include/wx/wxcrtvararg.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/wxcrtvararg.h
   3 // Purpose:     Type-safe ANSI and Unicode builds compatible wrappers for
   4 //              printf(), scanf() and related CRT functions
   5 // Author:      Joel Farley, Ove Kåven
   6 // Modified by: Vadim Zeitlin, Robert Roebling, Ron Lee
   7 // Created:     2007-02-19
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) 2007 REA Elektronik GmbH
  10 // Licence:     wxWindows licence
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef _WX_WXCRTVARARG_H_
  14 #define _WX_WXCRTVARARG_H_
  15
  16 // NB: User code should include wx/crt.h instead of including this
  17 //     header directly.
  18
  19 #include "wx/wxcrt.h"
  20 #include "wx/strvararg.h"
  21
  22 #include "wx/string.h"
  23
  24 // ----------------------------------------------------------------------------
  25 // CRT functions aliases
  26 // ----------------------------------------------------------------------------
  27
  28 /* Required for wxPrintf() etc */
  29 #include <stdarg.h>
  30
  31 /* printf() family saga */
  32
  33 /*
  34    For some systems [v]snprintf() exists in the system libraries but not in the
  35    headers, so we need to declare it ourselves to be able to use it.
  36  */
  37 #if defined(HAVE_VSNPRINTF) && !defined(HAVE_VSNPRINTF_DECL)
  38 #ifdef __cplusplus
  39     extern "C"
  40 #else
  41     extern
  42 #endif
  43     int vsnprintf(char *str, size_t size, const char *format, va_list ap);
  44 #endif /* !HAVE_VSNPRINTF_DECL */
  45
  46 #if defined(HAVE_SNPRINTF) && !defined(HAVE_SNPRINTF_DECL)
  47 #ifdef __cplusplus
  48     extern "C"
  49 #else
  50     extern
  51 #endif
  52     int snprintf(char *str, size_t size, const char *format, ...);
  53 #endif /* !HAVE_SNPRINTF_DECL */
  54
  55 /* Wrapper for vsnprintf if it's 3rd parameter is non-const. Note: the
  56  * same isn't done for snprintf below, the builtin wxSnprintf_ is used
  57  * instead since it's already a simple wrapper */
  58 #if defined __cplusplus && defined HAVE_BROKEN_VSNPRINTF_DECL
  59     inline int wx_fixed_vsnprintf(char *str, size_t size, const char *format, va_list ap)
  60     {
  61         return vsnprintf(str, size, (char*)format, ap);
  62     }
  63 #endif
  64
  65 /*
  66    MinGW MSVCRT has non-standard vswprintf() (for MSVC compatibility
  67    presumably) and normally _vsnwprintf() is used instead
  68  */
  69 #if defined(HAVE_VSWPRINTF) && defined(__MINGW32__)
  70     #undef HAVE_VSWPRINTF
  71 #endif
  72
  73 #if defined(__WATCOMC__)
  74     #define HAVE_VSWPRINTF 1
  75 #endif
  76
  77 #if wxUSE_PRINTF_POS_PARAMS
  78     /*
  79         The systems where vsnprintf() supports positional parameters should
  80         define the HAVE_UNIX98_PRINTF symbol.
  81
  82         On systems which don't (e.g. Windows) we are forced to use
  83         our wxVsnprintf() implementation.
  84     */
  85     #if defined(HAVE_UNIX98_PRINTF)
  86         #ifdef HAVE_VSWPRINTF
  87             #define wxCRT_VsnprintfW   vswprintf
  88         #endif
  89         #ifdef HAVE_BROKEN_VSNPRINTF_DECL
  90             #define wxCRT_VsnprintfA    wx_fixed_vsnprintf
  91         #else
  92             #define wxCRT_VsnprintfA    vsnprintf
  93         #endif
  94     #else /* !HAVE_UNIX98_PRINTF */
  95         /*
  96             The only compiler with positional parameters support under Windows
  97             is VC++ 8.0 which provides a new xxprintf_p() functions family.
  98             The 2003 PSDK includes a slightly earlier version of VC8 than the
  99             main release and does not have the printf_p functions.
 100          */
 101         #if defined _MSC_FULL_VER && _MSC_FULL_VER >= 140050727 && !defined __WXWINCE__
 102             #define wxCRT_VsnprintfA    _vsprintf_p
 103             #define wxCRT_VsnprintfW    _vswprintf_p
 104         #endif
 105     #endif /* HAVE_UNIX98_PRINTF/!HAVE_UNIX98_PRINTF */
 106 #else /* !wxUSE_PRINTF_POS_PARAMS */
 107     /*
 108        We always want to define safe snprintf() function to be used instead of
 109        sprintf(). Some compilers already have it (or rather vsnprintf() which
 110        we really need...), otherwise we implement it using our own printf()
 111        code.
 112
 113        We define function with a trailing underscore here because the real one
 114        is a wrapper around it as explained below
 115      */
 116
 117     #if defined(__VISUALC__) || \
 118             (defined(__BORLANDC__) && __BORLANDC__ >= 0x540)
 119         #define wxCRT_VsnprintfA    _vsnprintf
 120         #define wxCRT_VsnprintfW    _vsnwprintf
 121     #else
 122         #if defined(HAVE__VSNWPRINTF)
 123             #define wxCRT_VsnprintfW    _vsnwprintf
 124         #elif defined(HAVE_VSWPRINTF)
 125             #define wxCRT_VsnprintfW     vswprintf
 126         #elif defined(__WATCOMC__)
 127             #define wxCRT_VsnprintfW    _vsnwprintf
 128         #endif
 129
 130         /*
 131            All versions of CodeWarrior supported by wxWidgets apparently
 132            have both snprintf() and vsnprintf()
 133          */
 134         #if defined(HAVE_VSNPRINTF) \
 135             || defined(__MWERKS__) || defined(__WATCOMC__)
 136             #ifdef HAVE_BROKEN_VSNPRINTF_DECL
 137                 #define wxCRT_VsnprintfA    wx_fixed_vsnprintf
 138             #else
 139                 #define wxCRT_VsnprintfA    vsnprintf
 140             #endif
 141         #endif
 142     #endif
 143 #endif /* wxUSE_PRINTF_POS_PARAMS/!wxUSE_PRINTF_POS_PARAMS */
 144
 145 #ifndef wxCRT_VsnprintfW
 146     /* no (suitable) vsnprintf(), cook our own */
 147     WXDLLIMPEXP_BASE int
 148     wxCRT_VsnprintfW(wchar_t *buf, size_t len, const wchar_t *format, va_list argptr);
 149     #define wxUSE_WXVSNPRINTFW 1
 150 #else
 151     #define wxUSE_WXVSNPRINTFW 0
 152 #endif
 153
 154 #ifndef wxCRT_VsnprintfA
 155         /* no (suitable) vsnprintf(), cook our own */
 156         WXDLLIMPEXP_BASE int
 157         wxCRT_VsnprintfA(char *buf, size_t len, const char *format, va_list argptr);
 158         #define wxUSE_WXVSNPRINTFA 1
 159 #else
 160         #define wxUSE_WXVSNPRINTFA 0
 161 #endif
 162
 163 // for wxString code, define wxUSE_WXVSNPRINTF to indicate that wx
 164 // implementation is used no matter what (in UTF-8 build, either *A or *W
 165 // version may be called):
 166 #if !wxUSE_UNICODE
 167     #define wxUSE_WXVSNPRINTF wxUSE_WXVSNPRINTFA
 168 #elif wxUSE_UNICODE_WCHAR
 169     #define wxUSE_WXVSNPRINTF wxUSE_WXVSNPRINTFW
 170 #elif wxUSE_UTF8_LOCALE_ONLY
 171     #define wxUSE_WXVSNPRINTF wxUSE_WXVSNPRINTFA
 172 #else // UTF-8 under any locale
 173     #define wxUSE_WXVSNPRINTF (wxUSE_WXVSNPRINTFA && wxUSE_WXVSNPRINTFW)
 174 #endif
 175
 176 #define wxCRT_FprintfA       fprintf
 177 #define wxCRT_PrintfA        printf
 178 #define wxCRT_VfprintfA      vfprintf
 179 #define wxCRT_VprintfA       vprintf
 180 #define wxCRT_VsprintfA      vsprintf
 181
 182 #define  wxCRT_FprintfW      fwprintf
 183 #define  wxCRT_PrintfW       wprintf
 184 #define  wxCRT_VfprintfW     vfwprintf
 185 #define  wxCRT_VprintfW      vwprintf
 186
 187 #if defined(__WINDOWS__) && !defined(HAVE_VSWPRINTF)
 188 // only non-standard vswprintf() without buffer size argument can be used here
 189 #define  wxCRT_VsprintfW     vswprintf
 190 #endif
 191
 192 /*
 193    In Unicode mode we need to have all standard functions such as wprintf() and
 194    so on but not all systems have them so use our own implementations in this
 195    case.
 196  */
 197 #if wxUSE_UNICODE && !defined(wxHAVE_TCHAR_SUPPORT) && !defined(HAVE_WPRINTF)
 198     #define wxNEED_WPRINTF
 199 #endif
 200
 201
 202 #if defined(wxNEED_WPRINTF)
 203     /*
 204         we need to implement all wide character printf functions either because
 205         we don't have them at all or because they don't have the semantics we
 206         need
 207      */
 208     int wxCRT_PrintfW( const wchar_t *format, ... );
 209     int wxCRT_FprintfW( FILE *stream, const wchar_t *format, ... );
 210     int wxCRT_VfprintfW( FILE *stream, const wchar_t *format, va_list ap );
 211     int wxCRT_VprintfW( const wchar_t *format, va_list ap );
 212     int wxCRT_VsprintfW( wchar_t *str, const wchar_t *format, va_list ap );
 213 #endif /* wxNEED_WPRINTF */
 214
 215
 216 /* Required for wxScanf() etc. */
 217 #define wxCRT_ScanfA     scanf
 218 #define wxCRT_SscanfA    sscanf
 219 #define wxCRT_FscanfA    fscanf
 220 #define wxCRT_VsscanfA   vsscanf
 221
 222 #if defined(wxNEED_WPRINTF)
 223     int wxCRT_ScanfW(const wchar_t *format, ...);
 224     int wxCRT_SscanfW(const wchar_t *str, const wchar_t *format, ...);
 225     int wxCRT_FscanfW(FILE *stream, const wchar_t *format, ...);
 226     int wxCRT_VsscanfW(const wchar_t *str, const wchar_t *format, va_list ap);
 227 #else
 228     #define wxCRT_ScanfW     wscanf
 229     #define wxCRT_SscanfW    swscanf
 230     #define wxCRT_FscanfW    fwscanf
 231     #define wxCRT_VsscanfW   vswscanf
 232 #endif
 233
 234 // ----------------------------------------------------------------------------
 235 // user-friendly wrappers to CRT functions
 236 // ----------------------------------------------------------------------------
 237
 238 #ifdef __WATCOMC__
 239     // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
 240     #define wxPrintf    wxPrintf_Impl
 241     #define wxFprintf   wxFprintf_Impl
 242     #define wxSprintf   wxSprintf_Impl
 243     #define wxSnprintf  wxSnprintf_Impl
 244 #endif
 245
 246     // FIXME-UTF8: remove this
 247 #if wxUSE_UNICODE
 248     #define wxCRT_PrintfNative wxCRT_PrintfW
 249     #define wxCRT_FprintfNative wxCRT_FprintfW
 250 #else
 251     #define wxCRT_PrintfNative wxCRT_PrintfA
 252     #define wxCRT_FprintfNative wxCRT_FprintfA
 253 #endif
 254
 255 WX_DEFINE_VARARG_FUNC(int, wxPrintf, 1, (const wxFormatString&),
 256                       wxCRT_PrintfNative, wxCRT_PrintfA)
 257 WX_DEFINE_VARARG_FUNC(int, wxFprintf, 2, (FILE*, const wxFormatString&),
 258                       wxCRT_FprintfNative, wxCRT_FprintfA)
 259
 260 // va_list versions of printf functions simply forward to the respective
 261 // CRT function; note that they assume that va_list was created using
 262 // wxArgNormalizer<T>!
 263 #if wxUSE_UNICODE_UTF8
 264     #if wxUSE_UTF8_LOCALE_ONLY
 265         #define WX_VARARG_VFOO_IMPL(args, implW, implA)              \
 266             return implA args
 267     #else
 268         #define WX_VARARG_VFOO_IMPL(args, implW, implA)              \
 269             if ( wxLocaleIsUtf8 ) return implA args;                 \
 270             else return implW args
 271     #endif
 272 #elif wxUSE_UNICODE_WCHAR
 273     #define WX_VARARG_VFOO_IMPL(args, implW, implA)                  \
 274         return implW args
 275 #else // ANSI
 276     #define WX_VARARG_VFOO_IMPL(args, implW, implA)                  \
 277         return implA args
 278 #endif
 279
 280 inline int
 281 wxVprintf(const wxString& format, va_list ap)
 282 {
 283     WX_VARARG_VFOO_IMPL((wxFormatString(format), ap),
 284                         wxCRT_VprintfW, wxCRT_VprintfA);
 285 }
 286
 287 inline int
 288 wxVfprintf(FILE *f, const wxString& format, va_list ap)
 289 {
 290     WX_VARARG_VFOO_IMPL((f, wxFormatString(format), ap),
 291                         wxCRT_VfprintfW, wxCRT_VfprintfA);
 292 }
 293
 294 #undef WX_VARARG_VFOO_IMPL
 295
 296
 297 // wxSprintf() and friends have to be implemented in two forms, one for
 298 // writing to char* buffer and one for writing to wchar_t*:
 299
 300 #if !wxUSE_UTF8_LOCALE_ONLY
 301 int WXDLLIMPEXP_BASE wxDoSprintfWchar(char *str, const wxChar *format, ...);
 302 #endif
 303 #if wxUSE_UNICODE_UTF8
 304 int WXDLLIMPEXP_BASE wxDoSprintfUtf8(char *str, const char *format, ...);
 305 #endif
 306 WX_DEFINE_VARARG_FUNC(int, wxSprintf, 2, (char*, const wxFormatString&),
 307                       wxDoSprintfWchar, wxDoSprintfUtf8)
 308
 309 int WXDLLIMPEXP_BASE
 310 wxVsprintf(char *str, const wxString& format, va_list argptr);
 311
 312 #if !wxUSE_UTF8_LOCALE_ONLY
 313 int WXDLLIMPEXP_BASE wxDoSnprintfWchar(char *str, size_t size, const wxChar *format, ...);
 314 #endif
 315 #if wxUSE_UNICODE_UTF8
 316 int WXDLLIMPEXP_BASE wxDoSnprintfUtf8(char *str, size_t size, const char *format, ...);
 317 #endif
 318 WX_DEFINE_VARARG_FUNC(int, wxSnprintf, 3, (char*, size_t, const wxFormatString&),
 319                       wxDoSnprintfWchar, wxDoSnprintfUtf8)
 320
 321 int WXDLLIMPEXP_BASE
 322 wxVsnprintf(char *str, size_t size, const wxString& format, va_list argptr);
 323
 324 #if wxUSE_UNICODE
 325
 326 #if !wxUSE_UTF8_LOCALE_ONLY
 327 int WXDLLIMPEXP_BASE wxDoSprintfWchar(wchar_t *str, const wxChar *format, ...);
 328 #endif
 329 #if wxUSE_UNICODE_UTF8
 330 int WXDLLIMPEXP_BASE wxDoSprintfUtf8(wchar_t *str, const char *format, ...);
 331 #endif
 332 WX_DEFINE_VARARG_FUNC(int, wxSprintf, 2, (wchar_t*, const wxFormatString&),
 333                       wxDoSprintfWchar, wxDoSprintfUtf8)
 334
 335 int WXDLLIMPEXP_BASE
 336 wxVsprintf(wchar_t *str, const wxString& format, va_list argptr);
 337
 338 #if !wxUSE_UTF8_LOCALE_ONLY
 339 int WXDLLIMPEXP_BASE wxDoSnprintfWchar(wchar_t *str, size_t size, const wxChar *format, ...);
 340 #endif
 341 #if wxUSE_UNICODE_UTF8
 342 int WXDLLIMPEXP_BASE wxDoSnprintfUtf8(wchar_t *str, size_t size, const char *format, ...);
 343 #endif
 344 WX_DEFINE_VARARG_FUNC(int, wxSnprintf, 3, (wchar_t*, size_t, const wxFormatString&),
 345                       wxDoSnprintfWchar, wxDoSnprintfUtf8)
 346
 347 int WXDLLIMPEXP_BASE
 348 wxVsnprintf(wchar_t *str, size_t size, const wxString& format, va_list argptr);
 349
 350 #endif // wxUSE_UNICODE
 351
 352 #ifdef __WATCOMC__
 353     // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
 354     //
 355     // fortunately, OpenWatcom implements __VA_ARGS__, so we can provide macros
 356     // that cast the format argument to wxString:
 357     #undef wxPrintf
 358     #undef wxFprintf
 359     #undef wxSprintf
 360     #undef wxSnprintf
 361
 362     #define wxPrintf(fmt, ...) \
 363             wxPrintf_Impl(wxFormatString(fmt), __VA_ARGS__)
 364     #define wxFprintf(f, fmt, ...) \
 365             wxFprintf_Impl(f, wxFormatString(fmt), __VA_ARGS__)
 366     #define wxSprintf(s, fmt, ...) \
 367             wxSprintf_Impl(s, wxFormatString(fmt), __VA_ARGS__)
 368     #define wxSnprintf(s, n, fmt, ...) \
 369             wxSnprintf_Impl(s, n, wxFormatString(fmt), __VA_ARGS__)
 370 #endif // __WATCOMC__
 371
 372
 373 // We can't use wxArgNormalizer<T> for variadic arguments to wxScanf() etc.
 374 // because they are writable, so instead of providing friendly template
 375 // vararg-like functions, we just provide both char* and wchar_t* variants
 376 // of these functions. The type of output variadic arguments for %s must match
 377 // the type of 'str' and 'format' arguments.
 378 //
 379 // For compatibility with earlier wx versions, we also provide wxSscanf()
 380 // version with the first argument (input string) wxString; for this version,
 381 // the type of output string values is determined by the type of format string
 382 // only.
 383
 384 #define _WX_SCANFUNC_EXTRACT_ARGS_1(x)   x
 385 #define _WX_SCANFUNC_EXTRACT_ARGS_2(x,y) x, y
 386 #define _WX_SCANFUNC_EXTRACT_ARGS(N, args) _WX_SCANFUNC_EXTRACT_ARGS_##N args
 387
 388 #define _WX_VARARG_PASS_WRITABLE(i) a##i
 389
 390 #define _WX_DEFINE_SCANFUNC(N, dummy1, name, impl, passfixed, numfixed, fixed)\
 391     template<_WX_VARARG_JOIN(N, _WX_VARARG_TEMPL)>                            \
 392     int name(_WX_SCANFUNC_EXTRACT_ARGS(numfixed, fixed),                      \
 393              _WX_VARARG_JOIN(N, _WX_VARARG_ARG))                              \
 394     {                                                                         \
 395         return  impl(_WX_SCANFUNC_EXTRACT_ARGS(numfixed, passfixed),          \
 396                      _WX_VARARG_JOIN(N, _WX_VARARG_PASS_WRITABLE));           \
 397     }
 398
 399 #define WX_DEFINE_SCANFUNC(name, numfixed, fixed, impl, passfixed)            \
 400     inline int name(_WX_SCANFUNC_EXTRACT_ARGS(numfixed, fixed))               \
 401     {                                                                         \
 402         return impl(_WX_SCANFUNC_EXTRACT_ARGS(numfixed, passfixed));          \
 403     }                                                                         \
 404     _WX_VARARG_ITER(_WX_VARARG_MAX_ARGS,                                      \
 405                     _WX_DEFINE_SCANFUNC,                                      \
 406                     dummy1, name, impl, passfixed, numfixed, fixed)
 407
 408 // this is needed to normalize the format string, see src/common/strvararg.cpp
 409 // for more details
 410 #ifdef __WINDOWS__
 411     #define wxScanfConvertFormatW(fmt) fmt
 412 #else
 413     const wxWCharBuffer
 414     WXDLLIMPEXP_BASE wxScanfConvertFormatW(const wchar_t *format);
 415 #endif
 416
 417 WX_DEFINE_SCANFUNC(wxScanf, 1, (const char *format),
 418                    wxCRT_ScanfA, (format))
 419 WX_DEFINE_SCANFUNC(wxScanf, 1, (const wchar_t *format),
 420                    wxCRT_ScanfW, (wxScanfConvertFormatW(format)))
 421
 422 WX_DEFINE_SCANFUNC(wxFscanf, 2, (FILE *stream, const char *format),
 423                    wxCRT_FscanfA, (stream, format))
 424 WX_DEFINE_SCANFUNC(wxFscanf, 2, (FILE *stream, const wchar_t *format),
 425                    wxCRT_FscanfW, (stream, wxScanfConvertFormatW(format)))
 426
 427 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const char *str, const char *format),
 428                    wxCRT_SscanfA, (str, format))
 429 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const wchar_t *str, const wchar_t *format),
 430                    wxCRT_SscanfW, (str, wxScanfConvertFormatW(format)))
 431 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const wxCharBuffer& str, const char *format),
 432                    wxCRT_SscanfA, (str.data(), format))
 433 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const wxWCharBuffer& str, const wchar_t *format),
 434                    wxCRT_SscanfW, (str.data(), wxScanfConvertFormatW(format)))
 435 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const wxString& str, const char *format),
 436                    wxCRT_SscanfA, (str.mb_str(), format))
 437 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const wxString& str, const wchar_t *format),
 438                    wxCRT_SscanfW, (str.wc_str(), wxScanfConvertFormatW(format)))
 439 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const wxCStrData& str, const char *format),
 440                    wxCRT_SscanfA, (str.AsCharBuf(), format))
 441 WX_DEFINE_SCANFUNC(wxSscanf, 2, (const wxCStrData& str, const wchar_t *format),
 442                    wxCRT_SscanfW, (str.AsWCharBuf(), wxScanfConvertFormatW(format)))
 443
 444 // Visual C++ doesn't provide vsscanf()
 445 #ifndef __VISUALC___
 446 int WXDLLIMPEXP_BASE wxVsscanf(const char *str, const char *format, va_list ap);
 447 int WXDLLIMPEXP_BASE wxVsscanf(const wchar_t *str, const wchar_t *format, va_list ap);
 448 int WXDLLIMPEXP_BASE wxVsscanf(const wxCharBuffer& str, const char *format, va_list ap);
 449 int WXDLLIMPEXP_BASE wxVsscanf(const wxWCharBuffer& str, const wchar_t *format, va_list ap);
 450 int WXDLLIMPEXP_BASE wxVsscanf(const wxString& str, const char *format, va_list ap);
 451 int WXDLLIMPEXP_BASE wxVsscanf(const wxString& str, const wchar_t *format, va_list ap);
 452 int WXDLLIMPEXP_BASE wxVsscanf(const wxCStrData& str, const char *format, va_list ap);
 453 int WXDLLIMPEXP_BASE wxVsscanf(const wxCStrData& str, const wchar_t *format, va_list ap);
 454 #endif // !__VISUALC__
 455
 456 #endif /* _WX_WXCRTVARARG_H_ */