time/test_time.c

   1 /* Copyright (C) 1991-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <time.h>
  21
  22
  23 int
  24 main (int argc, char **argv)
  25 {
  26   time_t t;
  27   struct tm *tp;
  28   struct tm tbuf;
  29   int lose = 0;
  30
  31   --argc;
  32   ++argv;
  33
  34   do
  35     {
  36       char buf[BUFSIZ];
  37       if (argc > 0)
  38         {
  39           static char buf[BUFSIZ];
  40           sprintf(buf, "TZ=%s", *argv);
  41           if (putenv(buf))
  42             {
  43               puts("putenv failed.");
  44               lose = 1;
  45             }
  46           else
  47             puts (buf);
  48         }
  49       tzset();
  50       tbuf.tm_year = 72;
  51       tbuf.tm_mon = 0;
  52       tbuf.tm_mday = 31;
  53       tbuf.tm_hour = 6;
  54       tbuf.tm_min = 14;
  55       tbuf.tm_sec = 50;
  56       tbuf.tm_isdst = -1;
  57     doit:;
  58       t = mktime(&tbuf);
  59       if (t == (time_t) -1)
  60         {
  61           puts("mktime() failed?");
  62           lose = 1;
  63         }
  64       tp = localtime(&t);
  65       if (tp == NULL)
  66         {
  67           puts("localtime() failed.");
  68           lose = 1;
  69         }
  70       else if (strftime (buf, sizeof (buf), "%a %b %d %X %Z %Y", tp) == 0)
  71         {
  72           puts("strftime() failed.");
  73           lose = 1;
  74         }
  75       else
  76         puts(buf);
  77       if (tbuf.tm_year == 101)
  78         {
  79           tbuf.tm_year = 97;
  80           tbuf.tm_mon = 0;
  81           goto doit;
  82         }
  83       ++argv;
  84     } while (--argc > 0);
  85
  86   {
  87 #define SIZE    256
  88     char buffer[SIZE];
  89     time_t curtime;
  90     struct tm *loctime;
  91
  92     curtime = time (NULL);
  93
  94     loctime = localtime (&curtime);
  95
  96     fputs (asctime (loctime), stdout);
  97
  98     strftime (buffer, SIZE, "Today is %A, %B %d.\n", loctime);
  99     fputs (buffer, stdout);
 100     strftime (buffer, SIZE, "The time is %I:%M %p.\n", loctime);
 101     fputs (buffer, stdout);
 102
 103     loctime->tm_year = 72;
 104     loctime->tm_mon = 8;
 105     loctime->tm_mday = 12;
 106     loctime->tm_hour = 20;
 107     loctime->tm_min = 49;
 108     loctime->tm_sec = 05;
 109     curtime = mktime (loctime);
 110     strftime (buffer, SIZE, "%D %T was %w the %jth.\n", loctime);
 111     fputs (buffer, stdout);
 112   }
 113
 114   return (lose ? EXIT_FAILURE : EXIT_SUCCESS);
 115 }