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8e93dc6297
* src/system.h (emit_ancillary_info): Take the invariant PROGRAM_NAME as a parameter, so that consistent references are made to online docs and texinfo nodes, when a --program-prefix is in place. Note the man pages don't need this fix as they're generated before the program prefix is used. * NEWS: Mention the improvements in references to online documentation.
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/* sleep - delay for a specified amount of time.
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Copyright (C) 1984-2014 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <getopt.h>
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#include "system.h"
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#include "c-strtod.h"
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#include "error.h"
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#include "long-options.h"
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#include "quote.h"
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#include "xnanosleep.h"
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#include "xstrtod.h"
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/* The official name of this program (e.g., no 'g' prefix). */
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#define PROGRAM_NAME "sleep"
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#define AUTHORS \
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proper_name ("Jim Meyering"), \
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proper_name ("Paul Eggert")
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void
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usage (int status)
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{
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if (status != EXIT_SUCCESS)
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emit_try_help ();
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else
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{
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printf (_("\
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Usage: %s NUMBER[SUFFIX]...\n\
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or: %s OPTION\n\
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Pause for NUMBER seconds. SUFFIX may be 's' for seconds (the default),\n\
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'm' for minutes, 'h' for hours or 'd' for days. Unlike most implementations\n\
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that require NUMBER be an integer, here NUMBER may be an arbitrary floating\n\
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point number. Given two or more arguments, pause for the amount of time\n\
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specified by the sum of their values.\n\
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\n\
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"),
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program_name, program_name);
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fputs (HELP_OPTION_DESCRIPTION, stdout);
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fputs (VERSION_OPTION_DESCRIPTION, stdout);
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emit_ancillary_info (PROGRAM_NAME);
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}
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exit (status);
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}
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/* Given a floating point value *X, and a suffix character, SUFFIX_CHAR,
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scale *X by the multiplier implied by SUFFIX_CHAR. SUFFIX_CHAR may
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be the NUL byte or 's' to denote seconds, 'm' for minutes, 'h' for
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hours, or 'd' for days. If SUFFIX_CHAR is invalid, don't modify *X
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and return false. Otherwise return true. */
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static bool
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apply_suffix (double *x, char suffix_char)
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{
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int multiplier;
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switch (suffix_char)
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{
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case 0:
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case 's':
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multiplier = 1;
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break;
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case 'm':
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multiplier = 60;
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break;
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case 'h':
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multiplier = 60 * 60;
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break;
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case 'd':
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multiplier = 60 * 60 * 24;
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break;
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default:
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return false;
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}
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*x *= multiplier;
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return true;
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}
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int
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main (int argc, char **argv)
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{
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int i;
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double seconds = 0.0;
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bool ok = true;
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initialize_main (&argc, &argv);
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set_program_name (argv[0]);
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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atexit (close_stdout);
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parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, Version,
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usage, AUTHORS, (char const *) NULL);
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if (getopt_long (argc, argv, "", NULL, NULL) != -1)
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usage (EXIT_FAILURE);
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if (argc == 1)
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{
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error (0, 0, _("missing operand"));
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usage (EXIT_FAILURE);
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}
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for (i = optind; i < argc; i++)
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{
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double s;
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const char *p;
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if (! xstrtod (argv[i], &p, &s, c_strtod)
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/* Nonnegative interval. */
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|| ! (0 <= s)
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/* No extra chars after the number and an optional s,m,h,d char. */
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|| (*p && *(p+1))
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/* Check any suffix char and update S based on the suffix. */
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|| ! apply_suffix (&s, *p))
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{
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error (0, 0, _("invalid time interval %s"), quote (argv[i]));
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ok = false;
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}
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seconds += s;
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}
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if (!ok)
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usage (EXIT_FAILURE);
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if (xnanosleep (seconds))
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error (EXIT_FAILURE, errno, _("cannot read realtime clock"));
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return EXIT_SUCCESS;
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}
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