tools/perf/util/parse-options.c

   1 #include "util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4 #include "header.h"
   5 #include <linux/string.h>
   6
   7 #define OPT_SHORT 1
   8 #define OPT_UNSET 2
   9
  10 static int opterror(const struct option *opt, const char *reason, int flags)
  11 {
  12         if (flags & OPT_SHORT)
  13                 return error("switch `%c' %s", opt->short_name, reason);
  14         if (flags & OPT_UNSET)
  15                 return error("option `no-%s' %s", opt->long_name, reason);
  16         return error("option `%s' %s", opt->long_name, reason);
  17 }
  18
  19 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  20                    int flags, const char **arg)
  21 {
  22         if (p->opt) {
  23                 *arg = p->opt;
  24                 p->opt = NULL;
  25         } else if ((opt->flags & PARSE_OPT_LASTARG_DEFAULT) && (p->argc == 1 ||
  26                     **(p->argv + 1) == '-')) {
  27                 *arg = (const char *)opt->defval;
  28         } else if (p->argc > 1) {
  29                 p->argc--;
  30                 *arg = *++p->argv;
  31         } else
  32                 return opterror(opt, "requires a value", flags);
  33         return 0;
  34 }
  35
  36 static int get_value(struct parse_opt_ctx_t *p,
  37                      const struct option *opt, int flags)
  38 {
  39         const char *s, *arg = NULL;
  40         const int unset = flags & OPT_UNSET;
  41         int err;
  42
  43         if (unset && p->opt)
  44                 return opterror(opt, "takes no value", flags);
  45         if (unset && (opt->flags & PARSE_OPT_NONEG))
  46                 return opterror(opt, "isn't available", flags);
  47         if (opt->flags & PARSE_OPT_DISABLED)
  48                 return opterror(opt, "is not usable", flags);
  49
  50         if (opt->flags & PARSE_OPT_EXCLUSIVE) {
  51                 if (p->excl_opt && p->excl_opt != opt) {
  52                         char msg[128];
  53
  54                         if (((flags & OPT_SHORT) && p->excl_opt->short_name) ||
  55                             p->excl_opt->long_name == NULL) {
  56                                 scnprintf(msg, sizeof(msg), "cannot be used with switch `%c'",
  57                                           p->excl_opt->short_name);
  58                         } else {
  59                                 scnprintf(msg, sizeof(msg), "cannot be used with %s",
  60                                           p->excl_opt->long_name);
  61                         }
  62                         opterror(opt, msg, flags);
  63                         return -3;
  64                 }
  65                 p->excl_opt = opt;
  66         }
  67         if (!(flags & OPT_SHORT) && p->opt) {
  68                 switch (opt->type) {
  69                 case OPTION_CALLBACK:
  70                         if (!(opt->flags & PARSE_OPT_NOARG))
  71                                 break;
  72                         /* FALLTHROUGH */
  73                 case OPTION_BOOLEAN:
  74                 case OPTION_INCR:
  75                 case OPTION_BIT:
  76                 case OPTION_SET_UINT:
  77                 case OPTION_SET_PTR:
  78                         return opterror(opt, "takes no value", flags);
  79                 case OPTION_END:
  80                 case OPTION_ARGUMENT:
  81                 case OPTION_GROUP:
  82                 case OPTION_STRING:
  83                 case OPTION_INTEGER:
  84                 case OPTION_UINTEGER:
  85                 case OPTION_LONG:
  86                 case OPTION_U64:
  87                 default:
  88                         break;
  89                 }
  90         }
  91
  92         switch (opt->type) {
  93         case OPTION_BIT:
  94                 if (unset)
  95                         *(int *)opt->value &= ~opt->defval;
  96                 else
  97                         *(int *)opt->value |= opt->defval;
  98                 return 0;
  99
 100         case OPTION_BOOLEAN:
 101                 *(bool *)opt->value = unset ? false : true;
 102                 if (opt->set)
 103                         *(bool *)opt->set = true;
 104                 return 0;
 105
 106         case OPTION_INCR:
 107                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 108                 return 0;
 109
 110         case OPTION_SET_UINT:
 111                 *(unsigned int *)opt->value = unset ? 0 : opt->defval;
 112                 return 0;
 113
 114         case OPTION_SET_PTR:
 115                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
 116                 return 0;
 117
 118         case OPTION_STRING:
 119                 err = 0;
 120                 if (unset)
 121                         *(const char **)opt->value = NULL;
 122                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 123                         *(const char **)opt->value = (const char *)opt->defval;
 124                 else
 125                         err = get_arg(p, opt, flags, (const char **)opt->value);
 126
 127                 /* PARSE_OPT_NOEMPTY: Allow NULL but disallow empty string. */
 128                 if (opt->flags & PARSE_OPT_NOEMPTY) {
 129                         const char *val = *(const char **)opt->value;
 130
 131                         if (!val)
 132                                 return err;
 133
 134                         /* Similar to unset if we are given an empty string. */
 135                         if (val[0] == '\0') {
 136                                 *(const char **)opt->value = NULL;
 137                                 return 0;
 138                         }
 139                 }
 140
 141                 return err;
 142
 143         case OPTION_CALLBACK:
 144                 if (unset)
 145                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 146                 if (opt->flags & PARSE_OPT_NOARG)
 147                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 148                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 149                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 150                 if (get_arg(p, opt, flags, &arg))
 151                         return -1;
 152                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 153
 154         case OPTION_INTEGER:
 155                 if (unset) {
 156                         *(int *)opt->value = 0;
 157                         return 0;
 158                 }
 159                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 160                         *(int *)opt->value = opt->defval;
 161                         return 0;
 162                 }
 163                 if (get_arg(p, opt, flags, &arg))
 164                         return -1;
 165                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 166                 if (*s)
 167                         return opterror(opt, "expects a numerical value", flags);
 168                 return 0;
 169
 170         case OPTION_UINTEGER:
 171                 if (unset) {
 172                         *(unsigned int *)opt->value = 0;
 173                         return 0;
 174                 }
 175                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 176                         *(unsigned int *)opt->value = opt->defval;
 177                         return 0;
 178                 }
 179                 if (get_arg(p, opt, flags, &arg))
 180                         return -1;
 181                 *(unsigned int *)opt->value = strtol(arg, (char **)&s, 10);
 182                 if (*s)
 183                         return opterror(opt, "expects a numerical value", flags);
 184                 return 0;
 185
 186         case OPTION_LONG:
 187                 if (unset) {
 188                         *(long *)opt->value = 0;
 189                         return 0;
 190                 }
 191                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 192                         *(long *)opt->value = opt->defval;
 193                         return 0;
 194                 }
 195                 if (get_arg(p, opt, flags, &arg))
 196                         return -1;
 197                 *(long *)opt->value = strtol(arg, (char **)&s, 10);
 198                 if (*s)
 199                         return opterror(opt, "expects a numerical value", flags);
 200                 return 0;
 201
 202         case OPTION_U64:
 203                 if (unset) {
 204                         *(u64 *)opt->value = 0;
 205                         return 0;
 206                 }
 207                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 208                         *(u64 *)opt->value = opt->defval;
 209                         return 0;
 210                 }
 211                 if (get_arg(p, opt, flags, &arg))
 212                         return -1;
 213                 *(u64 *)opt->value = strtoull(arg, (char **)&s, 10);
 214                 if (*s)
 215                         return opterror(opt, "expects a numerical value", flags);
 216                 return 0;
 217
 218         case OPTION_END:
 219         case OPTION_ARGUMENT:
 220         case OPTION_GROUP:
 221         default:
 222                 die("should not happen, someone must be hit on the forehead");
 223         }
 224 }
 225
 226 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 227 {
 228         for (; options->type != OPTION_END; options++) {
 229                 if (options->short_name == *p->opt) {
 230                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 231                         return get_value(p, options, OPT_SHORT);
 232                 }
 233         }
 234         return -2;
 235 }
 236
 237 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 238                           const struct option *options)
 239 {
 240         const char *arg_end = strchr(arg, '=');
 241         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 242         int abbrev_flags = 0, ambiguous_flags = 0;
 243
 244         if (!arg_end)
 245                 arg_end = arg + strlen(arg);
 246
 247         for (; options->type != OPTION_END; options++) {
 248                 const char *rest;
 249                 int flags = 0;
 250
 251                 if (!options->long_name)
 252                         continue;
 253
 254                 rest = skip_prefix(arg, options->long_name);
 255                 if (options->type == OPTION_ARGUMENT) {
 256                         if (!rest)
 257                                 continue;
 258                         if (*rest == '=')
 259                                 return opterror(options, "takes no value", flags);
 260                         if (*rest)
 261                                 continue;
 262                         p->out[p->cpidx++] = arg - 2;
 263                         return 0;
 264                 }
 265                 if (!rest) {
 266                         if (!prefixcmp(options->long_name, "no-")) {
 267                                 /*
 268                                  * The long name itself starts with "no-", so
 269                                  * accept the option without "no-" so that users
 270                                  * do not have to enter "no-no-" to get the
 271                                  * negation.
 272                                  */
 273                                 rest = skip_prefix(arg, options->long_name + 3);
 274                                 if (rest) {
 275                                         flags |= OPT_UNSET;
 276                                         goto match;
 277                                 }
 278                                 /* Abbreviated case */
 279                                 if (!prefixcmp(options->long_name + 3, arg)) {
 280                                         flags |= OPT_UNSET;
 281                                         goto is_abbreviated;
 282                                 }
 283                         }
 284                         /* abbreviated? */
 285                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
 286 is_abbreviated:
 287                                 if (abbrev_option) {
 288                                         /*
 289                                          * If this is abbreviated, it is
 290                                          * ambiguous. So when there is no
 291                                          * exact match later, we need to
 292                                          * error out.
 293                                          */
 294                                         ambiguous_option = abbrev_option;
 295                                         ambiguous_flags = abbrev_flags;
 296                                 }
 297                                 if (!(flags & OPT_UNSET) && *arg_end)
 298                                         p->opt = arg_end + 1;
 299                                 abbrev_option = options;
 300                                 abbrev_flags = flags;
 301                                 continue;
 302                         }
 303                         /* negated and abbreviated very much? */
 304                         if (!prefixcmp("no-", arg)) {
 305                                 flags |= OPT_UNSET;
 306                                 goto is_abbreviated;
 307                         }
 308                         /* negated? */
 309                         if (strncmp(arg, "no-", 3))
 310                                 continue;
 311                         flags |= OPT_UNSET;
 312                         rest = skip_prefix(arg + 3, options->long_name);
 313                         /* abbreviated and negated? */
 314                         if (!rest && !prefixcmp(options->long_name, arg + 3))
 315                                 goto is_abbreviated;
 316                         if (!rest)
 317                                 continue;
 318                 }
 319 match:
 320                 if (*rest) {
 321                         if (*rest != '=')
 322                                 continue;
 323                         p->opt = rest + 1;
 324                 }
 325                 return get_value(p, options, flags);
 326         }
 327
 328         if (ambiguous_option)
 329                 return error("Ambiguous option: %s "
 330                         "(could be --%s%s or --%s%s)",
 331                         arg,
 332                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 333                         ambiguous_option->long_name,
 334                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 335                         abbrev_option->long_name);
 336         if (abbrev_option)
 337                 return get_value(p, abbrev_option, abbrev_flags);
 338         return -2;
 339 }
 340
 341 static void check_typos(const char *arg, const struct option *options)
 342 {
 343         if (strlen(arg) < 3)
 344                 return;
 345
 346         if (!prefixcmp(arg, "no-")) {
 347                 error ("did you mean `--%s` (with two dashes ?)", arg);
 348                 exit(129);
 349         }
 350
 351         for (; options->type != OPTION_END; options++) {
 352                 if (!options->long_name)
 353                         continue;
 354                 if (!prefixcmp(options->long_name, arg)) {
 355                         error ("did you mean `--%s` (with two dashes ?)", arg);
 356                         exit(129);
 357                 }
 358         }
 359 }
 360
 361 void parse_options_start(struct parse_opt_ctx_t *ctx,
 362                          int argc, const char **argv, int flags)
 363 {
 364         memset(ctx, 0, sizeof(*ctx));
 365         ctx->argc = argc - 1;
 366         ctx->argv = argv + 1;
 367         ctx->out  = argv;
 368         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 369         ctx->flags = flags;
 370         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 371             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 372                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 373 }
 374
 375 static int usage_with_options_internal(const char * const *,
 376                                        const struct option *, int);
 377
 378 int parse_options_step(struct parse_opt_ctx_t *ctx,
 379                        const struct option *options,
 380                        const char * const usagestr[])
 381 {
 382         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 383         int excl_short_opt = 1;
 384         const char *arg;
 385
 386         /* we must reset ->opt, unknown short option leave it dangling */
 387         ctx->opt = NULL;
 388
 389         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 390                 arg = ctx->argv[0];
 391                 if (*arg != '-' || !arg[1]) {
 392                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 393                                 break;
 394                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 395                         continue;
 396                 }
 397
 398                 if (arg[1] != '-') {
 399                         ctx->opt = ++arg;
 400                         if (internal_help && *ctx->opt == 'h')
 401                                 return usage_with_options_internal(usagestr, options, 0);
 402                         switch (parse_short_opt(ctx, options)) {
 403                         case -1:
 404                                 return parse_options_usage(usagestr, options, arg, 1);
 405                         case -2:
 406                                 goto unknown;
 407                         case -3:
 408                                 goto exclusive;
 409                         default:
 410                                 break;
 411                         }
 412                         if (ctx->opt)
 413                                 check_typos(arg, options);
 414                         while (ctx->opt) {
 415                                 if (internal_help && *ctx->opt == 'h')
 416                                         return usage_with_options_internal(usagestr, options, 0);
 417                                 arg = ctx->opt;
 418                                 switch (parse_short_opt(ctx, options)) {
 419                                 case -1:
 420                                         return parse_options_usage(usagestr, options, arg, 1);
 421                                 case -2:
 422                                         /* fake a short option thing to hide the fact that we may have
 423                                          * started to parse aggregated stuff
 424                                          *
 425                                          * This is leaky, too bad.
 426                                          */
 427                                         ctx->argv[0] = strdup(ctx->opt - 1);
 428                                         *(char *)ctx->argv[0] = '-';
 429                                         goto unknown;
 430                                 case -3:
 431                                         goto exclusive;
 432                                 default:
 433                                         break;
 434                                 }
 435                         }
 436                         continue;
 437                 }
 438
 439                 if (!arg[2]) { /* "--" */
 440                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 441                                 ctx->argc--;
 442                                 ctx->argv++;
 443                         }
 444                         break;
 445                 }
 446
 447                 arg += 2;
 448                 if (internal_help && !strcmp(arg, "help-all"))
 449                         return usage_with_options_internal(usagestr, options, 1);
 450                 if (internal_help && !strcmp(arg, "help"))
 451                         return usage_with_options_internal(usagestr, options, 0);
 452                 if (!strcmp(arg, "list-opts"))
 453                         return PARSE_OPT_LIST_OPTS;
 454                 if (!strcmp(arg, "list-cmds"))
 455                         return PARSE_OPT_LIST_SUBCMDS;
 456                 switch (parse_long_opt(ctx, arg, options)) {
 457                 case -1:
 458                         return parse_options_usage(usagestr, options, arg, 0);
 459                 case -2:
 460                         goto unknown;
 461                 case -3:
 462                         excl_short_opt = 0;
 463                         goto exclusive;
 464                 default:
 465                         break;
 466                 }
 467                 continue;
 468 unknown:
 469                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 470                         return PARSE_OPT_UNKNOWN;
 471                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 472                 ctx->opt = NULL;
 473         }
 474         return PARSE_OPT_DONE;
 475
 476 exclusive:
 477         parse_options_usage(usagestr, options, arg, excl_short_opt);
 478         if ((excl_short_opt && ctx->excl_opt->short_name) ||
 479             ctx->excl_opt->long_name == NULL) {
 480                 char opt = ctx->excl_opt->short_name;
 481                 parse_options_usage(NULL, options, &opt, 1);
 482         } else {
 483                 parse_options_usage(NULL, options, ctx->excl_opt->long_name, 0);
 484         }
 485         return PARSE_OPT_HELP;
 486 }
 487
 488 int parse_options_end(struct parse_opt_ctx_t *ctx)
 489 {
 490         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 491         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 492         return ctx->cpidx + ctx->argc;
 493 }
 494
 495 int parse_options_subcommand(int argc, const char **argv, const struct option *options,
 496                         const char *const subcommands[], const char *usagestr[], int flags)
 497 {
 498         struct parse_opt_ctx_t ctx;
 499
 500         perf_env__set_cmdline(&perf_env, argc, argv);
 501
 502         /* build usage string if it's not provided */
 503         if (subcommands && !usagestr[0]) {
 504                 struct strbuf buf = STRBUF_INIT;
 505
 506                 strbuf_addf(&buf, "perf %s [<options>] {", argv[0]);
 507                 for (int i = 0; subcommands[i]; i++) {
 508                         if (i)
 509                                 strbuf_addstr(&buf, "|");
 510                         strbuf_addstr(&buf, subcommands[i]);
 511                 }
 512                 strbuf_addstr(&buf, "}");
 513
 514                 usagestr[0] = strdup(buf.buf);
 515                 strbuf_release(&buf);
 516         }
 517
 518         parse_options_start(&ctx, argc, argv, flags);
 519         switch (parse_options_step(&ctx, options, usagestr)) {
 520         case PARSE_OPT_HELP:
 521                 exit(129);
 522         case PARSE_OPT_DONE:
 523                 break;
 524         case PARSE_OPT_LIST_OPTS:
 525                 while (options->type != OPTION_END) {
 526                         if (options->long_name)
 527                                 printf("--%s ", options->long_name);
 528                         options++;
 529                 }
 530                 putchar('\n');
 531                 exit(130);
 532         case PARSE_OPT_LIST_SUBCMDS:
 533                 if (subcommands) {
 534                         for (int i = 0; subcommands[i]; i++)
 535                                 printf("%s ", subcommands[i]);
 536                 }
 537                 putchar('\n');
 538                 exit(130);
 539         default: /* PARSE_OPT_UNKNOWN */
 540                 if (ctx.argv[0][1] == '-') {
 541                         error("unknown option `%s'", ctx.argv[0] + 2);
 542                 } else {
 543                         error("unknown switch `%c'", *ctx.opt);
 544                 }
 545                 usage_with_options(usagestr, options);
 546         }
 547
 548         return parse_options_end(&ctx);
 549 }
 550
 551 int parse_options(int argc, const char **argv, const struct option *options,
 552                   const char * const usagestr[], int flags)
 553 {
 554         return parse_options_subcommand(argc, argv, options, NULL,
 555                                         (const char **) usagestr, flags);
 556 }
 557
 558 #define USAGE_OPTS_WIDTH 24
 559 #define USAGE_GAP         2
 560
 561 static void print_option_help(const struct option *opts, int full)
 562 {
 563         size_t pos;
 564         int pad;
 565
 566         if (opts->type == OPTION_GROUP) {
 567                 fputc('\n', stderr);
 568                 if (*opts->help)
 569                         fprintf(stderr, "%s\n", opts->help);
 570                 return;
 571         }
 572         if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 573                 return;
 574         if (opts->flags & PARSE_OPT_DISABLED)
 575                 return;
 576
 577         pos = fprintf(stderr, "    ");
 578         if (opts->short_name)
 579                 pos += fprintf(stderr, "-%c", opts->short_name);
 580         else
 581                 pos += fprintf(stderr, "    ");
 582
 583         if (opts->long_name && opts->short_name)
 584                 pos += fprintf(stderr, ", ");
 585         if (opts->long_name)
 586                 pos += fprintf(stderr, "--%s", opts->long_name);
 587
 588         switch (opts->type) {
 589         case OPTION_ARGUMENT:
 590                 break;
 591         case OPTION_LONG:
 592         case OPTION_U64:
 593         case OPTION_INTEGER:
 594         case OPTION_UINTEGER:
 595                 if (opts->flags & PARSE_OPT_OPTARG)
 596                         if (opts->long_name)
 597                                 pos += fprintf(stderr, "[=<n>]");
 598                         else
 599                                 pos += fprintf(stderr, "[<n>]");
 600                 else
 601                         pos += fprintf(stderr, " <n>");
 602                 break;
 603         case OPTION_CALLBACK:
 604                 if (opts->flags & PARSE_OPT_NOARG)
 605                         break;
 606                 /* FALLTHROUGH */
 607         case OPTION_STRING:
 608                 if (opts->argh) {
 609                         if (opts->flags & PARSE_OPT_OPTARG)
 610                                 if (opts->long_name)
 611                                         pos += fprintf(stderr, "[=<%s>]", opts->argh);
 612                                 else
 613                                         pos += fprintf(stderr, "[<%s>]", opts->argh);
 614                         else
 615                                 pos += fprintf(stderr, " <%s>", opts->argh);
 616                 } else {
 617                         if (opts->flags & PARSE_OPT_OPTARG)
 618                                 if (opts->long_name)
 619                                         pos += fprintf(stderr, "[=...]");
 620                                 else
 621                                         pos += fprintf(stderr, "[...]");
 622                         else
 623                                 pos += fprintf(stderr, " ...");
 624                 }
 625                 break;
 626         default: /* OPTION_{BIT,BOOLEAN,SET_UINT,SET_PTR} */
 627         case OPTION_END:
 628         case OPTION_GROUP:
 629         case OPTION_BIT:
 630         case OPTION_BOOLEAN:
 631         case OPTION_INCR:
 632         case OPTION_SET_UINT:
 633         case OPTION_SET_PTR:
 634                 break;
 635         }
 636
 637         if (pos <= USAGE_OPTS_WIDTH)
 638                 pad = USAGE_OPTS_WIDTH - pos;
 639         else {
 640                 fputc('\n', stderr);
 641                 pad = USAGE_OPTS_WIDTH;
 642         }
 643         fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 644 }
 645
 646 static int option__cmp(const void *va, const void *vb)
 647 {
 648         const struct option *a = va, *b = vb;
 649         int sa = tolower(a->short_name), sb = tolower(b->short_name), ret;
 650
 651         if (sa == 0)
 652                 sa = 'z' + 1;
 653         if (sb == 0)
 654                 sb = 'z' + 1;
 655
 656         ret = sa - sb;
 657
 658         if (ret == 0) {
 659                 const char *la = a->long_name ?: "",
 660                            *lb = b->long_name ?: "";
 661                 ret = strcmp(la, lb);
 662         }
 663
 664         return ret;
 665 }
 666
 667 static struct option *options__order(const struct option *opts)
 668 {
 669         int nr_opts = 0;
 670         const struct option *o = opts;
 671         struct option *ordered;
 672
 673         for (o = opts; o->type != OPTION_END; o++)
 674                 ++nr_opts;
 675
 676         ordered = memdup(opts, sizeof(*o) * (nr_opts + 1));
 677         if (ordered == NULL)
 678                 goto out;
 679
 680         qsort(ordered, nr_opts, sizeof(*o), option__cmp);
 681 out:
 682         return ordered;
 683 }
 684
 685 int usage_with_options_internal(const char * const *usagestr,
 686                                 const struct option *opts, int full)
 687 {
 688         struct option *ordered;
 689
 690         if (!usagestr)
 691                 return PARSE_OPT_HELP;
 692
 693         fprintf(stderr, "\n Usage: %s\n", *usagestr++);
 694         while (*usagestr && **usagestr)
 695                 fprintf(stderr, "    or: %s\n", *usagestr++);
 696         while (*usagestr) {
 697                 fprintf(stderr, "%s%s\n",
 698                                 **usagestr ? "    " : "",
 699                                 *usagestr);
 700                 usagestr++;
 701         }
 702
 703         if (opts->type != OPTION_GROUP)
 704                 fputc('\n', stderr);
 705
 706         ordered = options__order(opts);
 707         if (ordered)
 708                 opts = ordered;
 709
 710         for (  ; opts->type != OPTION_END; opts++)
 711                 print_option_help(opts, full);
 712
 713         fputc('\n', stderr);
 714
 715         free(ordered);
 716
 717         return PARSE_OPT_HELP;
 718 }
 719
 720 void usage_with_options(const char * const *usagestr,
 721                         const struct option *opts)
 722 {
 723         exit_browser(false);
 724         usage_with_options_internal(usagestr, opts, 0);
 725         exit(129);
 726 }
 727
 728 int parse_options_usage(const char * const *usagestr,
 729                         const struct option *opts,
 730                         const char *optstr, bool short_opt)
 731 {
 732         if (!usagestr)
 733                 goto opt;
 734
 735         fprintf(stderr, "\n Usage: %s\n", *usagestr++);
 736         while (*usagestr && **usagestr)
 737                 fprintf(stderr, "    or: %s\n", *usagestr++);
 738         while (*usagestr) {
 739                 fprintf(stderr, "%s%s\n",
 740                                 **usagestr ? "    " : "",
 741                                 *usagestr);
 742                 usagestr++;
 743         }
 744         fputc('\n', stderr);
 745
 746 opt:
 747         for (  ; opts->type != OPTION_END; opts++) {
 748                 if (short_opt) {
 749                         if (opts->short_name == *optstr)
 750                                 break;
 751                         continue;
 752                 }
 753
 754                 if (opts->long_name == NULL)
 755                         continue;
 756
 757                 if (!prefixcmp(optstr, opts->long_name))
 758                         break;
 759                 if (!prefixcmp(optstr, "no-") &&
 760                     !prefixcmp(optstr + 3, opts->long_name))
 761                         break;
 762         }
 763
 764         if (opts->type != OPTION_END)
 765                 print_option_help(opts, 0);
 766
 767         return PARSE_OPT_HELP;
 768 }
 769
 770
 771 int parse_opt_verbosity_cb(const struct option *opt,
 772                            const char *arg __maybe_unused,
 773                            int unset)
 774 {
 775         int *target = opt->value;
 776
 777         if (unset)
 778                 /* --no-quiet, --no-verbose */
 779                 *target = 0;
 780         else if (opt->short_name == 'v') {
 781                 if (*target >= 0)
 782                         (*target)++;
 783                 else
 784                         *target = 1;
 785         } else {
 786                 if (*target <= 0)
 787                         (*target)--;
 788                 else
 789                         *target = -1;
 790         }
 791         return 0;
 792 }
 793
 794 void set_option_flag(struct option *opts, int shortopt, const char *longopt,
 795                      int flag)
 796 {
 797         for (; opts->type != OPTION_END; opts++) {
 798                 if ((shortopt && opts->short_name == shortopt) ||
 799                     (opts->long_name && longopt &&
 800                      !strcmp(opts->long_name, longopt))) {
 801                         opts->flags |= flag;
 802                         break;
 803                 }
 804         }
 805 }