mbsstr.cpp File Reference

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

Include dependency graph for mbsstr.cpp:

Go to the source code of this file.

Functions
_CONST_RETURN unsigned char *__cdecl	_mbsstr_l (const unsigned char *str1, const unsigned char *str2, _locale_t plocinfo)
_CONST_RETURN unsigned char *__cdecl	_mbsstr (const unsigned char *str1, const unsigned char *str2)

Function Documentation

_mbsstr()

_CONST_RETURN unsigned char *__cdecl _mbsstr	(	const unsigned char *	str1,
		const unsigned char *	str2
	)

Definition at line 95 of file mbsstr.cpp.

{
    return _mbsstr_l(str1, str2, nullptr);
}

_mbsstr_l()

_CONST_RETURN unsigned char *__cdecl _mbsstr_l	(	const unsigned char *	str1,
		const unsigned char *	str2,
		_locale_t	plocinfo
	)

Definition at line 39 of file mbsstr.cpp.

{
        unsigned char *cp, *s1, *s2, *endp;
        _LocaleUpdate _loc_update(plocinfo);
 
        if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
            return (unsigned char *)strstr((const char *)str1, (const char *)str2);
 
        /* validation section */
        _VALIDATE_RETURN(str2 != nullptr, EINVAL, 0);
        if ( *str2 == '\0')
            return (unsigned char *)str1;
        _VALIDATE_RETURN(str1 != nullptr, EINVAL, 0);
 
        cp = (unsigned char *) str1;
        endp = (unsigned char *) (str1 + (strlen((const char *)str1) - strlen((const char *)str2)));
 
        while (*cp && (cp <= endp))
        {
            s1 = cp;
            s2 = (unsigned char *) str2;
 
            /*
             * MBCS: ok to ++ since doing equality comparison.
             * [This depends on MBCS strings being "legal".]
             */
            while ( *s1 && *s2 && (*s1 == *s2) )
                s1++, s2++;
 
            if (!(*s2))
                return(cp);     /* success! */
 
            /*
             * bump pointer to next char
             */
            if ( _ismbblead_l(*(cp++), _loc_update.GetLocaleT()) )
            {
                /*  don't move forward if we have leadbyte, EOS
                    means dud string was passed in.
                    Don't assert - too low level
                */
                if(*cp!='\0')
                {
                    cp++;
                }
            }
        }
 
        return(nullptr);
 
}

Referenced by _mbsstr().