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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-03-12 23:41:07 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-03-12 23:41:07 +0000
commitc9c893d4f59418c50c8eb42bd80390026e123dd8 (patch)
treecb0db6e84ffb11eaaf2ee4d34d15807af7350842 /console-tools/resize.c
parent8a164052bfcf391368e267dae792a56b80174eba (diff)
downloadbusybox-c9c893d4f59418c50c8eb42bd80390026e123dd8.tar.gz
busybox-c9c893d4f59418c50c8eb42bd80390026e123dd8.tar.bz2
resize: make it usable in in backticks; have a timeout (if display
doesn't respond to 'get cursor pos' ESC sequence...)
Diffstat (limited to 'console-tools/resize.c')
-rw-r--r--console-tools/resize.c45
1 files changed, 37 insertions, 8 deletions
diff --git a/console-tools/resize.c b/console-tools/resize.c
index 40a1b4ee0..64f318c76 100644
--- a/console-tools/resize.c
+++ b/console-tools/resize.c
@@ -11,31 +11,60 @@
#define ESC "\033"
+struct termios old;
+
+static void
+onintr(int sig ATTRIBUTE_UNUSED)
+{
+ tcsetattr(STDERR_FILENO, TCSANOW, &old);
+ exit(1);
+}
+
+
int resize_main(int argc, char **argv);
int resize_main(int argc, char **argv)
{
- struct termios old, new;
- struct winsize w = {0,0,0,0};
+ struct termios new;
+ struct winsize w = { 0,0,0,0 };
int ret;
- tcgetattr(STDOUT_FILENO, &old); /* fiddle echo */
+ /* We use _stderr_ in order to make resize usable
+ * in shell backticks (those redirect stdout away from tty).
+ * NB: other versions of resize open "/dev/tty"
+ * and operate on it - should we do the same?
+ */
+
+ tcgetattr(STDERR_FILENO, &old); /* fiddle echo */
new = old;
new.c_cflag |= (CLOCAL | CREAD);
new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
- tcsetattr(STDOUT_FILENO, TCSANOW, &new);
+ signal(SIGINT, onintr);
+ signal(SIGQUIT, onintr);
+ signal(SIGTERM, onintr);
+ signal(SIGALRM, onintr);
+ tcsetattr(STDERR_FILENO, TCSANOW, &new);
+
/* save_cursor_pos 7
* scroll_whole_screen [r
* put_cursor_waaaay_off [$x;$yH
* get_cursor_pos [6n
* restore_cursor_pos 8
*/
- printf(ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
+ fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
+ alarm(3); /* Just in case terminal won't answer */
scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
- ret = ioctl(STDOUT_FILENO, TIOCSWINSZ, &w);
- printf(ESC"8");
- tcsetattr(STDOUT_FILENO, TCSANOW, &old);
+ fprintf(stderr, ESC"8");
+
+ /* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
+ * by calculating character cell HxW from old values
+ * (gotten via TIOCGWINSZ) and recomputing *pixel values */
+ ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
+
+ tcsetattr(STDERR_FILENO, TCSANOW, &old);
+
if (ENABLE_FEATURE_RESIZE_PRINT)
printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
w.ws_col, w.ws_row);
+
return ret;
}