root / prex-0.9.0 / usr / test / environ / environ.c @ 03e9c04a
History | View | Annotate | Download (2.77 KB)
1 |
/*-
|
---|---|
2 |
* Copyright (c) 2009, Kohsuke Ohtani
|
3 |
* All rights reserved.
|
4 |
*
|
5 |
* Redistribution and use in source and binary forms, with or without
|
6 |
* modification, are permitted provided that the following conditions
|
7 |
* are met:
|
8 |
* 1. Redistributions of source code must retain the above copyright
|
9 |
* notice, this list of conditions and the following disclaimer.
|
10 |
* 2. Redistributions in binary form must reproduce the above copyright
|
11 |
* notice, this list of conditions and the following disclaimer in the
|
12 |
* documentation and/or other materials provided with the distribution.
|
13 |
* 3. Neither the name of the author nor the names of any co-contributors
|
14 |
* may be used to endorse or promote products derived from this software
|
15 |
* without specific prior written permission.
|
16 |
*
|
17 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
18 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
19 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
20 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
21 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
22 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
23 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
24 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
26 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
27 |
* SUCH DAMAGE.
|
28 |
*/
|
29 |
|
30 |
/*
|
31 |
* environ.c - test POSIX environment variable
|
32 |
*/
|
33 |
|
34 |
#include <stdio.h> |
35 |
#include <stdlib.h> |
36 |
#include <unistd.h> |
37 |
|
38 |
extern char **environ; |
39 |
|
40 |
static void |
41 |
oops(void)
|
42 |
{ |
43 |
printf("oops!\n");
|
44 |
exit(1);
|
45 |
} |
46 |
|
47 |
static void |
48 |
show_env(void)
|
49 |
{ |
50 |
char **envp = environ;
|
51 |
int i;
|
52 |
|
53 |
for (i = 0; envp[i] != NULL; i++) { |
54 |
printf("envp[%d]: %s\n", i, envp[i]);
|
55 |
} |
56 |
} |
57 |
|
58 |
int
|
59 |
main(int argc, char *argv[]) |
60 |
{ |
61 |
char *val;
|
62 |
|
63 |
printf("test environment variables\n");
|
64 |
|
65 |
/* Show environment passed by shell */
|
66 |
printf("show env\n");
|
67 |
show_env(); |
68 |
|
69 |
/* Set new viriable */
|
70 |
printf("setenv-1\n");
|
71 |
setenv("PATH", "/boot", 1); |
72 |
show_env(); |
73 |
|
74 |
/* Overwirte existing viriable */
|
75 |
printf("setenv-2\n");
|
76 |
setenv("PATH", "/boot:/bin", 1); |
77 |
show_env(); |
78 |
|
79 |
/* No overwirte please... */
|
80 |
printf("setenv-3\n");
|
81 |
setenv("PATH", "/boot", 0); |
82 |
show_env(); |
83 |
|
84 |
/* No overwirte please... */
|
85 |
printf("setenv-4\n");
|
86 |
setenv("PATH", "/boot", 0); |
87 |
show_env(); |
88 |
|
89 |
/* Get non existing variable */
|
90 |
printf("getenv-1\n");
|
91 |
val = getenv("TMP");
|
92 |
if (val != NULL) |
93 |
oops(); |
94 |
|
95 |
/* Get existing variable */
|
96 |
printf("getenv-2\n");
|
97 |
val = getenv("PATH");
|
98 |
if (val == NULL) |
99 |
oops(); |
100 |
printf("PATH=%s\n", val);
|
101 |
|
102 |
/* putenv */
|
103 |
printf("putenv-1\n");
|
104 |
putenv("TMP=/tmp");
|
105 |
show_env(); |
106 |
|
107 |
printf("putenv-2\n");
|
108 |
putenv("ABC=/abc");
|
109 |
show_env(); |
110 |
|
111 |
exit(0);
|
112 |
} |