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#ifndef lint
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static const char RCSid[] = "$Id: tty.c,v 2.3 2003/02/25 02:47:23 greg Exp $";
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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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#include "copyright.h"
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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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static dr_cominf_t ttyin;
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static dr_getchf_t;
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static void ttydone(void);
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static void newinp(void);
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extern void /* XXX declare */
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ttyset( /* 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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{
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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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static void
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ttydone(void) /* 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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static int
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getch(void) /* 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 void
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ttyin( /* read a line in raw mode */
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char *buf,
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char *prompt
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)
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{
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if (prompt != NULL)
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(*ttydev->comout)(prompt);
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editline(buf, getch, ttydev->comout);
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}
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static void
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newinp(void) /* new input */
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{
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ttydev->inpready++;
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}
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