245 lines
9.9 KiB
C
245 lines
9.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __SUBCMD_PARSE_OPTIONS_H
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#define __SUBCMD_PARSE_OPTIONS_H
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#include <linux/kernel.h>
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#include <stdbool.h>
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#include <stdint.h>
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#ifndef NORETURN
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#define NORETURN __attribute__((__noreturn__))
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#endif
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enum parse_opt_type {
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/* special types */
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OPTION_END,
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OPTION_ARGUMENT,
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OPTION_GROUP,
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/* options with no arguments */
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OPTION_BIT,
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OPTION_BOOLEAN,
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OPTION_INCR,
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OPTION_SET_UINT,
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OPTION_SET_PTR,
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/* options with arguments (usually) */
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OPTION_STRING,
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OPTION_INTEGER,
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OPTION_LONG,
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OPTION_ULONG,
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OPTION_CALLBACK,
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OPTION_U64,
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OPTION_UINTEGER,
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};
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enum parse_opt_flags {
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PARSE_OPT_KEEP_DASHDASH = 1,
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PARSE_OPT_STOP_AT_NON_OPTION = 2,
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PARSE_OPT_KEEP_ARGV0 = 4,
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PARSE_OPT_KEEP_UNKNOWN = 8,
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PARSE_OPT_NO_INTERNAL_HELP = 16,
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};
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enum parse_opt_option_flags {
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PARSE_OPT_OPTARG = 1,
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PARSE_OPT_NOARG = 2,
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PARSE_OPT_NONEG = 4,
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PARSE_OPT_HIDDEN = 8,
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PARSE_OPT_LASTARG_DEFAULT = 16,
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PARSE_OPT_DISABLED = 32,
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PARSE_OPT_EXCLUSIVE = 64,
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PARSE_OPT_NOEMPTY = 128,
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PARSE_OPT_NOBUILD = 256,
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PARSE_OPT_CANSKIP = 512,
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};
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struct option;
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typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
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/*
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* `type`::
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* holds the type of the option, you must have an OPTION_END last in your
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* array.
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*
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* `short_name`::
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* the character to use as a short option name, '\0' if none.
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*
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* `long_name`::
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* the long option name, without the leading dashes, NULL if none.
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*
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* `value`::
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* stores pointers to the values to be filled.
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*
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* `argh`::
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* token to explain the kind of argument this option wants. Keep it
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* homogenous across the repository.
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*
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* `help`::
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* the short help associated to what the option does.
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* Must never be NULL (except for OPTION_END).
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* OPTION_GROUP uses this pointer to store the group header.
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*
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* `flags`::
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* mask of parse_opt_option_flags.
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* PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
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* PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
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* PARSE_OPT_NONEG: says that this option cannot be negated
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* PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
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* the long one.
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*
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* `callback`::
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* pointer to the callback to use for OPTION_CALLBACK.
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*
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* `defval`::
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* default value to fill (*->value) with for PARSE_OPT_OPTARG.
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* OPTION_{BIT,SET_UINT,SET_PTR} store the {mask,integer,pointer} to put in
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* the value when met.
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* CALLBACKS can use it like they want.
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*
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* `set`::
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* whether an option was set by the user
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*/
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struct option {
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enum parse_opt_type type;
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int short_name;
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const char *long_name;
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void *value;
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const char *argh;
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const char *help;
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const char *build_opt;
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int flags;
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parse_opt_cb *callback;
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intptr_t defval;
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bool *set;
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void *data;
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const struct option *parent;
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};
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#define check_vtype(v, type) ( BUILD_BUG_ON_ZERO(!__builtin_types_compatible_p(typeof(v), type)) + v )
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#define OPT_END() { .type = OPTION_END }
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#define OPT_PARENT(p) { .type = OPTION_END, .parent = (p) }
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#define OPT_ARGUMENT(l, h) { .type = OPTION_ARGUMENT, .long_name = (l), .help = (h) }
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#define OPT_GROUP(h) { .type = OPTION_GROUP, .help = (h) }
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#define OPT_BIT(s, l, v, h, b) { .type = OPTION_BIT, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h), .defval = (b) }
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#define OPT_BOOLEAN(s, l, v, h) { .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), .value = check_vtype(v, bool *), .help = (h) }
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#define OPT_BOOLEAN_FLAG(s, l, v, h, f) { .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), .value = check_vtype(v, bool *), .help = (h), .flags = (f) }
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#define OPT_BOOLEAN_SET(s, l, v, os, h) \
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{ .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), \
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.value = check_vtype(v, bool *), .help = (h), \
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.set = check_vtype(os, bool *)}
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#define OPT_INCR(s, l, v, h) { .type = OPTION_INCR, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h) }
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#define OPT_SET_UINT(s, l, v, h, i) { .type = OPTION_SET_UINT, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned int *), .help = (h), .defval = (i) }
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#define OPT_SET_PTR(s, l, v, h, p) { .type = OPTION_SET_PTR, .short_name = (s), .long_name = (l), .value = (v), .help = (h), .defval = (p) }
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#define OPT_INTEGER(s, l, v, h) { .type = OPTION_INTEGER, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h) }
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#define OPT_UINTEGER(s, l, v, h) { .type = OPTION_UINTEGER, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned int *), .help = (h) }
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#define OPT_LONG(s, l, v, h) { .type = OPTION_LONG, .short_name = (s), .long_name = (l), .value = check_vtype(v, long *), .help = (h) }
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#define OPT_ULONG(s, l, v, h) { .type = OPTION_ULONG, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned long *), .help = (h) }
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#define OPT_U64(s, l, v, h) { .type = OPTION_U64, .short_name = (s), .long_name = (l), .value = check_vtype(v, u64 *), .help = (h) }
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#define OPT_STRING(s, l, v, a, h) { .type = OPTION_STRING, .short_name = (s), .long_name = (l), .value = check_vtype(v, const char **), .argh = (a), .help = (h) }
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#define OPT_STRING_OPTARG(s, l, v, a, h, d) \
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{ .type = OPTION_STRING, .short_name = (s), .long_name = (l), \
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.value = check_vtype(v, const char **), .argh =(a), .help = (h), \
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.flags = PARSE_OPT_OPTARG, .defval = (intptr_t)(d) }
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#define OPT_STRING_OPTARG_SET(s, l, v, os, a, h, d) \
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{ .type = OPTION_STRING, .short_name = (s), .long_name = (l), \
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.value = check_vtype(v, const char **), .argh = (a), .help = (h), \
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.flags = PARSE_OPT_OPTARG, .defval = (intptr_t)(d), \
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.set = check_vtype(os, bool *)}
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#define OPT_STRING_NOEMPTY(s, l, v, a, h) { .type = OPTION_STRING, .short_name = (s), .long_name = (l), .value = check_vtype(v, const char **), .argh = (a), .help = (h), .flags = PARSE_OPT_NOEMPTY}
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#define OPT_DATE(s, l, v, h) \
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{ .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = "time", .help = (h), .callback = parse_opt_approxidate_cb }
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#define OPT_CALLBACK(s, l, v, a, h, f) \
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{ .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f) }
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#define OPT_CALLBACK_NOOPT(s, l, v, a, h, f) \
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{ .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f), .flags = PARSE_OPT_NOARG }
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#define OPT_CALLBACK_DEFAULT(s, l, v, a, h, f, d) \
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{ .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f), .defval = (intptr_t)d, .flags = PARSE_OPT_LASTARG_DEFAULT }
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#define OPT_CALLBACK_DEFAULT_NOOPT(s, l, v, a, h, f, d) \
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{ .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l),\
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.value = (v), .arg = (a), .help = (h), .callback = (f), .defval = (intptr_t)d,\
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.flags = PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NOARG}
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#define OPT_CALLBACK_OPTARG(s, l, v, d, a, h, f) \
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{ .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), \
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.value = (v), .argh = (a), .help = (h), .callback = (f), \
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.flags = PARSE_OPT_OPTARG, .data = (d) }
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/* parse_options() will filter out the processed options and leave the
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* non-option argments in argv[].
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* Returns the number of arguments left in argv[].
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*
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* NOTE: parse_options() and parse_options_subcommand() may call exit() in the
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* case of an error (or for 'special' options like --list-cmds or --list-opts).
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*/
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extern int parse_options(int argc, const char **argv,
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const struct option *options,
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const char * const usagestr[], int flags);
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extern int parse_options_subcommand(int argc, const char **argv,
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const struct option *options,
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const char *const subcommands[],
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const char *usagestr[], int flags);
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extern NORETURN void usage_with_options(const char * const *usagestr,
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const struct option *options);
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extern NORETURN __attribute__((format(printf,3,4)))
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void usage_with_options_msg(const char * const *usagestr,
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const struct option *options,
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const char *fmt, ...);
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/*----- incremantal advanced APIs -----*/
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enum {
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PARSE_OPT_HELP = -1,
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PARSE_OPT_DONE,
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PARSE_OPT_LIST_OPTS,
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PARSE_OPT_LIST_SUBCMDS,
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PARSE_OPT_UNKNOWN,
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};
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/*
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* It's okay for the caller to consume argv/argc in the usual way.
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* Other fields of that structure are private to parse-options and should not
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* be modified in any way.
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*/
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struct parse_opt_ctx_t {
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const char **argv;
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const char **out;
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int argc, cpidx;
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const char *opt;
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const struct option *excl_opt;
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int flags;
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};
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extern int parse_options_usage(const char * const *usagestr,
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const struct option *opts,
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const char *optstr,
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bool short_opt);
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/*----- some often used options -----*/
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extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
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extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
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extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
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#define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose")
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#define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet")
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#define OPT__VERBOSITY(var) \
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{ OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \
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PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
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{ OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \
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PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
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#define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run")
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#define OPT__ABBREV(var) \
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{ OPTION_CALLBACK, 0, "abbrev", (var), "n", \
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"use <n> digits to display SHA-1s", \
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PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
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extern const char *parse_options_fix_filename(const char *prefix, const char *file);
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void set_option_flag(struct option *opts, int sopt, const char *lopt, int flag);
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void set_option_nobuild(struct option *opts, int shortopt, const char *longopt,
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const char *build_opt, bool can_skip);
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#endif /* __SUBCMD_PARSE_OPTIONS_H */
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