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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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mbsnicmp.c
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C/C++ Source or Header
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1998-06-17
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111 lines
/***
*mbsnicmp.c - Compare n characters of strings, ignoring case (MBCS)
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Compare n characters of strings, ignoring case (MBCS)
*
*******************************************************************************/
#ifdef _MBCS
#include <mtdll.h>
#include <cruntime.h>
#include <mbdata.h>
#include <mbctype.h>
#include <string.h>
#include <mbstring.h>
/***
* _mbsnicmp - Compare n characters of strings, ignoring case (MBCS)
*
*Purpose:
* Compares up to n charcters of two strings for lexical order.
* Strings are compared on a character basis, not a byte basis.
* Case of characters is not considered.
*
*Entry:
* unsigned char *s1, *s2 = strings to compare
* size_t n = maximum number of characters to compare
*
*Exit:
* returns <0 if s1 < s2
* returns 0 if s1 == s2
* returns >0 if s1 > s2
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _mbsnicmp(
const unsigned char *s1,
const unsigned char *s2,
size_t n
)
{
unsigned short c1, c2;
if (n==0)
return(0);
if ( _ISNOTMBCP )
return _strnicmp(s1, s2, n);
_mlock(_MB_CP_LOCK);
while (n--) {
c1 = *s1++;
if (_ISLEADBYTE(c1)) {
if (*s1 == '\0')
c1 = 0;
else {
c1 = ((c1<<8) | *s1++);
if ( ((c1 >= _MBUPPERLOW1) && (c1 <= _MBUPPERHIGH1)) )
c1 += _MBCASEDIFF1;
else if ( ((c1 >= _MBUPPERLOW2) && (c1 <= _MBUPPERHIGH2)) )
c1 += _MBCASEDIFF2;
}
}
else
c1 = _mbbtolower(c1);
c2 = *s2++;
if (_ISLEADBYTE(c2)) {
if (*s2 == '\0')
c2 = 0;
else {
c2 = ((c2<<8) | *s2++);
if ( ((c2 >= _MBUPPERLOW1) && (c2 <= _MBUPPERHIGH1)) )
c2 += _MBCASEDIFF1;
else if ( ((c2 >= _MBUPPERLOW2) && (c2 <= _MBUPPERHIGH2)) )
c2 += _MBCASEDIFF2;
}
}
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);
}
}
_munlock(_MB_CP_LOCK);
return(0);
}
#endif /* _MBCS */