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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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mbtolwr.c
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C/C++ Source or Header
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1998-06-17
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2KB
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88 lines
/***
*mbtolwr.c - Convert character to lower case (MBCS).
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Convert character to lower case (MBCS).
*
*******************************************************************************/
#ifdef _MBCS
#if defined (_WIN32)
#include <awint.h>
#endif /* defined (_WIN32) */
#include <cruntime.h>
#include <ctype.h>
#include <mbdata.h>
#include <mbctype.h>
#include <mbstring.h>
/***
* _mbctolower - Convert character to lower case (MBCS)
*
*Purpose:
* If the given character is upper case, convert it to lower case.
* Handles MBCS characters correctly.
*
* Note: Use test against 0x00FF instead of _ISLEADBYTE
* to ensure that we don't call SBCS routine with a two-byte
* value.
*
*Entry:
* unsigned int c = character to convert
*
*Exit:
* Returns converted character
*
*Exceptions:
*
*******************************************************************************/
unsigned int __cdecl _mbctolower (unsigned int c)
{
unsigned char val[2];
#if defined (_WIN32)
unsigned char ret[4];
#endif /* defined (_WIN32) */
if (c > 0x00FF)
{
val[0] = (c >> 8) & 0xFF;
val[1] = c & 0xFF;
if (!_ismbblead(val[0]))
return c;
#if defined (_WIN32)
if (__crtLCMapStringA(__mblcid, LCMAP_LOWERCASE, val, 2,
ret, 2, __mbcodepage, TRUE) == 0)
return c;
c = ret[1];
c += ret[0] << 8;
return c;
#else /* defined (_WIN32) */
if (c >= _MBUPPERLOW1 && c <= _MBUPPERHIGH1)
c += _MBCASEDIFF1;
else if (c >= _MBUPPERLOW2 && c <= _MBUPPERHIGH2)
c += _MBCASEDIFF2;
return c;
#endif /* defined (_WIN32) */
}
else
return (unsigned int)_mbbtolower((int)c);
}
#endif /* _MBCS */