698bda3ac12f89535b59bee290d7b2012822970c
1 /* environ.c -- library for manipulating environments for GNU.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 #include "common-defs.h"
23 /* See common/environ.h. */
26 gdb_environ::operator= (gdb_environ
&&e
)
28 /* Are we self-moving? */
32 m_environ_vector
= std::move (e
.m_environ_vector
);
33 e
.m_environ_vector
.clear ();
34 e
.m_environ_vector
.push_back (NULL
);
38 /* See common/environ.h. */
40 gdb_environ
gdb_environ::from_host_environ ()
42 extern char **environ
;
48 for (int i
= 0; environ
[i
] != NULL
; ++i
)
50 /* Make sure we add the element before the last (NULL). */
51 e
.m_environ_vector
.insert (e
.m_environ_vector
.end () - 1,
52 xstrdup (environ
[i
]));
58 /* See common/environ.h. */
63 for (char *v
: m_environ_vector
)
65 m_environ_vector
.clear ();
66 /* Always add the NULL element. */
67 m_environ_vector
.push_back (NULL
);
70 /* Helper function to check if STRING contains an environment variable
71 assignment of VAR, i.e., if STRING starts with 'VAR='. Return true
72 if it contains, false otherwise. */
75 match_var_in_string (char *string
, const char *var
, size_t var_len
)
77 if (strncmp (string
, var
, var_len
) == 0 && string
[var_len
] == '=')
83 /* See common/environ.h. */
86 gdb_environ::get (const char *var
) const
88 size_t len
= strlen (var
);
90 for (char *el
: m_environ_vector
)
91 if (el
!= NULL
&& match_var_in_string (el
, var
, len
))
97 /* See common/environ.h. */
100 gdb_environ::set (const char *var
, const char *value
)
102 /* We have to unset the variable in the vector if it exists. */
105 /* Insert the element before the last one, which is always NULL. */
106 m_environ_vector
.insert (m_environ_vector
.end () - 1,
107 concat (var
, "=", value
, NULL
));
110 /* See common/environ.h. */
113 gdb_environ::unset (const char *var
)
115 size_t len
= strlen (var
);
117 /* We iterate until '.end () - 1' because the last element is
119 for (std::vector
<char *>::iterator el
= m_environ_vector
.begin ();
120 el
!= m_environ_vector
.end () - 1;
122 if (match_var_in_string (*el
, var
, len
))
125 m_environ_vector
.erase (el
);
130 /* See common/environ.h. */
133 gdb_environ::envp () const
135 return const_cast<char **> (&m_environ_vector
[0]);
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