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Diffstat (limited to 'src/sleep.c')
| -rw-r--r-- | src/sleep.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/sleep.c b/src/sleep.c new file mode 100644 index 0000000..730b19d --- /dev/null +++ b/src/sleep.c @@ -0,0 +1,152 @@ +/* sleep - delay for a specified amount of time. + Copyright (C) 84, 1991-1997, 1999-2005 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 2, 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, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include <config.h> +#include <stdio.h> +#include <sys/types.h> +#include <getopt.h> + +#include "system.h" +#include "c-strtod.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 "Jim Meyering", "Paul Eggert" + +/* The name by which this program was run. */ +char *program_name; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + 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. Unlike most implementations\n\ +that require NUMBER be an integer, here NUMBER may be an arbitrary floating\n\ +point number. 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); + printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); + } + 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) +{ + int i; + double seconds = 0.0; + bool ok = true; + + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION, + usage, AUTHORS, (char const *) NULL); + if (getopt_long (argc, argv, "", NULL, NULL) != -1) + usage (EXIT_FAILURE); + + if (argc == 1) + { + error (0, 0, _("missing operand")); + usage (EXIT_FAILURE); + } + + for (i = optind; i < argc; i++) + { + double s; + const char *p; + if (! xstrtod (argv[i], &p, &s, c_strtod) + /* 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)) + error (EXIT_FAILURE, errno, _("cannot read realtime clock")); + + exit (EXIT_SUCCESS); +} |