#include <termios.h>
#include <term.h>
-#define NOBUF 512 /* Output buffer size. */
+#define NOBUF 512 /* Output buffer size. */
#ifndef TCSASOFT
#define TCSASOFT 0
#endif
char obuf[NOBUF]; /* Output buffer. */
-int nobuf; /* buffer count */
-
-static struct termios ot; /* entry state of the terminal */
-static struct termios nt; /* editor's terminal state */
-
-static int ttyactivep = FALSE; /* terminal in editor mode? */
-static int ttysavedp = FALSE; /* terminal state saved? */
-
+int nobuf; /* Buffer count. */
+struct termios oldtty; /* POSIX tty settings. */
+struct termios newtty;
int nrow; /* Terminal size, rows. */
int ncol; /* Terminal size, columns. */
+/* XXX - move most of these to def.h? */
+void ttopen __P((void));
+int ttraw __P((void));
+void ttclose __P((void));
+int ttcooked __P((void));
+void ttputc __P((int));
+void ttflush __P((void));
+int ttgetc __P((void));
+void setttysize __P((void));
+int typeahead __P((void));
+void panic __P((char *));
+int ttwait __P((void));
+
/*
- * This function gets called once, to set up
- * the terminal channel. This version turns off flow
- * control. This may be wrong for your system, but no
- * good solution has really been found (daveb).
+ * This function gets called once, to set up the terminal
+ * On systems w/o TCSASOFT we turn off off flow control,
+ * which isn't really the right thing to do.
*/
+void
ttopen()
{
- register char *cp;
-
- if (ttyactivep)
- return;
-
- if( !ttysavedp )
- {
- if (tcgetattr(0, &ot) < 0)
- abort();
- nt = ot; /* save entry state */
- /* Set terminal to 'raw' mode and ignore a 'break' */
- nt.c_cc[VMIN] = 1;
- nt.c_cc[VTIME] = 0;
- nt.c_iflag |= IGNBRK;
- nt.c_iflag &= ~(BRKINT|PARMRK|INLCR|IGNCR|ICRNL|IXON);
- nt.c_oflag &= ~OPOST;
- nt.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
-#if !TCSASOFT
- /*
- * If we don't have TCSASOFT, force terminal to
- * 8 bits, no parity.
- */
- nt.c_iflag &= ~ISTRIP;
- nt.c_cflag &= ~(CSIZE|PARENB);
- nt.c_cflag |= CS8;
-#endif
+ if (ttraw() == FALSE)
+ panic("aborting due to terminal initialize failure");
+}
+
+/*
+ * This function sets the terminal to RAW mode, as defined for the current
+ * shell. This is called both by ttopen() above and by spawncli() to
+ * get the current terminal settings and then change them to what
+ * mg expects. Thus, tty changes done while spawncli() is in effect
+ * will be reflected in mg.
+ */
+int
+ttraw()
+{
- ttysavedp = TRUE;
+ if (tcgetattr(0, &oldtty) < 0) {
+ ewprintf("ttopen can't get terminal attributes");
+ return(FALSE);
}
-
- if (tcsetattr(0, TCSASOFT | TCSADRAIN, &nt) < 0)
- abort();
+ (void)memcpy(&newtty, &oldtty, sizeof(newtty));
+ /* Set terminal to 'raw' mode and ignore a 'break' */
+ newtty.c_cc[VMIN] = 1;
+ newtty.c_cc[VTIME] = 0;
+ newtty.c_iflag |= IGNBRK;
+ newtty.c_iflag &= ~(BRKINT | PARMRK | INLCR | IGNCR | ICRNL | IXON);
+ newtty.c_oflag &= ~OPOST;
+ newtty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
- ttyactivep = TRUE;
+#if !TCSASOFT
+ /*
+ * If we don't have TCSASOFT, force terminal to
+ * 8 bits, no parity.
+ */
+ newtty.c_iflag &= ~ISTRIP;
+ newtty.c_cflag &= ~(CSIZE | PARENB);
+ newtty.c_cflag |= CS8;
+#endif
+ if (tcsetattr(0, TCSASOFT | TCSADRAIN, &newtty) < 0) {
+ ewprintf("ttopen can't tcsetattr");
+ return(FALSE);
+ }
}
/*
- * This function gets called just
- * before we go back home to the shell. Put all of
- * the terminal parameters back.
+ * This function gets called just before we go back home to the shell.
+ * Put all of the terminal parameters back.
+ * Under UN*X this just calls ttcooked(), but the ttclose() hook is in
+ * because vttidy() in display.c expects it for portability reasons.
*/
+void
ttclose()
{
- if(!ttysavedp || !ttyactivep)
- return;
+
+ if (ttcooked() == FALSE)
+ panic(""); /* ttcooked() already printf'd */
+}
+
+/*
+ * This function restores all terminal settings to their default values,
+ * in anticipation of exiting or suspending the editor.
+ */
+int
+ttcooked()
+{
+
ttflush();
- if (tcsetattr(0, TCSASOFT | TCSADRAIN, &ot) < 0)
- abort();
- ttyactivep = FALSE;
+ if (tcsetattr(0, TCSASOFT | TCSADRAIN, &oldtty) < 0) {
+ ewprintf("ttclose can't tcsetattr");
+ return(FALSE);
+ }
+ return(TRUE);
}
/*
- * Write character to the display.
- * Characters are buffered up, to make things
- * a little bit more efficient.
+ * Write character to the display. Characters are buffered up,
+ * to make things a little bit more efficient.
*/
+void
ttputc(c)
+ int c;
{
if (nobuf >= NOBUF)
/*
* Flush output.
*/
+void
ttflush()
{
if (nobuf != 0) {
- write(1, obuf, nobuf);
+ if (write(1, obuf, nobuf) != nobuf)
+ panic("ttflush write failed");
nobuf = 0;
}
}
* Read character from terminal.
* All 8 bits are returned, so that you can use
* a multi-national terminal.
- *
- * If keyboard 'queue' already has typeahead from a typeahead() call,
- * just return it. Otherwise, make sure we are in blocking i/o mode
- * and read a character.
*/
+int
ttgetc()
{
- int c;
+ char buf[1];
- while (read(0, &c, 1) != 1)
+ while (read(0, &buf[0], 1) != 1)
;
- return (c & 0xFF);
-}
-
-/*
- * Return TRUE if there are characters waiting to be read.
- */
-typeahead()
-{
- int x;
-
- return((ioctl(0, FIONREAD, (char *) &x) < 0) ? 0 : x);
+ return (buf[0] & 0xFF);
}
-
/*
- * panic: print error and die, leaving core file.
- * Don't know why this is needed (daveb).
+ * Set the tty size.
+ * XXX - belongs in tty.c since it uses terminfo vars.
*/
-panic(s)
-char *s;
-{
-
- (void) fputs("panic: ", stderr);
- (void) fputs(s, stderr);
- (void) fputc('\n', stderr);
- abort(); /* To leave a core image. */
-}
-
-
-/*
-** This should check the size of the window, and reset if needed.
-*/
-
+void
setttysize()
{
#ifdef TIOCGWINSZ
- struct winsize winsize;
+ struct winsize winsize;
if (ioctl(0, TIOCGWINSZ, (char *) &winsize) == 0) {
nrow = winsize.ws_row;
ncol = winsize.ws_col;
- } else
+ } else nrow = 0;
#endif
- if ((nrow = lines) <= 0 || (ncol = columns) <= 0) {
+ if ((nrow <= 0 || ncol <= 0) &&
+ ((nrow = lines) <= 0 || (ncol = columns) <= 0)) {
nrow = 24;
ncol = 80;
}
ncol = NCOL;
}
+/*
+ * Returns TRUE if there are characters waiting to be read.
+ */
+int
+typeahead()
+{
+ int x;
+
+ return((ioctl(0, FIONREAD, (char *) &x) < 0) ? 0 : x);
+}
+
+/*
+ * panic - just exit, as quickly as we can.
+ */
+void
+panic(s)
+ char *s;
+{
+
+ (void) fputs("panic: ", stderr);
+ (void) fputs(s, stderr);
+ (void) fputc('\n', stderr);
+ abort(); /* To leave a core image. */
+}
+
#ifndef NO_DPROMPT
/*
- * Return TRUE if we wait without doing anything, else return FALSE.
+ * A program to return TRUE if we wait for 2 seconds without anything
+ * happening, else return FALSE. Cribbed from mod.sources xmodem.
*/
+int
ttwait()
{
- fd_set readfds;
- struct timeval tmout;
+ fd_set readfds;
+ struct timeval tmout;
- FD_ZERO(&readfds);
+ FD_ZERO(&readfds);
FD_SET(0, &readfds);
tmout.tv_sec = 2;
tmout.tv_usec = 0;
if ((select(1, &readfds, NULL, NULL, &tmout)) == 0)
- return(TRUE);
- return(FALSE);
+ return (TRUE);
+ return (FALSE);
}
-#endif NO_DPROMPT
+#endif /* NO_DPROMPT */
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