1 /*** 2 *towupper.cpp - convert wide character to upper case 3 * 4 * Copyright (c) Microsoft Corporation. All rights reserved. 5 * 6 *Purpose: 7 * Defines towupper(). 8 * 9 *******************************************************************************/ 10 #include <corecrt_internal.h> 11 #include <ctype.h> 12 #include <locale.h> 13 14 /*** 15 *wint_t _towupper_l(c, ptloci) - convert wide character to upper case 16 * 17 *Purpose: 18 * Multi-thread function only! Non-locking version of towupper. 19 * 20 *Entry: 21 * 22 *Exit: 23 * 24 *Exceptions: 25 * 26 *******************************************************************************/ 27 28 extern "C" wint_t __cdecl _towupper_l( 29 wint_t const c, 30 _locale_t const plocinfo 31 ) 32 { 33 if (c == WEOF) 34 { 35 return c; 36 } 37 38 _LocaleUpdate _loc_update(plocinfo); 39 auto const locinfo = _loc_update.GetLocaleT()->locinfo; 40 41 if (locinfo->_public._locale_lc_codepage == CP_UTF8) 42 { 43 // For 128 <= c < 256, the toupper map would consider the wide character as it is in UTF-8, not UTF-16. 44 // Below 128, UTF-8 and UTF-16 have the same encodings, so we can use the table. 45 if (c < 128) 46 { 47 return _towupper_fast_internal(static_cast<unsigned char>(c), _loc_update.GetLocaleT()); 48 } 49 } 50 else 51 { 52 // For 128 <= c < 256, the toupper map will consider the wide character as it would be in the current narrow code page, 53 // which can lead to unexpected behavior. This behavior is maintained for backwards compatibility. 54 if (c < 256) 55 { 56 return _towupper_fast_internal(static_cast<unsigned char>(c), _loc_update.GetLocaleT()); 57 } 58 59 if (locinfo->locale_name[LC_CTYPE] == nullptr) 60 { 61 // If the locale is C, then the only characters that would be transformed are <256 62 // and have been processed already. 63 return c; 64 } 65 } 66 67 wint_t widechar; 68 if (0 == __acrt_LCMapStringW( 69 locinfo->locale_name[LC_CTYPE], 70 LCMAP_UPPERCASE, 71 (LPCWSTR)&c, 72 1, 73 (LPWSTR)&widechar, 74 1)) 75 { 76 return c; 77 } 78 79 return widechar; 80 } 81 82 /*** 83 *wint_t towupper(c) - convert wide character to upper case 84 * 85 *Purpose: 86 * towupper() returns the uppercase equivalent of its argument 87 * 88 *Entry: 89 * c - wint_t value of character to be converted 90 * 91 *Exit: 92 * if c is a lower case letter, returns wint_t value of upper case 93 * representation of c. otherwise, it returns c. 94 * 95 *Exceptions: 96 * 97 *******************************************************************************/ 98 99 extern "C" wint_t __cdecl towupper ( 100 wint_t c 101 ) 102 { 103 104 return _towupper_l(c, nullptr); 105 } 106