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 separator that is set in the external string
70 bb_opt_complementally (see below for more info).
72 "+" If the first character in the applet_opts string is a plus,
73 then option processing will stop as soon as a non-option is
74 encountered in the argv array. Useful for applets like env
75 which should not process arguments to subprograms:
77 Here we want env to process just the '-i', not the '-d'.
79 static const struct option bb_default_long_options[]
81 This struct allows you to define long options. The syntax for
82 declaring the array is just like that of getopt's longopts.
85 static const struct option applet_long_options[] = {
86 { "verbose", 0, 0, v },
89 bb_applet_long_options = applet_long_options;
91 The last argument (val) can undefined from applet_opts.
92 If you use this, then:
93 - return bit have next position after short options
94 - if has_arg is not "no_argument", use ptr for arg also
95 - bb_opt_complementally have effects for this too
97 Note: a good applet will make long options configurable via the
98 config process and not a required feature. The current standard
99 is to name the config option CONFIG_FEATURE_<applet>_LONG_OPTIONS.
101 const char *bb_opt_complementally
102 this should be bb_opt_complementary, but we'll just keep it as
103 bb_opt_complementally due to the Russian origins
105 ":" The colon (":") is used to separate groups of two or more chars
106 and/or groups of chars and special characters (stating some
107 conditions to be checked).
109 "abc" If groups of two or more chars are specified, the first char
110 is the main option and the other chars are secondary options.
111 Their flags will be turned on if the main option is found even
112 if they are not specifed on the command line. For example:
114 bb_opt_complementally = "abc";
116 flags = bb_getopt_ulflags(argc, argv, "abcd")
118 If getopt() finds "-a" on the command line, then
119 bb_getopt_ulflags's return value will be as if "-a -b -c" were
122 "ww" Adjacent double options have a counter associated which indicates
123 the number of occurances of the option.
124 For example the ps applet needs:
125 if w is given once, GNU ps sets the width to 132,
126 if w is given more than once, it is "unlimited"
129 bb_opt_complementally = "ww";
130 bb_getopt_ulflags(argc, argv, "w", &w_counter);
133 width = (w_counter == 1) ? 132 : INT_MAX;
135 get_terminal_width(...&width...);
137 w_counter is a pointer to an integer. It has to be passed to
138 bb_getopt_ulflags() after all other option argument sinks.
139 For example: accept multiple -v to indicate the level of verbosity
140 and for each -b optarg, add optarg to my_b. Finally, if b is given,
141 turn off c and vice versa:
143 llist_t *my_b = NULL;
144 int verbose_level = 0;
145 bb_opt_complementally = "vv:b::b-c:c-b";
146 f = bb_getopt_ulflags(argc, argv, "vb:c", &my_b, &verbose_level);
147 if((f & 2)) // -c after -b unset this -b flag
148 while (my_b) { dosomething_with(my_b->data) ; my_b = my_b->link; }
149 if(my_b) // but llist stored always if -b found
151 if (verbose_level) bb_printf("verbose level is %d\n", verbose_level);
155 "-" A dash between two options causes the second of the two
156 to be unset (and ignored or triggered) if it is given on
160 The du applet has the options "-s" and "-d depth". If
161 bb_getopt_ulflags finds -s, then -d is unset or if it finds -d
162 then -s is unset. (Note: busybox implements the GNU
163 "--max-depth" option as "-d".) To obtain this behavior, you
164 set bb_opt_complementally = "s-d:d-s". Only one flag value is
165 added to bb_getopt_ulflags's return value depending on the
166 position of the options on the command line. If one of the
167 two options requires an argument pointer (":" in applet_opts
168 as in "d:") optarg is set accordingly.
170 char *smax_print_depth;
172 bb_opt_complementally = "s-d:d-s:x-x";
173 opt = bb_getopt_ulflags(argc, argv, "sd:x", &smax_print_depth);
176 max_print_depth = atoi(smax_print_depth);
179 printf("Detected odd -x usaging\n");
181 "-" A dash as the first char in a bb_opt_complementally group means to
182 convert the arguments as option. Next char for this case can't set
183 [0-9], recomended use ':' or end of line. For example:
185 bb_opt_complementally = "-:w-x:x-w";
186 bb_getopt_ulflags(argc, argv, "wx");
188 Allows any arguments to be given without a dash (./program w x)
189 as well as with a dash (./program -x). Why unset -w see above.
191 "-N" A dash as the first char in a bb_opt_complementally group with
192 number 0-9 as one char is means check minimal arguments required.
194 "V-" A option with dash before colon or end line indicate: call
195 bb_show_usage if this option give, for example verbose
198 "--" A double dash between two options, or between an option and a group
199 of options, means that they are mutually exclusive. Unlike
200 the "-" case above, an error will be forced if the options
204 The cut applet must have only one type of list specified, so
205 -b, -c and -f are mutally exclusive and should raise an error
206 if specified together. In this case you must set
207 bb_opt_complementally = "b--cf:c--bf:f--bc". If two of the
208 mutually exclusive options are found, bb_getopt_ulflags's
209 return value will have the error flag set (BB_GETOPT_ERROR) so
210 that we can check for it:
212 if (flags & BB_GETOPT_ERROR)
215 "?" A "ask" as the first char in a bb_opt_complementally group give:
216 if previous point set BB_GETOPT_ERROR, don't return and
217 call previous example internally. Next char for this case can't
218 set to [0-9], recomended use ':' or end of line.
220 "?N" A "ask" as the first char in a bb_opt_complementally group with
221 number 0-9 as one char is means check maximal arguments possible.
223 "::" A double colon after a char in bb_opt_complementally means that the
224 option can occur multiple times:
227 The grep applet can have one or more "-e pattern" arguments.
228 In this case you should use bb_getopt_ulflags() as follows:
230 llist_t *patterns = NULL;
232 (this pointer must be initializated to NULL if the list is empty
233 as required by *llist_add_to(llist_t *old_head, char *new_item).)
235 bb_opt_complementally = "e::";
237 bb_getopt_ulflags(argc, argv, "e:", &patterns);
238 $ grep -e user -e root /etc/passwd
239 root:x:0:0:root:/root:/bin/bash
240 user:x:500:500::/home/user:/bin/bash
242 "--" A double dash at the beginning of bb_opt_complementally means the
243 argv[1] string should always be treated as options, even if it isn't
244 prefixed with a "-". This is to support the special syntax in applets
245 such as "ar" and "tar":
248 "?" An "ask" between main and group options causes the second of the two
249 to be depending required as or if first is given on the command line.
250 For example from "id" applet:
252 // Don't allow -n -r -rn -ug -rug -nug -rnug
253 bb_opt_complementally = "r?ug:n?ug:?u--g:g--u";
254 flags = bb_getopt_ulflags(argc, argv, "rnug");
256 This example allowed only:
257 $ id; id -u; id -g; id -ru; id -nu; id -rg; id -ng; id -rnu; id -rng
259 "X" A one options in bb_opt_complementally group means
260 requires this option always with "or" logic if more one specified,
261 checked after switch off from complementally logic.
262 For example from "start-stop-daemon" applet:
264 // Don't allow -KS -SK, but -S or -K required
265 bb_opt_complementally = "K:S:?K--S:S--K";
266 flags = bb_getopt_ulflags(argc, argv, "KS...);
269 "x--x" give error if double or more used -x option
271 Don't forget ':' store. For example "?322-22-23X-x-a" interpretet as
272 "?3:22:-2:2-2:2-3Xa:2--x": max args is 3, count -2 usaged, min args is 2,
273 -2 option triggered, unset -3 and -X and -a if -2 any usaged, give error if
274 after -2 the -x option usaged.
278 /* this should be bb_opt_complementary, but we'll just keep it as
279 bb_opt_complementally due to the Russian origins */
280 const char *bb_opt_complementally;
285 unsigned long switch_on;
286 unsigned long switch_off;
287 unsigned long incongruously;
288 unsigned long requires;
289 void **optarg; /* char **optarg or llist_t **optarg */
293 /* You can set bb_applet_long_options for parse called long options */
295 static const struct option bb_default_long_options[] = {
296 /* { "help", 0, NULL, '?' }, */
300 const struct option *bb_applet_long_options = bb_default_long_options;
303 bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
305 unsigned long flags = 0;
306 unsigned long requires = 0;
307 t_complementally complementally[sizeof(flags) * 8 + 1];
309 const unsigned char *s;
310 t_complementally *on_off;
312 const struct option *l_o;
313 unsigned long trigger;
320 #define SHOW_USAGE_IF_ERROR 1
321 #define ALL_ARGV_IS_OPTS 2
322 #define FIRST_ARGV_IS_OPT 4
323 #define FREE_FIRST_ARGV_IS_OPT 8
326 va_start (p, applet_opts);
329 on_off = complementally;
330 memset(on_off, 0, sizeof(complementally));
332 /* skip GNU extension */
333 s = (const unsigned char *)applet_opts;
334 if(*s == '+' || *s == '-')
337 if(c >= (int)(sizeof(flags)*8))
340 on_off->switch_on = (1 << c);
342 on_off->optarg = va_arg (p, void **);
351 for(l_o = bb_applet_long_options; l_o->name; l_o++) {
354 for(on_off = complementally; on_off->opt != 0; on_off++)
355 if(on_off->opt == l_o->val)
357 if(on_off->opt == 0) {
358 if(c >= (int)(sizeof(flags)*8))
360 on_off->opt = l_o->val;
361 on_off->switch_on = (1 << c);
362 if(l_o->has_arg != no_argument)
363 on_off->optarg = va_arg (p, void **);
367 for (s = (const unsigned char *)bb_opt_complementally; s && *s; s++) {
368 t_complementally *pair;
369 unsigned long *pair_switch;
375 if(c < '0' || c > '9') {
376 spec_flgs |= SHOW_USAGE_IF_ERROR;
384 if(c < '0' || c > '9') {
386 spec_flgs |= FIRST_ARGV_IS_OPT;
389 spec_flgs |= ALL_ARGV_IS_OPTS;
396 for (on_off = complementally; on_off->opt; on_off++)
397 if (on_off->opt == *s)
399 if(c == ':' && s[2] == ':') {
403 if(c == ':' || c == '\0') {
404 requires |= on_off->switch_on;
407 if(c == '-' && (s[2] == ':' || s[2] == '\0')) {
408 flags |= on_off->switch_on;
409 on_off->incongruously |= on_off->switch_on;
414 on_off->counter = va_arg (p, int *);
418 pair_switch = &(pair->switch_on);
419 for(s++; *s && *s != ':'; s++) {
421 pair_switch = &(pair->requires);
422 } else if (*s == '-') {
423 if(pair_switch == &(pair->switch_off))
424 pair_switch = &(pair->incongruously);
426 pair_switch = &(pair->switch_off);
428 for (on_off = complementally; on_off->opt; on_off++)
429 if (on_off->opt == *s) {
430 *pair_switch |= on_off->switch_on;
439 #if defined(CONFIG_AR) || defined(CONFIG_TAR)
440 if((spec_flgs & FIRST_ARGV_IS_OPT)) {
441 if(argv[1] && argv[1][0] != '-' && argv[1][0] != '\0') {
442 argv[1] = bb_xasprintf("-%s", argv[1]);
443 if(ENABLE_FEATURE_CLEAN_UP)
444 spec_flgs |= FREE_FIRST_ARGV_IS_OPT;
448 while ((c = getopt_long (argc, argv, applet_opts,
449 bb_applet_long_options, NULL)) >= 0) {
453 for (on_off = complementally; on_off->opt != c; on_off++) {
454 /* c==0 if long opt have non NULL flag */
455 if(on_off->opt == 0 && c != 0)
458 if(flags & on_off->incongruously) {
459 if((spec_flgs & SHOW_USAGE_IF_ERROR))
461 flags |= BB_GETOPT_ERROR;
463 trigger = on_off->switch_on & on_off->switch_off;
464 flags &= ~(on_off->switch_off ^ trigger);
465 flags |= on_off->switch_on ^ trigger;
468 (*(on_off->counter))++;
469 if(on_off->list_flg) {
470 *(llist_t **)(on_off->optarg) =
471 llist_add_to(*(llist_t **)(on_off->optarg), optarg);
472 } else if (on_off->optarg) {
473 *(char **)(on_off->optarg) = optarg;
482 if((spec_flgs & ALL_ARGV_IS_OPTS)) {
483 /* process argv is option, for example "ps" applet */
485 pargv = argv + optind;
492 goto loop_arg_is_opt;
498 #if (defined(CONFIG_AR) || defined(CONFIG_TAR)) && \
499 defined(CONFIG_FEATURE_CLEAN_UP)
500 if((spec_flgs & FREE_FIRST_ARGV_IS_OPT))
503 /* check depending requires for given options */
504 for (on_off = complementally; on_off->opt; on_off++) {
505 if(on_off->requires && (flags & on_off->switch_on) &&
506 (flags & on_off->requires) == 0)
509 if(requires && (flags & requires) == 0)
512 if(argc < min_arg || (max_arg >= 0 && argc > max_arg))