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conspy: code shrink

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function                                             old     new   delta
conspy_main                                         1385    1380      -5
screen_dump                                          215     202     -13

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-06-25 00:57:57 +02:00
parent eff6d59343
commit 51fa147c9b
1 changed files with 28 additions and 21 deletions
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49
miscutils/conspy.c
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@ -9,9 +9,9 @@
* *
* Licensed under GPLv2 or later, see file License in this tarball for details. * Licensed under GPLv2 or later, see file License in this tarball for details.
* *
* example : conspy num shared access to console num * example: conspy num shared access to console num
* or conspy -d num screenshot of console num * or conspy -d num screenshot of console num
* or conspy -cs num poor man's GNU screen like * or conspy -cs num poor man's GNU screen like
*/ */
//applet:IF_CONSPY(APPLET(conspy, _BB_DIR_BIN, _BB_SUID_DROP)) //applet:IF_CONSPY(APPLET(conspy, _BB_DIR_BIN, _BB_SUID_DROP))
@ -28,7 +28,7 @@
//config: or conspy -cs num poor man's GNU screen like //config: or conspy -cs num poor man's GNU screen like
//usage:#define conspy_trivial_usage //usage:#define conspy_trivial_usage
//usage: "[-vcsndf] [-x ROW] [-y LINE] [CONSOLE_NO]" //usage: "[-vcsndf] [-x ROW] [-y LINE] [CONSOLE_NO]"
//usage:#define conspy_full_usage "\n\n" //usage:#define conspy_full_usage "\n\n"
//usage: "A text-mode VNC like program for Linux virtual consoles." //usage: "A text-mode VNC like program for Linux virtual consoles."
//usage: "\nTo exit, quickly press ESC 3 times." //usage: "\nTo exit, quickly press ESC 3 times."
@ -50,10 +50,10 @@ struct screen_info {
unsigned char lines, rows, cursor_x, cursor_y; unsigned char lines, rows, cursor_x, cursor_y;
}; };
#define CHAR(x) ((x)[0]) #define CHAR(x) ((uint8_t)((x)[0]))
#define ATTR(x) ((x)[1]) #define ATTR(x) ((uint8_t)((x)[1]))
#define NEXT(x) ((x)+=2) #define NEXT(x) ((x)+=2)
#define DATA(x) (* (short *) (x)) #define DATA(x) (*(uint16_t*)(x))
struct globals { struct globals {
char* data; char* data;
@ -102,7 +102,7 @@ static void screen_read_close(void)
unsigned y = i - G.y; // if will catch i < G.y too unsigned y = i - G.y; // if will catch i < G.y too
if (CHAR(data) < ' ') if (CHAR(data) < ' ')
CHAR(data) = ' '; *data = ' '; // CHAR(data) = ' ';
if (y >= G.height || x >= G.width) if (y >= G.height || x >= G.width)
DATA(data) = 0; DATA(data) = 0;
} }
@ -151,8 +151,15 @@ static void screen_char(char *data)
putchar(CHAR(data)); putchar(CHAR(data));
} }
#define clrscr() printf("\033[1;1H" "\033[0J") static void clrscr(void)
#define curoff() printf("\033[?25l") {
printf("\033[1;1H" "\033[0J");
}
static void curoff(void)
{
printf("\033[?25l");
}
static void curon(void) static void curon(void)
{ {
@ -180,10 +187,10 @@ static void screen_dump(void)
if (tty_row >= G.width) if (tty_row >= G.width)
continue; continue;
space_cnt++; space_cnt++;
if (BW && (CHAR(data) | ' ') == ' ') if (BW && CHAR(data) == ' ')
continue; continue;
while (linefeed_cnt != 0) { while (linefeed_cnt != 0) {
bb_putchar('\r'); //bb_putchar('\r'); - tty driver does it for us
bb_putchar('\n'); bb_putchar('\n');
linefeed_cnt--; linefeed_cnt--;
} }
@ -229,12 +236,11 @@ static void cleanup(int code)
static void get_initial_data(const char* vcsa_name) static void get_initial_data(const char* vcsa_name)
{ {
int size;
G.vcsa_fd = xopen(vcsa_name, O_RDONLY); G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
xread(G.vcsa_fd, &G.info, 4); xread(G.vcsa_fd, &G.info, 4);
G.size = size = G.info.rows * G.info.lines * 2; G.size = G.info.rows * G.info.lines * 2;
G.width = G.height = UINT_MAX; G.width = G.height = UINT_MAX;
G.data = xzalloc(2 * size); G.data = xzalloc(2 * G.size);
screen_read_close(); screen_read_close();
} }
@ -280,11 +286,11 @@ static NOINLINE void start_shell_in_child(const char* tty_name)
} }
} }
int conspy_main(int argc UNUSED_PARAM, char **argv) MAIN_EXTERNALLY_VISIBLE; int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int conspy_main(int argc UNUSED_PARAM, char **argv) int conspy_main(int argc UNUSED_PARAM, char **argv)
{ {
char vcsa_name[sizeof("/dev/vcsa") + 2]; char vcsa_name[sizeof("/dev/vcsaNN")];
char tty_name[sizeof("/dev/tty") + 2]; char tty_name[sizeof("/dev/ttyNN")];
#define keybuf bb_common_bufsiz1 #define keybuf bb_common_bufsiz1
struct termios termbuf; struct termios termbuf;
unsigned opts; unsigned opts;
@ -339,7 +345,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
tcgetattr(G.kbd_fd, &G.term_orig); tcgetattr(G.kbd_fd, &G.term_orig);
termbuf = G.term_orig; termbuf = G.term_orig;
termbuf.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL); termbuf.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
termbuf.c_oflag &= ~(OPOST); //termbuf.c_oflag &= ~(OPOST); - no, we still want \n -> \r\n
termbuf.c_lflag &= ~(ISIG|ICANON|ECHO); termbuf.c_lflag &= ~(ISIG|ICANON|ECHO);
termbuf.c_cc[VMIN] = 1; termbuf.c_cc[VMIN] = 1;
termbuf.c_cc[VTIME] = 0; termbuf.c_cc[VTIME] = 0;
@ -354,7 +360,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
old = G.data + G.current; old = G.data + G.current;
G.current = G.size - G.current; G.current = G.size - G.current;
data = G.data + G.current; data = G.data + G.current;
// Close & re-open vcsa in case they have // Close & re-open vcsa in case they have
// swapped virtual consoles // swapped virtual consoles
G.vcsa_fd = xopen(vcsa_name, O_RDONLY); G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
@ -448,7 +454,8 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
// Do exit processing // Do exit processing
for (i = 0; i < bytes_read; i++) { for (i = 0; i < bytes_read; i++) {
if (k[i] != '\033') G.escape_count = 0; if (k[i] != '\033')
G.escape_count = 0;
else if (++G.escape_count >= 3) else if (++G.escape_count >= 3)
cleanup(0); cleanup(0);
} }