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 "!" If previous point set BB_GETOPT_ERROR, don`t return and call
201 previous example internally
203 "*" A star after a char in bb_opt_complementally means that the
204 option can occur multiple times:
207 The grep applet can have one or more "-e pattern" arguments.
208 In this case you should use bb_getopt_ulflags() as follows:
210 llist_t *patterns = NULL;
212 (this pointer must be initializated to NULL if the list is empty
213 as required by *llist_add_to(llist_t *old_head, char *new_item).)
215 bb_opt_complementally = "e*";
217 bb_getopt_ulflags(argc, argv, "e:", &patterns);
218 $ grep -e user -e root /etc/passwd
219 root:x:0:0:root:/root:/bin/bash
220 user:x:500:500::/home/user:/bin/bash
223 const char *bb_opt_complementally;
228 unsigned long switch_on;
229 unsigned long switch_off;
230 unsigned long incongruously;
231 void **optarg; /* char **optarg or llist_t **optarg */
235 /* You can set bb_applet_long_options for parse called long options */
237 static const struct option bb_default_long_options[] = {
238 /* { "help", 0, NULL, '?' }, */
242 const struct option *bb_applet_long_options = bb_default_long_options;
245 bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
247 unsigned long flags = 0;
248 t_complementally complementally[sizeof(flags) * 8 + 1];
250 const unsigned char *s;
251 t_complementally *on_off;
253 const struct option *l_o;
254 char flg_show_usage_if_error = 0;
255 char flg_argv_is_opts = 0;
256 unsigned long trigger;
259 va_start (p, applet_opts);
261 /* skip GNU extension */
263 if(*s == '+' || *s == '-')
267 on_off = complementally;
269 if(c >= (int)(sizeof(flags)*8))
272 on_off->switch_on = (1 << c);
273 on_off->list_flg = 0;
274 on_off->switch_off = 0;
275 on_off->incongruously = 0;
276 on_off->optarg = NULL;
277 on_off->counter = NULL;
279 on_off->optarg = va_arg (p, void **);
289 for(l_o = bb_applet_long_options; l_o->name; l_o++) {
290 for(on_off = complementally; on_off->opt != 0; on_off++)
291 if(on_off->opt == l_o->val)
293 if(on_off->opt == 0) {
294 if(c >= (int)(sizeof(flags)*8))
296 on_off->opt = l_o->val;
297 on_off->switch_on = (1 << c);
298 on_off->list_flg = 0;
299 on_off->switch_off = 0;
300 on_off->incongruously = 0;
301 on_off->counter = NULL;
302 if(l_o->has_arg != no_argument)
303 on_off->optarg = va_arg (p, void **);
305 on_off->optarg = NULL;
312 for (s = bb_opt_complementally; s && *s; s++) {
313 t_complementally *pair;
322 flg_show_usage_if_error = '!';
326 flg_argv_is_opts = '-';
329 for (on_off = complementally; on_off->opt; on_off++)
330 if (on_off->opt == *s)
333 for(s++; *s && *s != ':'; s++) {
334 if (*s == '-' || *s == '~') {
336 } else if(*s == '*') {
339 unsigned long *pair_switch = &(pair->switch_on);
341 pair_switch = c == '-' ? &(pair->switch_off) : &(pair->incongruously);
342 for (on_off = complementally; on_off->opt; on_off++)
343 if (on_off->opt == *s) {
344 if(pair_switch == &(on_off->switch_on))
345 on_off->counter = va_arg (p, int *);
347 *pair_switch |= on_off->switch_on;
355 while ((c = getopt_long (argc, argv, applet_opts,
356 bb_applet_long_options, NULL)) > 0) {
359 for (on_off = complementally; on_off->opt != c; on_off++) {
363 if(flags & on_off->incongruously) {
364 if(flg_show_usage_if_error)
366 flags |= BB_GETOPT_ERROR;
368 trigger = on_off->switch_on & on_off->switch_off;
369 flags &= ~(on_off->switch_off ^ trigger);
370 flags |= on_off->switch_on ^ trigger;
373 (*(on_off->counter))++;
374 if(on_off->list_flg) {
375 *(llist_t **)(on_off->optarg) =
376 llist_add_to(*(llist_t **)(on_off->optarg), optarg);
377 } else if (on_off->optarg) {
378 *(char **)(on_off->optarg) = optarg;
380 if(flg_argv_is_opts == 'p')
383 if(flg_argv_is_opts) {
384 /* process argv is option, for example "ps" applet */
385 if(flg_argv_is_opts == '-') {
386 flg_argv_is_opts = 'p';
387 pargv = argv + optind;
395 goto loop_arg_is_opt;