Create cpl_string.cpp

/**********************************************************************
 * $Id: cpl_string.cpp,v 1.54 2006/02/19 21:54:34 mloskot Exp $
 *
 * Name:     cpl_string.cpp
 * Project:  CPL - Common Portability Library
 * Purpose:  String and Stringlist manipulation functions.
 * Author:   Daniel Morissette, danmo@videotron.ca
 *
 **********************************************************************
 * Copyright (c) 1998, Daniel Morissette
 *
 * 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.
 **********************************************************************
 *
 * Independent Security Audit 2003/04/04 Andrey Kiselev:
 *   Completed audit of this module. All functions may be used without buffer
 *   overflows and stack corruptions with any kind of input data strings with
 *   except of CPLSPrintf() and CSLAppendPrintf() (see note below).
 * 
 * Security Audit 2003/03/28 warmerda:
 *   Completed security audit.  I believe that this module may be safely used 
 *   to parse tokenize arbitrary input strings, assemble arbitrary sets of
 *   names values into string lists, unescape and escape text even if provided
 *   by a potentially hostile source.   
 *
 *   CPLSPrintf() and CSLAppendPrintf() may not be safely invoked on 
 *   arbitrary length inputs since it has a fixed size output buffer on system 
 *   without vsnprintf(). 
 *
 * $Log: cpl_string.cpp,v $
 * Revision 1.54  2006/02/19 21:54:34  mloskot
 * [WINCE] Changes related to Windows CE port of CPL. Most changes are #ifdef wrappers.
 *
 * Revision 1.53  2005/12/19 20:17:21  fwarmerdam
 * enable pszValue NULL to delete entry in CSLSetNameValue
 *
 * Revision 1.52  2005/12/06 07:33:12  fwarmerdam
 * fixed support for tokenizing string with trailing delimeter, bug 945
 *
 * Revision 1.51  2005/10/13 01:20:16  fwarmerdam
 * added CSLMerge()
 *
 * Revision 1.50  2005/09/30 19:11:40  fwarmerdam
 * fixed hextobinary conversion, bug 935
 *
 * Revision 1.49  2005/09/14 19:21:17  fwarmerdam
 * binary pointer is const in binarytohex
 *
 * Revision 1.48  2005/09/13 15:07:23  dron
 * Initialize counters in CPLHexToBinary().
 *
 * Revision 1.47  2005/09/11 21:09:27  fwarmerdam
 * use large file API in CSLLoad
 *
 * Revision 1.46  2005/09/05 20:19:08  fwarmerdam
 * fixed binarytohex function
 *
 * Revision 1.45  2005/08/31 03:31:15  fwarmerdam
 * added binarytohex/hextobinary
 *
 * Revision 1.44  2005/08/04 19:41:33  fwarmerdam
 * support setting null value in CSLSetNameValue
 *
 * Revision 1.43  2005/05/23 03:59:44  fwarmerdam
 * make cplsprintf buffer threadlocal
 *
 * Revision 1.42  2005/04/04 15:23:31  fwarmerdam
 * some functions now CPL_STDCALL
 *
 * Revision 1.41  2004/09/17 21:26:28  fwarmerdam
 * Yikes ... CPLEscapeString() was badly broken for BackslashEscapable.
 *
 * Revision 1.40  2004/08/16 20:23:46  warmerda
 * added .csv escaping
 *
 * Revision 1.39  2004/07/12 21:50:38  warmerda
 * Added SQL escaping style
 *
 * Revision 1.38  2004/04/23 22:23:32  warmerda
 * Fixed key memory leak in seldom used CSLSetNameValueSeperator().
 *
 * Revision 1.37  2003/12/02 15:56:47  warmerda
 * avoid use of CSLAddString() in tokenize, manage list ourselves
 *
 * Revision 1.36  2003/08/29 17:32:27  warmerda
 * Open file in binary mode for CSLLoad() since CPLReadline() works much
 * better then.
 *
 * Revision 1.35  2003/07/17 10:15:40  dron
 * CSLTestBoolean() added.
 *
 * Revision 1.34  2003/05/28 19:22:38  warmerda
 * fixed docs
 *
 * Revision 1.33  2003/05/21 04:20:30  warmerda
 * avoid warnings
 *
 * Revision 1.32  2003/04/04 14:57:38  dron
 * _vsnprintf() hack moved to the cpl_config.h.vc.
 *
 * Revision 1.31  2003/04/04 14:16:07  dron
 * Use _vsnprintf() in Windows environment.
 *
 * Revision 1.30  2003/03/28 05:29:53  warmerda
 * Fixed buffer overflow risk in escaping code (for XML method).  Avoid
 * use of CPLSPrintf() for name/value list assembly to avoid risk with long
 * key names or values.  Use vsnprintf() in CPLSPrintf() on platforms where it
 * is available.  Security audit complete.
 *
 * Revision 1.29  2003/03/27 21:32:08  warmerda
 * Fixed bug with escaped spaces.
 *
 * Revision 1.28  2003/03/11 21:33:02  warmerda
 * added URL encode/decode support, untested
 *
 * Revision 1.27  2003/01/30 19:15:55  warmerda
 * added some docs
 *
 * Revision 1.26  2003/01/14 14:31:16  warmerda
 * Added "OFF" as a negative response to CSLFetchBoolean().
 *
 * Revision 1.25  2002/10/07 19:35:38  dron
 * Fixed description for CSLFetchBoolean()
 *
 * Revision 1.24  2002/07/12 22:37:05  warmerda
 * added CSLFetchBoolean
 *
 * Revision 1.23  2002/07/09 20:25:25  warmerda
 * expand tabs
 *
 * Revision 1.22  2002/05/28 18:53:43  warmerda
 * added XML escaping support
 *
 * Revision 1.21  2002/04/26 14:55:26  warmerda
 * Added CPLEscapeString() and CPLUnescapeString() (unescape untested)
 *
 * Revision 1.20  2002/03/05 14:26:57  warmerda
 * expanded tabs
 *
 * Revision 1.19  2002/01/16 03:59:27  warmerda
 * added CPLTokenizeString2
 *
 * Revision 1.18  2001/12/11 22:40:26  warmerda
 * cleanup CPLReadLine buffer in CSLLoad()
 *
 * Revision 1.17  2001/11/07 14:31:16  warmerda
 * doc fix
 *
 * Revision 1.16  2001/07/18 04:00:49  warmerda
 * added CPL_CVSID
 *
 * Revision 1.15  2001/01/19 21:16:41  warmerda
 * expanded tabs
 *
 * Revision 1.14  2000/10/06 15:19:03  warmerda
 * added CPLSetNameValueSeparator
 *
 * Revision 1.13  2000/08/22 17:47:50  warmerda
 * Fixed declaration of gnCPLSPrintfBuffer.
 *
 * Revision 1.12  2000/08/18 21:20:54  svillene
 * *** empty log message ***
 *
 * Revision 1.11  2000/03/30 05:38:48  warmerda
 * added CPLParseNameValue
 *
 * Revision 1.10  1999/06/26 14:05:10  warmerda
 * Added CSLFindString().
 *
 * Revision 1.9  1999/04/28 02:33:02  danmo
 * CSLInsertStrings(): make sure papszStrList is NULL-terminated properly
 *
 * Revision 1.8  1999/03/12 21:19:49  danmo
 * Fixed TokenizeStringComplex() vs strings ending with empty token,
 * and fixed a problem with CSLAdd/SetNameValue() vs empty string list.
 *
 * Revision 1.7  1999/03/09 21:29:57  warmerda
 * Added backslash escaping within string constants for tokenize function.
 *
 * Revision 1.6  1999/02/25 04:40:46  danmo
 * Modif. CSLLoad() to use CPLReadLine() (better handling of newlines)
 *
 * Revision 1.5  1999/02/17 01:41:58  warmerda
 * Added CSLGetField
 *
 * Revision 1.4  1998/12/15 19:01:40  warmerda
 * *** empty log message ***
 *
 * Revision 1.3  1998/12/05 23:04:21  warmerda
 * Use EQUALN() instead of strincmp() which doesn't exist on Linux.
 *
 * Revision 1.2  1998/12/04 21:40:42  danmo
 * Added more Name=Value manipulation fuctions
 *
 * Revision 1.1  1998/12/03 18:26:02  warmerda
 * New
 *
 **********************************************************************/