#include "libbb.h"
#include <getopt.h>
-/* Documentation
+/* Documentation
unsigned long
bb_getopt_ulflags(int argc, char **argv, const char *applet_opts, ...)
- The command line options must be declared in const char
- *applet_opts as a string of chars, for example:
+ The command line options must be declared in const char
+ *applet_opts as a string of chars, for example:
- flags = bb_getopt_ulflags(argc, argv, "rnug");
+ flags = bb_getopt_ulflags(argc, argv, "rnug");
- If one of the given options is found, a flag value is added to
- the return value (an unsigned long).
+ If one of the given options is found, a flag value is added to
+ the return value (an unsigned long).
- The flag value is determined by the position of the char in
- applet_opts string. For example, in the above case:
+ The flag value is determined by the position of the char in
+ applet_opts string. For example, in the above case:
- flags = bb_getopt_ulflags(argc, argv, "rnug");
+ flags = bb_getopt_ulflags(argc, argv, "rnug");
- "r" will add 1 (bit 0)
- "n" will add 2 (bit 1)
- "u will add 4 (bit 2)
- "g" will add 8 (bit 3)
+ "r" will add 1 (bit 0)
+ "n" will add 2 (bit 1)
+ "u will add 4 (bit 2)
+ "g" will add 8 (bit 3)
- and so on. You can also look at the return value as a bit
- field and each option sets one bit.
+ and so on. You can also look at the return value as a bit
+ field and each option sets one bit.
- On exit, global variable optind is set so that if you
- will do argc -= optind; argv += optind; then
- argc will be equal to number of remaining non-option
- arguments, first one would be in argv[0], next in argv[1] and so on
- (options and their parameters will be moved into argv[]
- positions prior to argv[optind]).
+ On exit, global variable optind is set so that if you
+ will do argc -= optind; argv += optind; then
+ argc will be equal to number of remaining non-option
+ arguments, first one would be in argv[0], next in argv[1] and so on
+ (options and their parameters will be moved into argv[]
+ positions prior to argv[optind]).
":" If one of the options requires an argument, then add a ":"
- after the char in applet_opts and provide a pointer to store
- the argument. For example:
+ after the char in applet_opts and provide a pointer to store
+ the argument. For example:
- char *pointer_to_arg_for_a;
- char *pointer_to_arg_for_b;
- char *pointer_to_arg_for_c;
- char *pointer_to_arg_for_d;
+ char *pointer_to_arg_for_a;
+ char *pointer_to_arg_for_b;
+ char *pointer_to_arg_for_c;
+ char *pointer_to_arg_for_d;
- flags = bb_getopt_ulflags(argc, argv, "a:b:c:d:",
- &pointer_to_arg_for_a, &pointer_to_arg_for_b,
- &pointer_to_arg_for_c, &pointer_to_arg_for_d);
+ flags = bb_getopt_ulflags(argc, argv, "a:b:c:d:",
+ &pointer_to_arg_for_a, &pointer_to_arg_for_b,
+ &pointer_to_arg_for_c, &pointer_to_arg_for_d);
- The type of the pointer (char* or llist_t*) may be controlled
- by the "::" special separator that is set in the external string
- bb_opt_complementally (see below for more info).
+ The type of the pointer (char* or llist_t*) may be controlled
+ by the "::" special separator that is set in the external string
+ bb_opt_complementally (see below for more info).
+
+ "::" If option can have an *optional* argument, then add a "::"
+ after its char in applet_opts and provide a pointer to store
+ the argument. Note that optional arguments _must_
+ immediately follow the option: -oparam, not -o param.
"+" If the first character in the applet_opts string is a plus,
- then option processing will stop as soon as a non-option is
- encountered in the argv array. Useful for applets like env
- which should not process arguments to subprograms:
- env -i ls -d /
- Here we want env to process just the '-i', not the '-d'.
+ then option processing will stop as soon as a non-option is
+ encountered in the argv array. Useful for applets like env
+ which should not process arguments to subprograms:
+ env -i ls -d /
+ Here we want env to process just the '-i', not the '-d'.
const struct option *bb_applet_long_options
- This struct allows you to define long options. The syntax for
- declaring the array is just like that of getopt's longopts.
- (see getopt(3))
+ This struct allows you to define long options. The syntax for
+ declaring the array is just like that of getopt's longopts.
+ (see getopt(3))
- static const struct option applet_long_options[] = {
- //name,has_arg,flag,val
- { "verbose", 0, 0, 'v' },
- { 0, 0, 0, 0 }
- };
- bb_applet_long_options = applet_long_options;
+ static const struct option applet_long_options[] = {
+ //name,has_arg,flag,val
+ { "verbose", 0, 0, 'v' },
+ { 0, 0, 0, 0 }
+ };
+ bb_applet_long_options = applet_long_options;
- The last member of struct option (val) typically is set to
- matching short option from applet_opts. If there is no matching
- char in applet_opts, then:
- - return bit have next position after short options
- - if has_arg is not "no_argument", use ptr for arg also
- - bb_opt_complementally affects it too
+ The last member of struct option (val) typically is set to
+ matching short option from applet_opts. If there is no matching
+ char in applet_opts, then:
+ - return bit have next position after short options
+ - if has_arg is not "no_argument", use ptr for arg also
+ - bb_opt_complementally affects it too
- Note: a good applet will make long options configurable via the
- config process and not a required feature. The current standard
- is to name the config option CONFIG_FEATURE_<applet>_LONG_OPTIONS.
+ Note: a good applet will make long options configurable via the
+ config process and not a required feature. The current standard
+
is to name the config option CONFIG_FEATURE_<applet>_LONG_OPTIONS.
const char *bb_opt_complementally
- this should be bb_opt_complementary, but we'll just keep it as
- bb_opt_complementally due to the Russian origins
+ this should be bb_opt_complementary, but we'll just keep it as
+ bb_opt_complementally due to the Russian origins
":" The colon (":") is used to separate groups of two or more chars
- and/or groups of chars and special characters (stating some
- conditions to be checked).
+ and/or groups of chars and special characters (stating some
+ conditions to be checked).
"abc" If groups of two or more chars are specified, the first char
- is the main option and the other chars are secondary options.
- Their flags will be turned on if the main option is found even
- if they are not specifed on the command line. For example:
+ is the main option and the other chars are secondary options.
+ Their flags will be turned on if the main option is found even
+ if they are not specifed on the command line. For example:
- bb_opt_complementally = "abc";
- flags = bb_getopt_ulflags(argc, argv, "abcd")
+ bb_opt_complementally = "abc";
+ flags = bb_getopt_ulflags(argc, argv, "abcd")
- If getopt() finds "-a" on the command line, then
- bb_getopt_ulflags's return value will be as if "-a -b -c" were
- found.
+ If getopt() finds "-a" on the command line, then
+ bb_getopt_ulflags's return value will be as if "-a -b -c" were
+ found.
"ww" Adjacent double options have a counter associated which indicates
- the number of occurences of the option.
- For example the ps applet needs:
- if w is given once, GNU ps sets the width to 132,
- if w is given more than once, it is "unlimited"
-
- int w_counter = 0;
- bb_opt_complementally = "ww";
- bb_getopt_ulflags(argc, argv, "w", &w_counter);
- if (w_counter)
- width = (w_counter == 1) ? 132 : INT_MAX;
- else
- get_terminal_width(...&width...);
-
- w_counter is a pointer to an integer. It has to be passed to
- bb_getopt_ulflags() after all other option argument sinks.
-
- For example: accept multiple -v to indicate the level of verbosity
- and for each -b optarg, add optarg to my_b. Finally, if b is given,
- turn off c and vice versa:
-
- llist_t *my_b = NULL;
- int verbose_level = 0;
- bb_opt_complementally = "vv:b::b-c:c-b";
- f = bb_getopt_ulflags(argc, argv, "vb:c", &my_b, &verbose_level);
- if (f & 2) // -c after -b unsets -b flag
- while (my_b) { dosomething_with(my_b->data); my_b = my_b->link; }
- if (my_b) // but llist is stored if -b is specified
- free_llist(my_b);
- if (verbose_level) bb_printf("verbose level is %d\n", verbose_level);
+ the number of occurences of the option.
+ For example the ps applet needs:
+ if w is given once, GNU ps sets the width to 132,
+ if w is given more than once, it is "unlimited"
+
+ int w_counter = 0;
+ bb_opt_complementally = "ww";
+ bb_getopt_ulflags(argc, argv, "w", &w_counter);
+ if (w_counter)
+ width = (w_counter == 1) ? 132 : INT_MAX;
+ else
+ get_terminal_width(...&width...);
+
+ w_counter is a pointer to an integer. It has to be passed to
+ bb_getopt_ulflags() after all other option argument sinks.
+
+ For example: accept multiple -v to indicate the level of verbosity
+ and for each -b optarg, add optarg to my_b. Finally, if b is given,
+ turn off c and vice versa:
+
+ llist_t *my_b = NULL;
+ int verbose_level = 0;
+ bb_opt_complementally = "vv:b::b-c:c-b";
+ f = bb_getopt_ulflags(argc, argv, "vb:c", &my_b, &verbose_level);
+ if (f & 2) // -c after -b unsets -b flag
+ while (my_b) { dosomething_with(my_b->data); my_b = my_b->link; }
+ if (my_b) // but llist is stored if -b is specified
+ free_llist(my_b);
+ if (verbose_level) bb_printf("verbose level is %d\n", verbose_level);
Special characters:
"-" A dash between two options causes the second of the two
- to be unset (and ignored) if it is given on the command line.
+ to be unset (and ignored) if it is given on the command line.
- [FIXME: what if they are the same? like "x-x"? Is it ever useful?]
+ [FIXME: what if they are the same? like "x-x"? Is it ever useful?]
- For example:
- The du applet has the options "-s" and "-d depth". If
- bb_getopt_ulflags finds -s, then -d is unset or if it finds -d
- then -s is unset. (Note: busybox implements the GNU
- "--max-depth" option as "-d".) To obtain this behavior, you
- set bb_opt_complementally = "s-d:d-s". Only one flag value is
- added to bb_getopt_ulflags's return value depending on the
- position of the options on the command line. If one of the
- two options requires an argument pointer (":" in applet_opts
- as in "d:") optarg is set accordingly.
+ For example:
+ The du applet has the options "-s" and "-d depth". If
+ bb_getopt_ulflags finds -s, then -d is unset or if it finds -d
+ then -s is unset. (Note: busybox implements the GNU
+ "--max-depth" option as "-d".) To obtain this behavior, you
+ set bb_opt_complementally = "s-d:d-s". Only one flag value is
+ added to bb_getopt_ulflags's return value depending on the
+ position of the options on the command line. If one of the
+ two options requires an argument pointer (":" in applet_opts
+ as in "d:") optarg is set accordingly.
- char *smax_print_depth;
+ char *smax_print_depth;
- bb_opt_complementally = "s-d:d-s:x-x";
- opt = bb_getopt_ulflags(argc, argv, "sd:x", &smax_print_depth);
+ bb_opt_complementally = "s-d:d-s:x-x";
+ opt = bb_getopt_ulflags(argc, argv, "sd:x", &smax_print_depth);
- if (opt & 2)
- max_print_depth = atoi(smax_print_depth);
- if (opt & 4)
- printf("Detected odd -x usage\n");
+ if (opt & 2)
+ max_print_depth = atoi(smax_print_depth);
+ if (opt & 4)
+ printf("Detected odd -x usage\n");
"-" A dash as the first char in a bb_opt_complementally group forces
- all arguments to be treated as options, even if they have
- no leading dashes. Next char in this case can't be a digit (0-9),
- use ':' or end of line. For example:
+ all arguments to be treated as options, even if they have
+ no leading dashes. Next char in this case can't be a digit (0-9),
+ use ':' or end of line. For example:
- bb_opt_complementally = "-:w-x:x-w";
- bb_getopt_ulflags(argc, argv, "wx");
+ bb_opt_complementally = "-:w-x:x-w";
+ bb_getopt_ulflags(argc, argv, "wx");
- Allows any arguments to be given without a dash (./program w x)
- as well as with a dash (./program -x).
+ Allows any arguments to be given without a dash (./program w x)
+ as well as with a dash (./program -x).
"-N" A dash as the first char in a bb_opt_complementally group followed
- by a single digit (0-9) means that at least N non-option
- arguments must be present on the command line
+ by a single digit (0-9) means that at least N non-option
+ arguments must be present on the command line
"V-" An option with dash before colon or end-of-line results in
- bb_show_usage being called if this option is encountered.
- This is typically used to implement "print verbose usage message
- and exit" option.
+ bb_show_usage being called if this option is encountered.
+ This is typically used to implement "print verbose usage message
+ and exit" option.
"--" A double dash between two options, or between an option and a group
- of options, means that they are mutually exclusive. Unlike
- the "-" case above, an error will be forced if the options
- are used together.
-
- For example:
- The cut applet must have only one type of list specified, so
- -b, -c and -f are mutally exclusive and should raise an error
- if specified together. In this case you must set
- bb_opt_complementally = "b--cf:c--bf:f--bc". If two of the
- mutually exclusive options are found, bb_getopt_ulflags's
- return value will have the error flag set (BB_GETOPT_ERROR) so
- that we can check for it:
-
- if (flags & BB_GETOPT_ERROR)
- bb_show_usage();
+ of options, means that they are mutually exclusive. Unlike
+ the "-" case above, an error will be forced if the options
+ are used together.
+
+ For example:
+ The cut applet must have only one type of list specified, so
+ -b, -c and -f are mutally exclusive and should raise an error
+ if specified together. In this case you must set
+ bb_opt_complementally = "b--cf:c--bf:f--bc". If two of the
+ mutually exclusive options are found, bb_getopt_ulflags's
+ return value will have the error flag set (BB_GETOPT_ERROR) so
+ that we can check for it:
+
+ if (flags & BB_GETOPT_ERROR)
+ bb_show_usage();
"x--x" Variation of the above, it means that -x option should occur
- at most once.
+ at most once.
"?" A "?" as the first char in a bb_opt_complementally group means:
- if BB_GETOPT_ERROR is detected, don't return, call bb_show_usage
- and exit instead. Next char after '?' can't be a digit.
+ if BB_GETOPT_ERROR is detected, don't return, call bb_show_usage
+ and exit instead. Next char after '?' can't be a digit.
"?N" A "?" as the first char in a bb_opt_complementally group followed
- by a single digit (0-9) means that at most N arguments must be present
- on the command line.
+ by a single digit (0-9) means that at most N arguments must be present
+ on the command line.
"::" A double colon after a char in bb_opt_complementally means that the
- option can occur multiple times. Each occurrence will be saved as
- a llist_t element instead of char*.
+ option can occur multiple times. Each occurrence will be saved as
+ a llist_t element instead of char*.
- For example:
- The grep applet can have one or more "-e pattern" arguments.
- In this case you should use bb_getopt_ulflags() as follows:
+ For example:
+ The grep applet can have one or more "-e pattern" arguments.
+ In this case you should use bb_getopt_ulflags() as follows:
- llist_t *patterns = NULL;
+ llist_t *patterns = NULL;
- (this pointer must be initializated to NULL if the list is empty
- as required by *llist_add_to(llist_t *old_head, char *new_item).)
+ (this pointer must be initializated to NULL if the list is empty
+ as required by *llist_add_to(llist_t *old_head, char *new_item).)
- bb_opt_complementally = "e::";
+ bb_opt_complementally = "e::";
- bb_getopt_ulflags(argc, argv, "e:", &patterns);
- $ grep -e user -e root /etc/passwd
- root:x:0:0:root:/root:/bin/bash
- user:x:500:500::/home/user:/bin/bash
+ bb_getopt_ulflags(argc, argv, "e:", &patterns);
+ $ grep -e user -e root /etc/passwd
+ root:x:0:0:root:/root:/bin/bash
+ user:x:500:500::/home/user:/bin/bash
"--" A double dash at the beginning of bb_opt_complementally means the
- argv[1] string should always be treated as options, even if it isn't
- prefixed with a "-". This is useful for special syntax in applets
- such as "ar" and "tar":
- tar xvf foo.tar
+ argv[1] string should always be treated as options, even if it isn't
+ prefixed with a "-". This is useful for special syntax in applets
+ such as "ar" and "tar":
+ tar xvf foo.tar
"?" An "?" between an option and a group of options means that
- at least one of them is required to occur if the first option
- occurs in preceding command line arguments.
+ at least one of them is required to occur if the first option
+ occurs in preceding command line arguments.
- For example from "id" applet:
+ For example from "id" applet:
- // Don't allow -n -r -rn -ug -rug -nug -rnug
- bb_opt_complementally = "r?ug:n?ug:?u--g:g--u";
- flags = bb_getopt_ulflags(argc, argv, "rnug");
+ // Don't allow -n -r -rn -ug -rug -nug -rnug
+ bb_opt_complementally = "r?ug:n?ug:?u--g:g--u";
+ flags = bb_getopt_ulflags(argc, argv, "rnug");
- This example allowed only:
- $ id; id -u; id -g; id -ru; id -nu; id -rg; id -ng; id -rnu; id -rng
+ This example allowed only:
+ $ id; id -u; id -g; id -ru; id -nu; id -rg; id -ng; id -rnu; id -rng
"X" A bb_opt_complementally group with just a single letter means
- that this option is required. If more than one such group exists,
- at least one option is required to occur (not all of them).
- For example from "start-stop-daemon" applet:
+ that this option is required. If more than one such group exists,
+ at least one option is required to occur (not all of them).
+ For example from "start-stop-daemon" applet:
- // Don't allow -KS -SK, but -S or -K is required
- bb_opt_complementally = "K:S:?K--S:S--K";
- flags = bb_getopt_ulflags(argc, argv, "KS...);
+ // Don't allow -KS -SK, but -S or -K is required
+ bb_opt_complementally = "K:S:?K--S:S--K";
+ flags = bb_getopt_ulflags(argc, argv, "KS...);
- Don't forget to use ':'. For example "?322-22-23X-x-a" is interpreted as
- "?3:22:-2:2-2:2-3Xa:2--x": max 3 args; count uses of '-2'; min 2 args;
- if there is a '-2' option then unset '-3', '-X' and '-a'; if there is
- a '-2' and after it a '-x' then error out.
+ Don't forget to use ':'. For example, "?322-22-23X-x-a"
+ is interpreted as "?3:22:-2:2-2:2-3Xa:2--x" -
+ max 3 args; count uses of '-2'; min 2 args; if there is
+ a '-2' option then unset '-3', '-X' and '-a'; if there is
+ a '-2' and after it a '-x' then error out.
*/
/* this should be bb_opt_complementary, but we'll just keep it as
OSDN Git Service
