scripts/kconfig/symbol.c

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