129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
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/***
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*xwcscoll.c - Collate wide-character locale strings
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*
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* Copyright (c) 1996-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Compare two wchar_t strings using the locale LC_COLLATE information.
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*
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*Revision History:
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* 01-XX-96 GJF Created from wcscoll.c January 1996 by P.J. Plauger
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* 04-18-96 GJF Updated for current locale locking. Also, reformatted
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* and made several cosmetic changes.
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* 12-02-97 GJF Removed bogus codepage determination.
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* 01-12-98 GJF Use _lc_collate_cp codepage.
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* 01-05-99 GJF Changes for 64-bit size_t.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <windows.h>
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#include <stdlib.h>
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#include <string.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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#include <errno.h>
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#include <awint.h>
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#include <xlocinfo.h> /* for _Collvec, _Wcscoll */
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/***
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*static int _Wmemcmp(s1, s2, n) - compare wchar_t s1[n], s2[n]
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*
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*Purpose:
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*
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*Entry:
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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static int _Wmemcmp(
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const wchar_t *s1,
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const wchar_t *s2,
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int n
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)
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{
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for (; 0 < n; ++s1, ++s2, --n)
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if (*s1 != *s2)
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return (*s1 < *s2 ? -1 : +1);
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return (0);
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}
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/***
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*int _Wcscoll() - Collate wide-character locale strings
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*
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*Purpose:
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* Compare two wchar_t strings using the locale LC_COLLATE information.
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* In the C locale, wcscmp() is used to make the comparison.
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*
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*Entry:
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* const wchar_t *_string1 = pointer to beginning of the first string
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* const wchar_t *_end1 = pointer past end of the first string
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* const wchar_t *_string2 = pointer to beginning of the second string
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* const wchar_t *_end2 = pointer past end of the second string
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* const _Collvec *ploc = pointer to locale info
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*
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*Exit:
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* -1 = first string less than second string
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* 0 = strings are equal
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* 1 = first string greater than second string
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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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* _NLSCMPERROR = error
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* errno = EINVAL
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*
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*******************************************************************************/
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int __cdecl _Wcscoll (
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const wchar_t *_string1,
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const wchar_t *_end1,
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const wchar_t *_string2,
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const wchar_t *_end2,
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const _Collvec *ploc
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)
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{
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int n1 = _end1 - _string1;
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int n2 = _end2 - _string2;
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int ret;
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LCID handle;
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#ifdef _MT
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int local_lock_flag;
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_lock_locale( local_lock_flag )
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#endif
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if (ploc == 0)
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handle = __lc_handle[LC_COLLATE];
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else
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handle = ploc->_Hand;
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if (handle == _CLOCALEHANDLE) {
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int ans;
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_unlock_locale( local_lock_flag )
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ans = _Wmemcmp(_string1, _string2, n1 < n2 ? n1 : n2);
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return ans != 0 || n1 == n2 ? ans : n1 < n2 ? -1 : +1;
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}
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if (0 == (ret = __crtCompareStringW(handle,
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0,
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_string1,
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n1,
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_string2,
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n2,
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__lc_collate_cp)))
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{
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_unlock_locale( local_lock_flag )
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errno = EINVAL;
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return _NLSCMPERROR;
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}
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_unlock_locale( local_lock_flag )
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return (ret - 2);
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}
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