wcsxfrm.cpp File Reference

#include <corecrt_internal.h>
#include <ctype.h>
#include <locale.h>
#include <string.h>

Include dependency graph for wcsxfrm.cpp:

Go to the source code of this file.

Functions
size_t __cdecl	_wcsxfrm_l (wchar_t *_string1, const wchar_t *_string2, size_t _count, _locale_t plocinfo)
size_t __cdecl	wcsxfrm (wchar_t *_string1, const wchar_t *_string2, size_t _count)

Function Documentation

_wcsxfrm_l()

size_t __cdecl _wcsxfrm_l	(	wchar_t *	_string1,
		const wchar_t *	_string2,
		size_t	_count,
		_locale_t	plocinfo
	)

Definition at line 51 of file wcsxfrm.cpp.

{
    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;
}

Referenced by wcsxfrm().

wcsxfrm()

size_t __cdecl wcsxfrm	(	wchar_t *	_string1,
		const wchar_t *	_string2,
		size_t	_count
	)

Definition at line 126 of file wcsxfrm.cpp.

{
 
    return _wcsxfrm_l(_string1, _string2, _count, nullptr);
}