1 #include <linux/compiler.h>
2 #include <linux/types.h>
8 #include "subcmd-util.h"
9 #include "parse-options.h"
10 #include "subcmd-config.h"
18 static int opterror(const struct option *opt, const char *reason, int flags)
20 if (flags & OPT_SHORT)
21 fprintf(stderr, " Error: switch `%c' %s", opt->short_name, reason);
22 else if (flags & OPT_UNSET)
23 fprintf(stderr, " Error: option `no-%s' %s", opt->long_name, reason);
25 fprintf(stderr, " Error: option `%s' %s", opt->long_name, reason);
30 static const char *skip_prefix(const char *str, const char *prefix)
32 size_t len = strlen(prefix);
33 return strncmp(str, prefix, len) ? NULL : str + len;
36 static void optwarning(const struct option *opt, const char *reason, int flags)
38 if (flags & OPT_SHORT)
39 fprintf(stderr, " Warning: switch `%c' %s", opt->short_name, reason);
40 else if (flags & OPT_UNSET)
41 fprintf(stderr, " Warning: option `no-%s' %s", opt->long_name, reason);
43 fprintf(stderr, " Warning: option `%s' %s", opt->long_name, reason);
46 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
47 int flags, const char **arg)
54 } else if ((opt->flags & PARSE_OPT_LASTARG_DEFAULT) && (p->argc == 1 ||
55 **(p->argv + 1) == '-')) {
56 res = (const char *)opt->defval;
57 } else if (p->argc > 1) {
61 return opterror(opt, "requires a value", flags);
67 static int get_value(struct parse_opt_ctx_t *p,
68 const struct option *opt, int flags)
70 const char *s, *arg = NULL;
71 const int unset = flags & OPT_UNSET;
75 return opterror(opt, "takes no value", flags);
76 if (unset && (opt->flags & PARSE_OPT_NONEG))
77 return opterror(opt, "isn't available", flags);
78 if (opt->flags & PARSE_OPT_DISABLED)
79 return opterror(opt, "is not usable", flags);
81 if (opt->flags & PARSE_OPT_EXCLUSIVE) {
82 if (p->excl_opt && p->excl_opt != opt) {
85 if (((flags & OPT_SHORT) && p->excl_opt->short_name) ||
86 p->excl_opt->long_name == NULL) {
87 snprintf(msg, sizeof(msg), "cannot be used with switch `%c'",
88 p->excl_opt->short_name);
90 snprintf(msg, sizeof(msg), "cannot be used with %s",
91 p->excl_opt->long_name);
93 opterror(opt, msg, flags);
98 if (!(flags & OPT_SHORT) && p->opt) {
100 case OPTION_CALLBACK:
101 if (!(opt->flags & PARSE_OPT_NOARG))
107 case OPTION_SET_UINT:
109 return opterror(opt, "takes no value", flags);
111 case OPTION_ARGUMENT:
115 case OPTION_UINTEGER:
123 if (opt->flags & PARSE_OPT_NOBUILD) {
127 err = snprintf(reason, sizeof(reason),
128 opt->flags & PARSE_OPT_CANSKIP ?
129 "is being ignored because %s " :
130 "is not available because %s",
132 reason[sizeof(reason) - 1] = '\0';
135 strncpy(reason, opt->flags & PARSE_OPT_CANSKIP ?
140 if (!(opt->flags & PARSE_OPT_CANSKIP))
141 return opterror(opt, reason, flags);
146 if (opt->flags & PARSE_OPT_NOARG)
148 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
155 case OPTION_SET_UINT:
158 case OPTION_ARGUMENT:
162 case OPTION_CALLBACK:
165 case OPTION_UINTEGER:
173 err = get_arg(p, opt, flags, NULL);
177 optwarning(opt, reason, flags);
184 *(int *)opt->value &= ~opt->defval;
186 *(int *)opt->value |= opt->defval;
190 *(bool *)opt->value = unset ? false : true;
192 *(bool *)opt->set = true;
196 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
199 case OPTION_SET_UINT:
200 *(unsigned int *)opt->value = unset ? 0 : opt->defval;
204 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
210 *(const char **)opt->value = NULL;
211 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
212 *(const char **)opt->value = (const char *)opt->defval;
214 err = get_arg(p, opt, flags, (const char **)opt->value);
216 /* PARSE_OPT_NOEMPTY: Allow NULL but disallow empty string. */
217 if (opt->flags & PARSE_OPT_NOEMPTY) {
218 const char *val = *(const char **)opt->value;
223 /* Similar to unset if we are given an empty string. */
224 if (val[0] == '\0') {
225 *(const char **)opt->value = NULL;
232 case OPTION_CALLBACK:
234 return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
235 if (opt->flags & PARSE_OPT_NOARG)
236 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
237 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
238 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
239 if (get_arg(p, opt, flags, &arg))
241 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
245 *(int *)opt->value = 0;
248 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
249 *(int *)opt->value = opt->defval;
252 if (get_arg(p, opt, flags, &arg))
254 *(int *)opt->value = strtol(arg, (char **)&s, 10);
256 return opterror(opt, "expects a numerical value", flags);
259 case OPTION_UINTEGER:
261 *(unsigned int *)opt->value = 0;
264 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
265 *(unsigned int *)opt->value = opt->defval;
268 if (get_arg(p, opt, flags, &arg))
270 *(unsigned int *)opt->value = strtol(arg, (char **)&s, 10);
272 return opterror(opt, "expects a numerical value", flags);
277 *(long *)opt->value = 0;
280 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
281 *(long *)opt->value = opt->defval;
284 if (get_arg(p, opt, flags, &arg))
286 *(long *)opt->value = strtol(arg, (char **)&s, 10);
288 return opterror(opt, "expects a numerical value", flags);
293 *(u64 *)opt->value = 0;
296 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
297 *(u64 *)opt->value = opt->defval;
300 if (get_arg(p, opt, flags, &arg))
302 *(u64 *)opt->value = strtoull(arg, (char **)&s, 10);
304 return opterror(opt, "expects a numerical value", flags);
308 case OPTION_ARGUMENT:
311 die("should not happen, someone must be hit on the forehead");
315 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
318 for (; options->type != OPTION_END; options++) {
319 if (options->short_name == *p->opt) {
320 p->opt = p->opt[1] ? p->opt + 1 : NULL;
321 return get_value(p, options, OPT_SHORT);
325 if (options->parent) {
326 options = options->parent;
333 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
334 const struct option *options)
336 const char *arg_end = strchr(arg, '=');
337 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
338 int abbrev_flags = 0, ambiguous_flags = 0;
341 arg_end = arg + strlen(arg);
344 for (; options->type != OPTION_END; options++) {
348 if (!options->long_name)
351 rest = skip_prefix(arg, options->long_name);
352 if (options->type == OPTION_ARGUMENT) {
356 return opterror(options, "takes no value", flags);
359 p->out[p->cpidx++] = arg - 2;
363 if (!prefixcmp(options->long_name, "no-")) {
365 * The long name itself starts with "no-", so
366 * accept the option without "no-" so that users
367 * do not have to enter "no-no-" to get the
370 rest = skip_prefix(arg, options->long_name + 3);
375 /* Abbreviated case */
376 if (!prefixcmp(options->long_name + 3, arg)) {
382 if (!strncmp(options->long_name, arg, arg_end - arg)) {
386 * If this is abbreviated, it is
387 * ambiguous. So when there is no
388 * exact match later, we need to
391 ambiguous_option = abbrev_option;
392 ambiguous_flags = abbrev_flags;
394 if (!(flags & OPT_UNSET) && *arg_end)
395 p->opt = arg_end + 1;
396 abbrev_option = options;
397 abbrev_flags = flags;
400 /* negated and abbreviated very much? */
401 if (!prefixcmp("no-", arg)) {
406 if (strncmp(arg, "no-", 3))
409 rest = skip_prefix(arg + 3, options->long_name);
410 /* abbreviated and negated? */
411 if (!rest && !prefixcmp(options->long_name, arg + 3))
422 return get_value(p, options, flags);
425 if (ambiguous_option) {
427 " Error: Ambiguous option: %s (could be --%s%s or --%s%s)",
429 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
430 ambiguous_option->long_name,
431 (abbrev_flags & OPT_UNSET) ? "no-" : "",
432 abbrev_option->long_name);
436 return get_value(p, abbrev_option, abbrev_flags);
438 if (options->parent) {
439 options = options->parent;
446 static void check_typos(const char *arg, const struct option *options)
451 if (!prefixcmp(arg, "no-")) {
452 fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)", arg);
456 for (; options->type != OPTION_END; options++) {
457 if (!options->long_name)
459 if (!prefixcmp(options->long_name, arg)) {
460 fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)", arg);
466 static void parse_options_start(struct parse_opt_ctx_t *ctx,
467 int argc, const char **argv, int flags)
469 memset(ctx, 0, sizeof(*ctx));
470 ctx->argc = argc - 1;
471 ctx->argv = argv + 1;
473 ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
475 if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
476 (flags & PARSE_OPT_STOP_AT_NON_OPTION))
477 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
480 static int usage_with_options_internal(const char * const *,
481 const struct option *, int,
482 struct parse_opt_ctx_t *);
484 static int parse_options_step(struct parse_opt_ctx_t *ctx,
485 const struct option *options,
486 const char * const usagestr[])
488 int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
489 int excl_short_opt = 1;
492 /* we must reset ->opt, unknown short option leave it dangling */
495 for (; ctx->argc; ctx->argc--, ctx->argv++) {
497 if (*arg != '-' || !arg[1]) {
498 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
500 ctx->out[ctx->cpidx++] = ctx->argv[0];
506 if (internal_help && *ctx->opt == 'h') {
507 return usage_with_options_internal(usagestr, options, 0, ctx);
509 switch (parse_short_opt(ctx, options)) {
511 return parse_options_usage(usagestr, options, arg, 1);
520 check_typos(arg, options);
522 if (internal_help && *ctx->opt == 'h')
523 return usage_with_options_internal(usagestr, options, 0, ctx);
525 switch (parse_short_opt(ctx, options)) {
527 return parse_options_usage(usagestr, options, arg, 1);
529 /* fake a short option thing to hide the fact that we may have
530 * started to parse aggregated stuff
532 * This is leaky, too bad.
534 ctx->argv[0] = strdup(ctx->opt - 1);
535 *(char *)ctx->argv[0] = '-';
546 if (!arg[2]) { /* "--" */
547 if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
555 if (internal_help && !strcmp(arg, "help-all"))
556 return usage_with_options_internal(usagestr, options, 1, ctx);
557 if (internal_help && !strcmp(arg, "help"))
558 return usage_with_options_internal(usagestr, options, 0, ctx);
559 if (!strcmp(arg, "list-opts"))
560 return PARSE_OPT_LIST_OPTS;
561 if (!strcmp(arg, "list-cmds"))
562 return PARSE_OPT_LIST_SUBCMDS;
563 switch (parse_long_opt(ctx, arg, options)) {
565 return parse_options_usage(usagestr, options, arg, 0);
576 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
577 return PARSE_OPT_UNKNOWN;
578 ctx->out[ctx->cpidx++] = ctx->argv[0];
581 return PARSE_OPT_DONE;
584 parse_options_usage(usagestr, options, arg, excl_short_opt);
585 if ((excl_short_opt && ctx->excl_opt->short_name) ||
586 ctx->excl_opt->long_name == NULL) {
587 char opt = ctx->excl_opt->short_name;
588 parse_options_usage(NULL, options, &opt, 1);
590 parse_options_usage(NULL, options, ctx->excl_opt->long_name, 0);
592 return PARSE_OPT_HELP;
595 static int parse_options_end(struct parse_opt_ctx_t *ctx)
597 memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
598 ctx->out[ctx->cpidx + ctx->argc] = NULL;
599 return ctx->cpidx + ctx->argc;
602 int parse_options_subcommand(int argc, const char **argv, const struct option *options,
603 const char *const subcommands[], const char *usagestr[], int flags)
605 struct parse_opt_ctx_t ctx;
607 /* build usage string if it's not provided */
608 if (subcommands && !usagestr[0]) {
611 astrcatf(&buf, "%s %s [<options>] {", subcmd_config.exec_name, argv[0]);
613 for (int i = 0; subcommands[i]; i++) {
616 astrcat(&buf, subcommands[i]);
623 parse_options_start(&ctx, argc, argv, flags);
624 switch (parse_options_step(&ctx, options, usagestr)) {
629 case PARSE_OPT_LIST_OPTS:
630 while (options->type != OPTION_END) {
631 if (options->long_name)
632 printf("--%s ", options->long_name);
637 case PARSE_OPT_LIST_SUBCMDS:
639 for (int i = 0; subcommands[i]; i++)
640 printf("%s ", subcommands[i]);
644 default: /* PARSE_OPT_UNKNOWN */
645 if (ctx.argv[0][1] == '-')
646 astrcatf(&error_buf, "unknown option `%s'",
649 astrcatf(&error_buf, "unknown switch `%c'", *ctx.opt);
650 usage_with_options(usagestr, options);
653 return parse_options_end(&ctx);
656 int parse_options(int argc, const char **argv, const struct option *options,
657 const char * const usagestr[], int flags)
659 return parse_options_subcommand(argc, argv, options, NULL,
660 (const char **) usagestr, flags);
663 #define USAGE_OPTS_WIDTH 24
666 static void print_option_help(const struct option *opts, int full)
671 if (opts->type == OPTION_GROUP) {
674 fprintf(stderr, "%s\n", opts->help);
677 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
679 if (opts->flags & PARSE_OPT_DISABLED)
682 pos = fprintf(stderr, " ");
683 if (opts->short_name)
684 pos += fprintf(stderr, "-%c", opts->short_name);
686 pos += fprintf(stderr, " ");
688 if (opts->long_name && opts->short_name)
689 pos += fprintf(stderr, ", ");
691 pos += fprintf(stderr, "--%s", opts->long_name);
693 switch (opts->type) {
694 case OPTION_ARGUMENT:
699 case OPTION_UINTEGER:
700 if (opts->flags & PARSE_OPT_OPTARG)
702 pos += fprintf(stderr, "[=<n>]");
704 pos += fprintf(stderr, "[<n>]");
706 pos += fprintf(stderr, " <n>");
708 case OPTION_CALLBACK:
709 if (opts->flags & PARSE_OPT_NOARG)
714 if (opts->flags & PARSE_OPT_OPTARG)
716 pos += fprintf(stderr, "[=<%s>]", opts->argh);
718 pos += fprintf(stderr, "[<%s>]", opts->argh);
720 pos += fprintf(stderr, " <%s>", opts->argh);
722 if (opts->flags & PARSE_OPT_OPTARG)
724 pos += fprintf(stderr, "[=...]");
726 pos += fprintf(stderr, "[...]");
728 pos += fprintf(stderr, " ...");
731 default: /* OPTION_{BIT,BOOLEAN,SET_UINT,SET_PTR} */
737 case OPTION_SET_UINT:
742 if (pos <= USAGE_OPTS_WIDTH)
743 pad = USAGE_OPTS_WIDTH - pos;
746 pad = USAGE_OPTS_WIDTH;
748 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
749 if (opts->flags & PARSE_OPT_NOBUILD)
750 fprintf(stderr, "%*s(not built-in because %s)\n",
751 USAGE_OPTS_WIDTH + USAGE_GAP, "",
755 static int option__cmp(const void *va, const void *vb)
757 const struct option *a = va, *b = vb;
758 int sa = tolower(a->short_name), sb = tolower(b->short_name), ret;
768 const char *la = a->long_name ?: "",
769 *lb = b->long_name ?: "";
770 ret = strcmp(la, lb);
776 static struct option *options__order(const struct option *opts)
778 int nr_opts = 0, len;
779 const struct option *o = opts;
780 struct option *ordered;
782 for (o = opts; o->type != OPTION_END; o++)
785 len = sizeof(*o) * (nr_opts + 1);
786 ordered = malloc(len);
789 memcpy(ordered, opts, len);
791 qsort(ordered, nr_opts, sizeof(*o), option__cmp);
796 static bool option__in_argv(const struct option *opt, const struct parse_opt_ctx_t *ctx)
800 for (i = 1; i < ctx->argc; ++i) {
801 const char *arg = ctx->argv[i];
804 if (arg[1] == '\0') {
805 if (arg[0] == opt->short_name)
810 if (opt->long_name && strcmp(opt->long_name, arg) == 0)
813 if (opt->help && strcasestr(opt->help, arg) != NULL)
819 if (arg[1] == opt->short_name ||
820 (arg[1] == '-' && opt->long_name && strcmp(opt->long_name, arg + 2) == 0))
827 static int usage_with_options_internal(const char * const *usagestr,
828 const struct option *opts, int full,
829 struct parse_opt_ctx_t *ctx)
831 struct option *ordered;
834 return PARSE_OPT_HELP;
839 fprintf(stderr, " Error: %s\n", error_buf);
843 fprintf(stderr, "\n Usage: %s\n", *usagestr++);
844 while (*usagestr && **usagestr)
845 fprintf(stderr, " or: %s\n", *usagestr++);
847 fprintf(stderr, "%s%s\n",
848 **usagestr ? " " : "",
853 if (opts->type != OPTION_GROUP)
856 ordered = options__order(opts);
860 for ( ; opts->type != OPTION_END; opts++) {
861 if (ctx && ctx->argc > 1 && !option__in_argv(opts, ctx))
863 print_option_help(opts, full);
870 return PARSE_OPT_HELP;
873 void usage_with_options(const char * const *usagestr,
874 const struct option *opts)
876 usage_with_options_internal(usagestr, opts, 0, NULL);
880 void usage_with_options_msg(const char * const *usagestr,
881 const struct option *opts, const char *fmt, ...)
884 char *tmp = error_buf;
887 if (vasprintf(&error_buf, fmt, ap) == -1)
888 die("vasprintf failed");
893 usage_with_options_internal(usagestr, opts, 0, NULL);
897 int parse_options_usage(const char * const *usagestr,
898 const struct option *opts,
899 const char *optstr, bool short_opt)
904 fprintf(stderr, "\n Usage: %s\n", *usagestr++);
905 while (*usagestr && **usagestr)
906 fprintf(stderr, " or: %s\n", *usagestr++);
908 fprintf(stderr, "%s%s\n",
909 **usagestr ? " " : "",
916 for ( ; opts->type != OPTION_END; opts++) {
918 if (opts->short_name == *optstr) {
919 print_option_help(opts, 0);
925 if (opts->long_name == NULL)
928 if (!prefixcmp(opts->long_name, optstr))
929 print_option_help(opts, 0);
930 if (!prefixcmp("no-", optstr) &&
931 !prefixcmp(opts->long_name, optstr + 3))
932 print_option_help(opts, 0);
935 return PARSE_OPT_HELP;
939 int parse_opt_verbosity_cb(const struct option *opt,
940 const char *arg __maybe_unused,
943 int *target = opt->value;
946 /* --no-quiet, --no-verbose */
948 else if (opt->short_name == 'v') {
962 static struct option *
963 find_option(struct option *opts, int shortopt, const char *longopt)
965 for (; opts->type != OPTION_END; opts++) {
966 if ((shortopt && opts->short_name == shortopt) ||
967 (opts->long_name && longopt &&
968 !strcmp(opts->long_name, longopt)))
974 void set_option_flag(struct option *opts, int shortopt, const char *longopt,
977 struct option *opt = find_option(opts, shortopt, longopt);
984 void set_option_nobuild(struct option *opts, int shortopt,
986 const char *build_opt,
989 struct option *opt = find_option(opts, shortopt, longopt);
994 opt->flags |= PARSE_OPT_NOBUILD;
995 opt->flags |= can_skip ? PARSE_OPT_CANSKIP : 0;
996 opt->build_opt = build_opt;