139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/***
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*xwcscoll.c - Collate wide-character locale strings
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*
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* Copyright (c) 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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*******************************************************************************/
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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 <mtdll.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 __CLRCALL_PURE_OR_CDECL _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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_CRTIMP2_PURE int __CLRCALL_PURE_OR_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 = (int)(_end1 - _string1);
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int n2 = (int)(_end2 - _string2);
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int ret=0;
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const wchar_t *locale_name;
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if (ploc == 0)
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locale_name = ___lc_locale_name_func()[LC_COLLATE];
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else
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{
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locale_name = ploc->_LocaleName;
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}
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if (locale_name == NULL)
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{
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int ans;
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ans = _Wmemcmp(_string1, _string2, n1 < n2 ? n1 : n2);
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ret=(ans != 0 || n1 == n2 ? ans : n1 < n2 ? -1 : +1);
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}
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else
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{
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if (0 == (ret = __crtCompareStringW(locale_name,
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SORT_STRINGSORT,
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_string1,
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n1,
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_string2,
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n2)))
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{
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errno = EINVAL;
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ret=_NLSCMPERROR;
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}
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else
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{
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ret-=2;
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}
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}
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return ret;
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}
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#ifdef MRTDLL
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_CRTIMP2_PURE int __CLRCALL_PURE_OR_CDECL _Wcscoll (
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const unsigned short *_string1,
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const unsigned short *_end1,
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const unsigned short *_string2,
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const unsigned short *_end2,
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const _Collvec *ploc
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)
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{
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return _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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ploc);
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}
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#endif /* MRTDLL */
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