neko/server/internal/xorg/xorg.c

#include "xorg.h"

static clipboard_c *CLIPBOARD = NULL;
static Display *DISPLAY = NULL;
static char *NAME = ":0.0";
static int REGISTERED = 0;
static int DIRTY = 0;

struct linked_list
{
    unsigned long number;
    int keycode;
    struct linked_list *next;
};

typedef struct linked_list node;
node *head=NULL, *last=NULL;

void insertAtLast(unsigned long value, int keycode) {
  node *temp_node;
  temp_node = (node *) malloc(sizeof(node));

  temp_node->number = value;
  temp_node->keycode = keycode;
  temp_node->next = NULL;

  //For the 1st element
  if(head == NULL) {
    head = temp_node;
    last = temp_node;
  } else {
    last->next = temp_node;
    last = temp_node;
  }
}

void deleteItem(int value) {
  node *myNode = head, *previous=NULL;

  while(myNode!=NULL) {
    if(myNode->number==value) {
      if(previous==NULL)
        head = myNode->next;
      else
        previous->next = myNode->next;

      free(myNode); //need to free up the memory to prevent memory leak
      break;
    }

    previous = myNode;
    myNode = myNode->next;
  }
}

int searchItem(int value) {
  node *searchNode = head;
  int flag = 0;

  while(searchNode != NULL) {
    if(searchNode->number==value) {
      flag = searchNode->keycode;
      break;
    } else {
      searchNode = searchNode->next;
    }
  }

  return flag;
}

Display *getXDisplay(void) {
  /* Close the display if displayName has changed */
  if (DIRTY) {
    XDisplayClose();
    DIRTY = 0;
  }

  if (DISPLAY == NULL) {
    /* First try the user set displayName */
    DISPLAY = XOpenDisplay(NAME);

    /* Then try using environment variable DISPLAY */
    if (DISPLAY == NULL) {
      DISPLAY = XOpenDisplay(NULL);
    }

    if (DISPLAY == NULL) {
      fputs("Could not open main display\n", stderr);
    } else if (!REGISTERED) {
      atexit(&XDisplayClose);
      REGISTERED = 1;
    }
  }

  return DISPLAY;
}

clipboard_c *getClipboard(void) {
  if (CLIPBOARD == NULL) {
    CLIPBOARD = clipboard_new(NULL);
  }
  return CLIPBOARD;
}

void XDisplayClose(void) {
  if (DISPLAY != NULL) {
    XCloseDisplay(DISPLAY);
    DISPLAY = NULL;
  }
}

void XDisplaySet(char *input) {
  NAME = strdup(input);
  DIRTY = 1;
}

void XMove(int x, int y) {
  Display *display = getXDisplay();
  XWarpPointer(display, None, DefaultRootWindow(display),  0, 0, 0, 0, x, y);
  XSync(display, 0);
}

void XScroll(int x, int y) {
  int ydir = 4; /* Button 4 is up, 5 is down. */
  int xdir = 6;

  Display *display = getXDisplay();

  if (y < 0) {
    ydir = 5;
  }

  if (x < 0) {
    xdir = 7;
  }

  int xi;
  int yi;

  for (xi = 0; xi < abs(x); xi++) {
    XTestFakeButtonEvent(display, xdir, 1, CurrentTime);
    XTestFakeButtonEvent(display, xdir, 0, CurrentTime);
  }

  for (yi = 0; yi < abs(y); yi++) {
    XTestFakeButtonEvent(display, ydir, 1, CurrentTime);
    XTestFakeButtonEvent(display, ydir, 0, CurrentTime);
  }

  XSync(display, 0);
}

void XButton(unsigned int button, int down) {
  if (button != 0) {
    Display *display = getXDisplay();
    XTestFakeButtonEvent(display, button, down, CurrentTime);
    XSync(display, 0);
  }
}

KeyCode XkbKeysymToKeycode(KeySym keysym) {
  XkbDescPtr xkb;
  XkbStateRec state;
  unsigned keycode;
  Display *dpy = getXDisplay();

  xkb = XkbGetMap(dpy, XkbAllComponentsMask, XkbUseCoreKbd);
  if (!xkb)
    return 0;

  XkbGetState(dpy, XkbUseCoreKbd, &state);

  for (keycode = xkb->min_key_code;
       keycode <= xkb->max_key_code;
       keycode++) {
    KeySym cursym;
    unsigned int mods;
    XkbTranslateKeyCode(xkb, keycode, state.compat_state, &mods, &cursym);
    if (cursym == keysym)
      break;
  }

  if (keycode > xkb->max_key_code)
    keycode = 0;

  XkbFreeKeyboard(xkb, XkbAllComponentsMask, True);

  return keycode;
}

void XKey(unsigned long key, int down) {
  if (key != 0) {
    Display *display = getXDisplay();
//    KeyCode code = XKeysymToKeycode(display, key);

    int code;

    if (down) {
      code = searchItem(key);
      if (code == 0) {
        // XKeysymToKeycode() doesn't respect state, so we have to use
        // something slightly more complex
        code = XkbKeysymToKeycode(key);
        // Map non-existing keysyms to new keycodes
        if(code == 0) {
          int min, max, numcodes;
          XDisplayKeycodes(display, &min, &max);
          XGetKeyboardMapping(display, min, max-min, &numcodes);

          code = (max-min+1)*numcodes;
          KeySym keysym_list[numcodes];
          for(int i=0;i<numcodes;i++) keysym_list[i] = key;
            XChangeKeyboardMapping(display, code, numcodes, keysym_list, 1);
        }

	insertAtLast(key, code);
      }
    } else {
      code = searchItem(key);
      deleteItem(key);
    }

    XTestFakeKeyEvent(display, code, down, CurrentTime);
    XSync(display, 0);
  }
}

void XClipboardSet(char *src) {
  clipboard_c *cb = getClipboard();
  clipboard_set_text_ex(cb, src, strlen(src), 0);
}

char *XClipboardGet() {
  clipboard_c *cb = getClipboard();
  return clipboard_text_ex(cb, NULL, 0);
}

void XGetScreenConfigurations() {
  Display       *display = getXDisplay();
  Window        root = RootWindow(display, 0);
  XRRScreenSize *xrrs;
  int           num_sizes;

  xrrs = XRRSizes(display, 0, &num_sizes);
  for(int i = 0; i < num_sizes; i ++) {
    short *rates;
    int   num_rates;

    goCreateScreenSize(i, xrrs[i].width, xrrs[i].height, xrrs[i].mwidth, xrrs[i].mheight);
    rates = XRRRates(display, 0, i, &num_rates);
    for (int j = 0; j < num_rates; j ++) {
      goSetScreenRates(i, j, rates[j]);
    }
  }
}

void XSetScreenConfiguration(int index, short rate) {
  Display *display = getXDisplay();
  Window root = RootWindow(display, 0);
  XRRSetScreenConfigAndRate(display, XRRGetScreenInfo(display, root), root, index, RR_Rotate_0, rate, CurrentTime);
}

int XGetScreenSize() {
  Display *display = getXDisplay();
  XRRScreenConfiguration *conf  = XRRGetScreenInfo(display, RootWindow(display, 0));
  Rotation original_rotation;
  return XRRConfigCurrentConfiguration(conf, &original_rotation);
}

short XGetScreenRate() {
  Display *display = getXDisplay();
  XRRScreenConfiguration *conf  = XRRGetScreenInfo(display, RootWindow(display, 0));
  return XRRConfigCurrentRate(conf);
}

void SetKeyboardModifiers(int num_lock, int caps_lock, int scroll_lock) {
  Display *display = getXDisplay();

  if (num_lock != -1) {
    XkbLockModifiers(display, XkbUseCoreKbd, 16, num_lock * 16);
  }

  if (caps_lock != -1) {
    XkbLockModifiers(display, XkbUseCoreKbd, 2, caps_lock * 2);
  }

  if (scroll_lock != -1) {
    XKeyboardControl values;
    values.led_mode = scroll_lock ? LedModeOn : LedModeOff;
    values.led = 3;
    XChangeKeyboardControl(display, KBLedMode, &values);
  }

  XFlush(display);
}