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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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|
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#include "copyright.h" |
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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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|
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#include "driver.h" |
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|
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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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|
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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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|
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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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|
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|
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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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|
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if (!isatty(fd)) |
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return(-1); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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} |
