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greg |
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/* Copyright (c) 1987 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* tty.c - i/o for terminal drivers.
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*
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* 4/24/87
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include "driver.h"
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/*
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* Drivers using these routines must call getch()
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* for input from stdin.
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*/
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struct sgttyb ttymode; /* original tty modes */
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int ttyfd; /* tty file descriptor */
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struct driver *ttydev; /* tty device */
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ttyset(dev, fd) /* set up raw tty device */
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struct driver *dev;
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int fd;
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{
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int ttyin(), newinp();
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struct sgttyb flags;
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if (!isatty(fd))
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return(-1);
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ttyfd = fd;
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ioctl(ttyfd, TIOCGETP, &ttymode);
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ioctl(ttyfd, TIOCGETP, &flags);
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flags.sg_flags |= RAW; /* also turns output */
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flags.sg_flags &= ~ECHO; /* processing off */
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ioctl(ttyfd, TIOCSETP, &flags);
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/* install input handler */
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ttydev = dev;
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ttydev->comin = ttyin;
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ttydev->inpready = 0;
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signal(SIGIO, newinp);
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fcntl(ttyfd, F_SETFL, FASYNC);
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return(0);
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}
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ttydone() /* restore tty modes */
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{
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fcntl(ttyfd, F_SETFL, 0);
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signal(SIGIO, SIG_DFL);
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ioctl(ttyfd, TIOCSETP, &ttymode);
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ttydev->comin = NULL;
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ttydev->inpready = 0;
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ttydev = NULL;
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}
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int
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getch() /* get a character in raw mode */
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{
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register int c;
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fcntl(ttyfd, F_SETFL, 0); /* allow read to block */
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if (ttydev->inpready > 0)
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ttydev->inpready--;
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c = getchar();
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fcntl(ttyfd, F_SETFL, FASYNC);
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return(c);
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}
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static
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ttyin(buf) /* read a line in raw mode */
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char *buf;
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{
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int getch();
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editline(buf, getch, ttydev->comout, ttymode.sg_erase, ttymode.sg_kill);
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}
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static
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newinp() /* new input */
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{
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ttydev->inpready++;
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}
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