wxWidgets/include/wx/wxchar.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/wxchar.h
// Purpose:     Declarations common to wx char/wchar_t usage (wide chars)
// Author:      Joel Farley, Ove K<>ven
// Modified by: Vadim Zeitlin, Robert Roebling
// Created:     1998/06/12
// RCS-ID:      $Id$
// Copyright:   (c) 1998-2002 wxWindows dev team
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_WXCHAR_H_
#define _WX_WXCHAR_H_

#if defined(__GNUG__) && !defined(__APPLE__)
    #pragma interface "wxchar.h"
#endif

// ----------------------------------------------------------------------------
// first deal with Unicode setting: wxUSE_UNICODE should be defined as 0 or 1
// and is used by wxWindows, _UNICODE and/or UNICODE may be defined or used by
// the system headers so bring these settings in sync
// ----------------------------------------------------------------------------

// set wxUSE_UNICODE to 1 if UNICODE or _UNICODE is defined
#if defined(_UNICODE) || defined(UNICODE)
    #undef wxUSE_UNICODE
    #define wxUSE_UNICODE 1
#else
    #ifndef wxUSE_UNICODE
        #define wxUSE_UNICODE 0
    #endif
#endif // Unicode

// and vice versa: define UNICODE and _UNICODE if wxUSE_UNICODE is 1...
#if wxUSE_UNICODE
    #ifndef _UNICODE
        #define _UNICODE
    #endif
    #ifndef UNICODE
        #define UNICODE
    #endif
#endif // Unicode

// check whether we have wchar_t
#if !defined(wxUSE_WCHAR_T)
    #if defined(__WIN16__)
        // no wchar_t under Win16 regadrless of compiler used
        #define wxUSE_WCHAR_T 0
    #elif defined(__UNIX__)
        #if defined(HAVE_WCSTR_H) || defined(HAVE_WCHAR_H) || defined(__FreeBSD__) || defined(__DARWIN__)
            #define wxUSE_WCHAR_T 1
        #else
            #define wxUSE_WCHAR_T 0
        #endif
    #elif defined(__GNUWIN32__) && !defined(__MINGW32__)
        #define wxUSE_WCHAR_T 0
    #elif defined(__WATCOMC__)
        #define wxUSE_WCHAR_T 0
    #elif defined(__VISAGECPP__) && (__IBMCPP__ < 400)
        #define wxUSE_WCHAR_T 0
    #else
        // add additional compiler checks if this fails
        #define wxUSE_WCHAR_T 1
    #endif
#endif // !defined(wxUSE_WCHAR_T)

// Unicode support requires wchar_t
#if wxUSE_UNICODE && !wxUSE_WCHAR_T
    #error "wchar_t must be available in Unicode build"
#endif // Unicode

// ----------------------------------------------------------------------------
// standard headers we need here
//
// NB: don't include any wxWindows headers here because almost of them include
//     this one!
// ----------------------------------------------------------------------------

// Required for wxPrintf() etc
#include <stdarg.h>

// Almost all compiler have strdup(), but not quite all: CodeWarrior under Mac
// and VC++ for Windows CE don't provide it
#if !(defined(__MWERKS__) && defined(__WXMAC__)) && !defined(__WXWINCE__)
    // use #define, not inline wrapper, as it is tested with #ifndef below
    #define wxStrdupA strdup
#endif

// non Unix compilers which do have wchar.h (but not tchar.h which is included
// below and which includes wchar.h anyhow).
// Actually MinGW has tchar.h, but it does not include wchar.h
#if defined(__MWERKS__) || defined(__VISAGECPP__) || defined(__MINGW32__)
    #ifndef HAVE_WCHAR_H
        #define HAVE_WCHAR_H
    #endif
#endif

#if wxUSE_WCHAR_T
    #ifdef HAVE_WCHAR_H
        // the current (as of Nov 2002) version of cygwin has a bug in its
        // wchar.h -- there is no extern "C" around the declarations in it and
        // this results in linking errors later; also, at least on some
        // Cygwin versions, wchar.h requires sys/types.h
        #ifdef __CYGWIN__
            #include <sys/types.h>
            extern "C" {
        #endif // Cygwin
                #include <wchar.h>
        #ifdef __CYGWIN__
            }
        #endif // Cygwin
    #elif defined(HAVE_WCSTR_H)
        // old compilers have relevant declarations here
        #include <wcstr.h>
    #elif defined(__FreeBSD__) || defined(__DARWIN__) || defined(__EMX__)
        // include stdlib.h for wchar_t
        #include <stdlib.h>
    #endif // HAVE_WCHAR_H
#endif // wxUSE_WCHAR_T

// ----------------------------------------------------------------------------
// define wxHAVE_TCHAR_SUPPORT for the compilers which support the TCHAR type
// mapped to either char or wchar_t depending on the ASCII/Unicode mode and have
// the function mapping _tfoo() -> foo() or wfoo()
// ----------------------------------------------------------------------------

// VC++ and BC++ starting with 5.2 have TCHAR support
#ifdef __VISUALC__
    #define wxHAVE_TCHAR_SUPPORT
#elif defined(__BORLANDC__) && (__BORLANDC__ >= 0x520)
    #define wxHAVE_TCHAR_SUPPORT
    #include <ctype.h>
#elif defined(__MINGW32__) && wxCHECK_W32API_VERSION( 1, 0 )
    #define wxHAVE_TCHAR_SUPPORT
    #include <stddef.h>
    #include <string.h>
    #include <ctype.h>
#elif 0 && defined(__VISAGECPP__) && (__IBMCPP__ >= 400)
    // VZ: the old VisualAge definitions were completely wrong and had no
    //     chance at all to work in Unicode build anyhow so let's pretend that
    //     VisualAge does _not_ support TCHAR for the moment (as indicated by
    //     "0 &&" above) until someone really has time to delve into Unicode
    //     issues under OS/2

    // VisualAge 4.0+ supports TCHAR
    #define wxHAVE_TCHAR_SUPPORT
#endif // compilers with (good) TCHAR support

#ifdef __MWERKS__
    #define HAVE_WPRINTF
#endif

#ifdef wxHAVE_TCHAR_SUPPORT
    // get TCHAR definition if we've got it
    #include <tchar.h>

    // we surely do have wchar_t if we have TCHAR
    #ifndef wxUSE_WCHAR_T
        #define wxUSE_WCHAR_T 1
    #endif // !defined(wxUSE_WCHAR_T)

    // and we also do have wcslen()
    #ifndef HAVE_WCSLEN
        #define HAVE_WCSLEN
    #endif
#endif // wxHAVE_TCHAR_SUPPORT

// ----------------------------------------------------------------------------
// define wxChar type
// ----------------------------------------------------------------------------

// TODO: define wxCharInt to be equal to either int or wint_t?

#if !wxUSE_UNICODE
    typedef char wxChar;
    typedef signed char wxSChar;
    typedef unsigned char wxUChar;
#else // Unicode
    // VZ: note that VC++ defines _T[SU]CHAR simply as wchar_t and not as
    //     signed/unsigned version of it which (a) makes sense to me (unlike
    //     char wchar_t is always unsigned) and (b) was how the previous
    //     definitions worked so keep it like this

    // GNU libc has __WCHAR_TYPE__ which requires special treatment, see
    // comment below
    #if !defined(__WCHAR_TYPE__) || \
        (!defined(__GNUC__) || wxCHECK_GCC_VERSION(2, 96))
        // standard case
        typedef wchar_t wxChar;
        typedef wchar_t wxSChar;
        typedef wchar_t wxUChar;
    #else // __WCHAR_TYPE__ and gcc < 2.96
        // VS: wxWindows used to define wxChar as __WCHAR_TYPE__ here. However,
        //     this doesn't work with new GCC 3.x compilers because wchar_t is
        //     C++'s builtin type in the new standard. OTOH, old compilers (GCC
        //     2.x) won't accept new definition of wx{S,U}Char, therefore we
        //     have to define wxChar conditionally depending on detected
        //     compiler & compiler version.
        //     with old definition of wxChar.
        typedef __WCHAR_TYPE__ wxChar;
        typedef __WCHAR_TYPE__ wxSChar;
        typedef __WCHAR_TYPE__ wxUChar;
    #endif // __WCHAR_TYPE__
#endif // ASCII/Unicode

// ----------------------------------------------------------------------------
// define _T() and related macros
// ----------------------------------------------------------------------------

// BSD systems define _T() to be something different in ctype.h, override it
#if defined(__FreeBSD__) || defined(__DARWIN__)
    #include <ctype.h>
    #undef _T
#endif

// could already be defined by tchar.h (it's quasi standard)
#ifndef _T
    #if !wxUSE_UNICODE
        #define _T(x) x
    #else // Unicode
        #define _T(x) L ## x
    #endif // ASCII/Unicode
#endif // !defined(_T)

// although global macros with such names are normally bad, we want to have
// another name for _T() which should be used to avoid confusion between _T()
// and _() in wxWindows sources
#define wxT(x)       _T(x)

// Unicode-friendly __FILE__, __DATE__ and __TIME__ analogs
#ifndef __TFILE__
    #define __XFILE__(x) wxT(x)
    #define __TFILE__ __XFILE__(__FILE__)
#endif

#ifndef __TDATE__
    #define __XDATE__(x) wxT(x)
    #define __TDATE__ __XDATE__(__DATE__)
#endif

#ifndef __TTIME__
    #define __XTIME__(x) wxT(x)
    #define __TTIME__ __XTIME__(__TIME__)
#endif

// ----------------------------------------------------------------------------
// define wxFoo() function for each standard foo() function whose signature
// (exceptionally including the return type) includes any mention of char:
// wxFoo() is going to be a Unicode-friendly version of foo(), i.e. will have
// the same signature but with char replaced by wxChar which allows us to use
// it in Unicode build as well
// ----------------------------------------------------------------------------

#ifdef wxHAVE_TCHAR_SUPPORT
    #include <ctype.h>

    // ctype.h functions
    #define  wxIsalnum   _istalnum
    #define  wxIsalpha   _istalpha
    #define  wxIsctrl    _istctrl
    #define  wxIsdigit   _istdigit
    #define  wxIsgraph   _istgraph
    #define  wxIslower   _istlower
    #define  wxIsprint   _istprint
    #define  wxIspunct   _istpunct
    #define  wxIsspace   _istspace
    #define  wxIsupper   _istupper
    #define  wxIsxdigit  _istxdigit
    #define  wxTolower   _totlower
    #define  wxToupper   _totupper

    // locale.h functons
    #define  wxSetlocale _tsetlocale

    // string.h functions
    #define  wxStrcat    _tcscat
    #define  wxStrchr    _tcschr
    #define  wxStrcmp    _tcscmp
    #define  wxStrcoll   _tcscoll
    #define  wxStrcpy    _tcscpy
    #define  wxStrcspn   _tcscspn
    #define  wxStrdupW   _wcsdup        // notice the 'W'!
    #define  wxStrftime  _tcsftime
    #define  wxStricmp   _tcsicmp
    #define  wxStrnicmp  _tcsnicmp
    #define  wxStrlen_   _tcslen        // used in wxStrlen inline function
    #define  wxStrncat   _tcsncat
    #define  wxStrncmp   _tcsncmp
    #define  wxStrncpy   _tcsncpy
    #define  wxStrpbrk   _tcspbrk
    #define  wxStrrchr   _tcsrchr
    #define  wxStrspn    _tcsspn
    #define  wxStrstr    _tcsstr
    #define  wxStrtod    _tcstod
    #define  wxStrtol    _tcstol
    #define  wxStrtoul   _tcstoul
    #define  wxStrxfrm   _tcsxfrm

    // stdio.h functions
    #define  wxFgetc     _fgettc
    #define  wxFgetchar  _fgettchar
    #define  wxFgets     _fgetts
    #define  wxFopen     _tfopen
    #define  wxFputc     _fputtc
    #define  wxFputchar  _fputtchar
    #define  wxFprintf   _ftprintf
    #define  wxFputs     _fputts
    #define  wxFreopen   _tfreopen
    #define  wxFscanf    _ftscanf
    #define  wxGetc      _gettc
    #define  wxGetchar   _gettchar
    #define  wxGets      _getts
    #define  wxPerror    _tperror
    #define  wxPrintf    _tprintf
    #define  wxPutc      _puttc
    #define  wxPutchar   _puttchar
    #define  wxPuts      _putts
    #define  wxScanf     _tscanf
    #define  wxSprintf   _stprintf
    #define  wxSscanf    _stscanf
    #define  wxTmpnam    _ttmpnam
    #define  wxUngetc    _tungetc
    #define  wxVfprintf  _vftprintf
    #define  wxVprintf   _vtprintf
    #define  wxVsscanf   _vstscanf
    #define  wxVsprintf  _vstprintf

    // special case: not all TCHAR-aware compilers have those
    #if defined(__VISUALC__) || \
            (defined(__BORLANDC__) && __BORLANDC__ >= 0x540)
        #define wxVsnprintf_    _vsntprintf
        #define wxSnprintf_     _sntprintf
    #endif

    // special case: these functions are missing under Win9x with Unicows so we
    // have to implement them ourselves
    #if wxUSE_UNICODE_MSLU
        #define  wxRemove    wxMSLU__tremove
        #define  wxRename    wxMSLU__trename
    #else
        #define  wxRemove    _tremove
        #define  wxRename    _trename
    #endif

    // stdlib.h functions
    #define  wxAtoi      _ttoi
    #define  wxAtol      _ttol
    // #define  wxAtof   _tttof -- notice that there is no such thing (why?)
    #define  wxGetenv    _tgetenv
    #define  wxSystem    _tsystem

    // time.h functions
    #define  wxAsctime   _tasctime
    #define  wxCtime     _tctime
#else // !TCHAR-aware compilers
    #if wxUSE_UNICODE
        #include <wctype.h>

        // this is probably glibc-specific
        #if defined(__WCHAR_TYPE__)
            // ctype.h functions (wctype.h)
            #define  wxIsalnum   iswalnum
            #define  wxIsalpha   iswalpha
            #define  wxIsctrl    iswcntrl
            #define  wxIsdigit   iswdigit
            #define  wxIsgraph   iswgraph
            #define  wxIslower   iswlower
            #define  wxIsprint   iswprint
            #define  wxIspunct   iswpunct
            #define  wxIsspace   iswspace
            #define  wxIsupper   iswupper
            #define  wxIsxdigit  iswxdigit

            #if defined(__GLIBC__) && (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0)
                // /usr/include/wctype.h incorrectly declares translations
                // tables which provokes tons of compile-time warnings -- try
                // to correct this
                #define  wxTolower(wc)   towctrans((wc), (wctrans_t)__ctype_tolower)
                #define  wxToupper(wc)   towctrans((wc), (wctrans_t)__ctype_toupper)
            #else // !glibc 2.0
                #define  wxTolower   towlower
                #define  wxToupper   towupper
            #endif // gcc/!gcc

            // string.h functions (wchar.h)
            #define  wxStrcat    wcscat
            #define  wxStrchr    wcschr
            #define  wxStrcmp    wcscmp
            #define  wxStrcoll   wcscoll
            #define  wxStrcpy    wcscpy
            #define  wxStrcspn   wcscspn
            #define  wxStrlen_   wxWcslen // wxStrlen_() is used in wxStrlen()
            #define  wxStrncat   wcsncat
            #define  wxStrncmp   wcsncmp
            #define  wxStrncpy   wcsncpy
            #define  wxStrpbrk   wcspbrk
            #define  wxStrrchr   wcsrchr
            #define  wxStrspn    wcsspn
            #define  wxStrstr    wcsstr
            #define  wxStrtod    wcstod
            #define  wxStrtol    wcstol
            #define  wxStrtoul   wcstoul
            #define  wxStrxfrm   wcsxfrm

            #define  wxFgetc     fgetwc
            #define  wxFgetchar  fgetwchar
            #define  wxFgets     fgetws
            #define  wxFputc     fputwc
            #define  wxFputchar  fputwchar
            #define  wxGetc      getwc
            #define  wxGetchar   getwchar
            #define  wxGets      getws
            #define  wxUngetc    ungetwc

            #ifdef HAVE_FPUTWC
                #define  wxPutc      wputc
                #define  wxPutchar   wputchar
                #define  wxPuts      putws
                #define  wxFputs     fputws
            #else
                #define wxNEED_FPUTWC

                #include <stdio.h>

                int wxFputs(const wxChar *ch, FILE *stream);
                int wxPutc(wxChar ch, FILE *stream);

                #define wxPuts(ws) wxFputs(ws, stdout)
                #define wxPutchar(wch) wxPutc(wch, stdout)
            #endif

            // we need %s to %ls conversion for printf and scanf etc
            #define wxNEED_PRINTF_CONVERSION

            // glibc doesn't have wide char equivalents of the other stuff so
            // use our own versions
            #define wxNEED_WX_STDIO_H
            #define wxNEED_WX_STDLIB_H
            #define wxNEED_WX_TIME_H
        #elif defined(__MWERKS__) && ( defined(macintosh) || defined(__MACH__) )
            // ctype.h functions (wctype.h)
            #define  wxIsalnum   iswalnum
            #define  wxIsalpha   iswalpha
            #define  wxIsctrl    iswcntrl
            #define  wxIsdigit   iswdigit
            #define  wxIsgraph   iswgraph
            #define  wxIslower   iswlower
            #define  wxIsprint   iswprint
            #define  wxIspunct   iswpunct
            #define  wxIsspace   iswspace
            #define  wxIsupper   iswupper
            #define  wxIsxdigit  iswxdigit
            #define  wxTolower   towlower
            #define  wxToupper   towupper

            // string.h functions (wchar.h)
            #define  wxStrcat    wcscat
            #define  wxStrchr    wcschr
            #define  wxStrcmp    wcscmp
            #define  wxStrcoll   wcscoll
            #define  wxStrcpy    wcscpy
            #define  wxStrcspn   wcscspn
            #define  wxStrlen_   wxWcslen // wxStrlen_() is used in wxStrlen()
            #define  wxStrncat   wcsncat
            #define  wxStrncmp   wcsncmp
            #define  wxStrncpy   wcsncpy
            #define  wxStrpbrk   wcspbrk
            #define  wxStrrchr   wcsrchr
            #define  wxStrspn    wcsspn
            #define  wxStrstr    wcsstr
            #define  wxStrtod    wcstod
            #define  wxStrtol    wcstol
            #define  wxStrtoul   wcstoul
            #define  wxStrxfrm   wcsxfrm

            #define  wxFgetc     fgetwc
            #define  wxFgetchar  fgetwchar
            #define  wxFgets     fgetws
            #define  wxFputc     fputwc
            #define  wxFputchar  fputwchar
            #define  wxGetc      getwc
            #define  wxGetchar   getwchar
            #define  wxGets      getws
            #define  wxUngetc    ungetwc

            #define wxNEED_PRINTF_CONVERSION

            #define  wxPutc      putwc
            #define  wxPutchar   putwchar
            #define  wxFputs     fputws
            
            // stdio.h functions
            
             #define wxNEED_WX_STDIO_H

            // stdlib.h functions
            #define  wxAtof      watof
            #define  wxAtoi      watoi
            #define  wxAtol      watol
            #define  wxGetenv(a)    ((wxChar*)NULL)
            #define  wxSystem(a)    ((int)NULL)

            // time.h functions
            #define  wxAsctime   wasciitime
            #define  wxCtime     wctime
            #define  wxStrftime  wcsftime

            /*
            #define wxNEED_FPUTWC

            #include <stdio.h>

            int wxFputs(const wxChar *ch, FILE *stream);
            int wxPutc(wxChar ch, FILE *stream);

            #define wxPuts(ws) wxFputs(ws, stdout)
            #define wxPutchar(wch) wxPutc(wch, stdout)

            // we need %s to %ls conversion for printf and scanf etc
            #define wxNEED_PRINTF_CONVERSION
            // glibc doesn't have wide char equivalents of the other stuff so
            // use our own versions
            #define wxNEED_WX_STDIO_H
            #define wxNEED_WX_STDLIB_H
            #define wxNEED_WX_TIME_H
            */
        #else // !metrowerks for apple
            #error  "Please define wide character functions for your environment"
        #endif
    #else // ASCII
        #include <ctype.h>
        #include <string.h>

        // ctype.h functions
        #define  wxIsalnum   isalnum
        #define  wxIsalpha   isalpha
        #define  wxIsctrl    isctrl
        #define  wxIsdigit   isdigit
        #define  wxIsgraph   isgraph
        #define  wxIslower   islower
        #define  wxIsprint   isprint
        #define  wxIspunct   ispunct
        #define  wxIsspace   isspace
        #define  wxIsupper   isupper
        #define  wxIsxdigit  isxdigit
        #define  wxTolower   tolower
        #define  wxToupper   toupper

         // locale.h functons
        #define  wxSetlocale setlocale

         // string.h functions
        #define  wxStrcat    strcat
        #define  wxStrchr    strchr
        #define  wxStrcmp    strcmp
        #define  wxStrcoll   strcoll
        #define  wxStrcpy    strcpy
        #define  wxStrcspn   strcspn

        // wxStricmp and wxStrnicmp are defined below
        #define  wxStrlen_   strlen // used in wxStrlen inline function
        #define  wxStrncat   strncat
        #define  wxStrncmp   strncmp
        #define  wxStrncpy   strncpy
        #define  wxStrpbrk   strpbrk
        #define  wxStrrchr   strrchr
        #define  wxStrspn    strspn
        #define  wxStrstr    strstr
        #define  wxStrtod    strtod
        #ifdef HAVE_STRTOK_R
            #define  wxStrtok(str, sep, last)    strtok_r(str, sep, last)
        #endif
        #define  wxStrtol    strtol
        #define  wxStrtoul   strtoul
        #define  wxStrxfrm   strxfrm

        // stdio.h functions
        #define  wxFopen     fopen
        #define  wxFreopen   freopen
        #define  wxPerror    perror
        #define  wxRemove    remove
        #define  wxRename    rename
        #define  wxTmpnam    tmpnam

        #define  wxFgetc     fgetc
        #define  wxFgetchar  fgetchar
        #define  wxFgets     fgets
        #define  wxFputc     fputc
        #define  wxFputchar  fputchar
        #define  wxFprintf   fprintf
        #define  wxFscanf    fscanf
        #define  wxGetc      getc
        #define  wxGetchar   getchar
        #define  wxGets      gets
        #define  wxPrintf    printf
        #define  wxPutc      putc
        #define  wxPutchar   putchar
        #define  wxPuts      puts
        #define  wxScanf     scanf
        #define  wxSprintf   sprintf
        #define  wxSscanf    sscanf
        #define  wxUngetc    ungetc
        #define  wxVfprintf  vfprintf
        #define  wxVprintf   vprintf
        #define  wxVsscanf   vsscanf
        #define  wxVsprintf  vsprintf

        // stdlib.h functions
        #define  wxAtof      atof
        #define  wxAtoi      atoi
        #define  wxAtol      atol
        #define  wxGetenv    getenv
        #define  wxSystem    system

        // time.h functions
        #define  wxAsctime   asctime
        #define  wxCtime     ctime
        #define  wxStrftime  strftime
    #endif // Unicode/ASCII
#endif // TCHAR-aware compilers/the others

// ----------------------------------------------------------------------------
// various special cases
// ----------------------------------------------------------------------------

// define wxStricmp and wxStrnicmp for various compilers
//
// note that in Unicode mode we definitely are going to need our own version
#if !defined(wxStricmp) && !wxUSE_UNICODE
    #if defined(__BORLANDC__) || defined(__WATCOMC__) || \
            defined(__SALFORDC__) || defined(__VISAGECPP__) || \
            defined(__EMX__) || defined(__DJGPP__)
        #define wxStricmp stricmp
        #define wxStrnicmp strnicmp
    #elif defined(__SC__) || defined(__VISUALC__) || \
            (defined(__MWERKS__) && defined(__INTEL__))
        #define wxStricmp _stricmp
        #define wxStrnicmp _strnicmp
    #elif defined(__UNIX__) || defined(__GNUWIN32__)
        #define wxStricmp strcasecmp
        #define wxStrnicmp strncasecmp
    // #else -- use wxWindows implementation
    #endif
#endif // !defined(wxStricmp)

// define wxWcslen() which should be always available if wxUSE_WCHAR_T == 1 (as
// it's used in wx/buffer.h -- and also might be used just below by wxStrlen()
// when wxStrlen_() is #define'd as wxWcslen so do it before defining wxStrlen)
#if wxUSE_WCHAR_T
    #ifdef HAVE_WCSLEN
        #define wxWcslen wcslen
    #else
        inline size_t wxWcslen(const wchar_t *s)
        {
            size_t n = 0;
            while ( *s++ )
                n++;

            return n;
        }
    #endif
#endif // wxUSE_WCHAR_T

// checks whether the passed in pointer is NULL and if the string is empty
inline bool wxIsEmpty(const wxChar *p) { return !p || !*p; }

// safe version of strlen() (returns 0 if passed NULL pointer)
inline size_t wxStrlen(const wxChar *psz) { return psz ? wxStrlen_(psz) : 0; }

// each of strdup() and wcsdup() may or may not be available but we need both
// of them anyhow for wx/buffer.h so we define the missing one(s) in
// wxchar.cpp and so we should always have both wxStrdupA and wxStrdupW
// defined -- if this is somehow not the case in some situations, please
// correct that and not the lines here
#if wxUSE_UNICODE
    #define wxStrdup wxStrdupW
#else
    #define wxStrdup wxStrdupA
#endif

WXDLLEXPORT bool wxOKlibc(); // for internal use

// ----------------------------------------------------------------------------
// printf() family saga
// ----------------------------------------------------------------------------

/*
   For some systems vsnprintf() exists in the system libraries but not in the
   headers, so we need to declare it ourselves to be able to use it.
 */
#if defined(HAVE_VSNPRINTF) && !defined(HAVE_VSNPRINTF_DECL)
    extern "C"
    int vsnprintf(char *str, size_t size, const char *format, va_list ap);
#endif // !HAVE_VSNPRINTF_DECL

/*
   First of all, we always want to define safe snprintf() function to be used
   instead of sprintf(). Some compilers already have it (or rather vsnprintf()
   which we really need...), otherwise we implement it using our own printf()
   code.

   We define function with a trailing underscore here because the real one is a
   wrapper around it as explained below
 */
#ifndef wxVsnprintf_
    #if wxUSE_UNICODE
        #if defined(__MWERKS__)
            #define HAVE_WCSRTOMBS 1
            #define HAVE_VSWPRINTF 1
        #endif
        #if defined(HAVE__VSNWPRINTF)
            #define wxVsnprintf_    _vsnwprintf
        /* MinGW?MSVCRT has the wrong vswprintf */
        #elif defined(HAVE_VSWPRINTF) && !defined(__MINGW32__)
            #define wxVsnprintf_    vswprintf
        #endif
    #else // ASCII
        // all versions of CodeWarrior supported by wxWindows apparently have
        // vsnprintf()
        #if defined(HAVE_VSNPRINTF) || defined(__MWERKS__)
            // assume we have snprintf() too if we have vsnprintf()
            #define wxVsnprintf_    vsnprintf
            #define wxSnprintf_     snprintf
        #endif
    #endif
#endif // wxVsnprintf_ not defined yet

#ifndef wxSnprintf_
    // no [v]snprintf(), cook our own
    WXDLLEXPORT int wxSnprintf_(wxChar *buf, size_t len, const wxChar *format,
                                ...) ATTRIBUTE_PRINTF_3;
#endif
#ifndef wxVsnprintf_
    WXDLLEXPORT int wxVsnprintf_(wxChar *buf, size_t len, const wxChar *format,
                                 va_list argptr);
#endif

/*
   In Unicode mode we need to have all standard functions such as wprintf() and
   so on but not all systems have them so use our own implementations in this
   case.
 */
#if wxUSE_UNICODE && !defined(wxHAVE_TCHAR_SUPPORT) && !defined(HAVE_WPRINTF)
    #define wxNEED_WPRINTF
#endif

/*
   More Unicode complications: although both ANSI C and C++ define a number of
   wide character functions such as wprintf(), not all environments have them.
   Worse, those which do have different behaviours: under Windows, %s format
   specifier changes its meaning in Unicode build and expects a Unicode string
   while under Unix/POSIX it still means an ASCII string even for wprintf() and
   %ls has to be used for wide strings.

   We choose to always emulate Windows behaviour as more useful for us so even
   if we have wprintf() we still must wrap it in a non trivial wxPrintf().

   However, if we don't have any vswprintf() at all we don't need to redefine
   anything as our own wxVsnprintf_() already behaves as needed.
*/
#ifndef wxVsnprintf_
    #undef wxNEED_PRINTF_CONVERSION
#endif

#if defined(wxNEED_PRINTF_CONVERSION) || defined(wxNEED_WPRINTF)
    // we need to implement all wide character printf and scanf functions
    // either because we don't have them at all or because they don't have the
    // semantics we need

    #include <stdio.h>  // for FILE

    int wxScanf( const wxChar *format, ... ) ATTRIBUTE_PRINTF_1;
    int wxSscanf( const wxChar *str, const wxChar *format, ... ) ATTRIBUTE_PRINTF_2;
    int wxFscanf( FILE *stream, const wxChar *format, ... ) ATTRIBUTE_PRINTF_2;
    int wxVsscanf( const wxChar *str, const wxChar *format, va_list ap );
    int wxPrintf( const wxChar *format, ... ) ATTRIBUTE_PRINTF_1;
    int wxSprintf( wxChar *str, const wxChar *format, ... ) ATTRIBUTE_PRINTF_2;
    int wxFprintf( FILE *stream, const wxChar *format, ... ) ATTRIBUTE_PRINTF_2;
    int wxVfprintf( FILE *stream, const wxChar *format, va_list ap );
    int wxVprintf( const wxChar *format, va_list ap );
    int wxVsprintf( wxChar *str, const wxChar *format, va_list ap );
#endif // wxNEED_PRINTF_CONVERSION

// these 2 can be simply mapped to the versions with underscore at the end
// if we don't have to do the conversion
#ifdef wxNEED_PRINTF_CONVERSION
    int wxSnprintf( wxChar *str, size_t size, const wxChar *format, ... ) ATTRIBUTE_PRINTF_3;
    int wxVsnprintf( wxChar *str, size_t size, const wxChar *format, va_list ap );
#else
    #define wxSnprintf wxSnprintf_
    #define wxVsnprintf wxVsnprintf_
#endif

// ----------------------------------------------------------------------------
// various functions which might not be available in libc and for which we
// provide our own replacements in wxchar.cpp
// ----------------------------------------------------------------------------

// ctype.h functions
//
// VZ: note that this is never defined currently
#ifdef wxNEED_WX_CTYPE_H
    WXDLLEXPORT int wxIsalnum(wxChar ch);
    WXDLLEXPORT int wxIsalpha(wxChar ch);
    WXDLLEXPORT int wxIsctrl(wxChar ch);
    WXDLLEXPORT int wxIsdigit(wxChar ch);
    WXDLLEXPORT int wxIsgraph(wxChar ch);
    WXDLLEXPORT int wxIslower(wxChar ch);
    WXDLLEXPORT int wxIsprint(wxChar ch);
    WXDLLEXPORT int wxIspunct(wxChar ch);
    WXDLLEXPORT int wxIsspace(wxChar ch);
    WXDLLEXPORT int wxIsupper(wxChar ch);
    WXDLLEXPORT int wxIsxdigit(wxChar ch);
    WXDLLEXPORT int wxTolower(wxChar ch);
    WXDLLEXPORT int wxToupper(wxChar ch);
#endif // wxNEED_WX_CTYPE_H

// under VC++ 6.0 isspace() returns 1 for 8 bit chars which completely breaks
// the file parsing -- this may be true for 5.0 as well, update #ifdef then
#if defined(__VISUALC__) && (__VISUALC__ >= 1200) && !wxUSE_UNICODE
    #undef wxIsspace
    #define wxIsspace(c) ((((unsigned)c) < 128) && isspace(c))
#endif // VC++


// string.h functions
//
// VZ: this is never defined neither currently
#ifdef wxNEED_WX_STRING_H
    WXDLLEXPORT wxChar * wxStrcat(wxChar *dest, const wxChar *src);
    WXDLLEXPORT const wxChar * wxStrchr(const wxChar *s, wxChar c);
    WXDLLEXPORT wxChar * wxStrchr(wxChar *s, wxChar c)
        { return (wxChar *)wxStrchr((const wxChar *)s, c); }
    WXDLLEXPORT int      wxStrcmp(const wxChar *s1, const wxChar *s2);
    WXDLLEXPORT int      wxStrcoll(const wxChar *s1, const wxChar *s2);
    WXDLLEXPORT wxChar * wxStrcpy(wxChar *dest, const wxChar *src);
    WXDLLEXPORT size_t   wxStrcspn(const wxChar *s, const wxChar *reject);
    WXDLLEXPORT size_t   wxStrlen(const wxChar *s);
    WXDLLEXPORT wxChar * wxStrncat(wxChar *dest, const wxChar *src, size_t n);
    WXDLLEXPORT int      wxStrncmp(const wxChar *s1, const wxChar *s2, size_t n);
    WXDLLEXPORT wxChar * wxStrncpy(wxChar *dest, const wxChar *src, size_t n);
    WXDLLEXPORT const wxChar * wxStrpbrk(const wxChar *s, const wxChar *accept);
    WXDLLEXPORT wxChar * wxStrpbrk(wxChar *s, const wxChar *accept)
        { return (wxChar *)wxStrpbrk((const wxChar *)s, accept); }
    WXDLLEXPORT const wxChar * wxStrrchr(const wxChar *s, wxChar c);
    WXDLLEXPORT wxChar * wxStrrchr(wxChar *s, wxChar c)
        { return (wxChar *)wxStrrchr((const wxChar *)s, c); }
    WXDLLEXPORT size_t   wxStrspn(const wxChar *s, const wxChar *accept);
    WXDLLEXPORT const wxChar * wxStrstr(const wxChar *haystack, const wxChar *needle);
    WXDLLEXPORT wxChar *wxStrstr(wxChar *haystack, const wxChar *needle)
        { return (wxChar *)wxStrstr((const wxChar *)haystack, needle); }
    WXDLLEXPORT double   wxStrtod(const wxChar *nptr, wxChar **endptr);
    WXDLLEXPORT long int wxStrtol(const wxChar *nptr, wxChar **endptr, int base);
    WXDLLEXPORT unsigned long int wxStrtoul(const wxChar *nptr, wxChar **endptr, int base);
    WXDLLEXPORT size_t   wxStrxfrm(wxChar *dest, const wxChar *src, size_t n);
#endif // wxNEED_WX_STRING_H

#ifndef wxStrdupA
WXDLLEXPORT char *wxStrdupA(const char *psz);
#endif

#ifndef wxStrdupW
WXDLLEXPORT wchar_t *wxStrdupW(const wchar_t *pwz);
#endif

#ifndef wxStricmp
WXDLLEXPORT int wxStricmp(const wxChar *psz1, const wxChar *psz2);
#endif

#ifndef wxStrnicmp
WXDLLEXPORT int wxStrnicmp(const wxChar *psz1, const wxChar *psz2, size_t len);
#endif

#ifndef wxStrtok
WXDLLEXPORT wxChar * wxStrtok(wxChar *psz, const wxChar *delim, wxChar **save_ptr);
#endif

#ifndef wxSetlocale
class WXDLLEXPORT wxWCharBuffer;
WXDLLEXPORT wxWCharBuffer wxSetlocale(int category, const wxChar *locale);
#endif

// stdio.h functions
#ifdef wxNEED_WX_STDIO_H
    #include <stdio.h>
    WXDLLEXPORT FILE *   wxFopen(const wxChar *path, const wxChar *mode);
    WXDLLEXPORT FILE *   wxFreopen(const wxChar *path, const wxChar *mode, FILE *stream);
    WXDLLEXPORT int      wxRemove(const wxChar *path);
    WXDLLEXPORT int      wxRename(const wxChar *oldpath, const wxChar *newpath);

    // *printf() family is handled separately
#endif // wxNEED_WX_STDIO_H


// stdlib.h functions
#ifndef wxAtof
WXDLLEXPORT double   wxAtof(const wxChar *psz);
#endif

#ifdef wxNEED_WX_STDLIB_H
WXDLLEXPORT int      wxAtoi(const wxChar *psz);
WXDLLEXPORT long     wxAtol(const wxChar *psz);
WXDLLEXPORT wxChar * wxGetenv(const wxChar *name);
WXDLLEXPORT int      wxSystem(const wxChar *psz);
#endif


// time.h functions
#ifdef wxNEED_WX_TIME_H
#if defined(__MWERKS__) && defined(macintosh)
    #include <time.h> 
#endif
    WXDLLEXPORT size_t wxStrftime(wxChar *s, size_t max,
                                  const wxChar *fmt, const struct tm *tm);
#endif // wxNEED_WX_TIME_H

// ----------------------------------------------------------------------------
// multibyte to wide char conversion functions and macros
// ----------------------------------------------------------------------------

#if wxUSE_WCHAR_T
    // multibyte<->widechar conversion
    WXDLLEXPORT size_t wxMB2WC(wchar_t *buf, const char *psz, size_t n);
    WXDLLEXPORT size_t wxWC2MB(char *buf, const wchar_t *psz, size_t n);

    #if wxUSE_UNICODE
        #define wxMB2WX wxMB2WC
        #define wxWX2MB wxWC2MB
        #define wxWC2WX wxStrncpy
        #define wxWX2WC wxStrncpy
    #else
        #define wxMB2WX wxStrncpy
        #define wxWX2MB wxStrncpy
        #define wxWC2WX wxWC2MB
        #define wxWX2WC wxMB2WC
    #endif
#else // !wxUSE_UNICODE
    // No wxUSE_WCHAR_T: we have to do something (JACS)
    #define wxMB2WC wxStrncpy
    #define wxWC2MB wxStrncpy
    #define wxMB2WX wxStrncpy
    #define wxWX2MB wxStrncpy
    #define wxWC2WX wxWC2MB
    #define wxWX2WC wxMB2WC
#endif

#endif //_WX_WXCHAR_H_