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Diffstat (limited to 'nuttx/lib/dirent/lib_readdirr.c')
-rw-r--r-- | nuttx/lib/dirent/lib_readdirr.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/nuttx/lib/dirent/lib_readdirr.c b/nuttx/lib/dirent/lib_readdirr.c new file mode 100644 index 000000000..47c5b9a7b --- /dev/null +++ b/nuttx/lib/dirent/lib_readdirr.c @@ -0,0 +1,122 @@ +/**************************************************************************** + * lib/dirent/lib_readdirr.c + * + * Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 NuttX 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 OWNER 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <string.h> +#include <dirent.h> +#include <errno.h> + +#include <nuttx/fs/fs.h> + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: readdir_r + * + * Description: + * The readdir() function returns a pointer to a dirent + * structure representing the next directory entry in the + * directory stream pointed to by dir. It returns NULL on + * reaching the end-of-file or if an error occurred. + * + * Inputs: + * dirp -- An instance of type DIR created by a previous + * call to opendir(); + * entry -- The storage pointed to by entry must be large + * enough for a dirent with an array of char d_name + * members containing at least {NAME_MAX}+1 elements. + * result -- Upon successful return, the pointer returned + * at *result shall have the same value as the + * argument entry. Upon reaching the end of the directory + * stream, this pointer shall have the value NULL. + * + * Return: + * If successful, the readdir_r() function return s zero; + * otherwise, an error number is returned to indicate the + * error. + * + * EBADF - Invalid directory stream descriptor dir + * + ****************************************************************************/ + +int readdir_r(FAR DIR *dirp, FAR struct dirent *entry, + FAR struct dirent **result) +{ + struct dirent *tmp; + + /* NOTE: The following use or errno is *not* thread-safe */ + + set_errno(0); + tmp = readdir(dirp); + if (!tmp) + { + int error = get_errno(); + if (!error) + { + if (result) + { + *result = NULL; + } + return 0; + } + else + { + return error; + } + } + + if (entry) + { + memcpy(entry, tmp, sizeof(struct dirent)); + } + + if (result) + { + *result = entry; + } + return 0; +} + |