mbstok_s.cpp File Reference

#include <corecrt_internal_mbstring.h>
#include <corecrt_internal_securecrt.h>

Include dependency graph for mbstok_s.cpp:

Go to the source code of this file.

Functions
unsigned char *__cdecl	_mbstok_s_l (unsigned char *_String, const unsigned char *_Control, unsigned char **_Context, _LOCALE_ARG_DECL)

Function Documentation

_mbstok_s_l()

unsigned char *__cdecl _mbstok_s_l	(	unsigned char *	_String,
		const unsigned char *	_Control,
		unsigned char **	_Context,
		_LOCALE_ARG_DECL
	)

Definition at line 17 of file mbstok_s.cpp.

{
    unsigned char *token;
    const unsigned char *ctl;
    int dbc;
 
    /* validation section */
    _VALIDATE_POINTER_ERROR_RETURN(_Context, EINVAL, nullptr);
    _VALIDATE_POINTER_ERROR_RETURN(_Control, EINVAL, nullptr);
    _VALIDATE_CONDITION_ERROR_RETURN(_String != nullptr || *_Context != nullptr, EINVAL, nullptr);
 
    _LOCALE_UPDATE;
    if (_LOCALE_SHORTCUT_TEST)
    {
        return (unsigned char*)strtok_s((char *)_String, (const char *)_Control, (char **)_Context);
    }
 
    /* If string==nullptr, continue with previous string */
    if (!_String)
    {
        _String = *_Context;
    }
 
    /* Find beginning of token (skip over leading delimiters). Note that
    * there is no token iff this loop sets string to point to the terminal null. */
    for ( ; *_String != 0; _String++)
    {
        for (ctl = _Control; *ctl != 0; ctl++)
        {
            if (_ISMBBLEAD(*ctl))
            {
                if (ctl[1] == 0)
                {
                    ctl++;
                    _SET_MBCS_ERROR;
                    break;
                }
                if (*ctl == *_String && ctl[1] == _String[1])
                {
                    break;
                }
                ctl++;
            }
            else
            {
                if (*ctl == *_String)
                {
                    break;
                }
            }
        }
        if (*ctl == 0)
        {
            break;
        }
        if (_ISMBBLEAD(*_String))
        {
            _String++;
            if (*_String == 0)
            {
                _SET_MBCS_ERROR;
                break;
            }
        }
    }
 
    token = _String;
 
    /* Find the end of the token. If it is not the end of the string,
    * put a null there. */
    for ( ; *_String != 0; _String++)
    {
        for (ctl = _Control, dbc = 0; *ctl != 0; ctl++)
        {
            if (_ISMBBLEAD(*ctl))
            {
                if (ctl[1] == 0)
                {
                    ctl++;
                    break;
                }
                if (ctl[0] == _String[0] && ctl[1] == _String[1])
                {
                    dbc = 1;
                    break;
                }
                ctl++;
            }
            else
            {
                if (*ctl == *_String)
                {
                    break;
                }
            }
        }
        if (*ctl != 0)
        {
            *_String++ = 0;
            if (dbc)
            {
                *_String++ = 0;
            }
            break;
        }
        if (_ISMBBLEAD(_String[0]))
        {
            if (_String[1] == 0)
            {
                *_String = 0;
                break;
            }
            _String++;
        }
    }
 
    /* Update the context */
    *_Context = _String;
 
    /* Determine if a token has been found. */
    if (token == _String)
    {
        return nullptr;
    }
    else
    {
        return token;
    }
}

Referenced by _mbstok_l().