SAFE public projects git trees. - safe/jmp/linux-2.6/blob - scripts/kconfig/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         sym->flags |= SYMBOL_AUTO;
  60         p = getenv("ARCH");
  61         if (p)
  62                 sym_add_default(sym, p);
  63
  64         sym = sym_lookup("KERNELRELEASE", 0);
  65         sym->type = S_STRING;
  66         sym->flags |= SYMBOL_AUTO;
  67         p = getenv("KERNELRELEASE");
  68         if (p)
  69                 sym_add_default(sym, p);
  70
  71         sym = sym_lookup("UNAME_RELEASE", 0);
  72         sym->type = S_STRING;
  73         sym->flags |= SYMBOL_AUTO;
  74         sym_add_default(sym, uts.release);
  75 }
  76
  77 enum symbol_type sym_get_type(struct symbol *sym)
  78 {
  79         enum symbol_type type = sym->type;
  80
  81         if (type == S_TRISTATE) {
  82                 if (sym_is_choice_value(sym) && sym->visible == yes)
  83                         type = S_BOOLEAN;
  84                 else if (modules_val == no)
  85                         type = S_BOOLEAN;
  86         }
  87         return type;
  88 }
  89
  90 const char *sym_type_name(enum symbol_type type)
  91 {
  92         switch (type) {
  93         case S_BOOLEAN:
  94                 return "boolean";
  95         case S_TRISTATE:
  96                 return "tristate";
  97         case S_INT:
  98                 return "integer";
  99         case S_HEX:
 100                 return "hex";
 101         case S_STRING:
 102                 return "string";
 103         case S_UNKNOWN:
 104                 return "unknown";
 105         case S_OTHER:
 106                 break;
 107         }
 108         return "???";
 109 }
 110
 111 struct property *sym_get_choice_prop(struct symbol *sym)
 112 {
 113         struct property *prop;
 114
 115         for_all_choices(sym, prop)
 116                 return prop;
 117         return NULL;
 118 }
 119
 120 struct property *sym_get_default_prop(struct symbol *sym)
 121 {
 122         struct property *prop;
 123
 124         for_all_defaults(sym, prop) {
 125                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 126                 if (prop->visible.tri != no)
 127                         return prop;
 128         }
 129         return NULL;
 130 }
 131
 132 struct property *sym_get_range_prop(struct symbol *sym)
 133 {
 134         struct property *prop;
 135
 136         for_all_properties(sym, prop, P_RANGE) {
 137                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 138                 if (prop->visible.tri != no)
 139                         return prop;
 140         }
 141         return NULL;
 142 }
 143
 144 static void sym_calc_visibility(struct symbol *sym)
 145 {
 146         struct property *prop;
 147         tristate tri;
 148
 149         /* any prompt visible? */
 150         tri = no;
 151         for_all_prompts(sym, prop) {
 152                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 153                 tri = E_OR(tri, prop->visible.tri);
 154         }
 155         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 156                 tri = yes;
 157         if (sym->visible != tri) {
 158                 sym->visible = tri;
 159                 sym_set_changed(sym);
 160         }
 161         if (sym_is_choice_value(sym))
 162                 return;
 163         tri = no;
 164         if (sym->rev_dep.expr)
 165                 tri = expr_calc_value(sym->rev_dep.expr);
 166         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 167                 tri = yes;
 168         if (sym->rev_dep.tri != tri) {
 169                 sym->rev_dep.tri = tri;
 170                 sym_set_changed(sym);
 171         }
 172 }
 173
 174 static struct symbol *sym_calc_choice(struct symbol *sym)
 175 {
 176         struct symbol *def_sym;
 177         struct property *prop;
 178         struct expr *e;
 179
 180         /* is the user choice visible? */
 181         def_sym = sym->user.val;
 182         if (def_sym) {
 183                 sym_calc_visibility(def_sym);
 184                 if (def_sym->visible != no)
 185                         return def_sym;
 186         }
 187
 188         /* any of the defaults visible? */
 189         for_all_defaults(sym, prop) {
 190                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 191                 if (prop->visible.tri == no)
 192                         continue;
 193                 def_sym = prop_get_symbol(prop);
 194                 sym_calc_visibility(def_sym);
 195                 if (def_sym->visible != no)
 196                         return def_sym;
 197         }
 198
 199         /* just get the first visible value */
 200         prop = sym_get_choice_prop(sym);
 201         for (e = prop->expr; e; e = e->left.expr) {
 202                 def_sym = e->right.sym;
 203                 sym_calc_visibility(def_sym);
 204                 if (def_sym->visible != no)
 205                         return def_sym;
 206         }
 207
 208         /* no choice? reset tristate value */
 209         sym->curr.tri = no;
 210         return NULL;
 211 }
 212
 213 void sym_calc_value(struct symbol *sym)
 214 {
 215         struct symbol_value newval, oldval;
 216         struct property *prop;
 217         struct expr *e;
 218
 219         if (!sym)
 220                 return;
 221
 222         if (sym->flags & SYMBOL_VALID)
 223                 return;
 224         sym->flags |= SYMBOL_VALID;
 225
 226         oldval = sym->curr;
 227
 228         switch (sym->type) {
 229         case S_INT:
 230         case S_HEX:
 231         case S_STRING:
 232                 newval = symbol_empty.curr;
 233                 break;
 234         case S_BOOLEAN:
 235         case S_TRISTATE:
 236                 newval = symbol_no.curr;
 237                 break;
 238         default:
 239                 sym->curr.val = sym->name;
 240                 sym->curr.tri = no;
 241                 return;
 242         }
 243         if (!sym_is_choice_value(sym))
 244                 sym->flags &= ~SYMBOL_WRITE;
 245
 246         sym_calc_visibility(sym);
 247
 248         /* set default if recursively called */
 249         sym->curr = newval;
 250
 251         switch (sym_get_type(sym)) {
 252         case S_BOOLEAN:
 253         case S_TRISTATE:
 254                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 255                         prop = sym_get_choice_prop(sym);
 256                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 257                 } else if (E_OR(sym->visible, sym->rev_dep.tri) != no) {
 258                         sym->flags |= SYMBOL_WRITE;
 259                         if (sym_has_value(sym))
 260                                 newval.tri = sym->user.tri;
 261                         else if (!sym_is_choice(sym)) {
 262                                 prop = sym_get_default_prop(sym);
 263                                 if (prop)
 264                                         newval.tri = expr_calc_value(prop->expr);
 265                         }
 266                         newval.tri = E_OR(E_AND(newval.tri, sym->visible), sym->rev_dep.tri);
 267                 } else if (!sym_is_choice(sym)) {
 268                         prop = sym_get_default_prop(sym);
 269                         if (prop) {
 270                                 sym->flags |= SYMBOL_WRITE;
 271                                 newval.tri = expr_calc_value(prop->expr);
 272                         }
 273                 }
 274                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 275                         newval.tri = yes;
 276                 break;
 277         case S_STRING:
 278         case S_HEX:
 279         case S_INT:
 280                 if (sym->visible != no) {
 281                         sym->flags |= SYMBOL_WRITE;
 282                         if (sym_has_value(sym)) {
 283                                 newval.val = sym->user.val;
 284                                 break;
 285                         }
 286                 }
 287                 prop = sym_get_default_prop(sym);
 288                 if (prop) {
 289                         struct symbol *ds = prop_get_symbol(prop);
 290                         if (ds) {
 291                                 sym->flags |= SYMBOL_WRITE;
 292                                 sym_calc_value(ds);
 293                                 newval.val = ds->curr.val;
 294                         }
 295                 }
 296                 break;
 297         default:
 298                 ;
 299         }
 300
 301         sym->curr = newval;
 302         if (sym_is_choice(sym) && newval.tri == yes)
 303                 sym->curr.val = sym_calc_choice(sym);
 304
 305         if (memcmp(&oldval, &sym->curr, sizeof(oldval)))
 306                 sym_set_changed(sym);
 307         if (modules_sym == sym)
 308                 modules_val = modules_sym->curr.tri;
 309
 310         if (sym_is_choice(sym)) {
 311                 int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
 312                 prop = sym_get_choice_prop(sym);
 313                 for (e = prop->expr; e; e = e->left.expr) {
 314                         e->right.sym->flags |= flags;
 315                         if (flags & SYMBOL_CHANGED)
 316                                 sym_set_changed(e->right.sym);
 317                 }
 318         }
 319 }
 320
 321 void sym_clear_all_valid(void)
 322 {
 323         struct symbol *sym;
 324         int i;
 325
 326         for_all_symbols(i, sym)
 327                 sym->flags &= ~SYMBOL_VALID;
 328         sym_change_count++;
 329         if (modules_sym)
 330                 sym_calc_value(modules_sym);
 331 }
 332
 333 void sym_set_changed(struct symbol *sym)
 334 {
 335         struct property *prop;
 336
 337         sym->flags |= SYMBOL_CHANGED;
 338         for (prop = sym->prop; prop; prop = prop->next) {
 339                 if (prop->menu)
 340                         prop->menu->flags |= MENU_CHANGED;
 341         }
 342 }
 343
 344 void sym_set_all_changed(void)
 345 {
 346         struct symbol *sym;
 347         int i;
 348
 349         for_all_symbols(i, sym)
 350                 sym_set_changed(sym);
 351 }
 352
 353 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 354 {
 355         int type = sym_get_type(sym);
 356
 357         if (sym->visible == no)
 358                 return false;
 359
 360         if (type != S_BOOLEAN && type != S_TRISTATE)
 361                 return false;
 362
 363         if (type == S_BOOLEAN && val == mod)
 364                 return false;
 365         if (sym->visible <= sym->rev_dep.tri)
 366                 return false;
 367         if (sym_is_choice_value(sym) && sym->visible == yes)
 368                 return val == yes;
 369         return val >= sym->rev_dep.tri && val <= sym->visible;
 370 }
 371
 372 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 373 {
 374         tristate oldval = sym_get_tristate_value(sym);
 375
 376         if (oldval != val && !sym_tristate_within_range(sym, val))
 377                 return false;
 378
 379         if (sym->flags & SYMBOL_NEW) {
 380                 sym->flags &= ~SYMBOL_NEW;
 381                 sym_set_changed(sym);
 382         }
 383         /*
 384          * setting a choice value also resets the new flag of the choice
 385          * symbol and all other choice values.
 386          */
 387         if (sym_is_choice_value(sym) && val == yes) {
 388                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 389                 struct property *prop;
 390                 struct expr *e;
 391
 392                 cs->user.val = sym;
 393                 cs->flags &= ~SYMBOL_NEW;
 394                 prop = sym_get_choice_prop(cs);
 395                 for (e = prop->expr; e; e = e->left.expr) {
 396                         if (e->right.sym->visible != no)
 397                                 e->right.sym->flags &= ~SYMBOL_NEW;
 398                 }
 399         }
 400
 401         sym->user.tri = val;
 402         if (oldval != val) {
 403                 sym_clear_all_valid();
 404                 if (sym == modules_sym)
 405                         sym_set_all_changed();
 406         }
 407
 408         return true;
 409 }
 410
 411 tristate sym_toggle_tristate_value(struct symbol *sym)
 412 {
 413         tristate oldval, newval;
 414
 415         oldval = newval = sym_get_tristate_value(sym);
 416         do {
 417                 switch (newval) {
 418                 case no:
 419                         newval = mod;
 420                         break;
 421                 case mod:
 422                         newval = yes;
 423                         break;
 424                 case yes:
 425                         newval = no;
 426                         break;
 427                 }
 428                 if (sym_set_tristate_value(sym, newval))
 429                         break;
 430         } while (oldval != newval);
 431         return newval;
 432 }
 433
 434 bool sym_string_valid(struct symbol *sym, const char *str)
 435 {
 436         signed char ch;
 437
 438         switch (sym->type) {
 439         case S_STRING:
 440                 return true;
 441         case S_INT:
 442                 ch = *str++;
 443                 if (ch == '-')
 444                         ch = *str++;
 445                 if (!isdigit(ch))
 446                         return false;
 447                 if (ch == '0' && *str != 0)
 448                         return false;
 449                 while ((ch = *str++)) {
 450                         if (!isdigit(ch))
 451                                 return false;
 452                 }
 453                 return true;
 454         case S_HEX:
 455                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 456                         str += 2;
 457                 ch = *str++;
 458                 do {
 459                         if (!isxdigit(ch))
 460                                 return false;
 461                 } while ((ch = *str++));
 462                 return true;
 463         case S_BOOLEAN:
 464         case S_TRISTATE:
 465                 switch (str[0]) {
 466                 case 'y': case 'Y':
 467                 case 'm': case 'M':
 468                 case 'n': case 'N':
 469                         return true;
 470                 }
 471                 return false;
 472         default:
 473                 return false;
 474         }
 475 }
 476
 477 bool sym_string_within_range(struct symbol *sym, const char *str)
 478 {
 479         struct property *prop;
 480         int val;
 481
 482         switch (sym->type) {
 483         case S_STRING:
 484                 return sym_string_valid(sym, str);
 485         case S_INT:
 486                 if (!sym_string_valid(sym, str))
 487                         return false;
 488                 prop = sym_get_range_prop(sym);
 489                 if (!prop)
 490                         return true;
 491                 val = strtol(str, NULL, 10);
 492                 return val >= strtol(prop->expr->left.sym->name, NULL, 10) &&
 493                        val <= strtol(prop->expr->right.sym->name, NULL, 10);
 494         case S_HEX:
 495                 if (!sym_string_valid(sym, str))
 496                         return false;
 497                 prop = sym_get_range_prop(sym);
 498                 if (!prop)
 499                         return true;
 500                 val = strtol(str, NULL, 16);
 501                 return val >= strtol(prop->expr->left.sym->name, NULL, 16) &&
 502                        val <= strtol(prop->expr->right.sym->name, NULL, 16);
 503         case S_BOOLEAN:
 504         case S_TRISTATE:
 505                 switch (str[0]) {
 506                 case 'y': case 'Y':
 507                         return sym_tristate_within_range(sym, yes);
 508                 case 'm': case 'M':
 509                         return sym_tristate_within_range(sym, mod);
 510                 case 'n': case 'N':
 511                         return sym_tristate_within_range(sym, no);
 512                 }
 513                 return false;
 514         default:
 515                 return false;
 516         }
 517 }
 518
 519 bool sym_set_string_value(struct symbol *sym, const char *newval)
 520 {
 521         const char *oldval;
 522         char *val;
 523         int size;
 524
 525         switch (sym->type) {
 526         case S_BOOLEAN:
 527         case S_TRISTATE:
 528                 switch (newval[0]) {
 529                 case 'y': case 'Y':
 530                         return sym_set_tristate_value(sym, yes);
 531                 case 'm': case 'M':
 532                         return sym_set_tristate_value(sym, mod);
 533                 case 'n': case 'N':
 534                         return sym_set_tristate_value(sym, no);
 535                 }
 536                 return false;
 537         default:
 538                 ;
 539         }
 540
 541         if (!sym_string_within_range(sym, newval))
 542                 return false;
 543
 544         if (sym->flags & SYMBOL_NEW) {
 545                 sym->flags &= ~SYMBOL_NEW;
 546                 sym_set_changed(sym);
 547         }
 548
 549         oldval = sym->user.val;
 550         size = strlen(newval) + 1;
 551         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 552                 size += 2;
 553                 sym->user.val = val = malloc(size);
 554                 *val++ = '0';
 555                 *val++ = 'x';
 556         } else if (!oldval || strcmp(oldval, newval))
 557                 sym->user.val = val = malloc(size);
 558         else
 559                 return true;
 560
 561         strcpy(val, newval);
 562         free((void *)oldval);
 563         sym_clear_all_valid();
 564
 565         return true;
 566 }
 567
 568 const char *sym_get_string_value(struct symbol *sym)
 569 {
 570         tristate val;
 571
 572         switch (sym->type) {
 573         case S_BOOLEAN:
 574         case S_TRISTATE:
 575                 val = sym_get_tristate_value(sym);
 576                 switch (val) {
 577                 case no:
 578                         return "n";
 579                 case mod:
 580                         return "m";
 581                 case yes:
 582                         return "y";
 583                 }
 584                 break;
 585         default:
 586                 ;
 587         }
 588         return (const char *)sym->curr.val;
 589 }
 590
 591 bool sym_is_changable(struct symbol *sym)
 592 {
 593         return sym->visible > sym->rev_dep.tri;
 594 }
 595
 596 struct symbol *sym_lookup(const char *name, int isconst)
 597 {
 598         struct symbol *symbol;
 599         const char *ptr;
 600         char *new_name;
 601         int hash = 0;
 602
 603         if (name) {
 604                 if (name[0] && !name[1]) {
 605                         switch (name[0]) {
 606                         case 'y': return &symbol_yes;
 607                         case 'm': return &symbol_mod;
 608                         case 'n': return &symbol_no;
 609                         }
 610                 }
 611                 for (ptr = name; *ptr; ptr++)
 612                         hash += *ptr;
 613                 hash &= 0xff;
 614
 615                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 616                         if (!strcmp(symbol->name, name)) {
 617                                 if ((isconst && symbol->flags & SYMBOL_CONST) ||
 618                                     (!isconst && !(symbol->flags & SYMBOL_CONST)))
 619                                         return symbol;
 620                         }
 621                 }
 622                 new_name = strdup(name);
 623         } else {
 624                 new_name = NULL;
 625                 hash = 256;
 626         }
 627
 628         symbol = malloc(sizeof(*symbol));
 629         memset(symbol, 0, sizeof(*symbol));
 630         symbol->name = new_name;
 631         symbol->type = S_UNKNOWN;
 632         symbol->flags = SYMBOL_NEW;
 633         if (isconst)
 634                 symbol->flags |= SYMBOL_CONST;
 635
 636         symbol->next = symbol_hash[hash];
 637         symbol_hash[hash] = symbol;
 638
 639         return symbol;
 640 }
 641
 642 struct symbol *sym_find(const char *name)
 643 {
 644         struct symbol *symbol = NULL;
 645         const char *ptr;
 646         int hash = 0;
 647
 648         if (!name)
 649                 return NULL;
 650
 651         if (name[0] && !name[1]) {
 652                 switch (name[0]) {
 653                 case 'y': return &symbol_yes;
 654                 case 'm': return &symbol_mod;
 655                 case 'n': return &symbol_no;
 656                 }
 657         }
 658         for (ptr = name; *ptr; ptr++)
 659                 hash += *ptr;
 660         hash &= 0xff;
 661
 662         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 663                 if (!strcmp(symbol->name, name) &&
 664                     !(symbol->flags & SYMBOL_CONST))
 665                                 break;
 666         }
 667
 668         return symbol;
 669 }
 670
 671 struct symbol **sym_re_search(const char *pattern)
 672 {
 673         struct symbol *sym, **sym_arr = NULL;
 674         int i, cnt, size;
 675         regex_t re;
 676
 677         cnt = size = 0;
 678         /* Skip if empty */
 679         if (strlen(pattern) == 0)
 680                 return NULL;
 681         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 682                 return NULL;
 683
 684         for_all_symbols(i, sym) {
 685                 if (sym->flags & SYMBOL_CONST || !sym->name)
 686                         continue;
 687                 if (regexec(&re, sym->name, 0, NULL, 0))
 688                         continue;
 689                 if (cnt + 1 >= size) {
 690                         void *tmp = sym_arr;
 691                         size += 16;
 692                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 693                         if (!sym_arr) {
 694                                 free(tmp);
 695                                 return NULL;
 696                         }
 697                 }
 698                 sym_arr[cnt++] = sym;
 699         }
 700         if (sym_arr)
 701                 sym_arr[cnt] = NULL;
 702         regfree(&re);
 703
 704         return sym_arr;
 705 }
 706
 707
 708 struct symbol *sym_check_deps(struct symbol *sym);
 709
 710 static struct symbol *sym_check_expr_deps(struct expr *e)
 711 {
 712         struct symbol *sym;
 713
 714         if (!e)
 715                 return NULL;
 716         switch (e->type) {
 717         case E_OR:
 718         case E_AND:
 719                 sym = sym_check_expr_deps(e->left.expr);
 720                 if (sym)
 721                         return sym;
 722                 return sym_check_expr_deps(e->right.expr);
 723         case E_NOT:
 724                 return sym_check_expr_deps(e->left.expr);
 725         case E_EQUAL:
 726         case E_UNEQUAL:
 727                 sym = sym_check_deps(e->left.sym);
 728                 if (sym)
 729                         return sym;
 730                 return sym_check_deps(e->right.sym);
 731         case E_SYMBOL:
 732                 return sym_check_deps(e->left.sym);
 733         default:
 734                 break;
 735         }
 736         printf("Oops! How to check %d?\n", e->type);
 737         return NULL;
 738 }
 739
 740 struct symbol *sym_check_deps(struct symbol *sym)
 741 {
 742         struct symbol *sym2;
 743         struct property *prop;
 744
 745         if (sym->flags & SYMBOL_CHECK) {
 746                 printf("Warning! Found recursive dependency: %s", sym->name);
 747                 return sym;
 748         }
 749         if (sym->flags & SYMBOL_CHECKED)
 750                 return NULL;
 751
 752         sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
 753         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
 754         if (sym2)
 755                 goto out;
 756
 757         for (prop = sym->prop; prop; prop = prop->next) {
 758                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
 759                         continue;
 760                 sym2 = sym_check_expr_deps(prop->visible.expr);
 761                 if (sym2)
 762                         goto out;
 763                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
 764                         continue;
 765                 sym2 = sym_check_expr_deps(prop->expr);
 766                 if (sym2)
 767                         goto out;
 768         }
 769 out:
 770         if (sym2) {
 771                 printf(" %s", sym->name);
 772                 if (sym2 == sym) {
 773                         printf("\n");
 774                         sym2 = NULL;
 775                 }
 776         }
 777         sym->flags &= ~SYMBOL_CHECK;
 778         return sym2;
 779 }
 780
 781 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
 782 {
 783         struct property *prop;
 784         struct property **propp;
 785
 786         prop = malloc(sizeof(*prop));
 787         memset(prop, 0, sizeof(*prop));
 788         prop->type = type;
 789         prop->sym = sym;
 790         prop->file = current_file;
 791         prop->lineno = zconf_lineno();
 792
 793         /* append property to the prop list of symbol */
 794         if (sym) {
 795                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
 796                         ;
 797                 *propp = prop;
 798         }
 799
 800         return prop;
 801 }
 802
 803 struct symbol *prop_get_symbol(struct property *prop)
 804 {
 805         if (prop->expr && (prop->expr->type == E_SYMBOL ||
 806                            prop->expr->type == E_CHOICE))
 807                 return prop->expr->left.sym;
 808         return NULL;
 809 }
 810
 811 const char *prop_get_type_name(enum prop_type type)
 812 {
 813         switch (type) {
 814         case P_PROMPT:
 815                 return "prompt";
 816         case P_COMMENT:
 817                 return "comment";
 818         case P_MENU:
 819                 return "menu";
 820         case P_DEFAULT:
 821                 return "default";
 822         case P_CHOICE:
 823                 return "choice";
 824         case P_SELECT:
 825                 return "select";
 826         case P_RANGE:
 827                 return "range";
 828         case P_UNKNOWN:
 829                 break;
 830         }
 831         return "unknown";
 832 }