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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136/****wcsxfrm.c - Transform a wide-character string using locale information** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Transform a wide-character string using the locale information as set by* LC_COLLATE.********************************************************************************/#include <corecrt_internal.h>#include <ctype.h>#include <locale.h>#include <string.h>
/****size_t wcsxfrm() - Transform a string using locale information**Purpose:* Transform the wide string pointed to by _string2 and place the* resulting wide string into the array pointed to by _string1.* No more than _count wide characters are placed into the* resulting string (including the null).** The transformation is such that if wcscmp() is applied to* the two transformed strings, the return value is equal to* the result of wcscoll() applied to the two original strings.* Thus, the conversion must take the locale LC_COLLATE info* into account.** In the C locale, wcsxfrm() simply resolves to wcsncpy()/wcslen().**Entry:* wchar_t *_string1 = result string* const wchar_t *_string2 = source string* size_t _count = max wide chars to move** [If _count is 0, _string1 is permitted to be nullptr.]**Exit:* Length of the transformed string (not including the terminating* null). If the value returned is >= _count, the contents of the* _string1 array are indeterminate.**Exceptions:* Non-standard: if OM/API error, return INT_MAX.* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" size_t __cdecl _wcsxfrm_l ( wchar_t *_string1, const wchar_t *_string2, size_t _count, _locale_t plocinfo ){ int size = INT_MAX;
/* validation section */ _VALIDATE_RETURN(_count <= INT_MAX, EINVAL, INT_MAX); _VALIDATE_RETURN(_string1 != nullptr || _count == 0, EINVAL, INT_MAX); _VALIDATE_RETURN(_string2 != nullptr, EINVAL, INT_MAX);
_LocaleUpdate _loc_update(plocinfo);
if ( _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE] == nullptr ) {_BEGIN_SECURE_CRT_DEPRECATION_DISABLE wcsncpy(_string1, _string2, _count);_END_SECURE_CRT_DEPRECATION_DISABLE return wcslen(_string2); }
if ( 0 == (size = __acrt_LCMapStringW( _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE], LCMAP_SORTKEY, _string2, -1, nullptr, 0 )) ) { errno = EILSEQ; size = INT_MAX; } else { if ( size <= (int)_count) { if ( 0 == (size = __acrt_LCMapStringW( _loc_update.GetLocaleT()->locinfo->locale_name[LC_COLLATE], LCMAP_SORTKEY, _string2, -1, (wchar_t *)_string1, (int)_count )) ) { errno = EILSEQ; size = INT_MAX; /* default error */ } else { // Note that the size that LCMapStringW returns for // LCMAP_SORTKEY is number of bytes needed. That's why it // is safe to convert the buffer to wide char from end. _count = size--; for (;_count-- > 0;) {#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]' _string1[_count] = (wchar_t)((unsigned char *)_string1)[_count]; } } } else { if (_string1 != nullptr && _count > 0) { *_string1 = '\0'; errno = ERANGE; } size--; } }
return (size_t)size;}
extern "C" size_t __cdecl wcsxfrm ( wchar_t *_string1, const wchar_t *_string2, size_t _count ){
return _wcsxfrm_l(_string1, _string2, _count, nullptr);}