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-rw-r--r--miscutils/conspy.c114
1 files changed, 71 insertions, 43 deletions
diff --git a/miscutils/conspy.c b/miscutils/conspy.c
index c6ed918..1a46a43 100644
--- a/miscutils/conspy.c
+++ b/miscutils/conspy.c
@@ -25,25 +25,31 @@
//config: or conspy -cs NUM poor man's GNU screen like
//usage:#define conspy_trivial_usage
-//usage: "[-vcsndf] [-x COL] [-y LINE] [CONSOLE_NO]"
+//usage: "[-vcsndfFQ] [-x COL] [-y LINE] [CONSOLE_NO]"
//usage:#define conspy_full_usage "\n\n"
//usage: "A text-mode VNC like program for Linux virtual consoles."
//usage: "\nTo exit, quickly press ESC 3 times."
//usage: "\n"
//usage: "\n -v Don't send keystrokes to the console"
-//usage: "\n -c Create missing devices in /dev"
+//usage: "\n -c Create missing /dev/{tty,vcsa}N"
//usage: "\n -s Open a SHELL session"
//usage: "\n -n Black & white"
//usage: "\n -d Dump console to stdout"
//usage: "\n -f Follow cursor"
+//usage: "\n -F Assume console is on a framebuffer device"
+//usage: "\n -Q Disable exit on ESC-ESC-ESC"
//usage: "\n -x COL Starting column"
//usage: "\n -y LINE Starting line"
#include "libbb.h"
#include <sys/kd.h>
-
#define ESC "\033"
+#define CURSOR_ON -1
+#define CURSOR_OFF 1
+
+#define DEV_TTY "/dev/tty"
+#define DEV_VCSA "/dev/vcsa"
struct screen_info {
unsigned char lines, cols, cursor_x, cursor_y;
@@ -72,19 +78,17 @@ struct globals {
unsigned col;
unsigned line;
smallint curoff; // unknown:0 cursor on:-1 cursor off:1
- char attrbuf[sizeof(ESC"[0;1;5;30;40m")];
+ char attrbuf[sizeof("0;1;5;30;40m")];
// remote console
struct screen_info remote;
// saved local tty terminfo
struct termios term_orig;
- char vcsa_name[sizeof("/dev/vcsaNN")];
+ char vcsa_name[sizeof(DEV_VCSA "NN")];
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
- G.attrbuf[0] = '\033'; \
- G.attrbuf[1] = '['; \
G.width = G.height = UINT_MAX; \
G.last_attr--; \
} while (0)
@@ -92,18 +96,26 @@ struct globals {
enum {
FLAG_v, // view only
FLAG_c, // create device if need
+ FLAG_Q, // never exit
FLAG_s, // session
FLAG_n, // no colors
FLAG_d, // dump screen
FLAG_f, // follow cursor
+ FLAG_F, // framebuffer
};
#define FLAG(x) (1 << FLAG_##x)
#define BW (option_mask32 & FLAG(n))
+static void putcsi(const char *s)
+{
+ fputs(ESC"[", stdout);
+ fputs(s, stdout);
+}
+
static void clrscr(void)
{
// Home, clear till end of screen
- fputs(ESC"[1;1H" ESC"[J", stdout);
+ putcsi("1;1H" ESC"[J");
G.col = G.line = 0;
}
@@ -111,7 +123,7 @@ static void set_cursor(int state)
{
if (G.curoff != state) {
G.curoff = state;
- fputs(ESC"[?25", stdout);
+ putcsi("?25");
bb_putchar("h?l"[1 + state]);
}
}
@@ -125,18 +137,19 @@ static void gotoxy(int col, int line)
}
}
+static void cleanup(int code) NORETURN;
static void cleanup(int code)
{
- set_cursor(-1); // cursor on
+ set_cursor(CURSOR_ON);
tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
if (ENABLE_FEATURE_CLEAN_UP) {
close(G.kbd_fd);
}
// Reset attributes
if (!BW)
- fputs(ESC"[0m", stdout);
+ putcsi("0m");
bb_putchar('\n');
- if (code > 1)
+ if (code > EXIT_FAILURE)
kill_myself_with_sig(code);
exit(code);
}
@@ -157,8 +170,8 @@ static void screen_read_close(void)
G.size = i;
G.data = xzalloc(2 * i);
}
- else if (G.size != i) {
- cleanup(1);
+ if (G.size != i) {
+ cleanup(EXIT_FAILURE);
}
data = G.data + G.current;
xread(vcsa_fd, data, G.size);
@@ -168,10 +181,15 @@ static void screen_read_close(void)
unsigned x = j - G.x; // if will catch j < G.x too
unsigned y = i - G.y; // if will catch i < G.y too
- if (CHAR(data) < ' ')
- CHAR(data) = ' ';
if (y >= G.height || x >= G.width)
DATA(data) = 0;
+ else {
+ uint8_t ch = CHAR(data);
+ if (ch < ' ')
+ CHAR(data) = ch | 0x40;
+ else if (ch > 0x7e)
+ CHAR(data) = '?';
+ }
}
}
}
@@ -179,10 +197,13 @@ static void screen_read_close(void)
static void screen_char(char *data)
{
if (!BW) {
+ uint8_t attr_diff;
uint8_t attr = ATTR(data);
- //uint8_t attr = ATTR(data) >> 1; // for framebuffer console
- uint8_t attr_diff = G.last_attr ^ attr;
+ if (option_mask32 & FLAG(F)) {
+ attr >>= 1;
+ }
+ attr_diff = G.last_attr ^ attr;
if (attr_diff) {
// Attribute layout for VGA compatible text videobuffer:
// blinking text
@@ -213,7 +234,7 @@ static void screen_char(char *data)
const uint8_t bg_mask = 0x70, blink_mask = 0x80;
char *ptr;
- ptr = G.attrbuf + 2; // skip "ESC ["
+ ptr = G.attrbuf;
// (G.last_attr & ~attr) has 1 only where
// G.last_attr has 1 but attr has 0.
@@ -244,12 +265,12 @@ static void screen_char(char *data)
if (attr_diff & bg_mask) {
*ptr++ = '4';
*ptr++ = color[(attr & bg_mask) >> 4];
- *ptr++ = ';';
+ ptr++; // last attribute
}
- if (ptr != G.attrbuf + 2) {
+ if (ptr != G.attrbuf) {
ptr[-1] = 'm';
*ptr = '\0';
- fputs(G.attrbuf, stdout);
+ putcsi(G.attrbuf);
}
}
}
@@ -292,11 +313,11 @@ static void curmove(void)
{
unsigned cx = G.remote.cursor_x - G.x;
unsigned cy = G.remote.cursor_y - G.y;
- int cursor = 1;
+ int cursor = CURSOR_OFF;
if (cx < G.width && cy < G.height) {
gotoxy(cx, cy);
- cursor = -1;
+ cursor = CURSOR_ON;
}
set_cursor(cursor);
}
@@ -341,7 +362,7 @@ static NOINLINE void start_shell_in_child(const char* tty_name)
int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int conspy_main(int argc UNUSED_PARAM, char **argv)
{
- char tty_name[sizeof("/dev/ttyNN")];
+ char tty_name[sizeof(DEV_TTY "NN")];
#define keybuf bb_common_bufsiz1
struct termios termbuf;
unsigned opts;
@@ -351,26 +372,28 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
static const char getopt_longopts[] ALIGN1 =
"viewonly\0" No_argument "v"
"createdevice\0" No_argument "c"
+ "neverquit\0" No_argument "Q"
"session\0" No_argument "s"
"nocolors\0" No_argument "n"
"dump\0" No_argument "d"
"follow\0" No_argument "f"
+ "framebuffer\0" No_argument "F"
;
applet_long_options = getopt_longopts;
#endif
INIT_G();
- strcpy(G.vcsa_name, "/dev/vcsa");
+ strcpy(G.vcsa_name, DEV_VCSA);
opt_complementary = "x+:y+"; // numeric params
- opts = getopt32(argv, "vcsndfx:y:", &G.x, &G.y);
+ opts = getopt32(argv, "vcQsndfFx:y:", &G.x, &G.y);
argv += optind;
ttynum = 0;
if (argv[0]) {
ttynum = xatou_range(argv[0], 0, 63);
- sprintf(G.vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
+ sprintf(G.vcsa_name + sizeof(DEV_VCSA)-1, "%u", ttynum);
}
- sprintf(tty_name, "%s%u", "/dev/tty", ttynum);
+ sprintf(tty_name, "%s%u", DEV_TTY, ttynum);
if (opts & FLAG(c)) {
if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
@@ -481,7 +504,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
char *k;
case -1:
if (errno != EINTR)
- cleanup(1);
+ goto abort;
break;
case 0:
if (++G.nokeys >= 4)
@@ -492,14 +515,16 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
k = keybuf + G.key_count;
bytes_read = read(G.kbd_fd, k, sizeof(keybuf) - G.key_count);
if (bytes_read < 0)
- cleanup(1);
+ goto abort;
// Do exit processing
- for (i = 0; i < bytes_read; i++) {
- if (k[i] != '\033')
- G.escape_count = 0;
- else if (++G.escape_count >= 3)
- cleanup(0);
+ if (!(option_mask32 & FLAG(Q))) {
+ for (i = 0; i < bytes_read; i++) {
+ if (k[i] != '\033')
+ G.escape_count = -1;
+ if (++G.escape_count >= 3)
+ cleanup(EXIT_SUCCESS);
+ }
}
}
poll_timeout_ms = 250;
@@ -519,6 +544,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
if (result >= 0) {
char *p = keybuf;
+ G.ioerror_count = 0;
if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE) {
G.key_count = 0; // scan code mode
}
@@ -534,16 +560,18 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
poll_timeout_ms = 20;
}
}
+ // We sometimes get spurious IO errors on the TTY
+ // as programs close and re-open it
+ else if (errno != EIO || ++G.ioerror_count > 4) {
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(handle);
+ goto abort;
+ }
// Close & re-open tty in case they have
// swapped virtual consoles
close(handle);
-
- // We sometimes get spurious IO errors on the TTY
- // as programs close and re-open it
- if (result >= 0)
- G.ioerror_count = 0;
- else if (errno != EIO || ++G.ioerror_count > 4)
- cleanup(1);
}
} /* while (1) */
+ abort:
+ cleanup(EXIT_FAILURE);
}
generated by cgit v1.1 at 2024-12-30 23:36:45 +0000