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 /*
 846  * Expand symbol's names embedded in the string given in argument. Symbols'
 847  * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
 848  * the empty string.
 849  */
 850 const char *sym_expand_string_value(const char *in)
 851 {
 852         const char *src;
 853         char *res;
 854         size_t reslen;
 855
 856         reslen = strlen(in) + 1;
 857         res = malloc(reslen);
 858         res[0] = '\0';
 859
 860         while ((src = strchr(in, '$'))) {
 861                 char *p, name[SYMBOL_MAXLENGTH];
 862                 const char *symval = "";
 863                 struct symbol *sym;
 864                 size_t newlen;
 865
 866                 strncat(res, in, src - in);
 867                 src++;
 868
 869                 p = name;
 870                 while (isalnum(*src) || *src == '_')
 871                         *p++ = *src++;
 872                 *p = '\0';
 873
 874                 sym = sym_find(name);
 875                 if (sym != NULL) {
 876                         sym_calc_value(sym);
 877                         symval = sym_get_string_value(sym);
 878                 }
 879
 880                 newlen = strlen(res) + strlen(symval) + strlen(src);
 881                 if (newlen > reslen) {
 882                         reslen = newlen;
 883                         res = realloc(res, reslen);
 884                 }
 885
 886                 strcat(res, symval);
 887                 in = src;
 888         }
 889         strcat(res, in);
 890
 891         return res;
 892 }
 893
 894 struct symbol **sym_re_search(const char *pattern)
 895 {
 896         struct symbol *sym, **sym_arr = NULL;
 897         int i, cnt, size;
 898         regex_t re;
 899
 900         cnt = size = 0;
 901         /* Skip if empty */
 902         if (strlen(pattern) == 0)
 903                 return NULL;
 904         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 905                 return NULL;
 906
 907         for_all_symbols(i, sym) {
 908                 if (sym->flags & SYMBOL_CONST || !sym->name)
 909                         continue;
 910                 if (regexec(&re, sym->name, 0, NULL, 0))
 911                         continue;
 912                 if (cnt + 1 >= size) {
 913                         void *tmp = sym_arr;
 914                         size += 16;
 915                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 916                         if (!sym_arr) {
 917                                 free(tmp);
 918                                 return NULL;
 919                         }
 920                 }
 921                 sym_calc_value(sym);
 922                 sym_arr[cnt++] = sym;
 923         }
 924         if (sym_arr)
 925                 sym_arr[cnt] = NULL;
 926         regfree(&re);
 927
 928         return sym_arr;
 929 }
 930
 931 /*
 932  * When we check for recursive dependencies we use a stack to save
 933  * current state so we can print out relevant info to user.
 934  * The entries are located on the call stack so no need to free memory.
 935  * Note inser() remove() must always match to properly clear the stack.
 936  */
 937 static struct dep_stack {
 938         struct dep_stack *prev, *next;
 939         struct symbol *sym;
 940         struct property *prop;
 941         struct expr *expr;
 942 } *check_top;
 943
 944 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
 945 {
 946         memset(stack, 0, sizeof(*stack));
 947         if (check_top)
 948                 check_top->next = stack;
 949         stack->prev = check_top;
 950         stack->sym = sym;
 951         check_top = stack;
 952 }
 953
 954 static void dep_stack_remove(void)
 955 {
 956         check_top = check_top->prev;
 957         if (check_top)
 958                 check_top->next = NULL;
 959 }
 960
 961 /*
 962  * Called when we have detected a recursive dependency.
 963  * check_top point to the top of the stact so we use
 964  * the ->prev pointer to locate the bottom of the stack.
 965  */
 966 static void sym_check_print_recursive(struct symbol *last_sym)
 967 {
 968         struct dep_stack *stack;
 969         struct symbol *sym, *next_sym;
 970         struct menu *menu = NULL;
 971         struct property *prop;
 972         struct dep_stack cv_stack;
 973
 974         if (sym_is_choice_value(last_sym)) {
 975                 dep_stack_insert(&cv_stack, last_sym);
 976                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
 977         }
 978
 979         for (stack = check_top; stack != NULL; stack = stack->prev)
 980                 if (stack->sym == last_sym)
 981                         break;
 982         if (!stack) {
 983                 fprintf(stderr, "unexpected recursive dependency error\n");
 984                 return;
 985         }
 986
 987         for (; stack; stack = stack->next) {
 988                 sym = stack->sym;
 989                 next_sym = stack->next ? stack->next->sym : last_sym;
 990                 prop = stack->prop;
 991                 if (prop == NULL)
 992                         prop = stack->sym->prop;
 993
 994                 /* for choice values find the menu entry (used below) */
 995                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
 996                         for (prop = sym->prop; prop; prop = prop->next) {
 997                                 menu = prop->menu;
 998                                 if (prop->menu)
 999                                         break;
1000                         }
1001                 }
1002                 if (stack->sym == last_sym)
1003                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1004                                 prop->file->name, prop->lineno);
1005                 if (stack->expr) {
1006                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1007                                 prop->file->name, prop->lineno,
1008                                 sym->name ? sym->name : "<choice>",
1009                                 prop_get_type_name(prop->type),
1010                                 next_sym->name ? next_sym->name : "<choice>");
1011                 } else if (stack->prop) {
1012                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1013                                 prop->file->name, prop->lineno,
1014                                 sym->name ? sym->name : "<choice>",
1015                                 next_sym->name ? next_sym->name : "<choice>");
1016                 } else if (sym_is_choice(sym)) {
1017                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1018                                 menu->file->name, menu->lineno,
1019                                 sym->name ? sym->name : "<choice>",
1020                                 next_sym->name ? next_sym->name : "<choice>");
1021                 } else if (sym_is_choice_value(sym)) {
1022                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1023                                 menu->file->name, menu->lineno,
1024                                 sym->name ? sym->name : "<choice>",
1025                                 next_sym->name ? next_sym->name : "<choice>");
1026                 } else {
1027                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1028                                 prop->file->name, prop->lineno,
1029                                 sym->name ? sym->name : "<choice>",
1030                                 next_sym->name ? next_sym->name : "<choice>");
1031                 }
1032         }
1033
1034         if (check_top == &cv_stack)
1035                 dep_stack_remove();
1036 }
1037
1038 static struct symbol *sym_check_expr_deps(struct expr *e)
1039 {
1040         struct symbol *sym;
1041
1042         if (!e)
1043                 return NULL;
1044         switch (e->type) {
1045         case E_OR:
1046         case E_AND:
1047                 sym = sym_check_expr_deps(e->left.expr);
1048                 if (sym)
1049                         return sym;
1050                 return sym_check_expr_deps(e->right.expr);
1051         case E_NOT:
1052                 return sym_check_expr_deps(e->left.expr);
1053         case E_EQUAL:
1054         case E_UNEQUAL:
1055                 sym = sym_check_deps(e->left.sym);
1056                 if (sym)
1057                         return sym;
1058                 return sym_check_deps(e->right.sym);
1059         case E_SYMBOL:
1060                 return sym_check_deps(e->left.sym);
1061         default:
1062                 break;
1063         }
1064         printf("Oops! How to check %d?\n", e->type);
1065         return NULL;
1066 }
1067
1068 /* return NULL when dependencies are OK */
1069 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1070 {
1071         struct symbol *sym2;
1072         struct property *prop;
1073         struct dep_stack stack;
1074
1075         dep_stack_insert(&stack, sym);
1076
1077         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1078         if (sym2)
1079                 goto out;
1080
1081         for (prop = sym->prop; prop; prop = prop->next) {
1082                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1083                         continue;
1084                 stack.prop = prop;
1085                 sym2 = sym_check_expr_deps(prop->visible.expr);
1086                 if (sym2)
1087                         break;
1088                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1089                         continue;
1090                 stack.expr = prop->expr;
1091                 sym2 = sym_check_expr_deps(prop->expr);
1092                 if (sym2)
1093                         break;
1094                 stack.expr = NULL;
1095         }
1096
1097 out:
1098         dep_stack_remove();
1099
1100         return sym2;
1101 }
1102
1103 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1104 {
1105         struct symbol *sym, *sym2;
1106         struct property *prop;
1107         struct expr *e;
1108         struct dep_stack stack;
1109
1110         dep_stack_insert(&stack, choice);
1111
1112         prop = sym_get_choice_prop(choice);
1113         expr_list_for_each_sym(prop->expr, e, sym)
1114                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1115
1116         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1117         sym2 = sym_check_sym_deps(choice);
1118         choice->flags &= ~SYMBOL_CHECK;
1119         if (sym2)
1120                 goto out;
1121
1122         expr_list_for_each_sym(prop->expr, e, sym) {
1123                 sym2 = sym_check_sym_deps(sym);
1124                 if (sym2)
1125                         break;
1126         }
1127 out:
1128         expr_list_for_each_sym(prop->expr, e, sym)
1129                 sym->flags &= ~SYMBOL_CHECK;
1130
1131         if (sym2 && sym_is_choice_value(sym2) &&
1132             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1133                 sym2 = choice;
1134
1135         dep_stack_remove();
1136
1137         return sym2;
1138 }
1139
1140 struct symbol *sym_check_deps(struct symbol *sym)
1141 {
1142         struct symbol *sym2;
1143         struct property *prop;
1144
1145         if (sym->flags & SYMBOL_CHECK) {
1146                 sym_check_print_recursive(sym);
1147                 return sym;
1148         }
1149         if (sym->flags & SYMBOL_CHECKED)
1150                 return NULL;
1151
1152         if (sym_is_choice_value(sym)) {
1153                 struct dep_stack stack;
1154
1155                 /* for choice groups start the check with main choice symbol */
1156                 dep_stack_insert(&stack, sym);
1157                 prop = sym_get_choice_prop(sym);
1158                 sym2 = sym_check_deps(prop_get_symbol(prop));
1159                 dep_stack_remove();
1160         } else if (sym_is_choice(sym)) {
1161                 sym2 = sym_check_choice_deps(sym);
1162         } else {
1163                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1164                 sym2 = sym_check_sym_deps(sym);
1165                 sym->flags &= ~SYMBOL_CHECK;
1166         }
1167
1168         if (sym2 && sym2 == sym)
1169                 sym2 = NULL;
1170
1171         return sym2;
1172 }
1173
1174 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1175 {
1176         struct property *prop;
1177         struct property **propp;
1178
1179         prop = malloc(sizeof(*prop));
1180         memset(prop, 0, sizeof(*prop));
1181         prop->type = type;
1182         prop->sym = sym;
1183         prop->file = current_file;
1184         prop->lineno = zconf_lineno();
1185
1186         /* append property to the prop list of symbol */
1187         if (sym) {
1188                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1189                         ;
1190                 *propp = prop;
1191         }
1192
1193         return prop;
1194 }
1195
1196 struct symbol *prop_get_symbol(struct property *prop)
1197 {
1198         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1199                            prop->expr->type == E_LIST))
1200                 return prop->expr->left.sym;
1201         return NULL;
1202 }
1203
1204 const char *prop_get_type_name(enum prop_type type)
1205 {
1206         switch (type) {
1207         case P_PROMPT:
1208                 return "prompt";
1209         case P_ENV:
1210                 return "env";
1211         case P_COMMENT:
1212                 return "comment";
1213         case P_MENU:
1214                 return "menu";
1215         case P_DEFAULT:
1216                 return "default";
1217         case P_CHOICE:
1218                 return "choice";
1219         case P_SELECT:
1220                 return "select";
1221         case P_RANGE:
1222                 return "range";
1223         case P_SYMBOL:
1224                 return "symbol";
1225         case P_UNKNOWN:
1226                 break;
1227         }
1228         return "unknown";
1229 }
1230
1231 static void prop_add_env(const char *env)
1232 {
1233         struct symbol *sym, *sym2;
1234         struct property *prop;
1235         char *p;
1236
1237         sym = current_entry->sym;
1238         sym->flags |= SYMBOL_AUTO;
1239         for_all_properties(sym, prop, P_ENV) {
1240                 sym2 = prop_get_symbol(prop);
1241                 if (strcmp(sym2->name, env))
1242                         menu_warn(current_entry, "redefining environment symbol from %s",
1243                                   sym2->name);
1244                 return;
1245         }
1246
1247         prop = prop_alloc(P_ENV, sym);
1248         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1249
1250         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1251         sym_env_list->right.sym = sym;
1252
1253         p = getenv(env);
1254         if (p)
1255                 sym_add_default(sym, p);
1256         else
1257                 menu_warn(current_entry, "environment variable %s undefined", env);
1258 }