scripts/config/symbol.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <ctype.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <regex.h>
  10 #include <sys/utsname.h>
  11
  12 #define LKC_DIRECT_LINK
  13 #include "lkc.h"
  14
  15 struct symbol symbol_yes = {
  16         .name = "y",
  17         .curr = { "y", yes },
  18         .flags = SYMBOL_YES|SYMBOL_VALID,
  19 }, symbol_mod = {
  20         .name = "m",
  21         .curr = { "m", mod },
  22         .flags = SYMBOL_MOD|SYMBOL_VALID,
  23 }, symbol_no = {
  24         .name = "n",
  25         .curr = { "n", no },
  26         .flags = SYMBOL_NO|SYMBOL_VALID,
  27 }, symbol_empty = {
  28         .name = "",
  29         .curr = { "", no },
  30         .flags = SYMBOL_VALID,
  31 };
  32
  33 int sym_change_count;
  34 struct symbol *modules_sym;
  35 tristate modules_val;
  36
  37 void sym_add_default(struct symbol *sym, const char *def)
  38 {
  39         struct property *prop = prop_alloc(P_DEFAULT, sym);
  40
  41         prop->expr = expr_alloc_symbol(sym_lookup(def, 1));
  42 }
  43
  44 void sym_init(void)
  45 {
  46         struct symbol *sym;
  47         struct utsname uts;
  48         char *p;
  49         static bool inited = false;
  50
  51         if (inited)
  52                 return;
  53         inited = true;
  54
  55         uname(&uts);
  56
  57         sym = sym_lookup("ARCH", 0);
  58         sym->type = S_STRING;
  59         p = getenv("ARCH");
  60         if (p)
  61                 sym_add_default(sym, p);
  62
  63         sym = sym_lookup("OPENWRTVERSION", 0);
  64         sym->type = S_STRING;
  65         sym->flags |= SYMBOL_AUTO;
  66         p = getenv("OPENWRTVERSION");
  67         if (p)
  68                 sym_add_default(sym, p);
  69
  70         sym = sym_lookup("UNAME_RELEASE", 0);
  71         sym->type = S_STRING;
  72         sym->flags |= SYMBOL_AUTO;
  73         sym_add_default(sym, uts.release);
  74 }
  75
  76 enum symbol_type sym_get_type(struct symbol *sym)
  77 {
  78         enum symbol_type type = sym->type;
  79
  80         if (type == S_TRISTATE) {
  81                 if (sym_is_choice_value(sym) && sym->visible == yes)
  82                         type = S_BOOLEAN;
  83 /* tristate always enabled */
  84 #if 0
  85                 else if (modules_val == no)
  86                         type = S_BOOLEAN;
  87 #endif
  88         }
  89         return type;
  90 }
  91
  92 const char *sym_type_name(enum symbol_type type)
  93 {
  94         switch (type) {
  95         case S_BOOLEAN:
  96                 return "boolean";
  97         case S_TRISTATE:
  98                 return "tristate";
  99         case S_INT:
 100                 return "integer";
 101         case S_HEX:
 102                 return "hex";
 103         case S_STRING:
 104                 return "string";
 105         case S_UNKNOWN:
 106                 return "unknown";
 107         case S_OTHER:
 108                 break;
 109         }
 110         return "???";
 111 }
 112
 113 struct property *sym_get_choice_prop(struct symbol *sym)
 114 {
 115         struct property *prop;
 116
 117         for_all_choices(sym, prop)
 118                 return prop;
 119         return NULL;
 120 }
 121
 122 struct property *sym_get_default_prop(struct symbol *sym)
 123 {
 124         struct property *prop;
 125
 126         for_all_defaults(sym, prop) {
 127                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 128                 if (prop->visible.tri != no)
 129                         return prop;
 130         }
 131         return NULL;
 132 }
 133
 134 struct property *sym_get_range_prop(struct symbol *sym)
 135 {
 136         struct property *prop;
 137
 138         for_all_properties(sym, prop, P_RANGE) {
 139                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 140                 if (prop->visible.tri != no)
 141                         return prop;
 142         }
 143         return NULL;
 144 }
 145
 146 static int sym_get_range_val(struct symbol *sym, int base)
 147 {
 148         sym_calc_value(sym);
 149         switch (sym->type) {
 150         case S_INT:
 151                 base = 10;
 152                 break;
 153         case S_HEX:
 154                 base = 16;
 155                 break;
 156         default:
 157                 break;
 158         }
 159         return strtol(sym->curr.val, NULL, base);
 160 }
 161
 162 static void sym_validate_range(struct symbol *sym)
 163 {
 164         struct property *prop;
 165         int base, val, val2;
 166         char str[64];
 167
 168         switch (sym->type) {
 169         case S_INT:
 170                 base = 10;
 171                 break;
 172         case S_HEX:
 173                 base = 16;
 174                 break;
 175         default:
 176                 return;
 177         }
 178         prop = sym_get_range_prop(sym);
 179         if (!prop)
 180                 return;
 181         val = strtol(sym->curr.val, NULL, base);
 182         val2 = sym_get_range_val(prop->expr->left.sym, base);
 183         if (val >= val2) {
 184                 val2 = sym_get_range_val(prop->expr->right.sym, base);
 185                 if (val <= val2)
 186                         return;
 187         }
 188         if (sym->type == S_INT)
 189                 sprintf(str, "%d", val2);
 190         else
 191                 sprintf(str, "0x%x", val2);
 192         sym->curr.val = strdup(str);
 193 }
 194
 195 static void sym_calc_visibility(struct symbol *sym)
 196 {
 197         struct property *prop;
 198         tristate tri;
 199         int deselected = 0;
 200
 201         /* any prompt visible? */
 202         tri = no;
 203         for_all_prompts(sym, prop) {
 204                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 205                 tri = E_OR(tri, prop->visible.tri);
 206         }
 207         if (tri == mod && (sym->type != S_TRISTATE))
 208                 tri = yes;
 209         if (sym->rev_dep_inv.expr && (expr_calc_value(sym->rev_dep_inv.expr) == yes)) {
 210                 tri = no;
 211                 deselected = 1;
 212         }
 213         if (sym->visible != tri) {
 214                 sym->visible = tri;
 215                 sym_set_changed(sym);
 216         }
 217         if (sym_is_choice_value(sym) || deselected)
 218                 return;
 219         tri = no;
 220         if (sym->rev_dep.expr)
 221                 tri = expr_calc_value(sym->rev_dep.expr);
 222         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 223                 tri = yes;
 224         if (sym->rev_dep.tri != tri) {
 225                 sym->rev_dep.tri = tri;
 226                 sym_set_changed(sym);
 227         }
 228 }
 229
 230 static struct symbol *sym_calc_choice(struct symbol *sym)
 231 {
 232         struct symbol *def_sym;
 233         struct property *prop;
 234         struct expr *e;
 235
 236         /* is the user choice visible? */
 237         def_sym = sym->user.val;
 238         if (def_sym) {
 239                 sym_calc_visibility(def_sym);
 240                 if (def_sym->visible != no)
 241                         return def_sym;
 242         }
 243
 244         /* any of the defaults visible? */
 245         for_all_defaults(sym, prop) {
 246                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 247                 if (prop->visible.tri == no)
 248                         continue;
 249                 def_sym = prop_get_symbol(prop);
 250                 sym_calc_visibility(def_sym);
 251                 if (def_sym->visible != no)
 252                         return def_sym;
 253         }
 254
 255         /* just get the first visible value */
 256         prop = sym_get_choice_prop(sym);
 257         for (e = prop->expr; e; e = e->left.expr) {
 258                 def_sym = e->right.sym;
 259                 sym_calc_visibility(def_sym);
 260                 if (def_sym->visible != no)
 261                         return def_sym;
 262         }
 263
 264         /* no choice? reset tristate value */
 265         sym->curr.tri = no;
 266         return NULL;
 267 }
 268
 269 void sym_set_changed(struct symbol *sym)
 270 {
 271         struct property *prop;
 272
 273         sym->flags |= SYMBOL_CHANGED;
 274         for (prop = sym->prop; prop; prop = prop->next) {
 275                 if (prop->menu)
 276                         prop->menu->flags |= MENU_CHANGED;
 277         }
 278 }
 279
 280 void sym_set_all_changed(void)
 281 {
 282         struct symbol *sym;
 283         int i;
 284
 285         for_all_symbols(i, sym)
 286                 sym_set_changed(sym);
 287 }
 288
 289 void sym_calc_value(struct symbol *sym)
 290 {
 291         struct symbol_value newval, oldval;
 292         struct property *prop;
 293         struct expr *e;
 294
 295         if (!sym)
 296                 return;
 297
 298         if (sym->flags & SYMBOL_VALID)
 299                 return;
 300         sym->flags |= SYMBOL_VALID;
 301
 302         oldval = sym->curr;
 303
 304         switch (sym->type) {
 305         case S_INT:
 306         case S_HEX:
 307         case S_STRING:
 308                 newval = symbol_empty.curr;
 309                 break;
 310         case S_BOOLEAN:
 311         case S_TRISTATE:
 312                 newval = symbol_no.curr;
 313                 break;
 314         default:
 315                 sym->curr.val = sym->name;
 316                 sym->curr.tri = no;
 317                 return;
 318         }
 319         if (!sym_is_choice_value(sym))
 320                 sym->flags &= ~SYMBOL_WRITE;
 321
 322         sym_calc_visibility(sym);
 323
 324         /* set default if recursively called */
 325         sym->curr = newval;
 326
 327         switch (sym_get_type(sym)) {
 328         case S_BOOLEAN:
 329         case S_TRISTATE:
 330                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 331                         prop = sym_get_choice_prop(sym);
 332                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 333                 } else if (sym->rev_dep_inv.expr && (expr_calc_value(sym->rev_dep_inv.expr) == yes)) {
 334                         newval.tri = no;
 335                 } else if (E_OR(sym->visible, sym->rev_dep.tri) != no) {
 336                         sym->flags |= SYMBOL_WRITE;
 337                         if (sym_has_value(sym))
 338                                 newval.tri = sym->user.tri;
 339                         else if (!sym_is_choice(sym)) {
 340                                 prop = sym_get_default_prop(sym);
 341                                 if (prop)
 342                                         newval.tri = expr_calc_value(prop->expr);
 343                         }
 344                         newval.tri = E_OR(E_AND(newval.tri, sym->visible), sym->rev_dep.tri);
 345                 } else if (!sym_is_choice(sym)) {
 346                         prop = sym_get_default_prop(sym);
 347                         if (prop) {
 348                                 sym->flags |= SYMBOL_WRITE;
 349                                 newval.tri = expr_calc_value(prop->expr);
 350                         }
 351                 }
 352                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 353                         newval.tri = yes;
 354                 break;
 355         case S_STRING:
 356         case S_HEX:
 357         case S_INT:
 358                 if (sym->visible != no) {
 359                         sym->flags |= SYMBOL_WRITE;
 360                         if (sym_has_value(sym)) {
 361                                 newval.val = sym->user.val;
 362                                 break;
 363                         }
 364                 }
 365                 prop = sym_get_default_prop(sym);
 366                 if (prop) {
 367                         struct symbol *ds = prop_get_symbol(prop);
 368                         if (ds) {
 369                                 sym->flags |= SYMBOL_WRITE;
 370                                 sym_calc_value(ds);
 371                                 newval.val = ds->curr.val;
 372                         }
 373                 }
 374                 break;
 375         default:
 376                 ;
 377         }
 378
 379         sym->curr = newval;
 380         if (sym_is_choice(sym) && newval.tri == yes)
 381                 sym->curr.val = sym_calc_choice(sym);
 382         sym_validate_range(sym);
 383
 384         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 385                 sym->flags &= ~SYMBOL_VALID;
 386                 sym_set_changed(sym);
 387                 if (modules_sym == sym) {
 388                         sym_set_all_changed();
 389                         modules_val = modules_sym->curr.tri;
 390                 }
 391         }
 392
 393         if (sym_is_choice(sym)) {
 394                 int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
 395                 prop = sym_get_choice_prop(sym);
 396                 for (e = prop->expr; e; e = e->left.expr) {
 397                         e->right.sym->flags |= flags;
 398                         if (flags & SYMBOL_CHANGED)
 399                                 sym_set_changed(e->right.sym);
 400                 }
 401         }
 402
 403         if (sym->flags & SYMBOL_AUTO)
 404                 sym->flags &= ~SYMBOL_WRITE;
 405 }
 406
 407 void sym_clear_all_valid(void)
 408 {
 409         struct symbol *sym;
 410         int i;
 411
 412         for_all_symbols(i, sym)
 413                 sym->flags &= ~SYMBOL_VALID;
 414         sym_change_count++;
 415         if (modules_sym)
 416                 sym_calc_value(modules_sym);
 417 }
 418
 419 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 420 {
 421         int type = sym_get_type(sym);
 422
 423         if (sym->visible == no)
 424                 return false;
 425
 426         if (type != S_BOOLEAN && type != S_TRISTATE)
 427                 return false;
 428
 429         if (type == S_BOOLEAN && val == mod)
 430                 return false;
 431         if (sym->visible <= sym->rev_dep.tri)
 432                 return false;
 433         if (sym_is_choice_value(sym) && sym->visible == yes)
 434                 return val == yes;
 435         return val >= sym->rev_dep.tri && val <= sym->visible;
 436 }
 437
 438 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 439 {
 440         tristate oldval = sym_get_tristate_value(sym);
 441
 442         if (oldval != val && !sym_tristate_within_range(sym, val))
 443                 return false;
 444
 445         if (sym->flags & SYMBOL_NEW) {
 446                 sym->flags &= ~SYMBOL_NEW;
 447                 sym_set_changed(sym);
 448         }
 449         /*
 450          * setting a choice value also resets the new flag of the choice
 451          * symbol and all other choice values.
 452          */
 453         if (sym_is_choice_value(sym) && val == yes) {
 454                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 455                 struct property *prop;
 456                 struct expr *e;
 457
 458                 cs->user.val = sym;
 459                 cs->flags &= ~SYMBOL_NEW;
 460                 prop = sym_get_choice_prop(cs);
 461                 for (e = prop->expr; e; e = e->left.expr) {
 462                         if (e->right.sym->visible != no)
 463                                 e->right.sym->flags &= ~SYMBOL_NEW;
 464                 }
 465         }
 466
 467         sym->user.tri = val;
 468         if (oldval != val) {
 469                 sym_clear_all_valid();
 470         }
 471
 472         return true;
 473 }
 474
 475 tristate sym_toggle_tristate_value(struct symbol *sym)
 476 {
 477         tristate oldval, newval;
 478
 479         oldval = newval = sym_get_tristate_value(sym);
 480         do {
 481                 switch (newval) {
 482                 case no:
 483                         newval = mod;
 484                         break;
 485                 case mod:
 486                         newval = yes;
 487                         break;
 488                 case yes:
 489                         newval = no;
 490                         break;
 491                 }
 492                 if (sym_set_tristate_value(sym, newval))
 493                         break;
 494         } while (oldval != newval);
 495         return newval;
 496 }
 497
 498 bool sym_string_valid(struct symbol *sym, const char *str)
 499 {
 500         signed char ch;
 501
 502         switch (sym->type) {
 503         case S_STRING:
 504                 return true;
 505         case S_INT:
 506                 ch = *str++;
 507                 if (ch == '-')
 508                         ch = *str++;
 509                 if (!isdigit(ch))
 510                         return false;
 511                 if (ch == '0' && *str != 0)
 512                         return false;
 513                 while ((ch = *str++)) {
 514                         if (!isdigit(ch))
 515                                 return false;
 516                 }
 517                 return true;
 518         case S_HEX:
 519                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 520                         str += 2;
 521                 ch = *str++;
 522                 do {
 523                         if (!isxdigit(ch))
 524                                 return false;
 525                 } while ((ch = *str++));
 526                 return true;
 527         case S_BOOLEAN:
 528         case S_TRISTATE:
 529                 switch (str[0]) {
 530                 case 'y': case 'Y':
 531                 case 'm': case 'M':
 532                 case 'n': case 'N':
 533                         return true;
 534                 }
 535                 return false;
 536         default:
 537                 return false;
 538         }
 539 }
 540
 541 bool sym_string_within_range(struct symbol *sym, const char *str)
 542 {
 543         struct property *prop;
 544         int val;
 545
 546         switch (sym->type) {
 547         case S_STRING:
 548                 return sym_string_valid(sym, str);
 549         case S_INT:
 550                 if (!sym_string_valid(sym, str))
 551                         return false;
 552                 prop = sym_get_range_prop(sym);
 553                 if (!prop)
 554                         return true;
 555                 val = strtol(str, NULL, 10);
 556                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 557                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 558         case S_HEX:
 559                 if (!sym_string_valid(sym, str))
 560                         return false;
 561                 prop = sym_get_range_prop(sym);
 562                 if (!prop)
 563                         return true;
 564                 val = strtol(str, NULL, 16);
 565                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 566                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 567         case S_BOOLEAN:
 568         case S_TRISTATE:
 569                 switch (str[0]) {
 570                 case 'y': case 'Y':
 571                         return sym_tristate_within_range(sym, yes);
 572                 case 'm': case 'M':
 573                         return sym_tristate_within_range(sym, mod);
 574                 case 'n': case 'N':
 575                         return sym_tristate_within_range(sym, no);
 576                 }
 577                 return false;
 578         default:
 579                 return false;
 580         }
 581 }
 582
 583 bool sym_set_string_value(struct symbol *sym, const char *newval)
 584 {
 585         const char *oldval;
 586         char *val;
 587         int size;
 588
 589         switch (sym->type) {
 590         case S_BOOLEAN:
 591         case S_TRISTATE:
 592                 switch (newval[0]) {
 593                 case 'y': case 'Y':
 594                         return sym_set_tristate_value(sym, yes);
 595                 case 'm': case 'M':
 596                         return sym_set_tristate_value(sym, mod);
 597                 case 'n': case 'N':
 598                         return sym_set_tristate_value(sym, no);
 599                 }
 600                 return false;
 601         default:
 602                 ;
 603         }
 604
 605         if (!sym_string_within_range(sym, newval))
 606                 return false;
 607
 608         if (sym->flags & SYMBOL_NEW) {
 609                 sym->flags &= ~SYMBOL_NEW;
 610                 sym_set_changed(sym);
 611         }
 612
 613         oldval = sym->user.val;
 614         size = strlen(newval) + 1;
 615         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 616                 size += 2;
 617                 sym->user.val = val = malloc(size);
 618                 *val++ = '0';
 619                 *val++ = 'x';
 620         } else if (!oldval || strcmp(oldval, newval))
 621                 sym->user.val = val = malloc(size);
 622         else
 623                 return true;
 624
 625         strcpy(val, newval);
 626         free((void *)oldval);
 627         sym_clear_all_valid();
 628
 629         return true;
 630 }
 631
 632 const char *sym_get_string_value(struct symbol *sym)
 633 {
 634         tristate val;
 635
 636         switch (sym->type) {
 637         case S_BOOLEAN:
 638         case S_TRISTATE:
 639                 val = sym_get_tristate_value(sym);
 640                 switch (val) {
 641                 case no:
 642                         return "n";
 643                 case mod:
 644                         return "m";
 645                 case yes:
 646                         return "y";
 647                 }
 648                 break;
 649         default:
 650                 ;
 651         }
 652         return (const char *)sym->curr.val;
 653 }
 654
 655 bool sym_is_changable(struct symbol *sym)
 656 {
 657         return sym->visible > sym->rev_dep.tri;
 658 }
 659
 660 struct symbol *sym_lookup(const char *name, int isconst)
 661 {
 662         struct symbol *symbol;
 663         const char *ptr;
 664         char *new_name;
 665         int hash = 0;
 666
 667         if (name) {
 668                 if (name[0] && !name[1]) {
 669                         switch (name[0]) {
 670                         case 'y': return &symbol_yes;
 671                         case 'm': return &symbol_mod;
 672                         case 'n': return &symbol_no;
 673                         }
 674                 }
 675                 for (ptr = name; *ptr; ptr++)
 676                         hash += *ptr;
 677                 hash &= 0xff;
 678
 679                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 680                         if (!strcmp(symbol->name, name)) {
 681                                 if ((isconst && symbol->flags & SYMBOL_CONST) ||
 682                                     (!isconst && !(symbol->flags & SYMBOL_CONST)))
 683                                         return symbol;
 684                         }
 685                 }
 686                 new_name = strdup(name);
 687         } else {
 688                 new_name = NULL;
 689                 hash = 256;
 690         }
 691
 692         symbol = malloc(sizeof(*symbol));
 693         memset(symbol, 0, sizeof(*symbol));
 694         symbol->name = new_name;
 695         symbol->type = S_UNKNOWN;
 696         symbol->flags = SYMBOL_NEW;
 697         if (isconst)
 698                 symbol->flags |= SYMBOL_CONST;
 699
 700         symbol->next = symbol_hash[hash];
 701         symbol_hash[hash] = symbol;
 702
 703         return symbol;
 704 }
 705
 706 struct symbol *sym_find(const char *name)
 707 {
 708         struct symbol *symbol = NULL;
 709         const char *ptr;
 710         int hash = 0;
 711
 712         if (!name)
 713                 return NULL;
 714
 715         if (name[0] && !name[1]) {
 716                 switch (name[0]) {
 717                 case 'y': return &symbol_yes;
 718                 case 'm': return &symbol_mod;
 719                 case 'n': return &symbol_no;
 720                 }
 721         }
 722         for (ptr = name; *ptr; ptr++)
 723                 hash += *ptr;
 724         hash &= 0xff;
 725
 726         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 727                 if (!strcmp(symbol->name, name) &&
 728                     !(symbol->flags & SYMBOL_CONST))
 729                                 break;
 730         }
 731
 732         return symbol;
 733 }
 734
 735 struct symbol **sym_re_search(const char *pattern)
 736 {
 737         struct symbol *sym, **sym_arr = NULL;
 738         int i, cnt, size;
 739         regex_t re;
 740
 741         cnt = size = 0;
 742         /* Skip if empty */
 743         if (strlen(pattern) == 0)
 744                 return NULL;
 745         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 746                 return NULL;
 747
 748         for_all_symbols(i, sym) {
 749                 if (sym->flags & SYMBOL_CONST || !sym->name)
 750                         continue;
 751                 if (regexec(&re, sym->name, 0, NULL, 0))
 752                         continue;
 753                 if (cnt + 1 >= size) {
 754                         void *tmp = sym_arr;
 755                         size += 16;
 756                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 757                         if (!sym_arr) {
 758                                 free(tmp);
 759                                 return NULL;
 760                         }
 761                 }
 762                 sym_calc_value(sym);
 763                 sym_arr[cnt++] = sym;
 764         }
 765         if (sym_arr)
 766                 sym_arr[cnt] = NULL;
 767         regfree(&re);
 768
 769         return sym_arr;
 770 }
 771
 772
 773 struct symbol *sym_check_deps(struct symbol *sym);
 774
 775 static struct symbol *sym_check_expr_deps(struct expr *e)
 776 {
 777         struct symbol *sym;
 778
 779         if (!e)
 780                 return NULL;
 781         switch (e->type) {
 782         case E_OR:
 783         case E_AND:
 784                 sym = sym_check_expr_deps(e->left.expr);
 785                 if (sym)
 786                         return sym;
 787                 return sym_check_expr_deps(e->right.expr);
 788         case E_NOT:
 789                 return sym_check_expr_deps(e->left.expr);
 790         case E_EQUAL:
 791         case E_UNEQUAL:
 792                 sym = sym_check_deps(e->left.sym);
 793                 if (sym)
 794                         return sym;
 795                 return sym_check_deps(e->right.sym);
 796         case E_SYMBOL:
 797                 return sym_check_deps(e->left.sym);
 798         default:
 799                 break;
 800         }
 801         printf("Oops! How to check %d?\n", e->type);
 802         return NULL;
 803 }
 804
 805 struct symbol *sym_check_deps(struct symbol *sym)
 806 {
 807         struct symbol *sym2;
 808         struct property *prop;
 809
 810         if (sym->flags & SYMBOL_CHECK) {
 811                 printf("Warning! Found recursive dependency: %s", sym->name);
 812                 return sym;
 813         }
 814         if (sym->flags & SYMBOL_CHECKED)
 815                 return NULL;
 816
 817         sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
 818         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
 819         if (sym2)
 820                 goto out;
 821
 822         for (prop = sym->prop; prop; prop = prop->next) {
 823                 if (prop->type == P_CHOICE || prop->type == P_SELECT || prop->type == P_DESELECT)
 824                         continue;
 825                 sym2 = sym_check_expr_deps(prop->visible.expr);
 826                 if (sym2)
 827                         goto out;
 828                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
 829                         continue;
 830                 sym2 = sym_check_expr_deps(prop->expr);
 831                 if (sym2)
 832                         goto out;
 833         }
 834 out:
 835         if (sym2) {
 836                 printf(" %s", sym->name);
 837                 if (sym2 == sym) {
 838                         printf("\n");
 839                         sym2 = NULL;
 840                 }
 841         }
 842         sym->flags &= ~SYMBOL_CHECK;
 843         return sym2;
 844 }
 845
 846 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
 847 {
 848         struct property *prop;
 849         struct property **propp;
 850
 851         prop = malloc(sizeof(*prop));
 852         memset(prop, 0, sizeof(*prop));
 853         prop->type = type;
 854         prop->sym = sym;
 855         prop->file = current_file;
 856         prop->lineno = zconf_lineno();
 857
 858         /* append property to the prop list of symbol */
 859         if (sym) {
 860                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
 861                         ;
 862                 *propp = prop;
 863         }
 864
 865         return prop;
 866 }
 867
 868 struct symbol *prop_get_symbol(struct property *prop)
 869 {
 870         if (prop->expr && (prop->expr->type == E_SYMBOL ||
 871                            prop->expr->type == E_CHOICE))
 872                 return prop->expr->left.sym;
 873         return NULL;
 874 }
 875
 876 const char *prop_get_type_name(enum prop_type type)
 877 {
 878         switch (type) {
 879         case P_PROMPT:
 880                 return "prompt";
 881         case P_COMMENT:
 882                 return "comment";
 883         case P_MENU:
 884                 return "menu";
 885         case P_DEFAULT:
 886                 return "default";
 887         case P_CHOICE:
 888                 return "choice";
 889         case P_SELECT:
 890                 return "select";
 891         case P_DESELECT:
 892                 return "deselect";
 893         case P_RANGE:
 894                 return "range";
 895         case P_UNKNOWN:
 896                 break;
 897         }
 898         return "unknown";
 899 }