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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