1 /* vi: set sw=4 ts=4: */
3 * universal getopt_ulflags implementation for busybox
5 * Copyright (C) 2003-2005 Vladimir Oleynik <dzo@simtreas.ru>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
34 The command line options must be declared in const char
35 *applet_opts as a string of chars, for example:
37 flags = bb_getopt_ulflags(argc, argv, "rnug");
39 If one of the given options is found, a flag value is added to
40 the return value (an unsigned long).
42 The flag value is determined by the position of the char in
43 applet_opts string. For example, in the above case:
45 flags = bb_getopt_ulflags(argc, argv, "rnug");
47 "r" will add 1 (bit 1 : 0x01)
48 "n" will add 2 (bit 2 : 0x02)
49 "u will add 4 (bit 3 : 0x03)
50 "g" will add 8 (bit 4 : 0x04)
52 and so on. You can also look at the return value as a bit
53 field and each option sets one of bits.
55 ":" If one of the options requires an argument, then add a ":"
56 after the char in applet_opts and provide a pointer to store
57 the argument. For example:
59 char *pointer_to_arg_for_a;
60 char *pointer_to_arg_for_b;
61 char *pointer_to_arg_for_c;
62 char *pointer_to_arg_for_d;
64 flags = bb_getopt_ulflags(argc, argv, "a:b:c:d:",
65 &pointer_to_arg_for_a, &pointer_to_arg_for_b,
66 &pointer_to_arg_for_c, &pointer_to_arg_for_d);
68 The type of the pointer (char* or llist_t *) may be controlled
69 by the "*" special character that is set in the external string
70 bb_opt_complementally (see below for more info).
72 static const struct option bb_default_long_options[]
74 This struct allows you to define long options. The syntax for
75 declaring the array is just like that of getopt's longopts.
78 static const struct option applet_long_options[] = {
79 { "verbose", 0, 0, v },
82 bb_applet_long_options = applet_long_options;
84 The last argument (val) can undefined from applet_opts.
85 If you use this, then:
86 - return bit have next position after short options
87 - if has_arg is not "no_argument", use ptr for arg also
88 - bb_opt_complementally have effects for this too
90 Note: a good applet will make long options configurable via the
91 config process and not a required feature. The current standard
92 is to name the config option CONFIG_FEATURE_<applet>_LONG_OPTIONS.
94 const char *bb_opt_complementally
96 ":" The colon (":") is used to separate groups of two or more chars
97 and/or groups of chars and special characters (stating some
98 conditions to be checked).
100 "abc" If groups of two or more chars are specified, the first char
101 is the main option and the other chars are secondary options.
102 Their flags will be turned on if the main option is found even
103 if they are not specifed on the command line. For example:
105 bb_opt_complementally = "abc";
107 flags = bb_getopt_ulflags(argc, argv, "abcd")
109 If getopt() finds "-a" on the command line, then
110 bb_getopt_ulflags's return value will be as if "-a -b -c" were
113 "ww" Adjacent double options have a counter associated which indicates
114 the number of occurances of the option.
115 For example the ps applet needs:
116 if w is given once, GNU ps sets the width to 132,
117 if w is given more than once, it is "unlimited"
120 bb_opt_complementally = "ww";
121 bb_getopt_ulflags(argc, argv, "w", &w_counter);
124 width = (w_counter == 1) ? 132 : INT_MAX;
126 get_terminal_width(...&width...);
128 w_counter is a pointer to an integer. It has to be passed to
129 bb_getopt_ulflags() after all other option argument sinks.
130 For example: accept multiple -v to indicate the level of verbosity and
131 for each -b optarg, add optarg to my_b. Finally, if b is given, turn off
134 llist_t *my_b = NULL;
135 int verbose_level = 0;
136 bb_opt_complementally = "vv:b*:b-c:c-b";
137 f = bb_getopt_ulflags(argc, argv, "vb:c", &my_b, &verbose_level);
138 if((f & 2)) // -c after -b unset this -b flag
139 while (my_b) { dosomething_with(my_b->data) ; my_b = my_b->link; }
140 if(my_b) // but llist stored always if -b found
142 if (verbose_level) bb_printf("verbose level is %d\n", verbose_level);
146 "-" A dash between two options causes the second of the two
147 to be unset (and ignored or triggered) if it is given on
151 The du applet has the options "-s" and "-d depth". If
152 bb_getopt_ulflags finds -s, then -d is unset or if it finds -d
153 then -s is unset. (Note: busybox implements the GNU
154 "--max-depth" option as "-d".) To obtain this behavior, you
155 set bb_opt_complementally = "s-d:d-s". Only one flag value is
156 added to bb_getopt_ulflags's return value depending on the
157 position of the options on the command line. If one of the
158 two options requires an argument pointer (":" in applet_opts
159 as in "d:") optarg is set accordingly.
161 char *smax_print_depth;
163 bb_opt_complementally = "s-d:d-s:x-x";
164 opt = bb_getopt_ulflags(argc, argv, "sd:x", &smax_print_depth);
167 max_print_depth = bb_xgetularg10_bnd(smax_print_depth,
171 printf("Detected odd -x usaging\n");
173 "-" A minus as the first char in a bb_opt_complementally group means to
174 convert the arguments as option.
177 bb_opt_complementally = "-:w-x:x-w";
178 bb_getopt_ulflags(argc, argv, "wx");
180 Allows any arguments to be given without a dash (./program w x)
181 as well as with a dash (./program -x). Why unset -w see above.
183 "~" A tilde between two options, or between an option and a group
184 of options, means that they are mutually exclusive. Unlike
185 the "-" case above, an error will be forced if the options
189 The cut applet must have only one type of list specified, so
190 -b, -c and -f are mutally exclusive and should raise an error
191 if specified together. In this case you must set
192 bb_opt_complementally = "b~cf:c~bf:f~bc". If two of the
193 mutually exclusive options are found, bb_getopt_ulflags's
194 return value will have the error flag set (BB_GETOPT_ERROR) so
195 that we can check for it:
197 if (flags & BB_GETOPT_ERROR)
200 "?" A "ask" as the first char in a bb_opt_complementally group give:
201 if previous point set BB_GETOPT_ERROR, don`t return and
202 call previous example internally
204 "*" A star after a char in bb_opt_complementally means that the
205 option can occur multiple times:
208 The grep applet can have one or more "-e pattern" arguments.
209 In this case you should use bb_getopt_ulflags() as follows:
211 llist_t *patterns = NULL;
213 (this pointer must be initializated to NULL if the list is empty
214 as required by *llist_add_to(llist_t *old_head, char *new_item).)
216 bb_opt_complementally = "e*";
218 bb_getopt_ulflags(argc, argv, "e:", &patterns);
219 $ grep -e user -e root /etc/passwd
220 root:x:0:0:root:/root:/bin/bash
221 user:x:500:500::/home/user:/bin/bash
223 "?" A "ask" between main and group options causes the second of the two
224 to be depending required if first is given on the command line.
225 For example from "id" applet:
227 // Don't allow -n -r -rn -ug -rug -nug -rnug
228 bb_opt_complementally = "?u~g:g~u:r?ug:n?ug";
229 flags = bb_getopt_ulflags(argc, argv, "rnug");
231 This example allowed only:
232 $ id; id -u; id -g; id -ru; id -nu; id -rg; id -ng; id -rnu; id -rng
234 "?" A "ask" between equivalent options in bb_opt_complementally means
235 requires this option always, checked after switch off from
237 For example from "start-stop-daemon" applet:
239 // Don't allow -KS -SK, but -S or -K required
240 bb_opt_complementally = "?:K?K:S?S:K~S:S~K";
241 flags = bb_getopt_ulflags(argc, argv, "KS...);
245 const char *bb_opt_complementally;
250 unsigned long switch_on;
251 unsigned long switch_off;
252 unsigned long incongruously;
253 unsigned long requires;
254 void **optarg; /* char **optarg or llist_t **optarg */
258 /* You can set bb_applet_long_options for parse called long options */
260 static const struct option bb_default_long_options[] = {
261 /* { "help", 0, NULL, '?' }, */
265 const struct option *bb_applet_long_options = bb_default_long_options;
268 bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
270 unsigned long flags = 0;
271 unsigned long requires = 0;
272 t_complementally complementally[sizeof(flags) * 8 + 1];
274 const unsigned char *s;
275 t_complementally *on_off;
277 const struct option *l_o;
278 unsigned long trigger;
281 #define SHOW_USAGE_IF_ERROR 1
282 #define ARGV_IS_OPTS 2
285 va_start (p, applet_opts);
287 /* skip GNU extension */
289 if(*s == '+' || *s == '-')
293 on_off = complementally;
294 memset(on_off, 0, sizeof(complementally));
297 if(c >= (int)(sizeof(flags)*8))
300 on_off->switch_on = (1 << c);
302 on_off->optarg = va_arg (p, void **);
311 for(l_o = bb_applet_long_options; l_o->name; l_o++) {
314 for(on_off = complementally; on_off->opt != 0; on_off++)
315 if(on_off->opt == l_o->val)
317 if(on_off->opt == 0) {
318 if(c >= (int)(sizeof(flags)*8))
320 on_off->opt = l_o->val;
321 on_off->switch_on = (1 << c);
322 if(l_o->has_arg != no_argument)
323 on_off->optarg = va_arg (p, void **);
328 for (s = bb_opt_complementally; s && *s; s++) {
329 t_complementally *pair;
338 spec_flgs |= SHOW_USAGE_IF_ERROR;
342 spec_flgs |= ARGV_IS_OPTS;
345 for (on_off = complementally; on_off->opt; on_off++)
346 if (on_off->opt == *s)
349 for(s++; *s && *s != ':'; s++) {
350 if (*s == '-' || *s == '~' || *s == '?') {
352 } else if(*s == '*') {
355 unsigned long *pair_switch;
359 pair_switch = &(pair->switch_off);
362 pair_switch = &(pair->incongruously);
365 pair_switch = &(pair->requires);
368 pair_switch = &(pair->switch_on);
370 for (on_off = complementally; on_off->opt; on_off++)
371 if (on_off->opt == *s) {
372 if(pair_switch == &(on_off->switch_on))
373 on_off->counter = va_arg (p, int *);
374 else if(pair_switch == &(on_off->requires))
375 requires |= on_off->switch_on;
377 *pair_switch |= on_off->switch_on;
385 while ((c = getopt_long (argc, argv, applet_opts,
386 bb_applet_long_options, NULL)) >= 0) {
389 for (on_off = complementally; on_off->opt != c; on_off++) {
390 /* c==0 if long opt have non NULL flag */
391 if(on_off->opt == 0 && c != 0)
394 if(flags & on_off->incongruously) {
395 if((spec_flgs & SHOW_USAGE_IF_ERROR))
397 flags |= BB_GETOPT_ERROR;
399 trigger = on_off->switch_on & on_off->switch_off;
400 flags &= ~(on_off->switch_off ^ trigger);
401 flags |= on_off->switch_on ^ trigger;
404 (*(on_off->counter))++;
405 if(on_off->list_flg) {
406 *(llist_t **)(on_off->optarg) =
407 llist_add_to(*(llist_t **)(on_off->optarg), optarg);
408 } else if (on_off->optarg) {
409 *(char **)(on_off->optarg) = optarg;
414 if((spec_flgs & ARGV_IS_OPTS)) {
415 /* process argv is option, for example "ps" applet */
417 pargv = argv + optind;
424 goto loop_arg_is_opt;
428 /* check depending requires for given options */
429 for (on_off = complementally; on_off->opt; on_off++) {
430 if(on_off->requires && (flags & on_off->switch_on) &&
431 (flags & on_off->requires) == 0)
434 if(requires && (flags & requires) == 0)