ttygetc.c File Reference

#include <xinu.h>

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Functions
devcall	ttygetc (struct dentry *devptr)

Function Documentation

ttygetc()

devcall ttygetc

(

struct dentry *

devptr

)

Definition at line 9 of file ttygetc.c.

References dentry::dvminor, EOF, ttytab, TY_IBUFLEN, TY_IMCOOKED, ttycblk::tyeof, ttycblk::tyeofch, ttycblk::tyibuff, ttycblk::tyihead, ttycblk::tyimode, ttycblk::tyisem, and wait().

Referenced by ttyread().

{
    char    ch;         /* Character to return      */
    struct  ttycblk *typtr;     /* Pointer to ttytab entry  */

    typtr = &ttytab[devptr->dvminor];

    /* Wait for a character in the buffer and extract one character */

    wait(typtr->tyisem);
    ch = *typtr->tyihead++;

    /* Wrap around to beginning of buffer, if needed */

    if (typtr->tyihead >= &typtr->tyibuff[TY_IBUFLEN]) {
        typtr->tyihead = typtr->tyibuff;
    }

    /* In cooked mode, check for the EOF character */

    if ( (typtr->tyimode == TY_IMCOOKED) && (typtr->tyeof) &&
         (ch == typtr->tyeofch) ) {
        return (devcall)EOF;
    }

    return (devcall)ch;
}

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