mbsnbset.cpp File Reference

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

Include dependency graph for mbsnbset.cpp:

Go to the source code of this file.

Functions
unsigned char *__cdecl	_mbsnbset_l (unsigned char *string, unsigned int val, size_t count, _locale_t plocinfo)
unsigned char *__cdecl	_mbsnbset (unsigned char *string, unsigned int val, size_t count)

Function Documentation

_mbsnbset()

unsigned char *__cdecl _mbsnbset	(	unsigned char *	string,
		unsigned int	val,
		size_t	count
	)

Definition at line 127 of file mbsnbset.cpp.

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

_mbsnbset_l()

unsigned char *__cdecl _mbsnbset_l	(	unsigned char *	string,
		unsigned int	val,
		size_t	count,
		_locale_t	plocinfo
	)

Definition at line 56 of file mbsnbset.cpp.

{
        unsigned char *start = string;
        unsigned char highval, lowval;
        _LocaleUpdate _loc_update(plocinfo);
 
_BEGIN_SECURE_CRT_DEPRECATION_DISABLE
        if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
            return (unsigned char *)_strnset((char *)string, val, count);
_END_SECURE_CRT_DEPRECATION_DISABLE
 
        /* validation section */
        _VALIDATE_RETURN(string != nullptr || count == 0, EINVAL, nullptr);
 
        /*
         * leadbyte flag indicates if the last byte we overwrote was
         * a lead byte or not.
         */
 
        highval = static_cast<unsigned char>(val >> 8);
        if (highval)
        {
                /* double byte value */
 
                lowval = (unsigned char)(val & 0x00ff);
 
                if(lowval=='\0')
                {
                    _ASSERTE(("invalid MBCS pair passed to mbsnbset",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 ((count--) && *string) {
 
                        /* pad with ' ' if no room for both bytes -- odd len */
                        if ((!count--) || (!*(string+1))) {
                                *string = ' ';
                                break;
                        }
 
                        *string++ = highval;
                        *string++ = lowval;
                }
        }
 
        else {
                /* single byte value */
 
                while (count-- && *string) {
                        *string++ = (unsigned char)val;
                }
 
        }
 
        return( start );
}

Referenced by _mbsnbset().