cpl_string.h

Go to the documentation of this file.

/**********************************************************************
 * $Id$
 *
 * Name:     cpl_string.h
 * Project:  CPL - Common Portability Library
 * Purpose:  String and StringList functions.
 * Author:   Daniel Morissette, dmorissette@mapgears.com
 *
 **********************************************************************
 * Copyright (c) 1998, Daniel Morissette
 * Copyright (c) 2008-2014, Even Rouault <even dot rouault at spatialys.com>
 *
 * 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.
 ****************************************************************************/
 
#ifndef CPL_STRING_H_INCLUDED
#define CPL_STRING_H_INCLUDED
 
#include "cpl_error.h"
#include "cpl_conv.h"
#include "cpl_vsi.h"
 
#include <stdbool.h>
 
CPL_C_START
 
char CPL_DLL **CSLAddString(char **papszStrList,
                            const char *pszNewString) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLAddStringMayFail(
    char **papszStrList, const char *pszNewString) CPL_WARN_UNUSED_RESULT;
int CPL_DLL CSLCount(CSLConstList papszStrList);
const char CPL_DLL *CSLGetField( CSLConstList, int );
void CPL_DLL CPL_STDCALL CSLDestroy(char **papszStrList);
char CPL_DLL **CSLDuplicate(CSLConstList papszStrList) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLMerge( char **papszOrig,
                         CSLConstList papszOverride ) CPL_WARN_UNUSED_RESULT;
 
char CPL_DLL **CSLTokenizeString(const char *pszString ) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLTokenizeStringComplex(
    const char *pszString, const char *pszDelimiter, int bHonourStrings,
    int bAllowEmptyTokens ) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLTokenizeString2( const char *pszString,
                                   const char *pszDelimiter,
                                   int nCSLTFlags ) CPL_WARN_UNUSED_RESULT;
 
#define CSLT_HONOURSTRINGS      0x0001
#define CSLT_ALLOWEMPTYTOKENS   0x0002
#define CSLT_PRESERVEQUOTES     0x0004
#define CSLT_PRESERVEESCAPES    0x0008
#define CSLT_STRIPLEADSPACES    0x0010
#define CSLT_STRIPENDSPACES     0x0020
 
int CPL_DLL CSLPrint(CSLConstList papszStrList, FILE *fpOut);
char CPL_DLL **CSLLoad(const char *pszFname) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLLoad2(
    const char *pszFname, int nMaxLines, int nMaxCols,
    CSLConstList papszOptions) CPL_WARN_UNUSED_RESULT;
int CPL_DLL CSLSave(CSLConstList papszStrList, const char *pszFname);
 
char CPL_DLL **CSLInsertStrings(char **papszStrList, int nInsertAtLineNo,
                        CSLConstList papszNewLines) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLInsertString(char **papszStrList, int nInsertAtLineNo,
                               const char *pszNewLine) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLRemoveStrings(
    char **papszStrList, int nFirstLineToDelete,
    int nNumToRemove, char ***ppapszRetStrings) CPL_WARN_UNUSED_RESULT;
int CPL_DLL CSLFindString( CSLConstList papszList, const char *pszTarget );
int CPL_DLL CSLFindStringCaseSensitive( CSLConstList papszList,
                                        const char *pszTarget );
int CPL_DLL CSLPartialFindString( CSLConstList papszHaystack,
                                  const char *pszNeedle );
int CPL_DLL CSLFindName(CSLConstList papszStrList, const char *pszName);
int CPL_DLL CSLFetchBoolean( CSLConstList papszStrList, const char *pszKey,
                             int bDefault );
 
/* TODO: Deprecate CSLTestBoolean.  Remove in GDAL 3.x. */
int CPL_DLL CSLTestBoolean( const char *pszValue );
/* Do not use CPLTestBoolean in C++ code.  Use CPLTestBool. */
int CPL_DLL CPLTestBoolean( const char *pszValue );
 
bool CPL_DLL CPLTestBool( const char *pszValue );
bool CPL_DLL CPLFetchBool( CSLConstList papszStrList, const char *pszKey,
                           bool bDefault );
 
const char CPL_DLL *
      CPLParseNameValue( const char *pszNameValue, char **ppszKey );
 
const char CPL_DLL *
      CSLFetchNameValue( CSLConstList papszStrList, const char *pszName);
const char CPL_DLL *
      CSLFetchNameValueDef( CSLConstList papszStrList,
                            const char *pszName,
                            const char *pszDefault );
char CPL_DLL **
      CSLFetchNameValueMultiple(CSLConstList papszStrList, const char *pszName);
char CPL_DLL **
      CSLAddNameValue(char **papszStrList,
                      const char *pszName,
                      const char *pszValue) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **
      CSLSetNameValue(char **papszStrList,
                      const char *pszName,
                      const char *pszValue) CPL_WARN_UNUSED_RESULT;
void CPL_DLL CSLSetNameValueSeparator( char ** papszStrList,
                                       const char *pszSeparator );
 
char CPL_DLL ** CSLParseCommandLine(const char* pszCommandLine);
 
#define CPLES_BackslashQuotable 0
#define CPLES_XML               1
#define CPLES_URL               2
#define CPLES_SQL               3
#define CPLES_CSV               4
#define CPLES_XML_BUT_QUOTES    5
#define CPLES_CSV_FORCE_QUOTING 6
#define CPLES_SQLI              7
 
char CPL_DLL *CPLEscapeString( const char *pszString, int nLength,
                               int nScheme ) CPL_WARN_UNUSED_RESULT;
char CPL_DLL *CPLUnescapeString( const char *pszString, int *pnLength,
                                 int nScheme ) CPL_WARN_UNUSED_RESULT;
 
char CPL_DLL *CPLBinaryToHex( int nBytes,
                              const GByte *pabyData ) CPL_WARN_UNUSED_RESULT;
GByte CPL_DLL *CPLHexToBinary( const char *pszHex,
                               int *pnBytes ) CPL_WARN_UNUSED_RESULT;
 
char CPL_DLL *CPLBase64Encode( int nBytes,
                               const GByte *pabyData ) CPL_WARN_UNUSED_RESULT;
int CPL_DLL CPLBase64DecodeInPlace( GByte* pszBase64 ) CPL_WARN_UNUSED_RESULT;
 
typedef enum
{
    CPL_VALUE_STRING,  
    CPL_VALUE_REAL,    
    CPL_VALUE_INTEGER  
} CPLValueType;
 
CPLValueType CPL_DLL CPLGetValueType(const char* pszValue);
 
size_t CPL_DLL CPLStrlcpy(char* pszDest, const char* pszSrc, size_t nDestSize);
size_t CPL_DLL CPLStrlcat(char* pszDest, const char* pszSrc, size_t nDestSize);
size_t CPL_DLL CPLStrnlen(const char *pszStr, size_t nMaxLen);
 
/* -------------------------------------------------------------------- */
/*      Locale independent formatting functions.                        */
/* -------------------------------------------------------------------- */
int CPL_DLL CPLvsnprintf( char *str, size_t size,
                          CPL_FORMAT_STRING(const char* fmt),
                          va_list args )
    CPL_PRINT_FUNC_FORMAT(3, 0 );
 
/* ALIAS_CPLSNPRINTF_AS_SNPRINTF might be defined to enable GCC 7 */
/* -Wformat-truncation= warnings, but shouldn't be set for normal use */
#if defined(ALIAS_CPLSNPRINTF_AS_SNPRINTF)
#define CPLsnprintf snprintf
#else
int CPL_DLL CPLsnprintf( char *str, size_t size,
                         CPL_FORMAT_STRING(const char* fmt), ... )
    CPL_PRINT_FUNC_FORMAT(3, 4);
#endif
 
#if defined(GDAL_COMPILATION) && !defined(DONT_DEPRECATE_SPRINTF)
int CPL_DLL CPLsprintf( char *str, CPL_FORMAT_STRING(const char* fmt), ... )
    CPL_PRINT_FUNC_FORMAT(2, 3)
    CPL_WARN_DEPRECATED("Use CPLsnprintf instead");
#else
int CPL_DLL CPLsprintf( char *str, CPL_FORMAT_STRING(const char* fmt), ... )
    CPL_PRINT_FUNC_FORMAT(2, 3);
#endif
int CPL_DLL CPLprintf( CPL_FORMAT_STRING(const char* fmt), ... )
    CPL_PRINT_FUNC_FORMAT(1, 2);
 
/* For some reason Doxygen_Suppress is needed to avoid warning. Not sure why */
/* caution: only works with limited number of formats */
int CPL_DLL CPLsscanf( const char* str,
                       CPL_SCANF_FORMAT_STRING(const char* fmt), ... )
    CPL_SCAN_FUNC_FORMAT(2, 3);
const char CPL_DLL *CPLSPrintf( CPL_FORMAT_STRING(const char *fmt), ... )
    CPL_PRINT_FUNC_FORMAT(1, 2) CPL_WARN_UNUSED_RESULT;
char CPL_DLL **CSLAppendPrintf( char **papszStrList,
                                CPL_FORMAT_STRING(const char *fmt), ... )
    CPL_PRINT_FUNC_FORMAT(2, 3) CPL_WARN_UNUSED_RESULT;
int CPL_DLL CPLVASPrintf( char **buf,
                          CPL_FORMAT_STRING(const char *fmt), va_list args )
    CPL_PRINT_FUNC_FORMAT(2, 0);
 
/* -------------------------------------------------------------------- */
/*      RFC 23 character set conversion/recoding API (cpl_recode.cpp).  */
/* -------------------------------------------------------------------- */
#define CPL_ENC_LOCALE     ""
#define CPL_ENC_UTF8       "UTF-8"
#define CPL_ENC_UTF16      "UTF-16"
#define CPL_ENC_UCS2       "UCS-2"
#define CPL_ENC_UCS4       "UCS-4"
#define CPL_ENC_ASCII      "ASCII"
#define CPL_ENC_ISO8859_1  "ISO-8859-1"
 
int CPL_DLL  CPLEncodingCharSize( const char *pszEncoding );
void CPL_DLL  CPLClearRecodeWarningFlags( void );
char CPL_DLL *CPLRecode(
    const char *pszSource, const char *pszSrcEncoding,
    const char *pszDstEncoding ) CPL_WARN_UNUSED_RESULT CPL_RETURNS_NONNULL;
char CPL_DLL *CPLRecodeFromWChar(
    const wchar_t *pwszSource, const char *pszSrcEncoding,
    const char *pszDstEncoding ) CPL_WARN_UNUSED_RESULT;
wchar_t CPL_DLL *CPLRecodeToWChar(
    const char *pszSource, const char *pszSrcEncoding,
    const char *pszDstEncoding ) CPL_WARN_UNUSED_RESULT;
int CPL_DLL CPLIsUTF8( const char* pabyData, int nLen );
char CPL_DLL *CPLForceToASCII(
    const char* pabyData, int nLen,
    char chReplacementChar ) CPL_WARN_UNUSED_RESULT;
int CPL_DLL CPLStrlenUTF8( const char *pszUTF8Str );
int CPL_DLL CPLCanRecode(
    const char *pszTestStr, const char *pszSrcEncoding,
    const char *pszDstEncoding) CPL_WARN_UNUSED_RESULT;
CPL_C_END
 
/************************************************************************/
/*                              CPLString                               */
/************************************************************************/
 
#if defined(__cplusplus) && !defined(CPL_SUPRESS_CPLUSPLUS)
 
extern "C++"
{
#ifndef DOXYGEN_SKIP
#include <string>
#endif
 
// VC++ implicitly applies __declspec(dllexport) to template base classes
// of classes marked with __declspec(dllexport).
// Hence, if marked with CPL_DLL, VC++ would export symbols for the specialization
// of std::basic_string<char>, since it is a base class of CPLString.
// As a result, if an application linked both gdal.dll and a static library that
// (implicitly) instantiates std::string (almost all do!), then the linker would
// emit an error concerning duplicate symbols for std::string.
// The least intrusive solution is to not mark the whole class with
// __declspec(dllexport) for VC++, but only its non-inline methods.
#ifdef _MSC_VER
#  define CPLSTRING_CLASS_DLL
#  define CPLSTRING_METHOD_DLL CPL_DLL
#else
#  define CPLSTRING_CLASS_DLL CPL_DLL
#  define CPLSTRING_METHOD_DLL
#endif
 
class CPLSTRING_CLASS_DLL CPLString : public std::string
{
public:
 
    CPLString(void) {}
    // cppcheck-suppress noExplicitConstructor
    CPLString( const std::string &oStr ) : std::string( oStr ) {}
    // cppcheck-suppress noExplicitConstructor
    CPLString( const char *pszStr ) : std::string( pszStr ) {}
    CPLString( const char *pszStr, size_t n ) : std::string( pszStr, n ) {}
 
    operator const char* (void) const { return c_str(); }
 
    char& operator[](std::string::size_type i)
    {
        return std::string::operator[](i);
    }
 
    const char& operator[](std::string::size_type i) const
    {
        return std::string::operator[](i);
    }
 
    char& operator[](int i)
    {
        return std::string::operator[](
            static_cast<std::string::size_type>(i));
    }
 
    const char& operator[](int i) const
    {
        return std::string::operator[](
            static_cast<std::string::size_type>(i));
    }
 
    void Clear() { resize(0); }
 
    void Seize( char *pszValue )
    {
        if (pszValue == nullptr )
            Clear();
        else
        {
            *this = pszValue;
            CPLFree(pszValue);
        }
    }
 
    /* There seems to be a bug in the way the compiler count indices...
     * Should be CPL_PRINT_FUNC_FORMAT (1, 2) */
    CPLSTRING_METHOD_DLL CPLString &Printf(
        CPL_FORMAT_STRING(const char *pszFormat), ... )
        CPL_PRINT_FUNC_FORMAT (2, 3);
    CPLSTRING_METHOD_DLL CPLString &vPrintf(
        CPL_FORMAT_STRING(const char *pszFormat), va_list args )
        CPL_PRINT_FUNC_FORMAT(2, 0);
    CPLSTRING_METHOD_DLL CPLString &FormatC( double dfValue, const char *pszFormat = nullptr );
    CPLSTRING_METHOD_DLL CPLString &Trim();
    CPLSTRING_METHOD_DLL CPLString &Recode( const char *pszSrcEncoding, const char *pszDstEncoding );
    CPLSTRING_METHOD_DLL CPLString &replaceAll(
        const std::string &osBefore, const std::string& osAfter );
    CPLSTRING_METHOD_DLL CPLString &replaceAll( const std::string &osBefore, char chAfter );
    CPLSTRING_METHOD_DLL CPLString &replaceAll( char chBefore, const std::string &osAfter );
    CPLSTRING_METHOD_DLL CPLString &replaceAll( char chBefore, char chAfter );
 
    /* case insensitive find alternates */
    CPLSTRING_METHOD_DLL size_t    ifind( const std::string & str, size_t pos = 0 ) const;
    CPLSTRING_METHOD_DLL size_t    ifind( const char * s, size_t pos = 0 ) const;
    CPLSTRING_METHOD_DLL CPLString &toupper( void );
    CPLSTRING_METHOD_DLL CPLString &tolower( void );
 
    CPLSTRING_METHOD_DLL bool      endsWith( const std::string& osStr ) const;
};
 
#undef CPLSTRING_CLASS_DLL
#undef CPLSTRING_METHOD_DLL
 
CPLString CPL_DLL CPLOPrintf(CPL_FORMAT_STRING(const char *pszFormat), ... )
    CPL_PRINT_FUNC_FORMAT (1, 2);
CPLString CPL_DLL CPLOvPrintf(
    CPL_FORMAT_STRING(const char *pszFormat), va_list args)
    CPL_PRINT_FUNC_FORMAT (1, 0);
CPLString CPL_DLL CPLQuotedSQLIdentifier(const char *pszIdent);
 
/* -------------------------------------------------------------------- */
/*      URL processing functions, here since they depend on CPLString.  */
/* -------------------------------------------------------------------- */
CPLString CPL_DLL CPLURLGetValue(const char* pszURL, const char* pszKey);
CPLString CPL_DLL CPLURLAddKVP(const char* pszURL, const char* pszKey,
                               const char* pszValue);
 
/************************************************************************/
/*                            CPLStringList                             */
/************************************************************************/
 
class CPL_DLL CPLStringList
{
    char **papszList = nullptr;
    mutable int nCount = 0;
    mutable int nAllocation = 0;
    bool   bOwnList = false;
    bool   bIsSorted = false;
 
    void   MakeOurOwnCopy();
    void   EnsureAllocation( int nMaxLength );
    int    FindSortedInsertionPoint( const char *pszLine );
 
  public:
    CPLStringList();
    explicit CPLStringList( char **papszList, int bTakeOwnership=TRUE );
    explicit CPLStringList( CSLConstList papszList );
    CPLStringList( const CPLStringList& oOther );
    ~CPLStringList();
 
    CPLStringList &Clear();
 
    int    size() const { return Count(); }
    int    Count() const;
 
    bool   empty() const { return Count() == 0; }
 
    CPLStringList &AddString( const char *pszNewString );
    CPLStringList &AddStringDirectly( char *pszNewString );
 
    CPLStringList &InsertString( int nInsertAtLineNo, const char *pszNewLine )
    { return InsertStringDirectly( nInsertAtLineNo, CPLStrdup(pszNewLine) ); }
    CPLStringList &InsertStringDirectly( int nInsertAtLineNo, char *pszNewLine);
 
    // CPLStringList &InsertStrings( int nInsertAtLineNo, char **papszNewLines );
    // CPLStringList &RemoveStrings( int nFirstLineToDelete, int nNumToRemove=1 );
 
    int    FindString( const char *pszTarget ) const
    { return CSLFindString( papszList, pszTarget ); }
    int    PartialFindString( const char *pszNeedle ) const
    { return CSLPartialFindString( papszList, pszNeedle ); }
 
    int    FindName( const char *pszName ) const;
    bool   FetchBool( const char *pszKey, bool bDefault ) const;
    // Deprecated.
    int    FetchBoolean( const char *pszKey, int bDefault ) const;
    const char *FetchNameValue( const char *pszKey ) const;
    const char *FetchNameValueDef(
        const char *pszKey, const char *pszDefault ) const;
    CPLStringList &AddNameValue( const char *pszKey, const char *pszValue );
    CPLStringList &SetNameValue( const char *pszKey, const char *pszValue );
 
    CPLStringList &Assign( char **papszListIn, int bTakeOwnership=TRUE );
    CPLStringList &operator=(char **papszListIn) {
      return Assign( papszListIn, TRUE ); }
    CPLStringList &operator=(const CPLStringList& oOther);
    CPLStringList &operator=(CSLConstList papszListIn);
    CPLStringList &operator=(CPLStringList&& oOther);
 
    char * operator[](int i);
    char * operator[](size_t i) { return (*this)[static_cast<int>(i)]; }
    const char * operator[](int i) const;
    const char * operator[](size_t i) const {
      return (*this)[static_cast<int>(i)]; }
    const char * operator[](const char* pszKey) const {
        return FetchNameValue(pszKey); }
 
    char** List() { return papszList; }
    CSLConstList List() const { return papszList; }
    char **StealList();
 
    CPLStringList &Sort();
    int    IsSorted() const { return bIsSorted; }
 
    operator char**(void) { return List(); }
    operator CSLConstList(void) const { return List(); }
};
 
#ifdef GDAL_COMPILATION
 
#include <memory>
 
struct CPL_DLL CSLDestroyReleaser
{
    void operator()(char** papszStr) const { CSLDestroy(papszStr); }
};
using CSLUniquePtr = std::unique_ptr< char*, CSLDestroyReleaser>;
 
struct CPL_DLL CPLFreeReleaser
{
    void operator()(void* p) const { CPLFree(p); }
};
using CPLCharUniquePtr = std::unique_ptr<char, CPLFreeReleaser>;
 
#endif
 
} // extern "C++"
 
#endif /* def __cplusplus && !CPL_SUPRESS_CPLUSPLUS */
 
#endif /* CPL_STRING_H_INCLUDED */