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726f6388 JA |
1 | /* flags.c -- Everything about flags except the `set' command. That |
2 | is in builtins.c */ | |
3 | ||
012bac39 | 4 | /* Copyright (C) 1987-2009 Free Software Foundation, Inc. |
726f6388 | 5 | |
2e4498b3 | 6 | This file is part of GNU Bash, the Bourne Again SHell. |
726f6388 | 7 | |
2e4498b3 CR |
8 | Bash is free software: you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation, either version 3 of the License, or | |
11 | (at your option) any later version. | |
726f6388 | 12 | |
2e4498b3 CR |
13 | Bash is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
726f6388 | 17 | |
2e4498b3 CR |
18 | You should have received a copy of the GNU General Public License |
19 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
726f6388 | 21 | |
ccc6cda3 JA |
22 | #include "config.h" |
23 | #if defined (HAVE_UNISTD_H) | |
24 | # include <unistd.h> | |
25 | #endif | |
726f6388 JA |
26 | |
27 | #include "shell.h" | |
28 | #include "flags.h" | |
29 | ||
f73dda09 JA |
30 | #if defined (BANG_HISTORY) |
31 | # include "bashhist.h" | |
32 | #endif | |
33 | ||
ccc6cda3 | 34 | #if defined (JOB_CONTROL) |
f73dda09 | 35 | extern int set_job_control __P((int)); |
ccc6cda3 JA |
36 | #endif |
37 | ||
d166f048 JA |
38 | #if defined (RESTRICTED_SHELL) |
39 | extern char *shell_name; | |
40 | #endif | |
41 | ||
a5e25162 CR |
42 | extern int shell_initialized; |
43 | ||
bb70624e JA |
44 | /* -c, -s invocation options -- not really flags, but they show up in $- */ |
45 | extern int want_pending_command, read_from_stdin; | |
46 | ||
726f6388 JA |
47 | /* **************************************************************** */ |
48 | /* */ | |
6a8fd0ed | 49 | /* The Standard sh Flags. */ |
726f6388 JA |
50 | /* */ |
51 | /* **************************************************************** */ | |
52 | ||
53 | /* Non-zero means automatically mark variables which are modified or created | |
54 | as auto export variables. */ | |
55 | int mark_modified_vars = 0; | |
56 | ||
57 | /* Non-zero causes asynchronous job notification. Otherwise, job state | |
58 | notification only takes place just before a primary prompt is printed. */ | |
59 | int asynchronous_notification = 0; | |
60 | ||
61 | /* Non-zero means exit immediately if a command exits with a non-zero | |
62 | exit status. */ | |
63 | int exit_immediately_on_error = 0; | |
64 | ||
65 | /* Non-zero means disable filename globbing. */ | |
66 | int disallow_filename_globbing = 0; | |
67 | ||
726f6388 JA |
68 | /* Non-zero means that all keyword arguments are placed into the environment |
69 | for a command, not just those that appear on the line before the command | |
70 | name. */ | |
71 | int place_keywords_in_env = 0; | |
72 | ||
ccc6cda3 | 73 | /* Non-zero means read commands, but don't execute them. This is useful |
726f6388 | 74 | for debugging shell scripts that should do something hairy and possibly |
f73dda09 | 75 | destructive. */ |
726f6388 JA |
76 | int read_but_dont_execute = 0; |
77 | ||
78 | /* Non-zero means end of file is after one command. */ | |
79 | int just_one_command = 0; | |
80 | ||
81 | /* Non-zero means don't overwrite existing files while doing redirections. */ | |
82 | int noclobber = 0; | |
83 | ||
84 | /* Non-zero means trying to get the value of $i where $i is undefined | |
85 | causes an error, instead of a null substitution. */ | |
86 | int unbound_vars_is_error = 0; | |
87 | ||
88 | /* Non-zero means type out input lines after you read them. */ | |
89 | int echo_input_at_read = 0; | |
90 | ||
91 | /* Non-zero means type out the command definition after reading, but | |
92 | before executing. */ | |
93 | int echo_command_at_execute = 0; | |
94 | ||
95 | /* Non-zero means turn on the job control features. */ | |
96 | int jobs_m_flag = 0; | |
97 | ||
98 | /* Non-zero means this shell is interactive, even if running under a | |
99 | pipe. */ | |
100 | int forced_interactive = 0; | |
101 | ||
102 | /* By default, follow the symbolic links as if they were real directories | |
103 | while hacking the `cd' command. This means that `cd ..' moves up in | |
104 | the string of symbolic links that make up the current directory, instead | |
105 | of the absolute directory. The shell variable `nolinks' also controls | |
106 | this flag. */ | |
107 | int no_symbolic_links = 0; | |
108 | ||
109 | /* **************************************************************** */ | |
110 | /* */ | |
111 | /* Non-Standard Flags Follow Here. */ | |
112 | /* */ | |
113 | /* **************************************************************** */ | |
114 | ||
ccc6cda3 | 115 | #if 0 |
726f6388 JA |
116 | /* Non-zero means do lexical scoping in the body of a FOR command. */ |
117 | int lexical_scoping = 0; | |
ccc6cda3 | 118 | #endif |
726f6388 JA |
119 | |
120 | /* Non-zero means no such thing as invisible variables. */ | |
121 | int no_invisible_vars = 0; | |
122 | ||
ccc6cda3 JA |
123 | /* Non-zero means look up and remember command names in a hash table, */ |
124 | int hashing_enabled = 1; | |
726f6388 JA |
125 | |
126 | #if defined (BANG_HISTORY) | |
127 | /* Non-zero means that we are doing history expansion. The default. | |
128 | This means !22 gets the 22nd line of history. */ | |
77638cbf CR |
129 | # if defined (STRICT_POSIX) |
130 | int history_expansion = 0; | |
131 | # else | |
726f6388 | 132 | int history_expansion = 1; |
77638cbf | 133 | # endif |
726f6388 JA |
134 | #endif /* BANG_HISTORY */ |
135 | ||
136 | /* Non-zero means that we allow comments to appear in interactive commands. */ | |
726f6388 | 137 | int interactive_comments = 1; |
726f6388 JA |
138 | |
139 | #if defined (RESTRICTED_SHELL) | |
140 | /* Non-zero means that this shell is `restricted'. A restricted shell | |
141 | disallows: changing directories, command or path names containing `/', | |
142 | unsetting or resetting the values of $PATH and $SHELL, and any type of | |
143 | output redirection. */ | |
b72432fd JA |
144 | int restricted = 0; /* currently restricted */ |
145 | int restricted_shell = 0; /* shell was started in restricted mode. */ | |
726f6388 JA |
146 | #endif /* RESTRICTED_SHELL */ |
147 | ||
148 | /* Non-zero means that this shell is running in `privileged' mode. This | |
e8ce775d JA |
149 | is required if the shell is to run setuid. If the `-p' option is |
150 | not supplied at startup, and the real and effective uids or gids | |
151 | differ, disable_priv_mode is called to relinquish setuid status. */ | |
726f6388 JA |
152 | int privileged_mode = 0; |
153 | ||
ccc6cda3 JA |
154 | #if defined (BRACE_EXPANSION) |
155 | /* Zero means to disable brace expansion: foo{a,b} -> fooa foob */ | |
156 | int brace_expansion = 1; | |
157 | #endif | |
158 | ||
d3a24ed2 CR |
159 | /* Non-zero means that shell functions inherit the DEBUG trap. */ |
160 | int function_trace_mode = 0; | |
161 | ||
162 | /* Non-zero means that shell functions inherit the ERR trap. */ | |
163 | int error_trace_mode = 0; | |
164 | ||
165 | /* Non-zero means that the rightmost non-zero exit status in a pipeline | |
166 | is the exit status of the entire pipeline. If each processes exits | |
167 | with a 0 status, the status of the pipeline is 0. */ | |
168 | int pipefail_opt = 0; | |
169 | ||
726f6388 JA |
170 | /* **************************************************************** */ |
171 | /* */ | |
172 | /* The Flags ALIST. */ | |
173 | /* */ | |
174 | /* **************************************************************** */ | |
175 | ||
d3ad40de | 176 | const struct flags_alist shell_flags[] = { |
726f6388 JA |
177 | /* Standard sh flags. */ |
178 | { 'a', &mark_modified_vars }, | |
179 | #if defined (JOB_CONTROL) | |
180 | { 'b', &asynchronous_notification }, | |
181 | #endif /* JOB_CONTROL */ | |
182 | { 'e', &exit_immediately_on_error }, | |
183 | { 'f', &disallow_filename_globbing }, | |
ccc6cda3 | 184 | { 'h', &hashing_enabled }, |
726f6388 JA |
185 | { 'i', &forced_interactive }, |
186 | { 'k', &place_keywords_in_env }, | |
187 | #if defined (JOB_CONTROL) | |
188 | { 'm', &jobs_m_flag }, | |
189 | #endif /* JOB_CONTROL */ | |
190 | { 'n', &read_but_dont_execute }, | |
191 | { 'p', &privileged_mode }, | |
192 | #if defined (RESTRICTED_SHELL) | |
193 | { 'r', &restricted }, | |
194 | #endif /* RESTRICTED_SHELL */ | |
195 | { 't', &just_one_command }, | |
196 | { 'u', &unbound_vars_is_error }, | |
197 | { 'v', &echo_input_at_read }, | |
198 | { 'x', &echo_command_at_execute }, | |
726f6388 JA |
199 | |
200 | /* New flags that control non-standard things. */ | |
ccc6cda3 | 201 | #if 0 |
726f6388 | 202 | { 'l', &lexical_scoping }, |
ccc6cda3 | 203 | #endif |
ccc6cda3 JA |
204 | #if defined (BRACE_EXPANSION) |
205 | { 'B', &brace_expansion }, | |
206 | #endif | |
d3a24ed2 CR |
207 | { 'C', &noclobber }, |
208 | { 'E', &error_trace_mode }, | |
726f6388 | 209 | #if defined (BANG_HISTORY) |
726f6388 JA |
210 | { 'H', &history_expansion }, |
211 | #endif /* BANG_HISTORY */ | |
d3a24ed2 CR |
212 | { 'I', &no_invisible_vars }, |
213 | { 'P', &no_symbolic_links }, | |
214 | { 'T', &function_trace_mode }, | |
726f6388 JA |
215 | {0, (int *)NULL} |
216 | }; | |
217 | ||
218 | #define NUM_SHELL_FLAGS (sizeof (shell_flags) / sizeof (struct flags_alist)) | |
219 | ||
7117c2d2 JA |
220 | char optflags[NUM_SHELL_FLAGS+4] = { '+' }; |
221 | ||
726f6388 JA |
222 | int * |
223 | find_flag (name) | |
224 | int name; | |
225 | { | |
ccc6cda3 JA |
226 | int i; |
227 | for (i = 0; shell_flags[i].name; i++) | |
726f6388 JA |
228 | { |
229 | if (shell_flags[i].name == name) | |
230 | return (shell_flags[i].value); | |
726f6388 JA |
231 | } |
232 | return (FLAG_UNKNOWN); | |
233 | } | |
234 | ||
235 | /* Change the state of a flag, and return it's original value, or return | |
cce855bc JA |
236 | FLAG_ERROR if there is no flag FLAG. ON_OR_OFF must be either |
237 | FLAG_ON or FLAG_OFF. */ | |
726f6388 JA |
238 | int |
239 | change_flag (flag, on_or_off) | |
240 | int flag; | |
241 | int on_or_off; | |
242 | { | |
ccc6cda3 JA |
243 | int *value, old_value; |
244 | ||
726f6388 JA |
245 | #if defined (RESTRICTED_SHELL) |
246 | /* Don't allow "set +r" in a shell which is `restricted'. */ | |
247 | if (restricted && flag == 'r' && on_or_off == FLAG_OFF) | |
248 | return (FLAG_ERROR); | |
249 | #endif /* RESTRICTED_SHELL */ | |
250 | ||
bb70624e JA |
251 | value = find_flag (flag); |
252 | ||
cce855bc | 253 | if ((value == (int *)FLAG_UNKNOWN) || (on_or_off != FLAG_ON && on_or_off != FLAG_OFF)) |
726f6388 | 254 | return (FLAG_ERROR); |
ccc6cda3 JA |
255 | |
256 | old_value = *value; | |
cce855bc | 257 | *value = (on_or_off == FLAG_ON) ? 1 : 0; |
726f6388 JA |
258 | |
259 | /* Special cases for a few flags. */ | |
260 | switch (flag) | |
261 | { | |
f73dda09 JA |
262 | #if defined (BANG_HISTORY) |
263 | case 'H': | |
264 | if (on_or_off == FLAG_ON) | |
265 | bash_initialize_history (); | |
266 | break; | |
267 | #endif | |
268 | ||
726f6388 JA |
269 | #if defined (JOB_CONTROL) |
270 | case 'm': | |
d166f048 | 271 | set_job_control (on_or_off == FLAG_ON); |
726f6388 JA |
272 | break; |
273 | #endif /* JOB_CONTROL */ | |
274 | ||
f73dda09 JA |
275 | case 'n': |
276 | if (interactive_shell) | |
277 | read_but_dont_execute = 0; | |
d166f048 | 278 | break; |
d166f048 | 279 | |
726f6388 | 280 | case 'p': |
d166f048 | 281 | if (on_or_off == FLAG_OFF) |
ccc6cda3 | 282 | disable_priv_mode (); |
f73dda09 | 283 | break; |
ccc6cda3 | 284 | |
f73dda09 JA |
285 | #if defined (RESTRICTED_SHELL) |
286 | case 'r': | |
a5e25162 | 287 | if (on_or_off == FLAG_ON && shell_initialized) |
f73dda09 | 288 | maybe_make_restricted (shell_name); |
726f6388 | 289 | break; |
f73dda09 JA |
290 | #endif |
291 | ||
726f6388 | 292 | } |
ccc6cda3 | 293 | |
726f6388 JA |
294 | return (old_value); |
295 | } | |
296 | ||
297 | /* Return a string which is the names of all the currently | |
298 | set shell flags. */ | |
299 | char * | |
300 | which_set_flags () | |
301 | { | |
ccc6cda3 JA |
302 | char *temp; |
303 | int i, string_index; | |
726f6388 | 304 | |
f73dda09 | 305 | temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS + read_from_stdin + want_pending_command); |
ccc6cda3 | 306 | for (i = string_index = 0; shell_flags[i].name; i++) |
726f6388 JA |
307 | if (*(shell_flags[i].value)) |
308 | temp[string_index++] = shell_flags[i].name; | |
309 | ||
bb70624e JA |
310 | if (want_pending_command) |
311 | temp[string_index++] = 'c'; | |
312 | if (read_from_stdin) | |
313 | temp[string_index++] = 's'; | |
314 | ||
726f6388 JA |
315 | temp[string_index] = '\0'; |
316 | return (temp); | |
317 | } | |
d166f048 JA |
318 | |
319 | void | |
320 | reset_shell_flags () | |
321 | { | |
322 | mark_modified_vars = exit_immediately_on_error = disallow_filename_globbing = 0; | |
323 | place_keywords_in_env = read_but_dont_execute = just_one_command = 0; | |
324 | noclobber = unbound_vars_is_error = echo_input_at_read = 0; | |
325 | echo_command_at_execute = jobs_m_flag = forced_interactive = 0; | |
d3a24ed2 | 326 | no_symbolic_links = no_invisible_vars = privileged_mode = pipefail_opt = 0; |
d166f048 JA |
327 | |
328 | hashing_enabled = interactive_comments = 1; | |
329 | ||
330 | #if defined (JOB_CONTROL) | |
331 | asynchronous_notification = 0; | |
332 | #endif | |
333 | ||
334 | #if defined (BANG_HISTORY) | |
335 | history_expansion = 1; | |
336 | #endif | |
337 | ||
338 | #if defined (BRACE_EXPANSION) | |
339 | brace_expansion = 1; | |
340 | #endif | |
341 | ||
342 | #if defined (RESTRICTED_SHELL) | |
343 | restricted = 0; | |
344 | #endif | |
345 | } | |
7117c2d2 JA |
346 | |
347 | void | |
348 | initialize_flags () | |
349 | { | |
350 | register int i; | |
351 | ||
352 | for (i = 0; shell_flags[i].name; i++) | |
353 | optflags[i+1] = shell_flags[i].name; | |
354 | optflags[++i] = 'o'; | |
355 | optflags[++i] = ';'; | |
356 | optflags[i+1] = '\0'; | |
357 | } |