wxchar.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        wxchar.cpp
// Purpose:     wxChar implementation
// Author:      Ove K鍁en
// Modified by: Ron Lee
// Created:     09/04/99
// RCS-ID:      $Id: wxchar.cpp,v 1.105.2.1 2006/01/06 17:06:41 VZ Exp $
// Copyright:   (c) wxWidgets copyright
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  #pragma implementation "wxchar.h"
#endif

// ===========================================================================
// headers, declarations, constants
// ===========================================================================

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#define _ISOC9X_SOURCE 1 // to get vsscanf()
#define _BSD_SOURCE    1 // to still get strdup()

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifndef __WXWINCE__
#include <time.h>
#include <locale.h>
#else
#include "wx/msw/wince/time.h"
#endif

#ifndef WX_PRECOMP
  #include "wx/defs.h"
  #include "wx/wxchar.h"
  #include "wx/string.h"
  #include "wx/hash.h"
#endif

#if defined(__WIN32__) && defined(wxNEED_WX_CTYPE_H)
  #include <windef.h>
  #include <winbase.h>
  #include <winnls.h>
  #include <winnt.h>
#endif

#if defined(__MWERKS__) && __MSL__ >= 0x6000
namespace std {}
using namespace std ;
#endif

#ifdef __WXMAC__
    #include "wx/mac/private.h"
#endif

#if wxUSE_WCHAR_T
size_t WXDLLEXPORT wxMB2WC(wchar_t *buf, const char *psz, size_t n)
{
  // assume that we have mbsrtowcs() too if we have wcsrtombs()
#ifdef HAVE_WCSRTOMBS
  mbstate_t mbstate;
  memset(&mbstate, 0, sizeof(mbstate_t));
#endif

  if (buf) {
    if (!n || !*psz) {
      if (n) *buf = wxT('\0');
      return 0;
    }
#ifdef HAVE_WCSRTOMBS
    return mbsrtowcs(buf, &psz, n, &mbstate);
#else
    return wxMbstowcs(buf, psz, n);
#endif
  }

#ifdef HAVE_WCSRTOMBS
  return mbsrtowcs((wchar_t *) NULL, &psz, 0, &mbstate);
#else
  return wxMbstowcs((wchar_t *) NULL, psz, 0);
#endif
}

size_t WXDLLEXPORT wxWC2MB(char *buf, const wchar_t *pwz, size_t n)
{
#ifdef HAVE_WCSRTOMBS
  mbstate_t mbstate;
  memset(&mbstate, 0, sizeof(mbstate_t));
#endif

  if (buf) {
    if (!n || !*pwz) {
      // glibc2.1 chokes on null input
      if (n) *buf = '\0';
      return 0;
    }
#ifdef HAVE_WCSRTOMBS
    return wcsrtombs(buf, &pwz, n, &mbstate);
#else
    return wxWcstombs(buf, pwz, n);
#endif
  }

#ifdef HAVE_WCSRTOMBS
  return wcsrtombs((char *) NULL, &pwz, 0, &mbstate);
#else
  return wxWcstombs((char *) NULL, pwz, 0);
#endif
}
#endif // wxUSE_WCHAR_T

bool WXDLLEXPORT wxOKlibc()
{
#if wxUSE_WCHAR_T && defined(__UNIX__) && defined(__GLIBC__) && !defined(__WINE__)
  // glibc 2.0 uses UTF-8 even when it shouldn't
  wchar_t res = 0;
  if ((MB_CUR_MAX == 2) &&
      (wxMB2WC(&res, "\xdd\xa5", 1) == 1) &&
      (res==0x765)) {
    // this is UTF-8 allright, check whether that's what we want
    char *cur_locale = setlocale(LC_CTYPE, NULL);
    if ((strlen(cur_locale) < 4) ||
            (strcasecmp(cur_locale + strlen(cur_locale) - 4, "utf8")) ||
            (strcasecmp(cur_locale + strlen(cur_locale) - 5, "utf-8"))) {
      // nope, don't use libc conversion
      return false;
    }
  }
#endif
  return true;
}

// ============================================================================
// printf() functions business
// ============================================================================

// special test mode: define all functions below even if we don't really need
// them to be able to test them
#ifdef wxTEST_PRINTF
    #undef wxFprintf
    #undef wxPrintf
    #undef wxSprintf
    #undef wxVfprintf
    #undef wxVsprintf
    #undef wxVprintf
    #undef wxVsnprintf_
    #undef wxSnprintf_

    #define wxNEED_WPRINTF

    int wxVfprintf( FILE *stream, const wxChar *format, va_list argptr );
#endif

// ----------------------------------------------------------------------------
// implement [v]snprintf() if the system doesn't provide a safe one
// ----------------------------------------------------------------------------

#if !defined(wxVsnprintf_)
int WXDLLEXPORT wxVsnprintf_(wxChar *buf, size_t lenMax,
                             const wxChar *format, va_list argptr)
{
    // buffer to avoid dynamic memory allocation each time for small strings
    char szScratch[1024];

    // number of characters in the buffer so far, must be less than lenMax
    size_t lenCur = 0;

    for ( size_t n = 0; ; n++ )
    {
        const wxChar chCur = format[n];

        if ( chCur == wxT('%') )
        {
            static char s_szFlags[256] = "%";
            size_t flagofs = 1;
            bool adj_left = false,
                 in_prec = false,
                 prec_dot = false,
                 done = false;
            int ilen = 0;
            size_t min_width = 0,
                   max_width = wxSTRING_MAXLEN;
            do
            {

#define CHECK_PREC \
                if (in_prec && !prec_dot) \
                { \
                    s_szFlags[flagofs++] = '.'; \
                    prec_dot = true; \
                }

#define APPEND_CH(ch) \
                { \
                    if ( lenCur == lenMax ) \
                        return -1; \
                    \
                    buf[lenCur++] = ch; \
                }

#define APPEND_STR(s) \
                { \
                    for ( const wxChar *p = s; *p; p++ ) \
                    { \
                        APPEND_CH(*p); \
                    } \
                }

                // what follows '%'?
                const wxChar ch = format[++n];
                switch ( ch )
                {
                    case wxT('\0'):
                        APPEND_CH(_T('\0'));

                        done = true;
                        break;

                    case wxT('%'):
                        APPEND_CH(_T('%'));
                        done = true;
                        break;

                    case wxT('#'):
                    case wxT('0'):
                    case wxT(' '):
                    case wxT('+'):
                    case wxT('\''):
                        CHECK_PREC
                        s_szFlags[flagofs++] = ch;
                        break;

                    case wxT('-'):
                        CHECK_PREC
                        adj_left = true;
                        s_szFlags[flagofs++] = ch;
                        break;

                    case wxT('.'):
                        CHECK_PREC
                        in_prec = true;
                        prec_dot = false;
                        max_width = 0;
                        // dot will be auto-added to s_szFlags if non-negative
                        // number follows
                        break;

                    case wxT('h'):
                        ilen = -1;
                        CHECK_PREC
                        s_szFlags[flagofs++] = ch;
                        break;

                    case wxT('l'):
                        ilen = 1;
                        CHECK_PREC
                        s_szFlags[flagofs++] = ch;
                        break;

                    case wxT('q'):
                    case wxT('L'):
                        ilen = 2;
                        CHECK_PREC
                        s_szFlags[flagofs++] = ch;
                        break;

                    case wxT('Z'):
                        ilen = 3;
                        CHECK_PREC
                        s_szFlags[flagofs++] = ch;
                        break;

                    case wxT('*'):
                        {
                            int len = va_arg(argptr, int);
                            if (in_prec)
                            {
                                if (len<0) break;
                                CHECK_PREC
                                    max_width = len;
                            }
                            else
                            {
                                if (len<0)
                                {
                                    adj_left = !adj_left;
                                    s_szFlags[flagofs++] = '-';
                                    len = -len;
                                }
                                min_width = len;
                            }
                            flagofs += ::sprintf(s_szFlags+flagofs,"%d",len);
                        }
                        break;

                    case wxT('1'): case wxT('2'): case wxT('3'):
                    case wxT('4'): case wxT('5'): case wxT('6'):
                    case wxT('7'): case wxT('8'): case wxT('9'):
                        {
                            int len = 0;
                            CHECK_PREC
                            while ( (format[n] >= wxT('0')) &&
                                    (format[n] <= wxT('9')) )
                            {
                                s_szFlags[flagofs++] = format[n];
                                len = len*10 + (format[n] - wxT('0'));
                                n++;
                            }

                            if (in_prec)
                                max_width = len;
                            else
                                min_width = len;

                            n--; // the main loop pre-increments n again
                        }
                        break;

                    case wxT('d'):
                    case wxT('i'):
                    case wxT('o'):
                    case wxT('u'):
                    case wxT('x'):
                    case wxT('X'):
                        CHECK_PREC
                        s_szFlags[flagofs++] = ch;
                        s_szFlags[flagofs] = '\0';
                        if (ilen == 0 )
                        {
                            int val = va_arg(argptr, int);
                            ::sprintf(szScratch, s_szFlags, val);
                        }
                        else if (ilen == -1)
                        {
                            // NB: 'short int' value passed through '...'
                            //      is promoted to 'int', so we have to get
                            //      an int from stack even if we need a short
                            short int val = (short int) va_arg(argptr, int);
                            ::sprintf(szScratch, s_szFlags, val);
                        }
                        else if (ilen == 1)
                        {
                            long int val = va_arg(argptr, long int);
                            ::sprintf(szScratch, s_szFlags, val);
                        }
                        else if (ilen == 2)
                        {
#if SIZEOF_LONG_LONG
                            long long int val = va_arg(argptr, long long int);
                            ::sprintf(szScratch, s_szFlags, val);
#else // !long long
                            long int val = va_arg(argptr, long int);
                            ::sprintf(szScratch, s_szFlags, val);
#endif // long long/!long long
                        }
                        else if (ilen == 3)
                        {
                            size_t val = va_arg(argptr, size_t);
                            ::sprintf(szScratch, s_szFlags, val);
                        }

                        {
                            const wxMB2WXbuf tmp =
                                wxConvLibc.cMB2WX(szScratch);
                            APPEND_STR(tmp);
                        }

                        done = true;
                        break;

                    case wxT('e'):
                    case wxT('E'):
                    case wxT('f'):
                    case wxT('g'):
                    case wxT('G'):
                        CHECK_PREC
                        s_szFlags[flagofs++] = ch;
                        s_szFlags[flagofs] = '\0';
                        if (ilen == 2)
                        {
                            long double val = va_arg(argptr, long double);
                            ::sprintf(szScratch, s_szFlags, val);
                        }
                        else
                        {
                            double val = va_arg(argptr, double);
                            ::sprintf(szScratch, s_szFlags, val);
                        }

                        {
                            const wxMB2WXbuf tmp =
                                wxConvLibc.cMB2WX(szScratch);
                            APPEND_STR(tmp);
                        }