1 |
|
|
/* $OpenBSD: getenv.c,v 1.12 2016/03/13 18:34:21 guenther Exp $ */ |
2 |
|
|
/* |
3 |
|
|
* Copyright (c) 1987, 1993 |
4 |
|
|
* The Regents of the University of California. All rights reserved. |
5 |
|
|
* |
6 |
|
|
* Redistribution and use in source and binary forms, with or without |
7 |
|
|
* modification, are permitted provided that the following conditions |
8 |
|
|
* are met: |
9 |
|
|
* 1. Redistributions of source code must retain the above copyright |
10 |
|
|
* notice, this list of conditions and the following disclaimer. |
11 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
12 |
|
|
* notice, this list of conditions and the following disclaimer in the |
13 |
|
|
* documentation and/or other materials provided with the distribution. |
14 |
|
|
* 3. Neither the name of the University nor the names of its contributors |
15 |
|
|
* may be used to endorse or promote products derived from this software |
16 |
|
|
* without specific prior written permission. |
17 |
|
|
* |
18 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
19 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
20 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
21 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
22 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
23 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
24 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
25 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
26 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
27 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
28 |
|
|
* SUCH DAMAGE. |
29 |
|
|
*/ |
30 |
|
|
|
31 |
|
|
#include <stdlib.h> |
32 |
|
|
#include <string.h> |
33 |
|
|
|
34 |
|
|
|
35 |
|
|
/* |
36 |
|
|
* __findenv -- |
37 |
|
|
* Returns pointer to value associated with name, if any, else NULL. |
38 |
|
|
* Starts searching within the environmental array at offset. |
39 |
|
|
* Sets offset to be the offset of the name/value combination in the |
40 |
|
|
* environmental array, for use by putenv(3), setenv(3) and unsetenv(3). |
41 |
|
|
* Explicitly removes '=' in argument name. |
42 |
|
|
* |
43 |
|
|
* This routine *should* be a static; don't use it. |
44 |
|
|
*/ |
45 |
|
|
char * |
46 |
|
|
__findenv(const char *name, int len, int *offset) |
47 |
|
|
{ |
48 |
|
|
int i; |
49 |
|
|
const char *np; |
50 |
|
|
char **p, *cp; |
51 |
|
|
|
52 |
✗✓ |
9461486 |
if (name == NULL || environ == NULL) |
53 |
|
|
return (NULL); |
54 |
✓✓ |
240259702 |
for (p = environ + *offset; (cp = *p) != NULL; ++p) { |
55 |
✓✓✓✗
|
352155886 |
for (np = name, i = len; i && *cp; i--) |
56 |
✓✓ |
117384370 |
if (*cp++ != *np++) |
57 |
|
|
break; |
58 |
✓✓✓✗
|
115401884 |
if (i == 0 && *cp++ == '=') { |
59 |
|
1388 |
*offset = p - environ; |
60 |
|
1388 |
return (cp); |
61 |
|
|
} |
62 |
|
|
} |
63 |
|
4729355 |
return (NULL); |
64 |
|
4730743 |
} |
65 |
|
|
|
66 |
|
|
/* |
67 |
|
|
* getenv -- |
68 |
|
|
* Returns ptr to value associated with name, if any, else NULL. |
69 |
|
|
*/ |
70 |
|
|
char * |
71 |
|
|
getenv(const char *name) |
72 |
|
|
{ |
73 |
|
9461486 |
int offset = 0; |
74 |
|
|
const char *np; |
75 |
|
|
|
76 |
✓✓✓✗
|
189896378 |
for (np = name; *np && *np != '='; ++np) |
77 |
|
|
; |
78 |
|
9461486 |
return (__findenv(name, (int)(np - name), &offset)); |
79 |
|
4730743 |
} |
80 |
|
|
DEF_STRONG(getenv); |