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 static 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, SYMBOL_CONST));
  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 static 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         /* defaulting to "yes" if no explicit "depends on" are given */
 209         tri = yes;
 210         if (sym->dir_dep.expr)
 211                 tri = expr_calc_value(sym->dir_dep.expr);
 212         if (tri == mod)
 213                 tri = yes;
 214         if (sym->dir_dep.tri != tri) {
 215                 sym->dir_dep.tri = tri;
 216                 sym_set_changed(sym);
 217         }
 218         tri = no;
 219         if (sym->rev_dep.expr)
 220                 tri = expr_calc_value(sym->rev_dep.expr);
 221         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 222                 tri = yes;
 223         if (sym->rev_dep.tri != tri) {
 224                 sym->rev_dep.tri = tri;
 225                 sym_set_changed(sym);
 226         }
 227 }
 228
 229 /*
 230  * Find the default symbol for a choice.
 231  * First try the default values for the choice symbol
 232  * Next locate the first visible choice value
 233  * Return NULL if none was found
 234  */
 235 struct symbol *sym_choice_default(struct symbol *sym)
 236 {
 237         struct symbol *def_sym;
 238         struct property *prop;
 239         struct expr *e;
 240
 241         /* any of the defaults visible? */
 242         for_all_defaults(sym, prop) {
 243                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 244                 if (prop->visible.tri == no)
 245                         continue;
 246                 def_sym = prop_get_symbol(prop);
 247                 if (def_sym->visible != no)
 248                         return def_sym;
 249         }
 250
 251         /* just get the first visible value */
 252         prop = sym_get_choice_prop(sym);
 253         expr_list_for_each_sym(prop->expr, e, def_sym)
 254                 if (def_sym->visible != no)
 255                         return def_sym;
 256
 257         /* failed to locate any defaults */
 258         return NULL;
 259 }
 260
 261 static struct symbol *sym_calc_choice(struct symbol *sym)
 262 {
 263         struct symbol *def_sym;
 264         struct property *prop;
 265         struct expr *e;
 266
 267         /* first calculate all choice values' visibilities */
 268         prop = sym_get_choice_prop(sym);
 269         expr_list_for_each_sym(prop->expr, e, def_sym)
 270                 sym_calc_visibility(def_sym);
 271
 272         /* is the user choice visible? */
 273         def_sym = sym->def[S_DEF_USER].val;
 274         if (def_sym && def_sym->visible != no)
 275                 return def_sym;
 276
 277         def_sym = sym_choice_default(sym);
 278
 279         if (def_sym == NULL)
 280                 /* no choice? reset tristate value */
 281                 sym->curr.tri = no;
 282
 283         return def_sym;
 284 }
 285
 286 void sym_calc_value(struct symbol *sym)
 287 {
 288         struct symbol_value newval, oldval;
 289         struct property *prop;
 290         struct expr *e;
 291
 292         if (!sym)
 293                 return;
 294
 295         if (sym->flags & SYMBOL_VALID)
 296                 return;
 297         sym->flags |= SYMBOL_VALID;
 298
 299         oldval = sym->curr;
 300
 301         switch (sym->type) {
 302         case S_INT:
 303         case S_HEX:
 304         case S_STRING:
 305                 newval = symbol_empty.curr;
 306                 break;
 307         case S_BOOLEAN:
 308         case S_TRISTATE:
 309                 newval = symbol_no.curr;
 310                 break;
 311         default:
 312                 sym->curr.val = sym->name;
 313                 sym->curr.tri = no;
 314                 return;
 315         }
 316         if (!sym_is_choice_value(sym))
 317                 sym->flags &= ~SYMBOL_WRITE;
 318
 319         sym_calc_visibility(sym);
 320
 321         /* set default if recursively called */
 322         sym->curr = newval;
 323
 324         switch (sym_get_type(sym)) {
 325         case S_BOOLEAN:
 326         case S_TRISTATE:
 327                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 328                         prop = sym_get_choice_prop(sym);
 329                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 330                 } else {
 331                         if (sym->visible != no) {
 332                                 /* if the symbol is visible use the user value
 333                                  * if available, otherwise try the default value
 334                                  */
 335                                 sym->flags |= SYMBOL_WRITE;
 336                                 if (sym_has_value(sym)) {
 337                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 338                                                               sym->visible);
 339                                         goto calc_newval;
 340                                 }
 341                         }
 342                         if (sym->rev_dep.tri != no)
 343                                 sym->flags |= SYMBOL_WRITE;
 344                         if (!sym_is_choice(sym)) {
 345                                 prop = sym_get_default_prop(sym);
 346                                 if (prop) {
 347                                         sym->flags |= SYMBOL_WRITE;
 348                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 349                                                               prop->visible.tri);
 350                                 }
 351                         }
 352                 calc_newval:
 353 #if 0
 354                         if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
 355                                 fprintf(stderr, "warning: (");
 356                                 expr_fprint(sym->rev_dep.expr, stderr);
 357                                 fprintf(stderr, ") selects %s which has unmet direct dependencies (",
 358                                         sym->name);
 359                                 expr_fprint(sym->dir_dep.expr, stderr);
 360                                 fprintf(stderr, ")\n");
 361                         }
 362 #endif
 363                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 364                 }
 365                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 366                         newval.tri = yes;
 367                 break;
 368         case S_STRING:
 369         case S_HEX:
 370         case S_INT:
 371                 if (sym->visible != no) {
 372                         sym->flags |= SYMBOL_WRITE;
 373                         if (sym_has_value(sym)) {
 374                                 newval.val = sym->def[S_DEF_USER].val;
 375                                 break;
 376                         }
 377                 }
 378                 prop = sym_get_default_prop(sym);
 379                 if (prop) {
 380                         struct symbol *ds = prop_get_symbol(prop);
 381                         if (ds) {
 382                                 sym->flags |= SYMBOL_WRITE;
 383                                 sym_calc_value(ds);
 384                                 newval.val = ds->curr.val;
 385                         }
 386                 }
 387                 break;
 388         default:
 389                 ;
 390         }
 391
 392         sym->curr = newval;
 393         if (sym_is_choice(sym) && newval.tri == yes)
 394                 sym->curr.val = sym_calc_choice(sym);
 395         sym_validate_range(sym);
 396
 397         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 398                 sym_set_changed(sym);
 399                 if (modules_sym == sym) {
 400                         sym_set_all_changed();
 401                         modules_val = modules_sym->curr.tri;
 402                 }
 403         }
 404
 405         if (sym_is_choice(sym)) {
 406                 struct symbol *choice_sym;
 407
 408                 prop = sym_get_choice_prop(sym);
 409                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 410                         if ((sym->flags & SYMBOL_WRITE) &&
 411                             choice_sym->visible != no)
 412                                 choice_sym->flags |= SYMBOL_WRITE;
 413                         if (sym->flags & SYMBOL_CHANGED)
 414                                 sym_set_changed(choice_sym);
 415                 }
 416         }
 417
 418         if (sym->flags & SYMBOL_AUTO)
 419                 sym->flags &= ~SYMBOL_WRITE;
 420 }
 421
 422 void sym_clear_all_valid(void)
 423 {
 424         struct symbol *sym;
 425         int i;
 426
 427         for_all_symbols(i, sym)
 428                 sym->flags &= ~SYMBOL_VALID;
 429         sym_add_change_count(1);
 430         if (modules_sym)
 431                 sym_calc_value(modules_sym);
 432 }
 433
 434 void sym_set_changed(struct symbol *sym)
 435 {
 436         struct property *prop;
 437
 438         sym->flags |= SYMBOL_CHANGED;
 439         for (prop = sym->prop; prop; prop = prop->next) {
 440                 if (prop->menu)
 441                         prop->menu->flags |= MENU_CHANGED;
 442         }
 443 }
 444
 445 void sym_set_all_changed(void)
 446 {
 447         struct symbol *sym;
 448         int i;
 449
 450         for_all_symbols(i, sym)
 451                 sym_set_changed(sym);
 452 }
 453
 454 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 455 {
 456         int type = sym_get_type(sym);
 457
 458         if (sym->visible == no)
 459                 return false;
 460
 461         if (type != S_BOOLEAN && type != S_TRISTATE)
 462                 return false;
 463
 464         if (type == S_BOOLEAN && val == mod)
 465                 return false;
 466         if (sym->visible <= sym->rev_dep.tri)
 467                 return false;
 468         if (sym_is_choice_value(sym) && sym->visible == yes)
 469                 return val == yes;
 470         return val >= sym->rev_dep.tri && val <= sym->visible;
 471 }
 472
 473 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 474 {
 475         tristate oldval = sym_get_tristate_value(sym);
 476
 477         if (oldval != val && !sym_tristate_within_range(sym, val))
 478                 return false;
 479
 480         if (!(sym->flags & SYMBOL_DEF_USER)) {
 481                 sym->flags |= SYMBOL_DEF_USER;
 482                 sym_set_changed(sym);
 483         }
 484         /*
 485          * setting a choice value also resets the new flag of the choice
 486          * symbol and all other choice values.
 487          */
 488         if (sym_is_choice_value(sym) && val == yes) {
 489                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 490                 struct property *prop;
 491                 struct expr *e;
 492
 493                 cs->def[S_DEF_USER].val = sym;
 494                 cs->flags |= SYMBOL_DEF_USER;
 495                 prop = sym_get_choice_prop(cs);
 496                 for (e = prop->expr; e; e = e->left.expr) {
 497                         if (e->right.sym->visible != no)
 498                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 499                 }
 500         }
 501
 502         sym->def[S_DEF_USER].tri = val;
 503         if (oldval != val)
 504                 sym_clear_all_valid();
 505
 506         return true;
 507 }
 508
 509 tristate sym_toggle_tristate_value(struct symbol *sym)
 510 {
 511         tristate oldval, newval;
 512
 513         oldval = newval = sym_get_tristate_value(sym);
 514         do {
 515                 switch (newval) {
 516                 case no:
 517                         newval = mod;
 518                         break;
 519                 case mod:
 520                         newval = yes;
 521                         break;
 522                 case yes:
 523                         newval = no;
 524                         break;
 525                 }
 526                 if (sym_set_tristate_value(sym, newval))
 527                         break;
 528         } while (oldval != newval);
 529         return newval;
 530 }
 531
 532 bool sym_string_valid(struct symbol *sym, const char *str)
 533 {
 534         signed char ch;
 535
 536         switch (sym->type) {
 537         case S_STRING:
 538                 return true;
 539         case S_INT:
 540                 ch = *str++;
 541                 if (ch == '-')
 542                         ch = *str++;
 543                 if (!isdigit(ch))
 544                         return false;
 545                 if (ch == '0' && *str != 0)
 546                         return false;
 547                 while ((ch = *str++)) {
 548                         if (!isdigit(ch))
 549                                 return false;
 550                 }
 551                 return true;
 552         case S_HEX:
 553                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 554                         str += 2;
 555                 ch = *str++;
 556                 do {
 557                         if (!isxdigit(ch))
 558                                 return false;
 559                 } while ((ch = *str++));
 560                 return true;
 561         case S_BOOLEAN:
 562         case S_TRISTATE:
 563                 switch (str[0]) {
 564                 case 'y': case 'Y':
 565                 case 'm': case 'M':
 566                 case 'n': case 'N':
 567                         return true;
 568                 }
 569                 return false;
 570         default:
 571                 return false;
 572         }
 573 }
 574
 575 bool sym_string_within_range(struct symbol *sym, const char *str)
 576 {
 577         struct property *prop;
 578         int val;
 579
 580         switch (sym->type) {
 581         case S_STRING:
 582                 return sym_string_valid(sym, str);
 583         case S_INT:
 584                 if (!sym_string_valid(sym, str))
 585                         return false;
 586                 prop = sym_get_range_prop(sym);
 587                 if (!prop)
 588                         return true;
 589                 val = strtol(str, NULL, 10);
 590                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 591                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 592         case S_HEX:
 593                 if (!sym_string_valid(sym, str))
 594                         return false;
 595                 prop = sym_get_range_prop(sym);
 596                 if (!prop)
 597                         return true;
 598                 val = strtol(str, NULL, 16);
 599                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 600                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 601         case S_BOOLEAN:
 602         case S_TRISTATE:
 603                 switch (str[0]) {
 604                 case 'y': case 'Y':
 605                         return sym_tristate_within_range(sym, yes);
 606                 case 'm': case 'M':
 607                         return sym_tristate_within_range(sym, mod);
 608                 case 'n': case 'N':
 609                         return sym_tristate_within_range(sym, no);
 610                 }
 611                 return false;
 612         default:
 613                 return false;
 614         }
 615 }
 616
 617 bool sym_set_string_value(struct symbol *sym, const char *newval)
 618 {
 619         const char *oldval;
 620         char *val;
 621         int size;
 622
 623         switch (sym->type) {
 624         case S_BOOLEAN:
 625         case S_TRISTATE:
 626                 switch (newval[0]) {
 627                 case 'y': case 'Y':
 628                         return sym_set_tristate_value(sym, yes);
 629                 case 'm': case 'M':
 630                         return sym_set_tristate_value(sym, mod);
 631                 case 'n': case 'N':
 632                         return sym_set_tristate_value(sym, no);
 633                 }
 634                 return false;
 635         default:
 636                 ;
 637         }
 638
 639         if (!sym_string_within_range(sym, newval))
 640                 return false;
 641
 642         if (!(sym->flags & SYMBOL_DEF_USER)) {
 643                 sym->flags |= SYMBOL_DEF_USER;
 644                 sym_set_changed(sym);
 645         }
 646
 647         oldval = sym->def[S_DEF_USER].val;
 648         size = strlen(newval) + 1;
 649         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 650                 size += 2;
 651                 sym->def[S_DEF_USER].val = val = malloc(size);
 652                 *val++ = '0';
 653                 *val++ = 'x';
 654         } else if (!oldval || strcmp(oldval, newval))
 655                 sym->def[S_DEF_USER].val = val = malloc(size);
 656         else
 657                 return true;
 658
 659         strcpy(val, newval);
 660         free((void *)oldval);
 661         sym_clear_all_valid();
 662
 663         return true;
 664 }
 665
 666 /*
 667  * Find the default value associated to a symbol.
 668  * For tristate symbol handle the modules=n case
 669  * in which case "m" becomes "y".
 670  * If the symbol does not have any default then fallback
 671  * to the fixed default values.
 672  */
 673 const char *sym_get_string_default(struct symbol *sym)
 674 {
 675         struct property *prop;
 676         struct symbol *ds;
 677         const char *str;
 678         tristate val;
 679
 680         sym_calc_visibility(sym);
 681         sym_calc_value(modules_sym);
 682         val = symbol_no.curr.tri;
 683         str = symbol_empty.curr.val;
 684
 685         /* If symbol has a default value look it up */
 686         prop = sym_get_default_prop(sym);
 687         if (prop != NULL) {
 688                 switch (sym->type) {
 689                 case S_BOOLEAN:
 690                 case S_TRISTATE:
 691                         /* The visibility imay limit the value from yes => mod */
 692                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 693                         break;
 694                 default:
 695                         /*
 696                          * The following fails to handle the situation
 697                          * where a default value is further limited by
 698                          * the valid range.
 699                          */
 700                         ds = prop_get_symbol(prop);
 701                         if (ds != NULL) {
 702                                 sym_calc_value(ds);
 703                                 str = (const char *)ds->curr.val;
 704                         }
 705                 }
 706         }
 707
 708         /* Handle select statements */
 709         val = EXPR_OR(val, sym->rev_dep.tri);
 710
 711         /* transpose mod to yes if modules are not enabled */
 712         if (val == mod)
 713                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 714                         val = yes;
 715
 716         /* transpose mod to yes if type is bool */
 717         if (sym->type == S_BOOLEAN && val == mod)
 718                 val = yes;
 719
 720         switch (sym->type) {
 721         case S_BOOLEAN:
 722         case S_TRISTATE:
 723                 switch (val) {
 724                 case no: return "n";
 725                 case mod: return "m";
 726                 case yes: return "y";
 727                 }
 728         case S_INT:
 729         case S_HEX:
 730                 return str;
 731         case S_STRING:
 732                 return str;
 733         case S_OTHER:
 734         case S_UNKNOWN:
 735                 break;
 736         }
 737         return "";
 738 }
 739
 740 const char *sym_get_string_value(struct symbol *sym)
 741 {
 742         tristate val;
 743
 744         switch (sym->type) {
 745         case S_BOOLEAN:
 746         case S_TRISTATE:
 747                 val = sym_get_tristate_value(sym);
 748                 switch (val) {
 749                 case no:
 750                         return "n";
 751                 case mod:
 752                         return "m";
 753                 case yes:
 754                         return "y";
 755                 }
 756                 break;
 757         default:
 758                 ;
 759         }
 760         return (const char *)sym->curr.val;
 761 }
 762
 763 bool sym_is_changable(struct symbol *sym)
 764 {
 765         return sym->visible > sym->rev_dep.tri;
 766 }
 767
 768 static unsigned strhash(const char *s)
 769 {
 770         /* fnv32 hash */
 771         unsigned hash = 2166136261U;
 772         for (; *s; s++)
 773                 hash = (hash ^ *s) * 0x01000193;
 774         return hash;
 775 }
 776
 777 struct symbol *sym_lookup(const char *name, int flags)
 778 {
 779         struct symbol *symbol;
 780         char *new_name;
 781         int hash;
 782
 783         if (name) {
 784                 if (name[0] && !name[1]) {
 785                         switch (name[0]) {
 786                         case 'y': return &symbol_yes;
 787                         case 'm': return &symbol_mod;
 788                         case 'n': return &symbol_no;
 789                         }
 790                 }
 791                 hash = strhash(name) % SYMBOL_HASHSIZE;
 792
 793                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 794                         if (symbol->name &&
 795                             !strcmp(symbol->name, name) &&
 796                             (flags ? symbol->flags & flags
 797                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 798                                 return symbol;
 799                 }
 800                 new_name = strdup(name);
 801         } else {
 802                 new_name = NULL;
 803                 hash = 0;
 804         }
 805
 806         symbol = malloc(sizeof(*symbol));
 807         memset(symbol, 0, sizeof(*symbol));
 808         symbol->name = new_name;
 809         symbol->type = S_UNKNOWN;
 810         symbol->flags |= flags;
 811
 812         symbol->next = symbol_hash[hash];
 813         symbol_hash[hash] = symbol;
 814
 815         return symbol;
 816 }
 817
 818 struct symbol *sym_find(const char *name)
 819 {
 820         struct symbol *symbol = NULL;
 821         int hash = 0;
 822
 823         if (!name)
 824                 return NULL;
 825
 826         if (name[0] && !name[1]) {
 827                 switch (name[0]) {
 828                 case 'y': return &symbol_yes;
 829                 case 'm': return &symbol_mod;
 830                 case 'n': return &symbol_no;
 831                 }
 832         }
 833         hash = strhash(name) % SYMBOL_HASHSIZE;
 834
 835         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 836                 if (symbol->name &&
 837                     !strcmp(symbol->name, name) &&
 838                     !(symbol->flags & SYMBOL_CONST))
 839                                 break;
 840         }
 841
 842         return symbol;
 843 }
 844
 845 struct symbol **sym_re_search(const char *pattern)
 846 {
 847         struct symbol *sym, **sym_arr = NULL;
 848         int i, cnt, size;
 849         regex_t re;
 850
 851         cnt = size = 0;
 852         /* Skip if empty */
 853         if (strlen(pattern) == 0)
 854                 return NULL;
 855         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 856                 return NULL;
 857
 858         for_all_symbols(i, sym) {
 859                 if (sym->flags & SYMBOL_CONST || !sym->name)
 860                         continue;
 861                 if (regexec(&re, sym->name, 0, NULL, 0))
 862                         continue;
 863                 if (cnt + 1 >= size) {
 864                         void *tmp = sym_arr;
 865                         size += 16;
 866                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 867                         if (!sym_arr) {
 868                                 free(tmp);
 869                                 return NULL;
 870                         }
 871                 }
 872                 sym_calc_value(sym);
 873                 sym_arr[cnt++] = sym;
 874         }
 875         if (sym_arr)
 876                 sym_arr[cnt] = NULL;
 877         regfree(&re);
 878
 879         return sym_arr;
 880 }
 881
 882 /*
 883  * When we check for recursive dependencies we use a stack to save
 884  * current state so we can print out relevant info to user.
 885  * The entries are located on the call stack so no need to free memory.
 886  * Note inser() remove() must always match to properly clear the stack.
 887  */
 888 static struct dep_stack {
 889         struct dep_stack *prev, *next;
 890         struct symbol *sym;
 891         struct property *prop;
 892         struct expr *expr;
 893 } *check_top;
 894
 895 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
 896 {
 897         memset(stack, 0, sizeof(*stack));
 898         if (check_top)
 899                 check_top->next = stack;
 900         stack->prev = check_top;
 901         stack->sym = sym;
 902         check_top = stack;
 903 }
 904
 905 static void dep_stack_remove(void)
 906 {
 907         check_top = check_top->prev;
 908         if (check_top)
 909                 check_top->next = NULL;
 910 }
 911
 912 /*
 913  * Called when we have detected a recursive dependency.
 914  * check_top point to the top of the stact so we use
 915  * the ->prev pointer to locate the bottom of the stack.
 916  */
 917 static void sym_check_print_recursive(struct symbol *last_sym)
 918 {
 919         struct dep_stack *stack;
 920         struct symbol *sym, *next_sym;
 921         struct menu *menu = NULL;
 922         struct property *prop;
 923         struct dep_stack cv_stack;
 924
 925         if (sym_is_choice_value(last_sym)) {
 926                 dep_stack_insert(&cv_stack, last_sym);
 927                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
 928         }
 929
 930         for (stack = check_top; stack != NULL; stack = stack->prev)
 931                 if (stack->sym == last_sym)
 932                         break;
 933         if (!stack) {
 934                 fprintf(stderr, "unexpected recursive dependency error\n");
 935                 return;
 936         }
 937
 938         for (; stack; stack = stack->next) {
 939                 sym = stack->sym;
 940                 next_sym = stack->next ? stack->next->sym : last_sym;
 941                 prop = stack->prop;
 942                 if (prop == NULL)
 943                         prop = stack->sym->prop;
 944
 945                 /* for choice values find the menu entry (used below) */
 946                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
 947                         for (prop = sym->prop; prop; prop = prop->next) {
 948                                 menu = prop->menu;
 949                                 if (prop->menu)
 950                                         break;
 951                         }
 952                 }
 953                 if (stack->sym == last_sym)
 954                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
 955                                 prop->file->name, prop->lineno);
 956                 if (stack->expr) {
 957                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
 958                                 prop->file->name, prop->lineno,
 959                                 sym->name ? sym->name : "<choice>",
 960                                 prop_get_type_name(prop->type),
 961                                 next_sym->name ? next_sym->name : "<choice>");
 962                 } else if (stack->prop) {
 963                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
 964                                 prop->file->name, prop->lineno,
 965                                 sym->name ? sym->name : "<choice>",
 966                                 next_sym->name ? next_sym->name : "<choice>");
 967                 } else if (sym_is_choice(sym)) {
 968                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
 969                                 menu->file->name, menu->lineno,
 970                                 sym->name ? sym->name : "<choice>",
 971                                 next_sym->name ? next_sym->name : "<choice>");
 972                 } else if (sym_is_choice_value(sym)) {
 973                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
 974                                 menu->file->name, menu->lineno,
 975                                 sym->name ? sym->name : "<choice>",
 976                                 next_sym->name ? next_sym->name : "<choice>");
 977                 } else {
 978                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
 979                                 prop->file->name, prop->lineno,
 980                                 sym->name ? sym->name : "<choice>",
 981                                 next_sym->name ? next_sym->name : "<choice>");
 982                 }
 983         }
 984
 985         if (check_top == &cv_stack)
 986                 dep_stack_remove();
 987 }
 988
 989 static struct symbol *sym_check_expr_deps(struct expr *e)
 990 {
 991         struct symbol *sym;
 992
 993         if (!e)
 994                 return NULL;
 995         switch (e->type) {
 996         case E_OR:
 997         case E_AND:
 998                 sym = sym_check_expr_deps(e->left.expr);
 999                 if (sym)
1000                         return sym;
1001                 return sym_check_expr_deps(e->right.expr);
1002         case E_NOT:
1003                 return sym_check_expr_deps(e->left.expr);
1004         case E_EQUAL:
1005         case E_UNEQUAL:
1006                 sym = sym_check_deps(e->left.sym);
1007                 if (sym)
1008                         return sym;
1009                 return sym_check_deps(e->right.sym);
1010         case E_SYMBOL:
1011                 return sym_check_deps(e->left.sym);
1012         default:
1013                 break;
1014         }
1015         printf("Oops! How to check %d?\n", e->type);
1016         return NULL;
1017 }
1018
1019 /* return NULL when dependencies are OK */
1020 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1021 {
1022         struct symbol *sym2;
1023         struct property *prop;
1024         struct dep_stack stack;
1025
1026         dep_stack_insert(&stack, sym);
1027
1028         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1029         if (sym2)
1030                 goto out;
1031
1032         for (prop = sym->prop; prop; prop = prop->next) {
1033                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1034                         continue;
1035                 stack.prop = prop;
1036                 sym2 = sym_check_expr_deps(prop->visible.expr);
1037                 if (sym2)
1038                         break;
1039                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1040                         continue;
1041                 stack.expr = prop->expr;
1042                 sym2 = sym_check_expr_deps(prop->expr);
1043                 if (sym2)
1044                         break;
1045                 stack.expr = NULL;
1046         }
1047
1048 out:
1049         dep_stack_remove();
1050
1051         return sym2;
1052 }
1053
1054 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1055 {
1056         struct symbol *sym, *sym2;
1057         struct property *prop;
1058         struct expr *e;
1059         struct dep_stack stack;
1060
1061         dep_stack_insert(&stack, choice);
1062
1063         prop = sym_get_choice_prop(choice);
1064         expr_list_for_each_sym(prop->expr, e, sym)
1065                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1066
1067         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1068         sym2 = sym_check_sym_deps(choice);
1069         choice->flags &= ~SYMBOL_CHECK;
1070         if (sym2)
1071                 goto out;
1072
1073         expr_list_for_each_sym(prop->expr, e, sym) {
1074                 sym2 = sym_check_sym_deps(sym);
1075                 if (sym2)
1076                         break;
1077         }
1078 out:
1079         expr_list_for_each_sym(prop->expr, e, sym)
1080                 sym->flags &= ~SYMBOL_CHECK;
1081
1082         if (sym2 && sym_is_choice_value(sym2) &&
1083             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1084                 sym2 = choice;
1085
1086         dep_stack_remove();
1087
1088         return sym2;
1089 }
1090
1091 struct symbol *sym_check_deps(struct symbol *sym)
1092 {
1093         struct symbol *sym2;
1094         struct property *prop;
1095
1096         if (sym->flags & SYMBOL_CHECK) {
1097                 sym_check_print_recursive(sym);
1098                 return sym;
1099         }
1100         if (sym->flags & SYMBOL_CHECKED)
1101                 return NULL;
1102
1103         if (sym_is_choice_value(sym)) {
1104                 struct dep_stack stack;
1105
1106                 /* for choice groups start the check with main choice symbol */
1107                 dep_stack_insert(&stack, sym);
1108                 prop = sym_get_choice_prop(sym);
1109                 sym2 = sym_check_deps(prop_get_symbol(prop));
1110                 dep_stack_remove();
1111         } else if (sym_is_choice(sym)) {
1112                 sym2 = sym_check_choice_deps(sym);
1113         } else {
1114                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1115                 sym2 = sym_check_sym_deps(sym);
1116                 sym->flags &= ~SYMBOL_CHECK;
1117         }
1118
1119         if (sym2 && sym2 == sym)
1120                 sym2 = NULL;
1121
1122         return sym2;
1123 }
1124
1125 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1126 {
1127         struct property *prop;
1128         struct property **propp;
1129
1130         prop = malloc(sizeof(*prop));
1131         memset(prop, 0, sizeof(*prop));
1132         prop->type = type;
1133         prop->sym = sym;
1134         prop->file = current_file;
1135         prop->lineno = zconf_lineno();
1136
1137         /* append property to the prop list of symbol */
1138         if (sym) {
1139                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1140                         ;
1141                 *propp = prop;
1142         }
1143
1144         return prop;
1145 }
1146
1147 struct symbol *prop_get_symbol(struct property *prop)
1148 {
1149         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1150                            prop->expr->type == E_LIST))
1151                 return prop->expr->left.sym;
1152         return NULL;
1153 }
1154
1155 const char *prop_get_type_name(enum prop_type type)
1156 {
1157         switch (type) {
1158         case P_PROMPT:
1159                 return "prompt";
1160         case P_ENV:
1161                 return "env";
1162         case P_COMMENT:
1163                 return "comment";
1164         case P_MENU:
1165                 return "menu";
1166         case P_DEFAULT:
1167                 return "default";
1168         case P_CHOICE:
1169                 return "choice";
1170         case P_SELECT:
1171                 return "select";
1172         case P_RANGE:
1173                 return "range";
1174         case P_SYMBOL:
1175                 return "symbol";
1176         case P_UNKNOWN:
1177                 break;
1178         }
1179         return "unknown";
1180 }
1181
1182 static void prop_add_env(const char *env)
1183 {
1184         struct symbol *sym, *sym2;
1185         struct property *prop;
1186         char *p;
1187
1188         sym = current_entry->sym;
1189         sym->flags |= SYMBOL_AUTO;
1190         for_all_properties(sym, prop, P_ENV) {
1191                 sym2 = prop_get_symbol(prop);
1192                 if (strcmp(sym2->name, env))
1193                         menu_warn(current_entry, "redefining environment symbol from %s",
1194                                   sym2->name);
1195                 return;
1196         }
1197
1198         prop = prop_alloc(P_ENV, sym);
1199         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1200
1201         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1202         sym_env_list->right.sym = sym;
1203
1204         p = getenv(env);
1205         if (p)
1206                 sym_add_default(sym, p);
1207         else
1208                 menu_warn(current_entry, "environment variable %s undefined", env);
1209 }