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
|
/* Copyright (C) 1999-2013 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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define VAR "FOOBAR"
char putenv_val[100] = VAR "=some longer value";
int
main (void)
{
int result = 0;
const char *valp;
/* First test: remove entry FOOBAR, whether it exists or not. */
unsetenv (VAR);
/* Now getting the value should fail. */
if (getenv (VAR) != NULL)
{
printf ("There should be no `%s' value\n", VAR);
result = 1;
}
/* Now add a value, with the replace flag cleared. */
if (setenv (VAR, "one", 0) != 0)
{
printf ("setenv #1 failed: %m\n");
result = 1;
}
/* Getting this value should now be possible. */
valp = getenv (VAR);
if (valp == NULL || strcmp (valp, "one") != 0)
{
puts ("getenv #2 failed");
result = 1;
}
/* Try to replace without the replace flag set. This should fail. */
if (setenv (VAR, "two", 0) != 0)
{
printf ("setenv #2 failed: %m\n");
result = 1;
}
/* The value shouldn't have changed. */
valp = getenv (VAR);
if (valp == NULL || strcmp (valp, "one") != 0)
{
puts ("getenv #3 failed");
result = 1;
}
/* Now replace the value using putenv. */
if (putenv (putenv_val) != 0)
{
printf ("putenv #1 failed: %m\n");
result = 1;
}
/* The value should have changed now. */
valp = getenv (VAR);
if (valp == NULL || strcmp (valp, "some longer value") != 0)
{
printf ("getenv #4 failed (is \"%s\")\n", valp);
result = 1;
}
/* Now one tricky check: changing the variable passed in putenv should
change the environment. */
strcpy (&putenv_val[sizeof VAR], "a short one");
/* The value should have changed again. */
valp = getenv (VAR);
if (valp == NULL || strcmp (valp, "a short one") != 0)
{
puts ("getenv #5 failed");
result = 1;
}
/* It should even be possible to rename the variable. */
strcpy (putenv_val, "XYZZY=some other value");
/* Now a lookup using the old name should fail. */
if (getenv (VAR) != NULL)
{
puts ("getenv #6 failed");
result = 1;
}
/* But using the new name it should work. */
valp = getenv ("XYZZY");
if (valp == NULL || strcmp (valp, "some other value") != 0)
{
puts ("getenv #7 failed");
result = 1;
}
/* Create a new variable with the old name. */
if (setenv (VAR, "a new value", 0) != 0)
{
printf ("setenv #3 failed: %m\n");
result = 1;
}
/* At this point a getenv call must return the new value. */
valp = getenv (VAR);
if (valp == NULL || strcmp (valp, "a new value") != 0)
{
puts ("getenv #8 failed");
result = 1;
}
/* Black magic: rename the variable we added using putenv back. */
strcpy (putenv_val, VAR "=old name new value");
/* This is interesting. We have two variables with the same name.
Getting a value should return one of them. */
valp = getenv (VAR);
if (valp == NULL
|| (strcmp (valp, "a new value") != 0
&& strcmp (valp, "old name new value") != 0))
{
puts ("getenv #9 failed");
result = 1;
}
/* More fun ahead: we are now removing the variable. This should remove
both values. The cast is ok: this call should never put the string
in the environment and it should never modify it. */
putenv ((char *) VAR);
/* Getting the value should now fail. */
if (getenv (VAR) != NULL)
{
printf ("getenv #10 failed (\"%s\" found)\n", getenv (VAR));
result = 1;
}
/* Now a test with an environment variable that's one character long.
This is to test a special case in the getenv implementation. */
strcpy (putenv_val, "X=one character test");
if (putenv (putenv_val) != 0)
{
printf ("putenv #2 failed: %m\n");
result = 1;
}
valp = getenv ("X");
if (valp == NULL || strcmp (valp, "one character test") != 0)
{
puts ("getenv #11 failed");
result = 1;
}
/* Both setenv and unsetenv should return -1/EINVAL for NULL or "" name
or if name contains '=' character. */
errno = 0;
if (setenv (NULL, "val", 1) >= 0 || errno != EINVAL)
{
puts ("setenv #4 failed");
result = 1;
}
errno = 0;
if (setenv ("", "val", 0) >= 0 || errno != EINVAL)
{
puts ("setenv #5 failed");
result = 1;
}
errno = 0;
if (setenv ("var=val", "val", 1) >= 0 || errno != EINVAL)
{
puts ("setenv #6 failed");
result = 1;
}
errno = 0;
if (unsetenv (NULL) >= 0 || errno != EINVAL)
{
puts ("unsetenv #1 failed");
result = 1;
}
errno = 0;
if (unsetenv ("") >= 0 || errno != EINVAL)
{
puts ("unsetenv #2 failed");
result = 1;
}
errno = 0;
if (unsetenv ("x=y") >= 0 || errno != EINVAL)
{
puts ("unsetenv #3 failed");
result = 1;
}
return result;
}
|
