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authorPascal Bellard <pascal.bellard@ads-lu.com>2010-06-30 05:05:31 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2010-06-30 05:05:31 (GMT)
commitfa5ea17b5f6457d888a30afeff87420b7fe0348a (patch)
treeab8580e0a8f5d9162fd54ca92529187ee97b6820
parentc03fb3cd7d6b41706a4ade372c5df9c6b951a51c (diff)
downloadbusybox-fa5ea17b5f6457d888a30afeff87420b7fe0348a.tar.gz
busybox-fa5ea17b5f6457d888a30afeff87420b7fe0348a.tar.bz2
conspy: code shrink
function old new delta screen_read_close 114 187 +73 set_cursor - 53 +53 cleanup 93 91 -2 screen_dump 202 197 -5 curon 34 - -34 screen_char 351 308 -43 conspy_main 1444 1264 -180 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 1/4 up/down: 126/-264) Total: -138 bytes Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--miscutils/conspy.c211
1 files changed, 101 insertions, 110 deletions
diff --git a/miscutils/conspy.c b/miscutils/conspy.c
index 6f2f025..565922c 100644
--- a/miscutils/conspy.c
+++ b/miscutils/conspy.c
@@ -46,9 +46,9 @@ struct screen_info {
unsigned char lines, cols, cursor_x, cursor_y;
};
-#define CHAR(x) ((uint8_t)((x)[0]))
-#define ATTR(x) ((uint8_t)((x)[1]))
-#define NEXT(x) ((x)+=2)
+#define CHAR(x) (*(uint8_t*)(x))
+#define ATTR(x) (((uint8_t*)(x))[1])
+#define NEXT(x) ((x) += 2)
#define DATA(x) (*(uint16_t*)(x))
struct globals {
@@ -56,25 +56,25 @@ struct globals {
int size;
int x, y;
int kbd_fd;
- int vcsa_fd;
int ioerror_count;
int key_count;
int escape_count;
int nokeys;
int current;
+ int first_line_offset;
+ int last_attr;
// cached local tty parameters
unsigned width;
unsigned height;
unsigned col;
unsigned line;
- smallint curoff;
- uint8_t last_attr;
- uint8_t force_attr_change;
+ smallint curoff; // unknown:0 cursor on:-1 cursor off:1
char attrbuf[sizeof("\033[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")];
};
#define G (*ptr_to_globals)
@@ -82,7 +82,8 @@ struct globals {
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
G.attrbuf[0] = '\033'; \
G.attrbuf[1] = '['; \
- G.force_attr_change = 0xff; \
+ G.width = G.height = UINT_MAX; \
+ G.last_attr--; \
} while (0)
enum {
@@ -96,24 +97,80 @@ enum {
#define FLAG(x) (1 << FLAG_##x)
#define BW (option_mask32 & FLAG(n))
+static void clrscr(void)
+{
+ // Home, clear till end of screen
+ fputs("\033[1;1H" "\033[J", stdout);
+ G.col = G.line = 0;
+}
+
+static void set_cursor(int state)
+{
+ if (G.curoff != state) {
+ G.curoff = state;
+ fputs("\033[?25", stdout);
+ bb_putchar("h?l"[1 + state]);
+ }
+}
+
+static void gotoxy(int col, int line)
+{
+ if (G.col != col || G.line != line) {
+ G.col = col;
+ G.line = line;
+ printf("\033[%u;%uH", line + 1, col + 1);
+ }
+}
+
+static void cleanup(int code)
+{
+ set_cursor(-1); // cursor on
+ tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ close(G.kbd_fd);
+ }
+ // Reset attributes
+ if (!BW)
+ fputs("\033[0m", stdout);
+ bb_putchar('\n');
+ if (code > 1)
+ kill_myself_with_sig(code);
+ exit(code);
+}
+
static void screen_read_close(void)
{
unsigned i, j;
- char *data = G.data + G.current;
-
- xread(G.vcsa_fd, data, G.size);
+ int vcsa_fd;
+ char *data;
+
+ // Close & re-open vcsa in case they have swapped virtual consoles
+ vcsa_fd = xopen(G.vcsa_name, O_RDONLY);
+ xread(vcsa_fd, &G.remote, 4);
+ i = G.remote.cols * 2;
+ G.first_line_offset = G.y * i;
+ i *= G.remote.lines;
+ if (G.data == NULL) {
+ G.size = i;
+ G.data = xzalloc(2 * i);
+ }
+ else if (G.size != i) {
+ cleanup(1);
+ }
+ data = G.data + G.current;
+ xread(vcsa_fd, data, G.size);
+ close(vcsa_fd);
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
if (CHAR(data) < ' ')
- *data = ' '; // CHAR(data) = ' ';
+ CHAR(data) = ' ';
if (y >= G.height || x >= G.width)
DATA(data) = 0;
}
}
- close(G.vcsa_fd);
}
static void screen_char(char *data)
@@ -121,7 +178,7 @@ static void screen_char(char *data)
if (!BW) {
uint8_t attr = ATTR(data);
//uint8_t attr = ATTR(data) >> 1; // for framebuffer console
- uint8_t attr_diff = (G.last_attr ^ attr) | G.force_attr_change;
+ uint8_t attr_diff = G.last_attr ^ attr;
if (attr_diff) {
// Attribute layout for VGA compatible text videobuffer:
@@ -153,19 +210,20 @@ 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 + 2; // skip "ESC ["
// (G.last_attr & ~attr) has 1 only where
// G.last_attr has 1 but attr has 0.
// Here we check whether we have transition
// bold->non-bold or blink->non-blink:
- if ((G.last_attr & ~attr) & (bold_mask | blink_mask)) {
+ if (G.last_attr < 0 // initial value
+ || ((G.last_attr & ~attr) & (bold_mask | blink_mask)) != 0
+ ) {
*ptr++ = '0'; // "reset all attrs"
*ptr++ = ';';
// must set fg & bg, maybe need to set bold or blink:
attr_diff = attr | ~(bold_mask | blink_mask);
}
- G.force_attr_change = 0;
G.last_attr = attr;
if (attr_diff & bold_mask) {
*ptr++ = '1';
@@ -196,44 +254,12 @@ static void screen_char(char *data)
G.col++;
}
-static void clrscr(void)
-{
- // 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)
-{
- if (!G.curoff) {
- G.curoff = 1;
- fputs("\033[?25l", stdout);
- }
-}
-
-static void curon(void)
-{
- if (G.curoff) {
- G.curoff = 0;
- fputs("\033[?25h", stdout);
- }
-}
-
-static void gotoxy(int col, int line)
-{
- 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, col;
int linecnt = G.remote.lines - G.y;
- char *data = G.data + G.current + (2 * G.y * G.remote.cols);
+ char *data = G.data + G.current + G.first_line_offset;
linefeed_cnt = 0;
for (line = 0; line < linecnt && line < G.height; line++) {
@@ -263,41 +289,13 @@ static void curmove(void)
{
unsigned cx = G.remote.cursor_x - G.x;
unsigned cy = G.remote.cursor_y - G.y;
+ int cursor = 1;
- if (cx >= G.width || cy >= G.height) {
- curoff();
- } else {
- curon();
+ if (cx < G.width && cy < G.height) {
gotoxy(cx, cy);
+ cursor = -1;
}
- fflush_all();
-}
-
-static void cleanup(int code)
-{
- curon();
- fflush_all();
- tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
- if (ENABLE_FEATURE_CLEAN_UP) {
- close(G.kbd_fd);
- }
- // Reset attributes
- if (!BW)
- fputs("\033[0m", stdout);
- bb_putchar('\n');
- if (code > 1)
- kill_myself_with_sig(code); // does not return
- exit(code);
-}
-
-static void get_initial_data(const char* vcsa_name)
-{
- G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
- 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();
+ set_cursor(cursor);
}
static void create_cdev_if_doesnt_exist(const char* name, dev_t dev)
@@ -345,7 +343,6 @@ 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 vcsa_name[sizeof("/dev/vcsaNN")];
char tty_name[sizeof("/dev/ttyNN")];
#define keybuf bb_common_bufsiz1
struct termios termbuf;
@@ -365,7 +362,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
applet_long_options = getopt_longopts;
#endif
INIT_G();
- strcpy(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);
@@ -373,19 +370,19 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
ttynum = 0;
if (argv[0]) {
ttynum = xatou_range(argv[0], 0, 63);
- sprintf(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);
if (opts & FLAG(c)) {
if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
- create_cdev_if_doesnt_exist(vcsa_name, makedev(7, 128 + ttynum));
+ create_cdev_if_doesnt_exist(G.vcsa_name, makedev(7, 128 + ttynum));
}
if ((opts & FLAG(s)) && ttynum) {
start_shell_in_child(tty_name);
}
- get_initial_data(vcsa_name);
+ screen_read_close();
if (opts & FLAG(d)) {
screen_dump();
bb_putchar('\n');
@@ -412,17 +409,11 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
int i, j;
char *data, *old;
- // Close & re-open vcsa in case they have
- // swapped virtual consoles
- G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
- xread(G.vcsa_fd, &G.remote, 4);
- if (G.size != (G.remote.cols * G.remote.lines * 2)) {
- cleanup(1);
- }
+ // in the first loop G.width = G.height = 0: refresh
i = G.width;
j = G.height;
get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
- if ((option_mask32 & FLAG(f))) {
+ if (option_mask32 & FLAG(f)) {
int nx = G.remote.cursor_x - G.width + 1;
int ny = G.remote.cursor_y - G.height + 1;
@@ -454,8 +445,8 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
screen_dump();
} else {
// For each remote line
- old += G.y * G.remote.cols * 2;
- data += G.y * G.remote.cols * 2;
+ old += G.first_line_offset;
+ data += G.first_line_offset;
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
@@ -463,10 +454,8 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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;
+ for (j = 0; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
+ unsigned jx = j - G.x; // if will catch j >= G.x too
if (jx < G.width && DATA(data) != DATA(old)) {
last = data;
@@ -486,6 +475,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
curmove();
// Wait for local user keypresses
+ fflush_all();
pfd.fd = G.kbd_fd;
pfd.events = POLLIN;
bytes_read = 0;
@@ -532,15 +522,16 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
else if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE)
G.key_count = 0; // scan code mode
else {
- for (i = 0; i < G.key_count && result != -1; i++)
- result = ioctl(handle, TIOCSTI, keybuf + i);
- G.key_count -= i;
+ char *p = keybuf;
+ for (; G.key_count != 0 && result != -1; p++, G.key_count--) {
+ result = ioctl(handle, TIOCSTI, p);
+ // If there is an application on console which reacts
+ // to keypresses, we need to make our first sleep
+ // shorter to quickly redraw whatever it printed there.
+ poll_timeout_ms = 20;
+ }
if (G.key_count)
- memmove(keybuf, keybuf + i, G.key_count);
- // If there is an application on console which reacts
- // to keypresses, we need to make our first sleep
- // shorter to quickly redraw whatever it printed there.
- poll_timeout_ms = 20;
+ memmove(keybuf, p, G.key_count);
}
// Close & re-open tty in case they have
// swapped virtual consoles
@@ -553,5 +544,5 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
else if (errno != EIO || ++G.ioerror_count > 4)
cleanup(1);
}
- }
+ } /* while (1) */
}