-/* $NetBSD: sleep.c,v 1.15 1998/07/28 11:41:58 mycroft Exp $ */
-
-/*
+/*-
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* SUCH DAMAGE.
*/
-#include <sys/cdefs.h>
+#if 0
#ifndef lint
-__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\
- The Regents of the University of California. All rights reserved.\n");
+static char const copyright[] =
+"@(#) Copyright (c) 1988, 1993, 1994\n\
+ The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
-#if 0
static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94";
-#else
-__RCSID("$NetBSD: sleep.c,v 1.15 1998/07/28 11:41:58 mycroft Exp $");
-#endif
#endif /* not lint */
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/bin/sleep/sleep.c,v 1.20 2005/08/07 09:11:38 stefanf Exp $");
-#include <time.h>
#include <ctype.h>
-#include <math.h>
-#include <signal.h>
+#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
+#include <time.h>
#include <unistd.h>
-#include <locale.h>
+#include <string.h>
-void usage __P((void));
-void alarmhandle __P((int));
-int main __P((int, char *[]));
+void usage(void);
int
-main(argc, argv)
- int argc;
- char *argv[];
+main(int argc, char *argv[])
{
- char *arg, *temp;
- double val, ival, fval;
- struct timespec ntime;
- int fracflag;
- int ch;
-
- (void)setlocale(LC_ALL, "");
+ struct timespec time_to_sleep;
+ long l;
+ int neg;
+ char *p;
+
+ if (argc == 2) {
+ p = argv[1];
+ } else if (argc == 3 && !strcmp("--", argv[1])) {
+ // POSIX issue: "sleep -- 3" should be the same as "sleep 3",
+ // normally getopt makes this kind of thing work, but sleep has
+ // no options, so we do it "the easy way"
+ p = argv[2];
+ } else {
+ usage();
+ return(1);
+ }
- (void)signal(SIGALRM, alarmhandle);
+ /* Skip over leading whitespaces. */
+ while (isspace((unsigned char)*p))
+ ++p;
- while ((ch = getopt(argc, argv, "")) != -1)
- switch(ch) {
- case '?':
- default:
+ /* Check for optional `+' or `-' sign. */
+ neg = 0;
+ if (*p == '-') {
+ neg = 1;
+ ++p;
+ if (!isdigit((unsigned char)*p) && *p != '.') {
usage();
+ return(1);
}
- argc -= optind;
- argv += optind;
-
- if (argc != 1)
- usage();
-
- /*
- * Okay, why not just use atof for everything? Why bother
- * checking if there is a fraction in use? Because the old
- * sleep handled the full range of integers, that's why, and a
- * double can't handle a large long. This is fairly useless
- * given how large a number a double can hold on most
- * machines, but now we won't ever have trouble. If you want
- * 1000000000.9 seconds of sleep, well, that's your
- * problem. Why use an isdigit() check instead of checking for
- * a period? Because doing it this way means locales will be
- * handled transparently by the atof code.
- */
- fracflag = 0;
- arg = *argv;
- for (temp = arg; *temp != '\0'; temp++)
- if (!isdigit(*temp))
- fracflag++;
-
- if (fracflag) {
- val = atof(arg);
- if (val <= 0)
- exit(0);
- ival = floor(val);
- fval = (1000000000 * (val-ival));
- ntime.tv_sec = ival;
- ntime.tv_nsec = fval;
}
- else{
- ntime.tv_sec = atol(arg);
- if (ntime.tv_sec <= 0)
- exit(0);
- ntime.tv_nsec = 0;
+ else if (*p == '+')
+ ++p;
+
+ /* Calculate seconds. */
+ if (isdigit((unsigned char)*p)) {
+ l = strtol(p, &p, 10);
+ if (l > INT_MAX) {
+ /*
+ * Avoid overflow when `seconds' is huge. This assumes
+ * that the maximum value for a time_t is <= INT_MAX.
+ */
+ l = INT_MAX;
+ }
+ } else
+ l = 0;
+ time_to_sleep.tv_sec = (time_t)l;
+
+ /* Calculate nanoseconds. */
+ time_to_sleep.tv_nsec = 0;
+
+ if (*p == '.') { /* Decimal point. */
+ l = 100000000L;
+ do {
+ if (isdigit((unsigned char)*++p))
+ time_to_sleep.tv_nsec += (*p - '0') * l;
+ else
+ break;
+ l /= 10;
+ } while (l);
}
- (void)nanosleep(&ntime, NULL);
+ if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
+ (void)nanosleep(&time_to_sleep, (struct timespec *)NULL);
- exit(0);
- /* NOTREACHED */
+ return(0);
}
void
-usage()
+usage(void)
{
- (void)fputs("usage: sleep seconds\n", stderr);
- exit(1);
- /* NOTREACHED */
-}
+ const char msg[] = "usage: sleep seconds\n";
-/* ARGSUSED */
-void
-alarmhandle(i)
- int i;
-{
- _exit(0);
- /* NOTREACHED */
+ write(STDERR_FILENO, msg, sizeof(msg) - 1);
}
projects / apple / shell_cmds.git / blobdiff