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	watch.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	watch.c (1069B)
	---
	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 }