cpl_path.cpp

读写ArcInfo Binary Grid的c代码

/**********************************************************************
 * $Id: cpl_path.cpp,v 1.14 2003/05/28 19:22:38 warmerda Exp $
 *
 * Project:  CPL - Common Portability Library
 * Purpose:  Portable filename/path parsing, and forming ala "Glob API".
 * Author:   Frank Warmerdam, [e-mail]
 *
 **********************************************************************
 * Copyright (c) 1999, Frank Warmerdam
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 * DEALINGS IN THE SOFTWARE.
 **********************************************************************
 *
 * $Log: cpl_path.cpp,v $
 * Revision 1.14  2003/05/28 19:22:38  warmerda
 * fixed docs
 *
 * Revision 1.13  2003/04/04 09:11:35  dron
 * strcpy() and strcat() replaced by strncpy() and strncat().
 * A lot of assertion on string sizes added.
 *
 * Revision 1.12  2002/12/13 06:14:17  warmerda
 * fixed bug with IsRelative function
 *
 * Revision 1.11  2002/12/13 06:00:54  warmerda
 * added CPLProjectRelativeFilename() and CPLIsFilenameRelative()
 *
 * Revision 1.10  2002/08/15 09:23:24  dron
 * Added CPLGetDirname() function
 *
 * Revision 1.9  2001/08/30 21:20:49  warmerda
 * expand tabs
 *
 * Revision 1.8  2001/07/18 04:00:49  warmerda
 * added CPL_CVSID
 *
 * Revision 1.7  2001/05/12 19:20:55  warmerda
 * Fixed documentation of CPLGetExtension().
 *
 * Revision 1.6  2001/03/16 22:15:08  warmerda
 * added CPLResetExtension
 *
 * Revision 1.5  2001/02/24 01:53:57  warmerda
 * Added CPLFormCIFilename()
 *
 * Revision 1.4  2001/01/19 21:18:25  warmerda
 * expanded tabs
 *
 * Revision 1.3  2000/01/26 17:53:36  warmerda
 * Fixed CPLGetExtension() for filenames with no extension.
 *
 * Revision 1.2  2000/01/24 19:32:59  warmerda
 * Fixed CPLGetExtension() to not include the dot.
 *
 * Revision 1.1  1999/10/14 19:23:39  warmerda
 * New
 *
 **********************************************************************/

#include "cpl_conv.h"
#include "cpl_string.h"

CPL_CVSID("$Id: cpl_path.cpp,v 1.14 2003/05/28 19:22:38 warmerda Exp $");


/* should be size of larged possible filename */
#define CPL_PATH_BUF_SIZE 2048
static char     szStaticResult[CPL_PATH_BUF_SIZE]; 

#ifdef WIN32        
#define SEP_CHAR '\\'
#define SEP_STRING "\\"
#else
#define SEP_CHAR '/'
#define SEP_STRING "/"
#endif

/************************************************************************/
/*                        CPLFindFilenameStart()                        */
/************************************************************************/

static int CPLFindFilenameStart( const char * pszFilename )

{
    int         iFileStart;

    for( iFileStart = strlen(pszFilename);
         iFileStart > 0
             && pszFilename[iFileStart-1] != '/'
             && pszFilename[iFileStart-1] != '\\';
         iFileStart-- ) {}

    return iFileStart;
}

/************************************************************************/
/*                             CPLGetPath()                             */
/************************************************************************/

/**
 * Extract directory path portion of filename.
 *
 * Returns a string containing the directory path portion of the passed
 * filename.  If there is no path in the passed filename an empty string
 * will be returned (not NULL).
 *
 * <pre>
 * CPLGetPath( "abc/def.xyz" ) == "abc"
 * CPLGetPath( "/abc/def/" ) == "/abc/def"
 * CPLGetPath( "/" ) == "/"
 * CPLGetPath( "/abc/def" ) == "/abc"
 * CPLGetPath( "abc" ) == ""
 * </pre>
 *
 * @param pszFilename the filename potentially including a path.
 *
 *  @return Path in an internal string which must not be freed.  The string
 * may be destroyed by the next CPL filename handling call.  The returned
 * will generally not contain a trailing path separator.
 */

const char *CPLGetPath( const char *pszFilename )

{
    int         iFileStart = CPLFindFilenameStart(pszFilename);

    CPLAssert( iFileStart < CPL_PATH_BUF_SIZE );

    if( iFileStart == 0 )
    {
        strcpy( szStaticResult, "" );
        return szStaticResult;
    }

    strncpy( szStaticResult, pszFilename, iFileStart );
    szStaticResult[iFileStart] = '\0';

    if( iFileStart > 1
        && (szStaticResult[iFileStart-1] == '/'
            || szStaticResult[iFileStart-1] == '\\') )
        szStaticResult[iFileStart-1] = '\0';

    return szStaticResult;
}

/************************************************************************/
/*                             CPLGetDirname()                          */
/************************************************************************/

/**
 * Extract directory path portion of filename.
 *
 * Returns a string containing the directory path portion of the passed
 * filename.  If there is no path in the passed filename the dot will be
 * returned.  It is the only difference from CPLGetPath().
 *
 * <pre>
 * CPLGetDirname( "abc/def.xyz" ) == "abc"
 * CPLGetDirname( "/abc/def/" ) == "/abc/def"
 * CPLGetDirname( "/" ) == "/"
 * CPLGetDirname( "/abc/def" ) == "/abc"
 * CPLGetDirname( "abc" ) == "."
 * </pre>
 *
 * @param pszFilename the filename potentially including a path.
 *
 * @return Path in an internal string which must not be freed.  The string
 * may be destroyed by the next CPL filename handling call.  The returned
 * will generally not contain a trailing path separator.
 */

const char *CPLGetDirname( const char *pszFilename )

{
    int         iFileStart = CPLFindFilenameStart(pszFilename);

    CPLAssert( iFileStart < CPL_PATH_BUF_SIZE );

    if( iFileStart == 0 )
    {
        strcpy( szStaticResult, "." );
        return szStaticResult;
    }

    strncpy( szStaticResult, pszFilename, iFileStart );
    szStaticResult[iFileStart] = '\0';

    if( iFileStart > 1
        && (szStaticResult[iFileStart-1] == '/'
            || szStaticResult[iFileStart-1] == '\\') )
        szStaticResult[iFileStart-1] = '\0';

    return szStaticResult;
}

/************************************************************************/
/*                           CPLGetFilename()                           */
/************************************************************************/

/**
 * Extract non-directory portion of filename.
 *
 * Returns a string containing the bare filename portion of the passed
 * filename.  If there is no filename (passed value ends in trailing directory
 * separator) an empty string is returned.
 *
 * <pre>
 * CPLGetFilename( "abc/def.xyz" ) == "def.xyz"
 * CPLGetFilename( "/abc/def/" ) == ""
 * CPLGetFilename( "abc/def" ) == "def"
 * </pre>
 *
 * @param pszFullFilename the full filename potentially including a path.
 *
 *  @return just the non-directory portion of the path in an internal string
 * which must not be freed.  The string
 * may be destroyed by the next CPL filename handling call.
 */

const char *CPLGetFilename( const char *pszFullFilename )

{
    int iFileStart = CPLFindFilenameStart( pszFullFilename );

    strncpy( szStaticResult, pszFullFilename + iFileStart, CPL_PATH_BUF_SIZE );
    szStaticResult[CPL_PATH_BUF_SIZE - 1] = '\0';

    return szStaticResult;
}

/************************************************************************/
/*                           CPLGetBasename()                           */
/************************************************************************/

/**
 * Extract basename (non-directory, non-extension) portion of filename.
 *
 * Returns a string containing the file basename portion of the passed
 * name.  If there is no basename (passed value ends in trailing directory
 * separator, or filename starts with a dot) an empty string is returned.
 *
 * <pre>
 * CPLGetBasename( "abc/def.xyz" ) == "def"
 * CPLGetBasename( "abc/def" ) == "def"
 * CPLGetBasename( "abc/def/" ) == ""
 * </pre>
 *
 * @param pszFullFilename the full filename potentially including a path.
 *
 * @return just the non-directory, non-extension portion of the path in
 * an internal string which must not be freed.  The string
 * may be destroyed by the next CPL filename handling call.
 */

const char *CPLGetBasename( const char *pszFullFilename )

{
    int iFileStart = CPLFindFilenameStart( pszFullFilename );
    int iExtStart, nLength;

    for( iExtStart = strlen(pszFullFilename);
         iExtStart > iFileStart && pszFullFilename[iExtStart] != '.';
         iExtStart-- ) {}

    if( iExtStart == iFileStart )
        iExtStart = strlen(pszFullFilename);

    nLength = iExtStart - iFileStart;

    CPLAssert( nLength < CPL_PATH_BUF_SIZE );

    strncpy( szStaticResult, pszFullFilename + iFileStart, nLength );
    szStaticResult[nLength] = '\0';

    return szStaticResult;
}


/************************************************************************/
/*                           CPLGetExtension()                          */
/************************************************************************/

/**
 * Extract filename extension from full filename.
 *
 * Returns a string containing the extention portion of the passed
 * name.  If there is no extension (the filename has no dot) an empty string
 * is returned.  The returned extension will not include the period.
 *
 * <pre>
 * CPLGetExtension( "abc/def.xyz" ) == "xyz"
 * CPLGetExtension( "abc/def" ) == ""
 * </pre>
 *
 * @param pszFullFilename the full filename potentially including a path.
 *
 * @return just the extension portion of the path in
 * an internal string which must not be freed.  The string
 * may be destroyed by the next CPL filename handling call.