1 /* sleep - delay for a specified amount of time.
2 Copyright (C) 1984-2023 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #include <config.h>
18 #include <stdio.h>
19 #include <sys/types.h>
20
21 #include "system.h"
22 #include "cl-strtod.h"
23 #include "long-options.h"
24 #include "quote.h"
25 #include "xnanosleep.h"
26 #include "xstrtod.h"
27
28 /* The official name of this program (e.g., no 'g' prefix). */
29 #define PROGRAM_NAME "sleep"
30
31 #define AUTHORS \
32 proper_name ("Jim Meyering"), \
33 proper_name ("Paul Eggert")
34
35 void
usage(int status)36 usage (int status)
37 {
38 if (status != EXIT_SUCCESS)
39 emit_try_help ();
40 else
41 {
42 printf (_("\
43 Usage: %s NUMBER[SUFFIX]...\n\
44 or: %s OPTION\n\
45 Pause for NUMBER seconds. SUFFIX may be 's' for seconds (the default),\n\
46 'm' for minutes, 'h' for hours or 'd' for days. NUMBER need not be an\n\
47 integer. Given two or more arguments, pause for the amount of time\n\
48 specified by the sum of their values.\n\
49 \n\
50 "),
51 program_name, program_name);
52 fputs (HELP_OPTION_DESCRIPTION, stdout);
53 fputs (VERSION_OPTION_DESCRIPTION, stdout);
54 emit_ancillary_info (PROGRAM_NAME);
55 }
56 exit (status);
57 }
58
59 /* Given a floating point value *X, and a suffix character, SUFFIX_CHAR,
60 scale *X by the multiplier implied by SUFFIX_CHAR. SUFFIX_CHAR may
61 be the NUL byte or 's' to denote seconds, 'm' for minutes, 'h' for
62 hours, or 'd' for days. If SUFFIX_CHAR is invalid, don't modify *X
63 and return false. Otherwise return true. */
64
65 static bool
apply_suffix(double * x,char suffix_char)66 apply_suffix (double *x, char suffix_char)
67 {
68 int multiplier;
69
70 switch (suffix_char)
71 {
72 case 0:
73 case 's':
74 multiplier = 1;
75 break;
76 case 'm':
77 multiplier = 60;
78 break;
79 case 'h':
80 multiplier = 60 * 60;
81 break;
82 case 'd':
83 multiplier = 60 * 60 * 24;
84 break;
85 default:
86 return false;
87 }
88
89 *x *= multiplier;
90
91 return true;
92 }
93
94 int
main(int argc,char ** argv)95 main (int argc, char **argv)
96 {
97 double seconds = 0.0;
98 bool ok = true;
99
100 initialize_main (&argc, &argv);
101 set_program_name (argv[0]);
102 setlocale (LC_ALL, "");
103 bindtextdomain (PACKAGE, LOCALEDIR);
104 textdomain (PACKAGE);
105
106 atexit (close_stdout);
107
108 parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
109 Version, true, usage, AUTHORS,
110 (char const *) nullptr);
111
112 if (argc == 1)
113 {
114 error (0, 0, _("missing operand"));
115 usage (EXIT_FAILURE);
116 }
117
118 for (int i = optind; i < argc; i++)
119 {
120 double s;
121 char const *p;
122 if (! (xstrtod (argv[i], &p, &s, cl_strtod) || errno == ERANGE)
123 /* Nonnegative interval. */
124 || ! (0 <= s)
125 /* No extra chars after the number and an optional s,m,h,d char. */
126 || (*p && *(p + 1))
127 /* Check any suffix char and update S based on the suffix. */
128 || ! apply_suffix (&s, *p))
129 {
130 error (0, 0, _("invalid time interval %s"), quote (argv[i]));
131 ok = false;
132 }
133
134 seconds += s;
135 }
136
137 if (!ok)
138 usage (EXIT_FAILURE);
139
140 if (xnanosleep (seconds))
141 error (EXIT_FAILURE, errno, _("cannot read realtime clock"));
142
143 return EXIT_SUCCESS;
144 }
145