source: MondoRescue/branches/2.2.5/mindi-busybox/procps/watch.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 12 years ago

Update to busybox 1.7.2

  • Property svn:eol-style set to native
File size: 2.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini watch implementation for busybox
4 *
5 * Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
6 * Copyrigjt (C) Mar 16, 2003 Manuel Novoa III   (mjn3@codepoet.org)
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9 */
10
11/* BB_AUDIT SUSv3 N/A */
12/* BB_AUDIT GNU defects -- only option -n is supported. */
13
14#include "libbb.h"
15
16// procps 2.0.18:
17// watch [-d] [-n seconds]
18//   [--differences[=cumulative]] [--interval=seconds] command
19//
20// procps-3.2.3:
21// watch [-dt] [-n seconds]
22//   [--differences[=cumulative]] [--interval=seconds] [--no-title] command
23//
24// (procps 3.x and procps 2.x are forks, not newer/older versions of the same)
25
26int watch_main(int argc, char **argv);
27int watch_main(int argc, char **argv)
28{
29    unsigned opt;
30    unsigned period = 2;
31    unsigned cmdlen;
32    char *header = NULL;
33    char *cmd;
34    char *tmp;
35    char **p;
36
37    opt_complementary = "-1"; // at least one param please
38    opt = getopt32(argv, "+dtn:", &tmp);
39    //if (opt & 0x1) // -d (ignore)
40    //if (opt & 0x2) // -t
41    if (opt & 0x4) period = xatou(tmp);
42    argv += optind;
43
44    p = argv;
45    cmdlen = 1; // 1 for terminal NUL
46    while (*p)
47        cmdlen += strlen(*p++) + 1;
48    tmp = cmd = xmalloc(cmdlen);
49    while (*argv) {
50        tmp += sprintf(tmp, " %s", *argv);
51        argv++;
52    }
53    cmd++; // skip initial space
54
55    while (1) {
56        printf("\033[H\033[J");
57        if (!(opt & 0x2)) { // no -t
58            int width, len;
59            char *thyme;
60            time_t t;
61
62            get_terminal_width_height(STDIN_FILENO, &width, 0);
63            header = xrealloc(header, width--);
64            // '%-*s' pads header with spaces to the full width
65            snprintf(header, width, "Every %ds: %-*s", period, width, cmd);
66            time(&t);
67            thyme = ctime(&t);
68            len = strlen(thyme);
69            if (len < width)
70                strcpy(header + width - len, thyme);
71            puts(header);
72        }
73        fflush(stdout);
74        // TODO: 'real' watch pipes cmd's output to itself
75        // and does not allow it to overflow the screen
76        // (taking into account linewrap!)
77        system(cmd);
78        sleep(period);
79    }
80    return 0; // gcc thinks we can reach this :)
81}
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