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