Merge branch 'vendor/OPENSSL'
[dragonfly.git] / bin / sleep / sleep.c
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1/*
2 * Copyright (c) 1988, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)sleep.c 8.3 (Berkeley) 4/2/94
35 * $FreeBSD: src/bin/sleep/sleep.c,v 1.9.2.1 2001/08/01 05:23:25 obrien Exp $
acea3a2a 36 * $DragonFly: src/bin/sleep/sleep.c,v 1.7 2005/02/27 15:57:15 liamfoy Exp $
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37 */
38
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39#include <ctype.h>
40#include <limits.h>
113f6df6 41#include <locale.h>
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42#include <stdio.h>
43#include <stdlib.h>
44#include <time.h>
45#include <unistd.h>
46
113f6df6 47static void usage(void);
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48
49int
b5744197 50main(int argc, char **argv)
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51{
52 struct timespec time_to_sleep;
53 long l;
54 int ch, neg;
55 char *p;
56
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57 setlocale(LC_ALL, "");
58
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59 while ((ch = getopt(argc, argv, "")) != -1)
60 switch(ch) {
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61 default:
62 usage();
63 /* NOTREACHED */
64 }
65 argc -= optind;
66 argv += optind;
67
68 if (argc != 1) {
69 usage();
70 /* NOTREACHED */
71 }
72
73 p = argv[0];
74
75 /* Skip over leading whitespaces. */
113f6df6 76 while (isspace(*p))
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77 ++p;
78
79 /* Check for optional `+' or `-' sign. */
80 neg = 0;
81 if (*p == '-') {
82 neg = 1;
83 ++p;
84 }
85 else if (*p == '+')
86 ++p;
87
88 /* Calculate seconds. */
113f6df6 89 if (isdigit(*p)) {
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90 l = strtol(p, &p, 10);
91 if (l > INT_MAX) {
92 /*
93 * Avoid overflow when `seconds' is huge. This assumes
acea3a2a 94 * that the maximum value for a time_t is <= INT_MAX.
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95 */
96 l = INT_MAX;
97 }
98 } else
99 l = 0;
100 time_to_sleep.tv_sec = (time_t)l;
101
102 /* Calculate nanoseconds. */
103 time_to_sleep.tv_nsec = 0;
104
105 if (*p == '.') { /* Decimal point. */
106 l = 100000000L;
107 do {
113f6df6 108 if (isdigit(*++p))
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109 time_to_sleep.tv_nsec += (*p - '0') * l;
110 else
111 break;
112 } while (l /= 10);
113 }
114
115 if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
2038fb68 116 nanosleep(&time_to_sleep, NULL);
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117
118 exit(0);
119}
120
113f6df6 121static void
b5744197 122usage(void)
984263bc 123{
57fed2af 124 fprintf(stderr, "usage: sleep seconds\n");
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125 exit(1);
126}