]>
Commit | Line | Data |
---|---|---|
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 | ||
f73dda09 JA |
31 | #if defined (BANG_HISTORY) |
32 | # include "bashhist.h" | |
33 | #endif | |
34 | ||
ccc6cda3 | 35 | #if defined (JOB_CONTROL) |
f73dda09 | 36 | extern int set_job_control __P((int)); |
ccc6cda3 JA |
37 | #endif |
38 | ||
d166f048 JA |
39 | #if defined (RESTRICTED_SHELL) |
40 | extern char *shell_name; | |
41 | #endif | |
42 | ||
b80f6443 JA |
43 | extern int shell_initialized; |
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 | /* */ | |
50 | /* The Standard Sh Flags. */ | |
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 | |
63 | exit status. */ | |
64 | int exit_immediately_on_error = 0; | |
65 | ||
66 | /* Non-zero means disable filename globbing. */ | |
67 | int disallow_filename_globbing = 0; | |
68 | ||
726f6388 JA |
69 | /* Non-zero means that all keyword arguments are placed into the environment |
70 | for a command, not just those that appear on the line before the command | |
71 | name. */ | |
72 | int place_keywords_in_env = 0; | |
73 | ||
ccc6cda3 | 74 | /* Non-zero means read commands, but don't execute them. This is useful |
726f6388 | 75 | for debugging shell scripts that should do something hairy and possibly |
f73dda09 | 76 | destructive. */ |
726f6388 JA |
77 | int read_but_dont_execute = 0; |
78 | ||
79 | /* Non-zero means end of file is after one command. */ | |
80 | int just_one_command = 0; | |
81 | ||
82 | /* Non-zero means don't overwrite existing files while doing redirections. */ | |
83 | int noclobber = 0; | |
84 | ||
85 | /* Non-zero means trying to get the value of $i where $i is undefined | |
86 | causes an error, instead of a null substitution. */ | |
87 | int unbound_vars_is_error = 0; | |
88 | ||
89 | /* Non-zero means type out input lines after you read them. */ | |
90 | int echo_input_at_read = 0; | |
91 | ||
92 | /* Non-zero means type out the command definition after reading, but | |
93 | before executing. */ | |
94 | int echo_command_at_execute = 0; | |
95 | ||
96 | /* Non-zero means turn on the job control features. */ | |
97 | int jobs_m_flag = 0; | |
98 | ||
99 | /* Non-zero means this shell is interactive, even if running under a | |
100 | pipe. */ | |
101 | int forced_interactive = 0; | |
102 | ||
103 | /* By default, follow the symbolic links as if they were real directories | |
104 | while hacking the `cd' command. This means that `cd ..' moves up in | |
105 | the string of symbolic links that make up the current directory, instead | |
106 | of the absolute directory. The shell variable `nolinks' also controls | |
107 | this flag. */ | |
108 | int no_symbolic_links = 0; | |
109 | ||
110 | /* **************************************************************** */ | |
111 | /* */ | |
112 | /* Non-Standard Flags Follow Here. */ | |
113 | /* */ | |
114 | /* **************************************************************** */ | |
115 | ||
ccc6cda3 | 116 | #if 0 |
726f6388 JA |
117 | /* Non-zero means do lexical scoping in the body of a FOR command. */ |
118 | int lexical_scoping = 0; | |
ccc6cda3 | 119 | #endif |
726f6388 JA |
120 | |
121 | /* Non-zero means no such thing as invisible variables. */ | |
122 | int no_invisible_vars = 0; | |
123 | ||
ccc6cda3 JA |
124 | /* Non-zero means look up and remember command names in a hash table, */ |
125 | int hashing_enabled = 1; | |
726f6388 JA |
126 | |
127 | #if defined (BANG_HISTORY) | |
128 | /* Non-zero means that we are doing history expansion. The default. | |
129 | This means !22 gets the 22nd line of history. */ | |
130 | int history_expansion = 1; | |
131 | #endif /* BANG_HISTORY */ | |
132 | ||
133 | /* Non-zero means that we allow comments to appear in interactive commands. */ | |
726f6388 | 134 | int interactive_comments = 1; |
726f6388 JA |
135 | |
136 | #if defined (RESTRICTED_SHELL) | |
137 | /* Non-zero means that this shell is `restricted'. A restricted shell | |
138 | disallows: changing directories, command or path names containing `/', | |
139 | unsetting or resetting the values of $PATH and $SHELL, and any type of | |
140 | output redirection. */ | |
b72432fd JA |
141 | int restricted = 0; /* currently restricted */ |
142 | int restricted_shell = 0; /* shell was started in restricted mode. */ | |
726f6388 JA |
143 | #endif /* RESTRICTED_SHELL */ |
144 | ||
145 | /* Non-zero means that this shell is running in `privileged' mode. This | |
e8ce775d JA |
146 | is required if the shell is to run setuid. If the `-p' option is |
147 | not supplied at startup, and the real and effective uids or gids | |
148 | differ, disable_priv_mode is called to relinquish setuid status. */ | |
726f6388 JA |
149 | int privileged_mode = 0; |
150 | ||
ccc6cda3 JA |
151 | #if defined (BRACE_EXPANSION) |
152 | /* Zero means to disable brace expansion: foo{a,b} -> fooa foob */ | |
153 | int brace_expansion = 1; | |
154 | #endif | |
155 | ||
b80f6443 JA |
156 | /* Non-zero means that shell functions inherit the DEBUG trap. */ |
157 | int function_trace_mode = 0; | |
158 | ||
159 | /* Non-zero means that shell functions inherit the ERR trap. */ | |
160 | int error_trace_mode = 0; | |
161 | ||
162 | /* Non-zero means that the rightmost non-zero exit status in a pipeline | |
163 | is the exit status of the entire pipeline. If each processes exits | |
164 | with a 0 status, the status of the pipeline is 0. */ | |
165 | int pipefail_opt = 0; | |
166 | ||
726f6388 JA |
167 | /* **************************************************************** */ |
168 | /* */ | |
169 | /* The Flags ALIST. */ | |
170 | /* */ | |
171 | /* **************************************************************** */ | |
172 | ||
173 | struct flags_alist shell_flags[] = { | |
174 | /* Standard sh flags. */ | |
175 | { 'a', &mark_modified_vars }, | |
176 | #if defined (JOB_CONTROL) | |
177 | { 'b', &asynchronous_notification }, | |
178 | #endif /* JOB_CONTROL */ | |
179 | { 'e', &exit_immediately_on_error }, | |
180 | { 'f', &disallow_filename_globbing }, | |
ccc6cda3 | 181 | { 'h', &hashing_enabled }, |
726f6388 JA |
182 | { 'i', &forced_interactive }, |
183 | { 'k', &place_keywords_in_env }, | |
184 | #if defined (JOB_CONTROL) | |
185 | { 'm', &jobs_m_flag }, | |
186 | #endif /* JOB_CONTROL */ | |
187 | { 'n', &read_but_dont_execute }, | |
188 | { 'p', &privileged_mode }, | |
189 | #if defined (RESTRICTED_SHELL) | |
190 | { 'r', &restricted }, | |
191 | #endif /* RESTRICTED_SHELL */ | |
192 | { 't', &just_one_command }, | |
193 | { 'u', &unbound_vars_is_error }, | |
194 | { 'v', &echo_input_at_read }, | |
195 | { 'x', &echo_command_at_execute }, | |
726f6388 JA |
196 | |
197 | /* New flags that control non-standard things. */ | |
ccc6cda3 | 198 | #if 0 |
726f6388 | 199 | { 'l', &lexical_scoping }, |
ccc6cda3 | 200 | #endif |
ccc6cda3 JA |
201 | #if defined (BRACE_EXPANSION) |
202 | { 'B', &brace_expansion }, | |
203 | #endif | |
b80f6443 JA |
204 | { 'C', &noclobber }, |
205 | { 'E', &error_trace_mode }, | |
726f6388 | 206 | #if defined (BANG_HISTORY) |
726f6388 JA |
207 | { 'H', &history_expansion }, |
208 | #endif /* BANG_HISTORY */ | |
b80f6443 JA |
209 | { 'I', &no_invisible_vars }, |
210 | { 'P', &no_symbolic_links }, | |
211 | { 'T', &function_trace_mode }, | |
726f6388 JA |
212 | {0, (int *)NULL} |
213 | }; | |
214 | ||
215 | #define NUM_SHELL_FLAGS (sizeof (shell_flags) / sizeof (struct flags_alist)) | |
216 | ||
7117c2d2 JA |
217 | char optflags[NUM_SHELL_FLAGS+4] = { '+' }; |
218 | ||
726f6388 JA |
219 | int * |
220 | find_flag (name) | |
221 | int name; | |
222 | { | |
ccc6cda3 JA |
223 | int i; |
224 | for (i = 0; shell_flags[i].name; i++) | |
726f6388 JA |
225 | { |
226 | if (shell_flags[i].name == name) | |
227 | return (shell_flags[i].value); | |
726f6388 JA |
228 | } |
229 | return (FLAG_UNKNOWN); | |
230 | } | |
231 | ||
232 | /* Change the state of a flag, and return it's original value, or return | |
cce855bc JA |
233 | FLAG_ERROR if there is no flag FLAG. ON_OR_OFF must be either |
234 | FLAG_ON or FLAG_OFF. */ | |
726f6388 JA |
235 | int |
236 | change_flag (flag, on_or_off) | |
237 | int flag; | |
238 | int on_or_off; | |
239 | { | |
ccc6cda3 JA |
240 | int *value, old_value; |
241 | ||
726f6388 JA |
242 | #if defined (RESTRICTED_SHELL) |
243 | /* Don't allow "set +r" in a shell which is `restricted'. */ | |
244 | if (restricted && flag == 'r' && on_or_off == FLAG_OFF) | |
245 | return (FLAG_ERROR); | |
246 | #endif /* RESTRICTED_SHELL */ | |
247 | ||
bb70624e JA |
248 | value = find_flag (flag); |
249 | ||
cce855bc | 250 | if ((value == (int *)FLAG_UNKNOWN) || (on_or_off != FLAG_ON && on_or_off != FLAG_OFF)) |
726f6388 | 251 | return (FLAG_ERROR); |
ccc6cda3 JA |
252 | |
253 | old_value = *value; | |
726f6388 | 254 | |
cce855bc | 255 | *value = (on_or_off == FLAG_ON) ? 1 : 0; |
726f6388 JA |
256 | |
257 | /* Special cases for a few flags. */ | |
258 | switch (flag) | |
259 | { | |
f73dda09 JA |
260 | #if defined (BANG_HISTORY) |
261 | case 'H': | |
262 | if (on_or_off == FLAG_ON) | |
263 | bash_initialize_history (); | |
264 | break; | |
265 | #endif | |
266 | ||
726f6388 JA |
267 | #if defined (JOB_CONTROL) |
268 | case 'm': | |
d166f048 | 269 | set_job_control (on_or_off == FLAG_ON); |
726f6388 JA |
270 | break; |
271 | #endif /* JOB_CONTROL */ | |
272 | ||
f73dda09 JA |
273 | case 'n': |
274 | if (interactive_shell) | |
275 | read_but_dont_execute = 0; | |
d166f048 | 276 | break; |
d166f048 | 277 | |
726f6388 | 278 | case 'p': |
d166f048 | 279 | if (on_or_off == FLAG_OFF) |
ccc6cda3 | 280 | disable_priv_mode (); |
f73dda09 | 281 | break; |
ccc6cda3 | 282 | |
f73dda09 JA |
283 | #if defined (RESTRICTED_SHELL) |
284 | case 'r': | |
b80f6443 | 285 | if (on_or_off == FLAG_ON && shell_initialized) |
f73dda09 | 286 | maybe_make_restricted (shell_name); |
726f6388 | 287 | break; |
f73dda09 JA |
288 | #endif |
289 | ||
726f6388 | 290 | } |
ccc6cda3 | 291 | |
726f6388 JA |
292 | return (old_value); |
293 | } | |
294 | ||
295 | /* Return a string which is the names of all the currently | |
296 | set shell flags. */ | |
297 | char * | |
298 | which_set_flags () | |
299 | { | |
ccc6cda3 JA |
300 | char *temp; |
301 | int i, string_index; | |
726f6388 | 302 | |
f73dda09 | 303 | temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS + read_from_stdin + want_pending_command); |
ccc6cda3 | 304 | for (i = string_index = 0; shell_flags[i].name; i++) |
726f6388 JA |
305 | if (*(shell_flags[i].value)) |
306 | temp[string_index++] = shell_flags[i].name; | |
307 | ||
bb70624e JA |
308 | if (want_pending_command) |
309 | temp[string_index++] = 'c'; | |
310 | if (read_from_stdin) | |
311 | temp[string_index++] = 's'; | |
312 | ||
726f6388 JA |
313 | temp[string_index] = '\0'; |
314 | return (temp); | |
315 | } | |
d166f048 JA |
316 | |
317 | void | |
318 | reset_shell_flags () | |
319 | { | |
320 | mark_modified_vars = exit_immediately_on_error = disallow_filename_globbing = 0; | |
321 | place_keywords_in_env = read_but_dont_execute = just_one_command = 0; | |
322 | noclobber = unbound_vars_is_error = echo_input_at_read = 0; | |
323 | echo_command_at_execute = jobs_m_flag = forced_interactive = 0; | |
b80f6443 | 324 | no_symbolic_links = no_invisible_vars = privileged_mode = pipefail_opt = 0; |
d166f048 JA |
325 | |
326 | hashing_enabled = interactive_comments = 1; | |
327 | ||
328 | #if defined (JOB_CONTROL) | |
329 | asynchronous_notification = 0; | |
330 | #endif | |
331 | ||
332 | #if defined (BANG_HISTORY) | |
333 | history_expansion = 1; | |
334 | #endif | |
335 | ||
336 | #if defined (BRACE_EXPANSION) | |
337 | brace_expansion = 1; | |
338 | #endif | |
339 | ||
340 | #if defined (RESTRICTED_SHELL) | |
341 | restricted = 0; | |
342 | #endif | |
343 | } | |
7117c2d2 JA |
344 | |
345 | void | |
346 | initialize_flags () | |
347 | { | |
348 | register int i; | |
349 | ||
350 | for (i = 0; shell_flags[i].name; i++) | |
351 | optflags[i+1] = shell_flags[i].name; | |
352 | optflags[++i] = 'o'; | |
353 | optflags[++i] = ';'; | |
354 | optflags[i+1] = '\0'; | |
355 | } |