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mse/src/changetty.c

194 lines
3.7 KiB

/*
** changetty.c
**
** Localize in one place all the data and functions
** needed to change to and from cbreak mode for
** the se screen editor.
**
** Only functions available to rest of se are:
** ttyedit(), ttynormal(), and getspeed().
**
** If USG is defined, we use the System V TTY driver.
** Otherwise (the default) we use the Berkeley terminal driver.
**
** If we are using System V, then the Release 2 version does not
** need ospeed. If not release 2, we assume Release 1 that someone
** have moved the BSD termlib to.
**
** This file is part of mse, under GPLv3.
*/
#include "config.h"
#include "ascii.h"
#include "constdefs.h"
#include "changetty.h"
#include "main.h"
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#else
/* fallback to termio */
#ifdef HAVE_TERMIO_H
#include <termio.h>
#endif
#endif
extern short ospeed; /* from the termlib library */
static int set_ospeed = NO;
static TTYINFO OldTtyInfo; /* initial state of terminal */
static TTYINFO NewTtyInfo; /* modified state for editing */
static int first = YES; /* first time anything called */
void init(void)
{
if (gttyinfo(1, &OldTtyInfo) == -1) /* get current state */
{
error (NO, "couldn't get TTY info from system. get help!\n");
}
NewTtyInfo = OldTtyInfo; /* copy it */
mttyinfo(&NewTtyInfo); /* change, but don't reset terminal */
/* really should check the return value here ... */
}
void ttyedit(void) /* set the terminal to correct modes for editing */
{
if (first == YES)
{
first = NO;
init();
}
sttyinfo(1, &NewTtyInfo); /* make the change */
/* really should check the return value here too ... */
}
void ttynormal(void) /* set the terminal to correct modes for normal use */
{
if (first)
{
first = NO;
init();
}
sttyinfo(1, &OldTtyInfo); /* make the change */
}
/* getspeed --- find out the terminal speed in characters/second */
/* this routine only used if terminal types are hardwired */
/* into se, however, since it will be in an archive, the */
/* loader won't grab it if it isn't needed. */
int getspeed(int fd)
{
int i;
TTYINFO ttybuf;
static struct brstruct {
int unixrate;
int cps;
int baudrate;
} stab[] = {
B0, 0, 0,
B50, 5, 50,
B75, 8, 75,
B110, 10, 110,
B134, 14, 134,
B150, 15, 150,
B200, 20, 200,
B300, 30, 300,
B600, 60, 600,
B1200, 120, 1200,
B1800, 180, 1800,
B2400, 240, 2400,
B4800, 480, 4800,
B9600, 960, 9600
};
if (first) /* might as well set it here, too */
{
first = NO;
init();
}
if (gttyinfo(fd, &ttybuf) == -1)
{
return 960;
}
for (i = 0; i < sizeof(stab) / sizeof(struct brstruct); i++)
{
if (stab[i].unixrate == (ttybuf.c_cflag & 017))
{
return stab[i].cps;
}
}
return 960;
}
/* gttyinfo --- make all necessary calls to obtain terminal status */
int gttyinfo(int fd, TTYINFO *buf)
{
#ifdef HAVE_TCGETATTR
if (tcgetattr(fd, buf))
{
return -1;
}
#else
if (ioctl(fd, TCGETA, buf) < 0)
{
return -1;
}
#endif
if (set_ospeed == NO)
{
set_ospeed = YES;
ospeed = buf->c_cflag & 017;
}
return 0;
}
/* mttyinfo --- modify a TTYINFO structure for interactive operation */
int mttyinfo(TTYINFO *buf)
{
buf->c_cc[0] = DLE; /* interrupt */
buf->c_cc[1] = -1; /* ignore quit */
buf->c_cc[4] = 1; /* min # chars to read */
buf->c_cc[5] = 1; /* min time to wait */
buf->c_iflag &= ~(INLCR|IGNCR|ICRNL); /* allow CR to come thru */
buf->c_lflag |= ISIG|NOFLSH; /* keep these bits */
buf->c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL
#ifdef XCASE
|XCASE
#endif
);
return 0;
}
/* sttyinfo --- make all necessary calls to set terminal status */
int sttyinfo(int fd, TTYINFO *buf)
{
#ifdef HAVE_TCSETATTR
if (tcsetattr(fd, TCSANOW, buf) < 0)
#else
if (ioctl(fd, TCSETAW, buf) < 0)
#endif
{
return -1;
} else {
return 0;
}
}