C语言里如何定义任意bit长度的类型来着

C语言里如何定义任意bit长度的类型来着

下面就是一个例子，定义了一个结构体变量ch，包含多个位域。
struct{
unsigned con: 8;
unsigned forecolor: 4;
unsigned bgcolor: 3;
unsigned blink: 1;
}ch;

c语言中bit类型是“位”数据类型，一般在嵌入式软件中应用较多，用于io口的控制，可以是单独申明位变量，也可以申请位结构数据类型，比如： struct st_flash {                                                            union {                                                              unsigned char byte;                                   struct {                                                                unsigned char fwe :1;                                    unsigned char swe1:1;                                    unsigned char esu1:1;                                    unsigned char psu1:1;                                    unsigned char ev1 :1;                                    unsigned char pv1 :1;                                    unsigned char e1  :1;                                     unsigned char p1  :1;                                     }      bit;                         }         flmcr1;                   union {                                                        unsigned char byte;                                      struct {                                                                   unsigned char fler:1;                                    unsigned char swe2:1;                                    unsigned char esu2:1;                                    unsigned char psu2:1;                                    unsigned char ev2 :1;                                    unsigned char pv2 :1;                                    unsigned char e2  :1;                                    unsigned char p2  :1;                                    }      bit;                        }         flmcr2;                   union {                                                        unsigned char byte;                                      struct {                                                        unsigned char eb7:1;                                     unsigned char eb6:1;                                     unsigned char eb5:1;                                     unsigned char eb4:1;                                     unsigned char eb3:1;                                     unsigned char eb2:1;                                     unsigned char eb1:1;                                     unsigned char eb0:1;                                     }      bit;                        }         ebr1;                 union {                                                        unsigned char byte;                                      struct {                                                        unsigned char eb15:1;                                    unsigned char eb14:1;                                    unsigned char eb13:1;                                    unsigned char eb12:1;                                    unsigned char eb11:1;                                    unsigned char eb10:1;                                    unsigned char eb9 :1;                                    unsigned char eb8 :1;                                    }      bit;                          }         ebr2;  };