f324d7fb130355a42ef07583cfcd520f09f2e324
[argpar.git] / argpar / argpar.c
1 /*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright (c) 2019-2021 Philippe Proulx <pproulx@efficios.com>
5 * Copyright (c) 2020-2021 Simon Marchi <simon.marchi@efficios.com>
6 */
7
8 #include <assert.h>
9 #include <stdarg.h>
10 #include <stdbool.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14
15 #include "argpar.h"
16
17 #define ARGPAR_REALLOC(_ptr, _type, _nmemb) \
18 ((_type *) realloc(_ptr, (_nmemb) * sizeof(_type)))
19
20 #define ARGPAR_CALLOC(_type, _nmemb) \
21 ((_type *) calloc((_nmemb), sizeof(_type)))
22
23 #define ARGPAR_ZALLOC(_type) ARGPAR_CALLOC(_type, 1)
24
25 #define ARGPAR_ASSERT(_cond) assert(_cond)
26
27 #ifdef __MINGW_PRINTF_FORMAT
28 # define ARGPAR_PRINTF_FORMAT __MINGW_PRINTF_FORMAT
29 #else
30 # define ARGPAR_PRINTF_FORMAT printf
31 #endif
32
33 /*
34 * An argpar iterator.
35 *
36 * Such a structure contains the state of an iterator between calls to
37 * argpar_iter_next().
38 */
39 struct argpar_iter {
40 /*
41 * Data provided by the user to argpar_iter_create(); immutable
42 * afterwards.
43 */
44 unsigned int argc;
45 const char * const *argv;
46 const struct argpar_opt_descr *descrs;
47
48 /*
49 * Index of the argument to process in the next
50 * argpar_iter_next() call.
51 */
52 unsigned int i;
53
54 /* Counter of non-option arguments */
55 int non_opt_index;
56
57 /*
58 * Current character of the current short option group: if it's
59 * not `NULL`, the parser is in within a short option group,
60 * therefore it must resume there in the next
61 * argpar_iter_next() call.
62 */
63 const char *short_opt_ch;
64 };
65
66 /* Base parsing item */
67 struct argpar_item {
68 enum argpar_item_type type;
69 };
70
71 /* Option parsing item */
72 struct argpar_item_opt {
73 struct argpar_item base;
74
75 /* Corresponding descriptor */
76 const struct argpar_opt_descr *descr;
77
78 /* Argument, or `NULL` if none; owned by this */
79 char *arg;
80 };
81
82 /* Non-option parsing item */
83 struct argpar_item_non_opt {
84 struct argpar_item base;
85
86 /*
87 * Complete argument, pointing to one of the entries of the
88 * original arguments (`argv`).
89 */
90 const char *arg;
91
92 /*
93 * Index of this argument amongst all original arguments
94 * (`argv`).
95 */
96 unsigned int orig_index;
97
98 /* Index of this argument amongst other non-option arguments */
99 unsigned int non_opt_index;
100 };
101
102 static __attribute__((format(ARGPAR_PRINTF_FORMAT, 1, 0)))
103 char *argpar_vasprintf(const char * const fmt, va_list args)
104 {
105 int len1, len2;
106 char *str;
107 va_list args2;
108
109 va_copy(args2, args);
110 len1 = vsnprintf(NULL, 0, fmt, args);
111 if (len1 < 0) {
112 str = NULL;
113 goto end;
114 }
115
116 str = malloc(len1 + 1);
117 if (!str) {
118 goto end;
119 }
120
121 len2 = vsnprintf(str, len1 + 1, fmt, args2);
122 ARGPAR_ASSERT(len1 == len2);
123
124 end:
125 va_end(args2);
126 return str;
127 }
128
129
130 static __attribute__((format(ARGPAR_PRINTF_FORMAT, 1, 2)))
131 char *argpar_asprintf(const char * const fmt, ...)
132 {
133 va_list args;
134 char *str;
135
136 va_start(args, fmt);
137 str = argpar_vasprintf(fmt, args);
138 va_end(args);
139 return str;
140 }
141
142 static __attribute__((format(ARGPAR_PRINTF_FORMAT, 2, 3)))
143 bool try_append_string_printf(char ** const str, const char *fmt, ...)
144 {
145 char *new_str = NULL;
146 char *addendum = NULL;
147 bool success;
148 va_list args;
149
150 if (!str) {
151 success = true;
152 goto end;
153 }
154
155 ARGPAR_ASSERT(str);
156 va_start(args, fmt);
157 addendum = argpar_vasprintf(fmt, args);
158 va_end(args);
159
160 if (!addendum) {
161 success = false;
162 goto end;
163 }
164
165 new_str = argpar_asprintf("%s%s", *str ? *str : "", addendum);
166 if (!new_str) {
167 success = false;
168 goto end;
169 }
170
171 free(*str);
172 *str = new_str;
173 success = true;
174
175 end:
176 free(addendum);
177 return success;
178 }
179
180 ARGPAR_HIDDEN
181 enum argpar_item_type argpar_item_type(const struct argpar_item * const item)
182 {
183 ARGPAR_ASSERT(item);
184 return item->type;
185 }
186
187 ARGPAR_HIDDEN
188 const struct argpar_opt_descr *argpar_item_opt_descr(
189 const struct argpar_item * const item)
190 {
191 ARGPAR_ASSERT(item);
192 ARGPAR_ASSERT(item->type == ARGPAR_ITEM_TYPE_OPT);
193 return ((const struct argpar_item_opt *) item)->descr;
194 }
195
196 ARGPAR_HIDDEN
197 const char *argpar_item_opt_arg(const struct argpar_item * const item)
198 {
199 ARGPAR_ASSERT(item);
200 ARGPAR_ASSERT(item->type == ARGPAR_ITEM_TYPE_OPT);
201 return ((const struct argpar_item_opt *) item)->arg;
202 }
203
204 ARGPAR_HIDDEN
205 const char *argpar_item_non_opt_arg(const struct argpar_item * const item)
206 {
207 ARGPAR_ASSERT(item);
208 ARGPAR_ASSERT(item->type == ARGPAR_ITEM_TYPE_NON_OPT);
209 return ((const struct argpar_item_non_opt *) item)->arg;
210 }
211
212 ARGPAR_HIDDEN
213 unsigned int argpar_item_non_opt_orig_index(
214 const struct argpar_item * const item)
215 {
216 ARGPAR_ASSERT(item);
217 ARGPAR_ASSERT(item->type == ARGPAR_ITEM_TYPE_NON_OPT);
218 return ((const struct argpar_item_non_opt *) item)->orig_index;
219 }
220
221 ARGPAR_HIDDEN
222 unsigned int argpar_item_non_opt_non_opt_index(
223 const struct argpar_item * const item)
224 {
225 ARGPAR_ASSERT(item);
226 ARGPAR_ASSERT(item->type == ARGPAR_ITEM_TYPE_NON_OPT);
227 return ((const struct argpar_item_non_opt *) item)->non_opt_index;
228 }
229
230 ARGPAR_HIDDEN
231 void argpar_item_destroy(const struct argpar_item * const item)
232 {
233 if (!item) {
234 goto end;
235 }
236
237 if (item->type == ARGPAR_ITEM_TYPE_OPT) {
238 struct argpar_item_opt * const opt_item =
239 (struct argpar_item_opt *) item;
240
241 free(opt_item->arg);
242 }
243
244 free((void *) item);
245
246 end:
247 return;
248 }
249
250 static
251 bool push_item(struct argpar_item_array * const array,
252 const struct argpar_item * const item)
253 {
254 bool success;
255
256 ARGPAR_ASSERT(array);
257 ARGPAR_ASSERT(item);
258
259 if (array->n_items == array->n_alloc) {
260 const unsigned int new_n_alloc = array->n_alloc * 2;
261 const struct argpar_item ** const new_items =
262 ARGPAR_REALLOC(array->items, const struct argpar_item *,
263 new_n_alloc);
264 if (!new_items) {
265 success = false;
266 goto end;
267 }
268
269 array->n_alloc = new_n_alloc;
270 array->items = new_items;
271 }
272
273 array->items[array->n_items] = item;
274 array->n_items++;
275 success = true;
276
277 end:
278 return success;
279 }
280
281 static
282 void destroy_item_array(struct argpar_item_array * const array)
283 {
284 if (array) {
285 unsigned int i;
286
287 for (i = 0; i < array->n_items; i++) {
288 argpar_item_destroy(array->items[i]);
289 }
290
291 free(array->items);
292 free(array);
293 }
294 }
295
296 static
297 struct argpar_item_array *create_item_array(void)
298 {
299 struct argpar_item_array *ret;
300 const int initial_size = 10;
301
302 ret = ARGPAR_ZALLOC(struct argpar_item_array);
303 if (!ret) {
304 goto end;
305 }
306
307 ret->items = ARGPAR_CALLOC(const struct argpar_item *, initial_size);
308 if (!ret->items) {
309 goto error;
310 }
311
312 ret->n_alloc = initial_size;
313 goto end;
314
315 error:
316 destroy_item_array(ret);
317 ret = NULL;
318
319 end:
320 return ret;
321 }
322
323 static
324 struct argpar_item_opt *create_opt_item(
325 const struct argpar_opt_descr * const descr,
326 const char * const arg)
327 {
328 struct argpar_item_opt *opt_item =
329 ARGPAR_ZALLOC(struct argpar_item_opt);
330
331 if (!opt_item) {
332 goto end;
333 }
334
335 opt_item->base.type = ARGPAR_ITEM_TYPE_OPT;
336 opt_item->descr = descr;
337
338 if (arg) {
339 opt_item->arg = strdup(arg);
340 if (!opt_item->arg) {
341 goto error;
342 }
343 }
344
345 goto end;
346
347 error:
348 argpar_item_destroy(&opt_item->base);
349 opt_item = NULL;
350
351 end:
352 return opt_item;
353 }
354
355 static
356 struct argpar_item_non_opt *create_non_opt_item(const char * const arg,
357 const unsigned int orig_index,
358 const unsigned int non_opt_index)
359 {
360 struct argpar_item_non_opt * const non_opt_item =
361 ARGPAR_ZALLOC(struct argpar_item_non_opt);
362
363 if (!non_opt_item) {
364 goto end;
365 }
366
367 non_opt_item->base.type = ARGPAR_ITEM_TYPE_NON_OPT;
368 non_opt_item->arg = arg;
369 non_opt_item->orig_index = orig_index;
370 non_opt_item->non_opt_index = non_opt_index;
371
372 end:
373 return non_opt_item;
374 }
375
376 static
377 const struct argpar_opt_descr *find_descr(
378 const struct argpar_opt_descr * const descrs,
379 const char short_name, const char * const long_name)
380 {
381 const struct argpar_opt_descr *descr;
382
383 for (descr = descrs; descr->short_name || descr->long_name; descr++) {
384 if (short_name && descr->short_name &&
385 short_name == descr->short_name) {
386 goto end;
387 }
388
389 if (long_name && descr->long_name &&
390 strcmp(long_name, descr->long_name) == 0) {
391 goto end;
392 }
393 }
394
395 end:
396 return !descr->short_name && !descr->long_name ? NULL : descr;
397 }
398
399 enum parse_orig_arg_opt_ret {
400 PARSE_ORIG_ARG_OPT_RET_OK,
401 PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT = -1,
402 PARSE_ORIG_ARG_OPT_RET_ERROR_MISSING_OPT_ARG = -2,
403 PARSE_ORIG_ARG_OPT_RET_ERROR_INVALID_ARG = -3,
404 PARSE_ORIG_ARG_OPT_RET_ERROR_UNEXPECTED_OPT_ARG = -4,
405 PARSE_ORIG_ARG_OPT_RET_ERROR_MEMORY = -5,
406 };
407
408 static
409 enum parse_orig_arg_opt_ret parse_short_opts(const char * const short_opts,
410 const char * const next_orig_arg,
411 const struct argpar_opt_descr * const descrs,
412 struct argpar_iter * const iter,
413 char ** const error, struct argpar_item ** const item)
414 {
415 enum parse_orig_arg_opt_ret ret = PARSE_ORIG_ARG_OPT_RET_OK;
416 bool used_next_orig_arg = false;
417 const char *opt_arg = NULL;
418 const struct argpar_opt_descr *descr;
419 struct argpar_item_opt *opt_item;
420
421 if (strlen(short_opts) == 0) {
422 try_append_string_printf(error, "Invalid argument");
423 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_INVALID_ARG;
424 goto error;
425 }
426
427 if (!iter->short_opt_ch) {
428 iter->short_opt_ch = short_opts;
429 }
430
431 /* Find corresponding option descriptor */
432 descr = find_descr(descrs, *iter->short_opt_ch, NULL);
433 if (!descr) {
434 try_append_string_printf(error, "Unknown option `-%c`",
435 *iter->short_opt_ch);
436 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT;
437 goto error;
438 }
439
440 if (descr->with_arg) {
441 if (iter->short_opt_ch[1]) {
442 /* `-oarg` form */
443 opt_arg = &iter->short_opt_ch[1];
444 } else {
445 /* `-o arg` form */
446 opt_arg = next_orig_arg;
447 used_next_orig_arg = true;
448 }
449
450 /*
451 * We accept `-o ''` (empty option argument), but not
452 * `-o` alone if an option argument is expected.
453 */
454 if (!opt_arg || (iter->short_opt_ch[1] &&
455 strlen(opt_arg) == 0)) {
456 try_append_string_printf(error,
457 "Missing required argument for option `-%c`",
458 *iter->short_opt_ch);
459 used_next_orig_arg = false;
460 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_MISSING_OPT_ARG;
461 goto error;
462 }
463 }
464
465 /* Create and append option argument */
466 opt_item = create_opt_item(descr, opt_arg);
467 if (!opt_item) {
468 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_MEMORY;
469 goto error;
470 }
471
472 *item = &opt_item->base;
473 iter->short_opt_ch++;
474
475 if (descr->with_arg || !*iter->short_opt_ch) {
476 /* Option has an argument: no more options */
477 iter->short_opt_ch = NULL;
478
479 if (used_next_orig_arg) {
480 iter->i += 2;
481 } else {
482 iter->i++;
483 }
484 }
485
486 goto end;
487
488 error:
489 ARGPAR_ASSERT(ret != PARSE_ORIG_ARG_OPT_RET_OK);
490
491 end:
492 return ret;
493 }
494
495 static
496 enum parse_orig_arg_opt_ret parse_long_opt(const char * const long_opt_arg,
497 const char * const next_orig_arg,
498 const struct argpar_opt_descr * const descrs,
499 struct argpar_iter * const iter,
500 char ** const error, struct argpar_item ** const item)
501 {
502 const size_t max_len = 127;
503 enum parse_orig_arg_opt_ret ret = PARSE_ORIG_ARG_OPT_RET_OK;
504 const struct argpar_opt_descr *descr;
505 struct argpar_item_opt *opt_item;
506 bool used_next_orig_arg = false;
507
508 /* Option's argument, if any */
509 const char *opt_arg = NULL;
510
511 /* Position of first `=`, if any */
512 const char *eq_pos;
513
514 /* Buffer holding option name when `long_opt_arg` contains `=` */
515 char buf[max_len + 1];
516
517 /* Option name */
518 const char *long_opt_name = long_opt_arg;
519
520 if (strlen(long_opt_arg) == 0) {
521 try_append_string_printf(error, "Invalid argument");
522 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_INVALID_ARG;
523 goto error;
524 }
525
526 /* Find the first `=` in original argument */
527 eq_pos = strchr(long_opt_arg, '=');
528 if (eq_pos) {
529 const size_t long_opt_name_size = eq_pos - long_opt_arg;
530
531 /* Isolate the option name */
532 if (long_opt_name_size > max_len) {
533 try_append_string_printf(error,
534 "Invalid argument `--%s`", long_opt_arg);
535 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_INVALID_ARG;
536 goto error;
537 }
538
539 memcpy(buf, long_opt_arg, long_opt_name_size);
540 buf[long_opt_name_size] = '\0';
541 long_opt_name = buf;
542 }
543
544 /* Find corresponding option descriptor */
545 descr = find_descr(descrs, '\0', long_opt_name);
546 if (!descr) {
547 try_append_string_printf(error, "Unknown option `--%s`",
548 long_opt_name);
549 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT;
550 goto error;
551 }
552
553 /* Find option's argument if any */
554 if (descr->with_arg) {
555 if (eq_pos) {
556 /* `--long-opt=arg` style */
557 opt_arg = eq_pos + 1;
558 } else {
559 /* `--long-opt arg` style */
560 if (!next_orig_arg) {
561 try_append_string_printf(error,
562 "Missing required argument for option `--%s`",
563 long_opt_name);
564 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_MISSING_OPT_ARG;
565 goto error;
566 }
567
568 opt_arg = next_orig_arg;
569 used_next_orig_arg = true;
570 }
571 } else if (eq_pos) {
572 /*
573 * Unexpected `--opt=arg` style for a long option which
574 * doesn't accept an argument.
575 */
576 try_append_string_printf(error,
577 "Unexpected argument for option `--%s`", long_opt_name);
578 ret = PARSE_ORIG_ARG_OPT_RET_ERROR_UNEXPECTED_OPT_ARG;
579 goto error;
580 }
581
582 /* Create and append option argument */
583 opt_item = create_opt_item(descr, opt_arg);
584 if (!opt_item) {
585 goto error;
586 }
587
588 if (used_next_orig_arg) {
589 iter->i += 2;
590 } else {
591 iter->i++;
592 }
593
594 *item = &opt_item->base;
595 goto end;
596
597 error:
598 ARGPAR_ASSERT(ret != PARSE_ORIG_ARG_OPT_RET_OK);
599
600 end:
601 return ret;
602 }
603
604 static
605 enum parse_orig_arg_opt_ret parse_orig_arg_opt(const char * const orig_arg,
606 const char * const next_orig_arg,
607 const struct argpar_opt_descr * const descrs,
608 struct argpar_iter * const iter, char ** const error,
609 struct argpar_item ** const item)
610 {
611 enum parse_orig_arg_opt_ret ret = PARSE_ORIG_ARG_OPT_RET_OK;
612
613 ARGPAR_ASSERT(orig_arg[0] == '-');
614
615 if (orig_arg[1] == '-') {
616 /* Long option */
617 ret = parse_long_opt(&orig_arg[2],
618 next_orig_arg, descrs, iter, error, item);
619 } else {
620 /* Short option */
621 ret = parse_short_opts(&orig_arg[1],
622 next_orig_arg, descrs, iter, error, item);
623 }
624
625 return ret;
626 }
627
628 static
629 bool try_prepend_while_parsing_arg_to_error(char ** const error,
630 const unsigned int i, const char * const arg)
631 {
632 char *new_error;
633 bool success;
634
635 if (!error) {
636 success = true;
637 goto end;
638 }
639
640 ARGPAR_ASSERT(*error);
641 new_error = argpar_asprintf("While parsing argument #%u (`%s`): %s",
642 i + 1, arg, *error);
643 if (!new_error) {
644 success = false;
645 goto end;
646 }
647
648 free(*error);
649 *error = new_error;
650 success = true;
651
652 end:
653 return success;
654 }
655
656 ARGPAR_HIDDEN
657 struct argpar_iter *argpar_iter_create(const unsigned int argc,
658 const char * const * const argv,
659 const struct argpar_opt_descr * const descrs)
660 {
661 struct argpar_iter * const iter = ARGPAR_ZALLOC(struct argpar_iter);
662
663 if (!iter) {
664 goto end;
665 }
666
667 iter->argc = argc;
668 iter->argv = argv;
669 iter->descrs = descrs;
670
671 end:
672 return iter;
673 }
674
675 ARGPAR_HIDDEN
676 void argpar_iter_destroy(struct argpar_iter * const iter)
677 {
678 free(iter);
679 }
680
681 ARGPAR_HIDDEN
682 enum argpar_iter_next_status argpar_iter_next(
683 struct argpar_iter * const iter,
684 const struct argpar_item ** const item, char ** const error)
685 {
686 enum argpar_iter_next_status status;
687 enum parse_orig_arg_opt_ret parse_orig_arg_opt_ret;
688 const char *orig_arg;
689 const char *next_orig_arg;
690
691 ARGPAR_ASSERT(iter->i <= iter->argc);
692
693 if (error) {
694 *error = NULL;
695 }
696
697 if (iter->i == iter->argc) {
698 status = ARGPAR_ITER_NEXT_STATUS_END;
699 goto end;
700 }
701
702 orig_arg = iter->argv[iter->i];
703 next_orig_arg =
704 iter->i < (iter->argc - 1) ? iter->argv[iter->i + 1] : NULL;
705
706 if (orig_arg[0] != '-') {
707 /* Non-option argument */
708 struct argpar_item_non_opt * const non_opt_item =
709 create_non_opt_item(orig_arg, iter->i,
710 iter->non_opt_index);
711
712 if (!non_opt_item) {
713 status = ARGPAR_ITER_NEXT_STATUS_ERROR_MEMORY;
714 goto end;
715 }
716
717 iter->non_opt_index++;
718 iter->i++;
719 *item = &non_opt_item->base;
720 status = ARGPAR_ITER_NEXT_STATUS_OK;
721 goto end;
722 }
723
724 /* Option argument */
725 parse_orig_arg_opt_ret = parse_orig_arg_opt(orig_arg,
726 next_orig_arg, iter->descrs, iter, error,
727 (struct argpar_item **) item);
728 switch (parse_orig_arg_opt_ret) {
729 case PARSE_ORIG_ARG_OPT_RET_OK:
730 status = ARGPAR_ITER_NEXT_STATUS_OK;
731 break;
732 case PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT:
733 case PARSE_ORIG_ARG_OPT_RET_ERROR_MISSING_OPT_ARG:
734 case PARSE_ORIG_ARG_OPT_RET_ERROR_INVALID_ARG:
735 case PARSE_ORIG_ARG_OPT_RET_ERROR_UNEXPECTED_OPT_ARG:
736 try_prepend_while_parsing_arg_to_error(error, iter->i,
737 orig_arg);
738
739 switch (parse_orig_arg_opt_ret) {
740 case PARSE_ORIG_ARG_OPT_RET_ERROR_UNKNOWN_OPT:
741 status = ARGPAR_ITER_NEXT_STATUS_ERROR_UNKNOWN_OPT;
742 break;
743 case PARSE_ORIG_ARG_OPT_RET_ERROR_MISSING_OPT_ARG:
744 status = ARGPAR_ITER_NEXT_STATUS_ERROR_MISSING_OPT_ARG;
745 break;
746 case PARSE_ORIG_ARG_OPT_RET_ERROR_INVALID_ARG:
747 status = ARGPAR_ITER_NEXT_STATUS_ERROR_INVALID_ARG;
748 break;
749 case PARSE_ORIG_ARG_OPT_RET_ERROR_UNEXPECTED_OPT_ARG:
750 status = ARGPAR_ITER_NEXT_STATUS_ERROR_UNEXPECTED_OPT_ARG;
751 break;
752 default:
753 abort();
754 }
755
756 break;
757 case PARSE_ORIG_ARG_OPT_RET_ERROR_MEMORY:
758 status = ARGPAR_ITER_NEXT_STATUS_ERROR_MEMORY;
759 break;
760 default:
761 abort();
762 }
763
764 end:
765 return status;
766 }
767
768 ARGPAR_HIDDEN
769 unsigned int argpar_iter_ingested_orig_args(
770 const struct argpar_iter * const iter)
771 {
772 return iter->i;
773 }
774
775 ARGPAR_HIDDEN
776 struct argpar_parse_ret argpar_parse(const unsigned int argc,
777 const char * const * const argv,
778 const struct argpar_opt_descr * const descrs,
779 const bool fail_on_unknown_opt)
780 {
781 struct argpar_parse_ret parse_ret = { 0 };
782 const struct argpar_item *item = NULL;
783 struct argpar_iter *iter = NULL;
784
785 parse_ret.items = create_item_array();
786 if (!parse_ret.items) {
787 parse_ret.error = strdup("Failed to create items array.");
788 ARGPAR_ASSERT(parse_ret.error);
789 goto error;
790 }
791
792 iter = argpar_iter_create(argc, argv, descrs);
793 if (!iter) {
794 parse_ret.error = strdup("Failed to create argpar iter.");
795 ARGPAR_ASSERT(parse_ret.error);
796 goto error;
797 }
798
799 while (true) {
800 const enum argpar_iter_next_status status =
801 argpar_iter_next(iter, &item, &parse_ret.error);
802
803 switch (status) {
804 case ARGPAR_ITER_NEXT_STATUS_ERROR_MISSING_OPT_ARG:
805 case ARGPAR_ITER_NEXT_STATUS_ERROR_INVALID_ARG:
806 case ARGPAR_ITER_NEXT_STATUS_ERROR_UNEXPECTED_OPT_ARG:
807 case ARGPAR_ITER_NEXT_STATUS_ERROR_MEMORY:
808 goto error;
809 case ARGPAR_ITER_NEXT_STATUS_ERROR_UNKNOWN_OPT:
810 if (fail_on_unknown_opt) {
811 parse_ret.ingested_orig_args =
812 argpar_iter_ingested_orig_args(iter);
813 goto error;
814 }
815
816 free(parse_ret.error);
817 parse_ret.error = NULL;
818 goto success;
819 case ARGPAR_ITER_NEXT_STATUS_END:
820 goto success;
821 default:
822 ARGPAR_ASSERT(status == ARGPAR_ITER_NEXT_STATUS_OK);
823 break;
824 }
825
826 if (!push_item(parse_ret.items, item)) {
827 goto error;
828 }
829
830 item = NULL;
831 }
832
833 success:
834 ARGPAR_ASSERT(!parse_ret.error);
835 parse_ret.ingested_orig_args = argpar_iter_ingested_orig_args(iter);
836 goto end;
837
838 error:
839 ARGPAR_ASSERT(parse_ret.error);
840
841 /* That's how we indicate that an error occurred */
842 destroy_item_array(parse_ret.items);
843 parse_ret.items = NULL;
844
845 end:
846 argpar_iter_destroy(iter);
847 argpar_item_destroy(item);
848 return parse_ret;
849 }
850
851 ARGPAR_HIDDEN
852 void argpar_parse_ret_fini(struct argpar_parse_ret * const ret)
853 {
854 ARGPAR_ASSERT(ret);
855 destroy_item_array(ret->items);
856 ret->items = NULL;
857 free(ret->error);
858 ret->error = NULL;
859 }
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