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" Option have int counter usaging. For example ps applet:
114 if w is given once, GNU ps sets the width to 132,
115 if w is given more than once, it is "unlimited"
118 bb_opt_complementally = "ww";
119 flags = bb_getopt_ulflags(argc, argv, "w", &w_counter);
122 width = (w_counter == 1) ? 132 : INT_MAX;
124 get_terminal_width(...&width...);
126 w_counter - have counter -w usaging, must set int pointer
127 to bb_getopt_ulflags() after all other requires
131 "-" A dash between two options causes the second of the two
132 to be unset (and ignored or triggered) if it is given on
136 The du applet has the options "-s" and "-d depth". If
137 bb_getopt_ulflags finds -s, then -d is unset or if it finds -d
138 then -s is unset. (Note: busybox implements the GNU
139 "--max-depth" option as "-d".) To obtain this behavior, you
140 set bb_opt_complementally = "s-d:d-s". Only one flag value is
141 added to bb_getopt_ulflags's return value depending on the
142 position of the options on the command line. If one of the
143 two options requires an argument pointer (":" in applet_opts
144 as in "d:") optarg is set accordingly.
146 char *smax_print_depth;
148 bb_opt_complementally = "s-d:d-s:x-x";
149 opt = bb_getopt_ulflags(argc, argv, "sd:x", &smax_print_depth);
152 max_print_depth = bb_xgetularg10_bnd(smax_print_depth,
156 printf("Detected odd -x usaging\n");
158 "~" A tilde between two options, or between an option and a group
159 of options, means that they are mutually exclusive. Unlike
160 the "-" case above, an error will be forced if the options
164 The cut applet must have only one type of list specified, so
165 -b, -c and -f are mutally exclusive and should raise an error
166 if specified together. In this case you must set
167 bb_opt_complementally = "b~cf:c~bf:f~bc". If two of the
168 mutually exclusive options are found, bb_getopt_ulflags's
169 return value will have the error flag set (BB_GETOPT_ERROR) so
170 that we can check for it:
172 if (flags & BB_GETOPT_ERROR)
175 "!" If previous point set BB_GETOPT_ERROR, don`t return and call
176 previous example internally
178 "*" A star after a char in bb_opt_complementally means that the
179 option can occur multiple times:
182 The grep applet can have one or more "-e pattern" arguments.
183 In this case you should use bb_getopt_ulflags() as follows:
185 llist_t *patterns = NULL;
187 (this pointer must be initializated to NULL if the list is empty
188 as required by *llist_add_to(llist_t *old_head, char *new_item).)
190 bb_opt_complementally = "e*";
192 bb_getopt_ulflags(argc, argv, "e:", &patterns);
193 $ grep -e user -e root /etc/passwd
194 root:x:0:0:root:/root:/bin/bash
195 user:x:500:500::/home/user:/bin/bash
198 const char *bb_opt_complementally;
203 unsigned long switch_on;
204 unsigned long switch_off;
205 unsigned long incongruously;
206 void **optarg; /* char **optarg or llist_t **optarg */
210 /* You can set bb_applet_long_options for parse called long options */
212 static const struct option bb_default_long_options[] = {
213 /* { "help", 0, NULL, '?' }, */
217 const struct option *bb_applet_long_options = bb_default_long_options;
220 bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
222 unsigned long flags = 0;
223 t_complementally complementally[sizeof(flags) * 8 + 1];
225 const unsigned char *s;
226 t_complementally *on_off;
228 const struct option *l_o;
229 char flg_show_usage_if_error = 0;
231 va_start (p, applet_opts);
233 /* skip GNU extension */
235 if(*s == '+' || *s == '-')
239 on_off = complementally;
241 if(c >= (int)(sizeof(flags)*8))
244 on_off->switch_on = (1 << c);
245 on_off->list_flg = 0;
246 on_off->switch_off = 0;
247 on_off->incongruously = 0;
248 on_off->optarg = NULL;
249 on_off->counter = NULL;
251 on_off->optarg = va_arg (p, void **);
261 for(l_o = bb_applet_long_options; l_o->name; l_o++) {
262 for(on_off = complementally; on_off->opt != 0; on_off++)
263 if(on_off->opt == l_o->val)
265 if(on_off->opt == 0) {
266 if(c >= (int)(sizeof(flags)*8))
268 on_off->opt = l_o->val;
269 on_off->switch_on = (1 << c);
270 on_off->list_flg = 0;
271 on_off->switch_off = 0;
272 on_off->incongruously = 0;
273 on_off->counter = NULL;
274 if(l_o->has_arg != no_argument)
275 on_off->optarg = va_arg (p, void **);
277 on_off->optarg = NULL;
284 for (s = bb_opt_complementally; s && *s; s++) {
285 t_complementally *pair;
294 flg_show_usage_if_error = '!';
297 for (on_off = complementally; on_off->opt; on_off++)
298 if (on_off->opt == *s)
301 for(s++; *s && *s != ':'; s++) {
302 if (*s == '-' || *s == '~') {
304 } else if(*s == '*') {
307 unsigned long *pair_switch = &(pair->switch_on);
309 pair_switch = c == '-' ? &(pair->switch_off) : &(pair->incongruously);
310 for (on_off = complementally; on_off->opt; on_off++)
311 if (on_off->opt == *s) {
312 if(pair_switch == &(on_off->switch_on))
313 on_off->counter = va_arg (p, int *);
315 *pair_switch |= on_off->switch_on;
323 while ((c = getopt_long (argc, argv, applet_opts,
324 bb_applet_long_options, NULL)) > 0) {
325 unsigned long trigger;
327 for (on_off = complementally; on_off->opt != c; on_off++) {
331 if(flags & on_off->incongruously) {
332 if(flg_show_usage_if_error)
334 flags |= BB_GETOPT_ERROR;
336 trigger = on_off->switch_on & on_off->switch_off;
337 flags &= ~(on_off->switch_off ^ trigger);
338 flags |= on_off->switch_on ^ trigger;
341 (*(on_off->counter))++;
342 if(on_off->list_flg) {
343 *(llist_t **)(on_off->optarg) =
344 llist_add_to(*(llist_t **)(on_off->optarg), optarg);
345 } else if (on_off->optarg) {
346 *(char **)(on_off->optarg) = optarg;