1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* Alignment/padding coverage test for string comparison.
Copyright (C) 2016-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* This performs test comparisons with various (mis)alignments and
characters in the padding. It is partly a regression test for bug
20327. */
#include <limits.h>
#include <malloc.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <libc-diag.h>
static int
signum (int val)
{
if (val < 0)
return -1;
if (val > 0)
return 1;
else
return 0;
}
static size_t
max_size_t (size_t left, size_t right)
{
if (left > right)
return left;
else
return right;
}
/* Wrappers for strncmp and strncasecmp which determine the maximum
string length in some, either based on the input string length, or
using fixed constants. */
static int
strncmp_no_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncmp (left, right, max_size_t (left_len, right_len));
}
static int
strncasecmp_no_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncasecmp (left, right, max_size_t (left_len, right_len));
}
static int
strncmp_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncmp (left, right, max_size_t (left_len, right_len));
}
static int
strncasecmp_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncasecmp (left, right, max_size_t (left_len, right_len));
}
static int
strncmp_64 (const char *left, const char *right)
{
return strncmp (left, right, 64);
}
static int
strncasecmp_64 (const char *left, const char *right)
{
return strncasecmp (left, right, 64);
}
static int
strncmp_max (const char *left, const char *right)
{
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
/* GCC 9 warns about the size passed to strncmp being larger than
PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
DIAG_IGNORE_NEEDS_COMMENT (9, "-Wstringop-overflow=");
#endif
return strncmp (left, right, SIZE_MAX);
DIAG_POP_NEEDS_COMMENT;
}
static int
strncasecmp_max (const char *left, const char *right)
{
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
/* GCC 9 warns about the size passed to strncasecmp being larger
than PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
DIAG_IGNORE_NEEDS_COMMENT (9, "-Wstringop-overflow=");
#endif
return strncasecmp (left, right, SIZE_MAX);
DIAG_POP_NEEDS_COMMENT;
}
int
do_test (void)
{
enum {
max_align = 64,
max_string_length = 33
};
size_t blob_size = max_align + max_string_length + 1;
char *left = memalign (max_align, blob_size);
char *right = memalign (max_align, blob_size);
if (left == NULL || right == NULL)
{
printf ("error: out of memory\n");
return 1;
}
const struct
{
const char *name;
int (*implementation) (const char *, const char *);
} functions[] =
{
{ "strcmp", strcmp },
{ "strcasecmp", strcasecmp },
{ "strncmp (without NUL)", strncmp_no_terminator},
{ "strncasecmp (without NUL)", strncasecmp_no_terminator},
{ "strncmp (with NUL)", strncmp_terminator},
{ "strncasecmp (with NUL)", strncasecmp_terminator},
{ "strncmp (length 64)", strncmp_64},
{ "strncasecmp (length 64)", strncasecmp_64},
{ "strncmp (length SIZE_MAX)", strncmp_max},
{ "strncasecmp (length SIZE_MAX)", strncasecmp_max},
{ NULL, NULL }
};
const char *const strings[] =
{
"",
"0",
"01",
"01234567",
"0123456789abcde",
"0123456789abcdef",
"0123456789abcdefg",
"1",
"10",
"123456789abcdef",
"123456789abcdefg",
"23456789abcdef",
"23456789abcdefg",
"abcdefghijklmnopqrstuvwxyzABCDEF",
NULL
};
const unsigned char pads[] =
{ 0, 1, 32, 64, 128, '0', '1', 'e', 'f', 'g', 127, 192, 255 };
bool errors = false;
for (int left_idx = 0; strings[left_idx] != NULL; ++left_idx)
for (int left_align = 0; left_align < max_align; ++left_align)
for (unsigned pad_left = 0; pad_left < sizeof (pads); ++pad_left)
{
memset (left, pads[pad_left], blob_size);
strcpy (left + left_align, strings[left_idx]);
for (int right_idx = 0; strings[right_idx] != NULL; ++right_idx)
for (unsigned pad_right = 0; pad_right < sizeof (pads);
++pad_right)
for (int right_align = 0; right_align < max_align;
++right_align)
{
memset (right, pads[pad_right], blob_size);
strcpy (right + right_align, strings[right_idx]);
for (int func = 0; functions[func].name != NULL; ++func)
{
int expected = left_idx - right_idx;
int actual = functions[func].implementation
(left + left_align, right + right_align);
if (signum (actual) != signum (expected))
{
printf ("error: mismatch for %s: %d\n"
" left: \"%s\"\n"
" right: \"%s\"\n"
" pad_left = %u, pad_right = %u,\n"
" left_align = %d, right_align = %d\n",
functions[func].name, actual,
strings[left_idx], strings[right_idx],
pad_left, pad_right,
left_align, right_align);
errors = true;
}
}
}
}
free (right);
free (left);
return errors;
}
/* The nested loops need a long time to complete on slower
machines. */
#define TIMEOUT 600
#include <support/test-driver.c>
|
