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elinks/src/terminal/event.c

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/* Event system support routines. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "elinks.h"
#include "intl/gettext/libintl.h"
#include "main/main.h" /* terminate */
#include "main/object.h"
#include "session/session.h"
#include "terminal/draw.h"
#include "terminal/event.h"
#include "terminal/kbd.h"
#include "terminal/mouse.h"
#include "terminal/tab.h"
#include "terminal/terminal.h"
#include "terminal/screen.h"
#include "terminal/window.h"
#include "util/conv.h"
#include "util/error.h"
#include "util/memory.h"
#include "util/snprintf.h"
#include "util/string.h"
#include "viewer/timer.h"
/* Information used for communication between ELinks instances */
struct terminal_interlink {
/* How big the input queue is and how much is free */
int qlen;
int qfreespace;
/* UTF8 input key value decoding data. */
struct {
unicode_val_T ucs;
int len;
int min;
} utf_8;
/* This is the queue of events as coming from the other ELinks instance
* owning the hosting terminal. */
unsigned char input_queue[1];
};
void
term_send_event(struct terminal *term, struct term_event *ev)
{
struct window *win;
assert(ev && term);
if_assert_failed return;
switch (ev->ev) {
case EVENT_INIT:
case EVENT_RESIZE:
{
int width = ev->info.size.width;
int height = ev->info.size.height;
if (width < 0 || height < 0) {
ERROR(gettext("Bad terminal size: %d, %d"),
width, height);
break;
}
resize_screen(term, width, height);
erase_screen(term);
/* Fall through */
}
case EVENT_REDRAW:
/* Nasty hack to avoid assertion failures when doing -remote
* stuff and the client exits right away */
if (!term->screen->image) break;
clear_terminal(term);
term->redrawing = TREDRAW_DELAYED;
/* Note that you do NOT want to ever go and create new
* window inside EVENT_INIT handler (it'll get second
* EVENT_INIT here). Perhaps the best thing you could do
* is registering a bottom-half handler which will open
* additional windows.
* --pasky */
if (ev->ev == EVENT_RESIZE) {
/* We want to propagate EVENT_RESIZE even to inactive
* tabs! Nothing wrong will get drawn (in the final
* result) as the active tab is always the first one,
* thus will be drawn last here. Thanks, Witek!
* --pasky */
foreachback (win, term->windows)
win->handler(win, ev);
} else {
foreachback (win, term->windows)
if (!inactive_tab(win))
win->handler(win, ev);
}
term->redrawing = TREDRAW_READY;
break;
case EVENT_MOUSE:
case EVENT_KBD:
case EVENT_ABORT:
assert(!list_empty(term->windows));
if_assert_failed break;
/* We need to send event to correct tab, not to the first one. --karpov */
/* ...if we want to send it to a tab at all. --pasky */
win = term->windows.next;
if (win->type == WINDOW_TAB) {
win = get_current_tab(term);
assertm(win, "No tab to send the event to!");
if_assert_failed return;
}
win->handler(win, ev);
}
}
static void
term_send_ucs(struct terminal *term, struct term_event *ev, unicode_val_T u)
{
unsigned char *recoded;
recoded = u2cp_no_nbsp(u, get_opt_int_tree(term->spec, "charset"));
if (!recoded) recoded = "*";
while (*recoded) {
ev->info.keyboard.key = *recoded;
term_send_event(term, ev);
recoded++;
}
}
static void
check_terminal_name(struct terminal *term, struct terminal_info *info)
{
unsigned char name[MAX_TERM_LEN + 10];
int i;
/* We check TERM env. var for sanity, and fallback to _template_ if
* needed. This way we prevent elinks.conf potential corruption. */
for (i = 0; info->name[i]; i++) {
if (isident(info->name[i])) continue;
usrerror(_("Warning: terminal name contains illicit chars.", term));
return;
}
snprintf(name, sizeof(name), "terminal.%s", info->name);
/* Unlock the default _template_ option tree that was asigned by
* init_term() and get the correct one. */
object_unlock(term->spec);
term->spec = get_opt_rec(config_options, name);
object_lock(term->spec);
}
#ifdef CONFIG_MOUSE
static int
ignore_mouse_event(struct terminal *term, struct term_event *ev)
{
struct term_event_mouse *prev = &term->prev_mouse_event;
struct term_event_mouse *current = &ev->info.mouse;
if (check_mouse_action(ev, B_UP)
&& current->y == prev->y
&& (current->button & ~BM_ACT) == (prev->button & ~BM_ACT)) {
do_not_ignore_next_mouse_event(term);
return 1;
}
copy_struct(prev, current);
return 0;
}
#endif
static int
handle_interlink_event(struct terminal *term, struct term_event *ev)
{
struct terminal_info *info = NULL;
struct terminal_interlink *interlink = term->interlink;
switch (ev->ev) {
case EVENT_INIT:
if (interlink->qlen < TERMINAL_INFO_SIZE)
return 0;
info = (struct terminal_info *) ev;
if (interlink->qlen < TERMINAL_INFO_SIZE + info->length)
return 0;
info->name[MAX_TERM_LEN - 1] = 0;
check_terminal_name(term, info);
memcpy(term->cwd, info->cwd, MAX_CWD_LEN);
term->cwd[MAX_CWD_LEN - 1] = 0;
term->environment = info->system_env;
/* We need to make sure that it is possible to draw on the
* terminal screen before decoding the session info so that
* handling of bad URL syntax by openning msg_box() will be
* possible. */
term_send_event(term, ev);
/* Either the initialization of the first session failed or we
* are doing a remote session so quit.*/
if (!decode_session_info(term, info)) {
destroy_terminal(term);
/* Make sure the user is notified if the initialization
* of the first session fails. */
if (program.terminate) {
usrerror(_("Failed to create session.", term));
program.retval = RET_FATAL;
}
return 0;
}
ev->ev = EVENT_REDRAW;
/* Fall through */
case EVENT_REDRAW:
case EVENT_RESIZE:
term_send_event(term, ev);
break;
case EVENT_MOUSE:
#ifdef CONFIG_MOUSE
reset_timer();
if (!ignore_mouse_event(term, ev))
term_send_event(term, ev);
#endif
break;
case EVENT_KBD:
{
int utf8_io = -1;
int key = get_kbd_key(ev);
reset_timer();
if (check_kbd_modifier(ev, KBD_MOD_CTRL) && toupper(key) == 'L') {
redraw_terminal_cls(term);
break;
} else if (key == KBD_CTRL_C) {
destroy_terminal(term);
return 0;
}
if (interlink->utf_8.len) {
utf8_io = get_opt_bool_tree(term->spec, "utf_8_io");
if ((key & 0xC0) == 0x80 && utf8_io) {
interlink->utf_8.ucs <<= 6;
interlink->utf_8.ucs |= key & 0x3F;
if (! --interlink->utf_8.len) {
unicode_val_T u = interlink->utf_8.ucs;
if (u < interlink->utf_8.min)
u = UCS_NO_CHAR;
term_send_ucs(term, ev, u);
}
break;
} else {
interlink->utf_8.len = 0;
term_send_ucs(term, ev, UCS_NO_CHAR);
}
}
if (key < 0x80 || key > 0xFF
|| (utf8_io == -1
? !get_opt_bool_tree(term->spec, "utf_8_io")
: !utf8_io)) {
term_send_event(term, ev);
break;
} else if ((key & 0xC0) == 0xC0 && (key & 0xFE) != 0xFE) {
unsigned int mask, cov = 0x80;
int len = 0;
for (mask = 0x80; key & mask; mask >>= 1) {
len++;
interlink->utf_8.min = cov;
cov = 1 << (1 + 5 * len);
}
interlink->utf_8.len = len - 1;
interlink->utf_8.ucs = key & (mask - 1);
break;
}
term_send_ucs(term, ev, UCS_NO_CHAR);
break;
}
case EVENT_ABORT:
destroy_terminal(term);
return 0;
default:
ERROR(gettext("Bad event %d"), ev->ev);
}
/* For EVENT_INIT we read a liitle more */
if (info) return TERMINAL_INFO_SIZE + info->length;
return sizeof(*ev);
}
void
in_term(struct terminal *term)
{
struct terminal_interlink *interlink = term->interlink;
ssize_t r;
unsigned char *iq;
if (!interlink
|| !interlink->qfreespace
|| interlink->qfreespace - interlink->qlen > ALLOC_GR) {
int qlen = interlink ? interlink->qlen : 0;
int queuesize = ((qlen + ALLOC_GR) & ~(ALLOC_GR - 1));
int newsize = sizeof(*interlink) + queuesize;
interlink = mem_realloc(interlink, newsize);
if (!interlink) {
destroy_terminal(term);
return;
}
/* Blank the members for the first allocation */
if (!term->interlink)
memset(interlink, 0, sizeof(*interlink));
term->interlink = interlink;
interlink->qfreespace = queuesize - interlink->qlen;
}
iq = interlink->input_queue;
r = safe_read(term->fdin, iq + interlink->qlen, interlink->qfreespace);
if (r <= 0) {
if (r == -1 && errno != ECONNRESET)
ERROR(gettext("Could not read event: %d (%s)"),
errno, (unsigned char *) strerror(errno));
destroy_terminal(term);
return;
}
interlink->qlen += r;
interlink->qfreespace -= r;
while (interlink->qlen >= sizeof(struct term_event)) {
struct term_event *ev = (struct term_event *) iq;
int event_size = handle_interlink_event(term, ev);
/* If the event was not handled save the bytes in the queue for
* later in case more stuff is read later. */
if (!event_size) break;
/* Acount for the handled bytes */
interlink->qlen -= event_size;
interlink->qfreespace += event_size;
/* If there are no more bytes to handle stop else move next
* event bytes to the front of the queue. */
if (!interlink->qlen) break;
memmove(iq, iq + event_size, interlink->qlen);
}
}