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-rw-r--r--src/sleep.c146
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diff --git a/src/sleep.c b/src/sleep.c
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+/* sleep - delay for a specified amount of time.
+ Copyright (C) 1984-2022 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include "system.h"
+#include "cl-strtod.h"
+#include "die.h"
+#include "error.h"
+#include "long-options.h"
+#include "quote.h"
+#include "xnanosleep.h"
+#include "xstrtod.h"
+
+/* The official name of this program (e.g., no 'g' prefix). */
+#define PROGRAM_NAME "sleep"
+
+#define AUTHORS \
+ proper_name ("Jim Meyering"), \
+ proper_name ("Paul Eggert")
+
+void
+usage (int status)
+{
+ if (status != EXIT_SUCCESS)
+ emit_try_help ();
+ else
+ {
+ printf (_("\
+Usage: %s NUMBER[SUFFIX]...\n\
+ or: %s OPTION\n\
+Pause for NUMBER seconds. SUFFIX may be 's' for seconds (the default),\n\
+'m' for minutes, 'h' for hours or 'd' for days. NUMBER need not be an\n\
+integer. Given two or more arguments, pause for the amount of time\n\
+specified by the sum of their values.\n\
+\n\
+"),
+ program_name, program_name);
+ fputs (HELP_OPTION_DESCRIPTION, stdout);
+ fputs (VERSION_OPTION_DESCRIPTION, stdout);
+ emit_ancillary_info (PROGRAM_NAME);
+ }
+ exit (status);
+}
+
+/* Given a floating point value *X, and a suffix character, SUFFIX_CHAR,
+ scale *X by the multiplier implied by SUFFIX_CHAR. SUFFIX_CHAR may
+ be the NUL byte or 's' to denote seconds, 'm' for minutes, 'h' for
+ hours, or 'd' for days. If SUFFIX_CHAR is invalid, don't modify *X
+ and return false. Otherwise return true. */
+
+static bool
+apply_suffix (double *x, char suffix_char)
+{
+ int multiplier;
+
+ switch (suffix_char)
+ {
+ case 0:
+ case 's':
+ multiplier = 1;
+ break;
+ case 'm':
+ multiplier = 60;
+ break;
+ case 'h':
+ multiplier = 60 * 60;
+ break;
+ case 'd':
+ multiplier = 60 * 60 * 24;
+ break;
+ default:
+ return false;
+ }
+
+ *x *= multiplier;
+
+ return true;
+}
+
+int
+main (int argc, char **argv)
+{
+ double seconds = 0.0;
+ bool ok = true;
+
+ initialize_main (&argc, &argv);
+ set_program_name (argv[0]);
+ setlocale (LC_ALL, "");
+ bindtextdomain (PACKAGE, LOCALEDIR);
+ textdomain (PACKAGE);
+
+ atexit (close_stdout);
+
+ parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
+ Version, true, usage, AUTHORS,
+ (char const *) NULL);
+
+ if (argc == 1)
+ {
+ error (0, 0, _("missing operand"));
+ usage (EXIT_FAILURE);
+ }
+
+ for (int i = optind; i < argc; i++)
+ {
+ double s;
+ char const *p;
+ if (! (xstrtod (argv[i], &p, &s, cl_strtod) || errno == ERANGE)
+ /* Nonnegative interval. */
+ || ! (0 <= s)
+ /* No extra chars after the number and an optional s,m,h,d char. */
+ || (*p && *(p + 1))
+ /* Check any suffix char and update S based on the suffix. */
+ || ! apply_suffix (&s, *p))
+ {
+ error (0, 0, _("invalid time interval %s"), quote (argv[i]));
+ ok = false;
+ }
+
+ seconds += s;
+ }
+
+ if (!ok)
+ usage (EXIT_FAILURE);
+
+ if (xnanosleep (seconds))
+ die (EXIT_FAILURE, errno, _("cannot read realtime clock"));
+
+ return EXIT_SUCCESS;
+}