From 5fd83771641d15c418f747bd343ba6738d3875f7 Mon Sep 17 00:00:00 2001
From: Cameron Katri <me@cameronkatri.com>
Date: Sun, 9 May 2021 14:20:58 -0400
Subject: Import macOS userland

adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
---
 shell_cmds/sleep/sleep.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 shell_cmds/sleep/sleep.c

(limited to 'shell_cmds/sleep/sleep.c')

diff --git a/shell_cmds/sleep/sleep.c b/shell_cmds/sleep/sleep.c
new file mode 100644
index 0000000..d41556c
--- /dev/null
+++ b/shell_cmds/sleep/sleep.c
@@ -0,0 +1,131 @@
+/*-
+ * Copyright (c) 1988, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 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.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if 0
+#ifndef lint
+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
+static char sccsid[] = "@(#)sleep.c	8.3 (Berkeley) 4/2/94";
+#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 <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <string.h>
+
+void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	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);
+	}
+
+	/* Skip over leading whitespaces. */
+	while (isspace((unsigned char)*p))
+		++p;
+
+	/* Check for optional `+' or `-' sign. */
+	neg = 0;
+	if (*p == '-') {
+		neg = 1;
+		++p;
+		if (!isdigit((unsigned char)*p) && *p != '.') {
+			usage();
+			return(1);
+		}
+	}
+	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);
+	}
+
+	if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
+		(void)nanosleep(&time_to_sleep, (struct timespec *)NULL);
+
+	return(0);
+}
+
+void
+usage(void)
+{
+	const char msg[] = "usage: sleep seconds\n";
+
+	write(STDERR_FILENO, msg, sizeof(msg) - 1);
+}
-- 
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