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/*
* POSIX terminal I/O.
*
* The functions in this file
* negotiate with the operating system for
* keyboard characters, and write characters to
* the display in a barely buffered fashion.
*/
#include "def.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <termios.h>
#include <term.h>
#define NOBUF 512 /* Output buffer size. */
#ifndef TCSASOFT
#define TCSASOFT 0
#endif
char obuf[NOBUF]; /* Output buffer. */
int nobuf; /* Buffer count. */
struct termios oldtty; /* POSIX tty settings. */
struct termios newtty;
int nrow; /* Terminal size, rows. */
int ncol; /* Terminal size, columns. */
/*
* 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()
{
if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO))
panic("standard input and output must be a terminal");
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()
{
if (tcgetattr(0, &oldtty) < 0) {
ewprintf("ttopen can't get terminal attributes");
return(FALSE);
}
(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);
#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);
}
return(TRUE);
}
/*
* 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 (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, &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.
*/
int
ttputc(c)
int c;
{
if (nobuf >= NOBUF)
ttflush();
obuf[nobuf++] = c;
return(c);
}
/*
* Flush output.
*/
void
ttflush()
{
if (nobuf != 0) {
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.
*/
int
ttgetc()
{
char c;
while (read(0, &c, 1) != 1)
;
return ((int) c);
}
/*
* Set the tty size.
* XXX - belongs in tty.c since it uses terminfo vars.
*/
void
setttysize()
{
#ifdef TIOCGWINSZ
struct winsize winsize;
if (ioctl(0, TIOCGWINSZ, (char *) &winsize) == 0) {
nrow = winsize.ws_row;
ncol = winsize.ws_col;
} else nrow = 0;
#endif
if ((nrow <= 0 || ncol <= 0) &&
((nrow = lines) <= 0 || (ncol = columns) <= 0)) {
nrow = 24;
ncol = 80;
}
/* Enforce maximum screen size. */
if (nrow > NROW)
nrow = NROW;
if (ncol > NCOL)
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);
exit(1);
}
#ifndef NO_DPROMPT
/*
* 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_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);
}
#endif /* NO_DPROMPT */
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