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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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mbsicmp.c
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C/C++ Source or Header
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1998-06-17
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140 lines
/***
*mbsicmp.c - Case-insensitive string comparision routine (MBCS)
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Case-insensitive string comparision routine (MBCS)
*
*******************************************************************************/
#ifdef _MBCS
#if defined (_WIN32)
#include <awint.h>
#endif /* defined (_WIN32) */
#include <mtdll.h>
#include <cruntime.h>
#include <mbdata.h>
#include <mbctype.h>
#include <string.h>
#include <mbstring.h>
/***
* _mbsicmp - Case-insensitive string comparision routine (MBCS)
*
*Purpose:
* Compares two strings for lexical order without regard to case.
* Strings are compared on a character basis, not a byte basis.
*
*Entry:
* char *s1, *s2 = strings to compare
*
*Exit:
* returns <0 if s1 < s2
* returns 0 if s1 == s2
* returns >0 if s1 > s2
* returns _NLSCMPERROR if NLS error
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _mbsicmp (const unsigned char *s1, const unsigned char *s2)
{
unsigned short c1, c2;
#if defined (_WIN32)
int retval;
unsigned char szResult[4];
#endif /* defined (_WIN32) */
if ( _ISNOTMBCP )
return _stricmp(s1, s2);
_mlock(_MB_CP_LOCK);
for (;;)
{
c1 = *s1++;
if (_ISLEADBYTE(c1))
{
if (*s1 == '\0')
c1 = 0;
else
{
#if defined (_WIN32)
retval = __crtLCMapStringA(__mblcid, LCMAP_UPPERCASE,
s1 - 1, 2, szResult, 2,
__mbcodepage, TRUE);
if (retval == 1)
c1 = szResult[0];
else if (retval == 2)
c1 = (szResult[0] << 8) + szResult[1];
else
{
_munlock(_MB_CP_LOCK);
return _NLSCMPERROR;
}
s1++;
#else /* defined (_WIN32) */
c1 = ((c1 << 8) | *s1++);
if (c1 >= _MBUPPERLOW1 && c1 <= _MBUPPERHIGH1)
c1 += _MBCASEDIFF1;
else if (c1 >= _MBUPPERLOW2 && c1 <= _MBUPPERHIGH2)
c1 += _MBCASEDIFF2;
#endif /* defined (_WIN32) */
}
}
else
c1 = _mbbtolower(c1);
c2 = *s2++;
if (_ISLEADBYTE(c2))
{
if (*s2 == '\0')
c2 = 0;
else
{
#if defined (_WIN32)
retval = __crtLCMapStringA(__mblcid, LCMAP_UPPERCASE,
s2 - 1, 2, szResult, 2,
__mbcodepage, TRUE);
if (retval == 1)
c2 = szResult[0];
else if (retval == 2)
c2 = (szResult[0] << 8) + szResult[1];
else
{
_munlock(_MB_CP_LOCK);
return _NLSCMPERROR;
}
s2++;
#else /* defined (_WIN32) */
c2 = ((c2 << 8) | *s2++);
if (c2 >= _MBUPPERLOW1 && c2 <= _MBUPPERHIGH1)
c2 += _MBCASEDIFF1;
else if (c2 >= _MBUPPERLOW2 && c2 <= _MBUPPERHIGH2)
c2 += _MBCASEDIFF2;
#endif /* defined (_WIN32) */
}
}
else
c2 = _mbbtolower(c2);
if (c1 != c2)
{
_munlock(_MB_CP_LOCK);
return( (c1 > c2) ? 1 : -1 );
}
if (c1 == 0)
{
_munlock(_MB_CP_LOCK);
return(0);
}
}
}
#endif /* _MBCS */