131 lines
4.5 KiB
C
131 lines
4.5 KiB
C
/****************************************************************************
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* lib/lib_getcwd.c
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written 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
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <nuttx/config.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "lib_internal.h"
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#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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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: getwcd
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*
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* Description:
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* getcwd() function places the absolute pathname of the current working
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* directory in the array pointed to by 'buf', and returns 'buf.' The
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* pathname copied to the array shall contain no components that are
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* symbolic links. The 'size' argument is the size in bytes of the
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* character array pointed to by the 'buf' argument.
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*
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* Input Parmeters:
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* buf - a pointer to the location in which the current working directory
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* pathaname is returned.
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* size - The size in bytes avaiable at 'buf'
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*
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* Returned Value:
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* Upon successful completion, getcwd() returns the 'buf' argument.
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* Otherwise, getcwd() returns a null pointer and sets errno to indicate
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* the error:
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*
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* EINVAL
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* The 'size' argument is 0 or the 'buf' argument is NULL.
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* ERANGE
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* The size argument is greater than 0, but is smaller than the length
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* of the currrent working directory pathname +1.
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* EACCES
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* Read or search permission was denied for a component of the pathname.
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* ENOMEM
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* Insufficient storage space is available.
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*
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****************************************************************************/
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FAR char *getcwd(FAR char *buf, size_t size)
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{
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char *pwd;
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/* Verify input parameters */
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if (!buf || !size)
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{
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errno = EINVAL;
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return NULL;
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}
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/* If no working directory is defined, then default to the home directory */
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pwd = getenv("PWD");
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if (!pwd)
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{
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pwd = CONFIG_LIB_HOMEDIR;
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}
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/* Verify that the cwd will fit into the user-provided buffer */
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if (strlen(pwd) + 1 > size)
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{
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errno = ERANGE;
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return NULL;
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}
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/* Copy the cwd to the user buffer */
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strcpy(buf, pwd);
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sched_unlock();
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return buf;
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}
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#endif /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_DISABLE_ENVIRON */
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