procps/watch.c

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/* watch -- execute a program repeatedly, displaying output fullscreen
*
* Based on the original 1991 'watch' by Tony Rems <rembo@unisoft.com>
* (with mods and corrections by Francois Pinard).
*
* Substantially reworked, new features (differences option, SIGWINCH
* handling, unlimited command length, long line handling) added Apr 1999 by
* Mike Coleman <mkc@acm.org>.
*
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* Changes by Albert Cahalan, 2002-2003.
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*/
#define VERSION "0.2.0"
#include <ctype.h>
#include <getopt.h>
#include <signal.h>
#include <ncurses.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>
#include <locale.h>
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#include "proc/procps.h"
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static struct option longopts[] = {
{"differences", optional_argument, 0, 'd'},
{"help", no_argument, 0, 'h'},
{"interval", required_argument, 0, 'n'},
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{"no-title", no_argument, 0, 't'},
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{"version", no_argument, 0, 'v'},
{0, 0, 0, 0}
};
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static char usage[] =
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"Usage: %s [-dhntv] [--differences[=cumulative]] [--help] [--interval=<n>] [--no-title] [--version] <command>\n";
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static char *progname;
static int curses_started = 0;
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static int height = 24, width = 80;
static int screen_size_changed = 0;
static int first_screen = 1;
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static int show_title = 2; // number of lines used, 2 or 0
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#define min(x,y) ((x) > (y) ? (y) : (x))
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static void do_usage(void) NORETURN;
static void do_usage(void)
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{
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fprintf(stderr, usage, progname);
exit(1);
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}
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static void do_exit(int status) NORETURN;
static void do_exit(int status)
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{
if (curses_started)
endwin();
exit(status);
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}
/* signal handler */
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static void die(int notused) NORETURN;
static void die(int notused)
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{
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(void) notused;
do_exit(0);
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}
static void
winch_handler(int notused)
{
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(void) notused;
screen_size_changed = 1;
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}
static void
get_terminal_size(void)
{
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struct winsize w;
if (ioctl(2, TIOCGWINSZ, &w) == 0) {
if (w.ws_row > 0)
height = w.ws_row;
if (w.ws_col > 0)
width = w.ws_col;
}
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}
int
main(int argc, char *argv[])
{
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int optc;
int option_differences = 0,
option_differences_cumulative = 0,
option_help = 0, option_version = 0;
int interval = 2;
char *command;
int command_length = 0; /* not including final \0 */
setlocale(LC_ALL, "");
progname = argv[0];
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while ((optc = getopt_long(argc, argv, "+d::hn:vt", longopts, (int *) 0))
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!= EOF) {
switch (optc) {
case 'd':
option_differences = 1;
if (optarg)
option_differences_cumulative = 1;
break;
case 'h':
option_help = 1;
break;
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case 't':
show_title = 0;
break;
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case 'n':
{
char *str;
interval = strtol(optarg, &str, 10);
if (!*optarg || *str)
do_usage();
}
break;
case 'v':
option_version = 1;
break;
default:
do_usage();
break;
}
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}
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if (option_version) {
fprintf(stderr, "%s\n", VERSION);
if (!option_help)
exit(0);
}
if (option_help) {
fprintf(stderr, usage, progname);
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fputs(" -d, --differences[=cumulative]\thighlight changes between updates\n", stderr);
fputs("\t\t(cumulative means highlighting is cumulative)\n", stderr);
fputs(" -h, --help\t\t\t\tprint a summary of the options\n", stderr);
fputs(" -n, --interval=<seconds>\t\tseconds to wait between updates\n", stderr);
fputs(" -v, --version\t\t\t\tprint the version number\n", stderr);
fputs(" -t, --no-title\t\t\tturns off showing the header\n", stderr);
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exit(0);
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}
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if (optind >= argc)
do_usage();
command = strdup(argv[optind++]);
command_length = strlen(command);
for (; optind < argc; optind++) {
char *endp;
int s = strlen(argv[optind]);
command = realloc(command, command_length + s + 2); /* space and \0 */
endp = command + command_length;
*endp = ' ';
memcpy(endp + 1, argv[optind], s);
command_length += 1 + s; /* space then string length */
command[command_length] = '\0';
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}
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get_terminal_size();
/* Catch keyboard interrupts so we can put tty back in a sane state. */
signal(SIGINT, die);
signal(SIGTERM, die);
signal(SIGHUP, die);
signal(SIGWINCH, winch_handler);
/* Set up tty for curses use. */
curses_started = 1;
initscr();
nonl();
noecho();
cbreak();
for (;;) {
time_t t = time(NULL);
char *ts = ctime(&t);
int tsl = strlen(ts);
char *header;
FILE *p;
int x, y;
int oldeolseen = 1;
if (screen_size_changed) {
get_terminal_size();
resizeterm(height, width);
clear();
/* redrawwin(stdscr); */
screen_size_changed = 0;
first_screen = 1;
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}
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if (show_title) {
// left justify interval and command,
// right justify time, clipping all to fit window width
asprintf(&header, "Every %ds: %.*s",
interval, min(width - 1, command_length), command);
mvaddstr(0, 0, header);
if (strlen(header) > (size_t) (width - tsl - 1))
mvaddstr(0, width - tsl - 4, "... ");
mvaddstr(0, width - tsl + 1, ts);
free(header);
}
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if (!(p = popen(command, "r"))) {
perror("popen");
do_exit(2);
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}
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for (y = show_title; y < height; y++) {
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int eolseen = 0, tabpending = 0;
for (x = 0; x < width; x++) {
int c = ' ';
int attr = 0;
if (!eolseen) {
/* if there is a tab pending, just spit spaces until the
next stop instead of reading characters */
if (!tabpending)
do
c = getc(p);
while (c != EOF && !isprint(c)
&& c != '\n'
&& c != '\t');
if (c == '\n')
if (!oldeolseen && x == 0) {
x = -1;
continue;
} else
eolseen = 1;
else if (c == '\t')
tabpending = 1;
if (c == EOF || c == '\n' || c == '\t')
c = ' ';
if (tabpending && (((x + 1) % 8) == 0))
tabpending = 0;
}
move(y, x);
if (option_differences) {
int oldch = inch();
char oldc = oldch & A_CHARTEXT;
attr = !first_screen
&& (c != oldc
||
(option_differences_cumulative
&& (oldch & A_ATTRIBUTES)));
}
if (attr)
standout();
addch(c);
if (attr)
standend();
}
oldeolseen = eolseen;
}
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pclose(p);
first_screen = 0;
refresh();
sleep(interval);
}
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endwin();
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return 0;
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}