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watch.c - ubase - suckless linux base utils
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watch.c (1069B)
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1 /* See LICENSE file for copyright and license details. */
2 #include <errno.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <unistd.h>
6
7 #include "util.h"
8
9 static void
10 usage(void)
11 {
12 eprintf("usage: %s [-t] [-n interval] command\n", argv0);
13 }
14
15 int
16 main(int argc, char *argv[])
17 {
18 char cmd[BUFSIZ];
19 char *end;
20 useconds_t interval = 2 * 1E6;
21 float period;
22 int i;
23
24 ARGBEGIN {
25 case 't':
26 break;
27 case 'n':
28 period = strtof(EARGF(usage()), &end);
29 if (*end != '\0' || errno != 0)
30 eprintf("invalid interval\n");
31 if (period < 0)
32 period = 0.1f;
33 interval = period * 1E6;
34 break;
35 default:
36 usage();
37 } ARGEND;
38
39 if (argc < 1)
40 usage();
41
42 if (strlcpy(cmd, argv[0], sizeof(cmd)) >= sizeof(cmd))
43 eprintf("command too long\n");
44 for (i = 1; i < argc; i++) {
45 if (strlcat(cmd, " ", sizeof(cmd)) >= sizeof(cmd))
46 eprintf("command too long\n");
47 if (strlcat(cmd, argv[i], sizeof(cmd)) >= sizeof(cmd))
48 eprintf("command too long\n");
49 }
50
51 for (;;) {
52 printf("\x1b[2J\x1b[H"); /* clear */
53 fflush(NULL);
54 system(cmd);
55 usleep(interval);
56 }
57 return 0;
58 }
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