tools/lib/subcmd/parse-options.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __SUBCMD_PARSE_OPTIONS_H
   3 #define __SUBCMD_PARSE_OPTIONS_H
   4
   5 #include <linux/kernel.h>
   6 #include <stdbool.h>
   7 #include <stdint.h>
   8
   9 enum parse_opt_type {
  10         /* special types */
  11         OPTION_END,
  12         OPTION_ARGUMENT,
  13         OPTION_GROUP,
  14         /* options with no arguments */
  15         OPTION_BIT,
  16         OPTION_BOOLEAN,
  17         OPTION_INCR,
  18         OPTION_SET_UINT,
  19         OPTION_SET_PTR,
  20         /* options with arguments (usually) */
  21         OPTION_STRING,
  22         OPTION_INTEGER,
  23         OPTION_LONG,
  24         OPTION_ULONG,
  25         OPTION_CALLBACK,
  26         OPTION_U64,
  27         OPTION_UINTEGER,
  28 };
  29
  30 enum parse_opt_flags {
  31         PARSE_OPT_KEEP_DASHDASH = 1,
  32         PARSE_OPT_STOP_AT_NON_OPTION = 2,
  33         PARSE_OPT_KEEP_ARGV0 = 4,
  34         PARSE_OPT_KEEP_UNKNOWN = 8,
  35         PARSE_OPT_NO_INTERNAL_HELP = 16,
  36 };
  37
  38 enum parse_opt_option_flags {
  39         PARSE_OPT_OPTARG  = 1,
  40         PARSE_OPT_NOARG   = 2,
  41         PARSE_OPT_NONEG   = 4,
  42         PARSE_OPT_HIDDEN  = 8,
  43         PARSE_OPT_LASTARG_DEFAULT = 16,
  44         PARSE_OPT_DISABLED = 32,
  45         PARSE_OPT_EXCLUSIVE = 64,
  46         PARSE_OPT_NOEMPTY  = 128,
  47         PARSE_OPT_NOBUILD  = 256,
  48         PARSE_OPT_CANSKIP  = 512,
  49 };
  50
  51 struct option;
  52 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  53
  54 /*
  55  * `type`::
  56  *   holds the type of the option, you must have an OPTION_END last in your
  57  *   array.
  58  *
  59  * `short_name`::
  60  *   the character to use as a short option name, '\0' if none.
  61  *
  62  * `long_name`::
  63  *   the long option name, without the leading dashes, NULL if none.
  64  *
  65  * `value`::
  66  *   stores pointers to the values to be filled.
  67  *
  68  * `argh`::
  69  *   token to explain the kind of argument this option wants. Keep it
  70  *   homogeneous across the repository.
  71  *
  72  * `help`::
  73  *   the short help associated to what the option does.
  74  *   Must never be NULL (except for OPTION_END).
  75  *   OPTION_GROUP uses this pointer to store the group header.
  76  *
  77  * `flags`::
  78  *   mask of parse_opt_option_flags.
  79  *   PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
  80  *   PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
  81  *   PARSE_OPT_NONEG: says that this option cannot be negated
  82  *   PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
  83  *                    the long one.
  84  *
  85  * `callback`::
  86  *   pointer to the callback to use for OPTION_CALLBACK.
  87  *
  88  * `defval`::
  89  *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
  90  *   OPTION_{BIT,SET_UINT,SET_PTR} store the {mask,integer,pointer} to put in
  91  *   the value when met.
  92  *   CALLBACKS can use it like they want.
  93  *
  94  * `set`::
  95  *   whether an option was set by the user
  96  */
  97 struct option {
  98         enum parse_opt_type type;
  99         int short_name;
 100         const char *long_name;
 101         void *value;
 102         const char *argh;
 103         const char *help;
 104         const char *build_opt;
 105
 106         int flags;
 107         parse_opt_cb *callback;
 108         intptr_t defval;
 109         bool *set;
 110         void *data;
 111         const struct option *parent;
 112 };
 113
 114 #define check_vtype(v, type) ( BUILD_BUG_ON_ZERO(!__builtin_types_compatible_p(typeof(v), type)) + v )
 115
 116 #define OPT_END()                   { .type = OPTION_END }
 117 #define OPT_PARENT(p)               { .type = OPTION_END, .parent = (p) }
 118 #define OPT_ARGUMENT(l, h)          { .type = OPTION_ARGUMENT, .long_name = (l), .help = (h) }
 119 #define OPT_GROUP(h)                { .type = OPTION_GROUP, .help = (h) }
 120 #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) }
 121 #define OPT_BOOLEAN(s, l, v, h)     { .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), .value = check_vtype(v, bool *), .help = (h) }
 122 #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) }
 123 #define OPT_BOOLEAN_SET(s, l, v, os, h) \
 124         { .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), \
 125         .value = check_vtype(v, bool *), .help = (h), \
 126         .set = check_vtype(os, bool *)}
 127 #define OPT_INCR(s, l, v, h)        { .type = OPTION_INCR, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h) }
 128 #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) }
 129 #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) }
 130 #define OPT_INTEGER(s, l, v, h)     { .type = OPTION_INTEGER, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h) }
 131 #define OPT_UINTEGER(s, l, v, h)    { .type = OPTION_UINTEGER, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned int *), .help = (h) }
 132 #define OPT_UINTEGER_OPTARG(s, l, v, d, h)    { .type = OPTION_UINTEGER, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned int *), .help = (h), .flags = PARSE_OPT_OPTARG, .defval = (intptr_t)(d) }
 133 #define OPT_LONG(s, l, v, h)        { .type = OPTION_LONG, .short_name = (s), .long_name = (l), .value = check_vtype(v, long *), .help = (h) }
 134 #define OPT_ULONG(s, l, v, h)        { .type = OPTION_ULONG, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned long *), .help = (h) }
 135 #define OPT_U64(s, l, v, h)         { .type = OPTION_U64, .short_name = (s), .long_name = (l), .value = check_vtype(v, u64 *), .help = (h) }
 136 #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) }
 137 #define OPT_STRING_OPTARG(s, l, v, a, h, d) \
 138         { .type = OPTION_STRING,  .short_name = (s), .long_name = (l), \
 139           .value = check_vtype(v, const char **), .argh =(a), .help = (h), \
 140           .flags = PARSE_OPT_OPTARG, .defval = (intptr_t)(d) }
 141 #define OPT_STRING_OPTARG_SET(s, l, v, os, a, h, d) \
 142         { .type = OPTION_STRING, .short_name = (s), .long_name = (l), \
 143           .value = check_vtype(v, const char **), .argh = (a), .help = (h), \
 144           .flags = PARSE_OPT_OPTARG, .defval = (intptr_t)(d), \
 145           .set = check_vtype(os, bool *)}
 146 #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}
 147 #define OPT_DATE(s, l, v, h) \
 148         { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = "time", .help = (h), .callback = parse_opt_approxidate_cb }
 149 #define OPT_CALLBACK(s, l, v, a, h, f) \
 150         { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f) }
 151 #define OPT_CALLBACK_SET(s, l, v, os, a, h, f) \
 152         { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f), .set = check_vtype(os, bool *)}
 153 #define OPT_CALLBACK_NOOPT(s, l, v, a, h, f) \
 154         { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f), .flags = PARSE_OPT_NOARG }
 155 #define OPT_CALLBACK_DEFAULT(s, l, v, a, h, f, d) \
 156         { .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 }
 157 #define OPT_CALLBACK_DEFAULT_NOOPT(s, l, v, a, h, f, d) \
 158         { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l),\
 159         .value = (v), .arg = (a), .help = (h), .callback = (f), .defval = (intptr_t)d,\
 160         .flags = PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NOARG}
 161 #define OPT_CALLBACK_OPTARG(s, l, v, d, a, h, f) \
 162         { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), \
 163           .value = (v), .argh = (a), .help = (h), .callback = (f), \
 164           .flags = PARSE_OPT_OPTARG, .data = (d) }
 165
 166 /* parse_options() will filter out the processed options and leave the
 167  * non-option argments in argv[].
 168  * Returns the number of arguments left in argv[].
 169  *
 170  * NOTE: parse_options() and parse_options_subcommand() may call exit() in the
 171  * case of an error (or for 'special' options like --list-cmds or --list-opts).
 172  */
 173 extern int parse_options(int argc, const char **argv,
 174                          const struct option *options,
 175                          const char * const usagestr[], int flags);
 176
 177 extern int parse_options_subcommand(int argc, const char **argv,
 178                                 const struct option *options,
 179                                 const char *const subcommands[],
 180                                 const char *usagestr[], int flags);
 181
 182 extern __noreturn void usage_with_options(const char * const *usagestr,
 183                                         const struct option *options);
 184 extern __noreturn __attribute__((format(printf,3,4)))
 185 void usage_with_options_msg(const char * const *usagestr,
 186                             const struct option *options,
 187                             const char *fmt, ...);
 188
 189 /*----- incremantal advanced APIs -----*/
 190
 191 enum {
 192         PARSE_OPT_HELP = -1,
 193         PARSE_OPT_DONE,
 194         PARSE_OPT_LIST_OPTS,
 195         PARSE_OPT_LIST_SUBCMDS,
 196         PARSE_OPT_UNKNOWN,
 197 };
 198
 199 /*
 200  * It's okay for the caller to consume argv/argc in the usual way.
 201  * Other fields of that structure are private to parse-options and should not
 202  * be modified in any way.
 203  */
 204 struct parse_opt_ctx_t {
 205         const char **argv;
 206         const char **out;
 207         int argc, cpidx;
 208         const char *opt;
 209         const struct option *excl_opt;
 210         int flags;
 211 };
 212
 213 extern int parse_options_usage(const char * const *usagestr,
 214                                const struct option *opts,
 215                                const char *optstr,
 216                                bool short_opt);
 217
 218
 219 /*----- some often used options -----*/
 220 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
 221 extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
 222 extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
 223
 224 #define OPT__VERBOSE(var)  OPT_BOOLEAN('v', "verbose", (var), "be verbose")
 225 #define OPT__QUIET(var)    OPT_BOOLEAN('q', "quiet",   (var), "be quiet")
 226 #define OPT__VERBOSITY(var) \
 227         { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \
 228           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
 229         { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \
 230           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
 231 #define OPT__DRY_RUN(var)  OPT_BOOLEAN('n', "dry-run", (var), "dry run")
 232 #define OPT__ABBREV(var)  \
 233         { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
 234           "use <n> digits to display SHA-1s", \
 235           PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
 236
 237 extern const char *parse_options_fix_filename(const char *prefix, const char *file);
 238
 239 void set_option_flag(struct option *opts, int sopt, const char *lopt, int flag);
 240 void set_option_nobuild(struct option *opts, int shortopt, const char *longopt,
 241                         const char *build_opt, bool can_skip);
 242
 243 #endif /* __SUBCMD_PARSE_OPTIONS_H */