/*
* resize - set terminal width and height.
*
- * Copyright 2006 Bernhard Fischer
+ * Copyright 2006 Bernhard Reutner-Fischer
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-/* no options, no getopt */
-#include "busybox.h"
+//config:config RESIZE
+//config: bool "resize (756 bytes)"
+//config: default y
+//config: help
+//config: This program is used to (re)set the width and height of your current
+//config: terminal.
+//config:
+//config:config FEATURE_RESIZE_PRINT
+//config: bool "Print environment variables"
+//config: default y
+//config: depends on RESIZE
+//config: help
+//config: Prints the newly set size (number of columns and rows) of
+//config: the terminal.
+//config: E.g.:
+//config: COLUMNS=80;LINES=44;export COLUMNS LINES;
+
+//applet:IF_RESIZE(APPLET_NOEXEC(resize, resize, BB_DIR_USR_BIN, BB_SUID_DROP, resize))
+/* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
+
+//kbuild:lib-$(CONFIG_RESIZE) += resize.o
+
+//usage:#define resize_trivial_usage
+//usage: ""
+//usage:#define resize_full_usage "\n\n"
+//usage: "Resize the screen"
+
+#include "libbb.h"
+#include "common_bufsiz.h"
#define ESC "\033"
-int resize_main(int argc, char **argv);
-int resize_main(int argc, char **argv)
+#define old_termios_p ((struct termios*)bb_common_bufsiz1)
+#define INIT_G() do { setup_common_bufsiz(); } while (0)
+
+static void
+onintr(int sig UNUSED_PARAM)
+{
+ tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
+ _exit(EXIT_FAILURE);
+}
+
+int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
- struct termios old, new;
- struct winsize w = {0,0,0,0};
+ struct termios new;
+ struct winsize w = { 0, 0, 0, 0 };
int ret;
- tcgetattr(STDOUT_FILENO, &old); /* fiddle echo */
- new = old;
+ INIT_G();
+
+ /* We use _stderr_ in order to make resize usable
+ * in shell backticks (those redirect stdout away from tty).
+ * NB: other versions of resize open "/dev/tty"
+ * and operate on it - should we do the same?
+ */
+
+ tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
+//TODO: die if the above fails?
+ memcpy(&new, old_termios_p, sizeof(new));
new.c_cflag |= (CLOCAL | CREAD);
new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
- tcsetattr(STDOUT_FILENO, TCSANOW, &new);
+ bb_signals(0
+ + (1 << SIGINT)
+ + (1 << SIGQUIT)
+ + (1 << SIGTERM)
+ + (1 << SIGALRM)
+ , onintr);
+ tcsetattr(STDERR_FILENO, TCSANOW, &new);
+
/* save_cursor_pos 7
* scroll_whole_screen [r
* put_cursor_waaaay_off [$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 */
+//BUG: death by signal won't restore termios
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_termios_p);
+
if (ENABLE_FEATURE_RESIZE_PRINT)
printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
w.ws_col, w.ws_row);
+
return ret;
}