1 /* environ.c -- library for manipulating environments for GNU.
3 Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 2000, 2005
4 2003, 2007, 2008 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #define min(a, b) ((a) < (b) ? (a) : (b))
20 #define max(a, b) ((a) > (b) ? (a) : (b))
24 #include "gdb_string.h"
27 /* Return a new environment object. */
32 struct gdb_environ
*e
;
34 e
= (struct gdb_environ
*) xmalloc (sizeof (struct gdb_environ
));
37 e
->vector
= (char **) xmalloc ((e
->allocated
+ 1) * sizeof (char *));
42 /* Free an environment and all the strings in it. */
45 free_environ (struct gdb_environ
*e
)
47 char **vector
= e
->vector
;
55 /* Copy the environment given to this process into E.
56 Also copies all the strings in it, so we can be sure
57 that all strings in these environments are safe to free. */
60 init_environ (struct gdb_environ
*e
)
62 extern char **environ
;
68 for (i
= 0; environ
[i
]; i
++) /*EMPTY */ ;
72 e
->allocated
= max (i
, e
->allocated
+ 10);
73 e
->vector
= (char **) xrealloc ((char *) e
->vector
,
74 (e
->allocated
+ 1) * sizeof (char *));
77 memcpy (e
->vector
, environ
, (i
+ 1) * sizeof (char *));
81 int len
= strlen (e
->vector
[i
]);
82 char *new = (char *) xmalloc (len
+ 1);
83 memcpy (new, e
->vector
[i
], len
+ 1);
88 /* Return the vector of environment E.
89 This is used to get something to pass to execve. */
92 environ_vector (struct gdb_environ
*e
)
97 /* Return the value in environment E of variable VAR. */
100 get_in_environ (const struct gdb_environ
*e
, const char *var
)
102 int len
= strlen (var
);
103 char **vector
= e
->vector
;
106 for (; (s
= *vector
) != NULL
; vector
++)
107 if (strncmp (s
, var
, len
) == 0 && s
[len
] == '=')
113 /* Store the value in E of VAR as VALUE. */
116 set_in_environ (struct gdb_environ
*e
, const char *var
, const char *value
)
119 int len
= strlen (var
);
120 char **vector
= e
->vector
;
123 for (i
= 0; (s
= vector
[i
]) != NULL
; i
++)
124 if (strncmp (s
, var
, len
) == 0 && s
[len
] == '=')
129 if (i
== e
->allocated
)
132 vector
= (char **) xrealloc ((char *) vector
,
133 (e
->allocated
+ 1) * sizeof (char *));
141 s
= (char *) xmalloc (len
+ strlen (value
) + 2);
147 /* This used to handle setting the PATH and GNUTARGET variables
148 specially. The latter has been replaced by "set gnutarget"
149 (which has worked since GDB 4.11). The former affects searching
150 the PATH to find SHELL, and searching the PATH to find the
151 argument of "symbol-file" or "exec-file". Maybe we should have
152 some kind of "set exec-path" for that. But in any event, having
153 "set env" affect anything besides the inferior is a bad idea.
154 What if we want to change the environment we pass to the program
155 without afecting GDB's behavior? */
160 /* Remove the setting for variable VAR from environment E. */
163 unset_in_environ (struct gdb_environ
*e
, char *var
)
165 int len
= strlen (var
);
166 char **vector
= e
->vector
;
169 for (; (s
= *vector
) != NULL
; vector
++)
171 if (strncmp (s
, var
, len
) == 0 && s
[len
] == '=')
174 /* Walk through the vector, shuffling args down by one, including
175 the NULL terminator. Can't use memcpy() here since the regions
176 overlap, and memmove() might not be available. */
177 while ((vector
[0] = vector
[1]) != NULL
)
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