blob: a173d8efda4c945fa1b2d0ea00b07e28b202e7ff [file] [log] [blame]
Pascal Bellarda8b594f2010-06-21 02:17:29 +02001/* vi: set sw=4 ts=4: */
2/*
3 * A text-mode VNC like program for Linux virtual terminals.
4 *
5 * pascal.bellard@ads-lu.com
6 *
7 * Based on Russell Stuart's conspy.c
8 * http://ace-host.stuart.id.au/russell/files/conspy.c
9 *
10 * Licensed under GPLv2 or later, see file License in this tarball for details.
Pascal Bellarda8b594f2010-06-21 02:17:29 +020011 */
12
13//applet:IF_CONSPY(APPLET(conspy, _BB_DIR_BIN, _BB_SUID_DROP))
14
15//kbuild:lib-$(CONFIG_CONSPY) += conspy.o
16
17//config:config CONSPY
18//config: bool "conspy"
19//config: default n
Jeremie Koenig1d7266d2010-07-19 00:44:56 +020020//config: depends on PLATFORM_LINUX
Pascal Bellarda8b594f2010-06-21 02:17:29 +020021//config: help
22//config: A text-mode VNC like program for Linux virtual terminals.
Denys Vlasenko1a3b0712010-06-27 20:42:17 +020023//config: example: conspy NUM shared access to console num
24//config: or conspy -nd NUM screenshot of console num
25//config: or conspy -cs NUM poor man's GNU screen like
Pascal Bellarda8b594f2010-06-21 02:17:29 +020026
27//usage:#define conspy_trivial_usage
Denys Vlasenko1a3b0712010-06-27 20:42:17 +020028//usage: "[-vcsndf] [-x COL] [-y LINE] [CONSOLE_NO]"
Pascal Bellarda8b594f2010-06-21 02:17:29 +020029//usage:#define conspy_full_usage "\n\n"
30//usage: "A text-mode VNC like program for Linux virtual consoles."
31//usage: "\nTo exit, quickly press ESC 3 times."
32//usage: "\n"
33//usage: "\nOptions:"
34//usage: "\n -v Don't send keystrokes to the console"
35//usage: "\n -c Create missing devices in /dev"
36//usage: "\n -s Open a SHELL session"
37//usage: "\n -n Black & white"
38//usage: "\n -d Dump console to stdout"
39//usage: "\n -f Follow cursor"
Denys Vlasenko1a3b0712010-06-27 20:42:17 +020040//usage: "\n -x COL Starting column"
Pascal Bellarda8b594f2010-06-21 02:17:29 +020041//usage: "\n -y LINE Starting line"
42
43#include "libbb.h"
44#include <sys/kd.h>
45
46struct screen_info {
Denys Vlasenko1a3b0712010-06-27 20:42:17 +020047 unsigned char lines, cols, cursor_x, cursor_y;
Pascal Bellarda8b594f2010-06-21 02:17:29 +020048};
49
Pascal Bellardfa5ea172010-06-30 07:05:31 +020050#define CHAR(x) (*(uint8_t*)(x))
51#define ATTR(x) (((uint8_t*)(x))[1])
52#define NEXT(x) ((x) += 2)
Denys Vlasenko51fa1472010-06-25 00:57:57 +020053#define DATA(x) (*(uint16_t*)(x))
Pascal Bellarda8b594f2010-06-21 02:17:29 +020054
55struct globals {
56 char* data;
57 int size;
58 int x, y;
59 int kbd_fd;
Pascal Bellard1b8e2b02010-06-23 20:25:00 +020060 int ioerror_count;
61 int key_count;
62 int escape_count;
63 int nokeys;
64 int current;
Pascal Bellardfa5ea172010-06-30 07:05:31 +020065 int first_line_offset;
66 int last_attr;
Pascal Bellardff377992010-06-28 15:50:22 +020067 // cached local tty parameters
68 unsigned width;
69 unsigned height;
70 unsigned col;
71 unsigned line;
Pascal Bellardfa5ea172010-06-30 07:05:31 +020072 smallint curoff; // unknown:0 cursor on:-1 cursor off:1
Pascal Bellardff377992010-06-28 15:50:22 +020073 char attrbuf[sizeof("\033[0;1;5;30;40m")];
74 // remote console
Denys Vlasenko1a3b0712010-06-27 20:42:17 +020075 struct screen_info remote;
Pascal Bellardff377992010-06-28 15:50:22 +020076 // saved local tty terminfo
Pascal Bellarda8b594f2010-06-21 02:17:29 +020077 struct termios term_orig;
Pascal Bellardfa5ea172010-06-30 07:05:31 +020078 char vcsa_name[sizeof("/dev/vcsaNN")];
Pascal Bellarda8b594f2010-06-21 02:17:29 +020079};
80
81#define G (*ptr_to_globals)
82#define INIT_G() do { \
83 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
Pascal Bellardff377992010-06-28 15:50:22 +020084 G.attrbuf[0] = '\033'; \
85 G.attrbuf[1] = '['; \
Pascal Bellardfa5ea172010-06-30 07:05:31 +020086 G.width = G.height = UINT_MAX; \
87 G.last_attr--; \
Pascal Bellarda8b594f2010-06-21 02:17:29 +020088} while (0)
89
Denys Vlasenko05a550b2010-06-21 04:00:16 +020090enum {
91 FLAG_v, // view only
92 FLAG_c, // create device if need
93 FLAG_s, // session
94 FLAG_n, // no colors
95 FLAG_d, // dump screen
96 FLAG_f, // follow cursor
97};
98#define FLAG(x) (1 << FLAG_##x)
99#define BW (option_mask32 & FLAG(n))
100
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200101static void clrscr(void)
102{
103 // Home, clear till end of screen
104 fputs("\033[1;1H" "\033[J", stdout);
105 G.col = G.line = 0;
106}
107
108static void set_cursor(int state)
109{
110 if (G.curoff != state) {
111 G.curoff = state;
112 fputs("\033[?25", stdout);
113 bb_putchar("h?l"[1 + state]);
114 }
115}
116
117static void gotoxy(int col, int line)
118{
119 if (G.col != col || G.line != line) {
120 G.col = col;
121 G.line = line;
122 printf("\033[%u;%uH", line + 1, col + 1);
123 }
124}
125
126static void cleanup(int code)
127{
128 set_cursor(-1); // cursor on
129 tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
130 if (ENABLE_FEATURE_CLEAN_UP) {
131 close(G.kbd_fd);
132 }
133 // Reset attributes
134 if (!BW)
135 fputs("\033[0m", stdout);
136 bb_putchar('\n');
137 if (code > 1)
138 kill_myself_with_sig(code);
139 exit(code);
140}
141
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200142static void screen_read_close(void)
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200143{
144 unsigned i, j;
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200145 int vcsa_fd;
146 char *data;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200147
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200148 // Close & re-open vcsa in case they have swapped virtual consoles
149 vcsa_fd = xopen(G.vcsa_name, O_RDONLY);
150 xread(vcsa_fd, &G.remote, 4);
151 i = G.remote.cols * 2;
152 G.first_line_offset = G.y * i;
153 i *= G.remote.lines;
154 if (G.data == NULL) {
155 G.size = i;
156 G.data = xzalloc(2 * i);
157 }
158 else if (G.size != i) {
159 cleanup(1);
160 }
161 data = G.data + G.current;
162 xread(vcsa_fd, data, G.size);
163 close(vcsa_fd);
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200164 for (i = 0; i < G.remote.lines; i++) {
165 for (j = 0; j < G.remote.cols; j++, NEXT(data)) {
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200166 unsigned x = j - G.x; // if will catch j < G.x too
167 unsigned y = i - G.y; // if will catch i < G.y too
168
169 if (CHAR(data) < ' ')
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200170 CHAR(data) = ' ';
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200171 if (y >= G.height || x >= G.width)
172 DATA(data) = 0;
173 }
174 }
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200175}
176
177static void screen_char(char *data)
178{
Pascal Bellardff377992010-06-28 15:50:22 +0200179 if (!BW) {
180 uint8_t attr = ATTR(data);
181 //uint8_t attr = ATTR(data) >> 1; // for framebuffer console
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200182 uint8_t attr_diff = G.last_attr ^ attr;
Denys Vlasenkoa54985b2010-06-24 17:50:00 +0200183
Pascal Bellardff377992010-06-28 15:50:22 +0200184 if (attr_diff) {
Denys Vlasenkoa54985b2010-06-24 17:50:00 +0200185// Attribute layout for VGA compatible text videobuffer:
186// blinking text
187// |red bkgd
188// ||green bkgd
189// |||blue bkgd
190// vvvv
191// 00000000 <- lsb bit on the right
192// bold text / text 8th bit
193// red text
194// green text
195// blue text
196// TODO: apparently framebuffer-based console uses different layout
197// (bug? attempt to get 8th text bit in better position?)
198// red bkgd
199// |green bkgd
200// ||blue bkgd
201// vvv
202// 00000000 <- lsb bit on the right
203// bold text
204// red text
205// green text
206// blue text
207// text 8th bit
Pascal Bellardff377992010-06-28 15:50:22 +0200208 // converting RGB color bit triad to BGR:
209 static const char color[8] = "04261537";
210 const uint8_t fg_mask = 0x07, bold_mask = 0x08;
211 const uint8_t bg_mask = 0x70, blink_mask = 0x80;
212 char *ptr;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200213
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200214 ptr = G.attrbuf + 2; // skip "ESC ["
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200215
Pascal Bellardff377992010-06-28 15:50:22 +0200216 // (G.last_attr & ~attr) has 1 only where
217 // G.last_attr has 1 but attr has 0.
218 // Here we check whether we have transition
219 // bold->non-bold or blink->non-blink:
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200220 if (G.last_attr < 0 // initial value
221 || ((G.last_attr & ~attr) & (bold_mask | blink_mask)) != 0
222 ) {
Pascal Bellardff377992010-06-28 15:50:22 +0200223 *ptr++ = '0'; // "reset all attrs"
224 *ptr++ = ';';
225 // must set fg & bg, maybe need to set bold or blink:
226 attr_diff = attr | ~(bold_mask | blink_mask);
227 }
Pascal Bellardff377992010-06-28 15:50:22 +0200228 G.last_attr = attr;
229 if (attr_diff & bold_mask) {
230 *ptr++ = '1';
231 *ptr++ = ';';
232 }
233 if (attr_diff & blink_mask) {
234 *ptr++ = '5';
235 *ptr++ = ';';
236 }
237 if (attr_diff & fg_mask) {
238 *ptr++ = '3';
239 *ptr++ = color[attr & fg_mask];
240 *ptr++ = ';';
241 }
242 if (attr_diff & bg_mask) {
243 *ptr++ = '4';
244 *ptr++ = color[(attr & bg_mask) >> 4];
245 *ptr++ = ';';
246 }
247 if (ptr != G.attrbuf + 2) {
248 ptr[-1] = 'm';
249 *ptr = '\0';
250 fputs(G.attrbuf, stdout);
251 }
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200252 }
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200253 }
Denys Vlasenkoa54985b2010-06-24 17:50:00 +0200254 putchar(CHAR(data));
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200255 G.col++;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200256}
257
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200258static void screen_dump(void)
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200259{
Denys Vlasenko05a550b2010-06-21 04:00:16 +0200260 int linefeed_cnt;
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200261 int line, col;
262 int linecnt = G.remote.lines - G.y;
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200263 char *data = G.data + G.current + G.first_line_offset;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200264
Denys Vlasenko05a550b2010-06-21 04:00:16 +0200265 linefeed_cnt = 0;
266 for (line = 0; line < linecnt && line < G.height; line++) {
267 int space_cnt = 0;
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200268 for (col = 0; col < G.remote.cols; col++, NEXT(data)) {
269 unsigned tty_col = col - G.x; // if will catch col < G.x too
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200270
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200271 if (tty_col >= G.width)
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200272 continue;
Denys Vlasenko05a550b2010-06-21 04:00:16 +0200273 space_cnt++;
Denys Vlasenko51fa1472010-06-25 00:57:57 +0200274 if (BW && CHAR(data) == ' ')
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200275 continue;
Denys Vlasenko05a550b2010-06-21 04:00:16 +0200276 while (linefeed_cnt != 0) {
Denys Vlasenko51fa1472010-06-25 00:57:57 +0200277 //bb_putchar('\r'); - tty driver does it for us
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200278 bb_putchar('\n');
Denys Vlasenko05a550b2010-06-21 04:00:16 +0200279 linefeed_cnt--;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200280 }
Denys Vlasenko05a550b2010-06-21 04:00:16 +0200281 while (--space_cnt)
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200282 bb_putchar(' ');
283 screen_char(data);
284 }
Denys Vlasenko05a550b2010-06-21 04:00:16 +0200285 linefeed_cnt++;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200286 }
287}
288
289static void curmove(void)
290{
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200291 unsigned cx = G.remote.cursor_x - G.x;
292 unsigned cy = G.remote.cursor_y - G.y;
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200293 int cursor = 1;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200294
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200295 if (cx < G.width && cy < G.height) {
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200296 gotoxy(cx, cy);
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200297 cursor = -1;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200298 }
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200299 set_cursor(cursor);
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200300}
301
302static void create_cdev_if_doesnt_exist(const char* name, dev_t dev)
303{
304 int fd = open(name, O_RDONLY);
305 if (fd != -1)
306 close(fd);
307 else if (errno == ENOENT)
308 mknod(name, S_IFCHR | 0660, dev);
309}
310
311static NOINLINE void start_shell_in_child(const char* tty_name)
312{
Pascal Bellard926031b2010-07-04 15:32:38 +0200313 int pid = xvfork();
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200314 if (pid == 0) {
315 struct termios termchild;
316 char *shell = getenv("SHELL");
317
318 if (!shell)
319 shell = (char *) DEFAULT_SHELL;
320 signal(SIGHUP, SIG_IGN);
321 // set tty as a controlling tty
322 setsid();
323 // make tty to be input, output, error
324 close(0);
325 xopen(tty_name, O_RDWR); // uses fd 0
326 xdup2(0, 1);
327 xdup2(0, 2);
328 ioctl(0, TIOCSCTTY, 1);
329 tcsetpgrp(0, getpid());
330 tcgetattr(0, &termchild);
331 termchild.c_lflag |= ECHO;
332 termchild.c_oflag |= ONLCR | XTABS;
333 termchild.c_iflag |= ICRNL;
334 termchild.c_iflag &= ~IXOFF;
335 tcsetattr_stdin_TCSANOW(&termchild);
336 execl(shell, shell, "-i", (char *) NULL);
337 bb_simple_perror_msg_and_die(shell);
338 }
339}
340
Denys Vlasenko51fa1472010-06-25 00:57:57 +0200341int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200342int conspy_main(int argc UNUSED_PARAM, char **argv)
343{
Denys Vlasenko51fa1472010-06-25 00:57:57 +0200344 char tty_name[sizeof("/dev/ttyNN")];
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200345#define keybuf bb_common_bufsiz1
346 struct termios termbuf;
347 unsigned opts;
348 unsigned ttynum;
349 int poll_timeout_ms;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200350#if ENABLE_LONG_OPTS
351 static const char getopt_longopts[] ALIGN1 =
352 "viewonly\0" No_argument "v"
353 "createdevice\0" No_argument "c"
354 "session\0" No_argument "s"
355 "nocolors\0" No_argument "n"
356 "dump\0" No_argument "d"
357 "follow\0" No_argument "f"
358 ;
359
360 applet_long_options = getopt_longopts;
361#endif
362 INIT_G();
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200363 strcpy(G.vcsa_name, "/dev/vcsa");
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200364
365 opt_complementary = "x+:y+"; // numeric params
366 opts = getopt32(argv, "vcsndfx:y:", &G.x, &G.y);
367 argv += optind;
368 ttynum = 0;
369 if (argv[0]) {
370 ttynum = xatou_range(argv[0], 0, 63);
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200371 sprintf(G.vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200372 }
373 sprintf(tty_name, "%s%u", "/dev/tty", ttynum);
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200374 if (opts & FLAG(c)) {
375 if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
376 create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200377 create_cdev_if_doesnt_exist(G.vcsa_name, makedev(7, 128 + ttynum));
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200378 }
379 if ((opts & FLAG(s)) && ttynum) {
380 start_shell_in_child(tty_name);
381 }
382
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200383 screen_read_close();
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200384 if (opts & FLAG(d)) {
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200385 screen_dump();
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200386 bb_putchar('\n');
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200387 return 0;
388 }
389
390 bb_signals(BB_FATAL_SIGS, cleanup);
Denys Vlasenko918f4442010-06-25 14:40:25 +0200391
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200392 // All characters must be passed through to us unaltered
Denys Vlasenko918f4442010-06-25 14:40:25 +0200393 G.kbd_fd = xopen(CURRENT_TTY, O_RDONLY);
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200394 tcgetattr(G.kbd_fd, &G.term_orig);
395 termbuf = G.term_orig;
396 termbuf.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
Denys Vlasenko51fa1472010-06-25 00:57:57 +0200397 //termbuf.c_oflag &= ~(OPOST); - no, we still want \n -> \r\n
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200398 termbuf.c_lflag &= ~(ISIG|ICANON|ECHO);
399 termbuf.c_cc[VMIN] = 1;
400 termbuf.c_cc[VTIME] = 0;
401 tcsetattr(G.kbd_fd, TCSANOW, &termbuf);
Pascal Bellardff377992010-06-28 15:50:22 +0200402
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200403 poll_timeout_ms = 250;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200404 while (1) {
405 struct pollfd pfd;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200406 int bytes_read;
407 int i, j;
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200408 char *data, *old;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200409
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200410 // in the first loop G.width = G.height = 0: refresh
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200411 i = G.width;
412 j = G.height;
413 get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200414 if (option_mask32 & FLAG(f)) {
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200415 int nx = G.remote.cursor_x - G.width + 1;
416 int ny = G.remote.cursor_y - G.height + 1;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200417
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200418 if (G.remote.cursor_x < G.x) {
419 G.x = G.remote.cursor_x;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200420 i = 0; // force refresh
421 }
422 if (nx > G.x) {
423 G.x = nx;
424 i = 0; // force refresh
425 }
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200426 if (G.remote.cursor_y < G.y) {
427 G.y = G.remote.cursor_y;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200428 i = 0; // force refresh
429 }
430 if (ny > G.y) {
431 G.y = ny;
432 i = 0; // force refresh
433 }
434 }
435
436 // Scan console data and redraw our tty where needed
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200437 old = G.data + G.current;
438 G.current = G.size - G.current;
439 data = G.data + G.current;
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200440 screen_read_close();
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200441 if (i != G.width || j != G.height) {
442 clrscr();
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200443 screen_dump();
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200444 } else {
445 // For each remote line
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200446 old += G.first_line_offset;
447 data += G.first_line_offset;
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200448 for (i = G.y; i < G.remote.lines; i++) {
449 char *first = NULL; // first char which needs updating
450 char *last = last; // last char which needs updating
451 unsigned iy = i - G.y;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200452
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200453 if (iy >= G.height)
454 break;
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200455 for (j = 0; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
456 unsigned jx = j - G.x; // if will catch j >= G.x too
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200457
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200458 if (jx < G.width && DATA(data) != DATA(old)) {
459 last = data;
460 if (!first) {
461 first = data;
462 gotoxy(jx, iy);
463 }
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200464 }
465 }
Denys Vlasenko1a3b0712010-06-27 20:42:17 +0200466 if (first) {
467 // Rewrite updated data on the local screen
468 for (; first <= last; NEXT(first))
469 screen_char(first);
470 }
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200471 }
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200472 }
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200473 curmove();
474
475 // Wait for local user keypresses
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200476 fflush_all();
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200477 pfd.fd = G.kbd_fd;
478 pfd.events = POLLIN;
479 bytes_read = 0;
480 switch (poll(&pfd, 1, poll_timeout_ms)) {
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200481 char *k;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200482 case -1:
483 if (errno != EINTR)
484 cleanup(1);
485 break;
486 case 0:
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200487 if (++G.nokeys >= 4)
488 G.nokeys = G.escape_count = 0;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200489 break;
490 default:
491 // Read the keys pressed
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200492 k = keybuf + G.key_count;
493 bytes_read = read(G.kbd_fd, k, sizeof(keybuf) - G.key_count);
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200494 if (bytes_read < 0)
495 cleanup(1);
496
497 // Do exit processing
498 for (i = 0; i < bytes_read; i++) {
Denys Vlasenko51fa1472010-06-25 00:57:57 +0200499 if (k[i] != '\033')
500 G.escape_count = 0;
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200501 else if (++G.escape_count >= 3)
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200502 cleanup(0);
503 }
504 }
505 poll_timeout_ms = 250;
506
507 // Insert all keys pressed into the virtual console's input
508 // buffer. Don't do this if the virtual console is in scan
509 // code mode - giving ASCII characters to a program expecting
510 // scan codes will confuse it.
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200511 if (!(option_mask32 & FLAG(v)) && G.escape_count == 0) {
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200512 int handle, result;
513 long kbd_mode;
514
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200515 G.key_count += bytes_read;
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200516 handle = xopen(tty_name, O_WRONLY);
517 result = ioctl(handle, KDGKBMODE, &kbd_mode);
Pascal Bellard81199672010-07-01 07:18:41 +0200518 if (result >= 0) {
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200519 char *p = keybuf;
Pascal Bellard81199672010-07-01 07:18:41 +0200520
521 if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE) {
522 G.key_count = 0; // scan code mode
523 }
524 for (; G.key_count != 0; p++, G.key_count--) {
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200525 result = ioctl(handle, TIOCSTI, p);
Pascal Bellard81199672010-07-01 07:18:41 +0200526 if (result < 0) {
527 memmove(keybuf, p, G.key_count);
528 break;
529 }
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200530 // If there is an application on console which reacts
531 // to keypresses, we need to make our first sleep
532 // shorter to quickly redraw whatever it printed there.
533 poll_timeout_ms = 20;
534 }
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200535 }
536 // Close & re-open tty in case they have
537 // swapped virtual consoles
538 close(handle);
539
540 // We sometimes get spurious IO errors on the TTY
541 // as programs close and re-open it
Pascal Bellard81199672010-07-01 07:18:41 +0200542 if (result >= 0)
Pascal Bellard1b8e2b02010-06-23 20:25:00 +0200543 G.ioerror_count = 0;
544 else if (errno != EIO || ++G.ioerror_count > 4)
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200545 cleanup(1);
546 }
Pascal Bellardfa5ea172010-06-30 07:05:31 +0200547 } /* while (1) */
Pascal Bellarda8b594f2010-06-21 02:17:29 +0200548}