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/* BOGL - Ben's Own Graphics Library.
This file is by Edmund GRIMLEY EVANS <edmundo@rano.org>.
Rendering design redone by Red Hat Inc, Alan Cox <alan@redhat.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA. */
/*
* This provides a simple virtual terminal, with delayed refresh
* so that it appears fast even when it isn't being fast.
*/
#define _XOPEN_SOURCE 500
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <unistd.h>
#include "bogl.h"
#include "bogl-bgf.h"
#include "bogl-term.h"
static const unsigned char palette[16][3] =
{
{0x00, 0x00, 0x00}, /* 0: Black. */
{0xaa, 0x00, 0x00}, /* 1: Red. */
{0x00, 0xaa, 0x00}, /* 2: Green. */
{0xaa, 0xaa, 0x00}, /* 3: Brown. */
{0x00, 0x00, 0xaa}, /* 4: Blue. */
{0xaa, 0x00, 0xaa}, /* 5: Magenta. */
{0x00, 0xaa, 0xaa}, /* 6: Cyan. */
{0xaa, 0xaa, 0xaa}, /* 7: Light gray. */
{0x55, 0x55, 0x55}, /* 0: Light Gray. */
{0xff, 0x00, 0x00}, /* 1: Light Red. */
{0x00, 0xff, 0x00}, /* 2: Light Green. */
{0xff, 0xff, 0x00}, /* 3: Yellow. */
{0x00, 0x00, 0xff}, /* 4: Light Blue. */
{0xff, 0x00, 0xff}, /* 5: Light Magenta. */
{0x00, 0xff, 0xff}, /* 6: Light Cyan. */
{0xff, 0xff, 0xff}, /* 7: White. */
};
static int child_pid = 0;
static struct termios ttysave;
static int quit = 0;
/* Out of memory. Give up. */
static void out_of_memory (void)
{
fprintf (stderr, "virtual memory exhausted\n");
abort ();
}
/* Allocate AMT bytes of memory and make sure it succeeded. */
static void *xmalloc (size_t size)
{
void *p;
if (size == 0)
return 0;
p = malloc (size);
if (!p)
out_of_memory ();
return p;
}
/* This first tries the modern Unix98 way of getting a pty, followed by the
* old-fashioned BSD way in case that fails. */
int get_ptytty(int *xptyfd, int *xttyfd)
{
char buf[16];
int i, ptyfd, ttyfd;
ptyfd = open("/dev/ptmx", O_RDWR);
if (ptyfd >= 0) {
const char *slave = ptsname(ptyfd);
if (slave) {
if (grantpt(ptyfd) >= 0) {
if (unlockpt(ptyfd) >= 0) {
ttyfd = open(slave, O_RDWR);
if (ttyfd >= 0) {
*xptyfd = ptyfd, *xttyfd = ttyfd;
return 0;
}
}
}
}
close(ptyfd);
}
for (i = 0; i < 32; i++) {
sprintf(buf, "/dev/pty%c%x", "pqrs"[i/16], i%16);
ptyfd = open(buf, O_RDWR);
if (ptyfd < 0) {
sprintf(buf, "/dev/pty/m%d", i);
ptyfd = open(buf, O_RDWR);
}
if (ptyfd >= 0) {
sprintf(buf, "/dev/tty%c%x", "pqrs"[i/16], i%16);
ttyfd = open(buf, O_RDWR);
if (ttyfd < 0) {
sprintf(buf, "/dev/pty/s%d", i);
ttyfd = open(buf, O_RDWR);
}
if (ttyfd >= 0) {
*xptyfd = ptyfd, *xttyfd = ttyfd;
return 0;
}
close(ptyfd);
return 1;
}
}
return 1;
}
/* Probably I should use this as a signal handler */
void send_hangup(void)
{
if (child_pid)
kill(child_pid, SIGHUP);
}
void sigchld(int sig)
{
int status;
if (waitpid(child_pid, &status, WNOHANG) > 0) {
child_pid = 0;
/* Reset ownership and permissions of ttyfd device? */
tcsetattr(0, TCSAFLUSH, &ttysave);
if (WIFEXITED (status))
exit(WEXITSTATUS (status));
if (WIFSIGNALED (status))
exit(128 + WTERMSIG (status));
if (WIFSTOPPED (status))
exit(128 + WSTOPSIG (status));
exit(status);
}
signal(SIGCHLD, sigchld);
}
void sigterm(int sig)
{
quit = 1;
}
void spawn_shell(int ptyfd, int ttyfd, char * const *command_args)
{
fflush(stdout);
child_pid = fork();
if (child_pid) {
/* Change ownership and permissions of ttyfd device! */
signal(SIGCHLD, sigchld);
return;
}
setenv("TERM", "bterm", 1);
close(ptyfd);
setsid();
ioctl(ttyfd, TIOCSCTTY, (char *)0);
dup2(ttyfd, 0);
dup2(ttyfd, 1);
dup2(ttyfd, 2);
if (ttyfd > 2)
close(ttyfd);
tcsetattr(0, TCSANOW, &ttysave);
setgid(getgid());
setuid(getuid());
execvp(command_args[0], command_args);
exit(127);
}
void set_window_size(int ttyfd, int x, int y)
{
struct winsize win;
win.ws_row = y;
win.ws_col = x;
win.ws_xpixel = 0;
win.ws_xpixel = 0;
ioctl(ttyfd, TIOCSWINSZ, &win);
}
static char *font_name;
static struct bogl_term *term;
void reload_font(int sig)
{
struct bogl_font *font;
font = bogl_mmap_font (font_name);
if (font == NULL)
{
fprintf(stderr, "Bad font\n");
return;
}
/* This leaks a mmap. Since the font reloading feature is only expected
to be used once per session (for instance, in debian-installer, after
the font is replaced with a larger version containing more characters),
we don't worry about the leak. */
free(term->font);
term->font = font;
term->xstep = bogl_font_glyph(term->font, ' ', 0);
term->ystep = bogl_font_height(term->font);
}
/*
* The usage is very simple:
* bterm -f font.bgf [ -l locale ] [ program ]
*/
int main(int argc, char *argv[])
{
struct termios ntio;
int ret;
char buf[8192];
struct timeval tv;
int ptyfd, ttyfd;
struct bogl_font *font;
char *locale = "", *command = NULL;
char **command_args;
int i;
char o = ' ';
int pending = 0;
for (i = 1 ; i < argc ; ++i) {
int done = 0;
if (argv[i][0] == '-')
switch (argv[i][1])
{
case 'f':
case 'l':
o = argv[i][1];
break;
case '-':
done = 1;
break;
default:
printf ("unknown option: %c\n", argv[i][1]);
}
else
switch (o)
{
case ' ':
command = argv[i];
break;
case 'f':
font_name = argv[i];
o = ' ';
break;
case 'l':
locale = argv[i];
o = ' ';
break;
}
if (done)
break;
}
setlocale(LC_CTYPE, locale);
if (font_name == NULL) {
fprintf(stderr, "Usage: %s -f font.bgf [ -l locale ] [ program ]\n", argv[0]);
return 1;
}
if ((font = bogl_mmap_font(font_name)) == NULL) {
fprintf(stderr, "Bad font\n");
return 1;
}
tcgetattr(0, &ttysave);
if (!bogl_init()) {
fprintf(stderr, "bogl: %s\n", bogl_error());
return 1;
}
term = bogl_term_new(font);
if (!term)
exit(1);
bogl_set_palette(0, 16, palette);
bogl_term_redraw(term);
if (get_ptytty(&ptyfd, &ttyfd)) {
perror("can't get a pty");
exit(1);
}
if (command) {
command_args = xmalloc(2 * sizeof *command_args);
command_args[0] = command;
command_args[1] = NULL;
} else if (i < argc - 1) {
int j;
command_args = xmalloc((argc - i) * sizeof *command_args);
for (j = i + 1; j < argc; ++j)
command_args[j - (i + 1)] = argv[j];
command_args[argc - (i + 1)] = NULL;
} else {
command_args = xmalloc(2 * sizeof *command_args);
command_args[0] = "/bin/sh";
command_args[1] = NULL;
}
spawn_shell(ptyfd, ttyfd, command_args);
signal(SIGHUP, reload_font);
signal(SIGTERM, sigterm);
ntio = ttysave;
ntio.c_lflag &= ~(ECHO|ISIG|ICANON|XCASE);
ntio.c_iflag = 0;
ntio.c_oflag &= ~OPOST;
ntio.c_cc[VMIN] = 1;
ntio.c_cc[VTIME] = 0;
ntio.c_cflag |= CS8;
ntio.c_line = 0;
tcsetattr(0, TCSAFLUSH, &ntio);
set_window_size(ttyfd, term->xsize, term->ysize);
for (;;) {
fd_set fds;
int max = 0;
if (quit)
break;
if(pending)
{
tv.tv_sec = 0;
tv.tv_usec = 0;
}
else
{
tv.tv_sec = 10;
tv.tv_usec = 100000;
}
FD_ZERO(&fds);
FD_SET(0, &fds);
FD_SET(ptyfd, &fds);
if (ptyfd > max)
max = ptyfd;
ret = select(max+1, &fds, NULL, NULL, &tv);
if (quit)
break;
if (bogl_refresh) {
/* Handle VT switching. */
if (bogl_refresh == 2)
{
bogl_term_dirty (term);
/* This should not be necessary, but is, due to 2.6 kernel
bugs in the vga16fb driver. */
bogl_set_palette(0, 16, palette);
}
bogl_refresh = 0;
bogl_term_redraw(term);
}
if (ret == 0 || (ret < 0 && errno == EINTR))
{
if(pending)
{
pending = 0;
bogl_term_redraw(term);
}
continue;
}
if (ret < 0)
perror("select");
if (FD_ISSET(0, &fds)) {
ret = read(0, buf, sizeof(buf));
if (ret > 0)
write(ptyfd, buf, ret);
}
else if (FD_ISSET(ptyfd,&fds)) {
ret = read(ptyfd, buf, sizeof(buf));
if (ret > 0)
{
bogl_term_out(term, buf, ret);
pending = 1;
}
}
}
return 0;
}
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