Bump to version 1.22.1

[platform/upstream/busybox.git] / console-tools / resize.c

diff --git a/console-tools/resize.c b/console-tools/resize.c
index e69de29..4b0d63a 100644 (file)
--- a/console-tools/resize.c
+++ b/console-tools/resize.c
@@ -0,0 +1,78 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * resize - set terminal width and height.
+ *
+ * Copyright 2006 Bernhard Reutner-Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+/* no options, no getopt */
+
+//usage:#define resize_trivial_usage
+//usage:       ""
+//usage:#define resize_full_usage "\n\n"
+//usage:       "Resize the screen"
+
+#include "libbb.h"
+
+#define ESC "\033"
+
+#define old_termios_p ((struct termios*)&bb_common_bufsiz1)
+
+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 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_termios_p); /* fiddle echo */
+       memcpy(&new, old_termios_p, sizeof(new));
+       new.c_cflag |= (CLOCAL | CREAD);
+       new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
+       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
+        */
+       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);
+       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;
+}