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984263bc MD |
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. | |
dc71b7ab | 13 | * 3. Neither the name of the University nor the names of its contributors |
984263bc MD |
14 | * may be used to endorse or promote products derived from this software |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
1de703da MD |
28 | * |
29 | * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. | |
30 | * @(#)sleep.c 8.3 (Berkeley) 4/2/94 | |
31 | * $FreeBSD: src/bin/sleep/sleep.c,v 1.9.2.1 2001/08/01 05:23:25 obrien Exp $ | |
acea3a2a | 32 | * $DragonFly: src/bin/sleep/sleep.c,v 1.7 2005/02/27 15:57:15 liamfoy Exp $ |
984263bc MD |
33 | */ |
34 | ||
984263bc MD |
35 | #include <ctype.h> |
36 | #include <limits.h> | |
113f6df6 | 37 | #include <locale.h> |
984263bc MD |
38 | #include <stdio.h> |
39 | #include <stdlib.h> | |
40 | #include <time.h> | |
41 | #include <unistd.h> | |
42 | ||
113f6df6 | 43 | static void usage(void); |
984263bc MD |
44 | |
45 | int | |
b5744197 | 46 | main(int argc, char **argv) |
984263bc MD |
47 | { |
48 | struct timespec time_to_sleep; | |
49 | long l; | |
50 | int ch, neg; | |
51 | char *p; | |
52 | ||
113f6df6 LF |
53 | setlocale(LC_ALL, ""); |
54 | ||
984263bc MD |
55 | while ((ch = getopt(argc, argv, "")) != -1) |
56 | switch(ch) { | |
984263bc MD |
57 | default: |
58 | usage(); | |
59 | /* NOTREACHED */ | |
60 | } | |
61 | argc -= optind; | |
62 | argv += optind; | |
63 | ||
64 | if (argc != 1) { | |
65 | usage(); | |
66 | /* NOTREACHED */ | |
67 | } | |
68 | ||
69 | p = argv[0]; | |
70 | ||
71 | /* Skip over leading whitespaces. */ | |
113f6df6 | 72 | while (isspace(*p)) |
984263bc MD |
73 | ++p; |
74 | ||
75 | /* Check for optional `+' or `-' sign. */ | |
76 | neg = 0; | |
77 | if (*p == '-') { | |
78 | neg = 1; | |
79 | ++p; | |
80 | } | |
81 | else if (*p == '+') | |
82 | ++p; | |
83 | ||
84 | /* Calculate seconds. */ | |
113f6df6 | 85 | if (isdigit(*p)) { |
984263bc MD |
86 | l = strtol(p, &p, 10); |
87 | if (l > INT_MAX) { | |
88 | /* | |
89 | * Avoid overflow when `seconds' is huge. This assumes | |
acea3a2a | 90 | * that the maximum value for a time_t is <= INT_MAX. |
984263bc MD |
91 | */ |
92 | l = INT_MAX; | |
93 | } | |
94 | } else | |
95 | l = 0; | |
96 | time_to_sleep.tv_sec = (time_t)l; | |
97 | ||
98 | /* Calculate nanoseconds. */ | |
99 | time_to_sleep.tv_nsec = 0; | |
100 | ||
101 | if (*p == '.') { /* Decimal point. */ | |
102 | l = 100000000L; | |
103 | do { | |
113f6df6 | 104 | if (isdigit(*++p)) |
984263bc MD |
105 | time_to_sleep.tv_nsec += (*p - '0') * l; |
106 | else | |
107 | break; | |
108 | } while (l /= 10); | |
109 | } | |
110 | ||
111 | if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0)) | |
2038fb68 | 112 | nanosleep(&time_to_sleep, NULL); |
984263bc MD |
113 | |
114 | exit(0); | |
115 | } | |
116 | ||
113f6df6 | 117 | static void |
b5744197 | 118 | usage(void) |
984263bc | 119 | { |
57fed2af | 120 | fprintf(stderr, "usage: sleep seconds\n"); |
984263bc MD |
121 | exit(1); |
122 | } |