forked from danmar/cppcheck
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtestcharvar.cpp
More file actions
233 lines (200 loc) · 6.67 KB
/
testcharvar.cpp
File metadata and controls
233 lines (200 loc) · 6.67 KB
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
228
229
230
231
232
233
/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2015 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "tokenize.h"
#include "checkother.h"
#include "testsuite.h"
class TestCharVar : public TestFixture {
public:
TestCharVar() : TestFixture("TestCharVar") {
}
private:
void run() {
TEST_CASE(array_index_1);
TEST_CASE(array_index_2);
TEST_CASE(array_index_3);
TEST_CASE(bitop1);
TEST_CASE(bitop2);
TEST_CASE(bitop3);
TEST_CASE(bitop4); // (long)&c
TEST_CASE(return1);
TEST_CASE(assignChar);
TEST_CASE(and03);
TEST_CASE(pointer);
}
void check(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("warning");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check char variable usage..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkCharVariable();
}
void array_index_1() {
check("int buf[256];\n"
"void foo()\n"
"{\n"
" unsigned char ch = 0x80;\n"
" buf[ch] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int buf[256];\n"
"void foo()\n"
"{\n"
" char ch = 0x80;\n"
" buf[ch] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Signed 'char' type used as array index.\n", errout.str());
check("int buf[256];\n"
"void foo()\n"
"{\n"
" signed char ch = 0x80;\n"
" buf[ch] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Signed 'char' type used as array index.\n", errout.str());
check("int buf[256];\n"
"void foo(char ch)\n"
"{\n"
" buf[ch] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Signed 'char' type used as array index.\n", errout.str());
check("void foo(const char str[])\n"
"{\n"
" map[str] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_2() {
// #3282 - False positive
check("void foo(char i);\n"
"void bar(int i) {\n"
" const char *s = \"abcde\";\n"
" foo(s[i]);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_3() {
// only write error message when array is more than
// 0x80 elements in size. Otherwise the full valid
// range is accessible with a char.
check("char buf[0x81];\n"
"void bar(char c) {\n"
" buf[c] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Signed 'char' type used as array index.\n", errout.str());
check("char buf[0x80];\n"
"void bar(char c) {\n"
" buf[c] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void bar(char c) {\n"
" buf[c] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void bitop1() {
check("void foo()\n"
"{\n"
" int result = 0;\n"
" char ch;\n"
" result = a | ch;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) When using 'char' variables in bit operations, sign extension can generate unexpected results.\n", errout.str());
}
void bitop2() {
check("void foo()\n"
"{\n"
" char ch;\n"
" func(&ch);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void bitop3() {
check("void f(int& i, char& c) {\n"
" i &= c;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) When using 'char' variables in bit operations, sign extension can generate unexpected results.\n", errout.str());
}
void bitop4() {
check("long f(char c) {\n"
" long a;\n"
" a = (long)&c;\n"
" return a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void return1() {
check("void foo()\n"
"{\n"
" char c;\n"
" return &c;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assignChar() {
check("void foo()\n"
"{\n"
" char c;\n"
" c = c & 0x123;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void and03() {
check("void foo()\n"
"{\n"
" char c;\n"
" int i = c & 0x03;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void pointer() {
// ticket #2866
check("void f(char *p) {\n"
" int ret = 0;\n"
" ret |= *p;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) When using 'char' variables in bit operations, sign extension can generate unexpected results.\n", errout.str());
// fixed code
check("void f(char *p) {\n"
" int ret = 0;\n"
" ret |= (unsigned char)*p;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3872 - false positive
check("int f(int *p) {\n"
" int ret = a();\n"
" ret |= *p;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3878 - false positive
check("int f(unsigned char *p) {\n"
" int ret = a();\n"
" ret |= *p;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestCharVar)