150 lines
4.8 KiB
C
150 lines
4.8 KiB
C
/****************************************************************************
|
|
* lib_dirname.c
|
|
*
|
|
* Copyright (C) 2007 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 Gregory Nutt 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Compilation Switches
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <string.h>
|
|
#include <libgen.h>
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
static char g_retchar[2];
|
|
|
|
/****************************************************************************
|
|
* Global Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: dirname
|
|
*
|
|
* Description:
|
|
* dirname() extracts the directory component from a null-terminated
|
|
* pathname string. In the usual case, dirname() returns the string up
|
|
* to, but not including, the final '/'. Trailing '/' characters are not
|
|
* counted as part of the pathname.
|
|
*
|
|
* If path does not contain a slash, dirname() returns the string ".". If
|
|
* path is the string "/", then dirname() returns the string "/". If path
|
|
* is a NULL pointer or points to an empty string, then dirname() returns
|
|
* the string ".".
|
|
*
|
|
* dirname() may modify the contents of path, so copies should be passed.
|
|
* dirname() may return pointers to statically allocated memory which may
|
|
* be overwritten by subsequent calls.
|
|
*
|
|
* Parameter:
|
|
* path The null-terminated string referring to the path to be decomposed
|
|
*
|
|
* Return:
|
|
* On success the directory component of the path is returned.
|
|
*
|
|
****************************************************************************/
|
|
|
|
char *dirname(char *path)
|
|
{
|
|
char *p;
|
|
int len;
|
|
int ch;
|
|
|
|
/* Handle some corner cases */
|
|
|
|
if (!path || *path == '\0')
|
|
{
|
|
ch = '.';
|
|
goto out_retchar;
|
|
}
|
|
|
|
/* Check for trailing slash characters */
|
|
|
|
len = strlen(path);
|
|
while (path[len-1] == '/')
|
|
{
|
|
/* Remove trailing '/' UNLESS this would make a zero length string */
|
|
if (len > 1)
|
|
{
|
|
path[len-1] = '\0';
|
|
len--;
|
|
}
|
|
else
|
|
{
|
|
ch = '/';
|
|
goto out_retchar;
|
|
}
|
|
}
|
|
|
|
/* Get the address of the last '/' which is not at the end of the path and,
|
|
* therefor, must be the end of the directory component.
|
|
*/
|
|
|
|
p = strrchr(path, '/');
|
|
if (p)
|
|
{
|
|
/* Handle the case where the only '/' in the string is the at the beginning
|
|
* of the path.
|
|
*/
|
|
|
|
if (p == path)
|
|
{
|
|
ch = '/';
|
|
goto out_retchar;
|
|
}
|
|
|
|
/* No, the directory component is the substring before the '/'. */
|
|
|
|
*p = '\0';
|
|
return path;
|
|
}
|
|
|
|
/* There is no '/' in the path */
|
|
|
|
ch = '.';
|
|
|
|
out_retchar:
|
|
g_retchar[0] = ch;
|
|
g_retchar[1] = '\0';
|
|
return g_retchar;
|
|
}
|