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util.c
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util.c
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/*
* vim:ts=8:expandtab
*
* i3 - an improved dynamic tiling window manager
*
* © 2009 Michael Stapelberg and contributors
*
* See file LICENSE for license information.
*
* util.c: Utility functions, which can be useful everywhere.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/wait.h>
#include <stdarg.h>
#include <assert.h>
#include <iconv.h>
#include <xcb/xcb_icccm.h>
#include "i3.h"
#include "data.h"
#include "table.h"
#include "layout.h"
#include "util.h"
#include "xcb.h"
#include "client.h"
static iconv_t conversion_descriptor = 0;
struct keyvalue_table_head by_parent = TAILQ_HEAD_INITIALIZER(by_parent);
struct keyvalue_table_head by_child = TAILQ_HEAD_INITIALIZER(by_child);
int min(int a, int b) {
return (a < b ? a : b);
}
int max(int a, int b) {
return (a > b ? a : b);
}
/*
* Logs the given message to stdout while prefixing the current time to it.
* This is to be called by LOG() which includes filename/linenumber
*
*/
void slog(char *fmt, ...) {
va_list args;
char timebuf[64];
va_start(args, fmt);
/* Get current time */
time_t t = time(NULL);
/* Convert time to local time (determined by the locale) */
struct tm *tmp = localtime(&t);
/* Generate time prefix */
strftime(timebuf, sizeof(timebuf), "%x %X - ", tmp);
printf("%s", timebuf);
vprintf(fmt, args);
va_end(args);
}
/*
* Prints the message (see printf()) to stderr, then exits the program.
*
*/
void die(char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
exit(EXIT_FAILURE);
}
/*
* The s* functions (safe) are wrappers around malloc, strdup, …, which exits if one of
* the called functions returns NULL, meaning that there is no more memory available
*
*/
void *smalloc(size_t size) {
void *result = malloc(size);
exit_if_null(result, "Error: out of memory (malloc(%d))\n", size);
return result;
}
void *scalloc(size_t size) {
void *result = calloc(size, 1);
exit_if_null(result, "Error: out of memory (calloc(%d))\n", size);
return result;
}
char *sstrdup(const char *str) {
char *result = strdup(str);
exit_if_null(result, "Error: out of memory (strdup())\n");
return result;
}
/*
* The table_* functions emulate the behaviour of libxcb-wm, which in libxcb 0.3.4 suddenly
* vanished. Great.
*
*/
bool table_put(struct keyvalue_table_head *head, uint32_t key, void *value) {
struct keyvalue_element *element = scalloc(sizeof(struct keyvalue_element));
element->key = key;
element->value = value;
TAILQ_INSERT_TAIL(head, element, elements);
return true;
}
void *table_remove(struct keyvalue_table_head *head, uint32_t key) {
struct keyvalue_element *element;
TAILQ_FOREACH(element, head, elements)
if (element->key == key) {
void *value = element->value;
TAILQ_REMOVE(head, element, elements);
free(element);
return value;
}
return NULL;
}
void *table_get(struct keyvalue_table_head *head, uint32_t key) {
struct keyvalue_element *element;
TAILQ_FOREACH(element, head, elements)
if (element->key == key)
return element->value;
return NULL;
}
/*
* Starts the given application by passing it through a shell. We use double fork
* to avoid zombie processes. As the started application’s parent exits (immediately),
* the application is reparented to init (process-id 1), which correctly handles
* childs, so we don’t have to do it :-).
*
* The shell is determined by looking for the SHELL environment variable. If it
* does not exist, /bin/sh is used.
*
*/
void start_application(const char *command) {
if (fork() == 0) {
/* Child process */
if (fork() == 0) {
/* Stores the path of the shell */
static const char *shell = NULL;
if (shell == NULL)
if ((shell = getenv("SHELL")) == NULL)
shell = "/bin/sh";
/* This is the child */
execl(shell, shell, "-c", command, NULL);
/* not reached */
}
exit(0);
}
wait(0);
}
/*
* Checks a generic cookie for errors and quits with the given message if there
* was an error.
*
*/
void check_error(xcb_connection_t *conn, xcb_void_cookie_t cookie, char *err_message) {
xcb_generic_error_t *error = xcb_request_check(conn, cookie);
if (error != NULL) {
fprintf(stderr, "ERROR: %s : %d\n", err_message , error->error_code);
xcb_disconnect(conn);
exit(-1);
}
}
/*
* Converts the given string to UCS-2 big endian for use with
* xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
* a buffer containing the UCS-2 encoded string (16 bit per glyph) is
* returned. It has to be freed when done.
*
*/
char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
size_t input_size = strlen(input) + 1;
/* UCS-2 consumes exactly two bytes for each glyph */
int buffer_size = input_size * 2;
char *buffer = smalloc(buffer_size);
size_t output_size = buffer_size;
/* We need to use an additional pointer, because iconv() modifies it */
char *output = buffer;
/* We convert the input into UCS-2 big endian */
if (conversion_descriptor == 0) {
conversion_descriptor = iconv_open("UCS-2BE", "UTF-8");
if (conversion_descriptor == 0) {
fprintf(stderr, "error opening the conversion context\n");
exit(1);
}
}
/* Get the conversion descriptor back to original state */
iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
/* Convert our text */
int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
if (rc == (size_t)-1) {
perror("Converting to UCS-2 failed");
if (real_strlen != NULL)
*real_strlen = 0;
return NULL;
}
if (real_strlen != NULL)
*real_strlen = ((buffer_size - output_size) / 2) - 1;
return buffer;
}
/*
* Returns the client which comes next in focus stack (= was selected before) for
* the given container, optionally excluding the given client.
*
*/
Client *get_last_focused_client(xcb_connection_t *conn, Container *container, Client *exclude) {
Client *current;
SLIST_FOREACH(current, &(container->workspace->focus_stack), focus_clients)
if ((current->container == container) && ((exclude == NULL) || (current != exclude)))
return current;
return NULL;
}
/*
* Unmaps all clients (and stack windows) of the given workspace.
*
* This needs to be called separately when temporarily rendering
* a workspace which is not the active workspace to force
* reconfiguration of all clients, like in src/xinerama.c when
* re-assigning a workspace to another screen.
*
*/
void unmap_workspace(xcb_connection_t *conn, Workspace *u_ws) {
Client *client;
struct Stack_Window *stack_win;
/* Ignore notify events because they would cause focus to be changed */
ignore_enter_notify_forall(conn, u_ws, true);
/* Unmap all clients of the given workspace */
int unmapped_clients = 0;
FOR_TABLE(u_ws)
CIRCLEQ_FOREACH(client, &(u_ws->table[cols][rows]->clients), clients) {
LOG("unmapping normal client %p / %p / %p\n", client, client->frame, client->child);
xcb_unmap_window(conn, client->frame);
unmapped_clients++;
}
/* To find floating clients, we traverse the focus stack */
SLIST_FOREACH(client, &(u_ws->focus_stack), focus_clients) {
if (!client_is_floating(client))
continue;
LOG("unmapping floating client %p / %p / %p\n", client, client->frame, client->child);
xcb_unmap_window(conn, client->frame);
unmapped_clients++;
}
/* If we did not unmap any clients, the workspace is empty and we can destroy it, at least
* if it is not the current workspace. */
if (unmapped_clients == 0 && u_ws != c_ws) {
/* Re-assign the workspace of all dock clients which use this workspace */
Client *dock;
LOG("workspace %p is empty\n", u_ws);
SLIST_FOREACH(dock, &(u_ws->screen->dock_clients), dock_clients) {
if (dock->workspace != u_ws)
continue;
LOG("Re-assigning dock client to c_ws (%p)\n", c_ws);
dock->workspace = c_ws;
}
u_ws->screen = NULL;
}
/* Unmap the stack windows on the given workspace, if any */
SLIST_FOREACH(stack_win, &stack_wins, stack_windows)
if (stack_win->container->workspace == u_ws)
xcb_unmap_window(conn, stack_win->window);
ignore_enter_notify_forall(conn, u_ws, false);
}
/*
* Sets the given client as focused by updating the data structures correctly,
* updating the X input focus and finally re-decorating both windows (to signalize
* the user the new focus situation)
*
*/
void set_focus(xcb_connection_t *conn, Client *client, bool set_anyways) {
/* The dock window cannot be focused, but enter notifies are still handled correctly */
if (client->dock)
return;
/* Store the old client */
Client *old_client = SLIST_FIRST(&(c_ws->focus_stack));
/* Check if the focus needs to be changed at all */
if (!set_anyways && (old_client == client)) {
LOG("old_client == client, not changing focus\n");
return;
}
/* Store current_row/current_col */
c_ws->current_row = current_row;
c_ws->current_col = current_col;
c_ws = client->workspace;
/* Load current_col/current_row if we switch to a client without a container */
current_col = c_ws->current_col;
current_row = c_ws->current_row;
/* Update container */
if (client->container != NULL) {
client->container->currently_focused = client;
current_col = client->container->col;
current_row = client->container->row;
}
LOG("set_focus(frame %08x, child %08x, name %s)\n", client->frame, client->child, client->name);
/* Set focus to the entered window, and flush xcb buffer immediately */
xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, client->child, XCB_CURRENT_TIME);
//xcb_warp_pointer(conn, XCB_NONE, client->child, 0, 0, 0, 0, 10, 10);
if (client->container != NULL) {
/* Get the client which was last focused in this particular container, it may be a different
one than old_client */
Client *last_focused = get_last_focused_client(conn, client->container, NULL);
/* In stacking containers, raise the client in respect to the one which was focused before */
if (client->container->mode == MODE_STACK && client->container->workspace->fullscreen_client == NULL) {
/* We need to get the client again, this time excluding the current client, because
* we might have just gone into stacking mode and need to raise */
Client *last_focused = get_last_focused_client(conn, client->container, client);
if (last_focused != NULL) {
LOG("raising above frame %p / child %p\n", last_focused->frame, last_focused->child);
uint32_t values[] = { last_focused->frame, XCB_STACK_MODE_ABOVE };
xcb_configure_window(conn, client->frame, XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
}
}
/* If it is the same one as old_client, we save us the unnecessary redecorate */
if ((last_focused != NULL) && (last_focused != old_client))
redecorate_window(conn, last_focused);
}
/* If we’re in stacking mode, this renders the container to update changes in the title
bars and to raise the focused client */
if ((old_client != NULL) && (old_client != client) && !old_client->dock)
redecorate_window(conn, old_client);
SLIST_REMOVE(&(client->workspace->focus_stack), client, Client, focus_clients);
SLIST_INSERT_HEAD(&(client->workspace->focus_stack), client, focus_clients);
/* redecorate_window flushes, so we don’t need to */
redecorate_window(conn, client);
}
/*
* Called when the user switches to another mode or when the container is
* destroyed and thus needs to be cleaned up.
*
*/
void leave_stack_mode(xcb_connection_t *conn, Container *container) {
/* When going out of stacking mode, we need to close the window */
struct Stack_Window *stack_win = &(container->stack_win);
SLIST_REMOVE(&stack_wins, stack_win, Stack_Window, stack_windows);
xcb_free_gc(conn, stack_win->gc);
xcb_destroy_window(conn, stack_win->window);
stack_win->rect.width = -1;
stack_win->rect.height = -1;
}
/*
* Switches the layout of the given container taking care of the necessary house-keeping
*
*/
void switch_layout_mode(xcb_connection_t *conn, Container *container, int mode) {
if (mode == MODE_STACK) {
/* When we’re already in stacking mode, nothing has to be done */
if (container->mode == MODE_STACK)
return;
/* When entering stacking mode, we need to open a window on which we can draw the
title bars of the clients, it has height 1 because we don’t bother here with
calculating the correct height - it will be adjusted when rendering anyways. */
Rect rect = {container->x, container->y, container->width, 1};
uint32_t mask = 0;
uint32_t values[2];
/* Don’t generate events for our new window, it should *not* be managed */
mask |= XCB_CW_OVERRIDE_REDIRECT;
values[0] = 1;
/* We want to know when… */
mask |= XCB_CW_EVENT_MASK;
values[1] = XCB_EVENT_MASK_ENTER_WINDOW | /* …mouse is moved into our window */
XCB_EVENT_MASK_BUTTON_PRESS | /* …mouse is pressed */
XCB_EVENT_MASK_EXPOSURE; /* …our window needs to be redrawn */
struct Stack_Window *stack_win = &(container->stack_win);
stack_win->window = create_window(conn, rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, mask, values);
/* Generate a graphics context for the titlebar */
stack_win->gc = xcb_generate_id(conn);
xcb_create_gc(conn, stack_win->gc, stack_win->window, 0, 0);
stack_win->container = container;
SLIST_INSERT_HEAD(&stack_wins, stack_win, stack_windows);
} else {
if (container->mode == MODE_STACK)
leave_stack_mode(conn, container);
}
container->mode = mode;
/* Force reconfiguration of each client */
Client *client;
CIRCLEQ_FOREACH(client, &(container->clients), clients)
client->force_reconfigure = true;
render_layout(conn);
if (container->currently_focused != NULL) {
/* We need to make sure that this client is above *each* of the
* other clients in this container */
Client *last_focused = get_last_focused_client(conn, container, container->currently_focused);
CIRCLEQ_FOREACH(client, &(container->clients), clients) {
if (client == container->currently_focused || client == last_focused)
continue;
LOG("setting %08x below %08x / %08x\n", client->frame, container->currently_focused->frame);
uint32_t values[] = { container->currently_focused->frame, XCB_STACK_MODE_BELOW };
xcb_configure_window(conn, client->frame,
XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
}
if (last_focused != NULL) {
LOG("Putting last_focused directly underneath the currently focused\n");
uint32_t values[] = { container->currently_focused->frame, XCB_STACK_MODE_BELOW };
xcb_configure_window(conn, last_focused->frame,
XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
}
set_focus(conn, container->currently_focused, true);
}
}
/*
* Gets the first matching client for the given window class/window title.
* If the paramater specific is set to a specific client, only this one
* will be checked.
*
*/
Client *get_matching_client(xcb_connection_t *conn, const char *window_classtitle,
Client *specific) {
char *to_class, *to_title, *to_title_ucs = NULL;
int to_title_ucs_len = 0;
Client *matching = NULL;
to_class = sstrdup(window_classtitle);
/* If a title was specified, split both strings at the slash */
if ((to_title = strstr(to_class, "/")) != NULL) {
*(to_title++) = '\0';
/* Convert to UCS-2 */
to_title_ucs = convert_utf8_to_ucs2(to_title, &to_title_ucs_len);
}
/* If we were given a specific client we only check if that one matches */
if (specific != NULL) {
if (client_matches_class_name(specific, to_class, to_title, to_title_ucs, to_title_ucs_len))
matching = specific;
goto done;
}
LOG("Getting clients for class \"%s\" / title \"%s\"\n", to_class, to_title);
for (int workspace = 0; workspace < 10; workspace++) {
if (workspaces[workspace].screen == NULL)
continue;
Client *client;
SLIST_FOREACH(client, &(workspaces[workspace].focus_stack), focus_clients) {
LOG("Checking client with class=%s, name=%s\n", client->window_class, client->name);
if (!client_matches_class_name(client, to_class, to_title, to_title_ucs, to_title_ucs_len))
continue;
matching = client;
goto done;
}
}
done:
free(to_class);
FREE(to_title_ucs);
return matching;
}