mbsset.cpp File Reference

#include <corecrt_internal_mbstring.h>
#include <locale.h>
#include <string.h>

Include dependency graph for mbsset.cpp:

Go to the source code of this file.

Functions
unsigned char *__cdecl	_mbsset_l (unsigned char *string, unsigned int val, _locale_t plocinfo)
unsigned char *__cdecl	_mbsset (unsigned char *string, unsigned int val)

Function Documentation

_mbsset()

unsigned char *__cdecl _mbsset	(	unsigned char *	string,
		unsigned int	val
	)

Definition at line 102 of file mbsset.cpp.

{
_BEGIN_SECURE_CRT_DEPRECATION_DISABLE
    return _mbsset_l(string, val, nullptr);
_END_SECURE_CRT_DEPRECATION_DISABLE
}

_mbsset_l()

unsigned char *__cdecl _mbsset_l	(	unsigned char *	string,
		unsigned int	val,
		_locale_t	plocinfo
	)

Definition at line 40 of file mbsset.cpp.

{
        unsigned char  *start = string;
        unsigned char highval, lowval;
        _LocaleUpdate _loc_update(plocinfo);
 
        /* validation section */
        _VALIDATE_RETURN(string != nullptr, EINVAL, nullptr);
 
_BEGIN_SECURE_CRT_DEPRECATION_DISABLE
        if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
                return (unsigned char *)_strset((char *)string, val);
_END_SECURE_CRT_DEPRECATION_DISABLE
 
        highval = static_cast<unsigned char>(val >> 8);
        if (highval != 0)
        {
                /* 2-byte value */
 
                lowval = (unsigned char)(val & 0x00ff);
 
                if(lowval=='\0')
                {
                    _ASSERTE(("invalid MBCS pair passed to mbsset",0));
 
                    /* Ideally we would return nullptr here and signal an error
                       condition. But since this function has no other
                       error modes, there would be a good chance of crashing
                       the caller. So instead we fill the string with spaces
                       to ensure that no information leaks through
                       unexpectedly. Anyway, we do set errno to EINVAL.
                    */
                    errno = EINVAL;
                    lowval=highval=' ';
                }
 
                while (*string) {
 
                        *string++ = highval;
                        if (*string)
                                *string++ = lowval;
                        else
                                /* don't orphan lead byte */
                                string[-1] = ' ';
                        }
 
        }
 
        else {
                /* single byte value */
 
                while (*string)
                        *string++ = (unsigned char)val;
        }
 
        return(start);
}

Referenced by _mbsset().