* http://ace-host.stuart.id.au/russell/files/conspy.c
*
* Licensed under GPLv2 or later, see file License in this tarball for details.
- *
- * example: conspy num shared access to console num
- * or conspy -d num screenshot of console num
- * or conspy -cs num poor man's GNU screen like
*/
//applet:IF_CONSPY(APPLET(conspy, _BB_DIR_BIN, _BB_SUID_DROP))
//config: default n
//config: help
//config: A text-mode VNC like program for Linux virtual terminals.
-//config: example : conspy num shared access to console num
-//config: or conspy -d num screenshot of console num
-//config: or conspy -cs num poor man's GNU screen like
+//config: example: conspy NUM shared access to console num
+//config: or conspy -nd NUM screenshot of console num
+//config: or conspy -cs NUM poor man's GNU screen like
//usage:#define conspy_trivial_usage
-//usage: "[-vcsndf] [-x ROW] [-y LINE] [CONSOLE_NO]"
+//usage: "[-vcsndf] [-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 -n Black & white"
//usage: "\n -d Dump console to stdout"
//usage: "\n -f Follow cursor"
-//usage: "\n -x ROW Starting row"
+//usage: "\n -x COL Starting column"
//usage: "\n -y LINE Starting line"
#include "libbb.h"
#include <sys/kd.h>
struct screen_info {
- unsigned char lines, rows, cursor_x, cursor_y;
+ unsigned char lines, cols, cursor_x, cursor_y;
};
#define CHAR(x) ((uint8_t)((x)[0]))
int kbd_fd;
unsigned width;
unsigned height;
- uint8_t last_attr;
+ unsigned col;
+ unsigned line;
int ioerror_count;
int key_count;
int escape_count;
int nokeys;
int current;
int vcsa_fd;
- struct screen_info info;
+ uint16_t last_attr;
+ uint8_t last_bold;
+ uint8_t last_blink;
+ uint8_t last_fg;
+ uint8_t last_bg;
+ char attrbuf[sizeof("\033[0;1;5;30;40m")];
+ smallint curoff;
+ struct screen_info remote;
struct termios term_orig;
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+ strcpy((char*)&G.last_attr, "\xff\xff\xff\xff\xff\xff" "\033["); \
} while (0)
enum {
xread(G.vcsa_fd, data, G.size);
G.last_attr = 0;
- for (i = 0; i < G.info.lines; i++) {
- for (j = 0; j < G.info.rows; j++, NEXT(data)) {
+ for (i = 0; i < G.remote.lines; i++) {
+ for (j = 0; j < G.remote.cols; j++, NEXT(data)) {
unsigned x = j - G.x; // if will catch j < G.x too
unsigned y = i - G.y; // if will catch i < G.y too
// text 8th bit
// converting RGB color bit triad to BGR:
static const char color[8] = "04261537";
+ char *ptr;
+ uint8_t fg, bold, bg, blink;
G.last_attr = attr;
- printf("\033[%c;4%c;3%cm",
- (attr & 8) ? '1' : '0', // bold text / reset all
- color[(attr >> 4) & 7], // bkgd color
- color[attr & 7] // text color
- );
+
+ //attr >>= 1; // for framebuffer console
+ ptr = G.attrbuf + sizeof("\033[")-1;
+ fg = (attr & 0x07);
+ bold = (attr & 0x08);
+ bg = (attr & 0x70);
+ blink = (attr & 0x80);
+ if (G.last_bold > bold || G.last_blink > blink) {
+ G.last_bold = G.last_blink = 0;
+ G.last_bg = 0xff;
+ *ptr++ = '0';
+ *ptr++ = ';';
+ }
+ if (G.last_bold != bold) {
+ G.last_bold = bold;
+ *ptr++ = '1';
+ *ptr++ = ';';
+ }
+ if (G.last_blink != blink) {
+ G.last_blink = blink;
+ *ptr++ = '5';
+ *ptr++ = ';';
+ }
+ if (G.last_fg != fg) {
+ G.last_fg = fg;
+ *ptr++ = '3';
+ *ptr++ = color[fg];
+ *ptr++ = ';';
+ }
+ if (G.last_bg != bg) {
+ G.last_bg = bg;
+ *ptr++ = '4';
+ *ptr++ = color[bg >> 4];
+ *ptr++ = ';';
+ }
+ if (ptr != G.attrbuf + sizeof("\033[")-1) {
+ ptr[-1] = 'm';
+ *ptr = '\0';
+ fputs(G.attrbuf, stdout);
+ }
}
putchar(CHAR(data));
+ G.col++;
}
static void clrscr(void)
{
- printf("\033[1;1H" "\033[0J");
+ // Home, clear till end of src, cursor on
+ fputs("\033[1;1H" "\033[J" "\033[?25h", stdout);
+ G.curoff = G.col = G.line = 0;
}
static void curoff(void)
{
- printf("\033[?25l");
+ if (!G.curoff) {
+ G.curoff = 1;
+ fputs("\033[?25l", stdout);
+ }
}
static void curon(void)
{
- printf("\033[?25h");
+ if (G.curoff) {
+ G.curoff = 0;
+ fputs("\033[?25h", stdout);
+ }
}
-static void gotoxy(int row, int line)
+static void gotoxy(int col, int line)
{
- printf("\033[%u;%uH", line + 1, row + 1);
+ if (G.col != col || G.line != line) {
+ G.col = col;
+ G.line = line;
+ printf("\033[%u;%uH", line + 1, col + 1);
+ }
}
static void screen_dump(void)
{
int linefeed_cnt;
- int line, row;
- int linecnt = G.info.lines - G.y;
- char *data = G.data + G.current + (2 * G.y * G.info.rows);
+ int line, col;
+ int linecnt = G.remote.lines - G.y;
+ char *data = G.data + G.current + (2 * G.y * G.remote.cols);
linefeed_cnt = 0;
for (line = 0; line < linecnt && line < G.height; line++) {
int space_cnt = 0;
- for (row = 0; row < G.info.rows; row++, NEXT(data)) {
- unsigned tty_row = row - G.x; // if will catch row < G.x too
+ for (col = 0; col < G.remote.cols; col++, NEXT(data)) {
+ unsigned tty_col = col - G.x; // if will catch col < G.x too
- if (tty_row >= G.width)
+ if (tty_col >= G.width)
continue;
space_cnt++;
if (BW && CHAR(data) == ' ')
static void curmove(void)
{
- unsigned cx = G.info.cursor_x - G.x;
- unsigned cy = G.info.cursor_y - G.y;
+ unsigned cx = G.remote.cursor_x - G.x;
+ unsigned cy = G.remote.cursor_y - G.y;
if (cx >= G.width || cy >= G.height) {
curoff();
}
// Reset attributes
if (!BW)
- printf("\033[0m");
+ fputs("\033[0m", stdout);
bb_putchar('\n');
if (code > 1)
kill_myself_with_sig(code); // does not return
static void get_initial_data(const char* vcsa_name)
{
G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
- xread(G.vcsa_fd, &G.info, 4);
- G.size = G.info.rows * G.info.lines * 2;
+ xread(G.vcsa_fd, &G.remote, 4);
+ G.size = G.remote.cols * G.remote.lines * 2;
G.width = G.height = UINT_MAX;
G.data = xzalloc(2 * G.size);
screen_read_close();
int i, j;
char *data, *old;
- old = G.data + G.current;
- G.current = G.size - G.current;
- data = G.data + G.current;
-
// Close & re-open vcsa in case they have
// swapped virtual consoles
G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
- xread(G.vcsa_fd, &G.info, 4);
- if (G.size != (G.info.rows * G.info.lines * 2)) {
+ xread(G.vcsa_fd, &G.remote, 4);
+ if (G.size != (G.remote.cols * G.remote.lines * 2)) {
cleanup(1);
}
i = G.width;
j = G.height;
get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
if ((option_mask32 & FLAG(f))) {
- int nx = G.info.cursor_x - G.width + 1;
- int ny = G.info.cursor_y - G.height + 1;
+ int nx = G.remote.cursor_x - G.width + 1;
+ int ny = G.remote.cursor_y - G.height + 1;
- if (G.info.cursor_x < G.x) {
- G.x = G.info.cursor_x;
+ if (G.remote.cursor_x < G.x) {
+ G.x = G.remote.cursor_x;
i = 0; // force refresh
}
if (nx > G.x) {
G.x = nx;
i = 0; // force refresh
}
- if (G.info.cursor_y < G.y) {
- G.y = G.info.cursor_y;
+ if (G.remote.cursor_y < G.y) {
+ G.y = G.remote.cursor_y;
i = 0; // force refresh
}
if (ny > G.y) {
}
// Scan console data and redraw our tty where needed
+ old = G.data + G.current;
+ G.current = G.size - G.current;
+ data = G.data + G.current;
screen_read_close();
if (i != G.width || j != G.height) {
clrscr();
screen_dump();
- }
- else for (i = 0; i < G.info.lines; i++) {
- char *last = last;
- char *first = NULL;
- int iy = i - G.y;
-
- if (iy >= (int) G.height)
- break;
- for (j = 0; j < G.info.rows; j++) {
- last = data;
- if (DATA(data) != DATA(old) && iy >= 0) {
+ } else {
+ // For each remote line
+ old += G.y * G.remote.cols * 2;
+ data += G.y * G.remote.cols * 2;
+ for (i = G.y; i < G.remote.lines; i++) {
+ char *first = NULL; // first char which needs updating
+ char *last = last; // last char which needs updating
+ unsigned iy = i - G.y;
+
+ if (iy >= G.height)
+ break;
+ old += G.x * 2;
+ data += G.x * 2;
+ for (j = G.x; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
unsigned jx = j - G.x;
- last = NULL;
- if (first == NULL && jx < G.width) {
- first = data;
- gotoxy(jx, iy);
+ if (jx < G.width && DATA(data) != DATA(old)) {
+ last = data;
+ if (!first) {
+ first = data;
+ gotoxy(jx, iy);
+ }
}
}
- NEXT(old);
- NEXT(data);
+ if (first) {
+ // Rewrite updated data on the local screen
+ for (; first <= last; NEXT(first))
+ screen_char(first);
+ }
}
- if (first == NULL)
- continue;
- if (last == NULL)
- last = data;
-
- // Write the data to the screen
- for (; first < last; NEXT(first))
- screen_char(first);
}
curmove();
projects / oweals / busybox.git / commitdiff