isl_arg.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include "isl_arg.h"
  15 #include <isl_ctx.h>
  16
  17 static void set_default_choice(struct isl_arg *arg, void *opt)
  18 {
  19         *(unsigned *)(((char *)opt) + arg->offset) = arg->u.choice.default_value;
  20 }
  21
  22 static void set_default_flags(struct isl_arg *arg, void *opt)
  23 {
  24         *(unsigned *)(((char *)opt) + arg->offset) = arg->u.flags.default_value;
  25 }
  26
  27 static void set_default_bool(struct isl_arg *arg, void *opt)
  28 {
  29         *(unsigned *)(((char *)opt) + arg->offset) = arg->u.b.default_value;
  30 }
  31
  32 static void set_default_child(struct isl_arg *arg, void *opt)
  33 {
  34         void *child = calloc(1, arg->u.child.size);
  35
  36         if (child)
  37                 isl_arg_set_defaults(arg->u.child.child, child);
  38
  39         *(void **)(((char *)opt) + arg->offset) = child;
  40 }
  41
  42 static void set_default_user(struct isl_arg *arg, void *opt)
  43 {
  44         arg->u.user.init(((char *)opt) + arg->offset);
  45 }
  46
  47 static void set_default_long(struct isl_arg *arg, void *opt)
  48 {
  49         *(long *)(((char *)opt) + arg->offset) = arg->u.l.default_value;
  50 }
  51
  52 static void set_default_ulong(struct isl_arg *arg, void *opt)
  53 {
  54         *(unsigned long *)(((char *)opt) + arg->offset) = arg->u.ul.default_value;
  55 }
  56
  57 static void set_default_str(struct isl_arg *arg, void *opt)
  58 {
  59         const char *str = NULL;
  60         if (arg->u.str.default_value)
  61                 str = strdup(arg->u.str.default_value);
  62         *(const char **)(((char *)opt) + arg->offset) = str;
  63 }
  64
  65 void isl_arg_set_defaults(struct isl_arg *arg, void *opt)
  66 {
  67         int i;
  68
  69         for (i = 0; arg[i].type != isl_arg_end; ++i) {
  70                 switch (arg[i].type) {
  71                 case isl_arg_choice:
  72                         set_default_choice(&arg[i], opt);
  73                         break;
  74                 case isl_arg_flags:
  75                         set_default_flags(&arg[i], opt);
  76                         break;
  77                 case isl_arg_bool:
  78                         set_default_bool(&arg[i], opt);
  79                         break;
  80                 case isl_arg_child:
  81                         set_default_child(&arg[i], opt);
  82                         break;
  83                 case isl_arg_user:
  84                         set_default_user(&arg[i], opt);
  85                         break;
  86                 case isl_arg_long:
  87                         set_default_long(&arg[i], opt);
  88                         break;
  89                 case isl_arg_ulong:
  90                         set_default_ulong(&arg[i], opt);
  91                         break;
  92                 case isl_arg_arg:
  93                 case isl_arg_str:
  94                         set_default_str(&arg[i], opt);
  95                         break;
  96                 case isl_arg_version:
  97                 case isl_arg_end:
  98                         break;
  99                 }
 100         }
 101 }
 102
 103 void isl_arg_free(struct isl_arg *arg, void *opt)
 104 {
 105         int i;
 106
 107         if (!opt)
 108                 return;
 109
 110         for (i = 0; arg[i].type != isl_arg_end; ++i) {
 111                 switch (arg[i].type) {
 112                 case isl_arg_child:
 113                         isl_arg_free(arg[i].u.child.child,
 114                                 *(void **)(((char *)opt) + arg[i].offset));
 115                         break;
 116                 case isl_arg_arg:
 117                 case isl_arg_str:
 118                         free(*(char **)(((char *)opt) + arg[i].offset));
 119                         break;
 120                 case isl_arg_user:
 121                         if (arg[i].u.user.clear)
 122                                 arg[i].u.user.clear(((char *)opt) + arg[i].offset);
 123                         break;
 124                 case isl_arg_bool:
 125                 case isl_arg_choice:
 126                 case isl_arg_flags:
 127                 case isl_arg_long:
 128                 case isl_arg_ulong:
 129                 case isl_arg_version:
 130                 case isl_arg_end:
 131                         break;
 132                 }
 133         }
 134
 135         free(opt);
 136 }
 137
 138 static int print_arg_help(struct isl_arg *decl, const char *prefix, int no)
 139 {
 140         int len = 0;
 141
 142         if (!decl->long_name) {
 143                 printf("  -%c", decl->short_name);
 144                 return 4;
 145         }
 146
 147         if (decl->short_name)
 148                 printf("  -%c, --", decl->short_name);
 149         else
 150                 printf("      --");
 151         len += 8;
 152
 153         if (prefix) {
 154                 printf("%s-", prefix);
 155                 len += strlen(prefix) + 1;
 156         }
 157         if (no) {
 158                 printf("no-");
 159                 len += 3;
 160         }
 161         printf("%s", decl->long_name);
 162         len += strlen(decl->long_name);
 163
 164         return len;
 165 }
 166
 167 const void *isl_memrchr(const void *s, int c, size_t n)
 168 {
 169         const char *p = s;
 170         while (n-- > 0)
 171                 if (p[n] == c)
 172                         return p + n;
 173         return NULL;
 174 }
 175
 176 static int print_help_msg(struct isl_arg *decl, int pos)
 177 {
 178         int len;
 179         const char *s;
 180
 181         if (!decl->help_msg)
 182                 return pos;
 183
 184         if (pos >= 29)
 185                 printf("\n%30s", "");
 186         else
 187                 printf("%*s", 30 - pos, "");
 188
 189         s = decl->help_msg;
 190         len = strlen(s);
 191         while (len > 45) {
 192                 const char *space = isl_memrchr(s, ' ', 45);
 193                 int l;
 194
 195                 if (!space)
 196                         space = strchr(s + 45, ' ');
 197                 if (!space)
 198                         break;
 199                 l = space - s;
 200                 printf("%.*s", l, s);
 201                 s = space + 1;
 202                 len -= l + 1;
 203                 printf("\n%30s", "");
 204         }
 205
 206         printf("%s", s);
 207         return len;
 208 }
 209
 210 static void print_default(struct isl_arg *decl, const char *def, int pos)
 211 {
 212         int i;
 213         const char *default_prefix = "[default: ";
 214         const char *default_suffix = "]";
 215         int len;
 216
 217         len = strlen(default_prefix) + strlen(def) + strlen(default_suffix);
 218
 219         if (!decl->help_msg) {
 220                 if (pos >= 29)
 221                         printf("\n%30s", "");
 222                 else
 223                         printf("%*s", 30 - pos, "");
 224                 pos = 0;
 225         } else {
 226                 if (pos + len >= 48)
 227                         printf("\n%30s", "");
 228                 else
 229                         printf(" ");
 230         }
 231         printf("%s%s%s", default_prefix, def, default_suffix);
 232 }
 233
 234 static void print_default_choice(struct isl_arg *decl, int pos)
 235 {
 236         int i;
 237         const char *s = "none";
 238
 239         for (i = 0; decl->u.choice.choice[i].name; ++i)
 240                 if (decl->u.choice.choice[i].value == decl->u.choice.default_value) {
 241                         s = decl->u.choice.choice[i].name;
 242                         break;
 243                 }
 244
 245         print_default(decl, s, pos);
 246 }
 247
 248 static void print_choice_help(struct isl_arg *decl, const char *prefix)
 249 {
 250         int i;
 251         int pos;
 252
 253         pos = print_arg_help(decl, prefix, 0);
 254         printf("=");
 255         pos++;
 256
 257         for (i = 0; decl->u.choice.choice[i].name; ++i) {
 258                 if (i) {
 259                         printf("|");
 260                         pos++;
 261                 }
 262                 printf("%s", decl->u.choice.choice[i].name);
 263                 pos += strlen(decl->u.choice.choice[i].name);
 264         }
 265
 266         pos = print_help_msg(decl, pos);
 267         print_default_choice(decl, pos);
 268
 269         printf("\n");
 270 }
 271
 272 static void print_default_flags(struct isl_arg *decl, int pos)
 273 {
 274         int i, first;
 275         const char *default_prefix = "[default: ";
 276         const char *default_suffix = "]";
 277         int len = strlen(default_prefix) + strlen(default_suffix);
 278
 279         for (i = 0; decl->u.flags.flags[i].name; ++i)
 280                 if ((decl->u.flags.default_value & decl->u.flags.flags[i].mask) ==
 281                      decl->u.flags.flags[i].value)
 282                         len += strlen(decl->u.flags.flags[i].name);
 283
 284         if (!decl->help_msg) {
 285                 if (pos >= 29)
 286                         printf("\n%30s", "");
 287                 else
 288                         printf("%*s", 30 - pos, "");
 289                 pos = 0;
 290         } else {
 291                 if (pos + len >= 48)
 292                         printf("\n%30s", "");
 293                 else
 294                         printf(" ");
 295         }
 296         printf("%s", default_prefix);
 297
 298         for (first = 1, i = 0; decl->u.flags.flags[i].name; ++i)
 299                 if ((decl->u.flags.default_value & decl->u.flags.flags[i].mask) ==
 300                      decl->u.flags.flags[i].value) {
 301                         if (!first)
 302                                 printf(",");
 303                         printf("%s", decl->u.flags.flags[i].name);
 304                         first = 0;
 305                 }
 306
 307         printf("%s", default_suffix);
 308 }
 309
 310 static void print_flags_help(struct isl_arg *decl, const char *prefix)
 311 {
 312         int i, j;
 313         int pos;
 314
 315         pos = print_arg_help(decl, prefix, 0);
 316         printf("=");
 317         pos++;
 318
 319         for (i = 0; decl->u.flags.flags[i].name; ++i) {
 320                 if (i) {
 321                         printf(",");
 322                         pos++;
 323                 }
 324                 for (j = i;
 325                      decl->u.flags.flags[j].mask == decl->u.flags.flags[i].mask;
 326                      ++j) {
 327                         if (j != i) {
 328                                 printf("|");
 329                                 pos++;
 330                         }
 331                         printf("%s", decl->u.flags.flags[j].name);
 332                         pos += strlen(decl->u.flags.flags[j].name);
 333                 }
 334                 i = j - 1;
 335         }
 336
 337         pos = print_help_msg(decl, pos);
 338         print_default_flags(decl, pos);
 339
 340         printf("\n");
 341 }
 342
 343 static void print_bool_help(struct isl_arg *decl, const char *prefix)
 344 {
 345         int pos;
 346         int no = decl->u.b.default_value == 1;
 347         pos = print_arg_help(decl, prefix, no);
 348         pos = print_help_msg(decl, pos);
 349         print_default(decl, no ? "yes" : "no", pos);
 350         printf("\n");
 351 }
 352
 353 static void print_long_help(struct isl_arg *decl, const char *prefix)
 354 {
 355         int pos;
 356         pos = print_arg_help(decl, prefix, 0);
 357         if (decl->u.l.default_value != decl->u.l.default_selected) {
 358                 printf("[");
 359                 pos++;
 360         }
 361         printf("=long");
 362         pos += 5;
 363         if (decl->u.l.default_value != decl->u.l.default_selected) {
 364                 printf("]");
 365                 pos++;
 366         }
 367         print_help_msg(decl, pos);
 368         printf("\n");
 369 }
 370
 371 static void print_ulong_help(struct isl_arg *decl, const char *prefix)
 372 {
 373         int pos;
 374         pos = print_arg_help(decl, prefix, 0);
 375         printf("=ulong");
 376         pos += 6;
 377         print_help_msg(decl, pos);
 378         printf("\n");
 379 }
 380
 381 static void print_str_help(struct isl_arg *decl, const char *prefix)
 382 {
 383         int pos;
 384         const char *a = decl->argument_name ? decl->argument_name : "string";
 385         pos = print_arg_help(decl, prefix, 0);
 386         printf("=%s", a);
 387         pos += 1 + strlen(a);
 388         print_help_msg(decl, pos);
 389         printf("\n");
 390 }
 391
 392 static void print_help(struct isl_arg *arg, const char *prefix)
 393 {
 394         int i;
 395
 396         for (i = 0; arg[i].type != isl_arg_end; ++i) {
 397                 switch (arg[i].type) {
 398                 case isl_arg_flags:
 399                         print_flags_help(&arg[i], prefix);
 400                         break;
 401                 case isl_arg_choice:
 402                         print_choice_help(&arg[i], prefix);
 403                         break;
 404                 case isl_arg_bool:
 405                         print_bool_help(&arg[i], prefix);
 406                         break;
 407                 case isl_arg_long:
 408                         print_long_help(&arg[i], prefix);
 409                         break;
 410                 case isl_arg_ulong:
 411                         print_ulong_help(&arg[i], prefix);
 412                         break;
 413                 case isl_arg_str:
 414                         print_str_help(&arg[i], prefix);
 415                         break;
 416                 case isl_arg_version:
 417                         printf("  -V, --version\n");
 418                         break;
 419                 case isl_arg_arg:
 420                 case isl_arg_child:
 421                 case isl_arg_user:
 422                 case isl_arg_end:
 423                         break;
 424                 }
 425         }
 426
 427         for (i = 0; arg[i].type != isl_arg_end; ++i) {
 428                 if (arg[i].type != isl_arg_child)
 429                         continue;
 430
 431                 printf("\n");
 432                 if (arg[i].help_msg)
 433                         printf(" %s\n", arg[i].help_msg);
 434                 print_help(arg[i].u.child.child, arg[i].long_name);
 435         }
 436 }
 437
 438 static const char *prog_name(const char *prog)
 439 {
 440         const char *slash;
 441
 442         slash = strrchr(prog, '/');
 443         if (slash)
 444                 prog = slash + 1;
 445         if (strncmp(prog, "lt-", 3) == 0)
 446                 prog += 3;
 447
 448         return prog;
 449 }
 450
 451 static void print_help_and_exit(struct isl_arg *arg, const char *prog)
 452 {
 453         int i;
 454
 455         printf("Usage: %s [OPTION...]", prog_name(prog));
 456
 457         for (i = 0; arg[i].type != isl_arg_end; ++i)
 458                 if (arg[i].type == isl_arg_arg)
 459                         printf(" %s", arg[i].argument_name);
 460
 461         printf("\n\n");
 462
 463         print_help(arg, NULL);
 464
 465         exit(0);
 466 }
 467
 468 static const char *skip_name(struct isl_arg *decl, const char *arg,
 469         const char *prefix, int need_argument, int *has_argument)
 470 {
 471         const char *equal;
 472         const char *name;
 473         const char *end;
 474
 475         if (arg[0] == '-' && arg[1] && arg[1] == decl->short_name) {
 476                 if (need_argument && !arg[2])
 477                         return NULL;
 478                 if (has_argument)
 479                         *has_argument = arg[2] != '\0';
 480                 return arg + 2;
 481         }
 482
 483         if (strncmp(arg, "--", 2))
 484                 return NULL;
 485
 486         name = arg + 2;
 487         equal = strchr(name, '=');
 488         if (need_argument && !equal)
 489                 return NULL;
 490
 491         if (has_argument)
 492                 *has_argument = !!equal;
 493         end = equal ? equal : name + strlen(name);
 494
 495         if (prefix) {
 496                 size_t prefix_len = strlen(prefix);
 497                 if (strncmp(name, prefix, prefix_len) == 0 &&
 498                     name[prefix_len] == '-')
 499                         name += prefix_len + 1;
 500         }
 501
 502         if (end - name != strlen(decl->long_name) ||
 503             strncmp(name, decl->long_name, end - name))
 504                 return NULL;
 505
 506         return equal ? equal + 1 : end;
 507 }
 508
 509 static int parse_choice_option(struct isl_arg *decl, char **arg,
 510         const char *prefix, void *opt)
 511 {
 512         int i;
 513         int has_argument;
 514         const char *choice;
 515
 516         choice = skip_name(decl, arg[0], prefix, 0, &has_argument);
 517         if (!choice)
 518                 return 0;
 519
 520         if (!has_argument && (!arg[1] || arg[1][0] == '-')) {
 521                 unsigned u = decl->u.choice.default_selected;
 522                 if (decl->u.choice.set)
 523                         decl->u.choice.set(opt, u);
 524                 else
 525                         *(unsigned *)(((char *)opt) + decl->offset) = u;
 526
 527                 return 1;
 528         }
 529
 530         if (!has_argument)
 531                 choice = arg[1];
 532
 533         for (i = 0; decl->u.choice.choice[i].name; ++i) {
 534                 unsigned u;
 535
 536                 if (strcmp(choice, decl->u.choice.choice[i].name))
 537                         continue;
 538
 539                 u = decl->u.choice.choice[i].value;
 540                 if (decl->u.choice.set)
 541                         decl->u.choice.set(opt, u);
 542                 else
 543                         *(unsigned *)(((char *)opt) + decl->offset) = u;
 544
 545                 return has_argument ? 1 : 2;
 546         }
 547
 548         return 0;
 549 }
 550
 551 static int set_flag(struct isl_arg *decl, unsigned *val, const char *flag,
 552         size_t len)
 553 {
 554         int i;
 555
 556         for (i = 0; decl->u.flags.flags[i].name; ++i) {
 557                 if (strncmp(flag, decl->u.flags.flags[i].name, len))
 558                         continue;
 559
 560                 *val &= ~decl->u.flags.flags[i].mask;
 561                 *val |= decl->u.flags.flags[i].value;
 562
 563                 return 1;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static int parse_flags_option(struct isl_arg *decl, char **arg,
 570         const char *prefix, void *opt)
 571 {
 572         int has_argument;
 573         const char *flags;
 574         const char *comma;
 575         unsigned val;
 576
 577         flags = skip_name(decl, arg[0], prefix, 0, &has_argument);
 578         if (!flags)
 579                 return 0;
 580
 581         if (!has_argument && !arg[1])
 582                 return 0;
 583
 584         if (!has_argument)
 585                 flags = arg[1];
 586
 587         val = *(unsigned *)(((char *)opt) + decl->offset);
 588
 589         while ((comma = strchr(flags, ',')) != NULL) {
 590                 if (!set_flag(decl, &val, flags, comma - flags))
 591                         return 0;
 592                 flags = comma + 1;
 593         }
 594         if (!set_flag(decl, &val, flags, strlen(flags)))
 595                 return 0;
 596
 597         *(unsigned *)(((char *)opt) + decl->offset) = val;
 598
 599         return has_argument ? 1 : 2;
 600 }
 601
 602 static int parse_bool_option(struct isl_arg *decl, const char *arg,
 603         const char *prefix, void *opt)
 604 {
 605         if (skip_name(decl, arg, prefix, 0, NULL)) {
 606                 *(unsigned *)(((char *)opt) + decl->offset) = 1;
 607
 608                 return 1;
 609         }
 610
 611         if (strncmp(arg, "--", 2))
 612                 return 0;
 613         arg += 2;
 614
 615         if (prefix) {
 616                 size_t prefix_len = strlen(prefix);
 617                 if (strncmp(arg, prefix, prefix_len) == 0 &&
 618                     arg[prefix_len] == '-') {
 619                         arg += prefix_len + 1;
 620                         prefix = NULL;
 621                 }
 622         }
 623
 624         if (strncmp(arg, "no-", 3))
 625                 return 0;
 626         arg += 3;
 627
 628         if (prefix) {
 629                 size_t prefix_len = strlen(prefix);
 630                 if (strncmp(arg, prefix, prefix_len) == 0 &&
 631                     arg[prefix_len] == '-')
 632                         arg += prefix_len + 1;
 633         }
 634
 635         if (!strcmp(arg, decl->long_name)) {
 636                 *(unsigned *)(((char *)opt) + decl->offset) = 0;
 637
 638                 return 1;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static int parse_str_option(struct isl_arg *decl, char **arg,
 645         const char *prefix, void *opt)
 646 {
 647         int has_argument;
 648         const char *s;
 649         char **p = (char **)(((char *)opt) + decl->offset);
 650
 651         s = skip_name(decl, arg[0], prefix, 0, &has_argument);
 652         if (!s)
 653                 return 0;
 654
 655         if (has_argument) {
 656                 *p = strdup(s);
 657                 return 1;
 658         }
 659
 660         if (arg[1]) {
 661                 *p = strdup(arg[1]);
 662                 return 2;
 663         }
 664
 665         return 0;
 666 }
 667
 668 static int parse_long_option(struct isl_arg *decl, char **arg,
 669         const char *prefix, void *opt)
 670 {
 671         int has_argument;
 672         const char *val;
 673         char *endptr;
 674         long *p = (long *)(((char *)opt) + decl->offset);
 675
 676         val = skip_name(decl, arg[0], prefix, 0, &has_argument);
 677         if (!val)
 678                 return 0;
 679
 680         if (has_argument) {
 681                 long l = strtol(val, NULL, 0);
 682                 if (decl->u.l.set)
 683                         decl->u.l.set(opt, l);
 684                 else
 685                         *p = l;
 686                 return 1;
 687         }
 688
 689         if (arg[1]) {
 690                 long l = strtol(arg[1], &endptr, 0);
 691                 if (*endptr == '\0') {
 692                         if (decl->u.l.set)
 693                                 decl->u.l.set(opt, l);
 694                         else
 695                                 *p = l;
 696                         return 2;
 697                 }
 698         }
 699
 700         if (decl->u.l.default_value != decl->u.l.default_selected) {
 701                 if (decl->u.l.set)
 702                         decl->u.l.set(opt, decl->u.l.default_selected);
 703                 else
 704                         *p = decl->u.l.default_selected;
 705                 return 1;
 706         }
 707
 708         return 0;
 709 }
 710
 711 static int parse_ulong_option(struct isl_arg *decl, char **arg,
 712         const char *prefix, void *opt)
 713 {
 714         int has_argument;
 715         const char *val;
 716         char *endptr;
 717         unsigned long *p = (unsigned long *)(((char *)opt) + decl->offset);
 718
 719         val = skip_name(decl, arg[0], prefix, 0, &has_argument);
 720         if (!val)
 721                 return 0;
 722
 723         if (has_argument) {
 724                 *p = strtoul(val, NULL, 0);
 725                 return 1;
 726         }
 727
 728         if (arg[1]) {
 729                 unsigned long ul = strtoul(arg[1], &endptr, 0);
 730                 if (*endptr == '\0') {
 731                         *p = ul;
 732                         return 2;
 733                 }
 734         }
 735
 736         return 0;
 737 }
 738
 739 static int parse_option(struct isl_arg *decl, char **arg,
 740         const char *prefix, void *opt);
 741
 742 static int parse_child_option(struct isl_arg *decl, char **arg, void *opt)
 743 {
 744         return parse_option(decl->u.child.child, arg, decl->long_name,
 745                                 *(void **)(((char *)opt) + decl->offset));
 746 }
 747
 748 static int parse_option(struct isl_arg *decl, char **arg,
 749         const char *prefix, void *opt)
 750 {
 751         int i;
 752
 753         for (i = 0; decl[i].type != isl_arg_end; ++i) {
 754                 int parsed = 0;
 755                 switch (decl[i].type) {
 756                 case isl_arg_choice:
 757                         parsed = parse_choice_option(&decl[i], arg, prefix, opt);
 758                         break;
 759                 case isl_arg_flags:
 760                         parsed = parse_flags_option(&decl[i], arg, prefix, opt);
 761                         break;
 762                 case isl_arg_long:
 763                         parsed = parse_long_option(&decl[i], arg, prefix, opt);
 764                         break;
 765                 case isl_arg_ulong:
 766                         parsed = parse_ulong_option(&decl[i], arg, prefix, opt);
 767                         break;
 768                 case isl_arg_bool:
 769                         parsed = parse_bool_option(&decl[i], *arg, prefix, opt);
 770                         break;
 771                 case isl_arg_str:
 772                         parsed = parse_str_option(&decl[i], arg, prefix, opt);
 773                         break;
 774                 case isl_arg_child:
 775                         parsed = parse_child_option(&decl[i], arg, opt);
 776                         break;
 777                 case isl_arg_arg:
 778                 case isl_arg_user:
 779                 case isl_arg_version:
 780                 case isl_arg_end:
 781                         break;
 782                 }
 783                 if (parsed)
 784                         return parsed;
 785         }
 786
 787         return 0;
 788 }
 789
 790 static int any_version(struct isl_arg *decl)
 791 {
 792         int i;
 793
 794         for (i = 0; decl[i].type != isl_arg_end; ++i) {
 795                 switch (decl[i].type) {
 796                 case isl_arg_version:
 797                         return 1;
 798                 case isl_arg_child:
 799                         if (any_version(decl[i].u.child.child))
 800                                 return 1;
 801                         break;
 802                 default:
 803                         break;
 804                 }
 805         }
 806
 807         return 0;
 808 }
 809
 810 static void print_version(struct isl_arg *decl)
 811 {
 812         int i;
 813
 814         for (i = 0; decl[i].type != isl_arg_end; ++i) {
 815                 switch (decl[i].type) {
 816                 case isl_arg_version:
 817                         decl[i].u.version.print_version();
 818                         break;
 819                 case isl_arg_child:
 820                         print_version(decl[i].u.child.child);
 821                         break;
 822                 default:
 823                         break;
 824                 }
 825         }
 826 }
 827
 828 static void print_version_and_exit(struct isl_arg *decl)
 829 {
 830         print_version(decl);
 831
 832         exit(0);
 833 }
 834
 835 static int drop_argument(int argc, char **argv, int drop, int n)
 836 {
 837         for (; drop < argc; ++drop)
 838                 argv[drop] = argv[drop + n];
 839
 840         return argc - n;
 841 }
 842
 843 static int n_arg(struct isl_arg *arg)
 844 {
 845         int i;
 846         int n_arg = 0;
 847
 848         for (i = 0; arg[i].type != isl_arg_end; ++i)
 849                 if (arg[i].type == isl_arg_arg)
 850                         n_arg++;
 851
 852         return n_arg;
 853 }
 854
 855 int isl_arg_parse(struct isl_arg *arg, int argc, char **argv, void *opt,
 856         unsigned flags)
 857 {
 858         int skip = 0;
 859         int i;
 860         int n;
 861
 862         n = n_arg(arg);
 863
 864         for (i = 1; i < argc; ++i) {
 865                 if (strcmp(argv[i], "--help") == 0)
 866                         print_help_and_exit(arg, argv[0]);
 867         }
 868
 869         for (i = 1; i < argc; ++i) {
 870                 if ((strcmp(argv[i], "--version") == 0 ||
 871                      strcmp(argv[i], "-V") == 0) && any_version(arg))
 872                         print_version_and_exit(arg);
 873         }
 874
 875         while (argc > 1 + skip) {
 876                 int parsed;
 877                 if (argv[1 + skip][0] != '-')
 878                         break;
 879                 parsed = parse_option(arg, &argv[1 + skip], NULL, opt);
 880                 if (parsed)
 881                         argc = drop_argument(argc, argv, 1 + skip, parsed);
 882                 else if (ISL_FL_ISSET(flags, ISL_ARG_ALL)) {
 883                         fprintf(stderr, "%s: unrecognized option: %s\n",
 884                                         prog_name(argv[0]), argv[1 + skip]);
 885                         exit(-1);
 886                 } else
 887                         ++skip;
 888         }
 889
 890         if (ISL_FL_ISSET(flags, ISL_ARG_ALL) ? argc != 1 + n
 891                                              : argc < 1 + skip + n) {
 892                 fprintf(stderr, "%s: expecting %d arguments\n",
 893                                 prog_name(argv[0]), n);
 894                 exit(-1);
 895         }
 896
 897         for (i = 0; arg[i].type != isl_arg_end; ++i) {
 898                 const char *str;
 899                 if (arg[i].type != isl_arg_arg)
 900                         continue;
 901                 str = strdup(argv[1 + skip]);
 902                 *(const char **)(((char *)opt) + arg[i].offset) = str;
 903                 argc = drop_argument(argc, argv, 1 + skip, 1);
 904         }
 905
 906         return argc;
 907 }