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 #include "lkc.h"
  13
  14 struct symbol symbol_yes = {
  15         .name = "y",
  16         .curr = { "y", yes },
  17         .flags = SYMBOL_CONST|SYMBOL_VALID,
  18 }, symbol_mod = {
  19         .name = "m",
  20         .curr = { "m", mod },
  21         .flags = SYMBOL_CONST|SYMBOL_VALID,
  22 }, symbol_no = {
  23         .name = "n",
  24         .curr = { "n", no },
  25         .flags = SYMBOL_CONST|SYMBOL_VALID,
  26 }, symbol_empty = {
  27         .name = "",
  28         .curr = { "", no },
  29         .flags = SYMBOL_VALID,
  30 };
  31
  32 struct symbol *sym_defconfig_list;
  33 struct symbol *modules_sym;
  34 tristate modules_val;
  35
  36 struct expr *sym_env_list;
  37
  38 static void sym_add_default(struct symbol *sym, const char *def)
  39 {
  40         struct property *prop = prop_alloc(P_DEFAULT, sym);
  41
  42         prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));
  43 }
  44
  45 void sym_init(void)
  46 {
  47         struct symbol *sym;
  48         struct utsname uts;
  49         static bool inited = false;
  50
  51         if (inited)
  52                 return;
  53         inited = true;
  54
  55         uname(&uts);
  56
  57         sym = sym_lookup("UNAME_RELEASE", 0);
  58         sym->type = S_STRING;
  59         sym->flags |= SYMBOL_AUTO;
  60         sym_add_default(sym, uts.release);
  61 }
  62
  63 enum symbol_type sym_get_type(struct symbol *sym)
  64 {
  65         enum symbol_type type = sym->type;
  66
  67         if (type == S_TRISTATE) {
  68                 if (sym_is_choice_value(sym) && sym->visible == yes)
  69                         type = S_BOOLEAN;
  70                 else if (modules_val == no)
  71                         type = S_BOOLEAN;
  72         }
  73         return type;
  74 }
  75
  76 const char *sym_type_name(enum symbol_type type)
  77 {
  78         switch (type) {
  79         case S_BOOLEAN:
  80                 return "boolean";
  81         case S_TRISTATE:
  82                 return "tristate";
  83         case S_INT:
  84                 return "integer";
  85         case S_HEX:
  86                 return "hex";
  87         case S_STRING:
  88                 return "string";
  89         case S_UNKNOWN:
  90                 return "unknown";
  91         case S_OTHER:
  92                 break;
  93         }
  94         return "???";
  95 }
  96
  97 struct property *sym_get_choice_prop(struct symbol *sym)
  98 {
  99         struct property *prop;
 100
 101         for_all_choices(sym, prop)
 102                 return prop;
 103         return NULL;
 104 }
 105
 106 struct property *sym_get_env_prop(struct symbol *sym)
 107 {
 108         struct property *prop;
 109
 110         for_all_properties(sym, prop, P_ENV)
 111                 return prop;
 112         return NULL;
 113 }
 114
 115 struct property *sym_get_default_prop(struct symbol *sym)
 116 {
 117         struct property *prop;
 118
 119         for_all_defaults(sym, prop) {
 120                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 121                 if (prop->visible.tri != no)
 122                         return prop;
 123         }
 124         return NULL;
 125 }
 126
 127 static struct property *sym_get_range_prop(struct symbol *sym)
 128 {
 129         struct property *prop;
 130
 131         for_all_properties(sym, prop, P_RANGE) {
 132                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 133                 if (prop->visible.tri != no)
 134                         return prop;
 135         }
 136         return NULL;
 137 }
 138
 139 static int sym_get_range_val(struct symbol *sym, int base)
 140 {
 141         sym_calc_value(sym);
 142         switch (sym->type) {
 143         case S_INT:
 144                 base = 10;
 145                 break;
 146         case S_HEX:
 147                 base = 16;
 148                 break;
 149         default:
 150                 break;
 151         }
 152         return strtol(sym->curr.val, NULL, base);
 153 }
 154
 155 static void sym_validate_range(struct symbol *sym)
 156 {
 157         struct property *prop;
 158         int base, val, val2;
 159         char str[64];
 160
 161         switch (sym->type) {
 162         case S_INT:
 163                 base = 10;
 164                 break;
 165         case S_HEX:
 166                 base = 16;
 167                 break;
 168         default:
 169                 return;
 170         }
 171         prop = sym_get_range_prop(sym);
 172         if (!prop)
 173                 return;
 174         val = strtol(sym->curr.val, NULL, base);
 175         val2 = sym_get_range_val(prop->expr->left.sym, base);
 176         if (val >= val2) {
 177                 val2 = sym_get_range_val(prop->expr->right.sym, base);
 178                 if (val <= val2)
 179                         return;
 180         }
 181         if (sym->type == S_INT)
 182                 sprintf(str, "%d", val2);
 183         else
 184                 sprintf(str, "0x%x", val2);
 185         sym->curr.val = strdup(str);
 186 }
 187
 188 static void sym_calc_visibility(struct symbol *sym)
 189 {
 190         struct property *prop;
 191         tristate tri;
 192
 193         /* any prompt visible? */
 194         tri = no;
 195         for_all_prompts(sym, prop) {
 196                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 197                 tri = EXPR_OR(tri, prop->visible.tri);
 198         }
 199         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 200                 tri = yes;
 201         if (sym->visible != tri) {
 202                 sym->visible = tri;
 203                 sym_set_changed(sym);
 204         }
 205         if (sym_is_choice_value(sym))
 206                 return;
 207         /* defaulting to "yes" if no explicit "depends on" are given */
 208         tri = yes;
 209         if (sym->dir_dep.expr)
 210                 tri = expr_calc_value(sym->dir_dep.expr);
 211         if (tri == mod)
 212                 tri = yes;
 213         if (sym->dir_dep.tri != tri) {
 214                 sym->dir_dep.tri = tri;
 215                 sym_set_changed(sym);
 216         }
 217         tri = no;
 218         if (sym->rev_dep.expr)
 219                 tri = expr_calc_value(sym->rev_dep.expr);
 220         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 221                 tri = yes;
 222         if (sym->rev_dep.tri != tri) {
 223                 sym->rev_dep.tri = tri;
 224                 sym_set_changed(sym);
 225         }
 226 }
 227
 228 /*
 229  * Find the default symbol for a choice.
 230  * First try the default values for the choice symbol
 231  * Next locate the first visible choice value
 232  * Return NULL if none was found
 233  */
 234 struct symbol *sym_choice_default(struct symbol *sym)
 235 {
 236         struct symbol *def_sym;
 237         struct property *prop;
 238         struct expr *e;
 239
 240         /* any of the defaults visible? */
 241         for_all_defaults(sym, prop) {
 242                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 243                 if (prop->visible.tri == no)
 244                         continue;
 245                 def_sym = prop_get_symbol(prop);
 246                 if (def_sym->visible != no)
 247                         return def_sym;
 248         }
 249
 250         /* just get the first visible value */
 251         prop = sym_get_choice_prop(sym);
 252         expr_list_for_each_sym(prop->expr, e, def_sym)
 253                 if (def_sym->visible != no)
 254                         return def_sym;
 255
 256         /* failed to locate any defaults */
 257         return NULL;
 258 }
 259
 260 static struct symbol *sym_calc_choice(struct symbol *sym)
 261 {
 262         struct symbol *def_sym;
 263         struct property *prop;
 264         struct expr *e;
 265         int flags;
 266
 267         /* first calculate all choice values' visibilities */
 268         flags = sym->flags;
 269         prop = sym_get_choice_prop(sym);
 270         expr_list_for_each_sym(prop->expr, e, def_sym) {
 271                 sym_calc_visibility(def_sym);
 272                 if (def_sym->visible != no)
 273                         flags &= def_sym->flags;
 274         }
 275
 276         sym->flags &= flags | ~SYMBOL_DEF_USER;
 277
 278         /* is the user choice visible? */
 279         def_sym = sym->def[S_DEF_USER].val;
 280         if (def_sym && def_sym->visible != no)
 281                 return def_sym;
 282
 283         def_sym = sym_choice_default(sym);
 284
 285         if (def_sym == NULL)
 286                 /* no choice? reset tristate value */
 287                 sym->curr.tri = no;
 288
 289         return def_sym;
 290 }
 291
 292 void sym_calc_value(struct symbol *sym)
 293 {
 294         struct symbol_value newval, oldval;
 295         struct property *prop;
 296         struct expr *e;
 297
 298         if (!sym)
 299                 return;
 300
 301         if (sym->flags & SYMBOL_VALID)
 302                 return;
 303         sym->flags |= SYMBOL_VALID;
 304
 305         oldval = sym->curr;
 306
 307         switch (sym->type) {
 308         case S_INT:
 309         case S_HEX:
 310         case S_STRING:
 311                 newval = symbol_empty.curr;
 312                 break;
 313         case S_BOOLEAN:
 314         case S_TRISTATE:
 315                 newval = symbol_no.curr;
 316                 break;
 317         default:
 318                 sym->curr.val = sym->name;
 319                 sym->curr.tri = no;
 320                 return;
 321         }
 322         if (!sym_is_choice_value(sym))
 323                 sym->flags &= ~SYMBOL_WRITE;
 324
 325         sym_calc_visibility(sym);
 326
 327         /* set default if recursively called */
 328         sym->curr = newval;
 329
 330         switch (sym_get_type(sym)) {
 331         case S_BOOLEAN:
 332         case S_TRISTATE:
 333                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 334                         prop = sym_get_choice_prop(sym);
 335                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 336                 } else {
 337                         if (sym->visible != no) {
 338                                 /* if the symbol is visible use the user value
 339                                  * if available, otherwise try the default value
 340                                  */
 341                                 sym->flags |= SYMBOL_WRITE;
 342                                 if (sym_has_value(sym)) {
 343                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 344                                                               sym->visible);
 345                                         goto calc_newval;
 346                                 }
 347                         }
 348                         if (sym->rev_dep.tri != no)
 349                                 sym->flags |= SYMBOL_WRITE;
 350                         if (!sym_is_choice(sym)) {
 351                                 prop = sym_get_default_prop(sym);
 352                                 if (prop) {
 353                                         sym->flags |= SYMBOL_WRITE;
 354                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 355                                                               prop->visible.tri);
 356                                 }
 357                         }
 358                 calc_newval:
 359                         if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
 360                                 struct expr *e;
 361                                 e = expr_simplify_unmet_dep(sym->rev_dep.expr,
 362                                     sym->dir_dep.expr);
 363                                 fprintf(stderr, "warning: (");
 364                                 expr_fprint(e, stderr);
 365                                 fprintf(stderr, ") selects %s which has unmet direct dependencies (",
 366                                         sym->name);
 367                                 expr_fprint(sym->dir_dep.expr, stderr);
 368                                 fprintf(stderr, ")\n");
 369                                 expr_free(e);
 370                         }
 371                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 372                 }
 373                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 374                         newval.tri = yes;
 375                 break;
 376         case S_STRING:
 377         case S_HEX:
 378         case S_INT:
 379                 if (sym->visible != no) {
 380                         sym->flags |= SYMBOL_WRITE;
 381                         if (sym_has_value(sym)) {
 382                                 newval.val = sym->def[S_DEF_USER].val;
 383                                 break;
 384                         }
 385                 }
 386                 prop = sym_get_default_prop(sym);
 387                 if (prop) {
 388                         struct symbol *ds = prop_get_symbol(prop);
 389                         if (ds) {
 390                                 sym->flags |= SYMBOL_WRITE;
 391                                 sym_calc_value(ds);
 392                                 newval.val = ds->curr.val;
 393                         }
 394                 }
 395                 break;
 396         default:
 397                 ;
 398         }
 399
 400         sym->curr = newval;
 401         if (sym_is_choice(sym) && newval.tri == yes)
 402                 sym->curr.val = sym_calc_choice(sym);
 403         sym_validate_range(sym);
 404
 405         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 406                 sym_set_changed(sym);
 407                 if (modules_sym == sym) {
 408                         sym_set_all_changed();
 409                         modules_val = modules_sym->curr.tri;
 410                 }
 411         }
 412
 413         if (sym_is_choice(sym)) {
 414                 struct symbol *choice_sym;
 415
 416                 prop = sym_get_choice_prop(sym);
 417                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 418                         if ((sym->flags & SYMBOL_WRITE) &&
 419                             choice_sym->visible != no)
 420                                 choice_sym->flags |= SYMBOL_WRITE;
 421                         if (sym->flags & SYMBOL_CHANGED)
 422                                 sym_set_changed(choice_sym);
 423                 }
 424         }
 425
 426         if (sym->flags & SYMBOL_AUTO)
 427                 sym->flags &= ~SYMBOL_WRITE;
 428 }
 429
 430 void sym_clear_all_valid(void)
 431 {
 432         struct symbol *sym;
 433         int i;
 434
 435         for_all_symbols(i, sym)
 436                 sym->flags &= ~SYMBOL_VALID;
 437         sym_add_change_count(1);
 438         if (modules_sym)
 439                 sym_calc_value(modules_sym);
 440 }
 441
 442 void sym_set_changed(struct symbol *sym)
 443 {
 444         struct property *prop;
 445
 446         sym->flags |= SYMBOL_CHANGED;
 447         for (prop = sym->prop; prop; prop = prop->next) {
 448                 if (prop->menu)
 449                         prop->menu->flags |= MENU_CHANGED;
 450         }
 451 }
 452
 453 void sym_set_all_changed(void)
 454 {
 455         struct symbol *sym;
 456         int i;
 457
 458         for_all_symbols(i, sym)
 459                 sym_set_changed(sym);
 460 }
 461
 462 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 463 {
 464         int type = sym_get_type(sym);
 465
 466         if (sym->visible == no)
 467                 return false;
 468
 469         if (type != S_BOOLEAN && type != S_TRISTATE)
 470                 return false;
 471
 472         if (type == S_BOOLEAN && val == mod)
 473                 return false;
 474         if (sym->visible <= sym->rev_dep.tri)
 475                 return false;
 476         if (sym_is_choice_value(sym) && sym->visible == yes)
 477                 return val == yes;
 478         return val >= sym->rev_dep.tri && val <= sym->visible;
 479 }
 480
 481 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 482 {
 483         tristate oldval = sym_get_tristate_value(sym);
 484
 485         if (oldval != val && !sym_tristate_within_range(sym, val))
 486                 return false;
 487
 488         if (!(sym->flags & SYMBOL_DEF_USER)) {
 489                 sym->flags |= SYMBOL_DEF_USER;
 490                 sym_set_changed(sym);
 491         }
 492         /*
 493          * setting a choice value also resets the new flag of the choice
 494          * symbol and all other choice values.
 495          */
 496         if (sym_is_choice_value(sym) && val == yes) {
 497                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 498                 struct property *prop;
 499                 struct expr *e;
 500
 501                 cs->def[S_DEF_USER].val = sym;
 502                 cs->flags |= SYMBOL_DEF_USER;
 503                 prop = sym_get_choice_prop(cs);
 504                 for (e = prop->expr; e; e = e->left.expr) {
 505                         if (e->right.sym->visible != no)
 506                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 507                 }
 508         }
 509
 510         sym->def[S_DEF_USER].tri = val;
 511         if (oldval != val)
 512                 sym_clear_all_valid();
 513
 514         return true;
 515 }
 516
 517 tristate sym_toggle_tristate_value(struct symbol *sym)
 518 {
 519         tristate oldval, newval;
 520
 521         oldval = newval = sym_get_tristate_value(sym);
 522         do {
 523                 switch (newval) {
 524                 case no:
 525                         newval = mod;
 526                         break;
 527                 case mod:
 528                         newval = yes;
 529                         break;
 530                 case yes:
 531                         newval = no;
 532                         break;
 533                 }
 534                 if (sym_set_tristate_value(sym, newval))
 535                         break;
 536         } while (oldval != newval);
 537         return newval;
 538 }
 539
 540 bool sym_string_valid(struct symbol *sym, const char *str)
 541 {
 542         signed char ch;
 543
 544         switch (sym->type) {
 545         case S_STRING:
 546                 return true;
 547         case S_INT:
 548                 ch = *str++;
 549                 if (ch == '-')
 550                         ch = *str++;
 551                 if (!isdigit(ch))
 552                         return false;
 553                 if (ch == '0' && *str != 0)
 554                         return false;
 555                 while ((ch = *str++)) {
 556                         if (!isdigit(ch))
 557                                 return false;
 558                 }
 559                 return true;
 560         case S_HEX:
 561                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 562                         str += 2;
 563                 ch = *str++;
 564                 do {
 565                         if (!isxdigit(ch))
 566                                 return false;
 567                 } while ((ch = *str++));
 568                 return true;
 569         case S_BOOLEAN:
 570         case S_TRISTATE:
 571                 switch (str[0]) {
 572                 case 'y': case 'Y':
 573                 case 'm': case 'M':
 574                 case 'n': case 'N':
 575                         return true;
 576                 }
 577                 return false;
 578         default:
 579                 return false;
 580         }
 581 }
 582
 583 bool sym_string_within_range(struct symbol *sym, const char *str)
 584 {
 585         struct property *prop;
 586         int val;
 587
 588         switch (sym->type) {
 589         case S_STRING:
 590                 return sym_string_valid(sym, str);
 591         case S_INT:
 592                 if (!sym_string_valid(sym, str))
 593                         return false;
 594                 prop = sym_get_range_prop(sym);
 595                 if (!prop)
 596                         return true;
 597                 val = strtol(str, NULL, 10);
 598                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 599                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 600         case S_HEX:
 601                 if (!sym_string_valid(sym, str))
 602                         return false;
 603                 prop = sym_get_range_prop(sym);
 604                 if (!prop)
 605                         return true;
 606                 val = strtol(str, NULL, 16);
 607                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 608                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 609         case S_BOOLEAN:
 610         case S_TRISTATE:
 611                 switch (str[0]) {
 612                 case 'y': case 'Y':
 613                         return sym_tristate_within_range(sym, yes);
 614                 case 'm': case 'M':
 615                         return sym_tristate_within_range(sym, mod);
 616                 case 'n': case 'N':
 617                         return sym_tristate_within_range(sym, no);
 618                 }
 619                 return false;
 620         default:
 621                 return false;
 622         }
 623 }
 624
 625 bool sym_set_string_value(struct symbol *sym, const char *newval)
 626 {
 627         const char *oldval;
 628         char *val;
 629         int size;
 630
 631         switch (sym->type) {
 632         case S_BOOLEAN:
 633         case S_TRISTATE:
 634                 switch (newval[0]) {
 635                 case 'y': case 'Y':
 636                         return sym_set_tristate_value(sym, yes);
 637                 case 'm': case 'M':
 638                         return sym_set_tristate_value(sym, mod);
 639                 case 'n': case 'N':
 640                         return sym_set_tristate_value(sym, no);
 641                 }
 642                 return false;
 643         default:
 644                 ;
 645         }
 646
 647         if (!sym_string_within_range(sym, newval))
 648                 return false;
 649
 650         if (!(sym->flags & SYMBOL_DEF_USER)) {
 651                 sym->flags |= SYMBOL_DEF_USER;
 652                 sym_set_changed(sym);
 653         }
 654
 655         oldval = sym->def[S_DEF_USER].val;
 656         size = strlen(newval) + 1;
 657         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 658                 size += 2;
 659                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 660                 *val++ = '0';
 661                 *val++ = 'x';
 662         } else if (!oldval || strcmp(oldval, newval))
 663                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 664         else
 665                 return true;
 666
 667         strcpy(val, newval);
 668         free((void *)oldval);
 669         sym_clear_all_valid();
 670
 671         return true;
 672 }
 673
 674 /*
 675  * Find the default value associated to a symbol.
 676  * For tristate symbol handle the modules=n case
 677  * in which case "m" becomes "y".
 678  * If the symbol does not have any default then fallback
 679  * to the fixed default values.
 680  */
 681 const char *sym_get_string_default(struct symbol *sym)
 682 {
 683         struct property *prop;
 684         struct symbol *ds;
 685         const char *str;
 686         tristate val;
 687
 688         sym_calc_visibility(sym);
 689         sym_calc_value(modules_sym);
 690         val = symbol_no.curr.tri;
 691         str = symbol_empty.curr.val;
 692
 693         /* If symbol has a default value look it up */
 694         prop = sym_get_default_prop(sym);
 695         if (prop != NULL) {
 696                 switch (sym->type) {
 697                 case S_BOOLEAN:
 698                 case S_TRISTATE:
 699                         /* The visibility may limit the value from yes => mod */
 700                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 701                         break;
 702                 default:
 703                         /*
 704                          * The following fails to handle the situation
 705                          * where a default value is further limited by
 706                          * the valid range.
 707                          */
 708                         ds = prop_get_symbol(prop);
 709                         if (ds != NULL) {
 710                                 sym_calc_value(ds);
 711                                 str = (const char *)ds->curr.val;
 712                         }
 713                 }
 714         }
 715
 716         /* Handle select statements */
 717         val = EXPR_OR(val, sym->rev_dep.tri);
 718
 719         /* transpose mod to yes if modules are not enabled */
 720         if (val == mod)
 721                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 722                         val = yes;
 723
 724         /* transpose mod to yes if type is bool */
 725         if (sym->type == S_BOOLEAN && val == mod)
 726                 val = yes;
 727
 728         switch (sym->type) {
 729         case S_BOOLEAN:
 730         case S_TRISTATE:
 731                 switch (val) {
 732                 case no: return "n";
 733                 case mod: return "m";
 734                 case yes: return "y";
 735                 }
 736         case S_INT:
 737         case S_HEX:
 738                 return str;
 739         case S_STRING:
 740                 return str;
 741         case S_OTHER:
 742         case S_UNKNOWN:
 743                 break;
 744         }
 745         return "";
 746 }
 747
 748 const char *sym_get_string_value(struct symbol *sym)
 749 {
 750         tristate val;
 751
 752         switch (sym->type) {
 753         case S_BOOLEAN:
 754         case S_TRISTATE:
 755                 val = sym_get_tristate_value(sym);
 756                 switch (val) {
 757                 case no:
 758                         return "n";
 759                 case mod:
 760                         sym_calc_value(modules_sym);
 761                         return (modules_sym->curr.tri == no) ? "n" : "m";
 762                 case yes:
 763                         return "y";
 764                 }
 765                 break;
 766         default:
 767                 ;
 768         }
 769         return (const char *)sym->curr.val;
 770 }
 771
 772 bool sym_is_changable(struct symbol *sym)
 773 {
 774         return sym->visible > sym->rev_dep.tri;
 775 }
 776
 777 static unsigned strhash(const char *s)
 778 {
 779         /* fnv32 hash */
 780         unsigned hash = 2166136261U;
 781         for (; *s; s++)
 782                 hash = (hash ^ *s) * 0x01000193;
 783         return hash;
 784 }
 785
 786 struct symbol *sym_lookup(const char *name, int flags)
 787 {
 788         struct symbol *symbol;
 789         char *new_name;
 790         int hash;
 791
 792         if (name) {
 793                 if (name[0] && !name[1]) {
 794                         switch (name[0]) {
 795                         case 'y': return &symbol_yes;
 796                         case 'm': return &symbol_mod;
 797                         case 'n': return &symbol_no;
 798                         }
 799                 }
 800                 hash = strhash(name) % SYMBOL_HASHSIZE;
 801
 802                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 803                         if (symbol->name &&
 804                             !strcmp(symbol->name, name) &&
 805                             (flags ? symbol->flags & flags
 806                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 807                                 return symbol;
 808                 }
 809                 new_name = strdup(name);
 810         } else {
 811                 new_name = NULL;
 812                 hash = 0;
 813         }
 814
 815         symbol = xmalloc(sizeof(*symbol));
 816         memset(symbol, 0, sizeof(*symbol));
 817         symbol->name = new_name;
 818         symbol->type = S_UNKNOWN;
 819         symbol->flags |= flags;
 820
 821         symbol->next = symbol_hash[hash];
 822         symbol_hash[hash] = symbol;
 823
 824         return symbol;
 825 }
 826
 827 struct symbol *sym_find(const char *name)
 828 {
 829         struct symbol *symbol = NULL;
 830         int hash = 0;
 831
 832         if (!name)
 833                 return NULL;
 834
 835         if (name[0] && !name[1]) {
 836                 switch (name[0]) {
 837                 case 'y': return &symbol_yes;
 838                 case 'm': return &symbol_mod;
 839                 case 'n': return &symbol_no;
 840                 }
 841         }
 842         hash = strhash(name) % SYMBOL_HASHSIZE;
 843
 844         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 845                 if (symbol->name &&
 846                     !strcmp(symbol->name, name) &&
 847                     !(symbol->flags & SYMBOL_CONST))
 848                                 break;
 849         }
 850
 851         return symbol;
 852 }
 853
 854 /*
 855  * Expand symbol's names embedded in the string given in argument. Symbols'
 856  * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
 857  * the empty string.
 858  */
 859 const char *sym_expand_string_value(const char *in)
 860 {
 861         const char *src;
 862         char *res;
 863         size_t reslen;
 864
 865         reslen = strlen(in) + 1;
 866         res = xmalloc(reslen);
 867         res[0] = '\0';
 868
 869         while ((src = strchr(in, '$'))) {
 870                 char *p, name[SYMBOL_MAXLENGTH];
 871                 const char *symval = "";
 872                 struct symbol *sym;
 873                 size_t newlen;
 874
 875                 strncat(res, in, src - in);
 876                 src++;
 877
 878                 p = name;
 879                 while (isalnum(*src) || *src == '_')
 880                         *p++ = *src++;
 881                 *p = '\0';
 882
 883                 sym = sym_find(name);
 884                 if (sym != NULL) {
 885                         sym_calc_value(sym);
 886                         symval = sym_get_string_value(sym);
 887                 }
 888
 889                 newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
 890                 if (newlen > reslen) {
 891                         reslen = newlen;
 892                         res = realloc(res, reslen);
 893                 }
 894
 895                 strcat(res, symval);
 896                 in = src;
 897         }
 898         strcat(res, in);
 899
 900         return res;
 901 }
 902
 903 const char *sym_escape_string_value(const char *in)
 904 {
 905         const char *p;
 906         size_t reslen;
 907         char *res;
 908         size_t l;
 909
 910         reslen = strlen(in) + strlen("\"\"") + 1;
 911
 912         p = in;
 913         for (;;) {
 914                 l = strcspn(p, "\"\\");
 915                 p += l;
 916
 917                 if (p[0] == '\0')
 918                         break;
 919
 920                 reslen++;
 921                 p++;
 922         }
 923
 924         res = xmalloc(reslen);
 925         res[0] = '\0';
 926
 927         strcat(res, "\"");
 928
 929         p = in;
 930         for (;;) {
 931                 l = strcspn(p, "\"\\");
 932                 strncat(res, p, l);
 933                 p += l;
 934
 935                 if (p[0] == '\0')
 936                         break;
 937
 938                 strcat(res, "\\");
 939                 strncat(res, p++, 1);
 940         }
 941
 942         strcat(res, "\"");
 943         return res;
 944 }
 945
 946 struct symbol **sym_re_search(const char *pattern)
 947 {
 948         struct symbol *sym, **sym_arr = NULL;
 949         int i, cnt, size;
 950         regex_t re;
 951
 952         cnt = size = 0;
 953         /* Skip if empty */
 954         if (strlen(pattern) == 0)
 955                 return NULL;
 956         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 957                 return NULL;
 958
 959         for_all_symbols(i, sym) {
 960                 if (sym->flags & SYMBOL_CONST || !sym->name)
 961                         continue;
 962                 if (regexec(&re, sym->name, 0, NULL, 0))
 963                         continue;
 964                 if (cnt + 1 >= size) {
 965                         void *tmp = sym_arr;
 966                         size += 16;
 967                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 968                         if (!sym_arr) {
 969                                 free(tmp);
 970                                 return NULL;
 971                         }
 972                 }
 973                 sym_calc_value(sym);
 974                 sym_arr[cnt++] = sym;
 975         }
 976         if (sym_arr)
 977                 sym_arr[cnt] = NULL;
 978         regfree(&re);
 979
 980         return sym_arr;
 981 }
 982
 983 /*
 984  * When we check for recursive dependencies we use a stack to save
 985  * current state so we can print out relevant info to user.
 986  * The entries are located on the call stack so no need to free memory.
 987  * Note inser() remove() must always match to properly clear the stack.
 988  */
 989 static struct dep_stack {
 990         struct dep_stack *prev, *next;
 991         struct symbol *sym;
 992         struct property *prop;
 993         struct expr *expr;
 994 } *check_top;
 995
 996 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
 997 {
 998         memset(stack, 0, sizeof(*stack));
 999         if (check_top)
1000                 check_top->next = stack;
1001         stack->prev = check_top;
1002         stack->sym = sym;
1003         check_top = stack;
1004 }
1005
1006 static void dep_stack_remove(void)
1007 {
1008         check_top = check_top->prev;
1009         if (check_top)
1010                 check_top->next = NULL;
1011 }
1012
1013 /*
1014  * Called when we have detected a recursive dependency.
1015  * check_top point to the top of the stact so we use
1016  * the ->prev pointer to locate the bottom of the stack.
1017  */
1018 static void sym_check_print_recursive(struct symbol *last_sym)
1019 {
1020         struct dep_stack *stack;
1021         struct symbol *sym, *next_sym;
1022         struct menu *menu = NULL;
1023         struct property *prop;
1024         struct dep_stack cv_stack;
1025
1026         if (sym_is_choice_value(last_sym)) {
1027                 dep_stack_insert(&cv_stack, last_sym);
1028                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1029         }
1030
1031         for (stack = check_top; stack != NULL; stack = stack->prev)
1032                 if (stack->sym == last_sym)
1033                         break;
1034         if (!stack) {
1035                 fprintf(stderr, "unexpected recursive dependency error\n");
1036                 return;
1037         }
1038
1039         for (; stack; stack = stack->next) {
1040                 sym = stack->sym;
1041                 next_sym = stack->next ? stack->next->sym : last_sym;
1042                 prop = stack->prop;
1043                 if (prop == NULL)
1044                         prop = stack->sym->prop;
1045
1046                 /* for choice values find the menu entry (used below) */
1047                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1048                         for (prop = sym->prop; prop; prop = prop->next) {
1049                                 menu = prop->menu;
1050                                 if (prop->menu)
1051                                         break;
1052                         }
1053                 }
1054                 if (stack->sym == last_sym)
1055                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1056                                 prop->file->name, prop->lineno);
1057                 if (stack->expr) {
1058                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1059                                 prop->file->name, prop->lineno,
1060                                 sym->name ? sym->name : "<choice>",
1061                                 prop_get_type_name(prop->type),
1062                                 next_sym->name ? next_sym->name : "<choice>");
1063                 } else if (stack->prop) {
1064                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1065                                 prop->file->name, prop->lineno,
1066                                 sym->name ? sym->name : "<choice>",
1067                                 next_sym->name ? next_sym->name : "<choice>");
1068                 } else if (sym_is_choice(sym)) {
1069                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1070                                 menu->file->name, menu->lineno,
1071                                 sym->name ? sym->name : "<choice>",
1072                                 next_sym->name ? next_sym->name : "<choice>");
1073                 } else if (sym_is_choice_value(sym)) {
1074                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1075                                 menu->file->name, menu->lineno,
1076                                 sym->name ? sym->name : "<choice>",
1077                                 next_sym->name ? next_sym->name : "<choice>");
1078                 } else {
1079                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1080                                 prop->file->name, prop->lineno,
1081                                 sym->name ? sym->name : "<choice>",
1082                                 next_sym->name ? next_sym->name : "<choice>");
1083                 }
1084         }
1085
1086         if (check_top == &cv_stack)
1087                 dep_stack_remove();
1088 }
1089
1090 static struct symbol *sym_check_expr_deps(struct expr *e)
1091 {
1092         struct symbol *sym;
1093
1094         if (!e)
1095                 return NULL;
1096         switch (e->type) {
1097         case E_OR:
1098         case E_AND:
1099                 sym = sym_check_expr_deps(e->left.expr);
1100                 if (sym)
1101                         return sym;
1102                 return sym_check_expr_deps(e->right.expr);
1103         case E_NOT:
1104                 return sym_check_expr_deps(e->left.expr);
1105         case E_EQUAL:
1106         case E_UNEQUAL:
1107                 sym = sym_check_deps(e->left.sym);
1108                 if (sym)
1109                         return sym;
1110                 return sym_check_deps(e->right.sym);
1111         case E_SYMBOL:
1112                 return sym_check_deps(e->left.sym);
1113         default:
1114                 break;
1115         }
1116         printf("Oops! How to check %d?\n", e->type);
1117         return NULL;
1118 }
1119
1120 /* return NULL when dependencies are OK */
1121 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1122 {
1123         struct symbol *sym2;
1124         struct property *prop;
1125         struct dep_stack stack;
1126
1127         dep_stack_insert(&stack, sym);
1128
1129         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1130         if (sym2)
1131                 goto out;
1132
1133         for (prop = sym->prop; prop; prop = prop->next) {
1134                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1135                         continue;
1136                 stack.prop = prop;
1137                 sym2 = sym_check_expr_deps(prop->visible.expr);
1138                 if (sym2)
1139                         break;
1140                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1141                         continue;
1142                 stack.expr = prop->expr;
1143                 sym2 = sym_check_expr_deps(prop->expr);
1144                 if (sym2)
1145                         break;
1146                 stack.expr = NULL;
1147         }
1148
1149 out:
1150         dep_stack_remove();
1151
1152         return sym2;
1153 }
1154
1155 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1156 {
1157         struct symbol *sym, *sym2;
1158         struct property *prop;
1159         struct expr *e;
1160         struct dep_stack stack;
1161
1162         dep_stack_insert(&stack, choice);
1163
1164         prop = sym_get_choice_prop(choice);
1165         expr_list_for_each_sym(prop->expr, e, sym)
1166                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1167
1168         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1169         sym2 = sym_check_sym_deps(choice);
1170         choice->flags &= ~SYMBOL_CHECK;
1171         if (sym2)
1172                 goto out;
1173
1174         expr_list_for_each_sym(prop->expr, e, sym) {
1175                 sym2 = sym_check_sym_deps(sym);
1176                 if (sym2)
1177                         break;
1178         }
1179 out:
1180         expr_list_for_each_sym(prop->expr, e, sym)
1181                 sym->flags &= ~SYMBOL_CHECK;
1182
1183         if (sym2 && sym_is_choice_value(sym2) &&
1184             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1185                 sym2 = choice;
1186
1187         dep_stack_remove();
1188
1189         return sym2;
1190 }
1191
1192 struct symbol *sym_check_deps(struct symbol *sym)
1193 {
1194         struct symbol *sym2;
1195         struct property *prop;
1196
1197         if (sym->flags & SYMBOL_CHECK) {
1198                 sym_check_print_recursive(sym);
1199                 return sym;
1200         }
1201         if (sym->flags & SYMBOL_CHECKED)
1202                 return NULL;
1203
1204         if (sym_is_choice_value(sym)) {
1205                 struct dep_stack stack;
1206
1207                 /* for choice groups start the check with main choice symbol */
1208                 dep_stack_insert(&stack, sym);
1209                 prop = sym_get_choice_prop(sym);
1210                 sym2 = sym_check_deps(prop_get_symbol(prop));
1211                 dep_stack_remove();
1212         } else if (sym_is_choice(sym)) {
1213                 sym2 = sym_check_choice_deps(sym);
1214         } else {
1215                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1216                 sym2 = sym_check_sym_deps(sym);
1217                 sym->flags &= ~SYMBOL_CHECK;
1218         }
1219
1220         if (sym2 && sym2 == sym)
1221                 sym2 = NULL;
1222
1223         return sym2;
1224 }
1225
1226 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1227 {
1228         struct property *prop;
1229         struct property **propp;
1230
1231         prop = xmalloc(sizeof(*prop));
1232         memset(prop, 0, sizeof(*prop));
1233         prop->type = type;
1234         prop->sym = sym;
1235         prop->file = current_file;
1236         prop->lineno = zconf_lineno();
1237
1238         /* append property to the prop list of symbol */
1239         if (sym) {
1240                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1241                         ;
1242                 *propp = prop;
1243         }
1244
1245         return prop;
1246 }
1247
1248 struct symbol *prop_get_symbol(struct property *prop)
1249 {
1250         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1251                            prop->expr->type == E_LIST))
1252                 return prop->expr->left.sym;
1253         return NULL;
1254 }
1255
1256 const char *prop_get_type_name(enum prop_type type)
1257 {
1258         switch (type) {
1259         case P_PROMPT:
1260                 return "prompt";
1261         case P_ENV:
1262                 return "env";
1263         case P_COMMENT:
1264                 return "comment";
1265         case P_MENU:
1266                 return "menu";
1267         case P_DEFAULT:
1268                 return "default";
1269         case P_CHOICE:
1270                 return "choice";
1271         case P_SELECT:
1272                 return "select";
1273         case P_RANGE:
1274                 return "range";
1275         case P_SYMBOL:
1276                 return "symbol";
1277         case P_UNKNOWN:
1278                 break;
1279         }
1280         return "unknown";
1281 }
1282
1283 static void prop_add_env(const char *env)
1284 {
1285         struct symbol *sym, *sym2;
1286         struct property *prop;
1287         char *p;
1288
1289         sym = current_entry->sym;
1290         sym->flags |= SYMBOL_AUTO;
1291         for_all_properties(sym, prop, P_ENV) {
1292                 sym2 = prop_get_symbol(prop);
1293                 if (strcmp(sym2->name, env))
1294                         menu_warn(current_entry, "redefining environment symbol from %s",
1295                                   sym2->name);
1296                 return;
1297         }
1298
1299         prop = prop_alloc(P_ENV, sym);
1300         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1301
1302         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1303         sym_env_list->right.sym = sym;
1304
1305         p = getenv(env);
1306         if (p)
1307                 sym_add_default(sym, p);
1308         else
1309                 menu_warn(current_entry, "environment variable %s undefined", env);
1310 }