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Reactos
1/***
2*mbtolwr.c - Convert character to lower case (MBCS).
3*
4* Copyright (c) Microsoft Corporation. All rights reserved.
5*
6*Purpose:
7* Convert character to lower case (MBCS).
8*
9*******************************************************************************/
10#ifndef _MBCS
11 #error This file should only be compiled with _MBCS defined
12#endif
13
14#include <corecrt_internal_mbstring.h>
15#include <locale.h>
16
17
18/***
19* _mbctolower - Convert character to lower case (MBCS)
20*
21*Purpose:
22* If the given character is upper case, convert it to lower case.
23* Handles MBCS characters correctly.
24*
25* Note: Use test against 0x00FF instead of _ISLEADBYTE
26* to ensure that we don't call SBCS routine with a two-byte
27* value.
28*
29*Entry:
30* unsigned int c = character to convert
31*
32*Exit:
33* Returns converted character
34*
35*Exceptions:
36*
37*******************************************************************************/
38
39extern "C" unsigned int __cdecl _mbctolower_l (
40 unsigned int c,
41 _locale_t plocinfo
42 )
43{
44 unsigned char val[2];
45 unsigned char ret[4];
46 _LocaleUpdate _loc_update(plocinfo);
47
48 if (c > 0x00FF)
49 {
50 val[0] = (c >> 8) & 0xFF;
51 val[1] = c & 0xFF;
52
53 if ( !_ismbblead_l(val[0], _loc_update.GetLocaleT()) )
54 return c;
55
56
57 if ( __acrt_LCMapStringA(
58 _loc_update.GetLocaleT(),
59 _loc_update.GetLocaleT()->mbcinfo->mblocalename,
60 LCMAP_LOWERCASE,
61 (const char *)val,
62 2,
63 (char *)ret,
64 2,
65 _loc_update.GetLocaleT()->mbcinfo->mbcodepage,
66 TRUE ) == 0 )
67 return c;
68
69 c = ret[1];
70 c += ret[0] << 8;
71
72 return c;
73
74
75 }
76 else
77 return (unsigned int)_mbbtolower_l((int)c, _loc_update.GetLocaleT());
78}
79
80extern "C" unsigned int (__cdecl _mbctolower) (
81 unsigned int c
82 )
83{
84 return _mbctolower_l(c, nullptr);
85}