mbsnbcat.cpp File Reference

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

Include dependency graph for mbsnbcat.cpp:

Go to the source code of this file.

Functions
unsigned char *__cdecl	_mbsnbcat_l (unsigned char *dst, const unsigned char *src, size_t cnt, _locale_t plocinfo)
unsigned char *__cdecl	_mbsnbcat (unsigned char *dst, const unsigned char *src, size_t cnt)

Function Documentation

_mbsnbcat()

unsigned char *__cdecl _mbsnbcat	(	unsigned char *	dst,
		const unsigned char *	src,
		size_t	cnt
	)

Definition at line 107 of file mbsnbcat.cpp.

{
    _BEGIN_SECURE_CRT_DEPRECATION_DISABLE
    return _mbsnbcat_l(dst, src, cnt, nullptr);
    _END_SECURE_CRT_DEPRECATION_DISABLE
}

_mbsnbcat_l()

unsigned char *__cdecl _mbsnbcat_l	(	unsigned char *	dst,
		const unsigned char *	src,
		size_t	cnt,
		_locale_t	plocinfo
	)

Definition at line 40 of file mbsnbcat.cpp.

{
        unsigned char *start;
 
        if (!cnt)
                return(dst);
 
        /* validation section */
        _VALIDATE_RETURN(dst != nullptr, EINVAL, nullptr);
        _VALIDATE_RETURN(src != nullptr, EINVAL, nullptr);
 
        _LocaleUpdate _loc_update(plocinfo);
 
        _BEGIN_SECURE_CRT_DEPRECATION_DISABLE
        if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
            return (unsigned char *)strncat((char *)dst, (const char *)src, cnt);
        _END_SECURE_CRT_DEPRECATION_DISABLE
 
        start = dst;
        while (*dst++)
                ;
        --dst;          // dst now points to end of dst string
 
        /* if last char in string is a lead byte, back up pointer */
        if ( dst!=start && _mbsbtype_l(start, (int) ((dst - start) - 1), _loc_update.GetLocaleT()) == _MBC_LEAD )
        {
            --dst;
        }
 
        /* copy over the characters */
 
        while (cnt--) {
 
            if ( _ismbblead_l(*src, _loc_update.GetLocaleT()) ) {
                *dst++ = *src++;
                if (cnt == 0) {   /* write null if cnt exhausted */
                    dst[-1] = '\0';
                    break;
                }
                cnt--;
                if ((*dst++ = *src++)=='\0') { /* or if no trail byte */
                    dst[-2] = '\0';
                    break;
                }
            }
            else if ((*dst++ = *src++) == '\0')
                break;
 
        }
 
        if ( dst!=start && _mbsbtype_l(start, (int) ((dst - start) - 1), _loc_update.GetLocaleT()) == _MBC_LEAD )
        {
            dst[-1] = '\0';
        }
        else
        {
            *dst = '\0';
        }
 
        return(start);
}

Referenced by _mbsnbcat().