1 files changed, 146 insertions, 0 deletions
diff --git a/src/sleep.c b/src/sleep.c
new file mode 100644
index 0000000..5f8656e
--- /dev/null
+++ b/src/sleep.c
@@ -0,0 +1,146 @@
+/* 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;
+}