scripts/config/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 static 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 long long 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 strtoll(sym->curr.val, NULL, base);
 153 }
 154
 155 static void sym_validate_range(struct symbol *sym)
 156 {
 157         struct property *prop;
 158         int base;
 159         long long 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 = strtoll(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, "%lld", val2);
 184         else
 185                 sprintf(str, "0x%llx", val2);
 186         sym->curr.val = strdup(str);
 187 }
 188
 189 static void sym_set_changed(struct symbol *sym)
 190 {
 191         struct property *prop;
 192
 193         sym->flags |= SYMBOL_CHANGED;
 194         for (prop = sym->prop; prop; prop = prop->next) {
 195                 if (prop->menu)
 196                         prop->menu->flags |= MENU_CHANGED;
 197         }
 198 }
 199
 200 static void sym_set_all_changed(void)
 201 {
 202         struct symbol *sym;
 203         int i;
 204
 205         for_all_symbols(i, sym)
 206                 sym_set_changed(sym);
 207 }
 208
 209 static void sym_calc_visibility(struct symbol *sym)
 210 {
 211         struct property *prop;
 212         struct symbol *choice_sym = NULL;
 213         tristate tri;
 214
 215         /* any prompt visible? */
 216         tri = no;
 217
 218         if (sym_is_choice_value(sym))
 219                 choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
 220
 221         for_all_prompts(sym, prop) {
 222                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 223                 /*
 224                  * Tristate choice_values with visibility 'mod' are
 225                  * not visible if the corresponding choice's value is
 226                  * 'yes'.
 227                  */
 228                 if (choice_sym && sym->type == S_TRISTATE &&
 229                     prop->visible.tri == mod && choice_sym->curr.tri == yes)
 230                         prop->visible.tri = no;
 231
 232                 tri = EXPR_OR(tri, prop->visible.tri);
 233         }
 234         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 235                 tri = yes;
 236         if (sym->visible != tri) {
 237                 sym->visible = tri;
 238                 sym_set_changed(sym);
 239         }
 240         if (sym_is_choice_value(sym))
 241                 return;
 242         /* defaulting to "yes" if no explicit "depends on" are given */
 243         tri = yes;
 244         if (sym->dir_dep.expr)
 245                 tri = expr_calc_value(sym->dir_dep.expr);
 246         if (tri == mod)
 247                 tri = yes;
 248         if (sym->dir_dep.tri != tri) {
 249                 sym->dir_dep.tri = tri;
 250                 sym_set_changed(sym);
 251         }
 252         tri = no;
 253         if (sym->rev_dep.expr)
 254                 tri = expr_calc_value(sym->rev_dep.expr);
 255         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 256                 tri = yes;
 257         if (sym->rev_dep.tri != tri) {
 258                 sym->rev_dep.tri = tri;
 259                 sym_set_changed(sym);
 260         }
 261 }
 262
 263 /*
 264  * Find the default symbol for a choice.
 265  * First try the default values for the choice symbol
 266  * Next locate the first visible choice value
 267  * Return NULL if none was found
 268  */
 269 struct symbol *sym_choice_default(struct symbol *sym)
 270 {
 271         struct symbol *def_sym;
 272         struct property *prop;
 273         struct expr *e;
 274
 275         /* any of the defaults visible? */
 276         for_all_defaults(sym, prop) {
 277                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 278                 if (prop->visible.tri == no)
 279                         continue;
 280                 def_sym = prop_get_symbol(prop);
 281                 if (def_sym->visible != no)
 282                         return def_sym;
 283         }
 284
 285         /* just get the first visible value */
 286         prop = sym_get_choice_prop(sym);
 287         expr_list_for_each_sym(prop->expr, e, def_sym)
 288                 if (def_sym->visible != no)
 289                         return def_sym;
 290
 291         /* failed to locate any defaults */
 292         return NULL;
 293 }
 294
 295 static struct symbol *sym_calc_choice(struct symbol *sym)
 296 {
 297         struct symbol *def_sym;
 298         struct property *prop;
 299         struct expr *e;
 300         int flags;
 301
 302         /* first calculate all choice values' visibilities */
 303         flags = sym->flags;
 304         prop = sym_get_choice_prop(sym);
 305         expr_list_for_each_sym(prop->expr, e, def_sym) {
 306                 sym_calc_visibility(def_sym);
 307                 if (def_sym->visible != no)
 308                         flags &= def_sym->flags;
 309         }
 310
 311         sym->flags &= flags | ~SYMBOL_DEF_USER;
 312
 313         /* is the user choice visible? */
 314         def_sym = sym->def[S_DEF_USER].val;
 315         if (def_sym && def_sym->visible != no)
 316                 return def_sym;
 317
 318         def_sym = sym_choice_default(sym);
 319
 320         if (def_sym == NULL)
 321                 /* no choice? reset tristate value */
 322                 sym->curr.tri = no;
 323
 324         return def_sym;
 325 }
 326
 327 void sym_calc_value(struct symbol *sym)
 328 {
 329         struct symbol_value newval, oldval;
 330         struct property *prop;
 331         struct expr *e;
 332
 333         if (!sym)
 334                 return;
 335
 336         if (sym->flags & SYMBOL_VALID)
 337                 return;
 338
 339         if (sym_is_choice_value(sym) &&
 340             sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
 341                 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
 342                 prop = sym_get_choice_prop(sym);
 343                 sym_calc_value(prop_get_symbol(prop));
 344         }
 345
 346         sym->flags |= SYMBOL_VALID;
 347
 348         oldval = sym->curr;
 349
 350         switch (sym->type) {
 351         case S_INT:
 352         case S_HEX:
 353         case S_STRING:
 354                 newval = symbol_empty.curr;
 355                 break;
 356         case S_BOOLEAN:
 357         case S_TRISTATE:
 358                 newval = symbol_no.curr;
 359                 break;
 360         default:
 361                 sym->curr.val = sym->name;
 362                 sym->curr.tri = no;
 363                 return;
 364         }
 365         if (!sym_is_choice_value(sym))
 366                 sym->flags &= ~SYMBOL_WRITE;
 367
 368         sym_calc_visibility(sym);
 369
 370         /* set default if recursively called */
 371         sym->curr = newval;
 372
 373         switch (sym_get_type(sym)) {
 374         case S_BOOLEAN:
 375         case S_TRISTATE:
 376                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 377                         prop = sym_get_choice_prop(sym);
 378                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 379                 } else {
 380                         if (sym->visible != no) {
 381                                 /* if the symbol is visible use the user value
 382                                  * if available, otherwise try the default value
 383                                  */
 384                                 sym->flags |= SYMBOL_WRITE;
 385                                 if (sym_has_value(sym)) {
 386                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 387                                                               sym->visible);
 388                                         goto calc_newval;
 389                                 }
 390                         }
 391                         if (sym->rev_dep.tri != no)
 392                                 sym->flags |= SYMBOL_WRITE;
 393                         if (!sym_is_choice(sym)) {
 394                                 prop = sym_get_default_prop(sym);
 395                                 if (prop) {
 396                                         sym->flags |= SYMBOL_WRITE;
 397                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 398                                                               prop->visible.tri);
 399                                 }
 400                         }
 401                 calc_newval:
 402                         if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
 403                                 newval.tri = no;
 404                         } else {
 405                                 newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 406                         }
 407                 }
 408                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 409                         newval.tri = yes;
 410                 break;
 411         case S_STRING:
 412         case S_HEX:
 413         case S_INT:
 414                 if (sym->visible != no) {
 415                         sym->flags |= SYMBOL_WRITE;
 416                         if (sym_has_value(sym)) {
 417                                 newval.val = sym->def[S_DEF_USER].val;
 418                                 break;
 419                         }
 420                 }
 421                 prop = sym_get_default_prop(sym);
 422                 if (prop) {
 423                         struct symbol *ds = prop_get_symbol(prop);
 424                         if (ds) {
 425                                 sym->flags |= SYMBOL_WRITE;
 426                                 sym_calc_value(ds);
 427                                 newval.val = ds->curr.val;
 428                         }
 429                 }
 430                 break;
 431         default:
 432                 ;
 433         }
 434
 435         sym->curr = newval;
 436         if (sym_is_choice(sym) && newval.tri == yes)
 437                 sym->curr.val = sym_calc_choice(sym);
 438         sym_validate_range(sym);
 439
 440         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 441                 sym_set_changed(sym);
 442                 if (modules_sym == sym) {
 443                         sym_set_all_changed();
 444                         modules_val = modules_sym->curr.tri;
 445                 }
 446         }
 447
 448         if (sym_is_choice(sym)) {
 449                 struct symbol *choice_sym;
 450
 451                 prop = sym_get_choice_prop(sym);
 452                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 453                         if ((sym->flags & SYMBOL_WRITE) &&
 454                             choice_sym->visible != no)
 455                                 choice_sym->flags |= SYMBOL_WRITE;
 456                         if (sym->flags & SYMBOL_CHANGED)
 457                                 sym_set_changed(choice_sym);
 458                 }
 459         }
 460
 461         if (sym->flags & SYMBOL_AUTO)
 462                 sym->flags &= ~SYMBOL_WRITE;
 463
 464         if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
 465                 set_all_choice_values(sym);
 466 }
 467
 468 void sym_clear_all_valid(void)
 469 {
 470         struct symbol *sym;
 471         int i;
 472
 473         for_all_symbols(i, sym)
 474                 sym->flags &= ~SYMBOL_VALID;
 475         sym_add_change_count(1);
 476         sym_calc_value(modules_sym);
 477 }
 478
 479 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 480 {
 481         int type = sym_get_type(sym);
 482
 483         if (sym->visible == no)
 484                 return false;
 485
 486         if (type != S_BOOLEAN && type != S_TRISTATE)
 487                 return false;
 488
 489         if (type == S_BOOLEAN && val == mod)
 490                 return false;
 491         if (sym->visible <= sym->rev_dep.tri)
 492                 return false;
 493         if (sym_is_choice_value(sym) && sym->visible == yes)
 494                 return val == yes;
 495         return val >= sym->rev_dep.tri && val <= sym->visible;
 496 }
 497
 498 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 499 {
 500         tristate oldval = sym_get_tristate_value(sym);
 501
 502         if (oldval != val && !sym_tristate_within_range(sym, val))
 503                 return false;
 504
 505         if (!(sym->flags & SYMBOL_DEF_USER)) {
 506                 sym->flags |= SYMBOL_DEF_USER;
 507                 sym_set_changed(sym);
 508         }
 509         /*
 510          * setting a choice value also resets the new flag of the choice
 511          * symbol and all other choice values.
 512          */
 513         if (sym_is_choice_value(sym) && val == yes) {
 514                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 515                 struct property *prop;
 516                 struct expr *e;
 517
 518                 cs->def[S_DEF_USER].val = sym;
 519                 cs->flags |= SYMBOL_DEF_USER;
 520                 prop = sym_get_choice_prop(cs);
 521                 for (e = prop->expr; e; e = e->left.expr) {
 522                         if (e->right.sym->visible != no)
 523                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 524                 }
 525         }
 526
 527         sym->def[S_DEF_USER].tri = val;
 528         if (oldval != val)
 529                 sym_clear_all_valid();
 530
 531         return true;
 532 }
 533
 534 tristate sym_toggle_tristate_value(struct symbol *sym)
 535 {
 536         tristate oldval, newval;
 537
 538         oldval = newval = sym_get_tristate_value(sym);
 539         do {
 540                 switch (newval) {
 541                 case no:
 542                         newval = mod;
 543                         break;
 544                 case mod:
 545                         newval = yes;
 546                         break;
 547                 case yes:
 548                         newval = no;
 549                         break;
 550                 }
 551                 if (sym_set_tristate_value(sym, newval))
 552                         break;
 553         } while (oldval != newval);
 554         return newval;
 555 }
 556
 557 bool sym_string_valid(struct symbol *sym, const char *str)
 558 {
 559         signed char ch;
 560
 561         switch (sym->type) {
 562         case S_STRING:
 563                 return true;
 564         case S_INT:
 565                 ch = *str++;
 566                 if (ch == '-')
 567                         ch = *str++;
 568                 if (!isdigit(ch))
 569                         return false;
 570                 if (ch == '0' && *str != 0)
 571                         return false;
 572                 while ((ch = *str++)) {
 573                         if (!isdigit(ch))
 574                                 return false;
 575                 }
 576                 return true;
 577         case S_HEX:
 578                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 579                         str += 2;
 580                 ch = *str++;
 581                 do {
 582                         if (!isxdigit(ch))
 583                                 return false;
 584                 } while ((ch = *str++));
 585                 return true;
 586         case S_BOOLEAN:
 587         case S_TRISTATE:
 588                 switch (str[0]) {
 589                 case 'y': case 'Y':
 590                 case 'm': case 'M':
 591                 case 'n': case 'N':
 592                         return true;
 593                 }
 594                 return false;
 595         default:
 596                 return false;
 597         }
 598 }
 599
 600 bool sym_string_within_range(struct symbol *sym, const char *str)
 601 {
 602         struct property *prop;
 603         long long val;
 604
 605         switch (sym->type) {
 606         case S_STRING:
 607                 return sym_string_valid(sym, str);
 608         case S_INT:
 609                 if (!sym_string_valid(sym, str))
 610                         return false;
 611                 prop = sym_get_range_prop(sym);
 612                 if (!prop)
 613                         return true;
 614                 val = strtoll(str, NULL, 10);
 615                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 616                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 617         case S_HEX:
 618                 if (!sym_string_valid(sym, str))
 619                         return false;
 620                 prop = sym_get_range_prop(sym);
 621                 if (!prop)
 622                         return true;
 623                 val = strtoll(str, NULL, 16);
 624                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 625                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 626         case S_BOOLEAN:
 627         case S_TRISTATE:
 628                 switch (str[0]) {
 629                 case 'y': case 'Y':
 630                         return sym_tristate_within_range(sym, yes);
 631                 case 'm': case 'M':
 632                         return sym_tristate_within_range(sym, mod);
 633                 case 'n': case 'N':
 634                         return sym_tristate_within_range(sym, no);
 635                 }
 636                 return false;
 637         default:
 638                 return false;
 639         }
 640 }
 641
 642 bool sym_set_string_value(struct symbol *sym, const char *newval)
 643 {
 644         const char *oldval;
 645         char *val;
 646         int size;
 647
 648         switch (sym->type) {
 649         case S_BOOLEAN:
 650         case S_TRISTATE:
 651                 switch (newval[0]) {
 652                 case 'y': case 'Y':
 653                         return sym_set_tristate_value(sym, yes);
 654                 case 'm': case 'M':
 655                         return sym_set_tristate_value(sym, mod);
 656                 case 'n': case 'N':
 657                         return sym_set_tristate_value(sym, no);
 658                 }
 659                 return false;
 660         default:
 661                 ;
 662         }
 663
 664         if (!sym_string_within_range(sym, newval))
 665                 return false;
 666
 667         if (!(sym->flags & SYMBOL_DEF_USER)) {
 668                 sym->flags |= SYMBOL_DEF_USER;
 669                 sym_set_changed(sym);
 670         }
 671
 672         oldval = sym->def[S_DEF_USER].val;
 673         size = strlen(newval) + 1;
 674         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 675                 size += 2;
 676                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 677                 *val++ = '0';
 678                 *val++ = 'x';
 679         } else if (!oldval || strcmp(oldval, newval))
 680                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 681         else
 682                 return true;
 683
 684         strcpy(val, newval);
 685         free((void *)oldval);
 686         sym_clear_all_valid();
 687
 688         return true;
 689 }
 690
 691 /*
 692  * Find the default value associated to a symbol.
 693  * For tristate symbol handle the modules=n case
 694  * in which case "m" becomes "y".
 695  * If the symbol does not have any default then fallback
 696  * to the fixed default values.
 697  */
 698 const char *sym_get_string_default(struct symbol *sym)
 699 {
 700         struct property *prop;
 701         struct symbol *ds;
 702         const char *str;
 703         tristate val;
 704
 705         sym_calc_visibility(sym);
 706         sym_calc_value(modules_sym);
 707         val = symbol_no.curr.tri;
 708         str = symbol_empty.curr.val;
 709
 710         /* If symbol has a default value look it up */
 711         prop = sym_get_default_prop(sym);
 712         if (prop != NULL) {
 713                 switch (sym->type) {
 714                 case S_BOOLEAN:
 715                 case S_TRISTATE:
 716                         /* The visibility may limit the value from yes => mod */
 717                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 718                         break;
 719                 default:
 720                         /*
 721                          * The following fails to handle the situation
 722                          * where a default value is further limited by
 723                          * the valid range.
 724                          */
 725                         ds = prop_get_symbol(prop);
 726                         if (ds != NULL) {
 727                                 sym_calc_value(ds);
 728                                 str = (const char *)ds->curr.val;
 729                         }
 730                 }
 731         }
 732
 733         /* Handle select statements */
 734         val = EXPR_OR(val, sym->rev_dep.tri);
 735
 736         /* transpose mod to yes if modules are not enabled */
 737         if (val == mod)
 738                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 739                         val = yes;
 740
 741         /* transpose mod to yes if type is bool */
 742         if (sym->type == S_BOOLEAN && val == mod)
 743                 val = yes;
 744
 745         switch (sym->type) {
 746         case S_BOOLEAN:
 747         case S_TRISTATE:
 748                 switch (val) {
 749                 case no: return "n";
 750                 case mod: return "m";
 751                 case yes: return "y";
 752                 }
 753         case S_INT:
 754         case S_HEX:
 755                 return str;
 756         case S_STRING:
 757                 return str;
 758         case S_OTHER:
 759         case S_UNKNOWN:
 760                 break;
 761         }
 762         return "";
 763 }
 764
 765 const char *sym_get_string_value(struct symbol *sym)
 766 {
 767         tristate val;
 768
 769         switch (sym->type) {
 770         case S_BOOLEAN:
 771         case S_TRISTATE:
 772                 val = sym_get_tristate_value(sym);
 773                 switch (val) {
 774                 case no:
 775                         return "n";
 776                 case mod:
 777                         sym_calc_value(modules_sym);
 778                         return (modules_sym->curr.tri == no) ? "n" : "m";
 779                 case yes:
 780                         return "y";
 781                 }
 782                 break;
 783         default:
 784                 ;
 785         }
 786         return (const char *)sym->curr.val;
 787 }
 788
 789 bool sym_is_changable(struct symbol *sym)
 790 {
 791         return sym->visible > sym->rev_dep.tri;
 792 }
 793
 794 static unsigned strhash(const char *s)
 795 {
 796         /* fnv32 hash */
 797         unsigned hash = 2166136261U;
 798         for (; *s; s++)
 799                 hash = (hash ^ *s) * 0x01000193;
 800         return hash;
 801 }
 802
 803 struct symbol *sym_lookup(const char *name, int flags)
 804 {
 805         struct symbol *symbol;
 806         char *new_name;
 807         int hash;
 808
 809         if (name) {
 810                 if (name[0] && !name[1]) {
 811                         switch (name[0]) {
 812                         case 'y': return &symbol_yes;
 813                         case 'm': return &symbol_mod;
 814                         case 'n': return &symbol_no;
 815                         }
 816                 }
 817                 hash = strhash(name) % SYMBOL_HASHSIZE;
 818
 819                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 820                         if (symbol->name &&
 821                             !strcmp(symbol->name, name) &&
 822                             (flags ? symbol->flags & flags
 823                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 824                                 return symbol;
 825                 }
 826                 new_name = strdup(name);
 827         } else {
 828                 new_name = NULL;
 829                 hash = 0;
 830         }
 831
 832         symbol = xmalloc(sizeof(*symbol));
 833         memset(symbol, 0, sizeof(*symbol));
 834         symbol->name = new_name;
 835         symbol->type = S_UNKNOWN;
 836         symbol->flags |= flags;
 837
 838         symbol->next = symbol_hash[hash];
 839         symbol_hash[hash] = symbol;
 840
 841         return symbol;
 842 }
 843
 844 struct symbol *sym_find(const char *name)
 845 {
 846         struct symbol *symbol = NULL;
 847         int hash = 0;
 848
 849         if (!name)
 850                 return NULL;
 851
 852         if (name[0] && !name[1]) {
 853                 switch (name[0]) {
 854                 case 'y': return &symbol_yes;
 855                 case 'm': return &symbol_mod;
 856                 case 'n': return &symbol_no;
 857                 }
 858         }
 859         hash = strhash(name) % SYMBOL_HASHSIZE;
 860
 861         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 862                 if (symbol->name &&
 863                     !strcmp(symbol->name, name) &&
 864                     !(symbol->flags & SYMBOL_CONST))
 865                                 break;
 866         }
 867
 868         return symbol;
 869 }
 870
 871 /*
 872  * Expand symbol's names embedded in the string given in argument. Symbols'
 873  * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
 874  * the empty string.
 875  */
 876 const char *sym_expand_string_value(const char *in)
 877 {
 878         const char *src;
 879         char *res;
 880         size_t reslen;
 881
 882         reslen = strlen(in) + 1;
 883         res = xmalloc(reslen);
 884         res[0] = '\0';
 885
 886         while ((src = strchr(in, '$'))) {
 887                 char *p, name[SYMBOL_MAXLENGTH];
 888                 const char *symval = "";
 889                 struct symbol *sym;
 890                 size_t newlen;
 891
 892                 strncat(res, in, src - in);
 893                 src++;
 894
 895                 p = name;
 896                 while (isalnum(*src) || *src == '_')
 897                         *p++ = *src++;
 898                 *p = '\0';
 899
 900                 sym = sym_find(name);
 901                 if (sym != NULL) {
 902                         sym_calc_value(sym);
 903                         symval = sym_get_string_value(sym);
 904                 }
 905
 906                 newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
 907                 if (newlen > reslen) {
 908                         reslen = newlen;
 909                         res = realloc(res, reslen);
 910                 }
 911
 912                 strcat(res, symval);
 913                 in = src;
 914         }
 915         strcat(res, in);
 916
 917         return res;
 918 }
 919
 920 const char *sym_escape_string_value(const char *in)
 921 {
 922         const char *p;
 923         size_t reslen;
 924         char *res;
 925         size_t l;
 926
 927         reslen = strlen(in) + strlen("\"\"") + 1;
 928
 929         p = in;
 930         for (;;) {
 931                 l = strcspn(p, "\"\\");
 932                 p += l;
 933
 934                 if (p[0] == '\0')
 935                         break;
 936
 937                 reslen++;
 938                 p++;
 939         }
 940
 941         res = xmalloc(reslen);
 942         res[0] = '\0';
 943
 944         strcat(res, "\"");
 945
 946         p = in;
 947         for (;;) {
 948                 l = strcspn(p, "\"\\");
 949                 strncat(res, p, l);
 950                 p += l;
 951
 952                 if (p[0] == '\0')
 953                         break;
 954
 955                 strcat(res, "\\");
 956                 strncat(res, p++, 1);
 957         }
 958
 959         strcat(res, "\"");
 960         return res;
 961 }
 962
 963 struct sym_match {
 964         struct symbol   *sym;
 965         off_t           so, eo;
 966 };
 967
 968 /* Compare matched symbols as thus:
 969  * - first, symbols that match exactly
 970  * - then, alphabetical sort
 971  */
 972 static int sym_rel_comp(const void *sym1, const void *sym2)
 973 {
 974         const struct sym_match *s1 = sym1;
 975         const struct sym_match *s2 = sym2;
 976         int exact1, exact2;
 977
 978         /* Exact match:
 979          * - if matched length on symbol s1 is the length of that symbol,
 980          *   then this symbol should come first;
 981          * - if matched length on symbol s2 is the length of that symbol,
 982          *   then this symbol should come first.
 983          * Note: since the search can be a regexp, both symbols may match
 984          * exactly; if this is the case, we can't decide which comes first,
 985          * and we fallback to sorting alphabetically.
 986          */
 987         exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
 988         exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
 989         if (exact1 && !exact2)
 990                 return -1;
 991         if (!exact1 && exact2)
 992                 return 1;
 993
 994         /* As a fallback, sort symbols alphabetically */
 995         return strcmp(s1->sym->name, s2->sym->name);
 996 }
 997
 998 struct symbol **sym_re_search(const char *pattern)
 999 {
1000         struct symbol *sym, **sym_arr = NULL;
1001         struct sym_match *sym_match_arr = NULL;
1002         int i, cnt, size;
1003         regex_t re;
1004         regmatch_t match[1];
1005
1006         cnt = size = 0;
1007         /* Skip if empty */
1008         if (strlen(pattern) == 0)
1009                 return NULL;
1010         if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
1011                 return NULL;
1012
1013         for_all_symbols(i, sym) {
1014                 if (sym->flags & SYMBOL_CONST || !sym->name)
1015                         continue;
1016                 if (regexec(&re, sym->name, 1, match, 0))
1017                         continue;
1018                 if (cnt >= size) {
1019                         void *tmp;
1020                         size += 16;
1021                         tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
1022                         if (!tmp)
1023                                 goto sym_re_search_free;
1024                         sym_match_arr = tmp;
1025                 }
1026                 sym_calc_value(sym);
1027                 /* As regexec returned 0, we know we have a match, so
1028                  * we can use match[0].rm_[se]o without further checks
1029                  */
1030                 sym_match_arr[cnt].so = match[0].rm_so;
1031                 sym_match_arr[cnt].eo = match[0].rm_eo;
1032                 sym_match_arr[cnt++].sym = sym;
1033         }
1034         if (sym_match_arr) {
1035                 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
1036                 sym_arr = malloc((cnt+1) * sizeof(struct symbol));
1037                 if (!sym_arr)
1038                         goto sym_re_search_free;
1039                 for (i = 0; i < cnt; i++)
1040                         sym_arr[i] = sym_match_arr[i].sym;
1041                 sym_arr[cnt] = NULL;
1042         }
1043 sym_re_search_free:
1044         /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
1045         free(sym_match_arr);
1046         regfree(&re);
1047
1048         return sym_arr;
1049 }
1050
1051 /*
1052  * When we check for recursive dependencies we use a stack to save
1053  * current state so we can print out relevant info to user.
1054  * The entries are located on the call stack so no need to free memory.
1055  * Note insert() remove() must always match to properly clear the stack.
1056  */
1057 static struct dep_stack {
1058         struct dep_stack *prev, *next;
1059         struct symbol *sym;
1060         struct property *prop;
1061         struct expr *expr;
1062 } *check_top;
1063
1064 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1065 {
1066         memset(stack, 0, sizeof(*stack));
1067         if (check_top)
1068                 check_top->next = stack;
1069         stack->prev = check_top;
1070         stack->sym = sym;
1071         check_top = stack;
1072 }
1073
1074 static void dep_stack_remove(void)
1075 {
1076         check_top = check_top->prev;
1077         if (check_top)
1078                 check_top->next = NULL;
1079 }
1080
1081 /*
1082  * Called when we have detected a recursive dependency.
1083  * check_top point to the top of the stact so we use
1084  * the ->prev pointer to locate the bottom of the stack.
1085  */
1086 static void sym_check_print_recursive(struct symbol *last_sym)
1087 {
1088         struct dep_stack *stack;
1089         struct symbol *sym, *next_sym;
1090         struct menu *menu = NULL;
1091         struct property *prop;
1092         struct dep_stack cv_stack;
1093
1094         if (sym_is_choice_value(last_sym)) {
1095                 dep_stack_insert(&cv_stack, last_sym);
1096                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1097         }
1098
1099         for (stack = check_top; stack != NULL; stack = stack->prev)
1100                 if (stack->sym == last_sym)
1101                         break;
1102         if (!stack) {
1103                 fprintf(stderr, "unexpected recursive dependency error\n");
1104                 return;
1105         }
1106
1107         for (; stack; stack = stack->next) {
1108                 sym = stack->sym;
1109                 next_sym = stack->next ? stack->next->sym : last_sym;
1110                 prop = stack->prop;
1111                 if (prop == NULL)
1112                         prop = stack->sym->prop;
1113
1114                 /* for choice values find the menu entry (used below) */
1115                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1116                         for (prop = sym->prop; prop; prop = prop->next) {
1117                                 menu = prop->menu;
1118                                 if (prop->menu)
1119                                         break;
1120                         }
1121                 }
1122                 if (stack->sym == last_sym)
1123                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1124                                 prop->file->name, prop->lineno);
1125                         fprintf(stderr, "For a resolution refer to Documentation/kbuild/kconfig-language.txt\n");
1126                         fprintf(stderr, "subsection \"Kconfig recursive dependency limitations\"\n");
1127                 if (stack->expr) {
1128                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1129                                 prop->file->name, prop->lineno,
1130                                 sym->name ? sym->name : "<choice>",
1131                                 prop_get_type_name(prop->type),
1132                                 next_sym->name ? next_sym->name : "<choice>");
1133                 } else if (stack->prop) {
1134                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1135                                 prop->file->name, prop->lineno,
1136                                 sym->name ? sym->name : "<choice>",
1137                                 next_sym->name ? next_sym->name : "<choice>");
1138                 } else if (sym_is_choice(sym)) {
1139                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1140                                 menu->file->name, menu->lineno,
1141                                 sym->name ? sym->name : "<choice>",
1142                                 next_sym->name ? next_sym->name : "<choice>");
1143                 } else if (sym_is_choice_value(sym)) {
1144                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1145                                 menu->file->name, menu->lineno,
1146                                 sym->name ? sym->name : "<choice>",
1147                                 next_sym->name ? next_sym->name : "<choice>");
1148                 } else {
1149                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1150                                 prop->file->name, prop->lineno,
1151                                 sym->name ? sym->name : "<choice>",
1152                                 next_sym->name ? next_sym->name : "<choice>");
1153                 }
1154         }
1155
1156         if (check_top == &cv_stack)
1157                 dep_stack_remove();
1158 }
1159
1160 static struct symbol *sym_check_expr_deps(struct expr *e)
1161 {
1162         struct symbol *sym;
1163
1164         if (!e)
1165                 return NULL;
1166         switch (e->type) {
1167         case E_OR:
1168         case E_AND:
1169                 sym = sym_check_expr_deps(e->left.expr);
1170                 if (sym)
1171                         return sym;
1172                 return sym_check_expr_deps(e->right.expr);
1173         case E_NOT:
1174                 return sym_check_expr_deps(e->left.expr);
1175         case E_EQUAL:
1176         case E_GEQ:
1177         case E_GTH:
1178         case E_LEQ:
1179         case E_LTH:
1180         case E_UNEQUAL:
1181                 sym = sym_check_deps(e->left.sym);
1182                 if (sym)
1183                         return sym;
1184                 return sym_check_deps(e->right.sym);
1185         case E_SYMBOL:
1186                 return sym_check_deps(e->left.sym);
1187         default:
1188                 break;
1189         }
1190         printf("Oops! How to check %d?\n", e->type);
1191         return NULL;
1192 }
1193
1194 /* return NULL when dependencies are OK */
1195 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1196 {
1197         struct symbol *sym2;
1198         struct property *prop;
1199         struct dep_stack stack;
1200
1201         dep_stack_insert(&stack, sym);
1202
1203         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1204         if (sym2)
1205                 goto out;
1206
1207         for (prop = sym->prop; prop; prop = prop->next) {
1208                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1209                         continue;
1210                 stack.prop = prop;
1211                 sym2 = sym_check_expr_deps(prop->visible.expr);
1212                 if (sym2)
1213                         break;
1214                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1215                         continue;
1216                 stack.expr = prop->expr;
1217                 sym2 = sym_check_expr_deps(prop->expr);
1218                 if (sym2)
1219                         break;
1220                 stack.expr = NULL;
1221         }
1222
1223 out:
1224         dep_stack_remove();
1225
1226         return sym2;
1227 }
1228
1229 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1230 {
1231         struct symbol *sym, *sym2;
1232         struct property *prop;
1233         struct expr *e;
1234         struct dep_stack stack;
1235
1236         dep_stack_insert(&stack, choice);
1237
1238         prop = sym_get_choice_prop(choice);
1239         expr_list_for_each_sym(prop->expr, e, sym)
1240                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1241
1242         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1243         sym2 = sym_check_sym_deps(choice);
1244         choice->flags &= ~SYMBOL_CHECK;
1245         if (sym2)
1246                 goto out;
1247
1248         expr_list_for_each_sym(prop->expr, e, sym) {
1249                 sym2 = sym_check_sym_deps(sym);
1250                 if (sym2)
1251                         break;
1252         }
1253 out:
1254         expr_list_for_each_sym(prop->expr, e, sym)
1255                 sym->flags &= ~SYMBOL_CHECK;
1256
1257         if (sym2 && sym_is_choice_value(sym2) &&
1258             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1259                 sym2 = choice;
1260
1261         dep_stack_remove();
1262
1263         return sym2;
1264 }
1265
1266 struct symbol *sym_check_deps(struct symbol *sym)
1267 {
1268         struct symbol *sym2;
1269         struct property *prop;
1270
1271         if (sym->flags & SYMBOL_CHECK) {
1272                 sym_check_print_recursive(sym);
1273                 return sym;
1274         }
1275         if (sym->flags & SYMBOL_CHECKED)
1276                 return NULL;
1277
1278         if (sym_is_choice_value(sym)) {
1279                 struct dep_stack stack;
1280
1281                 /* for choice groups start the check with main choice symbol */
1282                 dep_stack_insert(&stack, sym);
1283                 prop = sym_get_choice_prop(sym);
1284                 sym2 = sym_check_deps(prop_get_symbol(prop));
1285                 dep_stack_remove();
1286         } else if (sym_is_choice(sym)) {
1287                 sym2 = sym_check_choice_deps(sym);
1288         } else {
1289                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1290                 sym2 = sym_check_sym_deps(sym);
1291                 sym->flags &= ~SYMBOL_CHECK;
1292         }
1293
1294         if (sym2 && sym2 == sym)
1295                 sym2 = NULL;
1296
1297         return sym2;
1298 }
1299
1300 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1301 {
1302         struct property *prop;
1303         struct property **propp;
1304
1305         prop = xmalloc(sizeof(*prop));
1306         memset(prop, 0, sizeof(*prop));
1307         prop->type = type;
1308         prop->sym = sym;
1309         prop->file = current_file;
1310         prop->lineno = zconf_lineno();
1311
1312         /* append property to the prop list of symbol */
1313         if (sym) {
1314                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1315                         ;
1316                 *propp = prop;
1317         }
1318
1319         return prop;
1320 }
1321
1322 struct symbol *prop_get_symbol(struct property *prop)
1323 {
1324         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1325                            prop->expr->type == E_LIST))
1326                 return prop->expr->left.sym;
1327         return NULL;
1328 }
1329
1330 const char *prop_get_type_name(enum prop_type type)
1331 {
1332         switch (type) {
1333         case P_PROMPT:
1334                 return "prompt";
1335         case P_ENV:
1336                 return "env";
1337         case P_COMMENT:
1338                 return "comment";
1339         case P_MENU:
1340                 return "menu";
1341         case P_DEFAULT:
1342                 return "default";
1343         case P_CHOICE:
1344                 return "choice";
1345         case P_SELECT:
1346                 return "select";
1347         case P_RANGE:
1348                 return "range";
1349         case P_SYMBOL:
1350                 return "symbol";
1351         case P_RESET:
1352                 return "reset";
1353         case P_UNKNOWN:
1354                 break;
1355         }
1356         return "unknown";
1357 }
1358
1359 static void prop_add_env(const char *env)
1360 {
1361         struct symbol *sym, *sym2;
1362         struct property *prop;
1363         char *p;
1364
1365         sym = current_entry->sym;
1366         sym->flags |= SYMBOL_AUTO;
1367         for_all_properties(sym, prop, P_ENV) {
1368                 sym2 = prop_get_symbol(prop);
1369                 if (strcmp(sym2->name, env))
1370                         menu_warn(current_entry, "redefining environment symbol from %s",
1371                                   sym2->name);
1372                 return;
1373         }
1374
1375         prop = prop_alloc(P_ENV, sym);
1376         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1377
1378         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1379         sym_env_list->right.sym = sym;
1380
1381         p = getenv(env);
1382         if (p)
1383                 sym_add_default(sym, p);
1384         else
1385                 menu_warn(current_entry, "environment variable %s undefined", env);
1386 }