76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
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/****************************************************************************
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* libs/libc/dirent/lib_readdir.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <dirent.h>
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#include <errno.h>
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#include <unistd.h>
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: readdir
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*
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* Description:
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* The readdir() function returns a pointer to a dirent structure
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* representing the next directory entry in the directory stream pointed
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* to by dir. It returns NULL on reaching the end-of-file or if an error
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* occurred.
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*
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* Input Parameters:
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* dirp -- An instance of type DIR created by a previous call to opendir();
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*
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* Returned Value:
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* The readdir() function returns a pointer to a dirent structure, or NULL
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* if an error occurs or end-of-file is reached. On error, errno is set
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* appropriately.
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*
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* EBADF - Invalid directory stream descriptor dir
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*
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****************************************************************************/
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FAR struct dirent *readdir(DIR *dirp)
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{
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int ret;
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if (!dirp)
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{
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set_errno(EBADF);
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return NULL;
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}
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ret = read(dirp->fd, &dirp->entry, sizeof(struct dirent));
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if (ret <= 0)
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{
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return NULL;
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}
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return &dirp->entry;
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}
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