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726f6388 JA |
1 | /* flags.c -- Everything about flags except the `set' command. That |
2 | is in builtins.c */ | |
3 | ||
3185942a | 4 | /* Copyright (C) 1987-2009 Free Software Foundation, Inc. |
726f6388 | 5 | |
3185942a | 6 | This file is part of GNU Bash, the Bourne Again SHell. |
726f6388 | 7 | |
3185942a JA |
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 | |
3185942a JA |
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 | |
3185942a JA |
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 | ||
b80f6443 | 42 | extern int shell_initialized; |
ac50fbac | 43 | extern int builtin_ignoring_errexit; |
b80f6443 | 44 | |
bb70624e JA |
45 | /* -c, -s invocation options -- not really flags, but they show up in $- */ |
46 | extern int want_pending_command, read_from_stdin; | |
47 | ||
726f6388 JA |
48 | /* **************************************************************** */ |
49 | /* */ | |
3185942a | 50 | /* The Standard sh Flags. */ |
726f6388 JA |
51 | /* */ |
52 | /* **************************************************************** */ | |
53 | ||
54 | /* Non-zero means automatically mark variables which are modified or created | |
55 | as auto export variables. */ | |
56 | int mark_modified_vars = 0; | |
57 | ||
58 | /* Non-zero causes asynchronous job notification. Otherwise, job state | |
59 | notification only takes place just before a primary prompt is printed. */ | |
60 | int asynchronous_notification = 0; | |
61 | ||
62 | /* Non-zero means exit immediately if a command exits with a non-zero | |
ac50fbac CR |
63 | exit status. The first is what controls set -e; the second is what |
64 | bash uses internally. */ | |
65 | int errexit_flag = 0; | |
726f6388 JA |
66 | int exit_immediately_on_error = 0; |
67 | ||
68 | /* Non-zero means disable filename globbing. */ | |
69 | int disallow_filename_globbing = 0; | |
70 | ||
726f6388 JA |
71 | /* Non-zero means that all keyword arguments are placed into the environment |
72 | for a command, not just those that appear on the line before the command | |
73 | name. */ | |
74 | int place_keywords_in_env = 0; | |
75 | ||
ccc6cda3 | 76 | /* Non-zero means read commands, but don't execute them. This is useful |
726f6388 | 77 | for debugging shell scripts that should do something hairy and possibly |
f73dda09 | 78 | destructive. */ |
726f6388 JA |
79 | int read_but_dont_execute = 0; |
80 | ||
81 | /* Non-zero means end of file is after one command. */ | |
82 | int just_one_command = 0; | |
83 | ||
84 | /* Non-zero means don't overwrite existing files while doing redirections. */ | |
85 | int noclobber = 0; | |
86 | ||
87 | /* Non-zero means trying to get the value of $i where $i is undefined | |
88 | causes an error, instead of a null substitution. */ | |
89 | int unbound_vars_is_error = 0; | |
90 | ||
91 | /* Non-zero means type out input lines after you read them. */ | |
92 | int echo_input_at_read = 0; | |
93 | ||
94 | /* Non-zero means type out the command definition after reading, but | |
95 | before executing. */ | |
96 | int echo_command_at_execute = 0; | |
97 | ||
98 | /* Non-zero means turn on the job control features. */ | |
99 | int jobs_m_flag = 0; | |
100 | ||
101 | /* Non-zero means this shell is interactive, even if running under a | |
102 | pipe. */ | |
103 | int forced_interactive = 0; | |
104 | ||
105 | /* By default, follow the symbolic links as if they were real directories | |
106 | while hacking the `cd' command. This means that `cd ..' moves up in | |
107 | the string of symbolic links that make up the current directory, instead | |
108 | of the absolute directory. The shell variable `nolinks' also controls | |
109 | this flag. */ | |
110 | int no_symbolic_links = 0; | |
111 | ||
112 | /* **************************************************************** */ | |
113 | /* */ | |
114 | /* Non-Standard Flags Follow Here. */ | |
115 | /* */ | |
116 | /* **************************************************************** */ | |
117 | ||
ccc6cda3 | 118 | #if 0 |
726f6388 JA |
119 | /* Non-zero means do lexical scoping in the body of a FOR command. */ |
120 | int lexical_scoping = 0; | |
ccc6cda3 | 121 | #endif |
726f6388 JA |
122 | |
123 | /* Non-zero means no such thing as invisible variables. */ | |
124 | int no_invisible_vars = 0; | |
125 | ||
ccc6cda3 JA |
126 | /* Non-zero means look up and remember command names in a hash table, */ |
127 | int hashing_enabled = 1; | |
726f6388 JA |
128 | |
129 | #if defined (BANG_HISTORY) | |
130 | /* Non-zero means that we are doing history expansion. The default. | |
131 | This means !22 gets the 22nd line of history. */ | |
ac50fbac CR |
132 | # if defined (STRICT_POSIX) |
133 | int history_expansion = 0; | |
134 | # else | |
726f6388 | 135 | int history_expansion = 1; |
ac50fbac | 136 | # endif |
726f6388 JA |
137 | #endif /* BANG_HISTORY */ |
138 | ||
139 | /* Non-zero means that we allow comments to appear in interactive commands. */ | |
726f6388 | 140 | int interactive_comments = 1; |
726f6388 JA |
141 | |
142 | #if defined (RESTRICTED_SHELL) | |
143 | /* Non-zero means that this shell is `restricted'. A restricted shell | |
144 | disallows: changing directories, command or path names containing `/', | |
145 | unsetting or resetting the values of $PATH and $SHELL, and any type of | |
146 | output redirection. */ | |
b72432fd JA |
147 | int restricted = 0; /* currently restricted */ |
148 | int restricted_shell = 0; /* shell was started in restricted mode. */ | |
726f6388 JA |
149 | #endif /* RESTRICTED_SHELL */ |
150 | ||
151 | /* Non-zero means that this shell is running in `privileged' mode. This | |
e8ce775d JA |
152 | is required if the shell is to run setuid. If the `-p' option is |
153 | not supplied at startup, and the real and effective uids or gids | |
154 | differ, disable_priv_mode is called to relinquish setuid status. */ | |
726f6388 JA |
155 | int privileged_mode = 0; |
156 | ||
ccc6cda3 JA |
157 | #if defined (BRACE_EXPANSION) |
158 | /* Zero means to disable brace expansion: foo{a,b} -> fooa foob */ | |
159 | int brace_expansion = 1; | |
160 | #endif | |
161 | ||
b80f6443 JA |
162 | /* Non-zero means that shell functions inherit the DEBUG trap. */ |
163 | int function_trace_mode = 0; | |
164 | ||
165 | /* Non-zero means that shell functions inherit the ERR trap. */ | |
166 | int error_trace_mode = 0; | |
167 | ||
168 | /* Non-zero means that the rightmost non-zero exit status in a pipeline | |
169 | is the exit status of the entire pipeline. If each processes exits | |
170 | with a 0 status, the status of the pipeline is 0. */ | |
171 | int pipefail_opt = 0; | |
172 | ||
726f6388 JA |
173 | /* **************************************************************** */ |
174 | /* */ | |
175 | /* The Flags ALIST. */ | |
176 | /* */ | |
177 | /* **************************************************************** */ | |
178 | ||
3185942a | 179 | const struct flags_alist shell_flags[] = { |
726f6388 JA |
180 | /* Standard sh flags. */ |
181 | { 'a', &mark_modified_vars }, | |
182 | #if defined (JOB_CONTROL) | |
183 | { 'b', &asynchronous_notification }, | |
184 | #endif /* JOB_CONTROL */ | |
ac50fbac | 185 | { 'e', &errexit_flag }, |
726f6388 | 186 | { 'f', &disallow_filename_globbing }, |
ccc6cda3 | 187 | { 'h', &hashing_enabled }, |
726f6388 JA |
188 | { 'i', &forced_interactive }, |
189 | { 'k', &place_keywords_in_env }, | |
190 | #if defined (JOB_CONTROL) | |
191 | { 'm', &jobs_m_flag }, | |
192 | #endif /* JOB_CONTROL */ | |
193 | { 'n', &read_but_dont_execute }, | |
194 | { 'p', &privileged_mode }, | |
195 | #if defined (RESTRICTED_SHELL) | |
196 | { 'r', &restricted }, | |
197 | #endif /* RESTRICTED_SHELL */ | |
198 | { 't', &just_one_command }, | |
199 | { 'u', &unbound_vars_is_error }, | |
200 | { 'v', &echo_input_at_read }, | |
201 | { 'x', &echo_command_at_execute }, | |
726f6388 JA |
202 | |
203 | /* New flags that control non-standard things. */ | |
ccc6cda3 | 204 | #if 0 |
726f6388 | 205 | { 'l', &lexical_scoping }, |
ccc6cda3 | 206 | #endif |
ccc6cda3 JA |
207 | #if defined (BRACE_EXPANSION) |
208 | { 'B', &brace_expansion }, | |
209 | #endif | |
b80f6443 JA |
210 | { 'C', &noclobber }, |
211 | { 'E', &error_trace_mode }, | |
726f6388 | 212 | #if defined (BANG_HISTORY) |
726f6388 JA |
213 | { 'H', &history_expansion }, |
214 | #endif /* BANG_HISTORY */ | |
b80f6443 JA |
215 | { 'I', &no_invisible_vars }, |
216 | { 'P', &no_symbolic_links }, | |
217 | { 'T', &function_trace_mode }, | |
726f6388 JA |
218 | {0, (int *)NULL} |
219 | }; | |
220 | ||
221 | #define NUM_SHELL_FLAGS (sizeof (shell_flags) / sizeof (struct flags_alist)) | |
222 | ||
7117c2d2 JA |
223 | char optflags[NUM_SHELL_FLAGS+4] = { '+' }; |
224 | ||
726f6388 JA |
225 | int * |
226 | find_flag (name) | |
227 | int name; | |
228 | { | |
ccc6cda3 JA |
229 | int i; |
230 | for (i = 0; shell_flags[i].name; i++) | |
726f6388 JA |
231 | { |
232 | if (shell_flags[i].name == name) | |
233 | return (shell_flags[i].value); | |
726f6388 JA |
234 | } |
235 | return (FLAG_UNKNOWN); | |
236 | } | |
237 | ||
238 | /* Change the state of a flag, and return it's original value, or return | |
cce855bc JA |
239 | FLAG_ERROR if there is no flag FLAG. ON_OR_OFF must be either |
240 | FLAG_ON or FLAG_OFF. */ | |
726f6388 JA |
241 | int |
242 | change_flag (flag, on_or_off) | |
243 | int flag; | |
244 | int on_or_off; | |
245 | { | |
ccc6cda3 JA |
246 | int *value, old_value; |
247 | ||
726f6388 JA |
248 | #if defined (RESTRICTED_SHELL) |
249 | /* Don't allow "set +r" in a shell which is `restricted'. */ | |
250 | if (restricted && flag == 'r' && on_or_off == FLAG_OFF) | |
251 | return (FLAG_ERROR); | |
252 | #endif /* RESTRICTED_SHELL */ | |
253 | ||
bb70624e JA |
254 | value = find_flag (flag); |
255 | ||
cce855bc | 256 | if ((value == (int *)FLAG_UNKNOWN) || (on_or_off != FLAG_ON && on_or_off != FLAG_OFF)) |
726f6388 | 257 | return (FLAG_ERROR); |
ccc6cda3 JA |
258 | |
259 | old_value = *value; | |
cce855bc | 260 | *value = (on_or_off == FLAG_ON) ? 1 : 0; |
726f6388 JA |
261 | |
262 | /* Special cases for a few flags. */ | |
263 | switch (flag) | |
264 | { | |
f73dda09 JA |
265 | #if defined (BANG_HISTORY) |
266 | case 'H': | |
267 | if (on_or_off == FLAG_ON) | |
268 | bash_initialize_history (); | |
269 | break; | |
270 | #endif | |
271 | ||
726f6388 JA |
272 | #if defined (JOB_CONTROL) |
273 | case 'm': | |
d166f048 | 274 | set_job_control (on_or_off == FLAG_ON); |
726f6388 JA |
275 | break; |
276 | #endif /* JOB_CONTROL */ | |
277 | ||
ac50fbac CR |
278 | case 'e': |
279 | if (builtin_ignoring_errexit == 0) | |
280 | exit_immediately_on_error = errexit_flag; | |
281 | break; | |
282 | ||
f73dda09 JA |
283 | case 'n': |
284 | if (interactive_shell) | |
285 | read_but_dont_execute = 0; | |
d166f048 | 286 | break; |
d166f048 | 287 | |
726f6388 | 288 | case 'p': |
d166f048 | 289 | if (on_or_off == FLAG_OFF) |
ccc6cda3 | 290 | disable_priv_mode (); |
f73dda09 | 291 | break; |
ccc6cda3 | 292 | |
f73dda09 JA |
293 | #if defined (RESTRICTED_SHELL) |
294 | case 'r': | |
b80f6443 | 295 | if (on_or_off == FLAG_ON && shell_initialized) |
f73dda09 | 296 | maybe_make_restricted (shell_name); |
726f6388 | 297 | break; |
f73dda09 JA |
298 | #endif |
299 | ||
726f6388 | 300 | } |
ccc6cda3 | 301 | |
726f6388 JA |
302 | return (old_value); |
303 | } | |
304 | ||
305 | /* Return a string which is the names of all the currently | |
306 | set shell flags. */ | |
307 | char * | |
308 | which_set_flags () | |
309 | { | |
ccc6cda3 JA |
310 | char *temp; |
311 | int i, string_index; | |
726f6388 | 312 | |
f73dda09 | 313 | temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS + read_from_stdin + want_pending_command); |
ccc6cda3 | 314 | for (i = string_index = 0; shell_flags[i].name; i++) |
726f6388 JA |
315 | if (*(shell_flags[i].value)) |
316 | temp[string_index++] = shell_flags[i].name; | |
317 | ||
bb70624e JA |
318 | if (want_pending_command) |
319 | temp[string_index++] = 'c'; | |
320 | if (read_from_stdin) | |
321 | temp[string_index++] = 's'; | |
322 | ||
726f6388 JA |
323 | temp[string_index] = '\0'; |
324 | return (temp); | |
325 | } | |
d166f048 JA |
326 | |
327 | void | |
328 | reset_shell_flags () | |
329 | { | |
330 | mark_modified_vars = exit_immediately_on_error = disallow_filename_globbing = 0; | |
331 | place_keywords_in_env = read_but_dont_execute = just_one_command = 0; | |
332 | noclobber = unbound_vars_is_error = echo_input_at_read = 0; | |
333 | echo_command_at_execute = jobs_m_flag = forced_interactive = 0; | |
b80f6443 | 334 | no_symbolic_links = no_invisible_vars = privileged_mode = pipefail_opt = 0; |
d166f048 JA |
335 | |
336 | hashing_enabled = interactive_comments = 1; | |
337 | ||
338 | #if defined (JOB_CONTROL) | |
339 | asynchronous_notification = 0; | |
340 | #endif | |
341 | ||
342 | #if defined (BANG_HISTORY) | |
343 | history_expansion = 1; | |
344 | #endif | |
345 | ||
346 | #if defined (BRACE_EXPANSION) | |
347 | brace_expansion = 1; | |
348 | #endif | |
349 | ||
350 | #if defined (RESTRICTED_SHELL) | |
351 | restricted = 0; | |
352 | #endif | |
353 | } | |
7117c2d2 JA |
354 | |
355 | void | |
356 | initialize_flags () | |
357 | { | |
358 | register int i; | |
359 | ||
360 | for (i = 0; shell_flags[i].name; i++) | |
361 | optflags[i+1] = shell_flags[i].name; | |
362 | optflags[++i] = 'o'; | |
363 | optflags[++i] = ';'; | |
364 | optflags[i+1] = '\0'; | |
365 | } |