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Reactos
1/***
2*mbsncol.c - Collate n characters of two MBCS strings
3*
4* Copyright (c) Microsoft Corporation. All rights reserved.
5*
6*Purpose:
7* Collate n characters of two MBCS strings
8*
9*******************************************************************************/
10#ifndef _MBCS
11 #error This file should only be compiled with _MBCS defined
12#endif
13
14#include <corecrt_internal_mbstring.h>
15#include <limits.h>
16#include <locale.h>
17#include <string.h>
18
19/***
20* _mbsncoll(s1, s2, n) - Collate n characters of two MBCS strings
21*
22*Purpose:
23* Collates up to n charcters of two strings for lexical order.
24* Strings are collated on a character basis, not a byte basis.
25*
26*Entry:
27* unsigned char *s1, *s2 = strings to collate
28* size_t n = maximum number of characters to collate
29*
30*Exit:
31* Returns <0 if s1 < s2
32* Returns 0 if s1 == s2
33* Returns >0 if s1 > s2
34* Returns _NLSCMPERROR is something went wrong
35*
36*Exceptions:
37* Input parameters are validated. Refer to the validation section of the function.
38*
39*******************************************************************************/
40
41extern "C" int __cdecl _mbsncoll_l(
42 const unsigned char *s1,
43 const unsigned char *s2,
44 size_t n,
45 _locale_t plocinfo
46 )
47{
48 int ret;
49 size_t bcnt1, bcnt2;
50 _LocaleUpdate _loc_update(plocinfo);
51
52 if (n == 0)
53 return 0;
54
55 /* validation section */
56 _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR);
57 _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR);
58 _VALIDATE_RETURN(n <= INT_MAX, EINVAL, _NLSCMPERROR);
59
60 if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
61 return _strncoll_l((const char *)s1, (const char *)s2, n, plocinfo);
62
63 bcnt1 = _mbsnbcnt_l(s1, n, _loc_update.GetLocaleT());
64 bcnt2 = _mbsnbcnt_l(s2, n, _loc_update.GetLocaleT());
65
66 if ( 0 == (ret = __acrt_CompareStringA(
67 _loc_update.GetLocaleT(),
68 _loc_update.GetLocaleT()->mbcinfo->mblocalename,
69 SORT_STRINGSORT,
70 (const char *)s1,
71 (int)bcnt1,
72 (char *)s2,
73 (int)bcnt2,
74 _loc_update.GetLocaleT()->mbcinfo->mbcodepage )) )
75 {
76 errno = EINVAL;
77 return _NLSCMPERROR;
78 }
79
80 return ret - 2;
81
82}
83
84extern "C" int (__cdecl _mbsncoll)(
85 const unsigned char *s1,
86 const unsigned char *s2,
87 size_t n
88 )
89{
90 return _mbsncoll_l(s1, s2, n, nullptr);
91}