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Reactos
1/***
2*strncoll.c - Collate locale strings
3*
4* Copyright (c) Microsoft Corporation. All rights reserved.
5*
6*Purpose:
7* Compare two strings using the locale LC_COLLATE information.
8* Compares at most n characters of two strings.
9*
10*******************************************************************************/
11#include <corecrt_internal.h>
12#include <ctype.h>
13#include <locale.h>
14#include <string.h>
15
16/***
17*int _strncoll() - Collate locale strings
18*
19*Purpose:
20* Compare two strings using the locale LC_COLLATE information.
21* Compares at most n characters of two strings.
22*
23*Entry:
24* const char *s1 = pointer to the first string
25* const char *s2 = pointer to the second string
26* size_t count - maximum number of characters to compare
27*
28*Exit:
29* Less than 0 = first string less than second string
30* 0 = strings are equal
31* Greater than 0 = first string greater than second string
32* Returns _NLSCMPERROR is something went wrong
33*
34*Exceptions:
35* Input parameters are validated. Refer to the validation section of the function.
36*
37*******************************************************************************/
38extern "C" int __cdecl _strncoll_l (
39 const char *_string1,
40 const char *_string2,
41 size_t count,
42 _locale_t plocinfo
43 )
44{
45 int ret;
46
47 if ( !count )
48 return 0;
49
50 /* validation section */
51 _VALIDATE_RETURN(_string1 != nullptr, EINVAL, _NLSCMPERROR);
52 _VALIDATE_RETURN(_string2 != nullptr, EINVAL, _NLSCMPERROR);
53 _VALIDATE_RETURN(count <= INT_MAX, EINVAL, _NLSCMPERROR);
54
55 _LocaleUpdate _loc_update(plocinfo);
56
57 if ( _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE] == nullptr )
58 {
59 return strncmp(_string1, _string2, count);
60 }
61
62 if ( 0 == (ret = __acrt_CompareStringA(
63 _loc_update.GetLocaleT(),
64 _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE],
65 SORT_STRINGSORT,
66 _string1,
67 (int)count,
68 _string2,
69 (int)count,
70 _loc_update.GetLocaleT()->locinfo->lc_collate_cp)) )
71 {
72 errno = EINVAL;
73 return _NLSCMPERROR;
74 }
75
76 return (ret - 2);
77}
78
79extern "C" int __cdecl _strncoll (
80 const char *_string1,
81 const char *_string2,
82 size_t count
83 )
84{
85 if (!__acrt_locale_changed())
86 {
87 /* validation section */
88 _VALIDATE_RETURN(_string1 != nullptr, EINVAL, _NLSCMPERROR);
89 _VALIDATE_RETURN(_string2 != nullptr, EINVAL, _NLSCMPERROR);
90 _VALIDATE_RETURN(count <= INT_MAX, EINVAL, _NLSCMPERROR);
91
92 return strncmp(_string1, _string2, count);
93 }
94 else
95 {
96 return _strncoll_l(_string1, _string2, count, nullptr);
97 }
98}