config/symbol.c

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