Commit | Line | Data |
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c906108c | 1 | /* environ.c -- library for manipulating environments for GNU. |
69517000 | 2 | |
61baf725 | 3 | Copyright (C) 1986-2017 Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b JM |
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 | |
a9762ec7 | 7 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 8 | (at your option) any later version. |
c906108c | 9 | |
c5aa993b JM |
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. | |
c906108c | 14 | |
c5aa993b | 15 | You should have received a copy of the GNU General Public License |
a9762ec7 | 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c | 17 | |
c906108c SS |
18 | #include "defs.h" |
19 | #include "environ.h" | |
325fac50 | 20 | #include <algorithm> |
c906108c | 21 | \f |
c5aa993b | 22 | |
c906108c SS |
23 | /* Return a new environment object. */ |
24 | ||
1bf1958d | 25 | struct gdb_environ * |
fba45db2 | 26 | make_environ (void) |
c906108c | 27 | { |
1bf1958d | 28 | struct gdb_environ *e; |
c906108c | 29 | |
8d749320 | 30 | e = XNEW (struct gdb_environ); |
c906108c SS |
31 | |
32 | e->allocated = 10; | |
33 | e->vector = (char **) xmalloc ((e->allocated + 1) * sizeof (char *)); | |
34 | e->vector[0] = 0; | |
35 | return e; | |
36 | } | |
37 | ||
38 | /* Free an environment and all the strings in it. */ | |
39 | ||
40 | void | |
1bf1958d | 41 | free_environ (struct gdb_environ *e) |
c906108c | 42 | { |
52f0bd74 | 43 | char **vector = e->vector; |
c906108c SS |
44 | |
45 | while (*vector) | |
b8c9b27d | 46 | xfree (*vector++); |
c906108c | 47 | |
9a61c7a6 | 48 | xfree (e->vector); |
b8c9b27d | 49 | xfree (e); |
c906108c SS |
50 | } |
51 | ||
52 | /* Copy the environment given to this process into E. | |
53 | Also copies all the strings in it, so we can be sure | |
54 | that all strings in these environments are safe to free. */ | |
55 | ||
56 | void | |
1bf1958d | 57 | init_environ (struct gdb_environ *e) |
c906108c SS |
58 | { |
59 | extern char **environ; | |
52f0bd74 | 60 | int i; |
c906108c SS |
61 | |
62 | if (environ == NULL) | |
63 | return; | |
64 | ||
c5aa993b | 65 | for (i = 0; environ[i]; i++) /*EMPTY */ ; |
c906108c SS |
66 | |
67 | if (e->allocated < i) | |
68 | { | |
325fac50 | 69 | e->allocated = std::max (i, e->allocated + 10); |
c5aa993b | 70 | e->vector = (char **) xrealloc ((char *) e->vector, |
c906108c SS |
71 | (e->allocated + 1) * sizeof (char *)); |
72 | } | |
73 | ||
74 | memcpy (e->vector, environ, (i + 1) * sizeof (char *)); | |
75 | ||
76 | while (--i >= 0) | |
77 | { | |
aa1ee363 | 78 | int len = strlen (e->vector[i]); |
fe978cb0 | 79 | char *newobj = (char *) xmalloc (len + 1); |
d7f9d729 | 80 | |
fe978cb0 PA |
81 | memcpy (newobj, e->vector[i], len + 1); |
82 | e->vector[i] = newobj; | |
c906108c SS |
83 | } |
84 | } | |
85 | ||
86 | /* Return the vector of environment E. | |
87 | This is used to get something to pass to execve. */ | |
88 | ||
89 | char ** | |
1bf1958d | 90 | environ_vector (struct gdb_environ *e) |
c906108c SS |
91 | { |
92 | return e->vector; | |
93 | } | |
94 | \f | |
95 | /* Return the value in environment E of variable VAR. */ | |
96 | ||
97 | char * | |
1bf1958d | 98 | get_in_environ (const struct gdb_environ *e, const char *var) |
c906108c | 99 | { |
52f0bd74 AC |
100 | int len = strlen (var); |
101 | char **vector = e->vector; | |
102 | char *s; | |
c906108c SS |
103 | |
104 | for (; (s = *vector) != NULL; vector++) | |
bf896cb0 | 105 | if (strncmp (s, var, len) == 0 && s[len] == '=') |
c906108c SS |
106 | return &s[len + 1]; |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | /* Store the value in E of VAR as VALUE. */ | |
112 | ||
113 | void | |
1bf1958d | 114 | set_in_environ (struct gdb_environ *e, const char *var, const char *value) |
c906108c | 115 | { |
52f0bd74 AC |
116 | int i; |
117 | int len = strlen (var); | |
118 | char **vector = e->vector; | |
119 | char *s; | |
c906108c SS |
120 | |
121 | for (i = 0; (s = vector[i]) != NULL; i++) | |
bf896cb0 | 122 | if (strncmp (s, var, len) == 0 && s[len] == '=') |
c906108c SS |
123 | break; |
124 | ||
125 | if (s == 0) | |
126 | { | |
127 | if (i == e->allocated) | |
128 | { | |
129 | e->allocated += 10; | |
c5aa993b | 130 | vector = (char **) xrealloc ((char *) vector, |
c906108c SS |
131 | (e->allocated + 1) * sizeof (char *)); |
132 | e->vector = vector; | |
133 | } | |
134 | vector[i + 1] = 0; | |
135 | } | |
136 | else | |
b8c9b27d | 137 | xfree (s); |
c906108c SS |
138 | |
139 | s = (char *) xmalloc (len + strlen (value) + 2); | |
140 | strcpy (s, var); | |
141 | strcat (s, "="); | |
142 | strcat (s, value); | |
143 | vector[i] = s; | |
144 | ||
145 | /* This used to handle setting the PATH and GNUTARGET variables | |
146 | specially. The latter has been replaced by "set gnutarget" | |
147 | (which has worked since GDB 4.11). The former affects searching | |
148 | the PATH to find SHELL, and searching the PATH to find the | |
149 | argument of "symbol-file" or "exec-file". Maybe we should have | |
150 | some kind of "set exec-path" for that. But in any event, having | |
151 | "set env" affect anything besides the inferior is a bad idea. | |
152 | What if we want to change the environment we pass to the program | |
153 | without afecting GDB's behavior? */ | |
154 | ||
155 | return; | |
156 | } | |
157 | ||
158 | /* Remove the setting for variable VAR from environment E. */ | |
159 | ||
160 | void | |
41c77899 | 161 | unset_in_environ (struct gdb_environ *e, const char *var) |
c906108c | 162 | { |
52f0bd74 AC |
163 | int len = strlen (var); |
164 | char **vector = e->vector; | |
165 | char *s; | |
c906108c SS |
166 | |
167 | for (; (s = *vector) != NULL; vector++) | |
168 | { | |
591e78ff | 169 | if (strncmp (s, var, len) == 0 && s[len] == '=') |
c906108c | 170 | { |
b8c9b27d | 171 | xfree (s); |
c906108c SS |
172 | /* Walk through the vector, shuffling args down by one, including |
173 | the NULL terminator. Can't use memcpy() here since the regions | |
0963b4bd | 174 | overlap, and memmove() might not be available. */ |
c906108c SS |
175 | while ((vector[0] = vector[1]) != NULL) |
176 | { | |
177 | vector++; | |
178 | } | |
179 | break; | |
180 | } | |
181 | } | |
182 | } |