X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=console-tools%2Fresize.c;h=64f318c76ca38d90ebcd608c5e74b5d87212ed2c;hb=794687947fe9eb15b2512a0d9645d827348c5f6f;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hpb=03721973851afbe02bbc1cdc56ee6002631c4df6;p=oweals%2Fbusybox.git

diff --git a/console-tools/resize.c b/console-tools/resize.c
index e69de29bb..64f318c76 100644
--- a/console-tools/resize.c
+++ b/console-tools/resize.c
@@ -0,0 +1,70 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * resize - set terminal width and height.
+ *
+ * Copyright 2006 Bernhard Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+/* no options, no getopt */
+#include "busybox.h"
+
+#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 new;
+	struct winsize w = { 0,0,0,0 };
+	int ret;
+
+	/* 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);
+	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
+	 */
+	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);
+	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;
+}