1 /* vi: set sw=4 ts=4: */
3 * Mini watch implementation for busybox
5 * Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
6 * Copyrigjt (C) Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 /* BB_AUDIT SUSv3 N/A */
12 /* BB_AUDIT GNU defects -- only option -n is supported. */
17 // watch [-d] [-n seconds]
18 // [--differences[=cumulative]] [--interval=seconds] command
21 // watch [-dt] [-n seconds]
22 // [--differences[=cumulative]] [--interval=seconds] [--no-title] command
24 // (procps 3.x and procps 2.x are forks, not newer/older versions of the same)
26 int watch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
27 int watch_main(int argc UNUSED_PARAM, char **argv)
31 unsigned width, new_width;
35 opt_complementary = "-1:n+"; // at least one param; -n NUM
36 // "+": stop at first non-option (procps 3.x only)
37 opt = getopt32(argv, "+dtn:", &period);
40 // watch from both procps 2.x and 3.x does concatenation. Example:
41 // watch ls -l "a /tmp" "2>&1" -- ls won't see "a /tmp" as one param
44 cmd = xasprintf("%s %s", cmd, *argv); // leaks cmd
46 width = (unsigned)-1; // make sure first time new_width != width
49 printf("\033[H\033[J");
50 if (!(opt & 0x2)) { // no -t
51 const unsigned time_len = sizeof("1234-67-90 23:56:89");
54 get_terminal_width_height(STDIN_FILENO, &new_width, NULL);
55 if (new_width != width) {
58 header = xasprintf("Every %us: %-*s", period, (int)width, cmd);
62 strftime(header + width - time_len, time_len,
63 "%Y-%m-%d %H:%M:%S", localtime(&t));
68 // TODO: 'real' watch pipes cmd's output to itself
69 // and does not allow it to overflow the screen
70 // (taking into account linewrap!)
74 return 0; // gcc thinks we can reach this :)