scripts/kconfig/symbol.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <[email protected]>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <ctype.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <regex.h>
  10 #include <sys/utsname.h>
  11
  12 #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 enum symbol_type sym_get_type(struct symbol *sym)
  37 {
  38         enum symbol_type type = sym->type;
  39
  40         if (type == S_TRISTATE) {
  41                 if (sym_is_choice_value(sym) && sym->visible == yes)
  42                         type = S_BOOLEAN;
  43                 else if (modules_val == no)
  44                         type = S_BOOLEAN;
  45         }
  46         return type;
  47 }
  48
  49 const char *sym_type_name(enum symbol_type type)
  50 {
  51         switch (type) {
  52         case S_BOOLEAN:
  53                 return "bool";
  54         case S_TRISTATE:
  55                 return "tristate";
  56         case S_INT:
  57                 return "integer";
  58         case S_HEX:
  59                 return "hex";
  60         case S_STRING:
  61                 return "string";
  62         case S_UNKNOWN:
  63                 return "unknown";
  64         case S_OTHER:
  65                 break;
  66         }
  67         return "???";
  68 }
  69
  70 struct property *sym_get_choice_prop(struct symbol *sym)
  71 {
  72         struct property *prop;
  73
  74         for_all_choices(sym, prop)
  75                 return prop;
  76         return NULL;
  77 }
  78
  79 static struct property *sym_get_default_prop(struct symbol *sym)
  80 {
  81         struct property *prop;
  82
  83         for_all_defaults(sym, prop) {
  84                 prop->visible.tri = expr_calc_value(prop->visible.expr);
  85                 if (prop->visible.tri != no)
  86                         return prop;
  87         }
  88         return NULL;
  89 }
  90
  91 static struct property *sym_get_range_prop(struct symbol *sym)
  92 {
  93         struct property *prop;
  94
  95         for_all_properties(sym, prop, P_RANGE) {
  96                 prop->visible.tri = expr_calc_value(prop->visible.expr);
  97                 if (prop->visible.tri != no)
  98                         return prop;
  99         }
 100         return NULL;
 101 }
 102
 103 static long long sym_get_range_val(struct symbol *sym, int base)
 104 {
 105         sym_calc_value(sym);
 106         switch (sym->type) {
 107         case S_INT:
 108                 base = 10;
 109                 break;
 110         case S_HEX:
 111                 base = 16;
 112                 break;
 113         default:
 114                 break;
 115         }
 116         return strtoll(sym->curr.val, NULL, base);
 117 }
 118
 119 static void sym_validate_range(struct symbol *sym)
 120 {
 121         struct property *prop;
 122         int base;
 123         long long val, val2;
 124         char str[64];
 125
 126         switch (sym->type) {
 127         case S_INT:
 128                 base = 10;
 129                 break;
 130         case S_HEX:
 131                 base = 16;
 132                 break;
 133         default:
 134                 return;
 135         }
 136         prop = sym_get_range_prop(sym);
 137         if (!prop)
 138                 return;
 139         val = strtoll(sym->curr.val, NULL, base);
 140         val2 = sym_get_range_val(prop->expr->left.sym, base);
 141         if (val >= val2) {
 142                 val2 = sym_get_range_val(prop->expr->right.sym, base);
 143                 if (val <= val2)
 144                         return;
 145         }
 146         if (sym->type == S_INT)
 147                 sprintf(str, "%lld", val2);
 148         else
 149                 sprintf(str, "0x%llx", val2);
 150         sym->curr.val = xstrdup(str);
 151 }
 152
 153 static void sym_set_changed(struct symbol *sym)
 154 {
 155         struct property *prop;
 156
 157         sym->flags |= SYMBOL_CHANGED;
 158         for (prop = sym->prop; prop; prop = prop->next) {
 159                 if (prop->menu)
 160                         prop->menu->flags |= MENU_CHANGED;
 161         }
 162 }
 163
 164 static void sym_set_all_changed(void)
 165 {
 166         struct symbol *sym;
 167         int i;
 168
 169         for_all_symbols(i, sym)
 170                 sym_set_changed(sym);
 171 }
 172
 173 static void sym_calc_visibility(struct symbol *sym)
 174 {
 175         struct property *prop;
 176         struct symbol *choice_sym = NULL;
 177         tristate tri;
 178
 179         /* any prompt visible? */
 180         tri = no;
 181
 182         if (sym_is_choice_value(sym))
 183                 choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
 184
 185         for_all_prompts(sym, prop) {
 186                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 187                 /*
 188                  * Tristate choice_values with visibility 'mod' are
 189                  * not visible if the corresponding choice's value is
 190                  * 'yes'.
 191                  */
 192                 if (choice_sym && sym->type == S_TRISTATE &&
 193                     prop->visible.tri == mod && choice_sym->curr.tri == yes)
 194                         prop->visible.tri = no;
 195
 196                 tri = EXPR_OR(tri, prop->visible.tri);
 197         }
 198         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 199                 tri = yes;
 200         if (sym->visible != tri) {
 201                 sym->visible = tri;
 202                 sym_set_changed(sym);
 203         }
 204         if (sym_is_choice_value(sym))
 205                 return;
 206         /* defaulting to "yes" if no explicit "depends on" are given */
 207         tri = yes;
 208         if (sym->dir_dep.expr)
 209                 tri = expr_calc_value(sym->dir_dep.expr);
 210         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 211                 tri = yes;
 212         if (sym->dir_dep.tri != tri) {
 213                 sym->dir_dep.tri = tri;
 214                 sym_set_changed(sym);
 215         }
 216         tri = no;
 217         if (sym->rev_dep.expr)
 218                 tri = expr_calc_value(sym->rev_dep.expr);
 219         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 220                 tri = yes;
 221         if (sym->rev_dep.tri != tri) {
 222                 sym->rev_dep.tri = tri;
 223                 sym_set_changed(sym);
 224         }
 225         tri = no;
 226         if (sym->implied.expr && sym->dir_dep.tri != no)
 227                 tri = expr_calc_value(sym->implied.expr);
 228         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 229                 tri = yes;
 230         if (sym->implied.tri != tri) {
 231                 sym->implied.tri = tri;
 232                 sym_set_changed(sym);
 233         }
 234 }
 235
 236 /*
 237  * Find the default symbol for a choice.
 238  * First try the default values for the choice symbol
 239  * Next locate the first visible choice value
 240  * Return NULL if none was found
 241  */
 242 struct symbol *sym_choice_default(struct symbol *sym)
 243 {
 244         struct symbol *def_sym;
 245         struct property *prop;
 246         struct expr *e;
 247
 248         /* any of the defaults visible? */
 249         for_all_defaults(sym, prop) {
 250                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 251                 if (prop->visible.tri == no)
 252                         continue;
 253                 def_sym = prop_get_symbol(prop);
 254                 if (def_sym->visible != no)
 255                         return def_sym;
 256         }
 257
 258         /* just get the first visible value */
 259         prop = sym_get_choice_prop(sym);
 260         expr_list_for_each_sym(prop->expr, e, def_sym)
 261                 if (def_sym->visible != no)
 262                         return def_sym;
 263
 264         /* failed to locate any defaults */
 265         return NULL;
 266 }
 267
 268 static struct symbol *sym_calc_choice(struct symbol *sym)
 269 {
 270         struct symbol *def_sym;
 271         struct property *prop;
 272         struct expr *e;
 273         int flags;
 274
 275         /* first calculate all choice values' visibilities */
 276         flags = sym->flags;
 277         prop = sym_get_choice_prop(sym);
 278         expr_list_for_each_sym(prop->expr, e, def_sym) {
 279                 sym_calc_visibility(def_sym);
 280                 if (def_sym->visible != no)
 281                         flags &= def_sym->flags;
 282         }
 283
 284         sym->flags &= flags | ~SYMBOL_DEF_USER;
 285
 286         /* is the user choice visible? */
 287         def_sym = sym->def[S_DEF_USER].val;
 288         if (def_sym && def_sym->visible != no)
 289                 return def_sym;
 290
 291         def_sym = sym_choice_default(sym);
 292
 293         if (def_sym == NULL)
 294                 /* no choice? reset tristate value */
 295                 sym->curr.tri = no;
 296
 297         return def_sym;
 298 }
 299
 300 static void sym_warn_unmet_dep(struct symbol *sym)
 301 {
 302         struct gstr gs = str_new();
 303
 304         str_printf(&gs,
 305                    "\nWARNING: unmet direct dependencies detected for %s\n",
 306                    sym->name);
 307         str_printf(&gs,
 308                    "  Depends on [%c]: ",
 309                    sym->dir_dep.tri == mod ? 'm' : 'n');
 310         expr_gstr_print(sym->dir_dep.expr, &gs);
 311         str_printf(&gs, "\n");
 312
 313         expr_gstr_print_revdep(sym->rev_dep.expr, &gs, yes,
 314                                "  Selected by [y]:\n");
 315         expr_gstr_print_revdep(sym->rev_dep.expr, &gs, mod,
 316                                "  Selected by [m]:\n");
 317
 318         fputs(str_get(&gs), stderr);
 319 }
 320
 321 void sym_calc_value(struct symbol *sym)
 322 {
 323         struct symbol_value newval, oldval;
 324         struct property *prop;
 325         struct expr *e;
 326
 327         if (!sym)
 328                 return;
 329
 330         if (sym->flags & SYMBOL_VALID)
 331                 return;
 332
 333         if (sym_is_choice_value(sym) &&
 334             sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
 335                 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
 336                 prop = sym_get_choice_prop(sym);
 337                 sym_calc_value(prop_get_symbol(prop));
 338         }
 339
 340         sym->flags |= SYMBOL_VALID;
 341
 342         oldval = sym->curr;
 343
 344         switch (sym->type) {
 345         case S_INT:
 346         case S_HEX:
 347         case S_STRING:
 348                 newval = symbol_empty.curr;
 349                 break;
 350         case S_BOOLEAN:
 351         case S_TRISTATE:
 352                 newval = symbol_no.curr;
 353                 break;
 354         default:
 355                 sym->curr.val = sym->name;
 356                 sym->curr.tri = no;
 357                 return;
 358         }
 359         sym->flags &= ~SYMBOL_WRITE;
 360
 361         sym_calc_visibility(sym);
 362
 363         if (sym->visible != no)
 364                 sym->flags |= SYMBOL_WRITE;
 365
 366         /* set default if recursively called */
 367         sym->curr = newval;
 368
 369         switch (sym_get_type(sym)) {
 370         case S_BOOLEAN:
 371         case S_TRISTATE:
 372                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 373                         prop = sym_get_choice_prop(sym);
 374                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 375                 } else {
 376                         if (sym->visible != no) {
 377                                 /* if the symbol is visible use the user value
 378                                  * if available, otherwise try the default value
 379                                  */
 380                                 if (sym_has_value(sym)) {
 381                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 382                                                               sym->visible);
 383                                         goto calc_newval;
 384                                 }
 385                         }
 386                         if (sym->rev_dep.tri != no)
 387                                 sym->flags |= SYMBOL_WRITE;
 388                         if (!sym_is_choice(sym)) {
 389                                 prop = sym_get_default_prop(sym);
 390                                 if (prop) {
 391                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 392                                                               prop->visible.tri);
 393                                         if (newval.tri != no)
 394                                                 sym->flags |= SYMBOL_WRITE;
 395                                 }
 396                                 if (sym->implied.tri != no) {
 397                                         sym->flags |= SYMBOL_WRITE;
 398                                         newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
 399                                 }
 400                         }
 401                 calc_newval:
 402                         if (sym->dir_dep.tri < sym->rev_dep.tri)
 403                                 sym_warn_unmet_dep(sym);
 404                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 405                 }
 406                 if (newval.tri == mod &&
 407                     (sym_get_type(sym) == S_BOOLEAN || sym->implied.tri == yes))
 408                         newval.tri = yes;
 409                 break;
 410         case S_STRING:
 411         case S_HEX:
 412         case S_INT:
 413                 if (sym->visible != no && sym_has_value(sym)) {
 414                         newval.val = sym->def[S_DEF_USER].val;
 415                         break;
 416                 }
 417                 prop = sym_get_default_prop(sym);
 418                 if (prop) {
 419                         struct symbol *ds = prop_get_symbol(prop);
 420                         if (ds) {
 421                                 sym->flags |= SYMBOL_WRITE;
 422                                 sym_calc_value(ds);
 423                                 newval.val = ds->curr.val;
 424                         }
 425                 }
 426                 break;
 427         default:
 428                 ;
 429         }
 430
 431         sym->curr = newval;
 432         if (sym_is_choice(sym) && newval.tri == yes)
 433                 sym->curr.val = sym_calc_choice(sym);
 434         sym_validate_range(sym);
 435
 436         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 437                 sym_set_changed(sym);
 438                 if (modules_sym == sym) {
 439                         sym_set_all_changed();
 440                         modules_val = modules_sym->curr.tri;
 441                 }
 442         }
 443
 444         if (sym_is_choice(sym)) {
 445                 struct symbol *choice_sym;
 446
 447                 prop = sym_get_choice_prop(sym);
 448                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 449                         if ((sym->flags & SYMBOL_WRITE) &&
 450                             choice_sym->visible != no)
 451                                 choice_sym->flags |= SYMBOL_WRITE;
 452                         if (sym->flags & SYMBOL_CHANGED)
 453                                 sym_set_changed(choice_sym);
 454                 }
 455         }
 456
 457         if (sym->flags & SYMBOL_NO_WRITE)
 458                 sym->flags &= ~SYMBOL_WRITE;
 459
 460         if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
 461                 set_all_choice_values(sym);
 462 }
 463
 464 void sym_clear_all_valid(void)
 465 {
 466         struct symbol *sym;
 467         int i;
 468
 469         for_all_symbols(i, sym)
 470                 sym->flags &= ~SYMBOL_VALID;
 471         sym_add_change_count(1);
 472         sym_calc_value(modules_sym);
 473 }
 474
 475 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 476 {
 477         int type = sym_get_type(sym);
 478
 479         if (sym->visible == no)
 480                 return false;
 481
 482         if (type != S_BOOLEAN && type != S_TRISTATE)
 483                 return false;
 484
 485         if (type == S_BOOLEAN && val == mod)
 486                 return false;
 487         if (sym->visible <= sym->rev_dep.tri)
 488                 return false;
 489         if (sym->implied.tri == yes && val == mod)
 490                 return false;
 491         if (sym_is_choice_value(sym) && sym->visible == yes)
 492                 return val == yes;
 493         return val >= sym->rev_dep.tri && val <= sym->visible;
 494 }
 495
 496 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 497 {
 498         tristate oldval = sym_get_tristate_value(sym);
 499
 500         if (oldval != val && !sym_tristate_within_range(sym, val))
 501                 return false;
 502
 503         if (!(sym->flags & SYMBOL_DEF_USER)) {
 504                 sym->flags |= SYMBOL_DEF_USER;
 505                 sym_set_changed(sym);
 506         }
 507         /*
 508          * setting a choice value also resets the new flag of the choice
 509          * symbol and all other choice values.
 510          */
 511         if (sym_is_choice_value(sym) && val == yes) {
 512                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 513                 struct property *prop;
 514                 struct expr *e;
 515
 516                 cs->def[S_DEF_USER].val = sym;
 517                 cs->flags |= SYMBOL_DEF_USER;
 518                 prop = sym_get_choice_prop(cs);
 519                 for (e = prop->expr; e; e = e->left.expr) {
 520                         if (e->right.sym->visible != no)
 521                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 522                 }
 523         }
 524
 525         sym->def[S_DEF_USER].tri = val;
 526         if (oldval != val)
 527                 sym_clear_all_valid();
 528
 529         return true;
 530 }
 531
 532 tristate sym_toggle_tristate_value(struct symbol *sym)
 533 {
 534         tristate oldval, newval;
 535
 536         oldval = newval = sym_get_tristate_value(sym);
 537         do {
 538                 switch (newval) {
 539                 case no:
 540                         newval = mod;
 541                         break;
 542                 case mod:
 543                         newval = yes;
 544                         break;
 545                 case yes:
 546                         newval = no;
 547                         break;
 548                 }
 549                 if (sym_set_tristate_value(sym, newval))
 550                         break;
 551         } while (oldval != newval);
 552         return newval;
 553 }
 554
 555 bool sym_string_valid(struct symbol *sym, const char *str)
 556 {
 557         signed char ch;
 558
 559         switch (sym->type) {
 560         case S_STRING:
 561                 return true;
 562         case S_INT:
 563                 ch = *str++;
 564                 if (ch == '-')
 565                         ch = *str++;
 566                 if (!isdigit(ch))
 567                         return false;
 568                 if (ch == '0' && *str != 0)
 569                         return false;
 570                 while ((ch = *str++)) {
 571                         if (!isdigit(ch))
 572                                 return false;
 573                 }
 574                 return true;
 575         case S_HEX:
 576                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 577                         str += 2;
 578                 ch = *str++;
 579                 do {
 580                         if (!isxdigit(ch))
 581                                 return false;
 582                 } while ((ch = *str++));
 583                 return true;
 584         case S_BOOLEAN:
 585         case S_TRISTATE:
 586                 switch (str[0]) {
 587                 case 'y': case 'Y':
 588                 case 'm': case 'M':
 589                 case 'n': case 'N':
 590                         return true;
 591                 }
 592                 return false;
 593         default:
 594                 return false;
 595         }
 596 }
 597
 598 bool sym_string_within_range(struct symbol *sym, const char *str)
 599 {
 600         struct property *prop;
 601         long long val;
 602
 603         switch (sym->type) {
 604         case S_STRING:
 605                 return sym_string_valid(sym, str);
 606         case S_INT:
 607                 if (!sym_string_valid(sym, str))
 608                         return false;
 609                 prop = sym_get_range_prop(sym);
 610                 if (!prop)
 611                         return true;
 612                 val = strtoll(str, NULL, 10);
 613                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 614                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 615         case S_HEX:
 616                 if (!sym_string_valid(sym, str))
 617                         return false;
 618                 prop = sym_get_range_prop(sym);
 619                 if (!prop)
 620                         return true;
 621                 val = strtoll(str, NULL, 16);
 622                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 623                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 624         case S_BOOLEAN:
 625         case S_TRISTATE:
 626                 switch (str[0]) {
 627                 case 'y': case 'Y':
 628                         return sym_tristate_within_range(sym, yes);
 629                 case 'm': case 'M':
 630                         return sym_tristate_within_range(sym, mod);
 631                 case 'n': case 'N':
 632                         return sym_tristate_within_range(sym, no);
 633                 }
 634                 return false;
 635         default:
 636                 return false;
 637         }
 638 }
 639
 640 bool sym_set_string_value(struct symbol *sym, const char *newval)
 641 {
 642         const char *oldval;
 643         char *val;
 644         int size;
 645
 646         switch (sym->type) {
 647         case S_BOOLEAN:
 648         case S_TRISTATE:
 649                 switch (newval[0]) {
 650                 case 'y': case 'Y':
 651                         return sym_set_tristate_value(sym, yes);
 652                 case 'm': case 'M':
 653                         return sym_set_tristate_value(sym, mod);
 654                 case 'n': case 'N':
 655                         return sym_set_tristate_value(sym, no);
 656                 }
 657                 return false;
 658         default:
 659                 ;
 660         }
 661
 662         if (!sym_string_within_range(sym, newval))
 663                 return false;
 664
 665         if (!(sym->flags & SYMBOL_DEF_USER)) {
 666                 sym->flags |= SYMBOL_DEF_USER;
 667                 sym_set_changed(sym);
 668         }
 669
 670         oldval = sym->def[S_DEF_USER].val;
 671         size = strlen(newval) + 1;
 672         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 673                 size += 2;
 674                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 675                 *val++ = '0';
 676                 *val++ = 'x';
 677         } else if (!oldval || strcmp(oldval, newval))
 678                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 679         else
 680                 return true;
 681
 682         strcpy(val, newval);
 683         free((void *)oldval);
 684         sym_clear_all_valid();
 685
 686         return true;
 687 }
 688
 689 /*
 690  * Find the default value associated to a symbol.
 691  * For tristate symbol handle the modules=n case
 692  * in which case "m" becomes "y".
 693  * If the symbol does not have any default then fallback
 694  * to the fixed default values.
 695  */
 696 const char *sym_get_string_default(struct symbol *sym)
 697 {
 698         struct property *prop;
 699         struct symbol *ds;
 700         const char *str;
 701         tristate val;
 702
 703         sym_calc_visibility(sym);
 704         sym_calc_value(modules_sym);
 705         val = symbol_no.curr.tri;
 706         str = symbol_empty.curr.val;
 707
 708         /* If symbol has a default value look it up */
 709         prop = sym_get_default_prop(sym);
 710         if (prop != NULL) {
 711                 switch (sym->type) {
 712                 case S_BOOLEAN:
 713                 case S_TRISTATE:
 714                         /* The visibility may limit the value from yes => mod */
 715                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 716                         break;
 717                 default:
 718                         /*
 719                          * The following fails to handle the situation
 720                          * where a default value is further limited by
 721                          * the valid range.
 722                          */
 723                         ds = prop_get_symbol(prop);
 724                         if (ds != NULL) {
 725                                 sym_calc_value(ds);
 726                                 str = (const char *)ds->curr.val;
 727                         }
 728                 }
 729         }
 730
 731         /* Handle select statements */
 732         val = EXPR_OR(val, sym->rev_dep.tri);
 733
 734         /* transpose mod to yes if modules are not enabled */
 735         if (val == mod)
 736                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 737                         val = yes;
 738
 739         /* transpose mod to yes if type is bool */
 740         if (sym->type == S_BOOLEAN && val == mod)
 741                 val = yes;
 742
 743         /* adjust the default value if this symbol is implied by another */
 744         if (val < sym->implied.tri)
 745                 val = sym->implied.tri;
 746
 747         switch (sym->type) {
 748         case S_BOOLEAN:
 749         case S_TRISTATE:
 750                 switch (val) {
 751                 case no: return "n";
 752                 case mod: return "m";
 753                 case yes: return "y";
 754                 }
 755         case S_INT:
 756         case S_HEX:
 757                 return str;
 758         case S_STRING:
 759                 return str;
 760         case S_OTHER:
 761         case S_UNKNOWN:
 762                 break;
 763         }
 764         return "";
 765 }
 766
 767 const char *sym_get_string_value(struct symbol *sym)
 768 {
 769         tristate val;
 770
 771         switch (sym->type) {
 772         case S_BOOLEAN:
 773         case S_TRISTATE:
 774                 val = sym_get_tristate_value(sym);
 775                 switch (val) {
 776                 case no:
 777                         return "n";
 778                 case mod:
 779                         sym_calc_value(modules_sym);
 780                         return (modules_sym->curr.tri == no) ? "n" : "m";
 781                 case yes:
 782                         return "y";
 783                 }
 784                 break;
 785         default:
 786                 ;
 787         }
 788         return (const char *)sym->curr.val;
 789 }
 790
 791 bool sym_is_changable(struct symbol *sym)
 792 {
 793         return sym->visible > sym->rev_dep.tri;
 794 }
 795
 796 static unsigned strhash(const char *s)
 797 {
 798         /* fnv32 hash */
 799         unsigned hash = 2166136261U;
 800         for (; *s; s++)
 801                 hash = (hash ^ *s) * 0x01000193;
 802         return hash;
 803 }
 804
 805 struct symbol *sym_lookup(const char *name, int flags)
 806 {
 807         struct symbol *symbol;
 808         char *new_name;
 809         int hash;
 810
 811         if (name) {
 812                 if (name[0] && !name[1]) {
 813                         switch (name[0]) {
 814                         case 'y': return &symbol_yes;
 815                         case 'm': return &symbol_mod;
 816                         case 'n': return &symbol_no;
 817                         }
 818                 }
 819                 hash = strhash(name) % SYMBOL_HASHSIZE;
 820
 821                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 822                         if (symbol->name &&
 823                             !strcmp(symbol->name, name) &&
 824                             (flags ? symbol->flags & flags
 825                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 826                                 return symbol;
 827                 }
 828                 new_name = xstrdup(name);
 829         } else {
 830                 new_name = NULL;
 831                 hash = 0;
 832         }
 833
 834         symbol = xmalloc(sizeof(*symbol));
 835         memset(symbol, 0, sizeof(*symbol));
 836         symbol->name = new_name;
 837         symbol->type = S_UNKNOWN;
 838         symbol->flags |= flags;
 839
 840         symbol->next = symbol_hash[hash];
 841         symbol_hash[hash] = symbol;
 842
 843         return symbol;
 844 }
 845
 846 struct symbol *sym_find(const char *name)
 847 {
 848         struct symbol *symbol = NULL;
 849         int hash = 0;
 850
 851         if (!name)
 852                 return NULL;
 853
 854         if (name[0] && !name[1]) {
 855                 switch (name[0]) {
 856                 case 'y': return &symbol_yes;
 857                 case 'm': return &symbol_mod;
 858                 case 'n': return &symbol_no;
 859                 }
 860         }
 861         hash = strhash(name) % SYMBOL_HASHSIZE;
 862
 863         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 864                 if (symbol->name &&
 865                     !strcmp(symbol->name, name) &&
 866                     !(symbol->flags & SYMBOL_CONST))
 867                                 break;
 868         }
 869
 870         return symbol;
 871 }
 872
 873 const char *sym_escape_string_value(const char *in)
 874 {
 875         const char *p;
 876         size_t reslen;
 877         char *res;
 878         size_t l;
 879
 880         reslen = strlen(in) + strlen("\"\"") + 1;
 881
 882         p = in;
 883         for (;;) {
 884                 l = strcspn(p, "\"\\");
 885                 p += l;
 886
 887                 if (p[0] == '\0')
 888                         break;
 889
 890                 reslen++;
 891                 p++;
 892         }
 893
 894         res = xmalloc(reslen);
 895         res[0] = '\0';
 896
 897         strcat(res, "\"");
 898
 899         p = in;
 900         for (;;) {
 901                 l = strcspn(p, "\"\\");
 902                 strncat(res, p, l);
 903                 p += l;
 904
 905                 if (p[0] == '\0')
 906                         break;
 907
 908                 strcat(res, "\\");
 909                 strncat(res, p++, 1);
 910         }
 911
 912         strcat(res, "\"");
 913         return res;
 914 }
 915
 916 struct sym_match {
 917         struct symbol   *sym;
 918         off_t           so, eo;
 919 };
 920
 921 /* Compare matched symbols as thus:
 922  * - first, symbols that match exactly
 923  * - then, alphabetical sort
 924  */
 925 static int sym_rel_comp(const void *sym1, const void *sym2)
 926 {
 927         const struct sym_match *s1 = sym1;
 928         const struct sym_match *s2 = sym2;
 929         int exact1, exact2;
 930
 931         /* Exact match:
 932          * - if matched length on symbol s1 is the length of that symbol,
 933          *   then this symbol should come first;
 934          * - if matched length on symbol s2 is the length of that symbol,
 935          *   then this symbol should come first.
 936          * Note: since the search can be a regexp, both symbols may match
 937          * exactly; if this is the case, we can't decide which comes first,
 938          * and we fallback to sorting alphabetically.
 939          */
 940         exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
 941         exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
 942         if (exact1 && !exact2)
 943                 return -1;
 944         if (!exact1 && exact2)
 945                 return 1;
 946
 947         /* As a fallback, sort symbols alphabetically */
 948         return strcmp(s1->sym->name, s2->sym->name);
 949 }
 950
 951 struct symbol **sym_re_search(const char *pattern)
 952 {
 953         struct symbol *sym, **sym_arr = NULL;
 954         struct sym_match *sym_match_arr = NULL;
 955         int i, cnt, size;
 956         regex_t re;
 957         regmatch_t match[1];
 958
 959         cnt = size = 0;
 960         /* Skip if empty */
 961         if (strlen(pattern) == 0)
 962                 return NULL;
 963         if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
 964                 return NULL;
 965
 966         for_all_symbols(i, sym) {
 967                 if (sym->flags & SYMBOL_CONST || !sym->name)
 968                         continue;
 969                 if (regexec(&re, sym->name, 1, match, 0))
 970                         continue;
 971                 if (cnt >= size) {
 972                         void *tmp;
 973                         size += 16;
 974                         tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
 975                         if (!tmp)
 976                                 goto sym_re_search_free;
 977                         sym_match_arr = tmp;
 978                 }
 979                 sym_calc_value(sym);
 980                 /* As regexec returned 0, we know we have a match, so
 981                  * we can use match[0].rm_[se]o without further checks
 982                  */
 983                 sym_match_arr[cnt].so = match[0].rm_so;
 984                 sym_match_arr[cnt].eo = match[0].rm_eo;
 985                 sym_match_arr[cnt++].sym = sym;
 986         }
 987         if (sym_match_arr) {
 988                 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
 989                 sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
 990                 if (!sym_arr)
 991                         goto sym_re_search_free;
 992                 for (i = 0; i < cnt; i++)
 993                         sym_arr[i] = sym_match_arr[i].sym;
 994                 sym_arr[cnt] = NULL;
 995         }
 996 sym_re_search_free:
 997         /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
 998         free(sym_match_arr);
 999         regfree(&re);
1000
1001         return sym_arr;
1002 }
1003
1004 /*
1005  * When we check for recursive dependencies we use a stack to save
1006  * current state so we can print out relevant info to user.
1007  * The entries are located on the call stack so no need to free memory.
1008  * Note insert() remove() must always match to properly clear the stack.
1009  */
1010 static struct dep_stack {
1011         struct dep_stack *prev, *next;
1012         struct symbol *sym;
1013         struct property *prop;
1014         struct expr **expr;
1015 } *check_top;
1016
1017 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1018 {
1019         memset(stack, 0, sizeof(*stack));
1020         if (check_top)
1021                 check_top->next = stack;
1022         stack->prev = check_top;
1023         stack->sym = sym;
1024         check_top = stack;
1025 }
1026
1027 static void dep_stack_remove(void)
1028 {
1029         check_top = check_top->prev;
1030         if (check_top)
1031                 check_top->next = NULL;
1032 }
1033
1034 /*
1035  * Called when we have detected a recursive dependency.
1036  * check_top point to the top of the stact so we use
1037  * the ->prev pointer to locate the bottom of the stack.
1038  */
1039 static void sym_check_print_recursive(struct symbol *last_sym)
1040 {
1041         struct dep_stack *stack;
1042         struct symbol *sym, *next_sym;
1043         struct menu *menu = NULL;
1044         struct property *prop;
1045         struct dep_stack cv_stack;
1046
1047         if (sym_is_choice_value(last_sym)) {
1048                 dep_stack_insert(&cv_stack, last_sym);
1049                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1050         }
1051
1052         for (stack = check_top; stack != NULL; stack = stack->prev)
1053                 if (stack->sym == last_sym)
1054                         break;
1055         if (!stack) {
1056                 fprintf(stderr, "unexpected recursive dependency error\n");
1057                 return;
1058         }
1059
1060         for (; stack; stack = stack->next) {
1061                 sym = stack->sym;
1062                 next_sym = stack->next ? stack->next->sym : last_sym;
1063                 prop = stack->prop;
1064                 if (prop == NULL)
1065                         prop = stack->sym->prop;
1066
1067                 /* for choice values find the menu entry (used below) */
1068                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1069                         for (prop = sym->prop; prop; prop = prop->next) {
1070                                 menu = prop->menu;
1071                                 if (prop->menu)
1072                                         break;
1073                         }
1074                 }
1075                 if (stack->sym == last_sym)
1076                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1077                                 prop->file->name, prop->lineno);
1078
1079                 if (sym_is_choice(sym)) {
1080                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1081                                 menu->file->name, menu->lineno,
1082                                 sym->name ? sym->name : "<choice>",
1083                                 next_sym->name ? next_sym->name : "<choice>");
1084                 } else if (sym_is_choice_value(sym)) {
1085                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1086                                 menu->file->name, menu->lineno,
1087                                 sym->name ? sym->name : "<choice>",
1088                                 next_sym->name ? next_sym->name : "<choice>");
1089                 } else if (stack->expr == &sym->dir_dep.expr) {
1090                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1091                                 prop->file->name, prop->lineno,
1092                                 sym->name ? sym->name : "<choice>",
1093                                 next_sym->name ? next_sym->name : "<choice>");
1094                 } else if (stack->expr == &sym->rev_dep.expr) {
1095                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1096                                 prop->file->name, prop->lineno,
1097                                 sym->name ? sym->name : "<choice>",
1098                                 next_sym->name ? next_sym->name : "<choice>");
1099                 } else if (stack->expr == &sym->implied.expr) {
1100                         fprintf(stderr, "%s:%d:\tsymbol %s is implied by %s\n",
1101                                 prop->file->name, prop->lineno,
1102                                 sym->name ? sym->name : "<choice>",
1103                                 next_sym->name ? next_sym->name : "<choice>");
1104                 } else if (stack->expr) {
1105                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1106                                 prop->file->name, prop->lineno,
1107                                 sym->name ? sym->name : "<choice>",
1108                                 prop_get_type_name(prop->type),
1109                                 next_sym->name ? next_sym->name : "<choice>");
1110                 } else {
1111                         fprintf(stderr, "%s:%d:\tsymbol %s %s is visible depending on %s\n",
1112                                 prop->file->name, prop->lineno,
1113                                 sym->name ? sym->name : "<choice>",
1114                                 prop_get_type_name(prop->type),
1115                                 next_sym->name ? next_sym->name : "<choice>");
1116                 }
1117         }
1118
1119         fprintf(stderr,
1120                 "For a resolution refer to Documentation/kbuild/kconfig-language.txt\n"
1121                 "subsection \"Kconfig recursive dependency limitations\"\n"
1122                 "\n");
1123
1124         if (check_top == &cv_stack)
1125                 dep_stack_remove();
1126 }
1127
1128 static struct symbol *sym_check_expr_deps(struct expr *e)
1129 {
1130         struct symbol *sym;
1131
1132         if (!e)
1133                 return NULL;
1134         switch (e->type) {
1135         case E_OR:
1136         case E_AND:
1137                 sym = sym_check_expr_deps(e->left.expr);
1138                 if (sym)
1139                         return sym;
1140                 return sym_check_expr_deps(e->right.expr);
1141         case E_NOT:
1142                 return sym_check_expr_deps(e->left.expr);
1143         case E_EQUAL:
1144         case E_GEQ:
1145         case E_GTH:
1146         case E_LEQ:
1147         case E_LTH:
1148         case E_UNEQUAL:
1149                 sym = sym_check_deps(e->left.sym);
1150                 if (sym)
1151                         return sym;
1152                 return sym_check_deps(e->right.sym);
1153         case E_SYMBOL:
1154                 return sym_check_deps(e->left.sym);
1155         default:
1156                 break;
1157         }
1158         fprintf(stderr, "Oops! How to check %d?\n", e->type);
1159         return NULL;
1160 }
1161
1162 /* return NULL when dependencies are OK */
1163 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1164 {
1165         struct symbol *sym2;
1166         struct property *prop;
1167         struct dep_stack stack;
1168
1169         dep_stack_insert(&stack, sym);
1170
1171         stack.expr = &sym->dir_dep.expr;
1172         sym2 = sym_check_expr_deps(sym->dir_dep.expr);
1173         if (sym2)
1174                 goto out;
1175
1176         stack.expr = &sym->rev_dep.expr;
1177         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1178         if (sym2)
1179                 goto out;
1180
1181         stack.expr = &sym->implied.expr;
1182         sym2 = sym_check_expr_deps(sym->implied.expr);
1183         if (sym2)
1184                 goto out;
1185
1186         stack.expr = NULL;
1187
1188         for (prop = sym->prop; prop; prop = prop->next) {
1189                 if (prop->type == P_CHOICE || prop->type == P_SELECT ||
1190                     prop->type == P_IMPLY)
1191                         continue;
1192                 stack.prop = prop;
1193                 sym2 = sym_check_expr_deps(prop->visible.expr);
1194                 if (sym2)
1195                         break;
1196                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1197                         continue;
1198                 stack.expr = &prop->expr;
1199                 sym2 = sym_check_expr_deps(prop->expr);
1200                 if (sym2)
1201                         break;
1202                 stack.expr = NULL;
1203         }
1204
1205 out:
1206         dep_stack_remove();
1207
1208         return sym2;
1209 }
1210
1211 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1212 {
1213         struct symbol *sym, *sym2;
1214         struct property *prop;
1215         struct expr *e;
1216         struct dep_stack stack;
1217
1218         dep_stack_insert(&stack, choice);
1219
1220         prop = sym_get_choice_prop(choice);
1221         expr_list_for_each_sym(prop->expr, e, sym)
1222                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1223
1224         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1225         sym2 = sym_check_sym_deps(choice);
1226         choice->flags &= ~SYMBOL_CHECK;
1227         if (sym2)
1228                 goto out;
1229
1230         expr_list_for_each_sym(prop->expr, e, sym) {
1231                 sym2 = sym_check_sym_deps(sym);
1232                 if (sym2)
1233                         break;
1234         }
1235 out:
1236         expr_list_for_each_sym(prop->expr, e, sym)
1237                 sym->flags &= ~SYMBOL_CHECK;
1238
1239         if (sym2 && sym_is_choice_value(sym2) &&
1240             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1241                 sym2 = choice;
1242
1243         dep_stack_remove();
1244
1245         return sym2;
1246 }
1247
1248 struct symbol *sym_check_deps(struct symbol *sym)
1249 {
1250         struct symbol *sym2;
1251         struct property *prop;
1252
1253         if (sym->flags & SYMBOL_CHECK) {
1254                 sym_check_print_recursive(sym);
1255                 return sym;
1256         }
1257         if (sym->flags & SYMBOL_CHECKED)
1258                 return NULL;
1259
1260         if (sym_is_choice_value(sym)) {
1261                 struct dep_stack stack;
1262
1263                 /* for choice groups start the check with main choice symbol */
1264                 dep_stack_insert(&stack, sym);
1265                 prop = sym_get_choice_prop(sym);
1266                 sym2 = sym_check_deps(prop_get_symbol(prop));
1267                 dep_stack_remove();
1268         } else if (sym_is_choice(sym)) {
1269                 sym2 = sym_check_choice_deps(sym);
1270         } else {
1271                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1272                 sym2 = sym_check_sym_deps(sym);
1273                 sym->flags &= ~SYMBOL_CHECK;
1274         }
1275
1276         return sym2;
1277 }
1278
1279 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1280 {
1281         struct property *prop;
1282         struct property **propp;
1283
1284         prop = xmalloc(sizeof(*prop));
1285         memset(prop, 0, sizeof(*prop));
1286         prop->type = type;
1287         prop->sym = sym;
1288         prop->file = current_file;
1289         prop->lineno = zconf_lineno();
1290
1291         /* append property to the prop list of symbol */
1292         if (sym) {
1293                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1294                         ;
1295                 *propp = prop;
1296         }
1297
1298         return prop;
1299 }
1300
1301 struct symbol *prop_get_symbol(struct property *prop)
1302 {
1303         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1304                            prop->expr->type == E_LIST))
1305                 return prop->expr->left.sym;
1306         return NULL;
1307 }
1308
1309 const char *prop_get_type_name(enum prop_type type)
1310 {
1311         switch (type) {
1312         case P_PROMPT:
1313                 return "prompt";
1314         case P_COMMENT:
1315                 return "comment";
1316         case P_MENU:
1317                 return "menu";
1318         case P_DEFAULT:
1319                 return "default";
1320         case P_CHOICE:
1321                 return "choice";
1322         case P_SELECT:
1323                 return "select";
1324         case P_IMPLY:
1325                 return "imply";
1326         case P_RANGE:
1327                 return "range";
1328         case P_SYMBOL:
1329                 return "symbol";
1330         case P_UNKNOWN:
1331                 break;
1332         }
1333         return "unknown";
1334 }