conspy: add framebuffer support, -Q option.
Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Pascal Bellard
Denys Vlasenko
parent
74b871febb
commit
f9e07e70bb
@ -25,25 +25,31 @@
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//config: or conspy -cs NUM poor man's GNU screen like
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//usage:#define conspy_trivial_usage
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//usage: "[-vcsndf] [-x COL] [-y LINE] [CONSOLE_NO]"
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//usage: "[-vcsndfFQ] [-x COL] [-y LINE] [CONSOLE_NO]"
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//usage:#define conspy_full_usage "\n\n"
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//usage: "A text-mode VNC like program for Linux virtual consoles."
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//usage: "\nTo exit, quickly press ESC 3 times."
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//usage: "\n"
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//usage: "\n -v Don't send keystrokes to the console"
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//usage: "\n -c Create missing devices in /dev"
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//usage: "\n -c Create missing /dev/{tty,vcsa}N"
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//usage: "\n -s Open a SHELL session"
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//usage: "\n -n Black & white"
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//usage: "\n -d Dump console to stdout"
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//usage: "\n -f Follow cursor"
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//usage: "\n -F Assume console is on a framebuffer device"
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//usage: "\n -Q Disable exit on ESC-ESC-ESC"
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//usage: "\n -x COL Starting column"
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//usage: "\n -y LINE Starting line"
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#include "libbb.h"
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#include <sys/kd.h>
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#define ESC "\033"
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#define CURSOR_ON -1
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#define CURSOR_OFF 1
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#define DEV_TTY "/dev/tty"
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#define DEV_VCSA "/dev/vcsa"
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struct screen_info {
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unsigned char lines, cols, cursor_x, cursor_y;
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@ -72,19 +78,17 @@ struct globals {
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unsigned col;
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unsigned line;
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smallint curoff; // unknown:0 cursor on:-1 cursor off:1
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char attrbuf[sizeof(ESC"[0;1;5;30;40m")];
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char attrbuf[sizeof("0;1;5;30;40m")];
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// remote console
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struct screen_info remote;
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// saved local tty terminfo
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struct termios term_orig;
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char vcsa_name[sizeof("/dev/vcsaNN")];
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char vcsa_name[sizeof(DEV_VCSA "NN")];
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};
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#define G (*ptr_to_globals)
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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G.attrbuf[0] = '\033'; \
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G.attrbuf[1] = '['; \
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G.width = G.height = UINT_MAX; \
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G.last_attr--; \
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} while (0)
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@ -92,18 +96,26 @@ struct globals {
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enum {
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FLAG_v, // view only
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FLAG_c, // create device if need
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FLAG_Q, // never exit
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FLAG_s, // session
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FLAG_n, // no colors
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FLAG_d, // dump screen
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FLAG_f, // follow cursor
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FLAG_F, // framebuffer
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};
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#define FLAG(x) (1 << FLAG_##x)
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#define BW (option_mask32 & FLAG(n))
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static void putcsi(const char *s)
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{
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fputs(ESC"[", stdout);
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fputs(s, stdout);
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}
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static void clrscr(void)
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{
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// Home, clear till end of screen
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fputs(ESC"[1;1H" ESC"[J", stdout);
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putcsi("1;1H" ESC"[J");
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G.col = G.line = 0;
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}
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@ -111,7 +123,7 @@ static void set_cursor(int state)
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{
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if (G.curoff != state) {
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G.curoff = state;
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fputs(ESC"[?25", stdout);
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putcsi("?25");
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bb_putchar("h?l"[1 + state]);
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}
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}
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@ -125,18 +137,19 @@ static void gotoxy(int col, int line)
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}
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}
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static void cleanup(int code) NORETURN;
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static void cleanup(int code)
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{
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set_cursor(-1); // cursor on
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set_cursor(CURSOR_ON);
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tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(G.kbd_fd);
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}
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// Reset attributes
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if (!BW)
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fputs(ESC"[0m", stdout);
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putcsi("0m");
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bb_putchar('\n');
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if (code > 1)
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if (code > EXIT_FAILURE)
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kill_myself_with_sig(code);
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exit(code);
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}
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@ -157,8 +170,8 @@ static void screen_read_close(void)
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G.size = i;
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G.data = xzalloc(2 * i);
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}
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else if (G.size != i) {
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cleanup(1);
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if (G.size != i) {
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cleanup(EXIT_FAILURE);
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}
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data = G.data + G.current;
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xread(vcsa_fd, data, G.size);
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@ -168,10 +181,15 @@ static void screen_read_close(void)
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unsigned x = j - G.x; // if will catch j < G.x too
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unsigned y = i - G.y; // if will catch i < G.y too
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if (CHAR(data) < ' ')
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CHAR(data) = ' ';
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if (y >= G.height || x >= G.width)
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DATA(data) = 0;
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else {
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uint8_t ch = CHAR(data);
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if (ch < ' ')
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CHAR(data) = ch | 0x40;
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else if (ch > 0x7e)
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CHAR(data) = '?';
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}
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}
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}
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}
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@ -179,10 +197,13 @@ static void screen_read_close(void)
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static void screen_char(char *data)
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{
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if (!BW) {
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uint8_t attr_diff;
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uint8_t attr = ATTR(data);
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//uint8_t attr = ATTR(data) >> 1; // for framebuffer console
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uint8_t attr_diff = G.last_attr ^ attr;
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if (option_mask32 & FLAG(F)) {
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attr >>= 1;
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}
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attr_diff = G.last_attr ^ attr;
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if (attr_diff) {
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// Attribute layout for VGA compatible text videobuffer:
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// blinking text
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@ -213,7 +234,7 @@ static void screen_char(char *data)
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const uint8_t bg_mask = 0x70, blink_mask = 0x80;
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char *ptr;
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ptr = G.attrbuf + 2; // skip "ESC ["
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ptr = G.attrbuf;
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// (G.last_attr & ~attr) has 1 only where
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// G.last_attr has 1 but attr has 0.
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@ -244,12 +265,12 @@ static void screen_char(char *data)
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if (attr_diff & bg_mask) {
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*ptr++ = '4';
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*ptr++ = color[(attr & bg_mask) >> 4];
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*ptr++ = ';';
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ptr++; // last attribute
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}
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if (ptr != G.attrbuf + 2) {
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if (ptr != G.attrbuf) {
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ptr[-1] = 'm';
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*ptr = '\0';
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fputs(G.attrbuf, stdout);
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putcsi(G.attrbuf);
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}
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}
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}
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@ -292,11 +313,11 @@ static void curmove(void)
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{
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unsigned cx = G.remote.cursor_x - G.x;
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unsigned cy = G.remote.cursor_y - G.y;
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int cursor = 1;
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int cursor = CURSOR_OFF;
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if (cx < G.width && cy < G.height) {
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gotoxy(cx, cy);
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cursor = -1;
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cursor = CURSOR_ON;
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}
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set_cursor(cursor);
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}
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@ -341,7 +362,7 @@ static NOINLINE void start_shell_in_child(const char* tty_name)
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int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int conspy_main(int argc UNUSED_PARAM, char **argv)
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{
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char tty_name[sizeof("/dev/ttyNN")];
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char tty_name[sizeof(DEV_TTY "NN")];
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#define keybuf bb_common_bufsiz1
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struct termios termbuf;
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unsigned opts;
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@ -351,26 +372,28 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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static const char getopt_longopts[] ALIGN1 =
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"viewonly\0" No_argument "v"
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"createdevice\0" No_argument "c"
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"neverquit\0" No_argument "Q"
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"session\0" No_argument "s"
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"nocolors\0" No_argument "n"
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"dump\0" No_argument "d"
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"follow\0" No_argument "f"
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"framebuffer\0" No_argument "F"
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;
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applet_long_options = getopt_longopts;
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#endif
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INIT_G();
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strcpy(G.vcsa_name, "/dev/vcsa");
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strcpy(G.vcsa_name, DEV_VCSA);
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opt_complementary = "x+:y+"; // numeric params
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opts = getopt32(argv, "vcsndfx:y:", &G.x, &G.y);
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opts = getopt32(argv, "vcQsndfFx:y:", &G.x, &G.y);
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argv += optind;
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ttynum = 0;
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if (argv[0]) {
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ttynum = xatou_range(argv[0], 0, 63);
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sprintf(G.vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
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sprintf(G.vcsa_name + sizeof(DEV_VCSA)-1, "%u", ttynum);
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}
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sprintf(tty_name, "%s%u", "/dev/tty", ttynum);
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sprintf(tty_name, "%s%u", DEV_TTY, ttynum);
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if (opts & FLAG(c)) {
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if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
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create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
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@ -481,7 +504,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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char *k;
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case -1:
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if (errno != EINTR)
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cleanup(1);
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goto abort;
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break;
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case 0:
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if (++G.nokeys >= 4)
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@ -492,14 +515,16 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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k = keybuf + G.key_count;
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bytes_read = read(G.kbd_fd, k, sizeof(keybuf) - G.key_count);
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if (bytes_read < 0)
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cleanup(1);
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goto abort;
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// Do exit processing
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if (!(option_mask32 & FLAG(Q))) {
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for (i = 0; i < bytes_read; i++) {
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if (k[i] != '\033')
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G.escape_count = 0;
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else if (++G.escape_count >= 3)
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cleanup(0);
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G.escape_count = -1;
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if (++G.escape_count >= 3)
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cleanup(EXIT_SUCCESS);
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}
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}
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}
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poll_timeout_ms = 250;
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@ -519,6 +544,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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if (result >= 0) {
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char *p = keybuf;
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G.ioerror_count = 0;
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if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE) {
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G.key_count = 0; // scan code mode
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}
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@ -534,16 +560,18 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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poll_timeout_ms = 20;
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}
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}
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// We sometimes get spurious IO errors on the TTY
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// as programs close and re-open it
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else if (errno != EIO || ++G.ioerror_count > 4) {
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if (ENABLE_FEATURE_CLEAN_UP)
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close(handle);
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goto abort;
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}
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// Close & re-open tty in case they have
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// swapped virtual consoles
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close(handle);
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// We sometimes get spurious IO errors on the TTY
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// as programs close and re-open it
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if (result >= 0)
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G.ioerror_count = 0;
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else if (errno != EIO || ++G.ioerror_count > 4)
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cleanup(1);
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}
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} /* while (1) */
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abort:
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cleanup(EXIT_FAILURE);
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}
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