tools/perf/util/parse-options.c

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