From e021938408ddaae5e672ad7cdbd87c614f3562f6 Mon Sep 17 00:00:00 2001
From: Nate Lawson <njl@FreeBSD.org>
Date: Thu, 14 Nov 2002 00:20:58 +0000
Subject: [PATCH] Back out previous commit since there is controversy about
 changing so much in sleep including duping strtol(3).  Code changes also
 increased dynamic size of sleep(1).

---
 bin/sleep/sleep.c | 54 ++++++++++++++++++++++++++---------------------
 1 file changed, 30 insertions(+), 24 deletions(-)

diff --git a/bin/sleep/sleep.c b/bin/sleep/sleep.c
index 6fff014f9328..7b1fb2a25e3e 100644
--- a/bin/sleep/sleep.c
+++ b/bin/sleep/sleep.c
@@ -47,10 +47,10 @@ __FBSDID("$FreeBSD$");
 
 #include <ctype.h>
 #include <limits.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
 #include <unistd.h>
-#include <string.h>
 
 void usage(void);
 
@@ -59,44 +59,51 @@ main(int argc, char *argv[])
 {
 	struct timespec time_to_sleep;
 	long l;
+	int ch, neg;
 	char *p;
 
-	if (argc != 2) {
+	while ((ch = getopt(argc, argv, "")) != -1)
+		switch(ch) {
+		case '?':
+		default:
+			usage();
+			/* NOTREACHED */
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 1) {
 		usage();
 		/* NOTREACHED */
 	}
 
-	p = argv[1];
+	p = argv[0];
 
 	/* Skip over leading whitespaces. */
-	while (isspace(*p))
+	while (isspace((unsigned char)*p))
 		++p;
 
-	/* Argument must be an int or float with optional +/- */
-	if (!isdigit(*p)) {
-		if (*p == '+')
-			++p;
-		else if (*p == '-' && isdigit(p[1]))
-			exit(0);
-		else if (*p != '.')
-			usage();
-			/* NOTREACHED */
+	/* Check for optional `+' or `-' sign. */
+	neg = 0;
+	if (*p == '-') {
+		neg = 1;
+		++p;
 	}
+	else if (*p == '+')
+		++p;
 
 	/* Calculate seconds. */
-	l = 0;
-	while (isdigit(*p)) {
-		l = (l * 10) + (*p - '0');
-		if (l > INT_MAX || l < 0) {
+	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;
-			break;
 		}
-		++p;
-	}
+	} else
+		l = 0;
 	time_to_sleep.tv_sec = (time_t)l;
 
 	/* Calculate nanoseconds. */
@@ -105,14 +112,14 @@ main(int argc, char *argv[])
 	if (*p == '.') {		/* Decimal point. */
 		l = 100000000L;
 		do {
-			if (isdigit(*++p))
+			if (isdigit((unsigned char)*++p))
 				time_to_sleep.tv_nsec += (*p - '0') * l;
 			else
 				break;
 		} while (l /= 10);
 	}
 
-	if (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0)
+	if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
 		(void)nanosleep(&time_to_sleep, (struct timespec *)NULL);
 
 	exit(0);
@@ -121,8 +128,7 @@ main(int argc, char *argv[])
 void
 usage(void)
 {
-	const char *msg = "usage: sleep seconds\n";
 
-	write(STDERR_FILENO, msg, strlen(msg));
+	(void)fprintf(stderr, "usage: sleep seconds\n");
 	exit(1);
 }