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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/* environ.c -- library for manipulating environments for GNU.
Copyright (C) 1986-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "common-defs.h"
#include "environ.h"
#include <algorithm>
#include <utility>
/* See common/environ.h. */
gdb_environ &
gdb_environ::operator= (gdb_environ &&e)
{
/* Are we self-moving? */
if (&e == this)
return *this;
m_environ_vector = std::move (e.m_environ_vector);
m_user_set_env = std::move (e.m_user_set_env);
m_user_unset_env = std::move (e.m_user_unset_env);
e.m_environ_vector.clear ();
e.m_environ_vector.push_back (NULL);
e.m_user_set_env.clear ();
e.m_user_unset_env.clear ();
return *this;
}
/* See common/environ.h. */
gdb_environ gdb_environ::from_host_environ ()
{
extern char **environ;
gdb_environ e;
if (environ == NULL)
return e;
for (int i = 0; environ[i] != NULL; ++i)
{
/* Make sure we add the element before the last (NULL). */
e.m_environ_vector.insert (e.m_environ_vector.end () - 1,
xstrdup (environ[i]));
}
return e;
}
/* See common/environ.h. */
void
gdb_environ::clear ()
{
for (char *v : m_environ_vector)
xfree (v);
m_environ_vector.clear ();
/* Always add the NULL element. */
m_environ_vector.push_back (NULL);
m_user_set_env.clear ();
m_user_unset_env.clear ();
}
/* Helper function to check if STRING contains an environment variable
assignment of VAR, i.e., if STRING starts with 'VAR='. Return true
if it contains, false otherwise. */
static bool
match_var_in_string (const char *string, const char *var, size_t var_len)
{
if (strncmp (string, var, var_len) == 0 && string[var_len] == '=')
return true;
return false;
}
/* See common/environ.h. */
const char *
gdb_environ::get (const char *var) const
{
size_t len = strlen (var);
for (char *el : m_environ_vector)
if (el != NULL && match_var_in_string (el, var, len))
return &el[len + 1];
return NULL;
}
/* See common/environ.h. */
void
gdb_environ::set (const char *var, const char *value)
{
char *fullvar = concat (var, "=", value, NULL);
/* We have to unset the variable in the vector if it exists. */
unset (var, false);
/* Insert the element before the last one, which is always NULL. */
m_environ_vector.insert (m_environ_vector.end () - 1, fullvar);
/* Mark this environment variable as having been set by the user.
This will be useful when we deal with setting environment
variables on the remote target. */
m_user_set_env.insert (std::string (fullvar));
/* If this environment variable is marked as unset by the user, then
remove it from the list, because now the user wants to set
it. */
m_user_unset_env.erase (std::string (var));
}
/* See common/environ.h. */
void
gdb_environ::unset (const char *var, bool update_unset_list)
{
size_t len = strlen (var);
std::vector<char *>::iterator it_env;
/* We iterate until '.end () - 1' because the last element is
always NULL. */
for (it_env = m_environ_vector.begin ();
it_env != m_environ_vector.end () - 1;
++it_env)
if (match_var_in_string (*it_env, var, len))
break;
if (it_env != m_environ_vector.end () - 1)
{
m_user_set_env.erase (std::string (*it_env));
xfree (*it_env);
m_environ_vector.erase (it_env);
}
if (update_unset_list)
m_user_unset_env.insert (std::string (var));
}
/* See common/environ.h. */
void
gdb_environ::unset (const char *var)
{
unset (var, true);
}
/* See common/environ.h. */
char **
gdb_environ::envp () const
{
return const_cast<char **> (&m_environ_vector[0]);
}
/* See common/environ.h. */
const std::set<std::string> &
gdb_environ::user_set_env () const
{
return m_user_set_env;
}
const std::set<std::string> &
gdb_environ::user_unset_env () const
{
return m_user_unset_env;
}
|
