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1/***
2*wcsxfrm.c - Transform a wide-character string using locale information
3*
4* Copyright (c) Microsoft Corporation. All rights reserved.
5*
6*Purpose:
7* Transform a wide-character string using the locale information as set by
8* LC_COLLATE.
9*
10*******************************************************************************/
11#include <corecrt_internal.h>
12#include <ctype.h>
13#include <locale.h>
14#include <string.h>
15
16/***
17*size_t wcsxfrm() - Transform a string using locale information
18*
19*Purpose:
20* Transform the wide string pointed to by _string2 and place the
21* resulting wide string into the array pointed to by _string1.
22* No more than _count wide characters are placed into the
23* resulting string (including the null).
24*
25* The transformation is such that if wcscmp() is applied to
26* the two transformed strings, the return value is equal to
27* the result of wcscoll() applied to the two original strings.
28* Thus, the conversion must take the locale LC_COLLATE info
29* into account.
30*
31* In the C locale, wcsxfrm() simply resolves to wcsncpy()/wcslen().
32*
33*Entry:
34* wchar_t *_string1 = result string
35* const wchar_t *_string2 = source string
36* size_t _count = max wide chars to move
37*
38* [If _count is 0, _string1 is permitted to be nullptr.]
39*
40*Exit:
41* Length of the transformed string (not including the terminating
42* null). If the value returned is >= _count, the contents of the
43* _string1 array are indeterminate.
44*
45*Exceptions:
46* Non-standard: if OM/API error, return INT_MAX.
47* Input parameters are validated. Refer to the validation section of the function.
48*
49*******************************************************************************/
50
51extern "C" size_t __cdecl _wcsxfrm_l (
52 wchar_t *_string1,
53 const wchar_t *_string2,
54 size_t _count,
55 _locale_t plocinfo
56 )
57{
58 int size = INT_MAX;
59
60 /* validation section */
61 _VALIDATE_RETURN(_count <= INT_MAX, EINVAL, INT_MAX);
62 _VALIDATE_RETURN(_string1 != nullptr || _count == 0, EINVAL, INT_MAX);
63 _VALIDATE_RETURN(_string2 != nullptr, EINVAL, INT_MAX);
64
65 _LocaleUpdate _loc_update(plocinfo);
66
67 if ( _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE] == nullptr )
68 {
69_BEGIN_SECURE_CRT_DEPRECATION_DISABLE
70 wcsncpy(_string1, _string2, _count);
71_END_SECURE_CRT_DEPRECATION_DISABLE
72 return wcslen(_string2);
73 }
74
75 if ( 0 == (size = __acrt_LCMapStringW(
76 _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE],
77 LCMAP_SORTKEY,
78 _string2,
79 -1,
80 nullptr,
81 0 )) )
82 {
83 errno = EILSEQ;
84 size = INT_MAX;
85 } else
86 {
87 if ( size <= (int)_count)
88 {
89 if ( 0 == (size = __acrt_LCMapStringW(
90 _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE],
91 LCMAP_SORTKEY,
92 _string2,
93 -1,
94 (wchar_t *)_string1,
95 (int)_count )) )
96 {
97 errno = EILSEQ;
98 size = INT_MAX; /* default error */
99 } else
100 {
101 // Note that the size that LCMapStringW returns for
102 // LCMAP_SORTKEY is number of bytes needed. That's why it
103 // is safe to convert the buffer to wide char from end.
104 _count = size--;
105 for (;_count-- > 0;)
106 {
107#pragma warning(suppress:__WARNING_DEREF_NULL_PTR __WARNING_POTENTIAL_BUFFER_OVERFLOW_HIGH_PRIORITY) // 6011 Dereferencing NULL pointer '_string1' 26015 Potential overflow using expression '_string1[_count]'
108 _string1[_count] = (wchar_t)((unsigned char *)_string1)[_count];
109 }
110 }
111 }
112 else
113 {
114 if (_string1 != nullptr && _count > 0)
115 {
116 *_string1 = '\0';
117 errno = ERANGE;
118 }
119 size--;
120 }
121 }
122
123 return (size_t)size;
124}
125
126extern "C" size_t __cdecl wcsxfrm (
127 wchar_t *_string1,
128 const wchar_t *_string2,
129 size_t _count
130 )
131{
132
133 return _wcsxfrm_l(_string1, _string2, _count, nullptr);
134}
135