[1765] | 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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