diff options
| -rw-r--r-- | miscutils/conspy.c | 114 |
1 files changed, 71 insertions, 43 deletions
diff --git a/miscutils/conspy.c b/miscutils/conspy.c index c6ed91832..1a46a4340 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); } |