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
|
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include <stdio.h>
#include <io.h>
#include <direct.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include "evil_private.h"
/*
* Environment variable related functions
*
* int setenv (const char *name, const char *value, int overwrite);
* void unsetenv (const char *name);
*
*/
EVIL_API int
setenv(const char *name,
const char *value,
int overwrite)
{
char *old_name;
char *str;
size_t length;
int res;
if (!name || !*name)
return -1;
/* if '=' is found, return EINVAL */
if (strchr (name, '='))
{
errno = EINVAL;
return -1;
}
/* if name is already set and overwrite is 0, we exit with success */
old_name = getenv(name);
if (!overwrite && old_name)
return 0;
length = value ? strlen(value) : 0;
length += strlen(name) + 2;
str = (char *)malloc(length);
if (!str)
{
errno = ENOMEM;
return -1;
}
if (!value)
sprintf(str, "%s=", name);
else
sprintf(str, "%s=%s", name, value);
res = _putenv(str);
free(str);
return res;
}
EVIL_API int
unsetenv(const char *name)
{
return setenv(name, NULL, 1);
}
/*
* Files related functions
*
*/
EVIL_API char *
realpath(const char *file_name, char *resolved_name)
{
char *retname = NULL; /* we will return this, if we fail */
/* SUSv3 says we must set `errno = EINVAL', and return NULL,
* if `name' is passed as a NULL pointer.
*/
if (file_name == NULL)
errno = EINVAL;
/* Otherwise, `name' must refer to a readable filesystem object,
* if we are going to resolve its absolute path name.
*/
else if (access(file_name, 4) == 0)
{
/* If `name' didn't point to an existing entity,
* then we don't get to here; we simply fall past this block,
* returning NULL, with `errno' appropriately set by `access'.
*
* When we _do_ get to here, then we can use `_fullpath' to
* resolve the full path for `name' into `resolved', but first,
* check that we have a suitable buffer, in which to return it.
*/
if ((retname = resolved_name) == NULL)
{
/* Caller didn't give us a buffer, so we'll exercise the
* option granted by SUSv3, and allocate one.
*
* `_fullpath' would do this for us, but it uses `malloc', and
* Microsoft's implementation doesn't set `errno' on failure.
* If we don't do this explicitly ourselves, then we will not
* know if `_fullpath' fails on `malloc' failure, or for some
* other reason, and we want to set `errno = ENOMEM' for the
* `malloc' failure case.
*/
retname = malloc(_MAX_PATH);
}
/* By now, we should have a valid buffer.
* If we don't, then we know that `malloc' failed,
* so we can set `errno = ENOMEM' appropriately.
*/
if (retname == NULL)
errno = ENOMEM;
/* Otherwise, when we do have a valid buffer,
* `_fullpath' should only fail if the path name is too long.
*/
else if ((retname = _fullpath(retname, file_name, _MAX_PATH)) == NULL)
errno = ENAMETOOLONG;
}
/* By the time we get to here,
* `retname' either points to the required resolved path name,
* or it is NULL, with `errno' set appropriately, either of which
* is our required return condition.
*/
return retname;
}
|
