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_CONST|SYMBOL_VALID,
  19 }, symbol_mod = {
  20         .name = "m",
  21         .curr = { "m", mod },
  22         .flags = SYMBOL_CONST|SYMBOL_VALID,
  23 }, symbol_no = {
  24         .name = "n",
  25         .curr = { "n", no },
  26         .flags = SYMBOL_CONST|SYMBOL_VALID,
  27 }, symbol_empty = {
  28         .name = "",
  29         .curr = { "", no },
  30         .flags = SYMBOL_VALID,
  31 };
  32
  33 struct symbol *sym_defconfig_list;
  34 struct symbol *modules_sym;
  35 tristate modules_val;
  36
  37 struct expr *sym_env_list;
  38
  39 void sym_add_default(struct symbol *sym, const char *def)
  40 {
  41         struct property *prop = prop_alloc(P_DEFAULT, sym);
  42
  43         prop->expr = expr_alloc_symbol(sym_lookup(def, 1));
  44 }
  45
  46 void sym_init(void)
  47 {
  48         struct symbol *sym;
  49         struct utsname uts;
  50         static bool inited = false;
  51
  52         if (inited)
  53                 return;
  54         inited = true;
  55
  56         uname(&uts);
  57
  58         sym = sym_lookup("UNAME_RELEASE", 0);
  59         sym->type = S_STRING;
  60         sym->flags |= SYMBOL_AUTO;
  61         sym_add_default(sym, uts.release);
  62 }
  63
  64 enum symbol_type sym_get_type(struct symbol *sym)
  65 {
  66         enum symbol_type type = sym->type;
  67
  68         if (type == S_TRISTATE) {
  69                 if (sym_is_choice_value(sym) && sym->visible == yes)
  70                         type = S_BOOLEAN;
  71                 else if (modules_val == no)
  72                         type = S_BOOLEAN;
  73         }
  74         return type;
  75 }
  76
  77 const char *sym_type_name(enum symbol_type type)
  78 {
  79         switch (type) {
  80         case S_BOOLEAN:
  81                 return "boolean";
  82         case S_TRISTATE:
  83                 return "tristate";
  84         case S_INT:
  85                 return "integer";
  86         case S_HEX:
  87                 return "hex";
  88         case S_STRING:
  89                 return "string";
  90         case S_UNKNOWN:
  91                 return "unknown";
  92         case S_OTHER:
  93                 break;
  94         }
  95         return "???";
  96 }
  97
  98 struct property *sym_get_choice_prop(struct symbol *sym)
  99 {
 100         struct property *prop;
 101
 102         for_all_choices(sym, prop)
 103                 return prop;
 104         return NULL;
 105 }
 106
 107 struct property *sym_get_env_prop(struct symbol *sym)
 108 {
 109         struct property *prop;
 110
 111         for_all_properties(sym, prop, P_ENV)
 112                 return prop;
 113         return NULL;
 114 }
 115
 116 struct property *sym_get_default_prop(struct symbol *sym)
 117 {
 118         struct property *prop;
 119
 120         for_all_defaults(sym, prop) {
 121                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 122                 if (prop->visible.tri != no)
 123                         return prop;
 124         }
 125         return NULL;
 126 }
 127
 128 struct property *sym_get_range_prop(struct symbol *sym)
 129 {
 130         struct property *prop;
 131
 132         for_all_properties(sym, prop, P_RANGE) {
 133                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 134                 if (prop->visible.tri != no)
 135                         return prop;
 136         }
 137         return NULL;
 138 }
 139
 140 static int sym_get_range_val(struct symbol *sym, int base)
 141 {
 142         sym_calc_value(sym);
 143         switch (sym->type) {
 144         case S_INT:
 145                 base = 10;
 146                 break;
 147         case S_HEX:
 148                 base = 16;
 149                 break;
 150         default:
 151                 break;
 152         }
 153         return strtol(sym->curr.val, NULL, base);
 154 }
 155
 156 static void sym_validate_range(struct symbol *sym)
 157 {
 158         struct property *prop;
 159         int base, val, val2;
 160         char str[64];
 161
 162         switch (sym->type) {
 163         case S_INT:
 164                 base = 10;
 165                 break;
 166         case S_HEX:
 167                 base = 16;
 168                 break;
 169         default:
 170                 return;
 171         }
 172         prop = sym_get_range_prop(sym);
 173         if (!prop)
 174                 return;
 175         val = strtol(sym->curr.val, NULL, base);
 176         val2 = sym_get_range_val(prop->expr->left.sym, base);
 177         if (val >= val2) {
 178                 val2 = sym_get_range_val(prop->expr->right.sym, base);
 179                 if (val <= val2)
 180                         return;
 181         }
 182         if (sym->type == S_INT)
 183                 sprintf(str, "%d", val2);
 184         else
 185                 sprintf(str, "0x%x", val2);
 186         sym->curr.val = strdup(str);
 187 }
 188
 189 static void sym_calc_visibility(struct symbol *sym)
 190 {
 191         struct property *prop;
 192         tristate tri;
 193
 194         /* any prompt visible? */
 195         tri = no;
 196         for_all_prompts(sym, prop) {
 197                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 198                 tri = EXPR_OR(tri, prop->visible.tri);
 199         }
 200         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 201                 tri = yes;
 202         if (sym->visible != tri) {
 203                 sym->visible = tri;
 204                 sym_set_changed(sym);
 205         }
 206         if (sym_is_choice_value(sym))
 207                 return;
 208         tri = no;
 209         if (sym->rev_dep.expr)
 210                 tri = expr_calc_value(sym->rev_dep.expr);
 211         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 212                 tri = yes;
 213         if (sym->rev_dep.tri != tri) {
 214                 sym->rev_dep.tri = tri;
 215                 sym_set_changed(sym);
 216         }
 217 }
 218
 219 static struct symbol *sym_calc_choice(struct symbol *sym)
 220 {
 221         struct symbol *def_sym;
 222         struct property *prop;
 223         struct expr *e;
 224
 225         /* is the user choice visible? */
 226         def_sym = sym->def[S_DEF_USER].val;
 227         if (def_sym) {
 228                 sym_calc_visibility(def_sym);
 229                 if (def_sym->visible != no)
 230                         return def_sym;
 231         }
 232
 233         /* any of the defaults visible? */
 234         for_all_defaults(sym, prop) {
 235                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 236                 if (prop->visible.tri == no)
 237                         continue;
 238                 def_sym = prop_get_symbol(prop);
 239                 sym_calc_visibility(def_sym);
 240                 if (def_sym->visible != no)
 241                         return def_sym;
 242         }
 243
 244         /* just get the first visible value */
 245         prop = sym_get_choice_prop(sym);
 246         expr_list_for_each_sym(prop->expr, e, def_sym) {
 247                 sym_calc_visibility(def_sym);
 248                 if (def_sym->visible != no)
 249                         return def_sym;
 250         }
 251
 252         /* no choice? reset tristate value */
 253         sym->curr.tri = no;
 254         return NULL;
 255 }
 256
 257 void sym_calc_value(struct symbol *sym)
 258 {
 259         struct symbol_value newval, oldval;
 260         struct property *prop;
 261         struct expr *e;
 262
 263         if (!sym)
 264                 return;
 265
 266         if (sym->flags & SYMBOL_VALID)
 267                 return;
 268         sym->flags |= SYMBOL_VALID;
 269
 270         oldval = sym->curr;
 271
 272         switch (sym->type) {
 273         case S_INT:
 274         case S_HEX:
 275         case S_STRING:
 276                 newval = symbol_empty.curr;
 277                 break;
 278         case S_BOOLEAN:
 279         case S_TRISTATE:
 280                 newval = symbol_no.curr;
 281                 break;
 282         default:
 283                 sym->curr.val = sym->name;
 284                 sym->curr.tri = no;
 285                 return;
 286         }
 287         if (!sym_is_choice_value(sym))
 288                 sym->flags &= ~SYMBOL_WRITE;
 289
 290         sym_calc_visibility(sym);
 291
 292         /* set default if recursively called */
 293         sym->curr = newval;
 294
 295         switch (sym_get_type(sym)) {
 296         case S_BOOLEAN:
 297         case S_TRISTATE:
 298                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 299                         prop = sym_get_choice_prop(sym);
 300                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 301 <<<<<<< HEAD:scripts/kconfig/symbol.c
 302                 } else if (EXPR_OR(sym->visible, sym->rev_dep.tri) != no) {
 303                         sym->flags |= SYMBOL_WRITE;
 304                         if (sym_has_value(sym))
 305                                 newval.tri = sym->def[S_DEF_USER].tri;
 306                         else if (!sym_is_choice(sym)) {
 307                                 prop = sym_get_default_prop(sym);
 308                                 if (prop)
 309                                         newval.tri = expr_calc_value(prop->expr);
 310 =======
 311                 } else {
 312                         if (sym->visible != no) {
 313                                 /* if the symbol is visible use the user value
 314                                  * if available, otherwise try the default value
 315                                  */
 316                                 sym->flags |= SYMBOL_WRITE;
 317                                 if (sym_has_value(sym)) {
 318                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 319                                                               sym->visible);
 320                                         goto calc_newval;
 321                                 }
 322 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:scripts/kconfig/symbol.c
 323                         }
 324 <<<<<<< HEAD:scripts/kconfig/symbol.c
 325                         newval.tri = EXPR_OR(EXPR_AND(newval.tri, sym->visible), sym->rev_dep.tri);
 326                 } else if (!sym_is_choice(sym)) {
 327                         prop = sym_get_default_prop(sym);
 328                         if (prop) {
 329 =======
 330                         if (sym->rev_dep.tri != no)
 331 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:scripts/kconfig/symbol.c
 332                                 sym->flags |= SYMBOL_WRITE;
 333 <<<<<<< HEAD:scripts/kconfig/symbol.c
 334                                 newval.tri = expr_calc_value(prop->expr);
 335 =======
 336                         if (!sym_is_choice(sym)) {
 337                                 prop = sym_get_default_prop(sym);
 338                                 if (prop) {
 339                                         sym->flags |= SYMBOL_WRITE;
 340                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 341                                                               prop->visible.tri);
 342                                 }
 343 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:scripts/kconfig/symbol.c
 344                         }
 345 <<<<<<< HEAD:scripts/kconfig/symbol.c
 346 =======
 347                 calc_newval:
 348                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 349 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:scripts/kconfig/symbol.c
 350                 }
 351                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 352                         newval.tri = yes;
 353                 break;
 354         case S_STRING:
 355         case S_HEX:
 356         case S_INT:
 357                 if (sym->visible != no) {
 358                         sym->flags |= SYMBOL_WRITE;
 359                         if (sym_has_value(sym)) {
 360                                 newval.val = sym->def[S_DEF_USER].val;
 361                                 break;
 362                         }
 363                 }
 364                 prop = sym_get_default_prop(sym);
 365                 if (prop) {
 366                         struct symbol *ds = prop_get_symbol(prop);
 367                         if (ds) {
 368                                 sym->flags |= SYMBOL_WRITE;
 369                                 sym_calc_value(ds);
 370                                 newval.val = ds->curr.val;
 371                         }
 372                 }
 373                 break;
 374         default:
 375                 ;
 376         }
 377
 378         if (sym->flags & SYMBOL_AUTO)
 379                 sym->flags &= ~SYMBOL_WRITE;
 380
 381         sym->curr = newval;
 382         if (sym_is_choice(sym) && newval.tri == yes)
 383                 sym->curr.val = sym_calc_choice(sym);
 384         sym_validate_range(sym);
 385
 386         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 387                 sym_set_changed(sym);
 388                 if (modules_sym == sym) {
 389                         sym_set_all_changed();
 390                         modules_val = modules_sym->curr.tri;
 391                 }
 392         }
 393
 394         if (sym_is_choice(sym)) {
 395                 struct symbol *choice_sym;
 396                 int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
 397
 398                 prop = sym_get_choice_prop(sym);
 399                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 400                         choice_sym->flags |= flags;
 401                         if (flags & SYMBOL_CHANGED)
 402                                 sym_set_changed(choice_sym);
 403                 }
 404         }
 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_add_change_count(1);
 415         if (modules_sym)
 416                 sym_calc_value(modules_sym);
 417 }
 418
 419 void sym_set_changed(struct symbol *sym)
 420 {
 421         struct property *prop;
 422
 423         sym->flags |= SYMBOL_CHANGED;
 424         for (prop = sym->prop; prop; prop = prop->next) {
 425                 if (prop->menu)
 426                         prop->menu->flags |= MENU_CHANGED;
 427         }
 428 }
 429
 430 void sym_set_all_changed(void)
 431 {
 432         struct symbol *sym;
 433         int i;
 434
 435         for_all_symbols(i, sym)
 436                 sym_set_changed(sym);
 437 }
 438
 439 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 440 {
 441         int type = sym_get_type(sym);
 442
 443         if (sym->visible == no)
 444                 return false;
 445
 446         if (type != S_BOOLEAN && type != S_TRISTATE)
 447                 return false;
 448
 449         if (type == S_BOOLEAN && val == mod)
 450                 return false;
 451         if (sym->visible <= sym->rev_dep.tri)
 452                 return false;
 453         if (sym_is_choice_value(sym) && sym->visible == yes)
 454                 return val == yes;
 455         return val >= sym->rev_dep.tri && val <= sym->visible;
 456 }
 457
 458 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 459 {
 460         tristate oldval = sym_get_tristate_value(sym);
 461
 462         if (oldval != val && !sym_tristate_within_range(sym, val))
 463                 return false;
 464
 465         if (!(sym->flags & SYMBOL_DEF_USER)) {
 466                 sym->flags |= SYMBOL_DEF_USER;
 467                 sym_set_changed(sym);
 468         }
 469         /*
 470          * setting a choice value also resets the new flag of the choice
 471          * symbol and all other choice values.
 472          */
 473         if (sym_is_choice_value(sym) && val == yes) {
 474                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 475                 struct property *prop;
 476                 struct expr *e;
 477
 478                 cs->def[S_DEF_USER].val = sym;
 479                 cs->flags |= SYMBOL_DEF_USER;
 480                 prop = sym_get_choice_prop(cs);
 481                 for (e = prop->expr; e; e = e->left.expr) {
 482                         if (e->right.sym->visible != no)
 483                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 484                 }
 485         }
 486
 487         sym->def[S_DEF_USER].tri = val;
 488         if (oldval != val)
 489                 sym_clear_all_valid();
 490
 491         return true;
 492 }
 493
 494 tristate sym_toggle_tristate_value(struct symbol *sym)
 495 {
 496         tristate oldval, newval;
 497
 498         oldval = newval = sym_get_tristate_value(sym);
 499         do {
 500                 switch (newval) {
 501                 case no:
 502                         newval = mod;
 503                         break;
 504                 case mod:
 505                         newval = yes;
 506                         break;
 507                 case yes:
 508                         newval = no;
 509                         break;
 510                 }
 511                 if (sym_set_tristate_value(sym, newval))
 512                         break;
 513         } while (oldval != newval);
 514         return newval;
 515 }
 516
 517 bool sym_string_valid(struct symbol *sym, const char *str)
 518 {
 519         signed char ch;
 520
 521         switch (sym->type) {
 522         case S_STRING:
 523                 return true;
 524         case S_INT:
 525                 ch = *str++;
 526                 if (ch == '-')
 527                         ch = *str++;
 528                 if (!isdigit(ch))
 529                         return false;
 530                 if (ch == '0' && *str != 0)
 531                         return false;
 532                 while ((ch = *str++)) {
 533                         if (!isdigit(ch))
 534                                 return false;
 535                 }
 536                 return true;
 537         case S_HEX:
 538                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 539                         str += 2;
 540                 ch = *str++;
 541                 do {
 542                         if (!isxdigit(ch))
 543                                 return false;
 544                 } while ((ch = *str++));
 545                 return true;
 546         case S_BOOLEAN:
 547         case S_TRISTATE:
 548                 switch (str[0]) {
 549                 case 'y': case 'Y':
 550                 case 'm': case 'M':
 551                 case 'n': case 'N':
 552                         return true;
 553                 }
 554                 return false;
 555         default:
 556                 return false;
 557         }
 558 }
 559
 560 bool sym_string_within_range(struct symbol *sym, const char *str)
 561 {
 562         struct property *prop;
 563         int val;
 564
 565         switch (sym->type) {
 566         case S_STRING:
 567                 return sym_string_valid(sym, str);
 568         case S_INT:
 569                 if (!sym_string_valid(sym, str))
 570                         return false;
 571                 prop = sym_get_range_prop(sym);
 572                 if (!prop)
 573                         return true;
 574                 val = strtol(str, NULL, 10);
 575                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 576                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 577         case S_HEX:
 578                 if (!sym_string_valid(sym, str))
 579                         return false;
 580                 prop = sym_get_range_prop(sym);
 581                 if (!prop)
 582                         return true;
 583                 val = strtol(str, NULL, 16);
 584                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 585                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 586         case S_BOOLEAN:
 587         case S_TRISTATE:
 588                 switch (str[0]) {
 589                 case 'y': case 'Y':
 590                         return sym_tristate_within_range(sym, yes);
 591                 case 'm': case 'M':
 592                         return sym_tristate_within_range(sym, mod);
 593                 case 'n': case 'N':
 594                         return sym_tristate_within_range(sym, no);
 595                 }
 596                 return false;
 597         default:
 598                 return false;
 599         }
 600 }
 601
 602 bool sym_set_string_value(struct symbol *sym, const char *newval)
 603 {
 604         const char *oldval;
 605         char *val;
 606         int size;
 607
 608         switch (sym->type) {
 609         case S_BOOLEAN:
 610         case S_TRISTATE:
 611                 switch (newval[0]) {
 612                 case 'y': case 'Y':
 613                         return sym_set_tristate_value(sym, yes);
 614                 case 'm': case 'M':
 615                         return sym_set_tristate_value(sym, mod);
 616                 case 'n': case 'N':
 617                         return sym_set_tristate_value(sym, no);
 618                 }
 619                 return false;
 620         default:
 621                 ;
 622         }
 623
 624         if (!sym_string_within_range(sym, newval))
 625                 return false;
 626
 627         if (!(sym->flags & SYMBOL_DEF_USER)) {
 628                 sym->flags |= SYMBOL_DEF_USER;
 629                 sym_set_changed(sym);
 630         }
 631
 632         oldval = sym->def[S_DEF_USER].val;
 633         size = strlen(newval) + 1;
 634         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 635                 size += 2;
 636                 sym->def[S_DEF_USER].val = val = malloc(size);
 637                 *val++ = '0';
 638                 *val++ = 'x';
 639         } else if (!oldval || strcmp(oldval, newval))
 640                 sym->def[S_DEF_USER].val = val = malloc(size);
 641         else
 642                 return true;
 643
 644         strcpy(val, newval);
 645         free((void *)oldval);
 646         sym_clear_all_valid();
 647
 648         return true;
 649 }
 650
 651 const char *sym_get_string_value(struct symbol *sym)
 652 {
 653         tristate val;
 654
 655         switch (sym->type) {
 656         case S_BOOLEAN:
 657         case S_TRISTATE:
 658                 val = sym_get_tristate_value(sym);
 659                 switch (val) {
 660                 case no:
 661                         return "n";
 662                 case mod:
 663                         return "m";
 664                 case yes:
 665                         return "y";
 666                 }
 667                 break;
 668         default:
 669                 ;
 670         }
 671         return (const char *)sym->curr.val;
 672 }
 673
 674 bool sym_is_changable(struct symbol *sym)
 675 {
 676         return sym->visible > sym->rev_dep.tri;
 677 }
 678
 679 struct symbol *sym_lookup(const char *name, int isconst)
 680 {
 681         struct symbol *symbol;
 682         const char *ptr;
 683         char *new_name;
 684         int hash = 0;
 685
 686         if (name) {
 687                 if (name[0] && !name[1]) {
 688                         switch (name[0]) {
 689                         case 'y': return &symbol_yes;
 690                         case 'm': return &symbol_mod;
 691                         case 'n': return &symbol_no;
 692                         }
 693                 }
 694                 for (ptr = name; *ptr; ptr++)
 695                         hash += *ptr;
 696                 hash &= 0xff;
 697
 698                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 699                         if (!strcmp(symbol->name, name)) {
 700                                 if ((isconst && symbol->flags & SYMBOL_CONST) ||
 701                                     (!isconst && !(symbol->flags & SYMBOL_CONST)))
 702                                         return symbol;
 703                         }
 704                 }
 705                 new_name = strdup(name);
 706         } else {
 707                 new_name = NULL;
 708                 hash = 256;
 709         }
 710
 711         symbol = malloc(sizeof(*symbol));
 712         memset(symbol, 0, sizeof(*symbol));
 713         symbol->name = new_name;
 714         symbol->type = S_UNKNOWN;
 715         if (isconst)
 716                 symbol->flags |= SYMBOL_CONST;
 717
 718         symbol->next = symbol_hash[hash];
 719         symbol_hash[hash] = symbol;
 720
 721         return symbol;
 722 }
 723
 724 struct symbol *sym_find(const char *name)
 725 {
 726         struct symbol *symbol = NULL;
 727         const char *ptr;
 728         int hash = 0;
 729
 730         if (!name)
 731                 return NULL;
 732
 733         if (name[0] && !name[1]) {
 734                 switch (name[0]) {
 735                 case 'y': return &symbol_yes;
 736                 case 'm': return &symbol_mod;
 737                 case 'n': return &symbol_no;
 738                 }
 739         }
 740         for (ptr = name; *ptr; ptr++)
 741                 hash += *ptr;
 742         hash &= 0xff;
 743
 744         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 745                 if (!strcmp(symbol->name, name) &&
 746                     !(symbol->flags & SYMBOL_CONST))
 747                                 break;
 748         }
 749
 750         return symbol;
 751 }
 752
 753 struct symbol **sym_re_search(const char *pattern)
 754 {
 755         struct symbol *sym, **sym_arr = NULL;
 756         int i, cnt, size;
 757         regex_t re;
 758
 759         cnt = size = 0;
 760         /* Skip if empty */
 761         if (strlen(pattern) == 0)
 762                 return NULL;
 763         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 764                 return NULL;
 765
 766         for_all_symbols(i, sym) {
 767                 if (sym->flags & SYMBOL_CONST || !sym->name)
 768                         continue;
 769                 if (regexec(&re, sym->name, 0, NULL, 0))
 770                         continue;
 771                 if (cnt + 1 >= size) {
 772                         void *tmp = sym_arr;
 773                         size += 16;
 774                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 775                         if (!sym_arr) {
 776                                 free(tmp);
 777                                 return NULL;
 778                         }
 779                 }
 780                 sym_arr[cnt++] = sym;
 781         }
 782         if (sym_arr)
 783                 sym_arr[cnt] = NULL;
 784         regfree(&re);
 785
 786         return sym_arr;
 787 }
 788
 789
 790 struct symbol *sym_check_deps(struct symbol *sym);
 791
 792 static struct symbol *sym_check_expr_deps(struct expr *e)
 793 {
 794         struct symbol *sym;
 795
 796         if (!e)
 797                 return NULL;
 798         switch (e->type) {
 799         case E_OR:
 800         case E_AND:
 801                 sym = sym_check_expr_deps(e->left.expr);
 802                 if (sym)
 803                         return sym;
 804                 return sym_check_expr_deps(e->right.expr);
 805         case E_NOT:
 806                 return sym_check_expr_deps(e->left.expr);
 807         case E_EQUAL:
 808         case E_UNEQUAL:
 809                 sym = sym_check_deps(e->left.sym);
 810                 if (sym)
 811                         return sym;
 812                 return sym_check_deps(e->right.sym);
 813         case E_SYMBOL:
 814                 return sym_check_deps(e->left.sym);
 815         default:
 816                 break;
 817         }
 818         printf("Oops! How to check %d?\n", e->type);
 819         return NULL;
 820 }
 821
 822 /* return NULL when dependencies are OK */
 823 struct symbol *sym_check_deps(struct symbol *sym)
 824 {
 825         struct symbol *sym2;
 826         struct property *prop;
 827
 828         if (sym->flags & SYMBOL_CHECK) {
 829                 fprintf(stderr, "%s:%d:error: found recursive dependency: %s",
 830                         sym->prop->file->name, sym->prop->lineno, sym->name);
 831                 return sym;
 832         }
 833         if (sym->flags & SYMBOL_CHECKED)
 834                 return NULL;
 835
 836         sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
 837         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
 838         if (sym2)
 839                 goto out;
 840
 841         for (prop = sym->prop; prop; prop = prop->next) {
 842                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
 843                         continue;
 844                 sym2 = sym_check_expr_deps(prop->visible.expr);
 845                 if (sym2)
 846                         goto out;
 847                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
 848                         continue;
 849                 sym2 = sym_check_expr_deps(prop->expr);
 850                 if (sym2)
 851                         goto out;
 852         }
 853 out:
 854         if (sym2)
 855                 fprintf(stderr, " -> %s%s", sym->name, sym2 == sym? "\n": "");
 856         sym->flags &= ~SYMBOL_CHECK;
 857         return sym2;
 858 }
 859
 860 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
 861 {
 862         struct property *prop;
 863         struct property **propp;
 864
 865         prop = malloc(sizeof(*prop));
 866         memset(prop, 0, sizeof(*prop));
 867         prop->type = type;
 868         prop->sym = sym;
 869         prop->file = current_file;
 870         prop->lineno = zconf_lineno();
 871
 872         /* append property to the prop list of symbol */
 873         if (sym) {
 874                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
 875                         ;
 876                 *propp = prop;
 877         }
 878
 879         return prop;
 880 }
 881
 882 struct symbol *prop_get_symbol(struct property *prop)
 883 {
 884         if (prop->expr && (prop->expr->type == E_SYMBOL ||
 885                            prop->expr->type == E_LIST))
 886                 return prop->expr->left.sym;
 887         return NULL;
 888 }
 889
 890 const char *prop_get_type_name(enum prop_type type)
 891 {
 892         switch (type) {
 893         case P_PROMPT:
 894                 return "prompt";
 895         case P_ENV:
 896                 return "env";
 897         case P_COMMENT:
 898                 return "comment";
 899         case P_MENU:
 900                 return "menu";
 901         case P_DEFAULT:
 902                 return "default";
 903         case P_CHOICE:
 904                 return "choice";
 905         case P_SELECT:
 906                 return "select";
 907         case P_RANGE:
 908                 return "range";
 909         case P_UNKNOWN:
 910                 break;
 911         }
 912         return "unknown";
 913 }
 914
 915 void prop_add_env(const char *env)
 916 {
 917         struct symbol *sym, *sym2;
 918         struct property *prop;
 919         char *p;
 920
 921         sym = current_entry->sym;
 922         sym->flags |= SYMBOL_AUTO;
 923         for_all_properties(sym, prop, P_ENV) {
 924                 sym2 = prop_get_symbol(prop);
 925                 if (strcmp(sym2->name, env))
 926                         menu_warn(current_entry, "redefining environment symbol from %s",
 927                                   sym2->name);
 928                 return;
 929         }
 930
 931         prop = prop_alloc(P_ENV, sym);
 932         prop->expr = expr_alloc_symbol(sym_lookup(env, 1));
 933
 934         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
 935         sym_env_list->right.sym = sym;
 936
 937         p = getenv(env);
 938         if (p)
 939                 sym_add_default(sym, p);
 940         else
 941                 menu_warn(current_entry, "environment variable %s undefined", env);
 942 }