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return (off64_t)-get_errno();
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}
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out:
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*result = ret;
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return 0;
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}
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#endif
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