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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/compiler.h>
3#include <linux/string.h>
4#include <linux/types.h>
5#include <stdio.h>
6#include <stdlib.h>
7#include <stdint.h>
8#include <string.h>
9#include <ctype.h>
10#include "subcmd-util.h"
11#include "parse-options.h"
12#include "subcmd-config.h"
13#include "pager.h"
14
15#define OPT_SHORT 1
16#define OPT_UNSET 2
17
18char *error_buf;
19
20static int opterror(const struct option *opt, const char *reason, int flags)
21{
22 if (flags & OPT_SHORT)
23 fprintf(stderr, " Error: switch `%c' %s", opt->short_name, reason);
24 else if (flags & OPT_UNSET)
25 fprintf(stderr, " Error: option `no-%s' %s", opt->long_name, reason);
26 else
27 fprintf(stderr, " Error: option `%s' %s", opt->long_name, reason);
28
29 return -1;
30}
31
32static const char *skip_prefix(const char *str, const char *prefix)
33{
34 size_t len = strlen(prefix);
35 return strncmp(str, prefix, len) ? NULL : str + len;
36}
37
38static void optwarning(const struct option *opt, const char *reason, int flags)
39{
40 if (flags & OPT_SHORT)
41 fprintf(stderr, " Warning: switch `%c' %s", opt->short_name, reason);
42 else if (flags & OPT_UNSET)
43 fprintf(stderr, " Warning: option `no-%s' %s", opt->long_name, reason);
44 else
45 fprintf(stderr, " Warning: option `%s' %s", opt->long_name, reason);
46}
47
48static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
49 int flags, const char **arg)
50{
51 const char *res;
52
53 if (p->opt) {
54 res = p->opt;
55 p->opt = NULL;
56 } else if ((opt->flags & PARSE_OPT_LASTARG_DEFAULT) && (p->argc == 1 ||
57 **(p->argv + 1) == '-')) {
58 res = (const char *)opt->defval;
59 } else if (p->argc > 1) {
60 p->argc--;
61 res = *++p->argv;
62 } else
63 return opterror(opt, "requires a value", flags);
64 if (arg)
65 *arg = res;
66 return 0;
67}
68
69static int get_value(struct parse_opt_ctx_t *p,
70 const struct option *opt, int flags)
71{
72 const char *s, *arg = NULL;
73 const int unset = flags & OPT_UNSET;
74 int err;
75
76 if (unset && p->opt)
77 return opterror(opt, "takes no value", flags);
78 if (unset && (opt->flags & PARSE_OPT_NONEG))
79 return opterror(opt, "isn't available", flags);
80 if (opt->flags & PARSE_OPT_DISABLED)
81 return opterror(opt, "is not usable", flags);
82
83 if (opt->flags & PARSE_OPT_EXCLUSIVE) {
84 if (p->excl_opt && p->excl_opt != opt) {
85 char msg[128];
86
87 if (((flags & OPT_SHORT) && p->excl_opt->short_name) ||
88 p->excl_opt->long_name == NULL) {
89 snprintf(msg, sizeof(msg), "cannot be used with switch `%c'",
90 p->excl_opt->short_name);
91 } else {
92 snprintf(msg, sizeof(msg), "cannot be used with %s",
93 p->excl_opt->long_name);
94 }
95 opterror(opt, msg, flags);
96 return -3;
97 }
98 p->excl_opt = opt;
99 }
100 if (!(flags & OPT_SHORT) && p->opt) {
101 switch (opt->type) {
102 case OPTION_CALLBACK:
103 if (!(opt->flags & PARSE_OPT_NOARG))
104 break;
105 /* FALLTHROUGH */
106 case OPTION_BOOLEAN:
107 case OPTION_INCR:
108 case OPTION_BIT:
109 case OPTION_SET_UINT:
110 case OPTION_SET_PTR:
111 return opterror(opt, "takes no value", flags);
112 case OPTION_END:
113 case OPTION_ARGUMENT:
114 case OPTION_GROUP:
115 case OPTION_STRING:
116 case OPTION_INTEGER:
117 case OPTION_UINTEGER:
118 case OPTION_LONG:
119 case OPTION_ULONG:
120 case OPTION_U64:
121 default:
122 break;
123 }
124 }
125
126 if (opt->flags & PARSE_OPT_NOBUILD) {
127 char reason[128];
128 bool noarg = false;
129
130 err = snprintf(reason, sizeof(reason),
131 opt->flags & PARSE_OPT_CANSKIP ?
132 "is being ignored because %s " :
133 "is not available because %s",
134 opt->build_opt);
135 reason[sizeof(reason) - 1] = '\0';
136
137 if (err < 0)
138 strncpy(reason, opt->flags & PARSE_OPT_CANSKIP ?
139 "is being ignored" :
140 "is not available",
141 sizeof(reason));
142
143 if (!(opt->flags & PARSE_OPT_CANSKIP))
144 return opterror(opt, reason, flags);
145
146 err = 0;
147 if (unset)
148 noarg = true;
149 if (opt->flags & PARSE_OPT_NOARG)
150 noarg = true;
151 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
152 noarg = true;
153
154 switch (opt->type) {
155 case OPTION_BOOLEAN:
156 case OPTION_INCR:
157 case OPTION_BIT:
158 case OPTION_SET_UINT:
159 case OPTION_SET_PTR:
160 case OPTION_END:
161 case OPTION_ARGUMENT:
162 case OPTION_GROUP:
163 noarg = true;
164 break;
165 case OPTION_CALLBACK:
166 case OPTION_STRING:
167 case OPTION_INTEGER:
168 case OPTION_UINTEGER:
169 case OPTION_LONG:
170 case OPTION_ULONG:
171 case OPTION_U64:
172 default:
173 break;
174 }
175
176 if (!noarg)
177 err = get_arg(p, opt, flags, NULL);
178 if (err)
179 return err;
180
181 optwarning(opt, reason, flags);
182 return 0;
183 }
184
185 switch (opt->type) {
186 case OPTION_BIT:
187 if (unset)
188 *(int *)opt->value &= ~opt->defval;
189 else
190 *(int *)opt->value |= opt->defval;
191 return 0;
192
193 case OPTION_BOOLEAN:
194 *(bool *)opt->value = unset ? false : true;
195 if (opt->set)
196 *(bool *)opt->set = true;
197 return 0;
198
199 case OPTION_INCR:
200 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
201 return 0;
202
203 case OPTION_SET_UINT:
204 *(unsigned int *)opt->value = unset ? 0 : opt->defval;
205 return 0;
206
207 case OPTION_SET_PTR:
208 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
209 return 0;
210
211 case OPTION_STRING:
212 err = 0;
213 if (unset)
214 *(const char **)opt->value = NULL;
215 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
216 *(const char **)opt->value = (const char *)opt->defval;
217 else
218 err = get_arg(p, opt, flags, (const char **)opt->value);
219
220 if (opt->set)
221 *(bool *)opt->set = true;
222
223 /* PARSE_OPT_NOEMPTY: Allow NULL but disallow empty string. */
224 if (opt->flags & PARSE_OPT_NOEMPTY) {
225 const char *val = *(const char **)opt->value;
226
227 if (!val)
228 return err;
229
230 /* Similar to unset if we are given an empty string. */
231 if (val[0] == '\0') {
232 *(const char **)opt->value = NULL;
233 return 0;
234 }
235 }
236
237 return err;
238
239 case OPTION_CALLBACK:
240 if (opt->set)
241 *(bool *)opt->set = true;
242
243 if (unset)
244 return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
245 if (opt->flags & PARSE_OPT_NOARG)
246 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
247 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
248 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
249 if (get_arg(p, opt, flags, &arg))
250 return -1;
251 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
252
253 case OPTION_INTEGER:
254 if (unset) {
255 *(int *)opt->value = 0;
256 return 0;
257 }
258 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
259 *(int *)opt->value = opt->defval;
260 return 0;
261 }
262 if (get_arg(p, opt, flags, &arg))
263 return -1;
264 *(int *)opt->value = strtol(arg, (char **)&s, 10);
265 if (*s)
266 return opterror(opt, "expects a numerical value", flags);
267 return 0;
268
269 case OPTION_UINTEGER:
270 if (unset) {
271 *(unsigned int *)opt->value = 0;
272 return 0;
273 }
274 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
275 *(unsigned int *)opt->value = opt->defval;
276 return 0;
277 }
278 if (get_arg(p, opt, flags, &arg))
279 return -1;
280 if (arg[0] == '-')
281 return opterror(opt, "expects an unsigned numerical value", flags);
282 *(unsigned int *)opt->value = strtol(arg, (char **)&s, 10);
283 if (*s)
284 return opterror(opt, "expects a numerical value", flags);
285 return 0;
286
287 case OPTION_LONG:
288 if (unset) {
289 *(long *)opt->value = 0;
290 return 0;
291 }
292 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
293 *(long *)opt->value = opt->defval;
294 return 0;
295 }
296 if (get_arg(p, opt, flags, &arg))
297 return -1;
298 *(long *)opt->value = strtol(arg, (char **)&s, 10);
299 if (*s)
300 return opterror(opt, "expects a numerical value", flags);
301 return 0;
302
303 case OPTION_ULONG:
304 if (unset) {
305 *(unsigned long *)opt->value = 0;
306 return 0;
307 }
308 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
309 *(unsigned long *)opt->value = opt->defval;
310 return 0;
311 }
312 if (get_arg(p, opt, flags, &arg))
313 return -1;
314 *(unsigned long *)opt->value = strtoul(arg, (char **)&s, 10);
315 if (*s)
316 return opterror(opt, "expects a numerical value", flags);
317 return 0;
318
319 case OPTION_U64:
320 if (unset) {
321 *(u64 *)opt->value = 0;
322 return 0;
323 }
324 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
325 *(u64 *)opt->value = opt->defval;
326 return 0;
327 }
328 if (get_arg(p, opt, flags, &arg))
329 return -1;
330 if (arg[0] == '-')
331 return opterror(opt, "expects an unsigned numerical value", flags);
332 *(u64 *)opt->value = strtoull(arg, (char **)&s, 10);
333 if (*s)
334 return opterror(opt, "expects a numerical value", flags);
335 return 0;
336
337 case OPTION_END:
338 case OPTION_ARGUMENT:
339 case OPTION_GROUP:
340 default:
341 die("should not happen, someone must be hit on the forehead");
342 }
343}
344
345static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
346{
347retry:
348 for (; options->type != OPTION_END; options++) {
349 if (options->short_name == *p->opt) {
350 p->opt = p->opt[1] ? p->opt + 1 : NULL;
351 return get_value(p, options, OPT_SHORT);
352 }
353 }
354
355 if (options->parent) {
356 options = options->parent;
357 goto retry;
358 }
359
360 return -2;
361}
362
363static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
364 const struct option *options)
365{
366 const char *arg_end = strchr(arg, '=');
367 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
368 int abbrev_flags = 0, ambiguous_flags = 0;
369
370 if (!arg_end)
371 arg_end = arg + strlen(arg);
372
373retry:
374 for (; options->type != OPTION_END; options++) {
375 const char *rest;
376 int flags = 0;
377
378 if (!options->long_name)
379 continue;
380
381 rest = skip_prefix(arg, options->long_name);
382 if (options->type == OPTION_ARGUMENT) {
383 if (!rest)
384 continue;
385 if (*rest == '=')
386 return opterror(options, "takes no value", flags);
387 if (*rest)
388 continue;
389 p->out[p->cpidx++] = arg - 2;
390 return 0;
391 }
392 if (!rest) {
393 if (strstarts(options->long_name, "no-")) {
394 /*
395 * The long name itself starts with "no-", so
396 * accept the option without "no-" so that users
397 * do not have to enter "no-no-" to get the
398 * negation.
399 */
400 rest = skip_prefix(arg, options->long_name + 3);
401 if (rest) {
402 flags |= OPT_UNSET;
403 goto match;
404 }
405 /* Abbreviated case */
406 if (strstarts(options->long_name + 3, arg)) {
407 flags |= OPT_UNSET;
408 goto is_abbreviated;
409 }
410 }
411 /* abbreviated? */
412 if (!strncmp(options->long_name, arg, arg_end - arg)) {
413is_abbreviated:
414 if (abbrev_option) {
415 /*
416 * If this is abbreviated, it is
417 * ambiguous. So when there is no
418 * exact match later, we need to
419 * error out.
420 */
421 ambiguous_option = abbrev_option;
422 ambiguous_flags = abbrev_flags;
423 }
424 if (!(flags & OPT_UNSET) && *arg_end)
425 p->opt = arg_end + 1;
426 abbrev_option = options;
427 abbrev_flags = flags;
428 continue;
429 }
430 /* negated and abbreviated very much? */
431 if (strstarts("no-", arg)) {
432 flags |= OPT_UNSET;
433 goto is_abbreviated;
434 }
435 /* negated? */
436 if (strncmp(arg, "no-", 3))
437 continue;
438 flags |= OPT_UNSET;
439 rest = skip_prefix(arg + 3, options->long_name);
440 /* abbreviated and negated? */
441 if (!rest && strstarts(options->long_name, arg + 3))
442 goto is_abbreviated;
443 if (!rest)
444 continue;
445 }
446match:
447 if (*rest) {
448 if (*rest != '=')
449 continue;
450 p->opt = rest + 1;
451 }
452 return get_value(p, options, flags);
453 }
454
455 if (ambiguous_option) {
456 fprintf(stderr,
457 " Error: Ambiguous option: %s (could be --%s%s or --%s%s)\n",
458 arg,
459 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
460 ambiguous_option->long_name,
461 (abbrev_flags & OPT_UNSET) ? "no-" : "",
462 abbrev_option->long_name);
463 return -1;
464 }
465 if (abbrev_option)
466 return get_value(p, abbrev_option, abbrev_flags);
467
468 if (options->parent) {
469 options = options->parent;
470 goto retry;
471 }
472
473 return -2;
474}
475
476static void check_typos(const char *arg, const struct option *options)
477{
478 if (strlen(arg) < 3)
479 return;
480
481 if (strstarts(arg, "no-")) {
482 fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)\n", arg);
483 exit(129);
484 }
485
486 for (; options->type != OPTION_END; options++) {
487 if (!options->long_name)
488 continue;
489 if (strstarts(options->long_name, arg)) {
490 fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)\n", arg);
491 exit(129);
492 }
493 }
494}
495
496static void parse_options_start(struct parse_opt_ctx_t *ctx,
497 int argc, const char **argv, int flags)
498{
499 memset(ctx, 0, sizeof(*ctx));
500 ctx->argc = argc - 1;
501 ctx->argv = argv + 1;
502 ctx->out = argv;
503 ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
504 ctx->flags = flags;
505 if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
506 (flags & PARSE_OPT_STOP_AT_NON_OPTION))
507 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
508}
509
510static int usage_with_options_internal(const char * const *,
511 const struct option *, int,
512 struct parse_opt_ctx_t *);
513
514static int parse_options_step(struct parse_opt_ctx_t *ctx,
515 const struct option *options,
516 const char * const usagestr[])
517{
518 int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
519 int excl_short_opt = 1;
520 const char *arg;
521
522 /* we must reset ->opt, unknown short option leave it dangling */
523 ctx->opt = NULL;
524
525 for (; ctx->argc; ctx->argc--, ctx->argv++) {
526 arg = ctx->argv[0];
527 if (*arg != '-' || !arg[1]) {
528 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
529 break;
530 ctx->out[ctx->cpidx++] = ctx->argv[0];
531 continue;
532 }
533
534 if (arg[1] != '-') {
535 ctx->opt = ++arg;
536 if (internal_help && *ctx->opt == 'h') {
537 return usage_with_options_internal(usagestr, options, 0, ctx);
538 }
539 switch (parse_short_opt(ctx, options)) {
540 case -1:
541 return parse_options_usage(usagestr, options, arg, 1);
542 case -2:
543 goto unknown;
544 case -3:
545 goto exclusive;
546 default:
547 break;
548 }
549 if (ctx->opt)
550 check_typos(arg, options);
551 while (ctx->opt) {
552 if (internal_help && *ctx->opt == 'h')
553 return usage_with_options_internal(usagestr, options, 0, ctx);
554 arg = ctx->opt;
555 switch (parse_short_opt(ctx, options)) {
556 case -1:
557 return parse_options_usage(usagestr, options, arg, 1);
558 case -2:
559 /* fake a short option thing to hide the fact that we may have
560 * started to parse aggregated stuff
561 *
562 * This is leaky, too bad.
563 */
564 ctx->argv[0] = strdup(ctx->opt - 1);
565 *(char *)ctx->argv[0] = '-';
566 goto unknown;
567 case -3:
568 goto exclusive;
569 default:
570 break;
571 }
572 }
573 continue;
574 }
575
576 if (!arg[2]) { /* "--" */
577 if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
578 ctx->argc--;
579 ctx->argv++;
580 }
581 break;
582 }
583
584 arg += 2;
585 if (internal_help && !strcmp(arg, "help-all"))
586 return usage_with_options_internal(usagestr, options, 1, ctx);
587 if (internal_help && !strcmp(arg, "help"))
588 return usage_with_options_internal(usagestr, options, 0, ctx);
589 if (!strcmp(arg, "list-opts"))
590 return PARSE_OPT_LIST_OPTS;
591 if (!strcmp(arg, "list-cmds"))
592 return PARSE_OPT_LIST_SUBCMDS;
593 switch (parse_long_opt(ctx, arg, options)) {
594 case -1:
595 return parse_options_usage(usagestr, options, arg, 0);
596 case -2:
597 goto unknown;
598 case -3:
599 excl_short_opt = 0;
600 goto exclusive;
601 default:
602 break;
603 }
604 continue;
605unknown:
606 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
607 return PARSE_OPT_UNKNOWN;
608 ctx->out[ctx->cpidx++] = ctx->argv[0];
609 ctx->opt = NULL;
610 }
611 return PARSE_OPT_DONE;
612
613exclusive:
614 parse_options_usage(usagestr, options, arg, excl_short_opt);
615 if ((excl_short_opt && ctx->excl_opt->short_name) ||
616 ctx->excl_opt->long_name == NULL) {
617 char opt = ctx->excl_opt->short_name;
618 parse_options_usage(NULL, options, &opt, 1);
619 } else {
620 parse_options_usage(NULL, options, ctx->excl_opt->long_name, 0);
621 }
622 return PARSE_OPT_HELP;
623}
624
625static int parse_options_end(struct parse_opt_ctx_t *ctx)
626{
627 memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
628 ctx->out[ctx->cpidx + ctx->argc] = NULL;
629 return ctx->cpidx + ctx->argc;
630}
631
632int parse_options_subcommand(int argc, const char **argv, const struct option *options,
633 const char *const subcommands[], const char *usagestr[], int flags)
634{
635 struct parse_opt_ctx_t ctx;
636
637 /* build usage string if it's not provided */
638 if (subcommands && !usagestr[0]) {
639 char *buf = NULL;
640
641 astrcatf(&buf, "%s %s [<options>] {", subcmd_config.exec_name, argv[0]);
642
643 for (int i = 0; subcommands[i]; i++) {
644 if (i)
645 astrcat(&buf, "|");
646 astrcat(&buf, subcommands[i]);
647 }
648 astrcat(&buf, "}");
649
650 usagestr[0] = buf;
651 }
652
653 parse_options_start(&ctx, argc, argv, flags);
654 switch (parse_options_step(&ctx, options, usagestr)) {
655 case PARSE_OPT_HELP:
656 exit(129);
657 case PARSE_OPT_DONE:
658 break;
659 case PARSE_OPT_LIST_OPTS:
660 while (options->type != OPTION_END) {
661 if (options->long_name)
662 printf("--%s ", options->long_name);
663 options++;
664 }
665 putchar('\n');
666 exit(130);
667 case PARSE_OPT_LIST_SUBCMDS:
668 if (subcommands) {
669 for (int i = 0; subcommands[i]; i++)
670 printf("%s ", subcommands[i]);
671 }
672 putchar('\n');
673 exit(130);
674 default: /* PARSE_OPT_UNKNOWN */
675 if (ctx.argv[0][1] == '-')
676 astrcatf(&error_buf, "unknown option `%s'",
677 ctx.argv[0] + 2);
678 else
679 astrcatf(&error_buf, "unknown switch `%c'", *ctx.opt);
680 usage_with_options(usagestr, options);
681 }
682
683 return parse_options_end(&ctx);
684}
685
686int parse_options(int argc, const char **argv, const struct option *options,
687 const char * const usagestr[], int flags)
688{
689 return parse_options_subcommand(argc, argv, options, NULL,
690 (const char **) usagestr, flags);
691}
692
693#define USAGE_OPTS_WIDTH 24
694#define USAGE_GAP 2
695
696static void print_option_help(const struct option *opts, int full)
697{
698 size_t pos;
699 int pad;
700
701 if (opts->type == OPTION_GROUP) {
702 fputc('\n', stderr);
703 if (*opts->help)
704 fprintf(stderr, "%s\n", opts->help);
705 return;
706 }
707 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
708 return;
709 if (opts->flags & PARSE_OPT_DISABLED)
710 return;
711
712 pos = fprintf(stderr, " ");
713 if (opts->short_name)
714 pos += fprintf(stderr, "-%c", opts->short_name);
715 else
716 pos += fprintf(stderr, " ");
717
718 if (opts->long_name && opts->short_name)
719 pos += fprintf(stderr, ", ");
720 if (opts->long_name)
721 pos += fprintf(stderr, "--%s", opts->long_name);
722
723 switch (opts->type) {
724 case OPTION_ARGUMENT:
725 break;
726 case OPTION_LONG:
727 case OPTION_ULONG:
728 case OPTION_U64:
729 case OPTION_INTEGER:
730 case OPTION_UINTEGER:
731 if (opts->flags & PARSE_OPT_OPTARG)
732 if (opts->long_name)
733 pos += fprintf(stderr, "[=<n>]");
734 else
735 pos += fprintf(stderr, "[<n>]");
736 else
737 pos += fprintf(stderr, " <n>");
738 break;
739 case OPTION_CALLBACK:
740 if (opts->flags & PARSE_OPT_NOARG)
741 break;
742 /* FALLTHROUGH */
743 case OPTION_STRING:
744 if (opts->argh) {
745 if (opts->flags & PARSE_OPT_OPTARG)
746 if (opts->long_name)
747 pos += fprintf(stderr, "[=<%s>]", opts->argh);
748 else
749 pos += fprintf(stderr, "[<%s>]", opts->argh);
750 else
751 pos += fprintf(stderr, " <%s>", opts->argh);
752 } else {
753 if (opts->flags & PARSE_OPT_OPTARG)
754 if (opts->long_name)
755 pos += fprintf(stderr, "[=...]");
756 else
757 pos += fprintf(stderr, "[...]");
758 else
759 pos += fprintf(stderr, " ...");
760 }
761 break;
762 default: /* OPTION_{BIT,BOOLEAN,SET_UINT,SET_PTR} */
763 case OPTION_END:
764 case OPTION_GROUP:
765 case OPTION_BIT:
766 case OPTION_BOOLEAN:
767 case OPTION_INCR:
768 case OPTION_SET_UINT:
769 case OPTION_SET_PTR:
770 break;
771 }
772
773 if (pos <= USAGE_OPTS_WIDTH)
774 pad = USAGE_OPTS_WIDTH - pos;
775 else {
776 fputc('\n', stderr);
777 pad = USAGE_OPTS_WIDTH;
778 }
779 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
780 if (opts->flags & PARSE_OPT_NOBUILD)
781 fprintf(stderr, "%*s(not built-in because %s)\n",
782 USAGE_OPTS_WIDTH + USAGE_GAP, "",
783 opts->build_opt);
784}
785
786static int option__cmp(const void *va, const void *vb)
787{
788 const struct option *a = va, *b = vb;
789 int sa = tolower(a->short_name), sb = tolower(b->short_name), ret;
790
791 if (sa == 0)
792 sa = 'z' + 1;
793 if (sb == 0)
794 sb = 'z' + 1;
795
796 ret = sa - sb;
797
798 if (ret == 0) {
799 const char *la = a->long_name ?: "",
800 *lb = b->long_name ?: "";
801 ret = strcmp(la, lb);
802 }
803
804 return ret;
805}
806
807static struct option *options__order(const struct option *opts)
808{
809 int nr_opts = 0, nr_group = 0, nr_parent = 0, len;
810 const struct option *o = NULL, *p = opts;
811 struct option *opt, *ordered = NULL, *group;
812
813 /* flatten the options that have parents */
814 for (p = opts; p != NULL; p = o->parent) {
815 for (o = p; o->type != OPTION_END; o++)
816 ++nr_opts;
817
818 /*
819 * the length is given by the number of options plus a null
820 * terminator for the last loop iteration.
821 */
822 len = sizeof(*o) * (nr_opts + !o->parent);
823 group = realloc(ordered, len);
824 if (!group)
825 goto out;
826 ordered = group;
827 memcpy(&ordered[nr_parent], p, sizeof(*o) * (nr_opts - nr_parent));
828
829 nr_parent = nr_opts;
830 }
831 /* copy the last OPTION_END */
832 memcpy(&ordered[nr_opts], o, sizeof(*o));
833
834 /* sort each option group individually */
835 for (opt = group = ordered; opt->type != OPTION_END; opt++) {
836 if (opt->type == OPTION_GROUP) {
837 qsort(group, nr_group, sizeof(*opt), option__cmp);
838 group = opt + 1;
839 nr_group = 0;
840 continue;
841 }
842 nr_group++;
843 }
844 qsort(group, nr_group, sizeof(*opt), option__cmp);
845
846out:
847 return ordered;
848}
849
850static bool option__in_argv(const struct option *opt, const struct parse_opt_ctx_t *ctx)
851{
852 int i;
853
854 for (i = 1; i < ctx->argc; ++i) {
855 const char *arg = ctx->argv[i];
856
857 if (arg[0] != '-') {
858 if (arg[1] == '\0') {
859 if (arg[0] == opt->short_name)
860 return true;
861 continue;
862 }
863
864 if (opt->long_name && strcmp(opt->long_name, arg) == 0)
865 return true;
866
867 if (opt->help && strcasestr(opt->help, arg) != NULL)
868 return true;
869
870 continue;
871 }
872
873 if (arg[1] == opt->short_name ||
874 (arg[1] == '-' && opt->long_name && strcmp(opt->long_name, arg + 2) == 0))
875 return true;
876 }
877
878 return false;
879}
880
881static int usage_with_options_internal(const char * const *usagestr,
882 const struct option *opts, int full,
883 struct parse_opt_ctx_t *ctx)
884{
885 struct option *ordered;
886
887 if (!usagestr)
888 return PARSE_OPT_HELP;
889
890 setup_pager();
891
892 if (error_buf) {
893 fprintf(stderr, " Error: %s\n", error_buf);
894 zfree(&error_buf);
895 }
896
897 fprintf(stderr, "\n Usage: %s\n", *usagestr++);
898 while (*usagestr && **usagestr)
899 fprintf(stderr, " or: %s\n", *usagestr++);
900 while (*usagestr) {
901 fprintf(stderr, "%s%s\n",
902 **usagestr ? " " : "",
903 *usagestr);
904 usagestr++;
905 }
906
907 if (opts->type != OPTION_GROUP)
908 fputc('\n', stderr);
909
910 ordered = options__order(opts);
911 if (ordered)
912 opts = ordered;
913
914 for ( ; opts->type != OPTION_END; opts++) {
915 if (ctx && ctx->argc > 1 && !option__in_argv(opts, ctx))
916 continue;
917 print_option_help(opts, full);
918 }
919
920 fputc('\n', stderr);
921
922 free(ordered);
923
924 return PARSE_OPT_HELP;
925}
926
927void usage_with_options(const char * const *usagestr,
928 const struct option *opts)
929{
930 usage_with_options_internal(usagestr, opts, 0, NULL);
931 exit(129);
932}
933
934void usage_with_options_msg(const char * const *usagestr,
935 const struct option *opts, const char *fmt, ...)
936{
937 va_list ap;
938 char *tmp = error_buf;
939
940 va_start(ap, fmt);
941 if (vasprintf(&error_buf, fmt, ap) == -1)
942 die("vasprintf failed");
943 va_end(ap);
944
945 free(tmp);
946
947 usage_with_options_internal(usagestr, opts, 0, NULL);
948 exit(129);
949}
950
951int parse_options_usage(const char * const *usagestr,
952 const struct option *opts,
953 const char *optstr, bool short_opt)
954{
955 if (!usagestr)
956 goto opt;
957
958 fprintf(stderr, "\n Usage: %s\n", *usagestr++);
959 while (*usagestr && **usagestr)
960 fprintf(stderr, " or: %s\n", *usagestr++);
961 while (*usagestr) {
962 fprintf(stderr, "%s%s\n",
963 **usagestr ? " " : "",
964 *usagestr);
965 usagestr++;
966 }
967 fputc('\n', stderr);
968
969opt:
970 for ( ; opts->type != OPTION_END; opts++) {
971 if (short_opt) {
972 if (opts->short_name == *optstr) {
973 print_option_help(opts, 0);
974 break;
975 }
976 continue;
977 }
978
979 if (opts->long_name == NULL)
980 continue;
981
982 if (strstarts(opts->long_name, optstr))
983 print_option_help(opts, 0);
984 if (strstarts("no-", optstr) &&
985 strstarts(opts->long_name, optstr + 3))
986 print_option_help(opts, 0);
987 }
988
989 return PARSE_OPT_HELP;
990}
991
992
993int parse_opt_verbosity_cb(const struct option *opt,
994 const char *arg __maybe_unused,
995 int unset)
996{
997 int *target = opt->value;
998
999 if (unset)
1000 /* --no-quiet, --no-verbose */
1001 *target = 0;
1002 else if (opt->short_name == 'v') {
1003 if (*target >= 0)
1004 (*target)++;
1005 else
1006 *target = 1;
1007 } else {
1008 if (*target <= 0)
1009 (*target)--;
1010 else
1011 *target = -1;
1012 }
1013 return 0;
1014}
1015
1016static struct option *
1017find_option(struct option *opts, int shortopt, const char *longopt)
1018{
1019 for (; opts->type != OPTION_END; opts++) {
1020 if ((shortopt && opts->short_name == shortopt) ||
1021 (opts->long_name && longopt &&
1022 !strcmp(opts->long_name, longopt)))
1023 return opts;
1024 }
1025 return NULL;
1026}
1027
1028void set_option_flag(struct option *opts, int shortopt, const char *longopt,
1029 int flag)
1030{
1031 struct option *opt = find_option(opts, shortopt, longopt);
1032
1033 if (opt)
1034 opt->flags |= flag;
1035 return;
1036}
1037
1038void set_option_nobuild(struct option *opts, int shortopt,
1039 const char *longopt,
1040 const char *build_opt,
1041 bool can_skip)
1042{
1043 struct option *opt = find_option(opts, shortopt, longopt);
1044
1045 if (!opt)
1046 return;
1047
1048 opt->flags |= PARSE_OPT_NOBUILD;
1049 opt->flags |= can_skip ? PARSE_OPT_CANSKIP : 0;
1050 opt->build_opt = build_opt;
1051}