procps 010114
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csmall
277
watch.c
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277
watch.c
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/* watch -- execute a program repeatedly, displaying output fullscreen
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*
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* Based on the original 1991 'watch' by Tony Rems <rembo@unisoft.com>
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* (with mods and corrections by Francois Pinard).
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*
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* Substantially reworked, new features (differences option, SIGWINCH
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* handling, unlimited command length, long line handling) added Apr 1999 by
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* Mike Coleman <mkc@acm.org>.
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*/
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#define VERSION "0.2.0"
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#include <ctype.h>
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#include <getopt.h>
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#include <signal.h>
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#include <ncurses.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <time.h>
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#include <unistd.h>
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static struct option longopts[] =
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{
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{ "differences", optional_argument, 0, 'd' },
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{ "help", no_argument, 0, 'h' },
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{ "interval", required_argument, 0, 'n' },
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{ "version", no_argument, 0, 'v' },
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{ 0, 0, 0, 0 }
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};
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static char usage[] = "Usage: %s [-dhnv] [--differences[=cumulative]] [--help] [--interval=<n>] [--version] <command>\n";
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static char *progname;
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static int curses_started = 0;
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static int height=24, width=80;
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static int screen_size_changed=0;
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static int first_screen=1;
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#define min(x,y) ((x) > (y) ? (y) : (x))
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#define max(x,y) ((x) > (y) ? (x) : (y))
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static void
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do_usage(void)
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{
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fprintf(stderr, usage, progname);
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exit(1);
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}
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static void
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do_exit(int status) {
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if (curses_started)
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endwin();
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exit(status);
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}
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/* signal handler */
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static void
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die(int notused)
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{
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(void)notused;
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do_exit(0);
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}
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static void
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winch_handler(int notused)
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{
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(void)notused;
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screen_size_changed = 1;
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}
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static void
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get_terminal_size(void)
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{
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struct winsize w;
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if (ioctl(2, TIOCGWINSZ, &w) == 0)
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{
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if (w.ws_row > 0)
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height = w.ws_row;
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if (w.ws_col > 0)
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width = w.ws_col;
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}
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}
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int
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main(int argc, char *argv[])
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{
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int optc;
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int option_differences=0,
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option_differences_cumulative=0,
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option_help=0,
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option_version=0;
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int interval=2;
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char *command;
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int command_length=0; /* not including final \0 */
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progname = argv[0];
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while ((optc = getopt_long(argc, argv, "+d::hn:v", longopts, (int *) 0))
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!= EOF)
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{
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switch (optc)
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{
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case 'd':
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option_differences = 1;
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if (optarg)
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option_differences_cumulative = 1;
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break;
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case 'h':
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option_help = 1;
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break;
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case 'n':
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{
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char *s;
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interval = strtol(optarg, &s, 10);
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if (!*optarg || *s)
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do_usage();
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}
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break;
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case 'v':
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option_version = 1;
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break;
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default:
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do_usage();
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break;
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}
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}
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if (option_version)
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{
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fprintf (stderr, "%s\n", VERSION);
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if (!option_help)
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exit(0);
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}
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if (option_help)
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{
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fprintf(stderr, usage, progname);
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fputs(" -d, --differences[=cumulative]\thighlight changes between updates\n", stderr);
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fputs("\t\t(cumulative means highlighting is cumulative)\n", stderr);
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fputs(" -h, --help\t\t\t\tprint a summary of the options\n", stderr);
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fputs(" -n, --interval=<seconds>\t\tseconds to wait between updates\n", stderr);
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fputs(" -v, --version\t\t\t\tprint the version number\n", stderr);
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exit(0);
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}
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if (optind >= argc)
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do_usage();
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command = strdup(argv[optind++]);
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command_length = strlen(command);
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for (;optind<argc;optind++)
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{
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int s = strlen(argv[optind]);
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char *endp = &command[command_length];
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*endp = ' ';
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command_length += s + 1;
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command = realloc(command, command_length+1);
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strcpy(endp+1, argv[optind]);
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}
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get_terminal_size();
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/* Catch keyboard interrupts so we can put tty back in a sane state. */
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signal(SIGINT, die);
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signal(SIGTERM, die);
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signal(SIGHUP, die);
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signal(SIGWINCH, winch_handler);
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/* Set up tty for curses use. */
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curses_started = 1;
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initscr();
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nonl();
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noecho();
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cbreak();
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for(;;)
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{
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time_t t = time(NULL);
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char *ts = ctime(&t);
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int tsl = strlen(ts);
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char *header;
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FILE *p;
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int x, y;
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if (screen_size_changed)
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{
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get_terminal_size();
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resizeterm(height, width);
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clear();
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/* redrawwin(stdscr); */
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screen_size_changed = 0;
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first_screen = 1;
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}
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/* left justify interval and command, right justify time, clipping all
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to fit window width */
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asprintf(&header, "Every %ds: %.*s",
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interval, max(width-1, command_length), command);
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mvaddstr(0, 0, header);
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if (strlen(header) > width - tsl - 1)
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mvaddstr(0, width - tsl - 4, "... ");
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mvaddstr(0, width - tsl + 1, ts);
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free(header);
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if (!(p = popen(command, "r")))
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{
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perror("popen");
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do_exit(2);
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}
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for (y=2; y<height; y++)
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{
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int eolseen = 0, tabpending = 0;
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for (x=0; x<width; x++)
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{
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int c = ' ';
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int attr = 0;
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if (!eolseen)
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{
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/* if there is a tab pending, just spit spaces until the
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next stop instead of reading characters */
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if (!tabpending)
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do
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c = getc(p);
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while (c != EOF && !isprint(c) && c != '\n' && c != '\t');
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if (c == '\n')
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eolseen = 1;
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else if (c == '\t')
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tabpending = 1;
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if (c == EOF || c == '\n' || c == '\t')
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c = ' ';
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if (tabpending && (((x + 1) % 8) == 0))
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tabpending = 0;
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}
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move(y, x);
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if (option_differences)
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{
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int oldch = inch();
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char oldc = oldch & A_CHARTEXT;
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attr = !first_screen
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&& (c != oldc
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|| (option_differences_cumulative
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&& (oldch & A_ATTRIBUTES)));
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}
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if (attr)
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standout();
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addch(c);
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if (attr)
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standend();
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}
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}
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pclose(p);
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first_screen = 0;
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refresh();
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sleep(interval);
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}
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endwin();
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return 0;
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}
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