1/* Basic test for the TEST_COMPARE macro.
2 Copyright (C) 2017-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <string.h>
20#include <support/check.h>
21#include <support/capture_subprocess.h>
22
23static void
24subprocess (void *closure)
25{
26 char ch = 1;
27 /* These tests should fail. */
28 TEST_COMPARE (ch, -1); /* Line 28. */
29 TEST_COMPARE (2LL, -2LL); /* Line 29. */
30 TEST_COMPARE (3LL, (short) -3); /* Line 30. */
31}
32
33struct bitfield
34{
35 int i2 : 2;
36 int i3 : 3;
37 unsigned int u2 : 2;
38 unsigned int u3 : 3;
39 int i31 : 31;
40 unsigned int u31 : 31 ;
41 long long int i63 : 63;
42 unsigned long long int u63 : 63;
43};
44
45/* Functions which return signed sizes are common, so test that these
46 results can readily checked using TEST_COMPARE. */
47
48static int
49return_ssize_t (void)
50{
51 return 4;
52}
53
54static int
55return_int (void)
56{
57 return 4;
58}
59
60
61static int
62do_test (void)
63{
64 /* This should succeed. */
65 TEST_COMPARE (1, 1);
66 TEST_COMPARE (2LL, 2U);
67 {
68 char i8 = 3;
69 unsigned short u16 = 3;
70 TEST_COMPARE (i8, u16);
71 }
72 TEST_COMPARE (return_ssize_t (), sizeof (char[4]));
73 TEST_COMPARE (return_int (), sizeof (char[4]));
74
75 struct bitfield bitfield = { 0 };
76 TEST_COMPARE (bitfield.i2, bitfield.i3);
77 TEST_COMPARE (bitfield.u2, bitfield.u3);
78 TEST_COMPARE (bitfield.u2, bitfield.i3);
79 TEST_COMPARE (bitfield.u3, bitfield.i3);
80 TEST_COMPARE (bitfield.i2, bitfield.u3);
81 TEST_COMPARE (bitfield.i3, bitfield.u2);
82 TEST_COMPARE (bitfield.i63, bitfield.i63);
83 TEST_COMPARE (bitfield.u63, bitfield.u63);
84 TEST_COMPARE (bitfield.i31, bitfield.i63);
85 TEST_COMPARE (bitfield.i63, bitfield.i31);
86
87 struct support_capture_subprocess proc = support_capture_subprocess
88 (callback: &subprocess, NULL);
89
90 /* Discard the reported error. */
91 support_record_failure_reset ();
92
93 puts (s: "info: *** subprocess output starts ***");
94 fputs (s: proc.out.buffer, stdout);
95 puts (s: "info: *** subprocess output ends ***");
96
97 TEST_VERIFY
98 (strcmp (proc.out.buffer,
99 "tst-test_compare.c:28: numeric comparison failure\n"
100 " left: 1 (0x1); from: ch\n"
101 " right: -1 (0xffffffff); from: -1\n"
102 "tst-test_compare.c:29: numeric comparison failure\n"
103 " left: 2 (0x2); from: 2LL\n"
104 " right: -2 (0xfffffffffffffffe); from: -2LL\n"
105 "tst-test_compare.c:30: numeric comparison failure"
106 " (widths 64 and 32)\n"
107 " left: 3 (0x3); from: 3LL\n"
108 " right: -3 (0xfffffffd); from: (short) -3\n") == 0);
109
110 /* Check that there is no output on standard error. */
111 support_capture_subprocess_check (&proc, context: "TEST_COMPARE", status_or_signal: 0, allowed: sc_allow_stdout);
112
113 return 0;
114}
115
116#include <support/test-driver.c>
117

source code of glibc/support/tst-test_compare.c