mbsncat.cpp File Reference

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

Include dependency graph for mbsncat.cpp:

Go to the source code of this file.

Functions
unsigned char *__cdecl	_mbsncat_l (unsigned char *dst, const unsigned char *src, size_t cnt, _locale_t plocinfo)
unsigned char *__cdecl	_mbsncat (unsigned char *dst, const unsigned char *src, size_t cnt)

Function Documentation

_mbsncat()

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

Definition at line 101 of file mbsncat.cpp.

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

_mbsncat_l()

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

Definition at line 38 of file mbsncat.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 ( _ismbslead_l(start, dst, _loc_update.GetLocaleT()) )
            --dst;
 
        /* copy over the characters */
 
        while (cnt--) {
            if ( _ismbblead_l(*src, _loc_update.GetLocaleT()) ) {
                *dst++ = *src++;
                if ((*dst++ = *src++) == '\0') {
                    dst[-2] = '\0';
                    break;
                }
            }
 
            else if ((*dst++ = *src++) == '\0')
                break;
 
        }
 
        /* enter final nul, if necessary */
        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 _mbsncat().