mirror of
https://github.com/Chuyu-Team/VC-LTL5.git
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mingkuang
95 lines
2.2 KiB
C++
95 lines
2.2 KiB
C++
/***
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*mbtolwr.c - Convert character to lower case (MBCS).
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Convert character to lower case (MBCS).
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*
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*******************************************************************************/
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#ifndef _MBCS
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#error This file should only be compiled with _MBCS defined
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#endif
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#include <corecrt_internal_mbstring.h>
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#include <locale.h>
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/***
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* _mbctolower - Convert character to lower case (MBCS)
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*
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*Purpose:
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* If the given character is upper case, convert it to lower case.
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* Handles MBCS characters correctly.
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*
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* Note: Use test against 0x00FF instead of _ISLEADBYTE
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* to ensure that we don't call SBCS routine with a two-byte
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* value.
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*
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*Entry:
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* unsigned int c = character to convert
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*
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*Exit:
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* Returns converted character
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*
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*Exceptions:
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*
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*******************************************************************************/
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
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extern "C" unsigned int __cdecl _mbctolower_l (
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unsigned int c,
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_locale_t plocinfo
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)
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{
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if (!plocinfo)
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return _mbctolower(c);
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unsigned char val[2];
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unsigned char ret[4];
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//_LocaleUpdate _loc_update(plocinfo);
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if (c > 0x00FF)
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{
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val[0] = (c >> 8) & 0xFF;
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val[1] = c & 0xFF;
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if ( !_ismbblead_l(val[0], plocinfo) )
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return c;
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if ( __acrt_LCMapStringA(
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plocinfo,
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plocinfo->mbcinfo->mblcid,
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LCMAP_LOWERCASE,
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(const char *)val,
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2,
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(char *)ret,
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2,
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plocinfo->mbcinfo->mbcodepage,
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TRUE ) == 0 )
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return c;
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c = ret[1];
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c += ret[0] << 8;
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return c;
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}
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else
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return (unsigned int)_mbbtolower_l((int)c, plocinfo);
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}
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_LCRT_DEFINE_IAT_SYMBOL(_mbctolower_l);
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#endif
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#if 0
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extern "C" unsigned int (__cdecl _mbctolower) (
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unsigned int c
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)
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{
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return _mbctolower_l(c, nullptr);
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}
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#endif
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