scripts/kconfig/symbol.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <[email protected]>
   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 (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
 354                                 struct expr *e;
 355                                 e = expr_simplify_unmet_dep(sym->rev_dep.expr,
 356                                     sym->dir_dep.expr);
 357                                 fprintf(stderr, "warning: (");
 358                                 expr_fprint(e, stderr);
 359                                 fprintf(stderr, ") selects %s which has unmet direct dependencies (",
 360                                         sym->name);
 361                                 expr_fprint(sym->dir_dep.expr, stderr);
 362                                 fprintf(stderr, ")\n");
 363                                 expr_free(e);
 364                         }
 365                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 366                 }
 367                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 368                         newval.tri = yes;
 369                 break;
 370         case S_STRING:
 371         case S_HEX:
 372         case S_INT:
 373                 if (sym->visible != no) {
 374                         sym->flags |= SYMBOL_WRITE;
 375                         if (sym_has_value(sym)) {
 376                                 newval.val = sym->def[S_DEF_USER].val;
 377                                 break;
 378                         }
 379                 }
 380                 prop = sym_get_default_prop(sym);
 381                 if (prop) {
 382                         struct symbol *ds = prop_get_symbol(prop);
 383                         if (ds) {
 384                                 sym->flags |= SYMBOL_WRITE;
 385                                 sym_calc_value(ds);
 386                                 newval.val = ds->curr.val;
 387                         }
 388                 }
 389                 break;
 390         default:
 391                 ;
 392         }
 393
 394         sym->curr = newval;
 395         if (sym_is_choice(sym) && newval.tri == yes)
 396                 sym->curr.val = sym_calc_choice(sym);
 397         sym_validate_range(sym);
 398
 399         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 400                 sym_set_changed(sym);
 401                 if (modules_sym == sym) {
 402                         sym_set_all_changed();
 403                         modules_val = modules_sym->curr.tri;
 404                 }
 405         }
 406
 407         if (sym_is_choice(sym)) {
 408                 struct symbol *choice_sym;
 409
 410                 prop = sym_get_choice_prop(sym);
 411                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 412                         if ((sym->flags & SYMBOL_WRITE) &&
 413                             choice_sym->visible != no)
 414                                 choice_sym->flags |= SYMBOL_WRITE;
 415                         if (sym->flags & SYMBOL_CHANGED)
 416                                 sym_set_changed(choice_sym);
 417                 }
 418         }
 419
 420         if (sym->flags & SYMBOL_AUTO)
 421                 sym->flags &= ~SYMBOL_WRITE;
 422 }
 423
 424 void sym_clear_all_valid(void)
 425 {
 426         struct symbol *sym;
 427         int i;
 428
 429         for_all_symbols(i, sym)
 430                 sym->flags &= ~SYMBOL_VALID;
 431         sym_add_change_count(1);
 432         if (modules_sym)
 433                 sym_calc_value(modules_sym);
 434 }
 435
 436 void sym_set_changed(struct symbol *sym)
 437 {
 438         struct property *prop;
 439
 440         sym->flags |= SYMBOL_CHANGED;
 441         for (prop = sym->prop; prop; prop = prop->next) {
 442                 if (prop->menu)
 443                         prop->menu->flags |= MENU_CHANGED;
 444         }
 445 }
 446
 447 void sym_set_all_changed(void)
 448 {
 449         struct symbol *sym;
 450         int i;
 451
 452         for_all_symbols(i, sym)
 453                 sym_set_changed(sym);
 454 }
 455
 456 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 457 {
 458         int type = sym_get_type(sym);
 459
 460         if (sym->visible == no)
 461                 return false;
 462
 463         if (type != S_BOOLEAN && type != S_TRISTATE)
 464                 return false;
 465
 466         if (type == S_BOOLEAN && val == mod)
 467                 return false;
 468         if (sym->visible <= sym->rev_dep.tri)
 469                 return false;
 470         if (sym_is_choice_value(sym) && sym->visible == yes)
 471                 return val == yes;
 472         return val >= sym->rev_dep.tri && val <= sym->visible;
 473 }
 474
 475 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 476 {
 477         tristate oldval = sym_get_tristate_value(sym);
 478
 479         if (oldval != val && !sym_tristate_within_range(sym, val))
 480                 return false;
 481
 482         if (!(sym->flags & SYMBOL_DEF_USER)) {
 483                 sym->flags |= SYMBOL_DEF_USER;
 484                 sym_set_changed(sym);
 485         }
 486         /*
 487          * setting a choice value also resets the new flag of the choice
 488          * symbol and all other choice values.
 489          */
 490         if (sym_is_choice_value(sym) && val == yes) {
 491                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 492                 struct property *prop;
 493                 struct expr *e;
 494
 495                 cs->def[S_DEF_USER].val = sym;
 496                 cs->flags |= SYMBOL_DEF_USER;
 497                 prop = sym_get_choice_prop(cs);
 498                 for (e = prop->expr; e; e = e->left.expr) {
 499                         if (e->right.sym->visible != no)
 500                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 501                 }
 502         }
 503
 504         sym->def[S_DEF_USER].tri = val;
 505         if (oldval != val)
 506                 sym_clear_all_valid();
 507
 508         return true;
 509 }
 510
 511 tristate sym_toggle_tristate_value(struct symbol *sym)
 512 {
 513         tristate oldval, newval;
 514
 515         oldval = newval = sym_get_tristate_value(sym);
 516         do {
 517                 switch (newval) {
 518                 case no:
 519                         newval = mod;
 520                         break;
 521                 case mod:
 522                         newval = yes;
 523                         break;
 524                 case yes:
 525                         newval = no;
 526                         break;
 527                 }
 528                 if (sym_set_tristate_value(sym, newval))
 529                         break;
 530         } while (oldval != newval);
 531         return newval;
 532 }
 533
 534 bool sym_string_valid(struct symbol *sym, const char *str)
 535 {
 536         signed char ch;
 537
 538         switch (sym->type) {
 539         case S_STRING:
 540                 return true;
 541         case S_INT:
 542                 ch = *str++;
 543                 if (ch == '-')
 544                         ch = *str++;
 545                 if (!isdigit(ch))
 546                         return false;
 547                 if (ch == '0' && *str != 0)
 548                         return false;
 549                 while ((ch = *str++)) {
 550                         if (!isdigit(ch))
 551                                 return false;
 552                 }
 553                 return true;
 554         case S_HEX:
 555                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 556                         str += 2;
 557                 ch = *str++;
 558                 do {
 559                         if (!isxdigit(ch))
 560                                 return false;
 561                 } while ((ch = *str++));
 562                 return true;
 563         case S_BOOLEAN:
 564         case S_TRISTATE:
 565                 switch (str[0]) {
 566                 case 'y': case 'Y':
 567                 case 'm': case 'M':
 568                 case 'n': case 'N':
 569                         return true;
 570                 }
 571                 return false;
 572         default:
 573                 return false;
 574         }
 575 }
 576
 577 bool sym_string_within_range(struct symbol *sym, const char *str)
 578 {
 579         struct property *prop;
 580         int val;
 581
 582         switch (sym->type) {
 583         case S_STRING:
 584                 return sym_string_valid(sym, str);
 585         case S_INT:
 586                 if (!sym_string_valid(sym, str))
 587                         return false;
 588                 prop = sym_get_range_prop(sym);
 589                 if (!prop)
 590                         return true;
 591                 val = strtol(str, NULL, 10);
 592                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 593                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 594         case S_HEX:
 595                 if (!sym_string_valid(sym, str))
 596                         return false;
 597                 prop = sym_get_range_prop(sym);
 598                 if (!prop)
 599                         return true;
 600                 val = strtol(str, NULL, 16);
 601                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 602                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 603         case S_BOOLEAN:
 604         case S_TRISTATE:
 605                 switch (str[0]) {
 606                 case 'y': case 'Y':
 607                         return sym_tristate_within_range(sym, yes);
 608                 case 'm': case 'M':
 609                         return sym_tristate_within_range(sym, mod);
 610                 case 'n': case 'N':
 611                         return sym_tristate_within_range(sym, no);
 612                 }
 613                 return false;
 614         default:
 615                 return false;
 616         }
 617 }
 618
 619 bool sym_set_string_value(struct symbol *sym, const char *newval)
 620 {
 621         const char *oldval;
 622         char *val;
 623         int size;
 624
 625         switch (sym->type) {
 626         case S_BOOLEAN:
 627         case S_TRISTATE:
 628                 switch (newval[0]) {
 629                 case 'y': case 'Y':
 630                         return sym_set_tristate_value(sym, yes);
 631                 case 'm': case 'M':
 632                         return sym_set_tristate_value(sym, mod);
 633                 case 'n': case 'N':
 634                         return sym_set_tristate_value(sym, no);
 635                 }
 636                 return false;
 637         default:
 638                 ;
 639         }
 640
 641         if (!sym_string_within_range(sym, newval))
 642                 return false;
 643
 644         if (!(sym->flags & SYMBOL_DEF_USER)) {
 645                 sym->flags |= SYMBOL_DEF_USER;
 646                 sym_set_changed(sym);
 647         }
 648
 649         oldval = sym->def[S_DEF_USER].val;
 650         size = strlen(newval) + 1;
 651         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 652                 size += 2;
 653                 sym->def[S_DEF_USER].val = val = malloc(size);
 654                 *val++ = '0';
 655                 *val++ = 'x';
 656         } else if (!oldval || strcmp(oldval, newval))
 657                 sym->def[S_DEF_USER].val = val = malloc(size);
 658         else
 659                 return true;
 660
 661         strcpy(val, newval);
 662         free((void *)oldval);
 663         sym_clear_all_valid();
 664
 665         return true;
 666 }
 667
 668 /*
 669  * Find the default value associated to a symbol.
 670  * For tristate symbol handle the modules=n case
 671  * in which case "m" becomes "y".
 672  * If the symbol does not have any default then fallback
 673  * to the fixed default values.
 674  */
 675 const char *sym_get_string_default(struct symbol *sym)
 676 {
 677         struct property *prop;
 678         struct symbol *ds;
 679         const char *str;
 680         tristate val;
 681
 682         sym_calc_visibility(sym);
 683         sym_calc_value(modules_sym);
 684         val = symbol_no.curr.tri;
 685         str = symbol_empty.curr.val;
 686
 687         /* If symbol has a default value look it up */
 688         prop = sym_get_default_prop(sym);
 689         if (prop != NULL) {
 690                 switch (sym->type) {
 691                 case S_BOOLEAN:
 692                 case S_TRISTATE:
 693                         /* The visibility may limit the value from yes => mod */
 694                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 695                         break;
 696                 default:
 697                         /*
 698                          * The following fails to handle the situation
 699                          * where a default value is further limited by
 700                          * the valid range.
 701                          */
 702                         ds = prop_get_symbol(prop);
 703                         if (ds != NULL) {
 704                                 sym_calc_value(ds);
 705                                 str = (const char *)ds->curr.val;
 706                         }
 707                 }
 708         }
 709
 710         /* Handle select statements */
 711         val = EXPR_OR(val, sym->rev_dep.tri);
 712
 713         /* transpose mod to yes if modules are not enabled */
 714         if (val == mod)
 715                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 716                         val = yes;
 717
 718         /* transpose mod to yes if type is bool */
 719         if (sym->type == S_BOOLEAN && val == mod)
 720                 val = yes;
 721
 722         switch (sym->type) {
 723         case S_BOOLEAN:
 724         case S_TRISTATE:
 725                 switch (val) {
 726                 case no: return "n";
 727                 case mod: return "m";
 728                 case yes: return "y";
 729                 }
 730         case S_INT:
 731         case S_HEX:
 732                 return str;
 733         case S_STRING:
 734                 return str;
 735         case S_OTHER:
 736         case S_UNKNOWN:
 737                 break;
 738         }
 739         return "";
 740 }
 741
 742 const char *sym_get_string_value(struct symbol *sym)
 743 {
 744         tristate val;
 745
 746         switch (sym->type) {
 747         case S_BOOLEAN:
 748         case S_TRISTATE:
 749                 val = sym_get_tristate_value(sym);
 750                 switch (val) {
 751                 case no:
 752                         return "n";
 753                 case mod:
 754                         return "m";
 755                 case yes:
 756                         return "y";
 757                 }
 758                 break;
 759         default:
 760                 ;
 761         }
 762         return (const char *)sym->curr.val;
 763 }
 764
 765 bool sym_is_changable(struct symbol *sym)
 766 {
 767         return sym->visible > sym->rev_dep.tri;
 768 }
 769
 770 static unsigned strhash(const char *s)
 771 {
 772         /* fnv32 hash */
 773         unsigned hash = 2166136261U;
 774         for (; *s; s++)
 775                 hash = (hash ^ *s) * 0x01000193;
 776         return hash;
 777 }
 778
 779 struct symbol *sym_lookup(const char *name, int flags)
 780 {
 781         struct symbol *symbol;
 782         char *new_name;
 783         int hash;
 784
 785         if (name) {
 786                 if (name[0] && !name[1]) {
 787                         switch (name[0]) {
 788                         case 'y': return &symbol_yes;
 789                         case 'm': return &symbol_mod;
 790                         case 'n': return &symbol_no;
 791                         }
 792                 }
 793                 hash = strhash(name) % SYMBOL_HASHSIZE;
 794
 795                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 796                         if (symbol->name &&
 797                             !strcmp(symbol->name, name) &&
 798                             (flags ? symbol->flags & flags
 799                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 800                                 return symbol;
 801                 }
 802                 new_name = strdup(name);
 803         } else {
 804                 new_name = NULL;
 805                 hash = 0;
 806         }
 807
 808         symbol = malloc(sizeof(*symbol));
 809         memset(symbol, 0, sizeof(*symbol));
 810         symbol->name = new_name;
 811         symbol->type = S_UNKNOWN;
 812         symbol->flags |= flags;
 813
 814         symbol->next = symbol_hash[hash];
 815         symbol_hash[hash] = symbol;
 816
 817         return symbol;
 818 }
 819
 820 struct symbol *sym_find(const char *name)
 821 {
 822         struct symbol *symbol = NULL;
 823         int hash = 0;
 824
 825         if (!name)
 826                 return NULL;
 827
 828         if (name[0] && !name[1]) {
 829                 switch (name[0]) {
 830                 case 'y': return &symbol_yes;
 831                 case 'm': return &symbol_mod;
 832                 case 'n': return &symbol_no;
 833                 }
 834         }
 835         hash = strhash(name) % SYMBOL_HASHSIZE;
 836
 837         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 838                 if (symbol->name &&
 839                     !strcmp(symbol->name, name) &&
 840                     !(symbol->flags & SYMBOL_CONST))
 841                                 break;
 842         }
 843
 844         return symbol;
 845 }
 846
 847 /*
 848  * Expand symbol's names embedded in the string given in argument. Symbols'
 849  * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
 850  * the empty string.
 851  */
 852 const char *sym_expand_string_value(const char *in)
 853 {
 854         const char *src;
 855         char *res;
 856         size_t reslen;
 857
 858         reslen = strlen(in) + 1;
 859         res = malloc(reslen);
 860         res[0] = '\0';
 861
 862         while ((src = strchr(in, '$'))) {
 863                 char *p, name[SYMBOL_MAXLENGTH];
 864                 const char *symval = "";
 865                 struct symbol *sym;
 866                 size_t newlen;
 867
 868                 strncat(res, in, src - in);
 869                 src++;
 870
 871                 p = name;
 872                 while (isalnum(*src) || *src == '_')
 873                         *p++ = *src++;
 874                 *p = '\0';
 875
 876                 sym = sym_find(name);
 877                 if (sym != NULL) {
 878                         sym_calc_value(sym);
 879                         symval = sym_get_string_value(sym);
 880                 }
 881
 882                 newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
 883                 if (newlen > reslen) {
 884                         reslen = newlen;
 885                         res = realloc(res, reslen);
 886                 }
 887
 888                 strcat(res, symval);
 889                 in = src;
 890         }
 891         strcat(res, in);
 892
 893         return res;
 894 }
 895
 896 struct symbol **sym_re_search(const char *pattern)
 897 {
 898         struct symbol *sym, **sym_arr = NULL;
 899         int i, cnt, size;
 900         regex_t re;
 901
 902         cnt = size = 0;
 903         /* Skip if empty */
 904         if (strlen(pattern) == 0)
 905                 return NULL;
 906         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 907                 return NULL;
 908
 909         for_all_symbols(i, sym) {
 910                 if (sym->flags & SYMBOL_CONST || !sym->name)
 911                         continue;
 912                 if (regexec(&re, sym->name, 0, NULL, 0))
 913                         continue;
 914                 if (cnt + 1 >= size) {
 915                         void *tmp = sym_arr;
 916                         size += 16;
 917                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 918                         if (!sym_arr) {
 919                                 free(tmp);
 920                                 return NULL;
 921                         }
 922                 }
 923                 sym_calc_value(sym);
 924                 sym_arr[cnt++] = sym;
 925         }
 926         if (sym_arr)
 927                 sym_arr[cnt] = NULL;
 928         regfree(&re);
 929
 930         return sym_arr;
 931 }
 932
 933 /*
 934  * When we check for recursive dependencies we use a stack to save
 935  * current state so we can print out relevant info to user.
 936  * The entries are located on the call stack so no need to free memory.
 937  * Note inser() remove() must always match to properly clear the stack.
 938  */
 939 static struct dep_stack {
 940         struct dep_stack *prev, *next;
 941         struct symbol *sym;
 942         struct property *prop;
 943         struct expr *expr;
 944 } *check_top;
 945
 946 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
 947 {
 948         memset(stack, 0, sizeof(*stack));
 949         if (check_top)
 950                 check_top->next = stack;
 951         stack->prev = check_top;
 952         stack->sym = sym;
 953         check_top = stack;
 954 }
 955
 956 static void dep_stack_remove(void)
 957 {
 958         check_top = check_top->prev;
 959         if (check_top)
 960                 check_top->next = NULL;
 961 }
 962
 963 /*
 964  * Called when we have detected a recursive dependency.
 965  * check_top point to the top of the stact so we use
 966  * the ->prev pointer to locate the bottom of the stack.
 967  */
 968 static void sym_check_print_recursive(struct symbol *last_sym)
 969 {
 970         struct dep_stack *stack;
 971         struct symbol *sym, *next_sym;
 972         struct menu *menu = NULL;
 973         struct property *prop;
 974         struct dep_stack cv_stack;
 975
 976         if (sym_is_choice_value(last_sym)) {
 977                 dep_stack_insert(&cv_stack, last_sym);
 978                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
 979         }
 980
 981         for (stack = check_top; stack != NULL; stack = stack->prev)
 982                 if (stack->sym == last_sym)
 983                         break;
 984         if (!stack) {
 985                 fprintf(stderr, "unexpected recursive dependency error\n");
 986                 return;
 987         }
 988
 989         for (; stack; stack = stack->next) {
 990                 sym = stack->sym;
 991                 next_sym = stack->next ? stack->next->sym : last_sym;
 992                 prop = stack->prop;
 993                 if (prop == NULL)
 994                         prop = stack->sym->prop;
 995
 996                 /* for choice values find the menu entry (used below) */
 997                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
 998                         for (prop = sym->prop; prop; prop = prop->next) {
 999                                 menu = prop->menu;
1000                                 if (prop->menu)
1001                                         break;
1002                         }
1003                 }
1004                 if (stack->sym == last_sym)
1005                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1006                                 prop->file->name, prop->lineno);
1007                 if (stack->expr) {
1008                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1009                                 prop->file->name, prop->lineno,
1010                                 sym->name ? sym->name : "<choice>",
1011                                 prop_get_type_name(prop->type),
1012                                 next_sym->name ? next_sym->name : "<choice>");
1013                 } else if (stack->prop) {
1014                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1015                                 prop->file->name, prop->lineno,
1016                                 sym->name ? sym->name : "<choice>",
1017                                 next_sym->name ? next_sym->name : "<choice>");
1018                 } else if (sym_is_choice(sym)) {
1019                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1020                                 menu->file->name, menu->lineno,
1021                                 sym->name ? sym->name : "<choice>",
1022                                 next_sym->name ? next_sym->name : "<choice>");
1023                 } else if (sym_is_choice_value(sym)) {
1024                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1025                                 menu->file->name, menu->lineno,
1026                                 sym->name ? sym->name : "<choice>",
1027                                 next_sym->name ? next_sym->name : "<choice>");
1028                 } else {
1029                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1030                                 prop->file->name, prop->lineno,
1031                                 sym->name ? sym->name : "<choice>",
1032                                 next_sym->name ? next_sym->name : "<choice>");
1033                 }
1034         }
1035
1036         if (check_top == &cv_stack)
1037                 dep_stack_remove();
1038 }
1039
1040 static struct symbol *sym_check_expr_deps(struct expr *e)
1041 {
1042         struct symbol *sym;
1043
1044         if (!e)
1045                 return NULL;
1046         switch (e->type) {
1047         case E_OR:
1048         case E_AND:
1049                 sym = sym_check_expr_deps(e->left.expr);
1050                 if (sym)
1051                         return sym;
1052                 return sym_check_expr_deps(e->right.expr);
1053         case E_NOT:
1054                 return sym_check_expr_deps(e->left.expr);
1055         case E_EQUAL:
1056         case E_UNEQUAL:
1057                 sym = sym_check_deps(e->left.sym);
1058                 if (sym)
1059                         return sym;
1060                 return sym_check_deps(e->right.sym);
1061         case E_SYMBOL:
1062                 return sym_check_deps(e->left.sym);
1063         default:
1064                 break;
1065         }
1066         printf("Oops! How to check %d?\n", e->type);
1067         return NULL;
1068 }
1069
1070 /* return NULL when dependencies are OK */
1071 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1072 {
1073         struct symbol *sym2;
1074         struct property *prop;
1075         struct dep_stack stack;
1076
1077         dep_stack_insert(&stack, sym);
1078
1079         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1080         if (sym2)
1081                 goto out;
1082
1083         for (prop = sym->prop; prop; prop = prop->next) {
1084                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1085                         continue;
1086                 stack.prop = prop;
1087                 sym2 = sym_check_expr_deps(prop->visible.expr);
1088                 if (sym2)
1089                         break;
1090                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1091                         continue;
1092                 stack.expr = prop->expr;
1093                 sym2 = sym_check_expr_deps(prop->expr);
1094                 if (sym2)
1095                         break;
1096                 stack.expr = NULL;
1097         }
1098
1099 out:
1100         dep_stack_remove();
1101
1102         return sym2;
1103 }
1104
1105 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1106 {
1107         struct symbol *sym, *sym2;
1108         struct property *prop;
1109         struct expr *e;
1110         struct dep_stack stack;
1111
1112         dep_stack_insert(&stack, choice);
1113
1114         prop = sym_get_choice_prop(choice);
1115         expr_list_for_each_sym(prop->expr, e, sym)
1116                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1117
1118         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1119         sym2 = sym_check_sym_deps(choice);
1120         choice->flags &= ~SYMBOL_CHECK;
1121         if (sym2)
1122                 goto out;
1123
1124         expr_list_for_each_sym(prop->expr, e, sym) {
1125                 sym2 = sym_check_sym_deps(sym);
1126                 if (sym2)
1127                         break;
1128         }
1129 out:
1130         expr_list_for_each_sym(prop->expr, e, sym)
1131                 sym->flags &= ~SYMBOL_CHECK;
1132
1133         if (sym2 && sym_is_choice_value(sym2) &&
1134             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1135                 sym2 = choice;
1136
1137         dep_stack_remove();
1138
1139         return sym2;
1140 }
1141
1142 struct symbol *sym_check_deps(struct symbol *sym)
1143 {
1144         struct symbol *sym2;
1145         struct property *prop;
1146
1147         if (sym->flags & SYMBOL_CHECK) {
1148                 sym_check_print_recursive(sym);
1149                 return sym;
1150         }
1151         if (sym->flags & SYMBOL_CHECKED)
1152                 return NULL;
1153
1154         if (sym_is_choice_value(sym)) {
1155                 struct dep_stack stack;
1156
1157                 /* for choice groups start the check with main choice symbol */
1158                 dep_stack_insert(&stack, sym);
1159                 prop = sym_get_choice_prop(sym);
1160                 sym2 = sym_check_deps(prop_get_symbol(prop));
1161                 dep_stack_remove();
1162         } else if (sym_is_choice(sym)) {
1163                 sym2 = sym_check_choice_deps(sym);
1164         } else {
1165                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1166                 sym2 = sym_check_sym_deps(sym);
1167                 sym->flags &= ~SYMBOL_CHECK;
1168         }
1169
1170         if (sym2 && sym2 == sym)
1171                 sym2 = NULL;
1172
1173         return sym2;
1174 }
1175
1176 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1177 {
1178         struct property *prop;
1179         struct property **propp;
1180
1181         prop = malloc(sizeof(*prop));
1182         memset(prop, 0, sizeof(*prop));
1183         prop->type = type;
1184         prop->sym = sym;
1185         prop->file = current_file;
1186         prop->lineno = zconf_lineno();
1187
1188         /* append property to the prop list of symbol */
1189         if (sym) {
1190                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1191                         ;
1192                 *propp = prop;
1193         }
1194
1195         return prop;
1196 }
1197
1198 struct symbol *prop_get_symbol(struct property *prop)
1199 {
1200         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1201                            prop->expr->type == E_LIST))
1202                 return prop->expr->left.sym;
1203         return NULL;
1204 }
1205
1206 const char *prop_get_type_name(enum prop_type type)
1207 {
1208         switch (type) {
1209         case P_PROMPT:
1210                 return "prompt";
1211         case P_ENV:
1212                 return "env";
1213         case P_COMMENT:
1214                 return "comment";
1215         case P_MENU:
1216                 return "menu";
1217         case P_DEFAULT:
1218                 return "default";
1219         case P_CHOICE:
1220                 return "choice";
1221         case P_SELECT:
1222                 return "select";
1223         case P_RANGE:
1224                 return "range";
1225         case P_SYMBOL:
1226                 return "symbol";
1227         case P_UNKNOWN:
1228                 break;
1229         }
1230         return "unknown";
1231 }
1232
1233 static void prop_add_env(const char *env)
1234 {
1235         struct symbol *sym, *sym2;
1236         struct property *prop;
1237         char *p;
1238
1239         sym = current_entry->sym;
1240         sym->flags |= SYMBOL_AUTO;
1241         for_all_properties(sym, prop, P_ENV) {
1242                 sym2 = prop_get_symbol(prop);
1243                 if (strcmp(sym2->name, env))
1244                         menu_warn(current_entry, "redefining environment symbol from %s",
1245                                   sym2->name);
1246                 return;
1247         }
1248
1249         prop = prop_alloc(P_ENV, sym);
1250         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1251
1252         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1253         sym_env_list->right.sym = sym;
1254
1255         p = getenv(env);
1256         if (p)
1257                 sym_add_default(sym, p);
1258         else
1259                 menu_warn(current_entry, "environment variable %s undefined", env);
1260 }