| 1 | /* |
| 2 | * Copyright 2019 Philippe Proulx <pproulx@efficios.com> |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 5 | * of this software and associated documentation files (the "Software"), to deal |
| 6 | * in the Software without restriction, including without limitation the rights |
| 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 8 | * copies of the Software, and to permit persons to whom the Software is |
| 9 | * furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice shall be included in |
| 12 | * all copies or substantial portions of the Software. |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 20 | * SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <glib.h> |
| 26 | |
| 27 | #include "common/assert.h" |
| 28 | |
| 29 | #include "argpar.h" |
| 30 | |
| 31 | static |
| 32 | void destroy_item(struct bt_argpar_item * const item) |
| 33 | { |
| 34 | if (!item) { |
| 35 | goto end; |
| 36 | } |
| 37 | |
| 38 | if (item->type == BT_ARGPAR_ITEM_TYPE_OPT) { |
| 39 | struct bt_argpar_item_opt * const opt_item = (void *) item; |
| 40 | |
| 41 | g_free((void *) opt_item->arg); |
| 42 | } |
| 43 | |
| 44 | g_free(item); |
| 45 | |
| 46 | end: |
| 47 | return; |
| 48 | } |
| 49 | |
| 50 | static |
| 51 | struct bt_argpar_item_opt *create_opt_item( |
| 52 | const struct bt_argpar_opt_descr * const descr, |
| 53 | const char * const arg) |
| 54 | { |
| 55 | struct bt_argpar_item_opt *opt_item = |
| 56 | g_new0(struct bt_argpar_item_opt, 1); |
| 57 | |
| 58 | if (!opt_item) { |
| 59 | goto end; |
| 60 | } |
| 61 | |
| 62 | opt_item->base.type = BT_ARGPAR_ITEM_TYPE_OPT; |
| 63 | opt_item->descr = descr; |
| 64 | |
| 65 | if (arg) { |
| 66 | opt_item->arg = g_strdup(arg); |
| 67 | if (!opt_item) { |
| 68 | goto error; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | goto end; |
| 73 | |
| 74 | error: |
| 75 | destroy_item(&opt_item->base); |
| 76 | opt_item = NULL; |
| 77 | |
| 78 | end: |
| 79 | return opt_item; |
| 80 | } |
| 81 | |
| 82 | static |
| 83 | struct bt_argpar_item_non_opt *create_non_opt_item(const char * const arg, |
| 84 | const unsigned int orig_index, |
| 85 | const unsigned int non_opt_index) |
| 86 | { |
| 87 | struct bt_argpar_item_non_opt * const non_opt_item = |
| 88 | g_new0(struct bt_argpar_item_non_opt, 1); |
| 89 | |
| 90 | if (!non_opt_item) { |
| 91 | goto end; |
| 92 | } |
| 93 | |
| 94 | non_opt_item->base.type = BT_ARGPAR_ITEM_TYPE_NON_OPT; |
| 95 | non_opt_item->arg = arg; |
| 96 | non_opt_item->orig_index = orig_index; |
| 97 | non_opt_item->non_opt_index = non_opt_index; |
| 98 | |
| 99 | end: |
| 100 | return non_opt_item; |
| 101 | } |
| 102 | |
| 103 | static |
| 104 | const struct bt_argpar_opt_descr *find_descr( |
| 105 | const struct bt_argpar_opt_descr * const descrs, |
| 106 | const char short_name, const char * const long_name) |
| 107 | { |
| 108 | const struct bt_argpar_opt_descr *descr; |
| 109 | |
| 110 | for (descr = descrs; descr->short_name || descr->long_name; descr++) { |
| 111 | if (short_name && descr->short_name && |
| 112 | short_name == descr->short_name) { |
| 113 | goto end; |
| 114 | } |
| 115 | |
| 116 | if (long_name && descr->long_name && |
| 117 | strcmp(long_name, descr->long_name) == 0) { |
| 118 | goto end; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | end: |
| 123 | return !descr->short_name && !descr->long_name ? NULL : descr; |
| 124 | } |
| 125 | |
| 126 | enum parse_orig_arg_opt_ret { |
| 127 | PARSE_ORIG_ARG_OPT_RET_OK, |
| 128 | PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT = -2, |
| 129 | PARSE_ORIG_ARG_OPT_RET_ERROR = -1, |
| 130 | }; |
| 131 | |
| 132 | static |
| 133 | enum parse_orig_arg_opt_ret parse_short_opts(const char * const short_opts, |
| 134 | const char * const next_orig_arg, |
| 135 | const struct bt_argpar_opt_descr * const descrs, |
| 136 | struct bt_argpar_parse_ret * const parse_ret, |
| 137 | bool * const used_next_orig_arg) |
| 138 | { |
| 139 | enum parse_orig_arg_opt_ret ret = PARSE_ORIG_ARG_OPT_RET_OK; |
| 140 | const char *short_opt_ch = short_opts; |
| 141 | |
| 142 | if (strlen(short_opts) == 0) { |
| 143 | g_string_append(parse_ret->error, "Invalid argument"); |
| 144 | goto error; |
| 145 | } |
| 146 | |
| 147 | while (*short_opt_ch) { |
| 148 | const char *opt_arg = NULL; |
| 149 | const struct bt_argpar_opt_descr *descr; |
| 150 | struct bt_argpar_item_opt *opt_item; |
| 151 | |
| 152 | /* Find corresponding option descriptor */ |
| 153 | descr = find_descr(descrs, *short_opt_ch, NULL); |
| 154 | if (!descr) { |
| 155 | ret = PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT; |
| 156 | g_string_append_printf(parse_ret->error, |
| 157 | "Unknown option `-%c`", *short_opt_ch); |
| 158 | goto error; |
| 159 | } |
| 160 | |
| 161 | if (descr->with_arg) { |
| 162 | if (short_opt_ch[1]) { |
| 163 | /* `-oarg` form */ |
| 164 | opt_arg = &short_opt_ch[1]; |
| 165 | } else { |
| 166 | /* `-o arg` form */ |
| 167 | opt_arg = next_orig_arg; |
| 168 | *used_next_orig_arg = true; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * We accept `-o ''` (empty option's argument), |
| 173 | * but not `-o` alone if an option's argument is |
| 174 | * expected. |
| 175 | */ |
| 176 | if (!opt_arg || (short_opt_ch[1] && strlen(opt_arg) == 0)) { |
| 177 | g_string_append_printf(parse_ret->error, |
| 178 | "Missing required argument for option `-%c`", |
| 179 | *short_opt_ch); |
| 180 | *used_next_orig_arg = false; |
| 181 | goto error; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /* Create and append option argument */ |
| 186 | opt_item = create_opt_item(descr, opt_arg); |
| 187 | if (!opt_item) { |
| 188 | goto error; |
| 189 | } |
| 190 | |
| 191 | g_ptr_array_add(parse_ret->items, opt_item); |
| 192 | |
| 193 | if (descr->with_arg) { |
| 194 | /* Option has an argument: no more options */ |
| 195 | break; |
| 196 | } |
| 197 | |
| 198 | /* Go to next short option */ |
| 199 | short_opt_ch++; |
| 200 | } |
| 201 | |
| 202 | goto end; |
| 203 | |
| 204 | error: |
| 205 | if (ret == PARSE_ORIG_ARG_OPT_RET_OK) { |
| 206 | ret = PARSE_ORIG_ARG_OPT_RET_ERROR; |
| 207 | } |
| 208 | |
| 209 | end: |
| 210 | return ret; |
| 211 | } |
| 212 | |
| 213 | static |
| 214 | enum parse_orig_arg_opt_ret parse_long_opt(const char * const long_opt_arg, |
| 215 | const char * const next_orig_arg, |
| 216 | const struct bt_argpar_opt_descr * const descrs, |
| 217 | struct bt_argpar_parse_ret * const parse_ret, |
| 218 | bool * const used_next_orig_arg) |
| 219 | { |
| 220 | const size_t max_len = 127; |
| 221 | enum parse_orig_arg_opt_ret ret = PARSE_ORIG_ARG_OPT_RET_OK; |
| 222 | const struct bt_argpar_opt_descr *descr; |
| 223 | struct bt_argpar_item_opt *opt_item; |
| 224 | |
| 225 | /* Option's argument, if any */ |
| 226 | const char *opt_arg = NULL; |
| 227 | |
| 228 | /* Position of first `=`, if any */ |
| 229 | const char *eq_pos; |
| 230 | |
| 231 | /* Buffer holding option name when `long_opt_arg` contains `=` */ |
| 232 | char buf[max_len + 1]; |
| 233 | |
| 234 | /* Option name */ |
| 235 | const char *long_opt_name = long_opt_arg; |
| 236 | |
| 237 | if (strlen(long_opt_arg) == 0) { |
| 238 | g_string_append(parse_ret->error, "Invalid argument"); |
| 239 | goto error; |
| 240 | } |
| 241 | |
| 242 | /* Find the first `=` in original argument */ |
| 243 | eq_pos = strchr(long_opt_arg, '='); |
| 244 | if (eq_pos) { |
| 245 | const size_t long_opt_name_size = eq_pos - long_opt_arg; |
| 246 | |
| 247 | /* Isolate the option name */ |
| 248 | if (long_opt_name_size > max_len) { |
| 249 | g_string_append_printf(parse_ret->error, |
| 250 | "Invalid argument `--%s`", long_opt_arg); |
| 251 | goto error; |
| 252 | } |
| 253 | |
| 254 | memcpy(buf, long_opt_arg, long_opt_name_size); |
| 255 | buf[long_opt_name_size] = '\0'; |
| 256 | long_opt_name = buf; |
| 257 | } |
| 258 | |
| 259 | /* Find corresponding option descriptor */ |
| 260 | descr = find_descr(descrs, '\0', long_opt_name); |
| 261 | if (!descr) { |
| 262 | g_string_append_printf(parse_ret->error, |
| 263 | "Unknown option `--%s`", long_opt_name); |
| 264 | ret = PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT; |
| 265 | goto error; |
| 266 | } |
| 267 | |
| 268 | /* Find option's argument if any */ |
| 269 | if (descr->with_arg) { |
| 270 | if (eq_pos) { |
| 271 | /* `--long-opt=arg` style */ |
| 272 | opt_arg = eq_pos + 1; |
| 273 | } else { |
| 274 | /* `--long-opt arg` style */ |
| 275 | if (!next_orig_arg) { |
| 276 | g_string_append_printf(parse_ret->error, |
| 277 | "Missing required argument for option `--%s`", |
| 278 | long_opt_name); |
| 279 | goto error; |
| 280 | } |
| 281 | |
| 282 | opt_arg = next_orig_arg; |
| 283 | *used_next_orig_arg = true; |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | /* Create and append option argument */ |
| 288 | opt_item = create_opt_item(descr, opt_arg); |
| 289 | if (!opt_item) { |
| 290 | goto error; |
| 291 | } |
| 292 | |
| 293 | g_ptr_array_add(parse_ret->items, opt_item); |
| 294 | goto end; |
| 295 | |
| 296 | error: |
| 297 | if (ret == PARSE_ORIG_ARG_OPT_RET_OK) { |
| 298 | ret = PARSE_ORIG_ARG_OPT_RET_ERROR; |
| 299 | } |
| 300 | |
| 301 | end: |
| 302 | return ret; |
| 303 | } |
| 304 | |
| 305 | static |
| 306 | enum parse_orig_arg_opt_ret parse_orig_arg_opt(const char * const orig_arg, |
| 307 | const char * const next_orig_arg, |
| 308 | const struct bt_argpar_opt_descr * const descrs, |
| 309 | struct bt_argpar_parse_ret * const parse_ret, |
| 310 | bool * const used_next_orig_arg) |
| 311 | { |
| 312 | enum parse_orig_arg_opt_ret ret = PARSE_ORIG_ARG_OPT_RET_OK; |
| 313 | |
| 314 | BT_ASSERT(orig_arg[0] == '-'); |
| 315 | |
| 316 | if (orig_arg[1] == '-') { |
| 317 | /* Long option */ |
| 318 | ret = parse_long_opt(&orig_arg[2], |
| 319 | next_orig_arg, descrs, parse_ret, |
| 320 | used_next_orig_arg); |
| 321 | } else { |
| 322 | /* Short option */ |
| 323 | ret = parse_short_opts(&orig_arg[1], |
| 324 | next_orig_arg, descrs, parse_ret, |
| 325 | used_next_orig_arg); |
| 326 | } |
| 327 | |
| 328 | return ret; |
| 329 | } |
| 330 | |
| 331 | static |
| 332 | void prepend_while_parsing_arg_to_error(GString * const error, |
| 333 | const unsigned int i, const char * const arg) |
| 334 | { |
| 335 | /* 🙁 There's no g_string_prepend_printf()! */ |
| 336 | GString * const tmp_str = g_string_new(NULL); |
| 337 | |
| 338 | BT_ASSERT(error); |
| 339 | BT_ASSERT(arg); |
| 340 | |
| 341 | if (!tmp_str) { |
| 342 | goto end; |
| 343 | } |
| 344 | |
| 345 | g_string_append_printf(tmp_str, "While parsing argument #%u (`%s`): %s", |
| 346 | i + 1, arg, error->str); |
| 347 | g_string_assign(error, tmp_str->str); |
| 348 | g_string_free(tmp_str, TRUE); |
| 349 | |
| 350 | end: |
| 351 | return; |
| 352 | } |
| 353 | |
| 354 | BT_HIDDEN |
| 355 | struct bt_argpar_parse_ret bt_argpar_parse(unsigned int argc, |
| 356 | const char * const *argv, |
| 357 | const struct bt_argpar_opt_descr * const descrs, |
| 358 | bool fail_on_unknown_opt) |
| 359 | { |
| 360 | struct bt_argpar_parse_ret parse_ret = { 0 }; |
| 361 | unsigned int i; |
| 362 | unsigned int non_opt_index = 0; |
| 363 | |
| 364 | parse_ret.error = g_string_new(NULL); |
| 365 | if (!parse_ret.error) { |
| 366 | goto error; |
| 367 | } |
| 368 | |
| 369 | parse_ret.items = g_ptr_array_new_with_free_func( |
| 370 | (GDestroyNotify) destroy_item); |
| 371 | if (!parse_ret.items) { |
| 372 | goto error; |
| 373 | } |
| 374 | |
| 375 | for (i = 0; i < argc; i++) { |
| 376 | enum parse_orig_arg_opt_ret parse_orig_arg_opt_ret; |
| 377 | bool used_next_orig_arg = false; |
| 378 | const char * const orig_arg = argv[i]; |
| 379 | const char * const next_orig_arg = |
| 380 | i < argc - 1 ? argv[i + 1] : NULL; |
| 381 | |
| 382 | if (orig_arg[0] != '-') { |
| 383 | /* Non-option argument */ |
| 384 | struct bt_argpar_item_non_opt *non_opt_item = |
| 385 | create_non_opt_item(orig_arg, i, non_opt_index); |
| 386 | |
| 387 | if (!non_opt_item) { |
| 388 | goto error; |
| 389 | } |
| 390 | |
| 391 | non_opt_index++; |
| 392 | g_ptr_array_add(parse_ret.items, non_opt_item); |
| 393 | continue; |
| 394 | } |
| 395 | |
| 396 | /* Option argument */ |
| 397 | parse_orig_arg_opt_ret = parse_orig_arg_opt(orig_arg, |
| 398 | next_orig_arg, descrs, &parse_ret, &used_next_orig_arg); |
| 399 | switch (parse_orig_arg_opt_ret) { |
| 400 | case PARSE_ORIG_ARG_OPT_RET_OK: |
| 401 | break; |
| 402 | case PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT: |
| 403 | BT_ASSERT(!used_next_orig_arg); |
| 404 | |
| 405 | if (fail_on_unknown_opt) { |
| 406 | prepend_while_parsing_arg_to_error( |
| 407 | parse_ret.error, i, orig_arg); |
| 408 | goto error; |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * The current original argument is not |
| 413 | * considered ingested because it triggered an |
| 414 | * unknown option. |
| 415 | */ |
| 416 | parse_ret.ingested_orig_args = i; |
| 417 | g_string_free(parse_ret.error, TRUE); |
| 418 | parse_ret.error = NULL; |
| 419 | goto end; |
| 420 | case PARSE_ORIG_ARG_OPT_RET_ERROR: |
| 421 | prepend_while_parsing_arg_to_error( |
| 422 | parse_ret.error, i, orig_arg); |
| 423 | goto error; |
| 424 | default: |
| 425 | abort(); |
| 426 | } |
| 427 | |
| 428 | if (used_next_orig_arg) { |
| 429 | i++; |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | parse_ret.ingested_orig_args = argc; |
| 434 | g_string_free(parse_ret.error, TRUE); |
| 435 | parse_ret.error = NULL; |
| 436 | goto end; |
| 437 | |
| 438 | error: |
| 439 | if (parse_ret.items) { |
| 440 | /* That's how we indicate that an error occured */ |
| 441 | g_ptr_array_free(parse_ret.items, TRUE); |
| 442 | parse_ret.items = NULL; |
| 443 | } |
| 444 | |
| 445 | end: |
| 446 | return parse_ret; |
| 447 | } |
| 448 | |
| 449 | BT_HIDDEN |
| 450 | void bt_argpar_parse_ret_fini(struct bt_argpar_parse_ret *ret) |
| 451 | { |
| 452 | BT_ASSERT(ret); |
| 453 | |
| 454 | if (ret->items) { |
| 455 | g_ptr_array_free(ret->items, TRUE); |
| 456 | ret->items = NULL; |
| 457 | } |
| 458 | |
| 459 | if (ret->error) { |
| 460 | g_string_free(ret->error, TRUE); |
| 461 | ret->error = NULL; |
| 462 | } |
| 463 | } |