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