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726f6388 JA |
1 | /* flags.c -- Everything about flags except the `set' command. That |
2 | is in builtins.c */ | |
3 | ||
4 | /* Copyright (C) 1987,1989 Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GNU Bash, the Bourne Again SHell. | |
7 | ||
8 | Bash is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
bb70624e | 10 | Software Foundation; either version 2, or (at your option) any later |
726f6388 JA |
11 | version. |
12 | ||
13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License along | |
19 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 20 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
726f6388 JA |
21 | |
22 | /* Flags hacking. */ | |
ccc6cda3 JA |
23 | #include "config.h" |
24 | #if defined (HAVE_UNISTD_H) | |
25 | # include <unistd.h> | |
26 | #endif | |
726f6388 JA |
27 | |
28 | #include "shell.h" | |
29 | #include "flags.h" | |
30 | ||
ccc6cda3 JA |
31 | #if defined (JOB_CONTROL) |
32 | extern int set_job_control (); | |
33 | #endif | |
34 | ||
d166f048 JA |
35 | #if defined (RESTRICTED_SHELL) |
36 | extern char *shell_name; | |
37 | #endif | |
38 | ||
bb70624e JA |
39 | /* -c, -s invocation options -- not really flags, but they show up in $- */ |
40 | extern int want_pending_command, read_from_stdin; | |
41 | ||
726f6388 JA |
42 | /* **************************************************************** */ |
43 | /* */ | |
44 | /* The Standard Sh Flags. */ | |
45 | /* */ | |
46 | /* **************************************************************** */ | |
47 | ||
48 | /* Non-zero means automatically mark variables which are modified or created | |
49 | as auto export variables. */ | |
50 | int mark_modified_vars = 0; | |
51 | ||
52 | /* Non-zero causes asynchronous job notification. Otherwise, job state | |
53 | notification only takes place just before a primary prompt is printed. */ | |
54 | int asynchronous_notification = 0; | |
55 | ||
56 | /* Non-zero means exit immediately if a command exits with a non-zero | |
57 | exit status. */ | |
58 | int exit_immediately_on_error = 0; | |
59 | ||
60 | /* Non-zero means disable filename globbing. */ | |
61 | int disallow_filename_globbing = 0; | |
62 | ||
726f6388 JA |
63 | /* Non-zero means that all keyword arguments are placed into the environment |
64 | for a command, not just those that appear on the line before the command | |
65 | name. */ | |
66 | int place_keywords_in_env = 0; | |
67 | ||
ccc6cda3 | 68 | /* Non-zero means read commands, but don't execute them. This is useful |
726f6388 JA |
69 | for debugging shell scripts that should do something hairy and possibly |
70 | desctructive. */ | |
71 | int read_but_dont_execute = 0; | |
72 | ||
73 | /* Non-zero means end of file is after one command. */ | |
74 | int just_one_command = 0; | |
75 | ||
76 | /* Non-zero means don't overwrite existing files while doing redirections. */ | |
77 | int noclobber = 0; | |
78 | ||
79 | /* Non-zero means trying to get the value of $i where $i is undefined | |
80 | causes an error, instead of a null substitution. */ | |
81 | int unbound_vars_is_error = 0; | |
82 | ||
83 | /* Non-zero means type out input lines after you read them. */ | |
84 | int echo_input_at_read = 0; | |
85 | ||
86 | /* Non-zero means type out the command definition after reading, but | |
87 | before executing. */ | |
88 | int echo_command_at_execute = 0; | |
89 | ||
90 | /* Non-zero means turn on the job control features. */ | |
91 | int jobs_m_flag = 0; | |
92 | ||
93 | /* Non-zero means this shell is interactive, even if running under a | |
94 | pipe. */ | |
95 | int forced_interactive = 0; | |
96 | ||
97 | /* By default, follow the symbolic links as if they were real directories | |
98 | while hacking the `cd' command. This means that `cd ..' moves up in | |
99 | the string of symbolic links that make up the current directory, instead | |
100 | of the absolute directory. The shell variable `nolinks' also controls | |
101 | this flag. */ | |
102 | int no_symbolic_links = 0; | |
103 | ||
104 | /* **************************************************************** */ | |
105 | /* */ | |
106 | /* Non-Standard Flags Follow Here. */ | |
107 | /* */ | |
108 | /* **************************************************************** */ | |
109 | ||
ccc6cda3 | 110 | #if 0 |
726f6388 JA |
111 | /* Non-zero means do lexical scoping in the body of a FOR command. */ |
112 | int lexical_scoping = 0; | |
ccc6cda3 | 113 | #endif |
726f6388 JA |
114 | |
115 | /* Non-zero means no such thing as invisible variables. */ | |
116 | int no_invisible_vars = 0; | |
117 | ||
ccc6cda3 JA |
118 | /* Non-zero means look up and remember command names in a hash table, */ |
119 | int hashing_enabled = 1; | |
726f6388 JA |
120 | |
121 | #if defined (BANG_HISTORY) | |
122 | /* Non-zero means that we are doing history expansion. The default. | |
123 | This means !22 gets the 22nd line of history. */ | |
124 | int history_expansion = 1; | |
125 | #endif /* BANG_HISTORY */ | |
126 | ||
127 | /* Non-zero means that we allow comments to appear in interactive commands. */ | |
726f6388 | 128 | int interactive_comments = 1; |
726f6388 JA |
129 | |
130 | #if defined (RESTRICTED_SHELL) | |
131 | /* Non-zero means that this shell is `restricted'. A restricted shell | |
132 | disallows: changing directories, command or path names containing `/', | |
133 | unsetting or resetting the values of $PATH and $SHELL, and any type of | |
134 | output redirection. */ | |
b72432fd JA |
135 | int restricted = 0; /* currently restricted */ |
136 | int restricted_shell = 0; /* shell was started in restricted mode. */ | |
726f6388 JA |
137 | #endif /* RESTRICTED_SHELL */ |
138 | ||
139 | /* Non-zero means that this shell is running in `privileged' mode. This | |
e8ce775d JA |
140 | is required if the shell is to run setuid. If the `-p' option is |
141 | not supplied at startup, and the real and effective uids or gids | |
142 | differ, disable_priv_mode is called to relinquish setuid status. */ | |
726f6388 JA |
143 | int privileged_mode = 0; |
144 | ||
ccc6cda3 JA |
145 | #if defined (BRACE_EXPANSION) |
146 | /* Zero means to disable brace expansion: foo{a,b} -> fooa foob */ | |
147 | int brace_expansion = 1; | |
148 | #endif | |
149 | ||
726f6388 JA |
150 | /* **************************************************************** */ |
151 | /* */ | |
152 | /* The Flags ALIST. */ | |
153 | /* */ | |
154 | /* **************************************************************** */ | |
155 | ||
156 | struct flags_alist shell_flags[] = { | |
157 | /* Standard sh flags. */ | |
158 | { 'a', &mark_modified_vars }, | |
159 | #if defined (JOB_CONTROL) | |
160 | { 'b', &asynchronous_notification }, | |
161 | #endif /* JOB_CONTROL */ | |
162 | { 'e', &exit_immediately_on_error }, | |
163 | { 'f', &disallow_filename_globbing }, | |
ccc6cda3 | 164 | { 'h', &hashing_enabled }, |
726f6388 JA |
165 | { 'i', &forced_interactive }, |
166 | { 'k', &place_keywords_in_env }, | |
167 | #if defined (JOB_CONTROL) | |
168 | { 'm', &jobs_m_flag }, | |
169 | #endif /* JOB_CONTROL */ | |
170 | { 'n', &read_but_dont_execute }, | |
171 | { 'p', &privileged_mode }, | |
172 | #if defined (RESTRICTED_SHELL) | |
173 | { 'r', &restricted }, | |
174 | #endif /* RESTRICTED_SHELL */ | |
175 | { 't', &just_one_command }, | |
176 | { 'u', &unbound_vars_is_error }, | |
177 | { 'v', &echo_input_at_read }, | |
178 | { 'x', &echo_command_at_execute }, | |
179 | { 'C', &noclobber }, | |
180 | ||
181 | /* New flags that control non-standard things. */ | |
ccc6cda3 | 182 | #if 0 |
726f6388 | 183 | { 'l', &lexical_scoping }, |
ccc6cda3 | 184 | #endif |
726f6388 JA |
185 | { 'I', &no_invisible_vars }, |
186 | ||
726f6388 JA |
187 | { 'P', &no_symbolic_links }, |
188 | ||
ccc6cda3 JA |
189 | #if defined (BRACE_EXPANSION) |
190 | { 'B', &brace_expansion }, | |
191 | #endif | |
192 | ||
726f6388 | 193 | #if defined (BANG_HISTORY) |
726f6388 JA |
194 | { 'H', &history_expansion }, |
195 | #endif /* BANG_HISTORY */ | |
196 | ||
197 | {0, (int *)NULL} | |
198 | }; | |
199 | ||
200 | #define NUM_SHELL_FLAGS (sizeof (shell_flags) / sizeof (struct flags_alist)) | |
201 | ||
202 | int * | |
203 | find_flag (name) | |
204 | int name; | |
205 | { | |
ccc6cda3 JA |
206 | int i; |
207 | for (i = 0; shell_flags[i].name; i++) | |
726f6388 JA |
208 | { |
209 | if (shell_flags[i].name == name) | |
210 | return (shell_flags[i].value); | |
726f6388 JA |
211 | } |
212 | return (FLAG_UNKNOWN); | |
213 | } | |
214 | ||
215 | /* Change the state of a flag, and return it's original value, or return | |
cce855bc JA |
216 | FLAG_ERROR if there is no flag FLAG. ON_OR_OFF must be either |
217 | FLAG_ON or FLAG_OFF. */ | |
726f6388 JA |
218 | int |
219 | change_flag (flag, on_or_off) | |
220 | int flag; | |
221 | int on_or_off; | |
222 | { | |
ccc6cda3 JA |
223 | int *value, old_value; |
224 | ||
726f6388 JA |
225 | #if defined (RESTRICTED_SHELL) |
226 | /* Don't allow "set +r" in a shell which is `restricted'. */ | |
227 | if (restricted && flag == 'r' && on_or_off == FLAG_OFF) | |
228 | return (FLAG_ERROR); | |
229 | #endif /* RESTRICTED_SHELL */ | |
230 | ||
bb70624e JA |
231 | value = find_flag (flag); |
232 | ||
cce855bc | 233 | if ((value == (int *)FLAG_UNKNOWN) || (on_or_off != FLAG_ON && on_or_off != FLAG_OFF)) |
726f6388 | 234 | return (FLAG_ERROR); |
ccc6cda3 JA |
235 | |
236 | old_value = *value; | |
726f6388 | 237 | |
cce855bc | 238 | *value = (on_or_off == FLAG_ON) ? 1 : 0; |
726f6388 JA |
239 | |
240 | /* Special cases for a few flags. */ | |
241 | switch (flag) | |
242 | { | |
243 | #if defined (JOB_CONTROL) | |
244 | case 'm': | |
d166f048 | 245 | set_job_control (on_or_off == FLAG_ON); |
726f6388 JA |
246 | break; |
247 | #endif /* JOB_CONTROL */ | |
248 | ||
d166f048 JA |
249 | #if defined (RESTRICTED_SHELL) |
250 | case 'r': | |
251 | if (on_or_off == FLAG_ON) | |
28ef6c31 | 252 | maybe_make_restricted (shell_name); |
d166f048 JA |
253 | break; |
254 | #endif | |
255 | ||
256 | #if defined (BANG_HISTORY) | |
257 | case 'H': | |
258 | if (on_or_off == FLAG_ON) | |
259 | bash_initialize_history (); | |
260 | break; | |
261 | #endif | |
262 | ||
726f6388 | 263 | case 'p': |
d166f048 | 264 | if (on_or_off == FLAG_OFF) |
ccc6cda3 JA |
265 | disable_priv_mode (); |
266 | ||
726f6388 JA |
267 | break; |
268 | } | |
ccc6cda3 | 269 | |
726f6388 JA |
270 | return (old_value); |
271 | } | |
272 | ||
273 | /* Return a string which is the names of all the currently | |
274 | set shell flags. */ | |
275 | char * | |
276 | which_set_flags () | |
277 | { | |
ccc6cda3 JA |
278 | char *temp; |
279 | int i, string_index; | |
726f6388 | 280 | |
bb70624e | 281 | temp = xmalloc (1 + NUM_SHELL_FLAGS + read_from_stdin + want_pending_command); |
ccc6cda3 | 282 | for (i = string_index = 0; shell_flags[i].name; i++) |
726f6388 JA |
283 | if (*(shell_flags[i].value)) |
284 | temp[string_index++] = shell_flags[i].name; | |
285 | ||
bb70624e JA |
286 | if (want_pending_command) |
287 | temp[string_index++] = 'c'; | |
288 | if (read_from_stdin) | |
289 | temp[string_index++] = 's'; | |
290 | ||
726f6388 JA |
291 | temp[string_index] = '\0'; |
292 | return (temp); | |
293 | } | |
d166f048 JA |
294 | |
295 | void | |
296 | reset_shell_flags () | |
297 | { | |
298 | mark_modified_vars = exit_immediately_on_error = disallow_filename_globbing = 0; | |
299 | place_keywords_in_env = read_but_dont_execute = just_one_command = 0; | |
300 | noclobber = unbound_vars_is_error = echo_input_at_read = 0; | |
301 | echo_command_at_execute = jobs_m_flag = forced_interactive = 0; | |
302 | no_symbolic_links = no_invisible_vars = privileged_mode = 0; | |
303 | ||
304 | hashing_enabled = interactive_comments = 1; | |
305 | ||
306 | #if defined (JOB_CONTROL) | |
307 | asynchronous_notification = 0; | |
308 | #endif | |
309 | ||
310 | #if defined (BANG_HISTORY) | |
311 | history_expansion = 1; | |
312 | #endif | |
313 | ||
314 | #if defined (BRACE_EXPANSION) | |
315 | brace_expansion = 1; | |
316 | #endif | |
317 | ||
318 | #if defined (RESTRICTED_SHELL) | |
319 | restricted = 0; | |
320 | #endif | |
321 | } |