1/* Copyright (C) 2012-2022 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
25static int
26do_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"
100

source code of glibc/stdio-common/tst-sprintf3.c