about summary refs log tree commit diff
path: root/stdlib/tst-environ.c
blob: 01083f551182a5fe653941bb04ebca2f592b65d3 (plain) (blame)
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
#include <stdio.h>
#include <stdlib.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.  */
  putenv (VAR);

  /* Getting the value should now fail.  */
  if (getenv (VAR) != NULL)
    {
      printf ("getenv #10 failed (\"%s\" found)\n", getenv (VAR));
      result = 1;
    }

  return result;
}