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jstest.c

/*
 * jstest.c  Version 1.2
 *
 * Copyright (c) 1996-1999 Vojtech Pavlik
 *
 * Sponsored by SuSE
 */

/*
 * This program can be used to test all the features of the Linux
 * joystick API, including non-blocking and select() access, as
 * well as version 0.x compatibility mode. It is also intended to
 * serve as an example implementation for those who wish to learn
 * how to write their own joystick using applications.
 */

/*
 * 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 <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>

#include <linux/input.h>
#include <linux/joystick.h>

#include "axbtnmap.h"

char *axis_names[ABS_MAX + 1] = {
"X", "Y", "Z", "Rx", "Ry", "Rz", "Throttle", "Rudder", 
"Wheel", "Gas", "Brake", "?", "?", "?", "?", "?",
"Hat0X", "Hat0Y", "Hat1X", "Hat1Y", "Hat2X", "Hat2Y", "Hat3X", "Hat3Y",
"?", "?", "?", "?", "?", "?", "?", 
};

char *button_names[KEY_MAX - BTN_MISC + 1] = {
"Btn0", "Btn1", "Btn2", "Btn3", "Btn4", "Btn5", "Btn6", "Btn7", "Btn8", "Btn9", "?", "?", "?", "?", "?", "?",
"LeftBtn", "RightBtn", "MiddleBtn", "SideBtn", "ExtraBtn", "ForwardBtn", "BackBtn", "TaskBtn", "?", "?", "?", "?", "?", "?", "?", "?",
"Trigger", "ThumbBtn", "ThumbBtn2", "TopBtn", "TopBtn2", "PinkieBtn", "BaseBtn", "BaseBtn2", "BaseBtn3", "BaseBtn4", "BaseBtn5", "BaseBtn6", "BtnDead",
"BtnA", "BtnB", "BtnC", "BtnX", "BtnY", "BtnZ", "BtnTL", "BtnTR", "BtnTL2", "BtnTR2", "BtnSelect", "BtnStart", "BtnMode", "BtnThumbL", "BtnThumbR", "?",
"?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", 
"WheelBtn", "Gear up",
};

#define NAME_LENGTH 128

int main (int argc, char **argv)
{
      int fd, i;
      unsigned char axes = 2;
      unsigned char buttons = 2;
      int version = 0x000800;
      char name[NAME_LENGTH] = "Unknown";
      uint16_t btnmap[BTNMAP_SIZE];
      uint8_t axmap[AXMAP_SIZE];
      int btnmapok = 1;

      if (argc < 2 || argc > 3 || !strcmp("--help", argv[1])) {
            puts("");
            puts("Usage: jstest [<mode>] <device>");
            puts("");
            puts("Modes:");
            puts("  --normal           One-line mode showing immediate status");
            puts("  --old              Same as --normal, using 0.x interface");
            puts("  --event            Prints events as they come in");
            puts("  --nonblock         Same as --event, in nonblocking mode");
            puts("  --select           Same as --event, using select() call");
            puts("");
            return 1;
      }
      if ((fd = open(argv[argc - 1], O_RDONLY)) < 0) {
            perror("jstest");
            return 1;
      }

      ioctl(fd, JSIOCGVERSION, &version);
      ioctl(fd, JSIOCGAXES, &axes);
      ioctl(fd, JSIOCGBUTTONS, &buttons);
      ioctl(fd, JSIOCGNAME(NAME_LENGTH), name);

      getaxmap(fd, axmap);
      getbtnmap(fd, btnmap);

      printf("Driver version is %d.%d.%d.\n",
            version >> 16, (version >> 8) & 0xff, version & 0xff);

      /* Determine whether the button map is usable. */
      for (i = 0; btnmapok && i < buttons; i++) {
            if (btnmap[i] < BTN_MISC || btnmap[i] > KEY_MAX) {
                  btnmapok = 0;
                  break;
            }
      }
      if (!btnmapok) {
            /* btnmap out of range for names. Don't print any. */
            puts("jstest is not fully compatible with your kernel. Unable to retrieve button map!");
            printf("Joystick (%s) has %d axes ", name, axes);
            printf("and %d buttons.\n", buttons);
      } else {
            printf("Joystick (%s) has %d axes (", name, axes);
            for (i = 0; i < axes; i++)
                  printf("%s%s", i > 0 ? ", " : "", axis_names[axmap[i]]);
            puts(")");

            printf("and %d buttons (", buttons);
            for (i = 0; i < buttons; i++) {
                  printf("%s%s", i > 0 ? ", " : "", button_names[btnmap[i] - BTN_MISC]);
            }
            puts(").");
      }

      printf("Testing ... (interrupt to exit)\n");

/*
 * Old (0.x) interface.
 */

      if ((argc == 2 && version < 0x010000) || !strcmp("--old", argv[1])) {

            struct JS_DATA_TYPE js;

            while (1) {

                  if (read(fd, &js, JS_RETURN) != JS_RETURN) {
                        perror("\njstest: error reading");
                        return 1;
                  }

                  printf("Axes: X:%3d Y:%3d Buttons: A:%s B:%s\r",
                        js.x, js.y, (js.buttons & 1) ? "on " : "off", (js.buttons & 2) ? "on " : "off");

                  fflush(stdout);

                  usleep(10000);
            }
      }

/*
 * Event interface, single line readout.
 */

      if (argc == 2 || !strcmp("--normal", argv[1])) {

            int *axis;
            char *button;
            int i;
            struct js_event js;

            axis = calloc(axes, sizeof(int));
            button = calloc(buttons, sizeof(char));

            while (1) {
                  if (read(fd, &js, sizeof(struct js_event)) != sizeof(struct js_event)) {
                        perror("\njstest: error reading");
                        return 1;
                  }

                  switch(js.type & ~JS_EVENT_INIT) {
                  case JS_EVENT_BUTTON:
                        button[js.number] = js.value;
                        break;
                  case JS_EVENT_AXIS:
                        axis[js.number] = js.value;
                        break;
                  }

                  printf("\r");

                  if (axes) {
                        printf("Axes: ");
                        for (i = 0; i < axes; i++)
                              printf("%2d:%6d ", i, axis[i]);
                  }

                  if (buttons) {
                        printf("Buttons: ");
                        for (i = 0; i < buttons; i++)
                              printf("%2d:%s ", i, button[i] ? "on " : "off");
                  }

                  fflush(stdout);
            }
      }


/*
 * Event interface, events being printed.
 */

      if (!strcmp("--event", argv[1])) {

            struct js_event js;

            while (1) {
                  if (read(fd, &js, sizeof(struct js_event)) != sizeof(struct js_event)) {
                        perror("\njstest: error reading");
                        return 1;
                  }

                  printf("Event: type %d, time %d, number %d, value %d\n",
                        js.type, js.time, js.number, js.value);

                  fflush(stdout);
            }
      }

/*
 * Reading in nonblocking mode.
 */

      if (!strcmp("--nonblock", argv[1])) {

            struct js_event js;

            fcntl(fd, F_SETFL, O_NONBLOCK);

            while (1) {

                  while (read(fd, &js, sizeof(struct js_event)) == sizeof(struct js_event))  {
                        printf("Event: type %d, time %d, number %d, value %d\n",
                              js.type, js.time, js.number, js.value);
                  }

                  if (errno != EAGAIN) {
                        perror("\njstest: error reading");
                        return 1;
                  }

                  usleep(10000);
            }
      }

/*
 * Using select() on joystick fd.
 */

      if (!strcmp("--select", argv[1])) {

            struct js_event js;
            struct timeval tv;
            fd_set set;

            tv.tv_sec = 1;
            tv.tv_usec = 0;

            while (1) {

                  FD_ZERO(&set);
                  FD_SET(fd, &set);

                  if (select(fd+1, &set, NULL, NULL, &tv)) {

                        if (read(fd, &js, sizeof(struct js_event)) != sizeof(struct js_event)) {
                              perror("\njstest: error reading");
                              return 1;
                        }

                        printf("Event: type %d, time %d, number %d, value %d\n",
                              js.type, js.time, js.number, js.value);

                  }

            }
      }

      printf("jstest: unknown mode: %s\n", argv[1]);
      return -1;
}

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