113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
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/***
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*wcsnicmp.c - compare n chars of wide-character strings, ignoring case
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _wcsnicmp() - Compares at most n characters of two wchar_t
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* strings, without regard to case.
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*
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*Revision History:
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* 09-09-91 ETC Created from strnicmp.c and wcsicmp.c.
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* 12-09-91 ETC Use C for neutral locale.
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* 04-07-92 KRS Updated and ripped out _INTL switches.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 04-14-93 CFW Remove locale-sensitive portion.
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* 09-07-93 GJF Fixed bug introduced on 4-14 (return value not was
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* not well-defined if count == 0).
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* 02-07-94 CFW POSIXify.
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* 09-06-94 CFW Remove _INTL switch.
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* 10-25-94 GJF Now works in non-C locales.
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* 09-26-95 GJF New locking macro, and scheme, for functions which
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* reference the locale.
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* 10-11-95 BWT Fix NTSUBSET
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* 08-27-98 GJF Revised multithread support based on threadlocinfo
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* struct.
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#include <cruntime.h>
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#include <string.h>
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#include <ctype.h>
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#include <locale.h>
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#include <setlocal.h>
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#include <mtdll.h>
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/***
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*int _wcsnicmp(first, last, count) - compares count wchar_t of strings,
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* ignore case
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*
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*Purpose:
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* Compare the two strings for lexical order. Stops the comparison
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* when the following occurs: (1) strings differ, (2) the end of the
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* strings is reached, or (3) count characters have been compared.
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* For the purposes of the comparison, upper case characters are
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* converted to lower case (wide-characters).
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*
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*Entry:
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* wchar_t *first, *last - strings to compare
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* size_t count - maximum number of characters to compare
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*
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*Exit:
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* -1 if first < last
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* 0 if first == last
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* 1 if first > last
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* This range of return values may differ from other *cmp/*coll functions.
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _wcsnicmp (
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const wchar_t * first,
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const wchar_t * last,
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size_t count
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)
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{
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wchar_t f,l;
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int result = 0;
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#ifdef _MT
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pthreadlocinfo ptloci = _getptd()->ptlocinfo;
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if ( ptloci != __ptlocinfo )
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ptloci = __updatetlocinfo();
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#endif
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if ( count ) {
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#ifndef _NTSUBSET_
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#ifdef _MT
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if ( ptloci->lc_handle[LC_CTYPE] == _CLOCALEHANDLE ) {
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#else
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if ( __lc_handle[LC_CTYPE] == _CLOCALEHANDLE ) {
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#endif
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#endif /* _NTSUBSET_ */
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do {
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f = __ascii_towlower(*first);
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l = __ascii_towlower(*last);
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first++;
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last++;
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} while ( (--count) && f && (f == l) );
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#ifndef _NTSUBSET_
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}
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else {
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do {
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#ifdef _MT
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f = __towlower_mt( ptloci, (unsigned short)(*(first++)) );
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l = __towlower_mt( ptloci, (unsigned short)(*(last++)) );
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#else
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f = towlower( (unsigned short)(*(first++)) );
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l = towlower( (unsigned short)(*(last++)) );
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#endif
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} while ( (--count) && f && (f == l) );
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}
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#endif /* _NTSUBSET_ */
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result = (int)(f - l);
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}
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return result;
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}
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#endif /* _POSIX_ */
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