src/sleep.c

   1 /* sleep - delay for a specified amount of time.
   2    Copyright (C) 84, 91, 92, 93, 94, 1995 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 2, or (at your option)
   7    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, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 #include <config.h>
  19 #include <stdio.h>
  20 #include <sys/types.h>
  21 #include <getopt.h>
  22
  23 #include "version.h"
  24 #include "system.h"
  25 #include "error.h"
  26
  27 static long argdecode ();
  28
  29 /* The name by which this program was run. */
  30 char *program_name;
  31
  32 /* If non-zero, display usage information and exit.  */
  33 static int show_help;
  34
  35 /* If non-zero, print the version on standard output and exit.  */
  36 static int show_version;
  37
  38 static struct option const long_options[] =
  39 {
  40   {"help", no_argument, &show_help, 1},
  41   {"version", no_argument, &show_version, 1},
  42   {0, 0, 0, 0}
  43 };
  44
  45 static void
  46 usage (status)
  47      int status;
  48 {
  49   if (status != 0)
  50     fprintf (stderr, "Try `%s --help' for more information.\n",
  51              program_name);
  52   else
  53     {
  54       printf ("Usage: %s [OPTION]... NUMBER[SUFFIX]\n", program_name);
  55       printf ("\
  56 Pause for NUMBER seconds.\n\
  57 SUFFIX may be s to keep seconds, m for minutes, h for hours or d for days.\n\
  58 \n\
  59   --help      display this help and exit\n\
  60   --version   output version information and exit\n");
  61     }
  62   exit (status);
  63 }
  64
  65 void
  66 main (argc, argv)
  67      int argc;
  68      char **argv;
  69 {
  70   int i;
  71   unsigned seconds = 0;
  72   int c;
  73
  74   program_name = argv[0];
  75
  76   while ((c = getopt_long (argc, argv, "", long_options, (int *) 0)) != EOF)
  77     {
  78       switch (c)
  79         {
  80         case 0:
  81           break;
  82
  83         default:
  84           usage (1);
  85         }
  86     }
  87
  88   if (show_version)
  89     {
  90       printf ("sleep - %s\n", version_string);
  91       exit (0);
  92     }
  93
  94   if (show_help)
  95     usage (0);
  96
  97   if (argc == 1)
  98     {
  99       error (0, 0, "too few arguments");
 100       usage (1);
 101     }
 102
 103   for (i = 1; i < argc; i++)
 104     seconds += argdecode (argv[i]);
 105
 106   sleep (seconds);
 107
 108   exit (0);
 109 }
 110
 111 static long
 112 argdecode (s)
 113      char *s;
 114 {
 115   long value;
 116   register char *p = s;
 117   register char c;
 118
 119   value = 0;
 120   while ((c = *p++) >= '0' && c <= '9')
 121     value = value * 10 + c - '0';
 122
 123   switch (c)
 124     {
 125     case 's':
 126       break;
 127     case 'm':
 128       value *= 60;
 129       break;
 130     case 'h':
 131       value *= 60 * 60;
 132       break;
 133     case 'd':
 134       value *= 60 * 60 * 24;
 135       break;
 136     default:
 137       p--;
 138     }
 139
 140   if (*p)
 141     error (1, 0, "invalid time interval `%s'", s);
 142   return value;
 143 }