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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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wcsnicmp.c
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C/C++ Source or Header
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1998-06-17
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3KB
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84 lines
/***
*wcsnicmp.c - compare n chars of wide-character strings, ignoring case
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines _wcsnicmp() - Compares at most n characters of two wchar_t
* strings, without regard to case.
*
*******************************************************************************/
#include <cruntime.h>
#include <string.h>
#include <ctype.h>
#include <locale.h>
#include <setlocal.h>
#include <mtdll.h>
/***
*int _wcsnicmp(first, last, count) - compares count wchar_t of strings,
* ignore case
*
*Purpose:
* Compare the two strings for lexical order. Stops the comparison
* when the following occurs: (1) strings differ, (2) the end of the
* strings is reached, or (3) count characters have been compared.
* For the purposes of the comparison, upper case characters are
* converted to lower case (wide-characters).
*
*Entry:
* wchar_t *first, *last - strings to compare
* size_t count - maximum number of characters to compare
*
*Exit:
* -1 if first < last
* 0 if first == last
* 1 if first > last
* This range of return values may differ from other *cmp/*coll functions.
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _wcsnicmp (
const wchar_t * first,
const wchar_t * last,
size_t count
)
{
wchar_t f,l;
int result = 0;
#if defined (_MT)
int local_lock_flag;
#endif /* defined (_MT) */
if ( count ) {
if ( __lc_handle[LC_CTYPE] == _CLOCALEHANDLE ) {
do {
f = ((*first <= L'Z') && (*first >= L'A'))
? *first - L'A' + L'a'
: *first;
l = ((*last <= L'Z') && (*last >= L'A'))
? *last - L'A' + L'a'
: *last;
first++;
last++;
} while ( (--count) && f && (f == l) );
}
else {
_lock_locale( local_lock_flag )
do {
f = _towlower_lk( (unsigned short)(*(first++)) );
l = _towlower_lk( (unsigned short)(*(last++)) );
} while ( (--count) && f && (f == l) );
_unlock_locale( local_lock_flag )
}
result = (int)(f - l);
}
return result;
}