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>
This commit is contained in:
Pascal Bellard
Denys Vlasenko
parent
c03fb3cd7d
commit
fa5ea17b5f
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@ -46,9 +46,9 @@ struct screen_info {
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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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#define ATTR(x) ((uint8_t)((x)[1]))
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#define NEXT(x) ((x)+=2)
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#define CHAR(x) (*(uint8_t*)(x))
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#define ATTR(x) (((uint8_t*)(x))[1])
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#define NEXT(x) ((x) += 2)
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#define DATA(x) (*(uint16_t*)(x))
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struct globals {
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@ -56,25 +56,25 @@ struct globals {
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int size;
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int x, y;
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int kbd_fd;
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int vcsa_fd;
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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 first_line_offset;
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int last_attr;
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// cached local tty parameters
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unsigned width;
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unsigned height;
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unsigned col;
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unsigned line;
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smallint curoff;
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uint8_t last_attr;
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uint8_t force_attr_change;
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smallint curoff; // unknown:0 cursor on:-1 cursor off:1
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char attrbuf[sizeof("\033[0;1;5;30;40m")];
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// remote console
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struct screen_info remote;
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// saved local tty terminfo
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struct termios term_orig;
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char vcsa_name[sizeof("/dev/vcsaNN")];
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};
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#define G (*ptr_to_globals)
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@ -82,7 +82,8 @@ struct globals {
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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G.attrbuf[0] = '\033'; \
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G.attrbuf[1] = '['; \
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G.force_attr_change = 0xff; \
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G.width = G.height = UINT_MAX; \
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G.last_attr--; \
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} while (0)
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enum {
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@ -96,24 +97,80 @@ enum {
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#define FLAG(x) (1 << FLAG_##x)
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#define BW (option_mask32 & FLAG(n))
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static void clrscr(void)
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{
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// Home, clear till end of screen
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fputs("\033[1;1H" "\033[J", stdout);
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G.col = G.line = 0;
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}
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static void set_cursor(int state)
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{
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if (G.curoff != state) {
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G.curoff = state;
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fputs("\033[?25", stdout);
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bb_putchar("h?l"[1 + state]);
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}
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}
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static void gotoxy(int col, int line)
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{
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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 cleanup(int code)
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{
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set_cursor(-1); // cursor on
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tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(G.kbd_fd);
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}
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// Reset attributes
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if (!BW)
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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);
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exit(code);
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}
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static void screen_read_close(void)
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{
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unsigned i, j;
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char *data = G.data + G.current;
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int vcsa_fd;
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char *data;
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xread(G.vcsa_fd, data, G.size);
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// Close & re-open vcsa in case they have swapped virtual consoles
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vcsa_fd = xopen(G.vcsa_name, O_RDONLY);
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xread(vcsa_fd, &G.remote, 4);
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i = G.remote.cols * 2;
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G.first_line_offset = G.y * i;
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i *= G.remote.lines;
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if (G.data == NULL) {
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G.size = i;
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G.data = xzalloc(2 * i);
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}
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else if (G.size != i) {
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cleanup(1);
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}
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data = G.data + G.current;
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xread(vcsa_fd, data, G.size);
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close(vcsa_fd);
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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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if (CHAR(data) < ' ')
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*data = ' '; // CHAR(data) = ' ';
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CHAR(data) = ' ';
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if (y >= G.height || x >= G.width)
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DATA(data) = 0;
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}
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}
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close(G.vcsa_fd);
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}
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static void screen_char(char *data)
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@ -121,7 +178,7 @@ static void screen_char(char *data)
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if (!BW) {
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uint8_t attr = ATTR(data);
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//uint8_t attr = ATTR(data) >> 1; // for framebuffer console
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uint8_t attr_diff = (G.last_attr ^ attr) | G.force_attr_change;
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uint8_t attr_diff = G.last_attr ^ attr;
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if (attr_diff) {
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// Attribute layout for VGA compatible text videobuffer:
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@ -153,19 +210,20 @@ static void screen_char(char *data)
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const uint8_t bg_mask = 0x70, blink_mask = 0x80;
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char *ptr;
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ptr = G.attrbuf + 2; /* skip "ESC [" */
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ptr = G.attrbuf + 2; // skip "ESC ["
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// (G.last_attr & ~attr) has 1 only where
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// G.last_attr has 1 but attr has 0.
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// Here we check whether we have transition
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// bold->non-bold or blink->non-blink:
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if ((G.last_attr & ~attr) & (bold_mask | blink_mask)) {
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if (G.last_attr < 0 // initial value
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|| ((G.last_attr & ~attr) & (bold_mask | blink_mask)) != 0
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) {
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*ptr++ = '0'; // "reset all attrs"
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*ptr++ = ';';
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// must set fg & bg, maybe need to set bold or blink:
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attr_diff = attr | ~(bold_mask | blink_mask);
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}
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G.force_attr_change = 0;
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G.last_attr = attr;
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if (attr_diff & bold_mask) {
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*ptr++ = '1';
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@ -196,44 +254,12 @@ static void screen_char(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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// 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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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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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 col, int line)
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{
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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, 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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char *data = G.data + G.current + G.first_line_offset;
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linefeed_cnt = 0;
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for (line = 0; line < linecnt && line < G.height; line++) {
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@ -263,41 +289,13 @@ static void curmove(void)
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{
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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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int cursor = 1;
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if (cx >= G.width || cy >= G.height) {
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curoff();
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} else {
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curon();
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if (cx < G.width && cy < G.height) {
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gotoxy(cx, cy);
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cursor = -1;
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}
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fflush_all();
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}
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static void cleanup(int code)
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{
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curon();
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fflush_all();
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tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(G.kbd_fd);
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}
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// Reset attributes
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if (!BW)
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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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exit(code);
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}
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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.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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set_cursor(cursor);
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}
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static void create_cdev_if_doesnt_exist(const char* name, dev_t dev)
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@ -345,7 +343,6 @@ static NOINLINE void start_shell_in_child(const char* tty_name)
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int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int conspy_main(int argc UNUSED_PARAM, char **argv)
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{
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char vcsa_name[sizeof("/dev/vcsaNN")];
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char tty_name[sizeof("/dev/ttyNN")];
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#define keybuf bb_common_bufsiz1
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struct termios termbuf;
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@ -365,7 +362,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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applet_long_options = getopt_longopts;
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#endif
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INIT_G();
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strcpy(vcsa_name, "/dev/vcsa");
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strcpy(G.vcsa_name, "/dev/vcsa");
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opt_complementary = "x+:y+"; // numeric params
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opts = getopt32(argv, "vcsndfx:y:", &G.x, &G.y);
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@ -373,19 +370,19 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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ttynum = 0;
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if (argv[0]) {
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ttynum = xatou_range(argv[0], 0, 63);
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sprintf(vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
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sprintf(G.vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
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}
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sprintf(tty_name, "%s%u", "/dev/tty", ttynum);
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if (opts & FLAG(c)) {
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if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
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create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
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create_cdev_if_doesnt_exist(vcsa_name, makedev(7, 128 + ttynum));
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create_cdev_if_doesnt_exist(G.vcsa_name, makedev(7, 128 + ttynum));
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}
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if ((opts & FLAG(s)) && ttynum) {
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start_shell_in_child(tty_name);
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}
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get_initial_data(vcsa_name);
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screen_read_close();
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if (opts & FLAG(d)) {
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screen_dump();
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bb_putchar('\n');
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@ -412,17 +409,11 @@ 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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// 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.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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// in the first loop G.width = G.height = 0: refresh
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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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if (option_mask32 & FLAG(f)) {
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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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@ -454,8 +445,8 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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screen_dump();
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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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old += G.first_line_offset;
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data += G.first_line_offset;
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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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@ -463,10 +454,8 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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if (iy >= G.height)
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break;
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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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for (j = 0; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
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unsigned jx = j - G.x; // if will catch j >= G.x too
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if (jx < G.width && DATA(data) != DATA(old)) {
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last = data;
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@ -486,6 +475,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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curmove();
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// Wait for local user keypresses
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fflush_all();
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pfd.fd = G.kbd_fd;
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pfd.events = POLLIN;
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bytes_read = 0;
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@ -532,15 +522,16 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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else if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE)
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G.key_count = 0; // scan code mode
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else {
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for (i = 0; i < G.key_count && result != -1; i++)
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result = ioctl(handle, TIOCSTI, keybuf + i);
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G.key_count -= i;
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char *p = keybuf;
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for (; G.key_count != 0 && result != -1; p++, G.key_count--) {
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result = ioctl(handle, TIOCSTI, p);
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// If there is an application on console which reacts
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// to keypresses, we need to make our first sleep
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// shorter to quickly redraw whatever it printed there.
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poll_timeout_ms = 20;
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}
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if (G.key_count)
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memmove(keybuf, keybuf + i, G.key_count);
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// If there is an application on console which reacts
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// to keypresses, we need to make our first sleep
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// shorter to quickly redraw whatever it printed there.
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poll_timeout_ms = 20;
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memmove(keybuf, p, G.key_count);
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}
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// Close & re-open tty in case they have
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// swapped virtual consoles
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@ -553,5 +544,5 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
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else if (errno != EIO || ++G.ioerror_count > 4)
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cleanup(1);
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}
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}
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} /* while (1) */
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}
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