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
|
/* This file may have been modified by DJ Delorie (Jan 1991). If so,
** these modifications are Copyright (C) 1991 DJ Delorie.
*/
/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <reent.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include "envlock.h"
extern char **environ;
/* Only deal with a pointer to environ, to work around subtle bugs with shared
libraries and/or small data systems where the user declares his own
'environ'. */
static char ***p_environ = &environ;
/* _findenv_r is defined in getenv_r.c. */
extern char *_findenv_r _PARAMS ((struct _reent *, const char *, int *));
/*
* _setenv_r --
* Set the value of the environmental variable "name" to be
* "value". If rewrite is set, replace any current value.
* If "name" contains equal sign, -1 is returned, and errno is
* set to EINVAL;
*/
int
_DEFUN (_setenv_r, (reent_ptr, name, value, rewrite),
struct _reent *reent_ptr,
const char *name,
const char *value,
int rewrite)
{
static int alloced; /* if allocated space before */
register char *C;
int l_value, offset;
if (strchr(name, '='))
{
errno = EINVAL;
return -1;
}
ENV_LOCK;
l_value = strlen (value);
if ((C = _findenv_r (reent_ptr, name, &offset)))
{ /* find if already exists */
if (!rewrite)
{
ENV_UNLOCK;
return 0;
}
if (strlen (C) >= l_value)
{ /* old larger; copy over */
while ((*C++ = *value++) != 0);
ENV_UNLOCK;
return 0;
}
}
else
{ /* create new slot */
register int cnt;
register char **P;
for (P = *p_environ, cnt = 0; *P; ++P, ++cnt);
if (alloced)
{ /* just increase size */
*p_environ = (char **) _realloc_r (reent_ptr, (char *) environ,
(size_t) (sizeof (char *) * (cnt + 2)));
if (!*p_environ)
{
ENV_UNLOCK;
return -1;
}
}
else
{ /* get new space */
alloced = 1; /* copy old entries into it */
P = (char **) _malloc_r (reent_ptr, (size_t) (sizeof (char *) * (cnt + 2)));
if (!P)
{
ENV_UNLOCK;
return (-1);
}
memcpy((char *) P,(char *) *p_environ, cnt * sizeof (char *));
*p_environ = P;
}
(*p_environ)[cnt + 1] = NULL;
offset = cnt;
}
for (C = (char *) name; *C && *C != '='; ++C); /* no `=' in name */
if (!((*p_environ)[offset] = /* name + `=' + value */
_malloc_r (reent_ptr, (size_t) ((int) (C - name) + l_value + 2))))
{
ENV_UNLOCK;
return -1;
}
for (C = (*p_environ)[offset]; (*C = *name++) && *C != '='; ++C);
for (*C++ = '='; (*C++ = *value++) != 0;);
ENV_UNLOCK;
return 0;
}
/*
* _unsetenv_r(name) --
* Delete environmental variable "name".
*/
int
_DEFUN (_unsetenv_r, (reent_ptr, name),
struct _reent *reent_ptr,
const char *name)
{
register char **P;
int offset;
/* Name cannot be NULL, empty, or contain an equal sign. */
if (name == NULL || name[0] == '\0' || strchr(name, '='))
{
errno = EINVAL;
return -1;
}
ENV_LOCK;
while (_findenv_r (reent_ptr, name, &offset)) /* if set multiple times */
{
for (P = &(*p_environ)[offset];; ++P)
if (!(*P = *(P + 1)))
break;
}
ENV_UNLOCK;
return 0;
}
|
