scripts/kconfig/symbol.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <ctype.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <regex.h>
  10 #include <sys/utsname.h>
  11
  12 #include "lkc.h"
  13
  14 struct symbol symbol_yes = {
  15         .name = "y",
  16         .curr = { "y", yes },
  17         .flags = SYMBOL_CONST|SYMBOL_VALID,
  18 }, symbol_mod = {
  19         .name = "m",
  20         .curr = { "m", mod },
  21         .flags = SYMBOL_CONST|SYMBOL_VALID,
  22 }, symbol_no = {
  23         .name = "n",
  24         .curr = { "n", no },
  25         .flags = SYMBOL_CONST|SYMBOL_VALID,
  26 }, symbol_empty = {
  27         .name = "",
  28         .curr = { "", no },
  29         .flags = SYMBOL_VALID,
  30 };
  31
  32 struct symbol *sym_defconfig_list;
  33 struct symbol *modules_sym;
  34 tristate modules_val;
  35
  36 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 struct property *sym_get_env_prop(struct symbol *sym)
  80 {
  81         struct property *prop;
  82
  83         for_all_properties(sym, prop, P_ENV)
  84                 return prop;
  85         return NULL;
  86 }
  87
  88 static struct property *sym_get_default_prop(struct symbol *sym)
  89 {
  90         struct property *prop;
  91
  92         for_all_defaults(sym, prop) {
  93                 prop->visible.tri = expr_calc_value(prop->visible.expr);
  94                 if (prop->visible.tri != no)
  95                         return prop;
  96         }
  97         return NULL;
  98 }
  99
 100 static struct property *sym_get_range_prop(struct symbol *sym)
 101 {
 102         struct property *prop;
 103
 104         for_all_properties(sym, prop, P_RANGE) {
 105                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 106                 if (prop->visible.tri != no)
 107                         return prop;
 108         }
 109         return NULL;
 110 }
 111
 112 static long long sym_get_range_val(struct symbol *sym, int base)
 113 {
 114         sym_calc_value(sym);
 115         switch (sym->type) {
 116         case S_INT:
 117                 base = 10;
 118                 break;
 119         case S_HEX:
 120                 base = 16;
 121                 break;
 122         default:
 123                 break;
 124         }
 125         return strtoll(sym->curr.val, NULL, base);
 126 }
 127
 128 static void sym_validate_range(struct symbol *sym)
 129 {
 130         struct property *prop;
 131         int base;
 132         long long val, val2;
 133         char str[64];
 134
 135         switch (sym->type) {
 136         case S_INT:
 137                 base = 10;
 138                 break;
 139         case S_HEX:
 140                 base = 16;
 141                 break;
 142         default:
 143                 return;
 144         }
 145         prop = sym_get_range_prop(sym);
 146         if (!prop)
 147                 return;
 148         val = strtoll(sym->curr.val, NULL, base);
 149         val2 = sym_get_range_val(prop->expr->left.sym, base);
 150         if (val >= val2) {
 151                 val2 = sym_get_range_val(prop->expr->right.sym, base);
 152                 if (val <= val2)
 153                         return;
 154         }
 155         if (sym->type == S_INT)
 156                 sprintf(str, "%lld", val2);
 157         else
 158                 sprintf(str, "0x%llx", val2);
 159         sym->curr.val = xstrdup(str);
 160 }
 161
 162 static void sym_set_changed(struct symbol *sym)
 163 {
 164         struct property *prop;
 165
 166         sym->flags |= SYMBOL_CHANGED;
 167         for (prop = sym->prop; prop; prop = prop->next) {
 168                 if (prop->menu)
 169                         prop->menu->flags |= MENU_CHANGED;
 170         }
 171 }
 172
 173 static void sym_set_all_changed(void)
 174 {
 175         struct symbol *sym;
 176         int i;
 177
 178         for_all_symbols(i, sym)
 179                 sym_set_changed(sym);
 180 }
 181
 182 static void sym_calc_visibility(struct symbol *sym)
 183 {
 184         struct property *prop;
 185         struct symbol *choice_sym = NULL;
 186         tristate tri;
 187
 188         /* any prompt visible? */
 189         tri = no;
 190
 191         if (sym_is_choice_value(sym))
 192                 choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
 193
 194         for_all_prompts(sym, prop) {
 195                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 196                 /*
 197                  * Tristate choice_values with visibility 'mod' are
 198                  * not visible if the corresponding choice's value is
 199                  * 'yes'.
 200                  */
 201                 if (choice_sym && sym->type == S_TRISTATE &&
 202                     prop->visible.tri == mod && choice_sym->curr.tri == yes)
 203                         prop->visible.tri = no;
 204
 205                 tri = EXPR_OR(tri, prop->visible.tri);
 206         }
 207         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 208                 tri = yes;
 209         if (sym->visible != tri) {
 210                 sym->visible = tri;
 211                 sym_set_changed(sym);
 212         }
 213         if (sym_is_choice_value(sym))
 214                 return;
 215         /* defaulting to "yes" if no explicit "depends on" are given */
 216         tri = yes;
 217         if (sym->dir_dep.expr)
 218                 tri = expr_calc_value(sym->dir_dep.expr);
 219         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 220                 tri = yes;
 221         if (sym->dir_dep.tri != tri) {
 222                 sym->dir_dep.tri = tri;
 223                 sym_set_changed(sym);
 224         }
 225         tri = no;
 226         if (sym->rev_dep.expr)
 227                 tri = expr_calc_value(sym->rev_dep.expr);
 228         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 229                 tri = yes;
 230         if (sym->rev_dep.tri != tri) {
 231                 sym->rev_dep.tri = tri;
 232                 sym_set_changed(sym);
 233         }
 234         tri = no;
 235         if (sym->implied.expr && sym->dir_dep.tri != no)
 236                 tri = expr_calc_value(sym->implied.expr);
 237         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 238                 tri = yes;
 239         if (sym->implied.tri != tri) {
 240                 sym->implied.tri = tri;
 241                 sym_set_changed(sym);
 242         }
 243 }
 244
 245 /*
 246  * Find the default symbol for a choice.
 247  * First try the default values for the choice symbol
 248  * Next locate the first visible choice value
 249  * Return NULL if none was found
 250  */
 251 struct symbol *sym_choice_default(struct symbol *sym)
 252 {
 253         struct symbol *def_sym;
 254         struct property *prop;
 255         struct expr *e;
 256
 257         /* any of the defaults visible? */
 258         for_all_defaults(sym, prop) {
 259                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 260                 if (prop->visible.tri == no)
 261                         continue;
 262                 def_sym = prop_get_symbol(prop);
 263                 if (def_sym->visible != no)
 264                         return def_sym;
 265         }
 266
 267         /* just get the first visible value */
 268         prop = sym_get_choice_prop(sym);
 269         expr_list_for_each_sym(prop->expr, e, def_sym)
 270                 if (def_sym->visible != no)
 271                         return def_sym;
 272
 273         /* failed to locate any defaults */
 274         return NULL;
 275 }
 276
 277 static struct symbol *sym_calc_choice(struct symbol *sym)
 278 {
 279         struct symbol *def_sym;
 280         struct property *prop;
 281         struct expr *e;
 282         int flags;
 283
 284         /* first calculate all choice values' visibilities */
 285         flags = sym->flags;
 286         prop = sym_get_choice_prop(sym);
 287         expr_list_for_each_sym(prop->expr, e, def_sym) {
 288                 sym_calc_visibility(def_sym);
 289                 if (def_sym->visible != no)
 290                         flags &= def_sym->flags;
 291         }
 292
 293         sym->flags &= flags | ~SYMBOL_DEF_USER;
 294
 295         /* is the user choice visible? */
 296         def_sym = sym->def[S_DEF_USER].val;
 297         if (def_sym && def_sym->visible != no)
 298                 return def_sym;
 299
 300         def_sym = sym_choice_default(sym);
 301
 302         if (def_sym == NULL)
 303                 /* no choice? reset tristate value */
 304                 sym->curr.tri = no;
 305
 306         return def_sym;
 307 }
 308
 309 static void sym_warn_unmet_dep(struct symbol *sym)
 310 {
 311         struct gstr gs = str_new();
 312
 313         str_printf(&gs,
 314                    "\nWARNING: unmet direct dependencies detected for %s\n",
 315                    sym->name);
 316         str_printf(&gs,
 317                    "  Depends on [%c]: ",
 318                    sym->dir_dep.tri == mod ? 'm' : 'n');
 319         expr_gstr_print(sym->dir_dep.expr, &gs);
 320         str_printf(&gs, "\n");
 321
 322         expr_gstr_print_revdep(sym->rev_dep.expr, &gs, yes,
 323                                "  Selected by [y]:\n");
 324         expr_gstr_print_revdep(sym->rev_dep.expr, &gs, mod,
 325                                "  Selected by [m]:\n");
 326
 327         fputs(str_get(&gs), stderr);
 328 }
 329
 330 void sym_calc_value(struct symbol *sym)
 331 {
 332         struct symbol_value newval, oldval;
 333         struct property *prop;
 334         struct expr *e;
 335
 336         if (!sym)
 337                 return;
 338
 339         if (sym->flags & SYMBOL_VALID)
 340                 return;
 341
 342         if (sym_is_choice_value(sym) &&
 343             sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
 344                 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
 345                 prop = sym_get_choice_prop(sym);
 346                 sym_calc_value(prop_get_symbol(prop));
 347         }
 348
 349         sym->flags |= SYMBOL_VALID;
 350
 351         oldval = sym->curr;
 352
 353         switch (sym->type) {
 354         case S_INT:
 355         case S_HEX:
 356         case S_STRING:
 357                 newval = symbol_empty.curr;
 358                 break;
 359         case S_BOOLEAN:
 360         case S_TRISTATE:
 361                 newval = symbol_no.curr;
 362                 break;
 363         default:
 364                 sym->curr.val = sym->name;
 365                 sym->curr.tri = no;
 366                 return;
 367         }
 368         sym->flags &= ~SYMBOL_WRITE;
 369
 370         sym_calc_visibility(sym);
 371
 372         if (sym->visible != no)
 373                 sym->flags |= SYMBOL_WRITE;
 374
 375         /* set default if recursively called */
 376         sym->curr = newval;
 377
 378         switch (sym_get_type(sym)) {
 379         case S_BOOLEAN:
 380         case S_TRISTATE:
 381                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 382                         prop = sym_get_choice_prop(sym);
 383                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 384                 } else {
 385                         if (sym->visible != no) {
 386                                 /* if the symbol is visible use the user value
 387                                  * if available, otherwise try the default value
 388                                  */
 389                                 if (sym_has_value(sym)) {
 390                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 391                                                               sym->visible);
 392                                         goto calc_newval;
 393                                 }
 394                         }
 395                         if (sym->rev_dep.tri != no)
 396                                 sym->flags |= SYMBOL_WRITE;
 397                         if (!sym_is_choice(sym)) {
 398                                 prop = sym_get_default_prop(sym);
 399                                 if (prop) {
 400                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 401                                                               prop->visible.tri);
 402                                         if (newval.tri != no)
 403                                                 sym->flags |= SYMBOL_WRITE;
 404                                 }
 405                                 if (sym->implied.tri != no) {
 406                                         sym->flags |= SYMBOL_WRITE;
 407                                         newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
 408                                 }
 409                         }
 410                 calc_newval:
 411                         if (sym->dir_dep.tri < sym->rev_dep.tri)
 412                                 sym_warn_unmet_dep(sym);
 413                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 414                 }
 415                 if (newval.tri == mod &&
 416                     (sym_get_type(sym) == S_BOOLEAN || sym->implied.tri == yes))
 417                         newval.tri = yes;
 418                 break;
 419         case S_STRING:
 420         case S_HEX:
 421         case S_INT:
 422                 if (sym->visible != no && sym_has_value(sym)) {
 423                         newval.val = sym->def[S_DEF_USER].val;
 424                         break;
 425                 }
 426                 prop = sym_get_default_prop(sym);
 427                 if (prop) {
 428                         struct symbol *ds = prop_get_symbol(prop);
 429                         if (ds) {
 430                                 sym->flags |= SYMBOL_WRITE;
 431                                 sym_calc_value(ds);
 432                                 newval.val = ds->curr.val;
 433                         }
 434                 }
 435                 break;
 436         default:
 437                 ;
 438         }
 439
 440         sym->curr = newval;
 441         if (sym_is_choice(sym) && newval.tri == yes)
 442                 sym->curr.val = sym_calc_choice(sym);
 443         sym_validate_range(sym);
 444
 445         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 446                 sym_set_changed(sym);
 447                 if (modules_sym == sym) {
 448                         sym_set_all_changed();
 449                         modules_val = modules_sym->curr.tri;
 450                 }
 451         }
 452
 453         if (sym_is_choice(sym)) {
 454                 struct symbol *choice_sym;
 455
 456                 prop = sym_get_choice_prop(sym);
 457                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 458                         if ((sym->flags & SYMBOL_WRITE) &&
 459                             choice_sym->visible != no)
 460                                 choice_sym->flags |= SYMBOL_WRITE;
 461                         if (sym->flags & SYMBOL_CHANGED)
 462                                 sym_set_changed(choice_sym);
 463                 }
 464         }
 465
 466         if (sym->flags & SYMBOL_AUTO)
 467                 sym->flags &= ~SYMBOL_WRITE;
 468
 469         if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
 470                 set_all_choice_values(sym);
 471 }
 472
 473 void sym_clear_all_valid(void)
 474 {
 475         struct symbol *sym;
 476         int i;
 477
 478         for_all_symbols(i, sym)
 479                 sym->flags &= ~SYMBOL_VALID;
 480         sym_add_change_count(1);
 481         sym_calc_value(modules_sym);
 482 }
 483
 484 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 485 {
 486         int type = sym_get_type(sym);
 487
 488         if (sym->visible == no)
 489                 return false;
 490
 491         if (type != S_BOOLEAN && type != S_TRISTATE)
 492                 return false;
 493
 494         if (type == S_BOOLEAN && val == mod)
 495                 return false;
 496         if (sym->visible <= sym->rev_dep.tri)
 497                 return false;
 498         if (sym->implied.tri == yes && val == mod)
 499                 return false;
 500         if (sym_is_choice_value(sym) && sym->visible == yes)
 501                 return val == yes;
 502         return val >= sym->rev_dep.tri && val <= sym->visible;
 503 }
 504
 505 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 506 {
 507         tristate oldval = sym_get_tristate_value(sym);
 508
 509         if (oldval != val && !sym_tristate_within_range(sym, val))
 510                 return false;
 511
 512         if (!(sym->flags & SYMBOL_DEF_USER)) {
 513                 sym->flags |= SYMBOL_DEF_USER;
 514                 sym_set_changed(sym);
 515         }
 516         /*
 517          * setting a choice value also resets the new flag of the choice
 518          * symbol and all other choice values.
 519          */
 520         if (sym_is_choice_value(sym) && val == yes) {
 521                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 522                 struct property *prop;
 523                 struct expr *e;
 524
 525                 cs->def[S_DEF_USER].val = sym;
 526                 cs->flags |= SYMBOL_DEF_USER;
 527                 prop = sym_get_choice_prop(cs);
 528                 for (e = prop->expr; e; e = e->left.expr) {
 529                         if (e->right.sym->visible != no)
 530                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 531                 }
 532         }
 533
 534         sym->def[S_DEF_USER].tri = val;
 535         if (oldval != val)
 536                 sym_clear_all_valid();
 537
 538         return true;
 539 }
 540
 541 tristate sym_toggle_tristate_value(struct symbol *sym)
 542 {
 543         tristate oldval, newval;
 544
 545         oldval = newval = sym_get_tristate_value(sym);
 546         do {
 547                 switch (newval) {
 548                 case no:
 549                         newval = mod;
 550                         break;
 551                 case mod:
 552                         newval = yes;
 553                         break;
 554                 case yes:
 555                         newval = no;
 556                         break;
 557                 }
 558                 if (sym_set_tristate_value(sym, newval))
 559                         break;
 560         } while (oldval != newval);
 561         return newval;
 562 }
 563
 564 bool sym_string_valid(struct symbol *sym, const char *str)
 565 {
 566         signed char ch;
 567
 568         switch (sym->type) {
 569         case S_STRING:
 570                 return true;
 571         case S_INT:
 572                 ch = *str++;
 573                 if (ch == '-')
 574                         ch = *str++;
 575                 if (!isdigit(ch))
 576                         return false;
 577                 if (ch == '0' && *str != 0)
 578                         return false;
 579                 while ((ch = *str++)) {
 580                         if (!isdigit(ch))
 581                                 return false;
 582                 }
 583                 return true;
 584         case S_HEX:
 585                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 586                         str += 2;
 587                 ch = *str++;
 588                 do {
 589                         if (!isxdigit(ch))
 590                                 return false;
 591                 } while ((ch = *str++));
 592                 return true;
 593         case S_BOOLEAN:
 594         case S_TRISTATE:
 595                 switch (str[0]) {
 596                 case 'y': case 'Y':
 597                 case 'm': case 'M':
 598                 case 'n': case 'N':
 599                         return true;
 600                 }
 601                 return false;
 602         default:
 603                 return false;
 604         }
 605 }
 606
 607 bool sym_string_within_range(struct symbol *sym, const char *str)
 608 {
 609         struct property *prop;
 610         long long val;
 611
 612         switch (sym->type) {
 613         case S_STRING:
 614                 return sym_string_valid(sym, str);
 615         case S_INT:
 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, 10);
 622                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 623                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 624         case S_HEX:
 625                 if (!sym_string_valid(sym, str))
 626                         return false;
 627                 prop = sym_get_range_prop(sym);
 628                 if (!prop)
 629                         return true;
 630                 val = strtoll(str, NULL, 16);
 631                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 632                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 633         case S_BOOLEAN:
 634         case S_TRISTATE:
 635                 switch (str[0]) {
 636                 case 'y': case 'Y':
 637                         return sym_tristate_within_range(sym, yes);
 638                 case 'm': case 'M':
 639                         return sym_tristate_within_range(sym, mod);
 640                 case 'n': case 'N':
 641                         return sym_tristate_within_range(sym, no);
 642                 }
 643                 return false;
 644         default:
 645                 return false;
 646         }
 647 }
 648
 649 bool sym_set_string_value(struct symbol *sym, const char *newval)
 650 {
 651         const char *oldval;
 652         char *val;
 653         int size;
 654
 655         switch (sym->type) {
 656         case S_BOOLEAN:
 657         case S_TRISTATE:
 658                 switch (newval[0]) {
 659                 case 'y': case 'Y':
 660                         return sym_set_tristate_value(sym, yes);
 661                 case 'm': case 'M':
 662                         return sym_set_tristate_value(sym, mod);
 663                 case 'n': case 'N':
 664                         return sym_set_tristate_value(sym, no);
 665                 }
 666                 return false;
 667         default:
 668                 ;
 669         }
 670
 671         if (!sym_string_within_range(sym, newval))
 672                 return false;
 673
 674         if (!(sym->flags & SYMBOL_DEF_USER)) {
 675                 sym->flags |= SYMBOL_DEF_USER;
 676                 sym_set_changed(sym);
 677         }
 678
 679         oldval = sym->def[S_DEF_USER].val;
 680         size = strlen(newval) + 1;
 681         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 682                 size += 2;
 683                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 684                 *val++ = '0';
 685                 *val++ = 'x';
 686         } else if (!oldval || strcmp(oldval, newval))
 687                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 688         else
 689                 return true;
 690
 691         strcpy(val, newval);
 692         free((void *)oldval);
 693         sym_clear_all_valid();
 694
 695         return true;
 696 }
 697
 698 /*
 699  * Find the default value associated to a symbol.
 700  * For tristate symbol handle the modules=n case
 701  * in which case "m" becomes "y".
 702  * If the symbol does not have any default then fallback
 703  * to the fixed default values.
 704  */
 705 const char *sym_get_string_default(struct symbol *sym)
 706 {
 707         struct property *prop;
 708         struct symbol *ds;
 709         const char *str;
 710         tristate val;
 711
 712         sym_calc_visibility(sym);
 713         sym_calc_value(modules_sym);
 714         val = symbol_no.curr.tri;
 715         str = symbol_empty.curr.val;
 716
 717         /* If symbol has a default value look it up */
 718         prop = sym_get_default_prop(sym);
 719         if (prop != NULL) {
 720                 switch (sym->type) {
 721                 case S_BOOLEAN:
 722                 case S_TRISTATE:
 723                         /* The visibility may limit the value from yes => mod */
 724                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 725                         break;
 726                 default:
 727                         /*
 728                          * The following fails to handle the situation
 729                          * where a default value is further limited by
 730                          * the valid range.
 731                          */
 732                         ds = prop_get_symbol(prop);
 733                         if (ds != NULL) {
 734                                 sym_calc_value(ds);
 735                                 str = (const char *)ds->curr.val;
 736                         }
 737                 }
 738         }
 739
 740         /* Handle select statements */
 741         val = EXPR_OR(val, sym->rev_dep.tri);
 742
 743         /* transpose mod to yes if modules are not enabled */
 744         if (val == mod)
 745                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 746                         val = yes;
 747
 748         /* transpose mod to yes if type is bool */
 749         if (sym->type == S_BOOLEAN && val == mod)
 750                 val = yes;
 751
 752         /* adjust the default value if this symbol is implied by another */
 753         if (val < sym->implied.tri)
 754                 val = sym->implied.tri;
 755
 756         switch (sym->type) {
 757         case S_BOOLEAN:
 758         case S_TRISTATE:
 759                 switch (val) {
 760                 case no: return "n";
 761                 case mod: return "m";
 762                 case yes: return "y";
 763                 }
 764         case S_INT:
 765         case S_HEX:
 766                 return str;
 767         case S_STRING:
 768                 return str;
 769         case S_OTHER:
 770         case S_UNKNOWN:
 771                 break;
 772         }
 773         return "";
 774 }
 775
 776 const char *sym_get_string_value(struct symbol *sym)
 777 {
 778         tristate val;
 779
 780         switch (sym->type) {
 781         case S_BOOLEAN:
 782         case S_TRISTATE:
 783                 val = sym_get_tristate_value(sym);
 784                 switch (val) {
 785                 case no:
 786                         return "n";
 787                 case mod:
 788                         sym_calc_value(modules_sym);
 789                         return (modules_sym->curr.tri == no) ? "n" : "m";
 790                 case yes:
 791                         return "y";
 792                 }
 793                 break;
 794         default:
 795                 ;
 796         }
 797         return (const char *)sym->curr.val;
 798 }
 799
 800 bool sym_is_changable(struct symbol *sym)
 801 {
 802         return sym->visible > sym->rev_dep.tri;
 803 }
 804
 805 static unsigned strhash(const char *s)
 806 {
 807         /* fnv32 hash */
 808         unsigned hash = 2166136261U;
 809         for (; *s; s++)
 810                 hash = (hash ^ *s) * 0x01000193;
 811         return hash;
 812 }
 813
 814 struct symbol *sym_lookup(const char *name, int flags)
 815 {
 816         struct symbol *symbol;
 817         char *new_name;
 818         int hash;
 819
 820         if (name) {
 821                 if (name[0] && !name[1]) {
 822                         switch (name[0]) {
 823                         case 'y': return &symbol_yes;
 824                         case 'm': return &symbol_mod;
 825                         case 'n': return &symbol_no;
 826                         }
 827                 }
 828                 hash = strhash(name) % SYMBOL_HASHSIZE;
 829
 830                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 831                         if (symbol->name &&
 832                             !strcmp(symbol->name, name) &&
 833                             (flags ? symbol->flags & flags
 834                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 835                                 return symbol;
 836                 }
 837                 new_name = xstrdup(name);
 838         } else {
 839                 new_name = NULL;
 840                 hash = 0;
 841         }
 842
 843         symbol = xmalloc(sizeof(*symbol));
 844         memset(symbol, 0, sizeof(*symbol));
 845         symbol->name = new_name;
 846         symbol->type = S_UNKNOWN;
 847         symbol->flags |= flags;
 848
 849         symbol->next = symbol_hash[hash];
 850         symbol_hash[hash] = symbol;
 851
 852         return symbol;
 853 }
 854
 855 struct symbol *sym_find(const char *name)
 856 {
 857         struct symbol *symbol = NULL;
 858         int hash = 0;
 859
 860         if (!name)
 861                 return NULL;
 862
 863         if (name[0] && !name[1]) {
 864                 switch (name[0]) {
 865                 case 'y': return &symbol_yes;
 866                 case 'm': return &symbol_mod;
 867                 case 'n': return &symbol_no;
 868                 }
 869         }
 870         hash = strhash(name) % SYMBOL_HASHSIZE;
 871
 872         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 873                 if (symbol->name &&
 874                     !strcmp(symbol->name, name) &&
 875                     !(symbol->flags & SYMBOL_CONST))
 876                                 break;
 877         }
 878
 879         return symbol;
 880 }
 881
 882 const char *sym_escape_string_value(const char *in)
 883 {
 884         const char *p;
 885         size_t reslen;
 886         char *res;
 887         size_t l;
 888
 889         reslen = strlen(in) + strlen("\"\"") + 1;
 890
 891         p = in;
 892         for (;;) {
 893                 l = strcspn(p, "\"\\");
 894                 p += l;
 895
 896                 if (p[0] == '\0')
 897                         break;
 898
 899                 reslen++;
 900                 p++;
 901         }
 902
 903         res = xmalloc(reslen);
 904         res[0] = '\0';
 905
 906         strcat(res, "\"");
 907
 908         p = in;
 909         for (;;) {
 910                 l = strcspn(p, "\"\\");
 911                 strncat(res, p, l);
 912                 p += l;
 913
 914                 if (p[0] == '\0')
 915                         break;
 916
 917                 strcat(res, "\\");
 918                 strncat(res, p++, 1);
 919         }
 920
 921         strcat(res, "\"");
 922         return res;
 923 }
 924
 925 struct sym_match {
 926         struct symbol   *sym;
 927         off_t           so, eo;
 928 };
 929
 930 /* Compare matched symbols as thus:
 931  * - first, symbols that match exactly
 932  * - then, alphabetical sort
 933  */
 934 static int sym_rel_comp(const void *sym1, const void *sym2)
 935 {
 936         const struct sym_match *s1 = sym1;
 937         const struct sym_match *s2 = sym2;
 938         int exact1, exact2;
 939
 940         /* Exact match:
 941          * - if matched length on symbol s1 is the length of that symbol,
 942          *   then this symbol should come first;
 943          * - if matched length on symbol s2 is the length of that symbol,
 944          *   then this symbol should come first.
 945          * Note: since the search can be a regexp, both symbols may match
 946          * exactly; if this is the case, we can't decide which comes first,
 947          * and we fallback to sorting alphabetically.
 948          */
 949         exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
 950         exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
 951         if (exact1 && !exact2)
 952                 return -1;
 953         if (!exact1 && exact2)
 954                 return 1;
 955
 956         /* As a fallback, sort symbols alphabetically */
 957         return strcmp(s1->sym->name, s2->sym->name);
 958 }
 959
 960 struct symbol **sym_re_search(const char *pattern)
 961 {
 962         struct symbol *sym, **sym_arr = NULL;
 963         struct sym_match *sym_match_arr = NULL;
 964         int i, cnt, size;
 965         regex_t re;
 966         regmatch_t match[1];
 967
 968         cnt = size = 0;
 969         /* Skip if empty */
 970         if (strlen(pattern) == 0)
 971                 return NULL;
 972         if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
 973                 return NULL;
 974
 975         for_all_symbols(i, sym) {
 976                 if (sym->flags & SYMBOL_CONST || !sym->name)
 977                         continue;
 978                 if (regexec(&re, sym->name, 1, match, 0))
 979                         continue;
 980                 if (cnt >= size) {
 981                         void *tmp;
 982                         size += 16;
 983                         tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
 984                         if (!tmp)
 985                                 goto sym_re_search_free;
 986                         sym_match_arr = tmp;
 987                 }
 988                 sym_calc_value(sym);
 989                 /* As regexec returned 0, we know we have a match, so
 990                  * we can use match[0].rm_[se]o without further checks
 991                  */
 992                 sym_match_arr[cnt].so = match[0].rm_so;
 993                 sym_match_arr[cnt].eo = match[0].rm_eo;
 994                 sym_match_arr[cnt++].sym = sym;
 995         }
 996         if (sym_match_arr) {
 997                 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
 998                 sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
 999                 if (!sym_arr)
1000                         goto sym_re_search_free;
1001                 for (i = 0; i < cnt; i++)
1002                         sym_arr[i] = sym_match_arr[i].sym;
1003                 sym_arr[cnt] = NULL;
1004         }
1005 sym_re_search_free:
1006         /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
1007         free(sym_match_arr);
1008         regfree(&re);
1009
1010         return sym_arr;
1011 }
1012
1013 /*
1014  * When we check for recursive dependencies we use a stack to save
1015  * current state so we can print out relevant info to user.
1016  * The entries are located on the call stack so no need to free memory.
1017  * Note insert() remove() must always match to properly clear the stack.
1018  */
1019 static struct dep_stack {
1020         struct dep_stack *prev, *next;
1021         struct symbol *sym;
1022         struct property *prop;
1023         struct expr *expr;
1024 } *check_top;
1025
1026 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1027 {
1028         memset(stack, 0, sizeof(*stack));
1029         if (check_top)
1030                 check_top->next = stack;
1031         stack->prev = check_top;
1032         stack->sym = sym;
1033         check_top = stack;
1034 }
1035
1036 static void dep_stack_remove(void)
1037 {
1038         check_top = check_top->prev;
1039         if (check_top)
1040                 check_top->next = NULL;
1041 }
1042
1043 /*
1044  * Called when we have detected a recursive dependency.
1045  * check_top point to the top of the stact so we use
1046  * the ->prev pointer to locate the bottom of the stack.
1047  */
1048 static void sym_check_print_recursive(struct symbol *last_sym)
1049 {
1050         struct dep_stack *stack;
1051         struct symbol *sym, *next_sym;
1052         struct menu *menu = NULL;
1053         struct property *prop;
1054         struct dep_stack cv_stack;
1055
1056         if (sym_is_choice_value(last_sym)) {
1057                 dep_stack_insert(&cv_stack, last_sym);
1058                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1059         }
1060
1061         for (stack = check_top; stack != NULL; stack = stack->prev)
1062                 if (stack->sym == last_sym)
1063                         break;
1064         if (!stack) {
1065                 fprintf(stderr, "unexpected recursive dependency error\n");
1066                 return;
1067         }
1068
1069         for (; stack; stack = stack->next) {
1070                 sym = stack->sym;
1071                 next_sym = stack->next ? stack->next->sym : last_sym;
1072                 prop = stack->prop;
1073                 if (prop == NULL)
1074                         prop = stack->sym->prop;
1075
1076                 /* for choice values find the menu entry (used below) */
1077                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1078                         for (prop = sym->prop; prop; prop = prop->next) {
1079                                 menu = prop->menu;
1080                                 if (prop->menu)
1081                                         break;
1082                         }
1083                 }
1084                 if (stack->sym == last_sym)
1085                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1086                                 prop->file->name, prop->lineno);
1087
1088                 if (stack->expr) {
1089                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1090                                 prop->file->name, prop->lineno,
1091                                 sym->name ? sym->name : "<choice>",
1092                                 prop_get_type_name(prop->type),
1093                                 next_sym->name ? next_sym->name : "<choice>");
1094                 } else if (stack->prop) {
1095                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %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 (sym_is_choice(sym)) {
1100                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1101                                 menu->file->name, menu->lineno,
1102                                 sym->name ? sym->name : "<choice>",
1103                                 next_sym->name ? next_sym->name : "<choice>");
1104                 } else if (sym_is_choice_value(sym)) {
1105                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1106                                 menu->file->name, menu->lineno,
1107                                 sym->name ? sym->name : "<choice>",
1108                                 next_sym->name ? next_sym->name : "<choice>");
1109                 } else {
1110                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1111                                 prop->file->name, prop->lineno,
1112                                 sym->name ? sym->name : "<choice>",
1113                                 next_sym->name ? next_sym->name : "<choice>");
1114                 }
1115         }
1116
1117         fprintf(stderr,
1118                 "For a resolution refer to Documentation/kbuild/kconfig-language.txt\n"
1119                 "subsection \"Kconfig recursive dependency limitations\"\n"
1120                 "\n");
1121
1122         if (check_top == &cv_stack)
1123                 dep_stack_remove();
1124 }
1125
1126 static struct symbol *sym_check_expr_deps(struct expr *e)
1127 {
1128         struct symbol *sym;
1129
1130         if (!e)
1131                 return NULL;
1132         switch (e->type) {
1133         case E_OR:
1134         case E_AND:
1135                 sym = sym_check_expr_deps(e->left.expr);
1136                 if (sym)
1137                         return sym;
1138                 return sym_check_expr_deps(e->right.expr);
1139         case E_NOT:
1140                 return sym_check_expr_deps(e->left.expr);
1141         case E_EQUAL:
1142         case E_GEQ:
1143         case E_GTH:
1144         case E_LEQ:
1145         case E_LTH:
1146         case E_UNEQUAL:
1147                 sym = sym_check_deps(e->left.sym);
1148                 if (sym)
1149                         return sym;
1150                 return sym_check_deps(e->right.sym);
1151         case E_SYMBOL:
1152                 return sym_check_deps(e->left.sym);
1153         default:
1154                 break;
1155         }
1156         fprintf(stderr, "Oops! How to check %d?\n", e->type);
1157         return NULL;
1158 }
1159
1160 /* return NULL when dependencies are OK */
1161 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1162 {
1163         struct symbol *sym2;
1164         struct property *prop;
1165         struct dep_stack stack;
1166
1167         dep_stack_insert(&stack, sym);
1168
1169         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1170         if (sym2)
1171                 goto out;
1172
1173         for (prop = sym->prop; prop; prop = prop->next) {
1174                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1175                         continue;
1176                 stack.prop = prop;
1177                 sym2 = sym_check_expr_deps(prop->visible.expr);
1178                 if (sym2)
1179                         break;
1180                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1181                         continue;
1182                 stack.expr = prop->expr;
1183                 sym2 = sym_check_expr_deps(prop->expr);
1184                 if (sym2)
1185                         break;
1186                 stack.expr = NULL;
1187         }
1188
1189 out:
1190         dep_stack_remove();
1191
1192         return sym2;
1193 }
1194
1195 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1196 {
1197         struct symbol *sym, *sym2;
1198         struct property *prop;
1199         struct expr *e;
1200         struct dep_stack stack;
1201
1202         dep_stack_insert(&stack, choice);
1203
1204         prop = sym_get_choice_prop(choice);
1205         expr_list_for_each_sym(prop->expr, e, sym)
1206                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1207
1208         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1209         sym2 = sym_check_sym_deps(choice);
1210         choice->flags &= ~SYMBOL_CHECK;
1211         if (sym2)
1212                 goto out;
1213
1214         expr_list_for_each_sym(prop->expr, e, sym) {
1215                 sym2 = sym_check_sym_deps(sym);
1216                 if (sym2)
1217                         break;
1218         }
1219 out:
1220         expr_list_for_each_sym(prop->expr, e, sym)
1221                 sym->flags &= ~SYMBOL_CHECK;
1222
1223         if (sym2 && sym_is_choice_value(sym2) &&
1224             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1225                 sym2 = choice;
1226
1227         dep_stack_remove();
1228
1229         return sym2;
1230 }
1231
1232 struct symbol *sym_check_deps(struct symbol *sym)
1233 {
1234         struct symbol *sym2;
1235         struct property *prop;
1236
1237         if (sym->flags & SYMBOL_CHECK) {
1238                 sym_check_print_recursive(sym);
1239                 return sym;
1240         }
1241         if (sym->flags & SYMBOL_CHECKED)
1242                 return NULL;
1243
1244         if (sym_is_choice_value(sym)) {
1245                 struct dep_stack stack;
1246
1247                 /* for choice groups start the check with main choice symbol */
1248                 dep_stack_insert(&stack, sym);
1249                 prop = sym_get_choice_prop(sym);
1250                 sym2 = sym_check_deps(prop_get_symbol(prop));
1251                 dep_stack_remove();
1252         } else if (sym_is_choice(sym)) {
1253                 sym2 = sym_check_choice_deps(sym);
1254         } else {
1255                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1256                 sym2 = sym_check_sym_deps(sym);
1257                 sym->flags &= ~SYMBOL_CHECK;
1258         }
1259
1260         if (sym2 && sym2 == sym)
1261                 sym2 = NULL;
1262
1263         return sym2;
1264 }
1265
1266 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1267 {
1268         struct property *prop;
1269         struct property **propp;
1270
1271         prop = xmalloc(sizeof(*prop));
1272         memset(prop, 0, sizeof(*prop));
1273         prop->type = type;
1274         prop->sym = sym;
1275         prop->file = current_file;
1276         prop->lineno = zconf_lineno();
1277
1278         /* append property to the prop list of symbol */
1279         if (sym) {
1280                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1281                         ;
1282                 *propp = prop;
1283         }
1284
1285         return prop;
1286 }
1287
1288 struct symbol *prop_get_symbol(struct property *prop)
1289 {
1290         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1291                            prop->expr->type == E_LIST))
1292                 return prop->expr->left.sym;
1293         return NULL;
1294 }
1295
1296 const char *prop_get_type_name(enum prop_type type)
1297 {
1298         switch (type) {
1299         case P_PROMPT:
1300                 return "prompt";
1301         case P_ENV:
1302                 return "env";
1303         case P_COMMENT:
1304                 return "comment";
1305         case P_MENU:
1306                 return "menu";
1307         case P_DEFAULT:
1308                 return "default";
1309         case P_CHOICE:
1310                 return "choice";
1311         case P_SELECT:
1312                 return "select";
1313         case P_IMPLY:
1314                 return "imply";
1315         case P_RANGE:
1316                 return "range";
1317         case P_SYMBOL:
1318                 return "symbol";
1319         case P_UNKNOWN:
1320                 break;
1321         }
1322         return "unknown";
1323 }