You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
132 lines
4.6 KiB
132 lines
4.6 KiB
/**************************************************************************** |
|
* lib/unistd/lib_getcwd.c |
|
* |
|
* Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved. |
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr> |
|
* |
|
* 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 <sys/types.h> |
|
#include <stdlib.h> |
|
#include <string.h> |
|
#include <unistd.h> |
|
#include <errno.h> |
|
|
|
#include "lib_internal.h" |
|
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON) |
|
|
|
/**************************************************************************** |
|
* Definitions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Public Variables |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Public Functions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Name: getwcd |
|
* |
|
* Description: |
|
* getcwd() function places the absolute pathname of the current working |
|
* directory in the array pointed to by 'buf', and returns 'buf.' The |
|
* pathname copied to the array shall contain no components that are |
|
* symbolic links. The 'size' argument is the size in bytes of the |
|
* character array pointed to by the 'buf' argument. |
|
* |
|
* Input Parmeters: |
|
* buf - a pointer to the location in which the current working directory |
|
* pathaname is returned. |
|
* size - The size in bytes avaiable at 'buf' |
|
* |
|
* Returned Value: |
|
* Upon successful completion, getcwd() returns the 'buf' argument. |
|
* Otherwise, getcwd() returns a null pointer and sets errno to indicate |
|
* the error: |
|
* |
|
* EINVAL |
|
* The 'size' argument is 0 or the 'buf' argument is NULL. |
|
* ERANGE |
|
* The size argument is greater than 0, but is smaller than the length |
|
* of the currrent working directory pathname +1. |
|
* EACCES |
|
* Read or search permission was denied for a component of the pathname. |
|
* ENOMEM |
|
* Insufficient storage space is available. |
|
* |
|
****************************************************************************/ |
|
|
|
FAR char *getcwd(FAR char *buf, size_t size) |
|
{ |
|
char *pwd; |
|
|
|
/* Verify input parameters */ |
|
|
|
#ifdef CONFIG_DEBUG |
|
if (!buf || !size) |
|
{ |
|
set_errno(EINVAL); |
|
return NULL; |
|
} |
|
#endif |
|
|
|
/* If no working directory is defined, then default to the home directory */ |
|
|
|
pwd = getenv("PWD"); |
|
if (!pwd) |
|
{ |
|
pwd = CONFIG_LIB_HOMEDIR; |
|
} |
|
|
|
/* Verify that the cwd will fit into the user-provided buffer */ |
|
|
|
if (strlen(pwd) + 1 > size) |
|
{ |
|
set_errno(ERANGE); |
|
return NULL; |
|
} |
|
|
|
/* Copy the cwd to the user buffer */ |
|
|
|
strcpy(buf, pwd); |
|
sched_unlock(); |
|
return buf; |
|
} |
|
#endif /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_DISABLE_ENVIRON */
|
|
|