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dockapps/wmix/wmix.c
Christophe CURIS 2d191d0e6c wmix: do not risk a crash (null-pointer-dereference) if $DISPLAY is not set 
The original code merely assumed that an XOpenDisplay failure was caused
only by incapacity to connect to the X server, but if $DISPLAY was not set
then the fprintf would be given a NULL pointer which it may not appreciate
(depending on the libc in use).
Let's avoid that case and try to provide more info to help the user.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
2014-06-07 21:27:27 +01:00

432 lines
11 KiB
C
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/* WMix 3.0 -- a mixer using the OSS mixer API.
* Copyright (C) 2000, 2001 timecop@japan.co.jp
* Mixer code in version 3.0 based on mixer api library by
* Daniel Richard G. <skunk@mit.edu>, which in turn was based on
* the mixer code in WMix 2.x releases.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <sys/soundcard.h>
#include "include/common.h"
#include "include/mixer.h"
#include "include/misc.h"
#include "include/ui_x.h"
#define VERSION "3.0"
static Display *display;
static char *display_name = NULL;
static char *mixer_device = NULL;
static bool button_pressed = false;
static bool slider_pressed = false;
static double prev_button_press_time = 0.0;
static float display_height;
static float display_width;
Config config;
static int mouse_drag_home_x;
static int mouse_drag_home_y;
static int idle_loop;
static bool verbose;
static char *exclude[SOUND_MIXER_NRDEVICES];
/* local stuff */
static void parse_cli_options(int argc, char **argv);
static void signal_catch(int sig);
static void button_press_event(XButtonEvent *event);
static void button_release_event(XButtonEvent *event);
static void motion_event(XMotionEvent *event);
#define HELP_TEXT \
"WMixer " VERSION " by timecop@japan.co.jp + skunk@mit.edu\n" \
"usage:\n" \
" -d <dsp> connect to remote X display\n" \
" -f <file> parse this config [~/.wmixrc]\n" \
" -m <dev> mixer device [/dev/mixer]\n" \
" -h print this help\n" \
" -v verbose -> id, long name, name\n" \
" -e <name> exclude channel, can be used many times\n" \
static void parse_cli_options(int argc, char **argv)
{
int opt;
int count_exclude = 0 ;
verbose = false ;
while ((opt = getopt(argc, argv, "d:f:hm:ve:")) != EOF) {
switch (opt) {
case 'd':
if (optarg != NULL)
display_name = strdup(optarg);
break;
case 'm':
if (optarg != NULL)
mixer_device = strdup(optarg);
break;
case 'f':
if (optarg != NULL)
if (config.file != NULL)
free(config.file);
config.file = strdup(optarg);
break;
case 'h':
fputs(HELP_TEXT, stdout);
exit(0);
break;
case 'v':
verbose = true;
break;
case 'e':
if (count_exclude < SOUND_MIXER_NRDEVICES) {
exclude[count_exclude] = strdup(optarg);
/* printf("exclude : %s\n", exclude[count_exclude]); */
count_exclude++;
} else
fprintf(stderr, "Warning: You can't exclude this many channels\n");
break;
default:
break;
}
}
exclude[count_exclude] = NULL ;
}
int main(int argc, char **argv)
{
XEvent event;
char *home;
char *pid;
FILE *fp;
memset(&config, 0, sizeof(config));
/* we can theoretically live without a config file */
home = getenv("HOME");
if (home) {
config.file = calloc(1, strlen(home) + 9);
sprintf(config.file, "%s/.wmixrc", home);
}
/* handle writing PID file, silently ignore if we can't do it */
pid = calloc(1, strlen(home) + 10);
sprintf(pid, "%s/.wmix.pid", home);
fp = fopen(pid, "w");
if (fp) {
fprintf(fp, "%d\n", getpid());
fclose(fp);
}
free(pid);
/* default values */
config.mousewheel = 1;
config.scrolltext = 1;
config.wheel_button_up = 4;
config.wheel_button_down = 5;
config.scrollstep = 0.03;
config.osd = 1;
config.osd_color = strdup("green");
parse_cli_options(argc, argv);
config_read();
if (mixer_device == NULL)
mixer_device = "/dev/mixer";
mixer_init(mixer_device, verbose, (const char **)exclude);
mixer_set_channel(0);
display = XOpenDisplay(display_name);
if (display == NULL) {
const char *name;
if (display_name) {
name = display_name;
} else {
name = getenv("DISPLAY");
if (name == NULL) {
fprintf(stderr, "wmix:error: Unable to open display, variable $DISPLAY not set\n");
return EXIT_FAILURE;
}
}
fprintf(stderr, "wmix:error: Unable to open display \"%s\"\n", name);
return EXIT_FAILURE;
}
display_width = (float)DisplayWidth(display, DefaultScreen(display)) / 4.0;
display_height = (float)DisplayHeight(display, DefaultScreen(display)) / 2.0;
dockapp_init(display);
new_window("wmix", 64, 64);
new_osd(DisplayWidth(display, DefaultScreen(display)) - 200, 60);
blit_string("wmix 3.0");
scroll_text(3, 4, 57, true);
ui_update();
/* add click regions */
add_region(1, 37, 36, 25, 25); /* knob */
add_region(2, 4, 42, 27, 15); /* balancer */
add_region(3, 2, 26, 7, 10); /* previous channel */
add_region(4, 10, 26, 7, 10); /* next channel */
add_region(5, 39, 14, 20, 7); /* mute toggle */
add_region(6, 4, 14, 13, 7); /* rec toggle */
add_region(10, 3, 4, 56, 7); /* re-scroll current channel name */
/* setup up/down signal handler */
signal(SIGUSR1, (void *) signal_catch);
signal(SIGUSR2, (void *) signal_catch);
while (true) {
if (button_pressed || slider_pressed || (XPending(display) > 0)) {
XNextEvent(display, &event);
switch (event.type) {
case Expose:
redraw_window();
break;
case ButtonPress:
button_press_event(&event.xbutton);
idle_loop = 0;
break;
case ButtonRelease:
button_release_event(&event.xbutton);
idle_loop = 0;
break;
case MotionNotify:
/* process cursor change, or drag events */
motion_event(&event.xmotion);
idle_loop = 0;
break;
case LeaveNotify:
/* go back to standard cursor */
if ((!button_pressed) && (!slider_pressed))
set_cursor(NORMAL_CURSOR);
break;
case DestroyNotify:
XCloseDisplay(display);
return EXIT_SUCCESS;
default:
break;
}
} else {
usleep(100000);
scroll_text(3, 4, 57, false);
/* rescroll message after some delay */
if (idle_loop++ > 256) {
scroll_text(3, 4, 57, true);
idle_loop = 0;
}
/* get rid of OSD after a few seconds of idle */
if ((idle_loop > 15) && osd_mapped() && !button_pressed) {
unmap_osd();
idle_loop = 0;
}
if (mixer_is_changed())
ui_update();
}
}
return EXIT_SUCCESS;
}
static void signal_catch(int sig)
{
switch (sig) {
case SIGUSR1:
mixer_set_volume_rel(config.scrollstep);
if (!osd_mapped())
map_osd();
if (osd_mapped())
update_osd(mixer_get_volume(), false);
ui_update();
idle_loop = 0;
break;
case SIGUSR2:
mixer_set_volume_rel(-config.scrollstep);
if (!osd_mapped())
map_osd();
if (osd_mapped())
update_osd(mixer_get_volume(), false);
ui_update();
idle_loop = 0;
break;
}
}
static void button_press_event(XButtonEvent *event)
{
double button_press_time = get_current_time();
int x = event->x;
int y = event->y;
bool double_click = false;
/* handle wheel scrolling to adjust volume */
if (config.mousewheel) {
if (event->button == config.wheel_button_up) {
mixer_set_volume_rel(config.scrollstep);
if (!osd_mapped())
map_osd();
if (osd_mapped())
update_osd(mixer_get_volume(), false);
ui_update();
return;
}
if (event->button == config.wheel_button_down) {
mixer_set_volume_rel(-config.scrollstep);
if (!osd_mapped())
map_osd();
if (osd_mapped())
update_osd(mixer_get_volume(), false);
ui_update();
return;
}
}
if ((button_press_time - prev_button_press_time) <= 0.5) {
double_click = true;
prev_button_press_time = 0.0;
} else
prev_button_press_time = button_press_time;
switch (check_region(x, y)) {
case 1: /* on knob */
button_pressed = true;
slider_pressed = false;
mouse_drag_home_x = x;
mouse_drag_home_y = y;
if (double_click) {
mixer_toggle_mute();
ui_update();
}
break;
case 2: /* on slider */
button_pressed = false;
slider_pressed = true;
mouse_drag_home_x = x;
mouse_drag_home_y = y;
if (double_click) {
mixer_set_balance(0.0);
ui_update();
}
break;
case 3: /* previous channel */
mixer_set_channel_rel(-1);
blit_string(config.scrolltext ? mixer_get_channel_name() : mixer_get_short_name());
scroll_text(3, 4, 57, true);
unmap_osd();
map_osd();
ui_update();
break;
case 4: /* next channel */
mixer_set_channel_rel(1);
blit_string(config.scrolltext ? mixer_get_channel_name() : mixer_get_short_name());
scroll_text(3, 4, 57, true);
unmap_osd();
map_osd();
ui_update();
break;
case 5: /* toggle mute */
mixer_toggle_mute();
ui_update();
break;
case 6: /* toggle rec */
mixer_toggle_rec();
ui_update();
break;
case 10:
scroll_text(3, 4, 57, true);
break;
default:
printf("unknown region pressed\n");
break;
}
}
static void button_release_event(XButtonEvent *event)
{
int x = event->x;
int y = event->y;
int region;
region = check_region(x, y);
if (region == 1)
set_cursor(HAND_CURSOR);
button_pressed = false;
slider_pressed = false;
}
static void motion_event(XMotionEvent *event)
{
int x = event->x;
int y = event->y;
int region;
if ((x == mouse_drag_home_x) && (y == mouse_drag_home_y))
return;
region = check_region(x, y);
if (button_pressed) {
if (y != mouse_drag_home_y) {
float delta;
set_cursor(NULL_CURSOR);
delta = (float)(mouse_drag_home_y - y) / display_height;
knob_turn(delta);
if (!osd_mapped())
map_osd();
if (osd_mapped())
update_osd(mixer_get_volume(), false);
}
XWarpPointer(display, None, event->window, x, y, 0, 0,
mouse_drag_home_x, mouse_drag_home_y);
return;
}
if (slider_pressed) {
if (x != mouse_drag_home_x) {
float delta;
set_cursor(NULL_CURSOR);
delta = (float)(x - mouse_drag_home_x) / display_width;
slider_move(delta);
}
XWarpPointer(display, None, event->window, x, y, 0, 0,
mouse_drag_home_x, mouse_drag_home_y);
return;
}
if (region == 1)
set_cursor(HAND_CURSOR);
else if (region == 2)
set_cursor(BAR_CURSOR);
else
set_cursor(NORMAL_CURSOR);
}
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