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1/***
2*wcsicmp.cpp - contains case-insensitive wide string comp routine _wcsicmp
3*
4* Copyright (c) Microsoft Corporation. All rights reserved.
5*
6*Purpose:
7* contains _wcsicmp()
8*
9*******************************************************************************/
10#include <corecrt_internal.h>
11#include <ctype.h>
12#include <locale.h>
13#include <string.h>
14
15#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018 Prefast can't see that we are checking for terminal nul.
16
17/***
18*int _wcsicmp(lhs, rhs) - compare wide-character strings, ignore case
19*
20*Purpose:
21* _wcsicmp performs a case-insensitive wchar_t string comparision.
22* _wcsicmp is independent of locale.
23*
24*Entry:
25* wchar_t *lhs, *rhs - strings to compare
26*
27*Return:
28* Returns <0 if lhs < rhs
29* Returns 0 if lhs = rhs
30* Returns >0 if lhs > rhs
31* Returns _NLSCMPERROR if something went wrong
32* This range of return values may differ from other *cmp/*coll functions.
33*
34*Exceptions:
35* Input parameters are validated. Refer to the validation section of the function.
36*
37*******************************************************************************/
38
39extern "C" int __cdecl _wcsicmp_l (
40 wchar_t const * const lhs,
41 wchar_t const * const rhs,
42 _locale_t const plocinfo
43 )
44{
45 /* validation section */
46 _VALIDATE_RETURN(lhs != nullptr, EINVAL, _NLSCMPERROR);
47 _VALIDATE_RETURN(rhs != nullptr, EINVAL, _NLSCMPERROR);
48
49 _LocaleUpdate _loc_update(plocinfo);
50
51 // This check is still worth doing for wide but not narrow because
52 // we need to consult the UTF-16 ctype map for towlower operations.
53 if (_loc_update.GetLocaleT()->locinfo->locale_name[LC_CTYPE] == nullptr)
54 {
55 return __ascii_wcsicmp(lhs, rhs);
56 }
57
58 unsigned short const * lhs_ptr = reinterpret_cast<unsigned short const *>(lhs);
59 unsigned short const * rhs_ptr = reinterpret_cast<unsigned short const *>(rhs);
60
61 int result;
62 int lhs_value;
63 int rhs_value;
64 do
65 {
66 lhs_value = _towlower_internal(*lhs_ptr++, _loc_update.GetLocaleT());
67 rhs_value = _towlower_internal(*rhs_ptr++, _loc_update.GetLocaleT());
68 result = lhs_value - rhs_value;
69 }
70 while (result == 0 && lhs_value != 0);
71
72 return result;
73}
74
75extern "C" int __cdecl __ascii_wcsicmp(
76 wchar_t const * const lhs,
77 wchar_t const * const rhs
78 )
79{
80 unsigned short const * lhs_ptr = reinterpret_cast<unsigned short const *>(lhs);
81 unsigned short const * rhs_ptr = reinterpret_cast<unsigned short const *>(rhs);
82
83 int result;
84 int lhs_value;
85 int rhs_value;
86 do
87 {
88 lhs_value = __ascii_towlower(*lhs_ptr++);
89 rhs_value = __ascii_towlower(*rhs_ptr++);
90 result = lhs_value - rhs_value;
91 }
92 while (result == 0 && lhs_value != 0);
93
94 return result;
95}
96
97extern "C" int __cdecl _wcsicmp(
98 wchar_t const * const lhs,
99 wchar_t const * const rhs
100 )
101{
102 if (!__acrt_locale_changed())
103 {
104 /* validation section */
105 _VALIDATE_RETURN(lhs != nullptr, EINVAL, _NLSCMPERROR);
106 _VALIDATE_RETURN(rhs != nullptr, EINVAL, _NLSCMPERROR);
107
108 return __ascii_wcsicmp(lhs, rhs);
109 }
110
111 return _wcsicmp_l(lhs, rhs, nullptr);
112}