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81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini watch implementation for busybox
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*
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* Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
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* Copyrigjt (C) Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 N/A */
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/* BB_AUDIT GNU defects -- only option -n is supported. */
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#include "libbb.h"
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// procps 2.0.18:
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// watch [-d] [-n seconds]
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// [--differences[=cumulative]] [--interval=seconds] command
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//
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// procps-3.2.3:
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// watch [-dt] [-n seconds]
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// [--differences[=cumulative]] [--interval=seconds] [--no-title] command
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//
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// (procps 3.x and procps 2.x are forks, not newer/older versions of the same)
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int watch_main(int argc, char **argv);
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int watch_main(int argc, char **argv)
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{
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unsigned opt;
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unsigned period = 2;
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unsigned cmdlen = 1; // 1 for terminal NUL
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char *header = NULL;
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char *cmd;
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char *tmp;
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char **p;
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opt_complementary = "-1"; // at least one param please
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opt = getopt32(argc, argv, "+dtn:", &tmp);
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//if (opt & 0x1) // -d (ignore)
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//if (opt & 0x2) // -t
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if (opt & 0x4) period = xatou(tmp);
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argv += optind;
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p = argv;
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while (*p)
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cmdlen += strlen(*p++) + 1;
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tmp = cmd = xmalloc(cmdlen);
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while (*argv) {
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tmp += sprintf(tmp, " %s", *argv);
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argv++;
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}
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cmd++; // skip initial space
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while (1) {
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printf("\033[H\033[J");
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if (!(opt & 0x2)) { // no -t
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int width, len;
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char *thyme;
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time_t t;
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get_terminal_width_height(STDOUT_FILENO, &width, 0);
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header = xrealloc(header, width--);
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// '%-*s' pads header with spaces to the full width
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snprintf(header, width, "Every %ds: %-*s", period, width, cmd);
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time(&t);
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thyme = ctime(&t);
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len = strlen(thyme);
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if (len < width)
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strcpy(header + width - len, thyme);
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puts(header);
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}
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fflush(stdout);
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// TODO: 'real' watch pipes cmd's output to itself
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// and does not allow it to overflow the screen
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// (taking into account linewrap!)
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system(cmd);
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sleep(period);
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}
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return 0; // gcc thinks we can reach this :)
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}
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