GetPassword

/*
*    定义函数 char * GetPassword(char* _pPassword, int _nLen, char _chShow);
*    表头文件 #include
*    函数描述    密码读取函数，从终端度取密码。
*                        _pPassword 要有足够的空间来容纳读取的密码。
*                        _nLen 限制密码的最大长度
*                        _chShow 为输入密码后回显的字符。值为 0 时不回显。
*     返回值     返回 _pPassword 的字符串起始地址。     
*        作 者 武立强
*        时    间    2009-02-08
*        注    意    \b Backspace \n Newline \r Carriage return
*                        getch() 读取一个字符,不回显.
*/
char * GetPassword(char* _pPassword, int _nLen, char _chShow)
{
    assert( NULL != _pPassword );

    int nCourrent = 0;
    char * pFirst = _pPassword;

    while(1)
    {
        *_pPassword = getch();
        
        if( '\n' == *_pPassword || '\r' == *_pPassword )
        {    
            *_pPassword = '\0';
            break;
        }
        else if( '\b' == *_pPassword && 0 == nCourrent )
        {
            continue;        
        }
        else if( '\b' == *_pPassword && 0 == _chShow )
        {
            _pPassword--;
            nCourrent--;
            continue;
        }
        else if( '\b' == *_pPassword )
        {
            _pPassword--;
            nCourrent--;
            printf("\b \b"); // 注意细节,中间有个空格

            continue;
        }
        else if( nCourrent >= _nLen )
        {
            continue;    
        }
    
        // 是否回显

        if( 0 != _chShow )
        {
            printf("%c", _chShow);
        }    
        _pPassword++;
        nCourrent++;
    }
    _pPassword = NULL;

    return pFirst;
}

 

自己写的函数,欢迎多提意见.