GophHub - go4retro/tcpser/src/dce.h

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    1	#ifndef DCE_H
    2	#define DCE_H 1
    3	
    4	#define DCE_CL_DSR 1
    5	#define DCE_CL_DCD 2
    6	#define DCE_CL_CTS 4
    7	#define DCE_CL_DTR 8
    8	#define DCE_CL_LE 16
    9	#define DCE_CL_RI 32
   10	
   11	/* This is a cool piece of code found by Chris Osborn (fozztexx@fozztexx.com) from
   12	 * https://graphics.stanford.edu/~seander/bithacks.html#ParityWith64Bits  that
   13	 * computes even parity for any 8 bit data value
   14	 */
   15	#ifndef gen_parity
   16	#  define gen_parity(v) ((unsigned char)(((((v) * 0x0101010101010101ULL) & 0x8040201008040201ULL) % 0x1FF) & 1))
   17	#endif
   18	
   19	/* This is an impressive piece of code written by Chris Osborn (fozztexx@fozztexx.com)
   20	 * that given a value where SPACE=0,ODD=1,EVEN=2,MARK=3 parity is present in p,
   21	 * it will quickly add the correct parity to a 7 bit data value
   22	 */
   23	#ifndef apply_parity
   24	#  define apply_parity(v, p) ((unsigned char)((v & 0x7f) | (((p >> gen_parity(v & 0x7f))) & 1) << 7))
   25	#endif
   26	
   27	enum {
   28	  PARITY_SPACE_NONE = 0,
   29	  PARITY_ODD,
   30	  PARITY_EVEN,
   31	  PARITY_MARK
   32	};
   33	
   34	typedef struct dce_config {
   35	  int port_speed;
   36	  int parity;
   37	  int is_ip232;
   38	  char tty[256];
   39	  int ifd;
   40	  int ofd;
   41	  int dp[2][2];
   42	  int sSocket;
   43	  int is_connected;
   44	  int ip232_dtr;
   45	  int ip232_dcd;
   46	  int ip232_iac;
   47	  int ip232_ri;
   48	} dce_config;
   49	
   50	void dce_init_config(dce_config *cfg);
   51	int dce_connect(dce_config *cfg);
   52	int dce_set_flow_control(dce_config *cfg, int opts);
   53	int dce_set_control_lines(dce_config *cfg, int state);
   54	int dce_get_control_lines(dce_config *cfg);
   55	int dce_check_control_lines(dce_config *cfg);
   56	int dce_write(dce_config *cfg, unsigned char *data, int len);
   57	int dce_write_char_raw(dce_config *cfg, unsigned char data);
   58	int dce_read(dce_config *cfg, unsigned char *data, int len);
   59	int dce_read_char_raw(dce_config *cfg);
   60	void dce_detect_parity(dce_config *cfg, unsigned char a, unsigned char t);
   61	int dce_strip_parity(dce_config *cfg, unsigned char data);
   62	int dce_get_parity(dce_config *cfg);
   63	//int dce_check_for_break(dce_config *cfg, char ch, int chars_left);
   64	
   65	#endif
   66