config/symbol.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <ctype.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <regex.h>
  10 #include <sys/utsname.h>
  11
  12 #include "lkc.h"
  13
  14 struct symbol symbol_yes = {
  15         .name = "y",
  16         .curr = { "y", yes },
  17         .flags = SYMBOL_CONST|SYMBOL_VALID,
  18 }, symbol_mod = {
  19         .name = "m",
  20         .curr = { "m", mod },
  21         .flags = SYMBOL_CONST|SYMBOL_VALID,
  22 }, symbol_no = {
  23         .name = "n",
  24         .curr = { "n", no },
  25         .flags = SYMBOL_CONST|SYMBOL_VALID,
  26 }, symbol_empty = {
  27         .name = "",
  28         .curr = { "", no },
  29         .flags = SYMBOL_VALID,
  30 };
  31
  32 struct symbol *sym_defconfig_list;
  33 struct symbol *modules_sym;
  34 tristate modules_val;
  35
  36 struct expr *sym_env_list;
  37
  38 static void sym_add_default(struct symbol *sym, const char *def)
  39 {
  40         struct property *prop = prop_alloc(P_DEFAULT, sym);
  41
  42         prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));
  43 }
  44
  45 void sym_init(void)
  46 {
  47         struct symbol *sym;
  48         struct utsname uts;
  49         static bool inited = false;
  50
  51         if (inited)
  52                 return;
  53         inited = true;
  54
  55         uname(&uts);
  56
  57         sym = sym_lookup("UNAME_RELEASE", 0);
  58         sym->type = S_STRING;
  59         sym->flags |= SYMBOL_AUTO;
  60         sym_add_default(sym, uts.release);
  61 }
  62
  63 enum symbol_type sym_get_type(struct symbol *sym)
  64 {
  65         enum symbol_type type = sym->type;
  66
  67         if (type == S_TRISTATE) {
  68                 if (sym_is_choice_value(sym) && sym->visible == yes)
  69                         type = S_BOOLEAN;
  70                 else if (modules_val == no)
  71                         type = S_BOOLEAN;
  72         }
  73         return type;
  74 }
  75
  76 const char *sym_type_name(enum symbol_type type)
  77 {
  78         switch (type) {
  79         case S_BOOLEAN:
  80                 return "bool";
  81         case S_TRISTATE:
  82                 return "tristate";
  83         case S_INT:
  84                 return "integer";
  85         case S_HEX:
  86                 return "hex";
  87         case S_STRING:
  88                 return "string";
  89         case S_UNKNOWN:
  90                 return "unknown";
  91         case S_OTHER:
  92                 break;
  93         }
  94         return "???";
  95 }
  96
  97 struct property *sym_get_choice_prop(struct symbol *sym)
  98 {
  99         struct property *prop;
 100
 101         for_all_choices(sym, prop)
 102                 return prop;
 103         return NULL;
 104 }
 105
 106 struct property *sym_get_env_prop(struct symbol *sym)
 107 {
 108         struct property *prop;
 109
 110         for_all_properties(sym, prop, P_ENV)
 111                 return prop;
 112         return NULL;
 113 }
 114
 115 static struct property *sym_get_default_prop(struct symbol *sym)
 116 {
 117         struct property *prop;
 118
 119         for_all_defaults(sym, prop) {
 120                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 121                 if (prop->visible.tri != no)
 122                         return prop;
 123         }
 124         return NULL;
 125 }
 126
 127 static struct property *sym_get_range_prop(struct symbol *sym)
 128 {
 129         struct property *prop;
 130
 131         for_all_properties(sym, prop, P_RANGE) {
 132                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 133                 if (prop->visible.tri != no)
 134                         return prop;
 135         }
 136         return NULL;
 137 }
 138
 139 static long long sym_get_range_val(struct symbol *sym, int base)
 140 {
 141         sym_calc_value(sym);
 142         switch (sym->type) {
 143         case S_INT:
 144                 base = 10;
 145                 break;
 146         case S_HEX:
 147                 base = 16;
 148                 break;
 149         default:
 150                 break;
 151         }
 152         return strtoll(sym->curr.val, NULL, base);
 153 }
 154
 155 static void sym_validate_range(struct symbol *sym)
 156 {
 157         struct property *prop;
 158         int base;
 159         long long val, val2;
 160         char str[64];
 161
 162         switch (sym->type) {
 163         case S_INT:
 164                 base = 10;
 165                 break;
 166         case S_HEX:
 167                 base = 16;
 168                 break;
 169         default:
 170                 return;
 171         }
 172         prop = sym_get_range_prop(sym);
 173         if (!prop)
 174                 return;
 175         val = strtoll(sym->curr.val, NULL, base);
 176         val2 = sym_get_range_val(prop->expr->left.sym, base);
 177         if (val >= val2) {
 178                 val2 = sym_get_range_val(prop->expr->right.sym, base);
 179                 if (val <= val2)
 180                         return;
 181         }
 182         if (sym->type == S_INT)
 183                 sprintf(str, "%lld", val2);
 184         else
 185                 sprintf(str, "0x%llx", val2);
 186         sym->curr.val = xstrdup(str);
 187 }
 188
 189 static void sym_set_changed(struct symbol *sym)
 190 {
 191         struct property *prop;
 192
 193         sym->flags |= SYMBOL_CHANGED;
 194         for (prop = sym->prop; prop; prop = prop->next) {
 195                 if (prop->menu)
 196                         prop->menu->flags |= MENU_CHANGED;
 197         }
 198 }
 199
 200 static void sym_set_all_changed(void)
 201 {
 202         struct symbol *sym;
 203         int i;
 204
 205         for_all_symbols(i, sym)
 206                 sym_set_changed(sym);
 207 }
 208
 209 static void sym_calc_visibility(struct symbol *sym)
 210 {
 211         struct property *prop;
 212         struct symbol *choice_sym = NULL;
 213         tristate tri;
 214
 215         /* any prompt visible? */
 216         tri = no;
 217
 218         if (sym_is_choice_value(sym))
 219                 choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
 220
 221         for_all_prompts(sym, prop) {
 222                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 223                 /*
 224                  * Tristate choice_values with visibility 'mod' are
 225                  * not visible if the corresponding choice's value is
 226                  * 'yes'.
 227                  */
 228                 if (choice_sym && sym->type == S_TRISTATE &&
 229                     prop->visible.tri == mod && choice_sym->curr.tri == yes)
 230                         prop->visible.tri = no;
 231
 232                 tri = EXPR_OR(tri, prop->visible.tri);
 233         }
 234         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 235                 tri = yes;
 236         if (sym->visible != tri) {
 237                 sym->visible = tri;
 238                 sym_set_changed(sym);
 239         }
 240         if (sym_is_choice_value(sym))
 241                 return;
 242         /* defaulting to "yes" if no explicit "depends on" are given */
 243         tri = yes;
 244         if (sym->dir_dep.expr)
 245                 tri = expr_calc_value(sym->dir_dep.expr);
 246         if (tri == mod)
 247                 tri = yes;
 248         if (sym->dir_dep.tri != tri) {
 249                 sym->dir_dep.tri = tri;
 250                 sym_set_changed(sym);
 251         }
 252         tri = no;
 253         if (sym->rev_dep.expr)
 254                 tri = expr_calc_value(sym->rev_dep.expr);
 255         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 256                 tri = yes;
 257         if (sym->rev_dep.tri != tri) {
 258                 sym->rev_dep.tri = tri;
 259                 sym_set_changed(sym);
 260         }
 261         tri = no;
 262         if (sym->implied.expr && sym->dir_dep.tri != no)
 263                 tri = expr_calc_value(sym->implied.expr);
 264         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 265                 tri = yes;
 266         if (sym->implied.tri != tri) {
 267                 sym->implied.tri = tri;
 268                 sym_set_changed(sym);
 269         }
 270 }
 271
 272 /*
 273  * Find the default symbol for a choice.
 274  * First try the default values for the choice symbol
 275  * Next locate the first visible choice value
 276  * Return NULL if none was found
 277  */
 278 struct symbol *sym_choice_default(struct symbol *sym)
 279 {
 280         struct symbol *def_sym;
 281         struct property *prop;
 282         struct expr *e;
 283
 284         /* any of the defaults visible? */
 285         for_all_defaults(sym, prop) {
 286                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 287                 if (prop->visible.tri == no)
 288                         continue;
 289                 def_sym = prop_get_symbol(prop);
 290                 if (def_sym->visible != no)
 291                         return def_sym;
 292         }
 293
 294         /* just get the first visible value */
 295         prop = sym_get_choice_prop(sym);
 296         expr_list_for_each_sym(prop->expr, e, def_sym)
 297                 if (def_sym->visible != no)
 298                         return def_sym;
 299
 300         /* failed to locate any defaults */
 301         return NULL;
 302 }
 303
 304 static struct symbol *sym_calc_choice(struct symbol *sym)
 305 {
 306         struct symbol *def_sym;
 307         struct property *prop;
 308         struct expr *e;
 309         int flags;
 310
 311         /* first calculate all choice values' visibilities */
 312         flags = sym->flags;
 313         prop = sym_get_choice_prop(sym);
 314         expr_list_for_each_sym(prop->expr, e, def_sym) {
 315                 sym_calc_visibility(def_sym);
 316                 if (def_sym->visible != no)
 317                         flags &= def_sym->flags;
 318         }
 319
 320         sym->flags &= flags | ~SYMBOL_DEF_USER;
 321
 322         /* is the user choice visible? */
 323         def_sym = sym->def[S_DEF_USER].val;
 324         if (def_sym && def_sym->visible != no)
 325                 return def_sym;
 326
 327         def_sym = sym_choice_default(sym);
 328
 329         if (def_sym == NULL)
 330                 /* no choice? reset tristate value */
 331                 sym->curr.tri = no;
 332
 333         return def_sym;
 334 }
 335
 336 void sym_calc_value(struct symbol *sym)
 337 {
 338         struct symbol_value newval, oldval;
 339         struct property *prop;
 340         struct expr *e;
 341
 342         if (!sym)
 343                 return;
 344
 345         if (sym->flags & SYMBOL_VALID)
 346                 return;
 347
 348         if (sym_is_choice_value(sym) &&
 349             sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
 350                 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
 351                 prop = sym_get_choice_prop(sym);
 352                 sym_calc_value(prop_get_symbol(prop));
 353         }
 354
 355         sym->flags |= SYMBOL_VALID;
 356
 357         oldval = sym->curr;
 358
 359         switch (sym->type) {
 360         case S_INT:
 361         case S_HEX:
 362         case S_STRING:
 363                 newval = symbol_empty.curr;
 364                 break;
 365         case S_BOOLEAN:
 366         case S_TRISTATE:
 367                 newval = symbol_no.curr;
 368                 break;
 369         default:
 370                 sym->curr.val = sym->name;
 371                 sym->curr.tri = no;
 372                 return;
 373         }
 374         sym->flags &= ~SYMBOL_WRITE;
 375
 376         sym_calc_visibility(sym);
 377
 378         if (sym->visible != no)
 379                 sym->flags |= SYMBOL_WRITE;
 380
 381         /* set default if recursively called */
 382         sym->curr = newval;
 383
 384         switch (sym_get_type(sym)) {
 385         case S_BOOLEAN:
 386         case S_TRISTATE:
 387                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 388                         prop = sym_get_choice_prop(sym);
 389                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 390                 } else {
 391                         if (sym->visible != no) {
 392                                 /* if the symbol is visible use the user value
 393                                  * if available, otherwise try the default value
 394                                  */
 395                                 if (sym_has_value(sym)) {
 396                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 397                                                               sym->visible);
 398                                         goto calc_newval;
 399                                 }
 400                         }
 401                         if (sym->rev_dep.tri != no)
 402                                 sym->flags |= SYMBOL_WRITE;
 403                         if (!sym_is_choice(sym)) {
 404                                 prop = sym_get_default_prop(sym);
 405                                 if (prop) {
 406                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 407                                                               prop->visible.tri);
 408                                         if (newval.tri != no)
 409                                                 sym->flags |= SYMBOL_WRITE;
 410                                 }
 411                                 if (sym->implied.tri != no) {
 412                                         sym->flags |= SYMBOL_WRITE;
 413                                         newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
 414                                 }
 415                         }
 416                 calc_newval:
 417                         if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
 418                                 struct expr *e;
 419                                 e = expr_simplify_unmet_dep(sym->rev_dep.expr,
 420                                     sym->dir_dep.expr);
 421                                 fprintf(stderr, "warning: (");
 422                                 expr_fprint(e, stderr);
 423                                 fprintf(stderr, ") selects %s which has unmet direct dependencies (",
 424                                         sym->name);
 425                                 expr_fprint(sym->dir_dep.expr, stderr);
 426                                 fprintf(stderr, ")\n");
 427                                 expr_free(e);
 428                         }
 429                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 430                 }
 431                 if (newval.tri == mod &&
 432                     (sym_get_type(sym) == S_BOOLEAN || sym->implied.tri == yes))
 433                         newval.tri = yes;
 434                 break;
 435         case S_STRING:
 436         case S_HEX:
 437         case S_INT:
 438                 if (sym->visible != no && sym_has_value(sym)) {
 439                         newval.val = sym->def[S_DEF_USER].val;
 440                         break;
 441                 }
 442                 prop = sym_get_default_prop(sym);
 443                 if (prop) {
 444                         struct symbol *ds = prop_get_symbol(prop);
 445                         if (ds) {
 446                                 sym->flags |= SYMBOL_WRITE;
 447                                 sym_calc_value(ds);
 448                                 newval.val = ds->curr.val;
 449                         }
 450                 }
 451                 break;
 452         default:
 453                 ;
 454         }
 455
 456         sym->curr = newval;
 457         if (sym_is_choice(sym) && newval.tri == yes)
 458                 sym->curr.val = sym_calc_choice(sym);
 459         sym_validate_range(sym);
 460
 461         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 462                 sym_set_changed(sym);
 463                 if (modules_sym == sym) {
 464                         sym_set_all_changed();
 465                         modules_val = modules_sym->curr.tri;
 466                 }
 467         }
 468
 469         if (sym_is_choice(sym)) {
 470                 struct symbol *choice_sym;
 471
 472                 prop = sym_get_choice_prop(sym);
 473                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 474                         if ((sym->flags & SYMBOL_WRITE) &&
 475                             choice_sym->visible != no)
 476                                 choice_sym->flags |= SYMBOL_WRITE;
 477                         if (sym->flags & SYMBOL_CHANGED)
 478                                 sym_set_changed(choice_sym);
 479                 }
 480         }
 481
 482         if (sym->flags & SYMBOL_AUTO)
 483                 sym->flags &= ~SYMBOL_WRITE;
 484
 485         if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
 486                 set_all_choice_values(sym);
 487 }
 488
 489 void sym_clear_all_valid(void)
 490 {
 491         struct symbol *sym;
 492         int i;
 493
 494         for_all_symbols(i, sym)
 495                 sym->flags &= ~SYMBOL_VALID;
 496         sym_add_change_count(1);
 497         sym_calc_value(modules_sym);
 498 }
 499
 500 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 501 {
 502         int type = sym_get_type(sym);
 503
 504         if (sym->visible == no)
 505                 return false;
 506
 507         if (type != S_BOOLEAN && type != S_TRISTATE)
 508                 return false;
 509
 510         if (type == S_BOOLEAN && val == mod)
 511                 return false;
 512         if (sym->visible <= sym->rev_dep.tri)
 513                 return false;
 514         if (sym->implied.tri == yes && val == mod)
 515                 return false;
 516         if (sym_is_choice_value(sym) && sym->visible == yes)
 517                 return val == yes;
 518         return val >= sym->rev_dep.tri && val <= sym->visible;
 519 }
 520
 521 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 522 {
 523         tristate oldval = sym_get_tristate_value(sym);
 524
 525         if (oldval != val && !sym_tristate_within_range(sym, val))
 526                 return false;
 527
 528         if (!(sym->flags & SYMBOL_DEF_USER)) {
 529                 sym->flags |= SYMBOL_DEF_USER;
 530                 sym_set_changed(sym);
 531         }
 532         /*
 533          * setting a choice value also resets the new flag of the choice
 534          * symbol and all other choice values.
 535          */
 536         if (sym_is_choice_value(sym) && val == yes) {
 537                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 538                 struct property *prop;
 539                 struct expr *e;
 540
 541                 cs->def[S_DEF_USER].val = sym;
 542                 cs->flags |= SYMBOL_DEF_USER;
 543                 prop = sym_get_choice_prop(cs);
 544                 for (e = prop->expr; e; e = e->left.expr) {
 545                         if (e->right.sym->visible != no)
 546                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 547                 }
 548         }
 549
 550         sym->def[S_DEF_USER].tri = val;
 551         if (oldval != val)
 552                 sym_clear_all_valid();
 553
 554         return true;
 555 }
 556
 557 tristate sym_toggle_tristate_value(struct symbol *sym)
 558 {
 559         tristate oldval, newval;
 560
 561         oldval = newval = sym_get_tristate_value(sym);
 562         do {
 563                 switch (newval) {
 564                 case no:
 565                         newval = mod;
 566                         break;
 567                 case mod:
 568                         newval = yes;
 569                         break;
 570                 case yes:
 571                         newval = no;
 572                         break;
 573                 }
 574                 if (sym_set_tristate_value(sym, newval))
 575                         break;
 576         } while (oldval != newval);
 577         return newval;
 578 }
 579
 580 bool sym_string_valid(struct symbol *sym, const char *str)
 581 {
 582         signed char ch;
 583
 584         switch (sym->type) {
 585         case S_STRING:
 586                 return true;
 587         case S_INT:
 588                 ch = *str++;
 589                 if (ch == '-')
 590                         ch = *str++;
 591                 if (!isdigit(ch))
 592                         return false;
 593                 if (ch == '0' && *str != 0)
 594                         return false;
 595                 while ((ch = *str++)) {
 596                         if (!isdigit(ch))
 597                                 return false;
 598                 }
 599                 return true;
 600         case S_HEX:
 601                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 602                         str += 2;
 603                 ch = *str++;
 604                 do {
 605                         if (!isxdigit(ch))
 606                                 return false;
 607                 } while ((ch = *str++));
 608                 return true;
 609         case S_BOOLEAN:
 610         case S_TRISTATE:
 611                 switch (str[0]) {
 612                 case 'y': case 'Y':
 613                 case 'm': case 'M':
 614                 case 'n': case 'N':
 615                         return true;
 616                 }
 617                 return false;
 618         default:
 619                 return false;
 620         }
 621 }
 622
 623 bool sym_string_within_range(struct symbol *sym, const char *str)
 624 {
 625         struct property *prop;
 626         long long val;
 627
 628         switch (sym->type) {
 629         case S_STRING:
 630                 return sym_string_valid(sym, str);
 631         case S_INT:
 632                 if (!sym_string_valid(sym, str))
 633                         return false;
 634                 prop = sym_get_range_prop(sym);
 635                 if (!prop)
 636                         return true;
 637                 val = strtoll(str, NULL, 10);
 638                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 639                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 640         case S_HEX:
 641                 if (!sym_string_valid(sym, str))
 642                         return false;
 643                 prop = sym_get_range_prop(sym);
 644                 if (!prop)
 645                         return true;
 646                 val = strtoll(str, NULL, 16);
 647                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 648                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 649         case S_BOOLEAN:
 650         case S_TRISTATE:
 651                 switch (str[0]) {
 652                 case 'y': case 'Y':
 653                         return sym_tristate_within_range(sym, yes);
 654                 case 'm': case 'M':
 655                         return sym_tristate_within_range(sym, mod);
 656                 case 'n': case 'N':
 657                         return sym_tristate_within_range(sym, no);
 658                 }
 659                 return false;
 660         default:
 661                 return false;
 662         }
 663 }
 664
 665 bool sym_set_string_value(struct symbol *sym, const char *newval)
 666 {
 667         const char *oldval;
 668         char *val;
 669         int size;
 670
 671         switch (sym->type) {
 672         case S_BOOLEAN:
 673         case S_TRISTATE:
 674                 switch (newval[0]) {
 675                 case 'y': case 'Y':
 676                         return sym_set_tristate_value(sym, yes);
 677                 case 'm': case 'M':
 678                         return sym_set_tristate_value(sym, mod);
 679                 case 'n': case 'N':
 680                         return sym_set_tristate_value(sym, no);
 681                 }
 682                 return false;
 683         default:
 684                 ;
 685         }
 686
 687         if (!sym_string_within_range(sym, newval))
 688                 return false;
 689
 690         if (!(sym->flags & SYMBOL_DEF_USER)) {
 691                 sym->flags |= SYMBOL_DEF_USER;
 692                 sym_set_changed(sym);
 693         }
 694
 695         oldval = sym->def[S_DEF_USER].val;
 696         size = strlen(newval) + 1;
 697         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 698                 size += 2;
 699                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 700                 *val++ = '0';
 701                 *val++ = 'x';
 702         } else if (!oldval || strcmp(oldval, newval))
 703                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 704         else
 705                 return true;
 706
 707         strcpy(val, newval);
 708         free((void *)oldval);
 709         sym_clear_all_valid();
 710
 711         return true;
 712 }
 713
 714 /*
 715  * Find the default value associated to a symbol.
 716  * For tristate symbol handle the modules=n case
 717  * in which case "m" becomes "y".
 718  * If the symbol does not have any default then fallback
 719  * to the fixed default values.
 720  */
 721 const char *sym_get_string_default(struct symbol *sym)
 722 {
 723         struct property *prop;
 724         struct symbol *ds;
 725         const char *str;
 726         tristate val;
 727
 728         sym_calc_visibility(sym);
 729         sym_calc_value(modules_sym);
 730         val = symbol_no.curr.tri;
 731         str = symbol_empty.curr.val;
 732
 733         /* If symbol has a default value look it up */
 734         prop = sym_get_default_prop(sym);
 735         if (prop != NULL) {
 736                 switch (sym->type) {
 737                 case S_BOOLEAN:
 738                 case S_TRISTATE:
 739                         /* The visibility may limit the value from yes => mod */
 740                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 741                         break;
 742                 default:
 743                         /*
 744                          * The following fails to handle the situation
 745                          * where a default value is further limited by
 746                          * the valid range.
 747                          */
 748                         ds = prop_get_symbol(prop);
 749                         if (ds != NULL) {
 750                                 sym_calc_value(ds);
 751                                 str = (const char *)ds->curr.val;
 752                         }
 753                 }
 754         }
 755
 756         /* Handle select statements */
 757         val = EXPR_OR(val, sym->rev_dep.tri);
 758
 759         /* transpose mod to yes if modules are not enabled */
 760         if (val == mod)
 761                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 762                         val = yes;
 763
 764         /* transpose mod to yes if type is bool */
 765         if (sym->type == S_BOOLEAN && val == mod)
 766                 val = yes;
 767
 768         /* adjust the default value if this symbol is implied by another */
 769         if (val < sym->implied.tri)
 770                 val = sym->implied.tri;
 771
 772         switch (sym->type) {
 773         case S_BOOLEAN:
 774         case S_TRISTATE:
 775                 switch (val) {
 776                 case no: return "n";
 777                 case mod: return "m";
 778                 case yes: return "y";
 779                 }
 780         case S_INT:
 781         case S_HEX:
 782                 return str;
 783         case S_STRING:
 784                 return str;
 785         case S_OTHER:
 786         case S_UNKNOWN:
 787                 break;
 788         }
 789         return "";
 790 }
 791
 792 const char *sym_get_string_value(struct symbol *sym)
 793 {
 794         tristate val;
 795
 796         switch (sym->type) {
 797         case S_BOOLEAN:
 798         case S_TRISTATE:
 799                 val = sym_get_tristate_value(sym);
 800                 switch (val) {
 801                 case no:
 802                         return "n";
 803                 case mod:
 804                         sym_calc_value(modules_sym);
 805                         return (modules_sym->curr.tri == no) ? "n" : "m";
 806                 case yes:
 807                         return "y";
 808                 }
 809                 break;
 810         default:
 811                 ;
 812         }
 813         return (const char *)sym->curr.val;
 814 }
 815
 816 bool sym_is_changable(struct symbol *sym)
 817 {
 818         return sym->visible > sym->rev_dep.tri;
 819 }
 820
 821 static unsigned strhash(const char *s)
 822 {
 823         /* fnv32 hash */
 824         unsigned hash = 2166136261U;
 825         for (; *s; s++)
 826                 hash = (hash ^ *s) * 0x01000193;
 827         return hash;
 828 }
 829
 830 struct symbol *sym_lookup(const char *name, int flags)
 831 {
 832         struct symbol *symbol;
 833         char *new_name;
 834         int hash;
 835
 836         if (name) {
 837                 if (name[0] && !name[1]) {
 838                         switch (name[0]) {
 839                         case 'y': return &symbol_yes;
 840                         case 'm': return &symbol_mod;
 841                         case 'n': return &symbol_no;
 842                         }
 843                 }
 844                 hash = strhash(name) % SYMBOL_HASHSIZE;
 845
 846                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 847                         if (symbol->name &&
 848                             !strcmp(symbol->name, name) &&
 849                             (flags ? symbol->flags & flags
 850                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 851                                 return symbol;
 852                 }
 853                 new_name = xstrdup(name);
 854         } else {
 855                 new_name = NULL;
 856                 hash = 0;
 857         }
 858
 859         symbol = xmalloc(sizeof(*symbol));
 860         memset(symbol, 0, sizeof(*symbol));
 861         symbol->name = new_name;
 862         symbol->type = S_UNKNOWN;
 863         symbol->flags |= flags;
 864
 865         symbol->next = symbol_hash[hash];
 866         symbol_hash[hash] = symbol;
 867
 868         return symbol;
 869 }
 870
 871 struct symbol *sym_find(const char *name)
 872 {
 873         struct symbol *symbol = NULL;
 874         int hash = 0;
 875
 876         if (!name)
 877                 return NULL;
 878
 879         if (name[0] && !name[1]) {
 880                 switch (name[0]) {
 881                 case 'y': return &symbol_yes;
 882                 case 'm': return &symbol_mod;
 883                 case 'n': return &symbol_no;
 884                 }
 885         }
 886         hash = strhash(name) % SYMBOL_HASHSIZE;
 887
 888         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 889                 if (symbol->name &&
 890                     !strcmp(symbol->name, name) &&
 891                     !(symbol->flags & SYMBOL_CONST))
 892                                 break;
 893         }
 894
 895         return symbol;
 896 }
 897
 898 /*
 899  * Expand symbol's names embedded in the string given in argument. Symbols'
 900  * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
 901  * the empty string.
 902  */
 903 char *sym_expand_string_value(const char *in)
 904 {
 905         const char *src;
 906         char *res;
 907         size_t reslen;
 908
 909         /*
 910          * Note: 'in' might come from a token that's about to be
 911          * freed, so make sure to always allocate a new string
 912          */
 913         reslen = strlen(in) + 1;
 914         res = xmalloc(reslen);
 915         res[0] = '\0';
 916
 917         while ((src = strchr(in, '$'))) {
 918                 char *p, name[SYMBOL_MAXLENGTH];
 919                 const char *symval = "";
 920                 struct symbol *sym;
 921                 size_t newlen;
 922
 923                 strncat(res, in, src - in);
 924                 src++;
 925
 926                 p = name;
 927                 while (isalnum(*src) || *src == '_')
 928                         *p++ = *src++;
 929                 *p = '\0';
 930
 931                 sym = sym_find(name);
 932                 if (sym != NULL) {
 933                         sym_calc_value(sym);
 934                         symval = sym_get_string_value(sym);
 935                 }
 936
 937                 newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
 938                 if (newlen > reslen) {
 939                         reslen = newlen;
 940                         res = xrealloc(res, reslen);
 941                 }
 942
 943                 strcat(res, symval);
 944                 in = src;
 945         }
 946         strcat(res, in);
 947
 948         return res;
 949 }
 950
 951 const char *sym_escape_string_value(const char *in)
 952 {
 953         const char *p;
 954         size_t reslen;
 955         char *res;
 956         size_t l;
 957
 958         reslen = strlen(in) + strlen("\"\"") + 1;
 959
 960         p = in;
 961         for (;;) {
 962                 l = strcspn(p, "\"\\");
 963                 p += l;
 964
 965                 if (p[0] == '\0')
 966                         break;
 967
 968                 reslen++;
 969                 p++;
 970         }
 971
 972         res = xmalloc(reslen);
 973         res[0] = '\0';
 974
 975         strcat(res, "\"");
 976
 977         p = in;
 978         for (;;) {
 979                 l = strcspn(p, "\"\\");
 980                 strncat(res, p, l);
 981                 p += l;
 982
 983                 if (p[0] == '\0')
 984                         break;
 985
 986                 strcat(res, "\\");
 987                 strncat(res, p++, 1);
 988         }
 989
 990         strcat(res, "\"");
 991         return res;
 992 }
 993
 994 struct sym_match {
 995         struct symbol   *sym;
 996         off_t           so, eo;
 997 };
 998
 999 /* Compare matched symbols as thus:
1000  * - first, symbols that match exactly
1001  * - then, alphabetical sort
1002  */
1003 static int sym_rel_comp(const void *sym1, const void *sym2)
1004 {
1005         const struct sym_match *s1 = sym1;
1006         const struct sym_match *s2 = sym2;
1007         int exact1, exact2;
1008
1009         /* Exact match:
1010          * - if matched length on symbol s1 is the length of that symbol,
1011          *   then this symbol should come first;
1012          * - if matched length on symbol s2 is the length of that symbol,
1013          *   then this symbol should come first.
1014          * Note: since the search can be a regexp, both symbols may match
1015          * exactly; if this is the case, we can't decide which comes first,
1016          * and we fallback to sorting alphabetically.
1017          */
1018         exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
1019         exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
1020         if (exact1 && !exact2)
1021                 return -1;
1022         if (!exact1 && exact2)
1023                 return 1;
1024
1025         /* As a fallback, sort symbols alphabetically */
1026         return strcmp(s1->sym->name, s2->sym->name);
1027 }
1028
1029 struct symbol **sym_re_search(const char *pattern)
1030 {
1031         struct symbol *sym, **sym_arr = NULL;
1032         struct sym_match *sym_match_arr = NULL;
1033         int i, cnt, size;
1034         regex_t re;
1035         regmatch_t match[1];
1036
1037         cnt = size = 0;
1038         /* Skip if empty */
1039         if (strlen(pattern) == 0)
1040                 return NULL;
1041         if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
1042                 return NULL;
1043
1044         for_all_symbols(i, sym) {
1045                 if (sym->flags & SYMBOL_CONST || !sym->name)
1046                         continue;
1047                 if (regexec(&re, sym->name, 1, match, 0))
1048                         continue;
1049                 if (cnt >= size) {
1050                         void *tmp;
1051                         size += 16;
1052                         tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
1053                         if (!tmp)
1054                                 goto sym_re_search_free;
1055                         sym_match_arr = tmp;
1056                 }
1057                 sym_calc_value(sym);
1058                 /* As regexec returned 0, we know we have a match, so
1059                  * we can use match[0].rm_[se]o without further checks
1060                  */
1061                 sym_match_arr[cnt].so = match[0].rm_so;
1062                 sym_match_arr[cnt].eo = match[0].rm_eo;
1063                 sym_match_arr[cnt++].sym = sym;
1064         }
1065         if (sym_match_arr) {
1066                 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
1067                 sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
1068                 if (!sym_arr)
1069                         goto sym_re_search_free;
1070                 for (i = 0; i < cnt; i++)
1071                         sym_arr[i] = sym_match_arr[i].sym;
1072                 sym_arr[cnt] = NULL;
1073         }
1074 sym_re_search_free:
1075         /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
1076         free(sym_match_arr);
1077         regfree(&re);
1078
1079         return sym_arr;
1080 }
1081
1082 /*
1083  * When we check for recursive dependencies we use a stack to save
1084  * current state so we can print out relevant info to user.
1085  * The entries are located on the call stack so no need to free memory.
1086  * Note insert() remove() must always match to properly clear the stack.
1087  */
1088 static struct dep_stack {
1089         struct dep_stack *prev, *next;
1090         struct symbol *sym;
1091         struct property *prop;
1092         struct expr *expr;
1093 } *check_top;
1094
1095 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1096 {
1097         memset(stack, 0, sizeof(*stack));
1098         if (check_top)
1099                 check_top->next = stack;
1100         stack->prev = check_top;
1101         stack->sym = sym;
1102         check_top = stack;
1103 }
1104
1105 static void dep_stack_remove(void)
1106 {
1107         check_top = check_top->prev;
1108         if (check_top)
1109                 check_top->next = NULL;
1110 }
1111
1112 /*
1113  * Called when we have detected a recursive dependency.
1114  * check_top point to the top of the stact so we use
1115  * the ->prev pointer to locate the bottom of the stack.
1116  */
1117 static void sym_check_print_recursive(struct symbol *last_sym)
1118 {
1119         struct dep_stack *stack;
1120         struct symbol *sym, *next_sym;
1121         struct menu *menu = NULL;
1122         struct property *prop;
1123         struct dep_stack cv_stack;
1124
1125         if (sym_is_choice_value(last_sym)) {
1126                 dep_stack_insert(&cv_stack, last_sym);
1127                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1128         }
1129
1130         for (stack = check_top; stack != NULL; stack = stack->prev)
1131                 if (stack->sym == last_sym)
1132                         break;
1133         if (!stack) {
1134                 fprintf(stderr, "unexpected recursive dependency error\n");
1135                 return;
1136         }
1137
1138         for (; stack; stack = stack->next) {
1139                 sym = stack->sym;
1140                 next_sym = stack->next ? stack->next->sym : last_sym;
1141                 prop = stack->prop;
1142                 if (prop == NULL)
1143                         prop = stack->sym->prop;
1144
1145                 /* for choice values find the menu entry (used below) */
1146                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1147                         for (prop = sym->prop; prop; prop = prop->next) {
1148                                 menu = prop->menu;
1149                                 if (prop->menu)
1150                                         break;
1151                         }
1152                 }
1153                 if (stack->sym == last_sym)
1154                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1155                                 prop->file->name, prop->lineno);
1156
1157                 if (stack->expr) {
1158                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1159                                 prop->file->name, prop->lineno,
1160                                 sym->name ? sym->name : "<choice>",
1161                                 prop_get_type_name(prop->type),
1162                                 next_sym->name ? next_sym->name : "<choice>");
1163                 } else if (stack->prop) {
1164                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1165                                 prop->file->name, prop->lineno,
1166                                 sym->name ? sym->name : "<choice>",
1167                                 next_sym->name ? next_sym->name : "<choice>");
1168                 } else if (sym_is_choice(sym)) {
1169                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1170                                 menu->file->name, menu->lineno,
1171                                 sym->name ? sym->name : "<choice>",
1172                                 next_sym->name ? next_sym->name : "<choice>");
1173                 } else if (sym_is_choice_value(sym)) {
1174                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1175                                 menu->file->name, menu->lineno,
1176                                 sym->name ? sym->name : "<choice>",
1177                                 next_sym->name ? next_sym->name : "<choice>");
1178                 } else {
1179                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1180                                 prop->file->name, prop->lineno,
1181                                 sym->name ? sym->name : "<choice>",
1182                                 next_sym->name ? next_sym->name : "<choice>");
1183                 }
1184         }
1185
1186         fprintf(stderr,
1187                 "For a resolution refer to Documentation/kbuild/kconfig-language.txt\n"
1188                 "subsection \"Kconfig recursive dependency limitations\"\n"
1189                 "\n");
1190
1191         if (check_top == &cv_stack)
1192                 dep_stack_remove();
1193 }
1194
1195 static struct symbol *sym_check_expr_deps(struct expr *e)
1196 {
1197         struct symbol *sym;
1198
1199         if (!e)
1200                 return NULL;
1201         switch (e->type) {
1202         case E_OR:
1203         case E_AND:
1204                 sym = sym_check_expr_deps(e->left.expr);
1205                 if (sym)
1206                         return sym;
1207                 return sym_check_expr_deps(e->right.expr);
1208         case E_NOT:
1209                 return sym_check_expr_deps(e->left.expr);
1210         case E_EQUAL:
1211         case E_GEQ:
1212         case E_GTH:
1213         case E_LEQ:
1214         case E_LTH:
1215         case E_UNEQUAL:
1216                 sym = sym_check_deps(e->left.sym);
1217                 if (sym)
1218                         return sym;
1219                 return sym_check_deps(e->right.sym);
1220         case E_SYMBOL:
1221                 return sym_check_deps(e->left.sym);
1222         default:
1223                 break;
1224         }
1225         fprintf(stderr, "Oops! How to check %d?\n", e->type);
1226         return NULL;
1227 }
1228
1229 /* return NULL when dependencies are OK */
1230 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1231 {
1232         struct symbol *sym2;
1233         struct property *prop;
1234         struct dep_stack stack;
1235
1236         dep_stack_insert(&stack, sym);
1237
1238         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1239         if (sym2)
1240                 goto out;
1241
1242         for (prop = sym->prop; prop; prop = prop->next) {
1243                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1244                         continue;
1245                 stack.prop = prop;
1246                 sym2 = sym_check_expr_deps(prop->visible.expr);
1247                 if (sym2)
1248                         break;
1249                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1250                         continue;
1251                 stack.expr = prop->expr;
1252                 sym2 = sym_check_expr_deps(prop->expr);
1253                 if (sym2)
1254                         break;
1255                 stack.expr = NULL;
1256         }
1257
1258 out:
1259         dep_stack_remove();
1260
1261         return sym2;
1262 }
1263
1264 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1265 {
1266         struct symbol *sym, *sym2;
1267         struct property *prop;
1268         struct expr *e;
1269         struct dep_stack stack;
1270
1271         dep_stack_insert(&stack, choice);
1272
1273         prop = sym_get_choice_prop(choice);
1274         expr_list_for_each_sym(prop->expr, e, sym)
1275                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1276
1277         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1278         sym2 = sym_check_sym_deps(choice);
1279         choice->flags &= ~SYMBOL_CHECK;
1280         if (sym2)
1281                 goto out;
1282
1283         expr_list_for_each_sym(prop->expr, e, sym) {
1284                 sym2 = sym_check_sym_deps(sym);
1285                 if (sym2)
1286                         break;
1287         }
1288 out:
1289         expr_list_for_each_sym(prop->expr, e, sym)
1290                 sym->flags &= ~SYMBOL_CHECK;
1291
1292         if (sym2 && sym_is_choice_value(sym2) &&
1293             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1294                 sym2 = choice;
1295
1296         dep_stack_remove();
1297
1298         return sym2;
1299 }
1300
1301 struct symbol *sym_check_deps(struct symbol *sym)
1302 {
1303         struct symbol *sym2;
1304         struct property *prop;
1305
1306         if (sym->flags & SYMBOL_CHECK) {
1307                 sym_check_print_recursive(sym);
1308                 return sym;
1309         }
1310         if (sym->flags & SYMBOL_CHECKED)
1311                 return NULL;
1312
1313         if (sym_is_choice_value(sym)) {
1314                 struct dep_stack stack;
1315
1316                 /* for choice groups start the check with main choice symbol */
1317                 dep_stack_insert(&stack, sym);
1318                 prop = sym_get_choice_prop(sym);
1319                 sym2 = sym_check_deps(prop_get_symbol(prop));
1320                 dep_stack_remove();
1321         } else if (sym_is_choice(sym)) {
1322                 sym2 = sym_check_choice_deps(sym);
1323         } else {
1324                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1325                 sym2 = sym_check_sym_deps(sym);
1326                 sym->flags &= ~SYMBOL_CHECK;
1327         }
1328
1329         if (sym2 && sym2 == sym)
1330                 sym2 = NULL;
1331
1332         return sym2;
1333 }
1334
1335 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1336 {
1337         struct property *prop;
1338         struct property **propp;
1339
1340         prop = xmalloc(sizeof(*prop));
1341         memset(prop, 0, sizeof(*prop));
1342         prop->type = type;
1343         prop->sym = sym;
1344         prop->file = current_file;
1345         prop->lineno = zconf_lineno();
1346
1347         /* append property to the prop list of symbol */
1348         if (sym) {
1349                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1350                         ;
1351                 *propp = prop;
1352         }
1353
1354         return prop;
1355 }
1356
1357 struct symbol *prop_get_symbol(struct property *prop)
1358 {
1359         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1360                            prop->expr->type == E_LIST))
1361                 return prop->expr->left.sym;
1362         return NULL;
1363 }
1364
1365 const char *prop_get_type_name(enum prop_type type)
1366 {
1367         switch (type) {
1368         case P_PROMPT:
1369                 return "prompt";
1370         case P_ENV:
1371                 return "env";
1372         case P_COMMENT:
1373                 return "comment";
1374         case P_MENU:
1375                 return "menu";
1376         case P_DEFAULT:
1377                 return "default";
1378         case P_CHOICE:
1379                 return "choice";
1380         case P_SELECT:
1381                 return "select";
1382         case P_IMPLY:
1383                 return "imply";
1384         case P_RANGE:
1385                 return "range";
1386         case P_SYMBOL:
1387                 return "symbol";
1388         case P_UNKNOWN:
1389                 break;
1390         }
1391         return "unknown";
1392 }
1393
1394 static void prop_add_env(const char *env)
1395 {
1396         struct symbol *sym, *sym2;
1397         struct property *prop;
1398         char *p;
1399
1400         sym = current_entry->sym;
1401         sym->flags |= SYMBOL_AUTO;
1402         for_all_properties(sym, prop, P_ENV) {
1403                 sym2 = prop_get_symbol(prop);
1404                 if (strcmp(sym2->name, env))
1405                         menu_warn(current_entry, "redefining environment symbol from %s",
1406                                   sym2->name);
1407                 return;
1408         }
1409
1410         prop = prop_alloc(P_ENV, sym);
1411         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1412
1413         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1414         sym_env_list->right.sym = sym;
1415
1416         p = getenv(env);
1417         if (p)
1418                 sym_add_default(sym, p);
1419         else
1420                 menu_warn(current_entry, "environment variable %s undefined", env);
1421 }