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106 lines
2.4 KiB
106 lines
2.4 KiB
/***
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*mbtolwr.c - Convert character to lower case (MBCS).
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*
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* Copyright (c) 1985-1994, 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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*Revision History:
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* 11-19-92 KRS Ported from 16-bit sources.
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* 08-20-93 CFW Change short params to int for 32-bit tree.
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* 09-29-93 CFW Merge _KANJI and _MBCS_OS
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* 10-06-93 GJF Replaced _CRTAPI1 with __cdecl.
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* 04-12-94 CFW Make function generic.
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* 04-21-94 CFW Return bad chars unchanged.
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* 05-16-94 CFW Use _mbbtolower/upper.
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* 05-17-94 CFW Enable non-Win32.
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*
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*******************************************************************************/
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#ifdef _MBCS
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#ifdef _WIN32
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#include <awint.h>
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#endif /* _WIN32 */
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#include <cruntime.h>
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#include <ctype.h>
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#include <mbdata.h>
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#include <mbctype.h>
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#include <mbstring.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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unsigned int __cdecl _mbctolower(
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unsigned int c
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)
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{
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unsigned char val[2];
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#if defined(_WIN32) && !defined(_POSIX_)
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unsigned char ret[4];
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#endif /* _WIN32 */
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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(val[0]))
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return c;
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#if defined(_WIN32) && !defined(_POSIX_)
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if (__crtLCMapStringA( __mblcid,
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LCMAP_LOWERCASE,
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val,
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2,
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ret,
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2,
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__mbcodepage) == 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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#else /* _WIN32 */
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if (c >= _MBUPPERLOW1 && c <= _MBUPPERHIGH1)
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c += _MBCASEDIFF1;
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else if (c >= _MBUPPERLOW2 && c <= _MBUPPERHIGH2)
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c += _MBCASEDIFF2;
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return c;
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#endif /* _WIN32 */
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} else
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return (unsigned int)_mbbtolower((int)c);
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}
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#endif /* _MBCS */
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