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 PARSE_OPT_OPTARG_ALLOW_NEXT = 32, 37 }; 38 39 enum parse_opt_option_flags { 40 PARSE_OPT_OPTARG = 1, 41 PARSE_OPT_NOARG = 2, 42 PARSE_OPT_NONEG = 4, 43 PARSE_OPT_HIDDEN = 8, 44 PARSE_OPT_LASTARG_DEFAULT = 16, 45 PARSE_OPT_DISABLED = 32, 46 PARSE_OPT_EXCLUSIVE = 64, 47 PARSE_OPT_NOEMPTY = 128, 48 PARSE_OPT_NOBUILD = 256, 49 PARSE_OPT_CANSKIP = 512, 50 PARSE_OPT_NOAUTONEG = 1024, 51 }; 52 53 struct option; 54 typedef int parse_opt_cb(const struct option *, const char *arg, int unset); 55 56 /* 57 * `type`:: 58 * holds the type of the option, you must have an OPTION_END last in your 59 * array. 60 * 61 * `short_name`:: 62 * the character to use as a short option name, '\0' if none. 63 * 64 * `long_name`:: 65 * the long option name, without the leading dashes, NULL if none. 66 * 67 * `value`:: 68 * stores pointers to the values to be filled. 69 * 70 * `argh`:: 71 * token to explain the kind of argument this option wants. Keep it 72 * homogeneous across the repository. 73 * 74 * `help`:: 75 * the short help associated to what the option does. 76 * Must never be NULL (except for OPTION_END). 77 * OPTION_GROUP uses this pointer to store the group header. 78 * 79 * `flags`:: 80 * mask of parse_opt_option_flags. 81 * PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs) 82 * PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs 83 * PARSE_OPT_NONEG: says that this option cannot be negated 84 * PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in 85 * the long one. 86 * 87 * `callback`:: 88 * pointer to the callback to use for OPTION_CALLBACK. 89 * 90 * `defval`:: 91 * default value to fill (*->value) with for PARSE_OPT_OPTARG. 92 * OPTION_{BIT,SET_UINT,SET_PTR} store the {mask,integer,pointer} to put in 93 * the value when met. 94 * CALLBACKS can use it like they want. 95 * 96 * `set`:: 97 * whether an option was set by the user 98 */ 99 struct option { 100 enum parse_opt_type type; 101 int short_name; 102 const char *long_name; 103 void *value; 104 const char *argh; 105 const char *help; 106 const char *build_opt; 107 108 int flags; 109 parse_opt_cb *callback; 110 intptr_t defval; 111 bool *set; 112 void *data; 113 const struct option *parent; 114 }; 115 116 #define check_vtype(v, type) ( BUILD_BUG_ON_ZERO(!__builtin_types_compatible_p(typeof(v), type)) + v ) 117 118 #define OPT_END() { .type = OPTION_END } 119 #define OPT_PARENT(p) { .type = OPTION_END, .parent = (p) } 120 #define OPT_ARGUMENT(l, h) { .type = OPTION_ARGUMENT, .long_name = (l), .help = (h) } 121 #define OPT_GROUP(h) { .type = OPTION_GROUP, .help = (h) } 122 #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) } 123 #define OPT_BOOLEAN(s, l, v, h) { .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), .value = check_vtype(v, bool *), .help = (h) } 124 #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) } 125 #define OPT_BOOLEAN_SET(s, l, v, os, h) \ 126 { .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), \ 127 .value = check_vtype(v, bool *), .help = (h), \ 128 .set = check_vtype(os, bool *)} 129 #define OPT_INCR(s, l, v, h) { .type = OPTION_INCR, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h) } 130 #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) } 131 #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) } 132 #define OPT_INTEGER(s, l, v, h) { .type = OPTION_INTEGER, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h) } 133 #define OPT_UINTEGER(s, l, v, h) { .type = OPTION_UINTEGER, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned int *), .help = (h) } 134 #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) } 135 #define OPT_LONG(s, l, v, h) { .type = OPTION_LONG, .short_name = (s), .long_name = (l), .value = check_vtype(v, long *), .help = (h) } 136 #define OPT_ULONG(s, l, v, h) { .type = OPTION_ULONG, .short_name = (s), .long_name = (l), .value = check_vtype(v, unsigned long *), .help = (h) } 137 #define OPT_U64(s, l, v, h) { .type = OPTION_U64, .short_name = (s), .long_name = (l), .value = check_vtype(v, u64 *), .help = (h) } 138 #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) } 139 #define OPT_STRING_OPTARG(s, l, v, a, h, d) \ 140 { .type = OPTION_STRING, .short_name = (s), .long_name = (l), \ 141 .value = check_vtype(v, const char **), .argh =(a), .help = (h), \ 142 .flags = PARSE_OPT_OPTARG, .defval = (intptr_t)(d) } 143 #define OPT_STRING_OPTARG_SET(s, l, v, os, a, h, d) \ 144 { .type = OPTION_STRING, .short_name = (s), .long_name = (l), \ 145 .value = check_vtype(v, const char **), .argh = (a), .help = (h), \ 146 .flags = PARSE_OPT_OPTARG, .defval = (intptr_t)(d), \ 147 .set = check_vtype(os, bool *)} 148 #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} 149 #define OPT_DATE(s, l, v, h) \ 150 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = "time", .help = (h), .callback = parse_opt_approxidate_cb } 151 #define OPT_CALLBACK(s, l, v, a, h, f) \ 152 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f) } 153 #define OPT_CALLBACK_FLAG(s, l, v, a, h, f, fl) \ 154 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f), .flags = (fl) } 155 #define OPT_CALLBACK_SET(s, l, v, os, a, h, f) \ 156 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f), .set = check_vtype(os, bool *)} 157 #define OPT_CALLBACK_NOOPT(s, l, v, a, h, f) \ 158 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = (a), .help = (h), .callback = (f), .flags = PARSE_OPT_NOARG } 159 #define OPT_CALLBACK_DEFAULT(s, l, v, a, h, f, d) \ 160 { .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 } 161 #define OPT_CALLBACK_DEFAULT_NOOPT(s, l, v, a, h, f, d) \ 162 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l),\ 163 .value = (v), .arg = (a), .help = (h), .callback = (f), .defval = (intptr_t)d,\ 164 .flags = PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NOARG} 165 #define OPT_CALLBACK_OPTARG(s, l, v, d, a, h, f) \ 166 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), \ 167 .value = (v), .argh = (a), .help = (h), .callback = (f), \ 168 .flags = PARSE_OPT_OPTARG, .data = (d) } 169 170 /* parse_options() will filter out the processed options and leave the 171 * non-option argments in argv[]. 172 * Returns the number of arguments left in argv[]. 173 * 174 * NOTE: parse_options() and parse_options_subcommand() may call exit() in the 175 * case of an error (or for 'special' options like --list-cmds or --list-opts). 176 */ 177 extern int parse_options(int argc, const char **argv, 178 const struct option *options, 179 const char * const usagestr[], int flags); 180 181 extern int parse_options_subcommand(int argc, const char **argv, 182 const struct option *options, 183 const char *const subcommands[], 184 const char *usagestr[], int flags); 185 186 extern __noreturn void usage_with_options(const char * const *usagestr, 187 const struct option *options); 188 extern __noreturn __attribute__((format(printf,3,4))) 189 void usage_with_options_msg(const char * const *usagestr, 190 const struct option *options, 191 const char *fmt, ...); 192 193 /*----- incremantal advanced APIs -----*/ 194 195 enum { 196 PARSE_OPT_HELP = -1, 197 PARSE_OPT_DONE, 198 PARSE_OPT_LIST_OPTS, 199 PARSE_OPT_LIST_SUBCMDS, 200 PARSE_OPT_UNKNOWN, 201 }; 202 203 /* 204 * It's okay for the caller to consume argv/argc in the usual way. 205 * Other fields of that structure are private to parse-options and should not 206 * be modified in any way. 207 */ 208 struct parse_opt_ctx_t { 209 const char **argv; 210 const char **out; 211 int argc, cpidx; 212 const char *opt; 213 const struct option *excl_opt; 214 int flags; 215 }; 216 217 extern int parse_options_usage(const char * const *usagestr, 218 const struct option *opts, 219 const char *optstr, 220 bool short_opt); 221 222 223 /*----- some often used options -----*/ 224 extern int parse_opt_abbrev_cb(const struct option *, const char *, int); 225 extern int parse_opt_approxidate_cb(const struct option *, const char *, int); 226 extern int parse_opt_verbosity_cb(const struct option *, const char *, int); 227 228 #define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose") 229 #define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet") 230 #define OPT__VERBOSITY(var) \ 231 { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \ 232 PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \ 233 { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \ 234 PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 } 235 #define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run") 236 #define OPT__ABBREV(var) \ 237 { OPTION_CALLBACK, 0, "abbrev", (var), "n", \ 238 "use <n> digits to display SHA-1s", \ 239 PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 } 240 241 extern const char *parse_options_fix_filename(const char *prefix, const char *file); 242 243 void set_option_flag(struct option *opts, int sopt, const char *lopt, int flag); 244 void set_option_nobuild(struct option *opts, int shortopt, const char *longopt, 245 const char *build_opt, bool can_skip); 246 247 #endif /* __SUBCMD_PARSE_OPTIONS_H */ 248