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346 lines
12 KiB
346 lines
12 KiB
14 years ago
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#ifndef CCAN_OPT_H
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#define CCAN_OPT_H
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#include <ccan/compiler/compiler.h>
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#include <ccan/typesafe_cb/typesafe_cb.h>
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#include <stdbool.h>
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#include <stdlib.h>
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struct opt_table;
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/**
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* OPT_WITHOUT_ARG() - macro for initializing an opt_table entry (without arg)
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* @names: the names of the option eg. "--foo", "-f" or "--foo|-f|--foobar".
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* @cb: the callback when the option is found.
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* @arg: the argument to hand to @cb.
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* @desc: the description for opt_usage(), or opt_hidden.
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*
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* This is a typesafe wrapper for initializing a struct opt_table. The callback
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* of type "char *cb(type *)", "char *cb(const type *)" or "char *cb(void *)",
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* where "type" is the type of the @arg argument.
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*
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* If the @cb returns non-NULL, opt_parse() will stop parsing, use the
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* returned string to form an error message for errlog(), free() the
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* string and return false.
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*
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* Any number of equivalent short or long options can be listed in @names,
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* separated by '|'. Short options are a single hyphen followed by a single
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* character, long options are two hyphens followed by one or more characters.
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*
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* See Also:
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* OPT_WITH_ARG()
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*/
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#define OPT_WITHOUT_ARG(names, cb, arg, desc) \
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{ (names), OPT_CB_NOARG((cb), (arg)), { (arg) }, (desc) }
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/**
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* OPT_WITH_ARG() - macro for initializing long and short option (with arg)
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* @names: the option names eg. "--foo=<arg>", "-f" or "-f|--foo <arg>".
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* @cb: the callback when the option is found (along with <arg>).
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* @show: the callback to print the value in get_usage (or NULL)
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* @arg: the argument to hand to @cb and @show
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* @desc: the description for opt_usage(), or opt_hidden.
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*
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* This is a typesafe wrapper for initializing a struct opt_table. The callback
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* is of type "char *cb(const char *, type *)",
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* "char *cb(const char *, const type *)" or "char *cb(const char *, void *)",
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* where "type" is the type of the @arg argument. The first argument to the
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* @cb is the argument found on the commandline.
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*
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* Similarly, if @show is not NULL, it should be of type "void *show(char *,
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* const type *)". It should write up to OPT_SHOW_LEN bytes into the first
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* argument; unless it uses the entire OPT_SHOW_LEN bytes it should
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* nul-terminate that buffer.
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*
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* Any number of equivalent short or long options can be listed in @names,
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* separated by '|'. Short options are a single hyphen followed by a single
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* character, long options are two hyphens followed by one or more characters.
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* A space or equals in @names is ignored for parsing, and only used
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* for printing the usage.
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*
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* If the @cb returns non-NULL, opt_parse() will stop parsing, use the
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* returned string to form an error message for errlog(), free() the
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* string and return false.
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*
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* See Also:
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* OPT_WITHOUT_ARG()
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*/
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#define OPT_WITH_ARG(name, cb, show, arg, desc) \
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{ (name), OPT_CB_ARG((cb), (show), (arg)), { (arg) }, (desc) }
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/**
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* OPT_SUBTABLE() - macro for including another table inside a table.
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* @table: the table to include in this table.
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* @desc: description of this subtable (for opt_usage()) or NULL.
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*/
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#define OPT_SUBTABLE(table, desc) \
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{ (const char *)(table), OPT_SUBTABLE, \
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sizeof(_check_is_entry(table)) ? NULL : NULL, NULL, NULL, \
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{ NULL }, (desc) }
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/**
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* OPT_ENDTABLE - macro to create final entry in table.
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*
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* This must be the final element in the opt_table array.
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*/
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#define OPT_ENDTABLE { NULL, OPT_END, NULL, NULL, NULL, { NULL }, NULL }
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/**
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* opt_register_table - register a table of options
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* @table: the table of options
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* @desc: description of this subtable (for opt_usage()) or NULL.
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*
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* The table must be terminated by OPT_ENDTABLE.
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*
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* Example:
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* static int verbose = 0;
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* static struct opt_table opts[] = {
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* OPT_WITHOUT_ARG("--verbose", opt_inc_intval, &verbose,
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* "Verbose mode (can be specified more than once)"),
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* OPT_WITHOUT_ARG("-v", opt_inc_intval, &verbose,
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* "Verbose mode (can be specified more than once)"),
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* OPT_WITHOUT_ARG("--usage", opt_usage_and_exit,
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* "args...\nA silly test program.",
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* "Print this message."),
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* OPT_ENDTABLE
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* };
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*
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* ...
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* opt_register_table(opts, NULL);
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*/
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void opt_register_table(const struct opt_table *table, const char *desc);
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/**
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* opt_register_noarg - register an option with no arguments
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* @names: the names of the option eg. "--foo", "-f" or "--foo|-f|--foobar".
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* @cb: the callback when the option is found.
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* @arg: the argument to hand to @cb.
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* @desc: the verbose description of the option (for opt_usage()), or NULL.
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*
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* This is used for registering a single commandline option which takes
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* no argument.
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*
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* The callback is of type "char *cb(type *)", "char *cb(const type *)"
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* or "char *cb(void *)", where "type" is the type of the @arg
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* argument.
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*
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* If the @cb returns non-NULL, opt_parse() will stop parsing, use the
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* returned string to form an error message for errlog(), free() the
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* string and return false.
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*/
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#define opt_register_noarg(names, cb, arg, desc) \
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_opt_register((names), OPT_CB_NOARG((cb), (arg)), (arg), (desc))
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/**
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* opt_register_arg - register an option with an arguments
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* @names: the names of the option eg. "--foo", "-f" or "--foo|-f|--foobar".
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* @cb: the callback when the option is found.
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* @show: the callback to print the value in get_usage (or NULL)
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* @arg: the argument to hand to @cb.
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* @desc: the verbose description of the option (for opt_usage()), or NULL.
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*
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* This is used for registering a single commandline option which takes
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* an argument.
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*
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* The callback is of type "char *cb(const char *, type *)",
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* "char *cb(const char *, const type *)" or "char *cb(const char *, void *)",
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* where "type" is the type of the @arg argument. The first argument to the
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* @cb is the argument found on the commandline.
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*
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* At least one of @longopt and @shortopt must be non-zero. If the
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* @cb returns false, opt_parse() will stop parsing and return false.
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*
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* Example:
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* static char *explode(const char *optarg, void *unused)
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* {
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* errx(1, "BOOM! %s", optarg);
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* }
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* ...
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* opt_register_arg("--explode|--boom", explode, NULL, NULL, opt_hidden);
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*/
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#define opt_register_arg(names, cb, show, arg, desc) \
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_opt_register((names), OPT_CB_ARG((cb), (show), (arg)), (arg), (desc))
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/**
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* opt_parse - parse arguments.
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* @argc: pointer to argc
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* @argv: argv array.
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* @errlog: the function to print errors
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*
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* This iterates through the command line and calls callbacks registered with
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* opt_register_table()/opt_register_arg()/opt_register_noarg(). If there
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* are unknown options, missing arguments or a callback returns false, then
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* an error message is printed and false is returned.
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*
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* On success, argc and argv are adjusted so only the non-option elements
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* remain, and true is returned.
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*
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* Example:
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* if (!opt_parse(&argc, argv, opt_log_stderr)) {
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* printf("You screwed up, aborting!\n");
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* exit(1);
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* }
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*
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* See Also:
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* opt_log_stderr, opt_log_stderr_exit
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*/
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bool opt_parse(int *argc, char *argv[], void (*errlog)(const char *fmt, ...));
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/**
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* opt_free_table - free the table.
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*
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* This frees the internal memory. Call this as the last
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* opt function.
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*/
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void opt_free_table(void);
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/**
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* opt_log_stderr - print message to stderr.
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* @fmt: printf-style format.
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*
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* This is a helper for opt_parse, to print errors to stderr.
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*
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* See Also:
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* opt_log_stderr_exit
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*/
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void opt_log_stderr(const char *fmt, ...);
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/**
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* opt_log_stderr_exit - print message to stderr, then exit(1)
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* @fmt: printf-style format.
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*
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* Just like opt_log_stderr, only then does exit(1). This means that
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* when handed to opt_parse, opt_parse will never return false.
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*
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* Example:
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* // This never returns false; just exits if there's an erorr.
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* opt_parse(&argc, argv, opt_log_stderr_exit);
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*/
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void opt_log_stderr_exit(const char *fmt, ...);
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/**
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* opt_invalid_argument - helper to allocate an "Invalid argument '%s'" string
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* @arg: the argument which was invalid.
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*
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* This is a helper for callbacks to return a simple error string.
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*/
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char *opt_invalid_argument(const char *arg);
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/**
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* opt_usage - create usage message
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* @argv0: the program name
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* @extra: extra details to print after the initial command, or NULL.
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*
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* Creates a usage message, with the program name, arguments, some extra details
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* and a table of all the options with their descriptions. If an option has
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* description opt_hidden, it is not shown here.
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*
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* If "extra" is NULL, then the extra information is taken from any
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* registered option which calls opt_usage_and_exit(). This avoids duplicating
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* that string in the common case.
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*
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* The result should be passed to free().
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*/
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char *opt_usage(const char *argv0, const char *extra);
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/**
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* opt_hidden - string for undocumented options.
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*
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* This can be used as the desc parameter if you want an option not to be
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* shown by opt_usage().
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*/
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extern const char opt_hidden[];
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/* Maximum length of arg to show in opt_usage */
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#define OPT_SHOW_LEN 80
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/* Standard helpers. You can write your own: */
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/* Sets the @b to true. */
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char *opt_set_bool(bool *b);
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/* Sets @b based on arg: (yes/no/true/false). */
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char *opt_set_bool_arg(const char *arg, bool *b);
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void opt_show_bool(char buf[OPT_SHOW_LEN], const bool *b);
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/* The inverse */
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char *opt_set_invbool(bool *b);
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void opt_show_invbool(char buf[OPT_SHOW_LEN], const bool *b);
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/* Sets @b based on !arg: (yes/no/true/false). */
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char *opt_set_invbool_arg(const char *arg, bool *b);
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/* Set a char *. */
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char *opt_set_charp(const char *arg, char **p);
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void opt_show_charp(char buf[OPT_SHOW_LEN], char *const *p);
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/* Set an integer value, various forms. Sets to 1 on arg == NULL. */
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char *opt_set_intval(const char *arg, int *i);
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void opt_show_intval(char buf[OPT_SHOW_LEN], const int *i);
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char *opt_set_uintval(const char *arg, unsigned int *ui);
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void opt_show_uintval(char buf[OPT_SHOW_LEN], const unsigned int *ui);
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char *opt_set_longval(const char *arg, long *l);
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void opt_show_longval(char buf[OPT_SHOW_LEN], const long *l);
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char *opt_set_ulongval(const char *arg, unsigned long *ul);
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void opt_show_ulongval(char buf[OPT_SHOW_LEN], const unsigned long *ul);
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/* Increment. */
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char *opt_inc_intval(int *i);
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/* Display version string to stdout, exit(0). */
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char *opt_version_and_exit(const char *version);
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/* Display usage string to stdout, exit(0). */
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char *opt_usage_and_exit(const char *extra);
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/* Below here are private declarations. */
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/* You can use this directly to build tables, but the macros will ensure
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* consistency and type safety. */
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enum opt_type {
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OPT_NOARG = 1, /* -f|--foo */
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OPT_HASARG = 2, /* -f arg|--foo=arg|--foo arg */
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OPT_SUBTABLE = 4, /* Actually, longopt points to a subtable... */
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OPT_END = 8, /* End of the table. */
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};
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struct opt_table {
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const char *names; /* pipe-separated names, --longopt or -s */
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enum opt_type type;
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char *(*cb)(void *arg); /* OPT_NOARG */
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char *(*cb_arg)(const char *optarg, void *arg); /* OPT_HASARG */
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void (*show)(char buf[OPT_SHOW_LEN], const void *arg);
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union {
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const void *carg;
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void *arg;
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size_t tlen;
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} u;
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const char *desc;
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};
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/* Resolves to the four parameters for non-arg callbacks. */
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#define OPT_CB_NOARG(cb, arg) \
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OPT_NOARG, \
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typesafe_cb_cast3(char *(*)(void *), \
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char *(*)(typeof(*(arg))*), \
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char *(*)(const typeof(*(arg))*), \
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char *(*)(const void *), (cb)), \
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NULL, NULL
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/* Resolves to the four parameters for arg callbacks. */
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#define OPT_CB_ARG(cb, show, arg) \
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OPT_HASARG, NULL, \
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typesafe_cb_cast3(char *(*)(const char *,void *), \
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char *(*)(const char *, typeof(*(arg))*), \
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char *(*)(const char *, const typeof(*(arg))*), \
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char *(*)(const char *, const void *), \
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(cb)), \
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typesafe_cb_cast(void (*)(char buf[], const void *), \
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void (*)(char buf[], const typeof(*(arg))*), (show))
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/* Non-typesafe register function. */
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void _opt_register(const char *names, enum opt_type type,
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char *(*cb)(void *arg),
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char *(*cb_arg)(const char *optarg, void *arg),
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void (*show)(char buf[OPT_SHOW_LEN], const void *arg),
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const void *arg, const char *desc);
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/* We use this to get typechecking for OPT_SUBTABLE */
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static inline int _check_is_entry(struct opt_table *e UNUSED) { return 0; }
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#endif /* CCAN_OPT_H */
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