[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini watch implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | */
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| 9 |
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| 10 | /* BB_AUDIT SUSv3 N/A */
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| 11 | /* BB_AUDIT GNU defects -- only option -n is supported. */
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| 12 |
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| 13 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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| 14 | *
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| 15 | * Removed dependency on date_main(), added proper error checking, and
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| 16 | * reduced size.
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| 17 | */
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| 18 |
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| 19 | #include <stdio.h>
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| 20 | #include <stdlib.h>
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| 21 | #include <string.h>
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| 22 | #include <limits.h>
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| 23 | #include <time.h>
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| 24 | #include <assert.h>
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| 25 | #include <unistd.h>
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| 26 | #include <sys/wait.h>
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| 27 | #include "busybox.h"
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| 28 |
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| 29 | int watch_main(int argc, char **argv)
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| 30 | {
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| 31 | int width, len;
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| 32 | unsigned period = 2;
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| 33 | char **watched_argv, *header;
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| 34 |
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| 35 | if (argc < 2) bb_show_usage();
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| 36 |
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| 37 | get_terminal_width_height(1, &width, 0);
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| 38 | header = xzalloc(width--);
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| 39 |
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| 40 | /* don't use getopt, because it permutes the arguments */
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| 41 | ++argv;
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| 42 | if ((argc > 3) && !strcmp(*argv, "-n")) {
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| 43 | period = bb_xgetularg10_bnd(argv[1], 1, UINT_MAX);
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| 44 | argv += 2;
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| 45 | }
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| 46 | watched_argv = argv;
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| 47 |
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| 48 | /* create header */
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| 49 |
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| 50 | len = snprintf(header, width, "Every %ds:", period);
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| 51 | while (*argv && len<width)
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| 52 | snprintf(header+len, width-len, " %s", *(argv++));
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| 53 |
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| 54 | while (1) {
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| 55 | char *thyme;
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| 56 | time_t t;
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| 57 |
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| 58 | time(&t);
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| 59 | thyme = ctime(&t);
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| 60 | len = strlen(thyme);
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| 61 | if (len < width) header[width-len] = 0;
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| 62 |
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| 63 | printf("\033[H\033[J%s %s\n", header, thyme);
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| 64 |
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| 65 | waitpid(bb_xspawn(watched_argv),0,0);
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| 66 | sleep(period);
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| 67 | }
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| 68 | }
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