1 /* environ.c -- library for manipulating environments for GNU.
2 Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 2000
3 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 2 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, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #define min(a, b) ((a) < (b) ? (a) : (b))
21 #define max(a, b) ((a) > (b) ? (a) : (b))
25 #include "gdb_string.h"
28 /* Return a new environment object. */
33 register struct environ
*e
;
35 e
= (struct environ
*) xmalloc (sizeof (struct environ
));
38 e
->vector
= (char **) xmalloc ((e
->allocated
+ 1) * sizeof (char *));
43 /* Free an environment and all the strings in it. */
46 free_environ (register struct environ
*e
)
48 register char **vector
= e
->vector
;
56 /* Copy the environment given to this process into E.
57 Also copies all the strings in it, so we can be sure
58 that all strings in these environments are safe to free. */
61 init_environ (register struct environ
*e
)
63 extern char **environ
;
69 for (i
= 0; environ
[i
]; i
++) /*EMPTY */ ;
73 e
->allocated
= max (i
, e
->allocated
+ 10);
74 e
->vector
= (char **) xrealloc ((char *) e
->vector
,
75 (e
->allocated
+ 1) * sizeof (char *));
78 memcpy (e
->vector
, environ
, (i
+ 1) * sizeof (char *));
82 register int len
= strlen (e
->vector
[i
]);
83 register char *new = (char *) xmalloc (len
+ 1);
84 memcpy (new, e
->vector
[i
], len
+ 1);
89 /* Return the vector of environment E.
90 This is used to get something to pass to execve. */
93 environ_vector (struct environ
*e
)
98 /* Return the value in environment E of variable VAR. */
101 get_in_environ (const struct environ
*e
, const char *var
)
103 register int len
= strlen (var
);
104 register char **vector
= e
->vector
;
107 for (; (s
= *vector
) != NULL
; vector
++)
108 if (STREQN (s
, var
, len
) && s
[len
] == '=')
114 /* Store the value in E of VAR as VALUE. */
117 set_in_environ (struct environ
*e
, const char *var
, const char *value
)
120 register int len
= strlen (var
);
121 register char **vector
= e
->vector
;
124 for (i
= 0; (s
= vector
[i
]) != NULL
; i
++)
125 if (STREQN (s
, var
, len
) && s
[len
] == '=')
130 if (i
== e
->allocated
)
133 vector
= (char **) xrealloc ((char *) vector
,
134 (e
->allocated
+ 1) * sizeof (char *));
142 s
= (char *) xmalloc (len
+ strlen (value
) + 2);
148 /* This used to handle setting the PATH and GNUTARGET variables
149 specially. The latter has been replaced by "set gnutarget"
150 (which has worked since GDB 4.11). The former affects searching
151 the PATH to find SHELL, and searching the PATH to find the
152 argument of "symbol-file" or "exec-file". Maybe we should have
153 some kind of "set exec-path" for that. But in any event, having
154 "set env" affect anything besides the inferior is a bad idea.
155 What if we want to change the environment we pass to the program
156 without afecting GDB's behavior? */
161 /* Remove the setting for variable VAR from environment E. */
164 unset_in_environ (struct environ
*e
, char *var
)
166 register int len
= strlen (var
);
167 register char **vector
= e
->vector
;
170 for (; (s
= *vector
) != NULL
; vector
++)
172 if (STREQN (s
, var
, len
) && s
[len
] == '=')
175 /* Walk through the vector, shuffling args down by one, including
176 the NULL terminator. Can't use memcpy() here since the regions
177 overlap, and memmove() might not be available. */
178 while ((vector
[0] = vector
[1]) != NULL
)
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