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)
30 unsigned cmdlen = 1; // 1 for terminal NUL
36 opt_complementary = "-1"; // at least one param please
37 opt = getopt32(argc, argv, "+dtn:", &tmp);
38 //if (opt & 0x1) // -d (ignore)
39 //if (opt & 0x2) // -t
40 if (opt & 0x4) period = xatou(tmp);
45 cmdlen += strlen(*p++) + 1;
46 tmp = cmd = xmalloc(cmdlen);
48 tmp += sprintf(tmp, " %s", *argv);
51 cmd++; // skip initial space
54 printf("\033[H\033[J");
55 if (!(opt & 0x2)) { // no -t
60 get_terminal_width_height(STDOUT_FILENO, &width, 0);
61 if (width < 1) width = 1; // paranoia
62 header = xrealloc(header, width--);
63 // '%-*s' pads header with spaces to the full width
64 snprintf(header, width, "Every %ds: %-*s", period, width, cmd);
69 strcpy(header + width - len, thyme);
73 // TODO: 'real' watch pipes cmd's output to itself
74 // and does not allow it to overflow the screen
75 // (taking into account linewrap!)
79 return 0; // gcc thinks we can reach this :)