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
184
185
|
/* environ.c -- library for manipulating environments for GNU.
Copyright (C) 1986, 1989 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
#include "defs.h"
#include "environ.h"
#include "gdb_string.h"
#include "gdbcore.h"
/* Return a new environment object. */
struct environ *
make_environ (void)
{
register struct environ *e;
e = (struct environ *) xmalloc (sizeof (struct environ));
e->allocated = 10;
e->vector = (char **) xmalloc ((e->allocated + 1) * sizeof (char *));
e->vector[0] = 0;
return e;
}
/* Free an environment and all the strings in it. */
void
free_environ (register struct environ *e)
{
register char **vector = e->vector;
while (*vector)
xfree (*vector++);
xfree (e);
}
/* Copy the environment given to this process into E.
Also copies all the strings in it, so we can be sure
that all strings in these environments are safe to free. */
void
init_environ (register struct environ *e)
{
extern char **environ;
register int i;
if (environ == NULL)
return;
for (i = 0; environ[i]; i++) /*EMPTY */ ;
if (e->allocated < i)
{
e->allocated = max (i, e->allocated + 10);
e->vector = (char **) xrealloc ((char *) e->vector,
(e->allocated + 1) * sizeof (char *));
}
memcpy (e->vector, environ, (i + 1) * sizeof (char *));
while (--i >= 0)
{
register int len = strlen (e->vector[i]);
register char *new = (char *) xmalloc (len + 1);
memcpy (new, e->vector[i], len + 1);
e->vector[i] = new;
}
}
/* Return the vector of environment E.
This is used to get something to pass to execve. */
char **
environ_vector (struct environ *e)
{
return e->vector;
}
/* Return the value in environment E of variable VAR. */
char *
get_in_environ (const struct environ *e, const char *var)
{
register int len = strlen (var);
register char **vector = e->vector;
register char *s;
for (; (s = *vector) != NULL; vector++)
if (STREQN (s, var, len) && s[len] == '=')
return &s[len + 1];
return 0;
}
/* Store the value in E of VAR as VALUE. */
void
set_in_environ (struct environ *e, const char *var, const char *value)
{
register int i;
register int len = strlen (var);
register char **vector = e->vector;
register char *s;
for (i = 0; (s = vector[i]) != NULL; i++)
if (STREQN (s, var, len) && s[len] == '=')
break;
if (s == 0)
{
if (i == e->allocated)
{
e->allocated += 10;
vector = (char **) xrealloc ((char *) vector,
(e->allocated + 1) * sizeof (char *));
e->vector = vector;
}
vector[i + 1] = 0;
}
else
xfree (s);
s = (char *) xmalloc (len + strlen (value) + 2);
strcpy (s, var);
strcat (s, "=");
strcat (s, value);
vector[i] = s;
/* This used to handle setting the PATH and GNUTARGET variables
specially. The latter has been replaced by "set gnutarget"
(which has worked since GDB 4.11). The former affects searching
the PATH to find SHELL, and searching the PATH to find the
argument of "symbol-file" or "exec-file". Maybe we should have
some kind of "set exec-path" for that. But in any event, having
"set env" affect anything besides the inferior is a bad idea.
What if we want to change the environment we pass to the program
without afecting GDB's behavior? */
return;
}
/* Remove the setting for variable VAR from environment E. */
void
unset_in_environ (struct environ *e, char *var)
{
register int len = strlen (var);
register char **vector = e->vector;
register char *s;
for (; (s = *vector) != NULL; vector++)
{
if (STREQN (s, var, len) && s[len] == '=')
{
xfree (s);
/* Walk through the vector, shuffling args down by one, including
the NULL terminator. Can't use memcpy() here since the regions
overlap, and memmove() might not be available. */
while ((vector[0] = vector[1]) != NULL)
{
vector++;
}
break;
}
}
}
|
