563 lines
20 KiB
C
563 lines
20 KiB
C
/*
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* vim:ts=8:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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*
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* © 2009 Michael Stapelberg and contributors
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*
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* See file LICENSE for license information.
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*
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* util.c: Utility functions, which can be useful everywhere.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <iconv.h>
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#if defined(__OpenBSD__)
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#include <sys/cdefs.h>
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#endif
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#include <xcb/xcb_icccm.h>
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#include "i3.h"
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#include "data.h"
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#include "table.h"
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#include "layout.h"
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#include "util.h"
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#include "xcb.h"
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#include "client.h"
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#include "log.h"
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#include "ewmh.h"
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#include "manage.h"
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#include "workspace.h"
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#include "ipc.h"
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static iconv_t conversion_descriptor = 0;
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struct keyvalue_table_head by_parent = TAILQ_HEAD_INITIALIZER(by_parent);
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struct keyvalue_table_head by_child = TAILQ_HEAD_INITIALIZER(by_child);
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int min(int a, int b) {
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return (a < b ? a : b);
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}
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int max(int a, int b) {
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return (a > b ? a : b);
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}
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/*
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* Updates *destination with new_value and returns true if it was changed or false
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* if it was the same
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*
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*/
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bool update_if_necessary(uint32_t *destination, const uint32_t new_value) {
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uint32_t old_value = *destination;
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return ((*destination = new_value) != old_value);
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}
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/*
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* The s* functions (safe) are wrappers around malloc, strdup, …, which exits if one of
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* the called functions returns NULL, meaning that there is no more memory available
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*
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*/
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void *smalloc(size_t size) {
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void *result = malloc(size);
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exit_if_null(result, "Error: out of memory (malloc(%zd))\n", size);
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return result;
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}
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void *scalloc(size_t size) {
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void *result = calloc(size, 1);
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exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
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return result;
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}
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char *sstrdup(const char *str) {
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char *result = strdup(str);
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exit_if_null(result, "Error: out of memory (strdup())\n");
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return result;
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}
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/*
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* The table_* functions emulate the behaviour of libxcb-wm, which in libxcb 0.3.4 suddenly
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* vanished. Great.
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*
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*/
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bool table_put(struct keyvalue_table_head *head, uint32_t key, void *value) {
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struct keyvalue_element *element = scalloc(sizeof(struct keyvalue_element));
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element->key = key;
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element->value = value;
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TAILQ_INSERT_TAIL(head, element, elements);
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return true;
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}
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void *table_remove(struct keyvalue_table_head *head, uint32_t key) {
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struct keyvalue_element *element;
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TAILQ_FOREACH(element, head, elements)
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if (element->key == key) {
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void *value = element->value;
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TAILQ_REMOVE(head, element, elements);
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free(element);
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return value;
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}
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return NULL;
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}
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void *table_get(struct keyvalue_table_head *head, uint32_t key) {
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struct keyvalue_element *element;
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TAILQ_FOREACH(element, head, elements)
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if (element->key == key)
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return element->value;
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return NULL;
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}
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/*
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* Starts the given application by passing it through a shell. We use double fork
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* to avoid zombie processes. As the started application’s parent exits (immediately),
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* the application is reparented to init (process-id 1), which correctly handles
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* childs, so we don’t have to do it :-).
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*
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* The shell is determined by looking for the SHELL environment variable. If it
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* does not exist, /bin/sh is used.
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*
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*/
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void start_application(const char *command) {
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if (fork() == 0) {
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/* Child process */
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if (fork() == 0) {
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/* Stores the path of the shell */
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static const char *shell = NULL;
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if (shell == NULL)
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if ((shell = getenv("SHELL")) == NULL)
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shell = "/bin/sh";
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/* This is the child */
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execl(shell, shell, "-c", command, (void*)NULL);
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/* not reached */
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}
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exit(0);
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}
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wait(0);
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}
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/*
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* Checks a generic cookie for errors and quits with the given message if there
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* was an error.
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*
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*/
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void check_error(xcb_connection_t *conn, xcb_void_cookie_t cookie, char *err_message) {
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xcb_generic_error_t *error = xcb_request_check(conn, cookie);
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if (error != NULL) {
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fprintf(stderr, "ERROR: %s (X error %d)\n", err_message , error->error_code);
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xcb_disconnect(conn);
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exit(-1);
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}
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}
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/*
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* Converts the given string to UCS-2 big endian for use with
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* xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
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* a buffer containing the UCS-2 encoded string (16 bit per glyph) is
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* returned. It has to be freed when done.
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*
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*/
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char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
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size_t input_size = strlen(input) + 1;
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/* UCS-2 consumes exactly two bytes for each glyph */
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int buffer_size = input_size * 2;
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char *buffer = smalloc(buffer_size);
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size_t output_size = buffer_size;
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/* We need to use an additional pointer, because iconv() modifies it */
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char *output = buffer;
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/* We convert the input into UCS-2 big endian */
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if (conversion_descriptor == 0) {
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conversion_descriptor = iconv_open("UCS-2BE", "UTF-8");
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if (conversion_descriptor == 0) {
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fprintf(stderr, "error opening the conversion context\n");
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exit(1);
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}
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}
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/* Get the conversion descriptor back to original state */
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iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
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/* Convert our text */
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int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
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if (rc == (size_t)-1) {
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perror("Converting to UCS-2 failed");
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if (real_strlen != NULL)
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*real_strlen = 0;
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return NULL;
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}
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if (real_strlen != NULL)
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*real_strlen = ((buffer_size - output_size) / 2) - 1;
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return buffer;
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}
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/*
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* Returns the client which comes next in focus stack (= was selected before) for
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* the given container, optionally excluding the given client.
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*
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*/
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Client *get_last_focused_client(xcb_connection_t *conn, Container *container, Client *exclude) {
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Client *current;
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SLIST_FOREACH(current, &(container->workspace->focus_stack), focus_clients)
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if ((current->container == container) && ((exclude == NULL) || (current != exclude)))
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return current;
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return NULL;
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}
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/*
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* Sets the given client as focused by updating the data structures correctly,
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* updating the X input focus and finally re-decorating both windows (to signalize
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* the user the new focus situation)
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*
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*/
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void set_focus(xcb_connection_t *conn, Client *client, bool set_anyways) {
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/* The dock window cannot be focused, but enter notifies are still handled correctly */
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if (client->dock)
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return;
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/* Store the old client */
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Client *old_client = SLIST_FIRST(&(c_ws->focus_stack));
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/* Check if the focus needs to be changed at all */
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if (!set_anyways && (old_client == client))
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return;
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/* Store current_row/current_col */
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c_ws->current_row = current_row;
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c_ws->current_col = current_col;
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c_ws = client->workspace;
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ewmh_update_current_desktop();
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/* Load current_col/current_row if we switch to a client without a container */
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current_col = c_ws->current_col;
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current_row = c_ws->current_row;
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/* Update container */
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if (client->container != NULL) {
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client->container->currently_focused = client;
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current_col = client->container->col;
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current_row = client->container->row;
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}
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CLIENT_LOG(client);
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/* Set focus to the entered window, and flush xcb buffer immediately */
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xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, client->child, XCB_CURRENT_TIME);
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ewmh_update_active_window(client->child);
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//xcb_warp_pointer(conn, XCB_NONE, client->child, 0, 0, 0, 0, 10, 10);
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if (client->container != NULL) {
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/* Get the client which was last focused in this particular container, it may be a different
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one than old_client */
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Client *last_focused = get_last_focused_client(conn, client->container, NULL);
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/* In stacking containers, raise the client in respect to the one which was focused before */
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if ((client->container->mode == MODE_STACK || client->container->mode == MODE_TABBED) &&
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client->container->workspace->fullscreen_client == NULL) {
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/* We need to get the client again, this time excluding the current client, because
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* we might have just gone into stacking mode and need to raise */
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Client *last_focused = get_last_focused_client(conn, client->container, client);
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if (last_focused != NULL) {
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DLOG("raising above frame %p / child %p\n", last_focused->frame, last_focused->child);
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uint32_t values[] = { last_focused->frame, XCB_STACK_MODE_ABOVE };
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xcb_configure_window(conn, client->frame, XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
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}
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}
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/* If it is the same one as old_client, we save us the unnecessary redecorate */
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if ((last_focused != NULL) && (last_focused != old_client))
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redecorate_window(conn, last_focused);
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}
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/* If the last client was a floating client, we need to go to the next
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* tiling client in stack and re-decorate it. */
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if (old_client != NULL && client_is_floating(old_client)) {
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DLOG("Coming from floating client, searching next tiling...\n");
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Client *current;
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SLIST_FOREACH(current, &(client->workspace->focus_stack), focus_clients) {
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if (client_is_floating(current))
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continue;
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DLOG("Found window: %p / child %p\n", current->frame, current->child);
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redecorate_window(conn, current);
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break;
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}
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}
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SLIST_REMOVE(&(client->workspace->focus_stack), client, Client, focus_clients);
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SLIST_INSERT_HEAD(&(client->workspace->focus_stack), client, focus_clients);
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/* Clear the urgency flag if set (necessary when i3 sets the flag, for
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* example when automatically putting windows on the workspace of their
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* leader) */
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client->urgent = false;
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workspace_update_urgent_flag(client->workspace);
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/* If we’re in stacking mode, this renders the container to update changes in the title
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bars and to raise the focused client */
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if ((old_client != NULL) && (old_client != client) && !old_client->dock)
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redecorate_window(conn, old_client);
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/* redecorate_window flushes, so we don’t need to */
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redecorate_window(conn, client);
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}
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/*
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* Called when the user switches to another mode or when the container is
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* destroyed and thus needs to be cleaned up.
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*
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*/
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void leave_stack_mode(xcb_connection_t *conn, Container *container) {
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/* When going out of stacking mode, we need to close the window */
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struct Stack_Window *stack_win = &(container->stack_win);
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SLIST_REMOVE(&stack_wins, stack_win, Stack_Window, stack_windows);
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xcb_free_gc(conn, stack_win->pixmap.gc);
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xcb_free_pixmap(conn, stack_win->pixmap.id);
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xcb_destroy_window(conn, stack_win->window);
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stack_win->rect.width = -1;
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stack_win->rect.height = -1;
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}
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/*
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* Switches the layout of the given container taking care of the necessary house-keeping
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*
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*/
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void switch_layout_mode(xcb_connection_t *conn, Container *container, int mode) {
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if (mode == MODE_STACK || mode == MODE_TABBED) {
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/* When we’re already in stacking mode, nothing has to be done */
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if ((mode == MODE_STACK && container->mode == MODE_STACK) ||
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(mode == MODE_TABBED && container->mode == MODE_TABBED))
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return;
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if (container->mode == MODE_STACK || container->mode == MODE_TABBED)
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goto after_stackwin;
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/* When entering stacking mode, we need to open a window on
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* which we can draw the title bars of the clients, it has
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* height 1 because we don’t bother here with calculating the
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* correct height - it will be adjusted when rendering anyways.
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* Also, we need to use max(width, 1) because windows cannot
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* be created with either width == 0 or height == 0. */
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Rect rect = {container->x, container->y, max(container->width, 1), 1};
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uint32_t mask = 0;
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uint32_t values[2];
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/* Don’t generate events for our new window, it should *not* be managed */
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mask |= XCB_CW_OVERRIDE_REDIRECT;
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values[0] = 1;
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/* We want to know when… */
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mask |= XCB_CW_EVENT_MASK;
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values[1] = XCB_EVENT_MASK_ENTER_WINDOW | /* …mouse is moved into our window */
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XCB_EVENT_MASK_BUTTON_PRESS | /* …mouse is pressed */
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XCB_EVENT_MASK_EXPOSURE; /* …our window needs to be redrawn */
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struct Stack_Window *stack_win = &(container->stack_win);
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stack_win->window = create_window(conn, rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, false, mask, values);
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stack_win->rect.height = 0;
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/* Initialize the entry for our cached pixmap. It will be
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* created as soon as it’s needed (see cached_pixmap_prepare). */
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memset(&(stack_win->pixmap), 0, sizeof(struct Cached_Pixmap));
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stack_win->pixmap.referred_rect = &stack_win->rect;
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stack_win->pixmap.referred_drawable = stack_win->window;
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stack_win->container = container;
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SLIST_INSERT_HEAD(&stack_wins, stack_win, stack_windows);
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} else {
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if (container->mode == MODE_STACK || container->mode == MODE_TABBED)
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leave_stack_mode(conn, container);
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}
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after_stackwin:
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container->mode = mode;
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/* Force reconfiguration of each client */
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Client *client;
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CIRCLEQ_FOREACH(client, &(container->clients), clients)
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client->force_reconfigure = true;
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render_layout(conn);
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if (container->currently_focused != NULL) {
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/* We need to make sure that this client is above *each* of the
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* other clients in this container */
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Client *last_focused = get_last_focused_client(conn, container, container->currently_focused);
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CIRCLEQ_FOREACH(client, &(container->clients), clients) {
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if (client == container->currently_focused || client == last_focused)
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continue;
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DLOG("setting %08x below %08x / %08x\n", client->frame, container->currently_focused->frame);
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uint32_t values[] = { container->currently_focused->frame, XCB_STACK_MODE_BELOW };
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xcb_configure_window(conn, client->frame,
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XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
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}
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if (last_focused != NULL) {
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DLOG("Putting last_focused directly underneath the currently focused\n");
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uint32_t values[] = { container->currently_focused->frame, XCB_STACK_MODE_BELOW };
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xcb_configure_window(conn, last_focused->frame,
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XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
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}
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set_focus(conn, container->currently_focused, true);
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}
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}
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/*
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* Gets the first matching client for the given window class/window title.
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* If the paramater specific is set to a specific client, only this one
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* will be checked.
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*
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*/
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Client *get_matching_client(xcb_connection_t *conn, const char *window_classtitle,
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Client *specific) {
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char *to_class, *to_title, *to_title_ucs = NULL;
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int to_title_ucs_len = 0;
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Client *matching = NULL;
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to_class = sstrdup(window_classtitle);
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/* If a title was specified, split both strings at the slash */
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if ((to_title = strstr(to_class, "/")) != NULL) {
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*(to_title++) = '\0';
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/* Convert to UCS-2 */
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to_title_ucs = convert_utf8_to_ucs2(to_title, &to_title_ucs_len);
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}
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/* If we were given a specific client we only check if that one matches */
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if (specific != NULL) {
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if (client_matches_class_name(specific, to_class, to_title, to_title_ucs, to_title_ucs_len))
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matching = specific;
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goto done;
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}
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DLOG("Getting clients for class \"%s\" / title \"%s\"\n", to_class, to_title);
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Workspace *ws;
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TAILQ_FOREACH(ws, workspaces, workspaces) {
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if (ws->output == NULL)
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continue;
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Client *client;
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SLIST_FOREACH(client, &(ws->focus_stack), focus_clients) {
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DLOG("Checking client with class=%s / %s, name=%s\n", client->window_class_instance,
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client->window_class_class, client->name);
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if (!client_matches_class_name(client, to_class, to_title, to_title_ucs, to_title_ucs_len))
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continue;
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matching = client;
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goto done;
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}
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}
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done:
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free(to_class);
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FREE(to_title_ucs);
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return matching;
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}
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/*
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* Goes through the list of arguments (for exec()) and checks if the given argument
|
||
* is present. If not, it copies the arguments (because we cannot realloc it) and
|
||
* appends the given argument.
|
||
*
|
||
*/
|
||
static char **append_argument(char **original, char *argument) {
|
||
int num_args;
|
||
for (num_args = 0; original[num_args] != NULL; num_args++) {
|
||
DLOG("original argument: \"%s\"\n", original[num_args]);
|
||
/* If the argument is already present we return the original pointer */
|
||
if (strcmp(original[num_args], argument) == 0)
|
||
return original;
|
||
}
|
||
/* Copy the original array */
|
||
char **result = smalloc((num_args+2) * sizeof(char*));
|
||
memcpy(result, original, num_args * sizeof(char*));
|
||
result[num_args] = argument;
|
||
result[num_args+1] = NULL;
|
||
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
* Restart i3 in-place
|
||
* appends -a to argument list to disable autostart
|
||
*
|
||
*/
|
||
void i3_restart() {
|
||
restore_geometry(global_conn);
|
||
|
||
ipc_shutdown();
|
||
|
||
LOG("restarting \"%s\"...\n", start_argv[0]);
|
||
/* make sure -a is in the argument list or append it */
|
||
start_argv = append_argument(start_argv, "-a");
|
||
|
||
execvp(start_argv[0], start_argv);
|
||
/* not reached */
|
||
}
|
||
|
||
#if defined(__OpenBSD__)
|
||
|
||
/*
|
||
* Taken from FreeBSD
|
||
* Find the first occurrence of the byte string s in byte string l.
|
||
*
|
||
*/
|
||
void *memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
|
||
register char *cur, *last;
|
||
const char *cl = (const char *)l;
|
||
const char *cs = (const char *)s;
|
||
|
||
/* we need something to compare */
|
||
if (l_len == 0 || s_len == 0)
|
||
return NULL;
|
||
|
||
/* "s" must be smaller or equal to "l" */
|
||
if (l_len < s_len)
|
||
return NULL;
|
||
|
||
/* special case where s_len == 1 */
|
||
if (s_len == 1)
|
||
return memchr(l, (int)*cs, l_len);
|
||
|
||
/* the last position where its possible to find "s" in "l" */
|
||
last = (char *)cl + l_len - s_len;
|
||
|
||
for (cur = (char *)cl; cur <= last; cur++)
|
||
if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
|
||
return cur;
|
||
|
||
return NULL;
|
||
}
|
||
|
||
#endif
|
||
|