tests/test-timespec.c

   1 /* Test timespec functions.
   2    Copyright 2015-2025 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 3 of the License, or
   7    (at your option) 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, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Paul Eggert.  */
  18
  19 #include <config.h>
  20
  21 #include "timespec.h"
  22
  23 #include "intprops.h"
  24 #include "macros.h"
  25
  26 #include <limits.h>
  27
  28 static struct { int s; int ns; } const prototype[] =
  29   {
  30     { INT_MIN, 0 },
  31     { INT_MIN, 1 },
  32     { INT_MIN, TIMESPEC_HZ - 1 },
  33     { INT_MIN + 1, 0 },
  34     { INT_MIN + 1, 1 },
  35     { INT_MIN + 1, TIMESPEC_HZ - 1 },
  36     { -1, 0 },
  37     { -1, 1 },
  38     { -1, TIMESPEC_HZ - 1 },
  39     { 0, 0 },
  40     { 0, 1 },
  41     { 0, TIMESPEC_HZ - 1 },
  42     { 1, 0 },
  43     { 1, 1 },
  44     { 1, TIMESPEC_HZ - 1 },
  45     { 1234567890, 0 },
  46     { 1234567890, 1 },
  47     { 1234567890, TIMESPEC_HZ - 1 },
  48     { INT_MAX - 1, 0 },
  49     { INT_MAX - 1, 1 },
  50     { INT_MAX - 1, TIMESPEC_HZ - 1 },
  51     { INT_MAX, 0 },
  52     { INT_MAX, 1 },
  53     { INT_MAX, TIMESPEC_HZ - 1 },
  54     { INT_MAX, 2 * TIMESPEC_HZ }
  55   };
  56 enum { nprototypes = sizeof prototype / sizeof *prototype };
  57
  58 static bool
  59 valid (struct timespec a)
  60 {
  61   return 0 <= a.tv_nsec && a.tv_nsec < TIMESPEC_HZ;
  62 }
  63
  64 static int
  65 sign (int i)
  66 {
  67   return i < 0 ? -1 : 0 < i;
  68 }
  69
  70 static int
  71 cmp (struct timespec a, struct timespec b)
  72 {
  73   return sign (timespec_cmp (a, b));
  74 }
  75
  76 static bool
  77 eq (struct timespec a, struct timespec b)
  78 {
  79   return timespec_cmp (a, b) == 0;
  80 }
  81
  82 static bool
  83 extremal (struct timespec a)
  84 {
  85   return ((a.tv_sec == TYPE_MINIMUM (time_t) && a.tv_nsec == 0)
  86           || (a.tv_sec == TYPE_MAXIMUM (time_t)
  87               && a.tv_nsec == TIMESPEC_HZ - 1));
  88 }
  89
  90 int
  91 main (void)
  92 {
  93   int i, j, k;
  94   struct timespec test[nprototypes + 1];
  95   int ntests;
  96   int computed_hz = 1;
  97   struct timespec prevroundtrip;
  98
  99   test[0] = make_timespec (TYPE_MINIMUM (time_t), -1);
 100   ntests = 1;
 101   for (i = 0; i < nprototypes; i++)
 102     {
 103       int s = prototype[i].s;
 104       if (TYPE_SIGNED (time_t) || 0 <= s)
 105         {
 106           time_t t = (s <= INT_MIN + 1 ? s - INT_MIN + TYPE_MINIMUM (time_t)
 107                       : INT_MAX - 1 <= s ? s - INT_MAX + TYPE_MAXIMUM (time_t)
 108                       : s);
 109           test[ntests++] = make_timespec (t, prototype[i].ns);
 110         }
 111     }
 112
 113   for (i = 0; i < LOG10_TIMESPEC_HZ; i++)
 114     computed_hz *= 10;
 115   ASSERT (computed_hz == TIMESPEC_HZ);
 116
 117   for (i = 0; i < ntests; i++)
 118     {
 119       struct timespec a = test[i];
 120
 121       struct timespec roundtrip = dtotimespec (timespectod (a));
 122       if (i != 0)
 123         ASSERT (cmp (prevroundtrip, roundtrip) <= 0);
 124       prevroundtrip = roundtrip;
 125
 126       ASSERT (sign (timespec_sign (a)) == cmp (a, make_timespec (0, 0)));
 127
 128       if (valid (a))
 129         for (j = 0; j < ntests; j++)
 130           {
 131             struct timespec b = test[j];
 132             if (valid (b))
 133               {
 134                 struct timespec sum = timespec_add (a, b);
 135                 struct timespec diff = timespec_sub (a, b);
 136                 struct timespec rdiff = timespec_sub (b, a);
 137                 ASSERT (cmp (a, b) == sign (i - j));
 138                 ASSERT (eq (sum, timespec_add (b, a)));
 139                 if (! extremal (sum))
 140                   {
 141                     ASSERT (eq (a, timespec_sub (sum, b)));
 142                     ASSERT (eq (b, timespec_sub (sum, a)));
 143
 144                     for (k = 0; k < ntests; k++)
 145                       {
 146                         struct timespec c = test[k];
 147                         if (valid (c))
 148                           {
 149                             struct timespec sumbc = timespec_add (b, c);
 150                             if (! extremal (sumbc))
 151                               ASSERT (eq (timespec_add (a, sumbc),
 152                                           timespec_add (sum, c)));
 153                           }
 154                       }
 155                   }
 156                 if (! extremal (diff))
 157                   ASSERT (eq (a, timespec_add (diff, b)));
 158                 if (! extremal (rdiff))
 159                   ASSERT (eq (b, timespec_add (rdiff, a)));
 160
 161               }
 162           }
 163     }
 164
 165   return test_exit_status;
 166 }