tty.h

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/* tty.h */

#define TY_OBMINSP  20      /* Min space in buffer before   */
                    /*   processes awakened to write*/
#define TY_EBUFLEN  20      /* Size of echo queue       */

/* Size constants */

#ifndef Ntty
#define Ntty        1       /* Number of serial tty lines   */
#endif
#ifndef TY_IBUFLEN
#define TY_IBUFLEN  128     /* Num. chars in input queue    */
#endif
#ifndef TY_OBUFLEN
#define TY_OBUFLEN  64      /* Num. chars in output queue   */
#endif

/* Mode constants for input and output modes */

#define TY_IMRAW    'R'     /* Raw input mode => no edits   */
#define TY_IMCOOKED 'C'     /* Cooked mode => line editing  */
#define TY_IMCBREAK 'K'     /* Honor echo, etc, no line edit*/
#define TY_OMRAW    'R'     /* Raw output mode => no edits  */

struct  ttycblk {           /* Tty line control block   */
    char    *tyihead;       /* Next input char to read  */
    char    *tyitail;       /* Next slot for arriving char  */
    char    tyibuff[TY_IBUFLEN];    /* Input buffer (holds one line)*/
    sid32   tyisem;         /* Input semaphore      */
    char    *tyohead;       /* Next output char to xmit */
    char    *tyotail;       /* Next slot for outgoing char  */
    char    tyobuff[TY_OBUFLEN];    /* Output buffer        */
    sid32   tyosem;         /* Output semaphore     */
    char    *tyehead;       /* Next echo char to xmit   */
    char    *tyetail;       /* Next slot to deposit echo ch */
    char    tyebuff[TY_EBUFLEN];    /* Echo buffer          */
    char    tyimode;        /* Input mode raw/cbreak/cooked */
    bool8   tyiecho;        /* Is input echoed?     */
    bool8   tyieback;       /* Do erasing backspace on echo?*/
    bool8   tyevis;         /* Echo control chars as ^X ?   */
    bool8   tyecrlf;        /* Echo CR-LF for newline?  */
    bool8   tyicrlf;        /* Map '\r' to '\n' on input?   */
    bool8   tyierase;       /* Honor erase character?   */
    char    tyierasec;      /* Primary erase character  */
    char    tyierasec2;     /* Alternate erase character    */
    bool8   tyeof;          /* Honor EOF character?     */
    char    tyeofch;        /* EOF character (usually ^D)   */
    bool8   tyikill;        /* Honor line kill character?   */
    char    tyikillc;       /* Line kill character      */
    int32   tyicursor;      /* Current cursor position  */
    bool8   tyoflow;        /* Honor ostop/ostart?      */
    bool8   tyoheld;        /* Output currently being held? */
    char    tyostop;        /* Character that stops output  */
    char    tyostart;       /* Character that starts output */
    bool8   tyocrlf;        /* Output CR/LF for LF ?    */
    char    tyifullc;       /* Char to send when input full */
};
extern  struct  ttycblk ttytab[];

/* Characters with meaning to the tty driver */

#define TY_BACKSP   '\b'        /* Backspace character      */
#define TY_BACKSP2  '\177'      /* Alternate backspace char.    */
#define TY_BELL     '\07'       /* Character for audible beep   */
#define TY_EOFCH    '\04'       /* Control-D is EOF on input    */
#define TY_BLANK    ' '     /* Blank            */
#define TY_NEWLINE  '\n'        /* Newline == line feed     */
#define TY_RETURN   '\r'        /* Carriage return character    */
#define TY_STOPCH   '\023'      /* Control-S stops output   */
#define TY_STRTCH   '\021'      /* Control-Q restarts output    */
#define TY_KILLCH   '\025'      /* Control-U is line kill   */
#define TY_UPARROW  '^'     /* Used for control chars (^X)  */
#define TY_FULLCH   TY_BELL     /* Char to echo when buffer full*/

/* Tty control function codes */

#define TC_NEXTC    3       /* Look ahead 1 character   */
#define TC_MODER    4       /* Set input mode to raw    */
#define TC_MODEC    5       /* Set input mode to cooked */
#define TC_MODEK    6       /* Set input mode to cbreak */
#define TC_ICHARS   8       /* Return number of input chars */
#define TC_ECHO     9       /* Turn on echo         */
#define TC_NOECHO   10      /* Turn off echo        */