stdio-common/tst-sprintf3.c

   1 /* Copyright (C) 2012-2020 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 /* Test bug #13941.  */
  19
  20 #include <float.h>
  21 #include <math.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 static int
  26 do_test (void)
  27 {
  28 #if LDBL_MANT_DIG >= 106
  29   volatile union { long double l; long long x[2]; } u, v;
  30   char buf[64];
  31 #endif
  32   int result = 0;
  33
  34 #if LDBL_MANT_DIG == 106 || LDBL_MANT_DIG == 113
  35 # define COMPARE_LDBL(u, v) \
  36   ((u).l == (v).l && (u).x[0] == (v).x[0] && (u).x[1] == (v).x[1])
  37 #else
  38 # define COMPARE_LDBL(u, v) ((u).l == (v).l)
  39 #endif
  40
  41 #define TEST_N(val, n) \
  42   do                                                                       \
  43     {                                                                      \
  44       u.l = (val);                                                         \
  45       snprintf (buf, sizeof buf, "%." #n "LgL", u.l);                      \
  46       if (strcmp (buf, #val) != 0)                                         \
  47         {                                                                  \
  48           printf ("Error on line %d: %s != %s\n", __LINE__, buf, #val);    \
  49           result = 1;                                                      \
  50         }                                                                  \
  51       if (sscanf (#val, "%Lg", &v.l) != 1 || !COMPARE_LDBL (u, v))         \
  52         {                                                                  \
  53           printf ("Error sscanf on line %d: %." #n "Lg != %." #n "Lg\n",   \
  54                   __LINE__, u.l, v.l);                                     \
  55           result = 1;                                                      \
  56         }                                                                  \
  57       /* printf ("%s %Lg %016Lx %016Lx\n", #val, u.l, u.x[0], u.x[1]); */  \
  58     }                                                                      \
  59   while (0)
  60
  61 #define TEST(val) TEST_N (val,30)
  62
  63 #if LDBL_MANT_DIG >= 106
  64 # if LDBL_MANT_DIG == 106
  65   TEST (2.22507385850719347803989925739e-308L);
  66   TEST (2.22507385850719397210554509863e-308L);
  67   TEST (2.22507385850720088902458687609e-308L);
  68
  69   /* Verify precision is not lost for long doubles
  70      of the form +1.pN,-1.pM.  */
  71   TEST_N (3.32306998946228968225951765070082e+35L, 34);
  72 # endif
  73   TEST (2.22507385850720138309023271733e-308L);
  74   TEST (2.22507385850720187715587855858e-308L);
  75   TEST (2.2250738585074419930597574044e-308L);
  76   TEST (4.45014771701440227211481959342e-308L);
  77   TEST (4.45014771701440276618046543466e-308L);
  78   TEST (4.45014771701440375431175711716e-308L);
  79   TEST (4.45014771701440474244304879965e-308L);
  80   TEST (7.12023634722304600689881138745e-307L);
  81   TEST (1.13923781555569064960474854133e-305L);
  82   TEST (1.13777777777777776389998996996L);
  83   TEST (1.13777777777777765287768750745L);
  84   TEST (20988295479420645138.2044444444L);
  85   TEST (20988295479420643090.2044444444L);
  86   TEST (2.14668699894294423266045294316e-292L);
  87 # if LDBL_MANT_DIG == 106
  88   TEST (-2.35993711055432139266626434123e-292L);
  89   TEST (6.26323524637968345414769634658e-302L);
  90   TEST (1.49327164802066885331814201989e-308L);
  91   TEST (3.71834550652787023640837473722e-308L);
  92   TEST (9.51896449671134907001349268087e-306L);
  93 # endif
  94 #endif
  95   return result;
  96 }
  97
  98 #define TEST_FUNCTION do_test ()
  99 #include "../test-skeleton.c"