conspy: significant output minimization; blink attribute support
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
31c3dad851
commit
1a3b0710f5
@ -8,10 +8,6 @@
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* http://ace-host.stuart.id.au/russell/files/conspy.c
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*
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* Licensed under GPLv2 or later, see file License in this tarball for details.
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*
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* example: conspy num shared access to console num
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* or conspy -d num screenshot of console num
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* or conspy -cs num poor man's GNU screen like
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*/
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//applet:IF_CONSPY(APPLET(conspy, _BB_DIR_BIN, _BB_SUID_DROP))
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@ -23,12 +19,12 @@
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//config: default n
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//config: help
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//config: A text-mode VNC like program for Linux virtual terminals.
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//config: example : conspy num shared access to console num
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//config: or conspy -d num screenshot of console num
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//config: or conspy -cs num poor man's GNU screen like
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//config: example: conspy NUM shared access to console num
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//config: or conspy -nd NUM screenshot of console num
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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 ROW] [-y LINE] [CONSOLE_NO]"
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//usage: "[-vcsndf] [-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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@ -40,14 +36,14 @@
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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 -x ROW Starting row"
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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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struct screen_info {
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unsigned char lines, rows, cursor_x, cursor_y;
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unsigned char lines, cols, cursor_x, cursor_y;
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};
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#define CHAR(x) ((uint8_t)((x)[0]))
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@ -62,20 +58,29 @@ struct globals {
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int kbd_fd;
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unsigned width;
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unsigned height;
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uint8_t last_attr;
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unsigned col;
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unsigned line;
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int ioerror_count;
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int key_count;
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int escape_count;
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int nokeys;
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int current;
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int vcsa_fd;
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struct screen_info info;
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uint16_t last_attr;
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uint8_t last_bold;
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uint8_t last_blink;
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uint8_t last_fg;
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uint8_t last_bg;
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char attrbuf[sizeof("\033[0;1;5;30;40m")];
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smallint curoff;
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struct screen_info remote;
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struct termios term_orig;
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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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strcpy((char*)&G.last_attr, "\xff\xff\xff\xff\xff\xff" "\033["); \
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} while (0)
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enum {
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@ -96,8 +101,8 @@ static void screen_read_close(void)
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xread(G.vcsa_fd, data, G.size);
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G.last_attr = 0;
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for (i = 0; i < G.info.lines; i++) {
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for (j = 0; j < G.info.rows; j++, NEXT(data)) {
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for (i = 0; i < G.remote.lines; i++) {
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for (j = 0; j < G.remote.cols; j++, NEXT(data)) {
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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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@ -140,51 +145,101 @@ static void screen_char(char *data)
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// text 8th bit
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// converting RGB color bit triad to BGR:
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static const char color[8] = "04261537";
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char *ptr;
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uint8_t fg, bold, bg, blink;
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G.last_attr = attr;
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printf("\033[%c;4%c;3%cm",
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(attr & 8) ? '1' : '0', // bold text / reset all
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color[(attr >> 4) & 7], // bkgd color
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color[attr & 7] // text color
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);
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//attr >>= 1; // for framebuffer console
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ptr = G.attrbuf + sizeof("\033[")-1;
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fg = (attr & 0x07);
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bold = (attr & 0x08);
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bg = (attr & 0x70);
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blink = (attr & 0x80);
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if (G.last_bold > bold || G.last_blink > blink) {
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G.last_bold = G.last_blink = 0;
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G.last_bg = 0xff;
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*ptr++ = '0';
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*ptr++ = ';';
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}
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if (G.last_bold != bold) {
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G.last_bold = bold;
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*ptr++ = '1';
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*ptr++ = ';';
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}
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if (G.last_blink != blink) {
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G.last_blink = blink;
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*ptr++ = '5';
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*ptr++ = ';';
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}
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if (G.last_fg != fg) {
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G.last_fg = fg;
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*ptr++ = '3';
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*ptr++ = color[fg];
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*ptr++ = ';';
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}
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if (G.last_bg != bg) {
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G.last_bg = bg;
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*ptr++ = '4';
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*ptr++ = color[bg >> 4];
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*ptr++ = ';';
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}
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if (ptr != G.attrbuf + sizeof("\033[")-1) {
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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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}
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}
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putchar(CHAR(data));
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G.col++;
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}
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static void clrscr(void)
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{
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printf("\033[1;1H" "\033[0J");
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// Home, clear till end of src, cursor on
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fputs("\033[1;1H" "\033[J" "\033[?25h", stdout);
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G.curoff = G.col = G.line = 0;
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}
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static void curoff(void)
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{
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printf("\033[?25l");
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if (!G.curoff) {
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G.curoff = 1;
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fputs("\033[?25l", stdout);
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}
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}
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static void curon(void)
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{
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printf("\033[?25h");
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if (G.curoff) {
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G.curoff = 0;
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fputs("\033[?25h", stdout);
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}
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}
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static void gotoxy(int row, int line)
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static void gotoxy(int col, int line)
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{
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printf("\033[%u;%uH", line + 1, row + 1);
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if (G.col != col || G.line != line) {
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G.col = col;
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G.line = line;
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printf("\033[%u;%uH", line + 1, col + 1);
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}
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}
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static void screen_dump(void)
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{
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int linefeed_cnt;
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int line, row;
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int linecnt = G.info.lines - G.y;
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char *data = G.data + G.current + (2 * G.y * G.info.rows);
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int line, col;
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int linecnt = G.remote.lines - G.y;
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char *data = G.data + G.current + (2 * G.y * G.remote.cols);
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linefeed_cnt = 0;
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for (line = 0; line < linecnt && line < G.height; line++) {
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int space_cnt = 0;
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for (row = 0; row < G.info.rows; row++, NEXT(data)) {
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unsigned tty_row = row - G.x; // if will catch row < G.x too
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for (col = 0; col < G.remote.cols; col++, NEXT(data)) {
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unsigned tty_col = col - G.x; // if will catch col < G.x too
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if (tty_row >= G.width)
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if (tty_col >= G.width)
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continue;
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space_cnt++;
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if (BW && CHAR(data) == ' ')
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@ -204,8 +259,8 @@ static void screen_dump(void)
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static void curmove(void)
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{
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unsigned cx = G.info.cursor_x - G.x;
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unsigned cy = G.info.cursor_y - G.y;
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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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if (cx >= G.width || cy >= G.height) {
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curoff();
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@ -226,7 +281,7 @@ static void cleanup(int code)
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}
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// Reset attributes
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if (!BW)
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printf("\033[0m");
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fputs("\033[0m", stdout);
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bb_putchar('\n');
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if (code > 1)
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kill_myself_with_sig(code); // does not return
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@ -236,8 +291,8 @@ static void cleanup(int code)
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static void get_initial_data(const char* vcsa_name)
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{
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G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
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xread(G.vcsa_fd, &G.info, 4);
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G.size = G.info.rows * G.info.lines * 2;
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xread(G.vcsa_fd, &G.remote, 4);
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G.size = G.remote.cols * G.remote.lines * 2;
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G.width = G.height = UINT_MAX;
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G.data = xzalloc(2 * G.size);
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screen_read_close();
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@ -354,34 +409,30 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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int i, j;
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char *data, *old;
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old = G.data + G.current;
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G.current = G.size - G.current;
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data = G.data + G.current;
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// Close & re-open vcsa in case they have
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// swapped virtual consoles
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G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
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xread(G.vcsa_fd, &G.info, 4);
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if (G.size != (G.info.rows * G.info.lines * 2)) {
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xread(G.vcsa_fd, &G.remote, 4);
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if (G.size != (G.remote.cols * G.remote.lines * 2)) {
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cleanup(1);
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}
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i = G.width;
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j = G.height;
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get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
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if ((option_mask32 & FLAG(f))) {
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int nx = G.info.cursor_x - G.width + 1;
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int ny = G.info.cursor_y - G.height + 1;
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int nx = G.remote.cursor_x - G.width + 1;
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int ny = G.remote.cursor_y - G.height + 1;
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if (G.info.cursor_x < G.x) {
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G.x = G.info.cursor_x;
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if (G.remote.cursor_x < G.x) {
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G.x = G.remote.cursor_x;
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i = 0; // force refresh
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}
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if (nx > G.x) {
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G.x = nx;
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i = 0; // force refresh
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}
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if (G.info.cursor_y < G.y) {
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G.y = G.info.cursor_y;
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if (G.remote.cursor_y < G.y) {
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G.y = G.remote.cursor_y;
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i = 0; // force refresh
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}
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if (ny > G.y) {
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@ -391,41 +442,44 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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}
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// Scan console data and redraw our tty where needed
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old = G.data + G.current;
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G.current = G.size - G.current;
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data = G.data + G.current;
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screen_read_close();
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if (i != G.width || j != G.height) {
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clrscr();
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screen_dump();
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}
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else for (i = 0; i < G.info.lines; i++) {
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char *last = last;
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char *first = NULL;
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int iy = i - G.y;
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} else {
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// For each remote line
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old += G.y * G.remote.cols * 2;
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data += G.y * G.remote.cols * 2;
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for (i = G.y; i < G.remote.lines; i++) {
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char *first = NULL; // first char which needs updating
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char *last = last; // last char which needs updating
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unsigned iy = i - G.y;
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if (iy >= (int) G.height)
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if (iy >= G.height)
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break;
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for (j = 0; j < G.info.rows; j++) {
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last = data;
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if (DATA(data) != DATA(old) && iy >= 0) {
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old += G.x * 2;
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data += G.x * 2;
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for (j = G.x; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
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unsigned jx = j - G.x;
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last = NULL;
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if (first == NULL && jx < G.width) {
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if (jx < G.width && DATA(data) != DATA(old)) {
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last = data;
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if (!first) {
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first = data;
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gotoxy(jx, iy);
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}
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}
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NEXT(old);
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NEXT(data);
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}
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if (first == NULL)
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continue;
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if (last == NULL)
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last = data;
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// Write the data to the screen
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for (; first < last; NEXT(first))
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if (first) {
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// Rewrite updated data on the local screen
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for (; first <= last; NEXT(first))
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screen_char(first);
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}
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}
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}
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curmove();
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// Wait for local user keypresses
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