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elinks/src/terminal/event.c
Witold Filipczyk 2bec2984c4 [dos] Very experimental DOS port based on links-2.26 code
WATT-32 and openssl you must compile yourself.
You must tweak configure options, something like:
--disable-utf-8, etc.
Only checked on dosemu with LFN. Networking lags is a bit.
2022-05-09 18:53:36 +02:00

522 lines
14 KiB
C

/** Event system support routines.
* @file */
#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
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include "elinks.h"
#include "intl/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/text/textarea.h"
#include "viewer/timer.h"
/** Information used for communication between ELinks instances */
struct terminal_interlink {
/** How big the input queue is */
int qlen;
/** How much is free */
int qfreespace;
/** UTF-8 input key value decoding data. */
struct {
unicode_val_T ucs;
int len;
unicode_val_T min;
/** Modifier keys from the key event that carried the
* first byte of the character. We need this because
* ELinks sees e.g. ESC U+00F6 as 0x1B 0xC3 0xB6 and
* converts it to Alt-0xC3 0xB6, attaching the
* modifier to the first byte only. */
term_event_modifier_T modifier;
} utf8;
/** This is the queue of events as coming from the other
* ELinks instance owning the hosting terminal. */
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 = (struct window *)term->windows.next;
if (win->type == WINDOW_TAB) {
win = get_current_tab(term);
assertm(win != NULL, "No tab to send the event to!");
if_assert_failed return;
}
win->handler(win, ev);
}
}
static void
term_send_ucs(struct terminal *term, unicode_val_T u,
term_event_modifier_T modifier)
{
#ifdef CONFIG_UTF8
struct term_event ev;
set_kbd_term_event(&ev, u, modifier);
term_send_event(term, &ev);
#else /* !CONFIG_UTF8 */
struct term_event ev;
const char *recoded;
set_kbd_term_event(&ev, KBD_UNDEF, modifier);
recoded = u2cp_no_nbsp(u, get_terminal_codepage(term));
if (!recoded) recoded = "*";
while (*recoded) {
ev.info.keyboard.key = *recoded;
term_send_event(term, &ev);
recoded++;
}
#endif /* !CONFIG_UTF8 */
}
static void
check_terminal_name(struct terminal *term, struct terminal_info *info)
{
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_UTF8
/* Probably not best place for set this. But now we finally have
* term->spec and term->utf8 should be set before decode session info.
* --Scrool */
term->utf8_cp = is_cp_utf8(get_terminal_codepage(term));
/* Force UTF-8 I/O if the UTF-8 charset is selected. Various
* places assume that the terminal's charset is unibyte if
* UTF-8 I/O is disabled. (bug 827) */
term->utf8_io = term->utf8_cp
|| get_opt_bool_tree(term->spec, "utf_8_io", NULL);
#endif /* CONFIG_UTF8 */
}
#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 interlink_event *ilev)
{
struct terminal_info *info = NULL;
struct terminal_interlink *interlink = term->interlink;
struct term_event tev;
switch (ilev->ev) {
case EVENT_INIT:
if (interlink->qlen < TERMINAL_INFO_SIZE)
return 0;
info = (struct terminal_info *) ilev;
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. */
set_init_term_event(&tev,
ilev->info.size.width,
ilev->info.size.height);
term_send_event(term, &tev);
/* 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;
}
ilev->ev = EVENT_REDRAW;
/* Fall through */
case EVENT_REDRAW:
case EVENT_RESIZE:
set_wh_term_event(&tev, ilev->ev,
ilev->info.size.width,
ilev->info.size.height);
term_send_event(term, &tev);
/* If textarea_data is set and the terminal is not blocked,
* then this resize event must be the result of exiting the
* external editor. */
if (term->textarea_data && term->blocked == -1)
textarea_edit(1, term, NULL, NULL, NULL);
break;
case EVENT_MOUSE:
#ifdef CONFIG_MOUSE
reset_timer();
tev.ev = ilev->ev;
copy_struct(&tev.info.mouse, &ilev->info.mouse);
if (!ignore_mouse_event(term, &tev))
term_send_event(term, &tev);
#endif
break;
case EVENT_KBD:
{
int utf8_io = -1;
int key = ilev->info.keyboard.key;
term_event_modifier_T modifier = ilev->info.keyboard.modifier;
if (key >= 0x100)
key = -key;
reset_timer();
if (key == KBD_CTRL_C) {
destroy_terminal(term);
return 0;
}
/* Character Conversions. */
#ifdef CONFIG_UTF8
/* struct term_event_keyboard carries UCS-4.
* - If the "utf_8_io" option is true or the "charset"
* option refers to UTF-8, then term->utf8_io is true,
* and handle_interlink_event() converts from UTF-8
* to UCS-4.
* - Otherwise, handle_interlink_event() converts from
* the codepage specified with the "charset" option
* to UCS-4. */
utf8_io = term->utf8_io;
#else
/* struct term_event_keyboard carries bytes in the
* charset of the terminal.
* - If the "utf_8_io" option is true, then
* handle_interlink_event() converts from UTF-8 to
* UCS-4, and term_send_ucs() converts from UCS-4 to
* the codepage specified with the "charset" option;
* this codepage cannot be UTF-8.
* - Otherwise, handle_interlink_event() passes the
* bytes straight through. */
utf8_io = get_opt_bool_tree(term->spec, "utf_8_io", NULL);
#endif /* CONFIG_UTF8 */
/* In UTF-8 byte sequences that have more than one byte, the
* first byte is between 0xC0 and 0xFF and the remaining bytes
* are between 0x80 and 0xBF. If there is just one byte, then
* it is between 0x00 and 0x7F and it is straight ASCII.
* (All 'betweens' are inclusive.) */
if (interlink->utf8.len) {
/* A previous call to handle_interlink_event
* got a UTF-8 start byte. */
if (key >= 0x80 && key <= 0xBF && utf8_io) {
/* This is a UTF-8 continuation byte. */
interlink->utf8.ucs <<= 6;
interlink->utf8.ucs |= key & 0x3F;
if (! --interlink->utf8.len) {
unicode_val_T u = interlink->utf8.ucs;
/* UTF-8 allows neither overlong
* sequences nor surrogates. */
if (u < interlink->utf8.min
|| is_utf16_surrogate(u))
u = UCS_REPLACEMENT_CHARACTER;
term_send_ucs(term, u,
term->interlink->utf8.modifier);
}
break;
} else {
/* The byte sequence for this character
* is ending prematurely. Send
* UCS_REPLACEMENT_CHARACTER for the
* terminated character, but don't break;
* let this byte be handled below. */
interlink->utf8.len = 0;
term_send_ucs(term, UCS_REPLACEMENT_CHARACTER,
term->interlink->utf8.modifier);
}
}
/* Note: We know that key <= 0xFF. */
if (key < 0x80 || !utf8_io) {
/* This byte is not part of a multibyte character
* encoding: either it is outside of the ranges for
* UTF-8 start and continuation bytes or UTF-8 I/O mode
* is disabled. */
#ifdef CONFIG_UTF8
if (key >= 0 && !utf8_io) {
/* Not special and UTF-8 mode is disabled:
* recode from the terminal charset to UCS-4. */
key = cp2u(get_terminal_codepage(term), key);
term_send_ucs(term, key, modifier);
break;
}
#endif /* !CONFIG_UTF8 */
/* It must be special (e.g., F1 or Enter)
* or a single-byte UTF-8 character. */
set_kbd_term_event(&tev, key, modifier);
term_send_event(term, &tev);
break;
} else if ((key & 0xC0) == 0xC0 && (key & 0xFE) != 0xFE) {
/* This is a UTF-8 start byte. */
/* Minimum character values for UTF-8 octet
* sequences of each length, from RFC 2279.
* According to the RFC, UTF-8 decoders should
* reject characters that are encoded with
* more octets than necessary. (RFC 3629,
* which ELinks does not yet otherwise follow,
* tightened the "should" to "MUST".) */
static const unicode_val_T min[] = {
0x00000080, /* ... 0x000007FF with 2 octets */
0x00000800, /* ... 0x0000FFFF with 3 octets */
0x00010000, /* ... 0x001FFFFF with 4 octets */
0x00200000, /* ... 0x03FFFFFF with 5 octets */
0x04000000 /* ... 0x7FFFFFFF with 6 octets */
};
unsigned int mask;
int len = 0;
/* Set @len = the number of contiguous 1's
* in the most significant bits of the first
* octet, i.e. @key. It is also the number
* of octets in the character. Leave @mask
* pointing to the first 0 bit found. */
for (mask = 0x80; key & mask; mask >>= 1)
len++;
/* This will hold because @key was checked above. */
assert(len >= 2 && len <= 6);
if_assert_failed goto invalid_utf8_start_byte;
interlink->utf8.min = min[len - 2];
interlink->utf8.len = len - 1;
interlink->utf8.ucs = key & (mask - 1);
interlink->utf8.modifier = modifier;
break;
}
invalid_utf8_start_byte:
term_send_ucs(term, UCS_REPLACEMENT_CHARACTER, modifier);
break;
}
case EVENT_ABORT:
destroy_terminal(term);
return 0;
default:
ERROR(gettext("Bad event %d"), ilev->ev);
}
/* For EVENT_INIT we read a liitle more */
if (info) return TERMINAL_INFO_SIZE + info->length;
return sizeof(*ilev);
}
void
in_term(struct terminal *term)
{
struct terminal_interlink *interlink = term->interlink;
ssize_t r;
char *iq;
/* Mark this as the most recently used terminal. */
move_to_top_of_list(terminals, term);
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 = (struct terminal_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, (char *) strerror(errno));
destroy_terminal(term);
return;
}
interlink->qlen += r;
interlink->qfreespace -= r;
while (interlink->qlen >= sizeof(struct interlink_event)) {
struct interlink_event *ev = (struct interlink_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);
}
}