adk/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 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_calc_visibility(struct symbol *sym)
 190 {
 191         struct property *prop;
 192         tristate tri;
 193         struct expr_select_value *esv;
 194
 195         /* any prompt visible? */
 196         tri = no;
 197         for_all_prompts(sym, prop) {
 198                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 199                 tri = EXPR_OR(tri, prop->visible.tri);
 200         }
 201         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 202                 tri = yes;
 203         if (sym->visible != tri) {
 204                 sym->visible = tri;
 205                 sym_set_changed(sym);
 206         }
 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         for (esv = sym->val_dep; esv; esv = esv->next) {
 227                 tri = expr_calc_value(esv->expr);
 228                 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 229                         tri = yes;
 230                 if (esv->tri != tri) {
 231                         esv->tri = tri;
 232                         sym_set_changed(sym);
 233                 }
 234         }
 235 }
 236
 237 /*
 238  * Find the default symbol for a choice.
 239  * First try the default values for the choice symbol
 240  * Next locate the first visible choice value
 241  * Return NULL if none was found
 242  */
 243 struct symbol *sym_choice_default(struct symbol *sym)
 244 {
 245         struct symbol *def_sym;
 246         struct symbol *ret = NULL;
 247         struct property *prop;
 248         struct expr *e;
 249
 250         /* check to see if any are selected */
 251         prop = sym_get_choice_prop(sym);
 252         expr_list_for_each_sym(prop->expr, e, def_sym)
 253                 if (def_sym->rev_dep.tri != no) {
 254                         if (ret)
 255                                 fprintf(stderr, "warning: conflicting selects "
 256                                         "on choice block: %s\n", sym->name);
 257                         else
 258                                 ret = def_sym;
 259                 }
 260         if (ret)
 261                 return ret;
 262
 263         /* any of the defaults visible? */
 264         for_all_defaults(sym, prop) {
 265                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 266                 if (prop->visible.tri == no)
 267                         continue;
 268                 def_sym = prop_get_symbol(prop);
 269                 if (def_sym->visible != no)
 270                         return def_sym;
 271         }
 272
 273         /* just get the first visible value */
 274         prop = sym_get_choice_prop(sym);
 275         expr_list_for_each_sym(prop->expr, e, def_sym)
 276                 if (def_sym->visible != no)
 277                         return def_sym;
 278
 279         /* failed to locate any defaults */
 280         return NULL;
 281 }
 282
 283 static struct symbol *sym_calc_choice(struct symbol *sym)
 284 {
 285         struct symbol *def_sym;
 286         struct property *prop;
 287         struct expr *e;
 288         int flags;
 289
 290         /* first calculate all choice values' visibilities */
 291         flags = sym->flags;
 292         prop = sym_get_choice_prop(sym);
 293         expr_list_for_each_sym(prop->expr, e, def_sym) {
 294                 sym_calc_visibility(def_sym);
 295                 if (def_sym->visible != no)
 296                         flags &= def_sym->flags;
 297         }
 298
 299         sym->flags &= flags | ~SYMBOL_DEF_USER;
 300
 301         /* is the user choice visible? */
 302         def_sym = sym->def[S_DEF_USER].val;
 303         if (def_sym && def_sym->visible != no)
 304                 return def_sym;
 305
 306         def_sym = sym_choice_default(sym);
 307
 308         if (def_sym == NULL)
 309                 /* no choice? reset tristate value */
 310                 sym->curr.tri = no;
 311
 312         return def_sym;
 313 }
 314
 315 void sym_calc_value(struct symbol *sym)
 316 {
 317         struct symbol_value newval, oldval;
 318         struct property *prop;
 319         struct expr *e;
 320         struct expr_select_value *esv;
 321         int got_sel_val;
 322
 323         if (!sym)
 324                 return;
 325
 326         if (sym->flags & SYMBOL_VALID)
 327                 return;
 328
 329         if (sym_is_choice_value(sym) &&
 330             sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
 331                 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
 332                 prop = sym_get_choice_prop(sym);
 333                 sym_calc_value(prop_get_symbol(prop));
 334         }
 335
 336         sym->flags |= SYMBOL_VALID;
 337
 338         oldval = sym->curr;
 339
 340         switch (sym->type) {
 341         case S_INT:
 342         case S_HEX:
 343         case S_STRING:
 344                 newval = symbol_empty.curr;
 345                 break;
 346         case S_BOOLEAN:
 347         case S_TRISTATE:
 348                 newval = symbol_no.curr;
 349                 break;
 350         default:
 351                 sym->curr.val = sym->name;
 352                 sym->curr.tri = no;
 353                 return;
 354         }
 355         if (!sym_is_choice_value(sym))
 356                 sym->flags &= ~SYMBOL_WRITE;
 357
 358         sym_calc_visibility(sym);
 359
 360         /* set default if recursively called */
 361         sym->curr = newval;
 362
 363         switch (sym_get_type(sym)) {
 364         case S_BOOLEAN:
 365         case S_TRISTATE:
 366                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 367                         prop = sym_get_choice_prop(sym);
 368                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 369                 } else {
 370                         if (sym->visible != no) {
 371                                 /* if the symbol is visible use the user value
 372                                  * if available, otherwise try the default value
 373                                  */
 374                                 sym->flags |= SYMBOL_WRITE;
 375                                 if (sym_has_value(sym)) {
 376                                         newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 377                                                               sym->visible);
 378                                         goto calc_newval;
 379                                 }
 380                         }
 381                         if (sym->rev_dep.tri != no)
 382                                 sym->flags |= SYMBOL_WRITE;
 383                         for (esv = sym->val_dep; esv; esv = esv->next)
 384                                 if (esv->tri != no)
 385                                         sym->flags |= SYMBOL_WRITE;
 386                         if (!sym_is_choice(sym)) {
 387                                 prop = sym_get_default_prop(sym);
 388                                 if (prop) {
 389                                         sym->flags |= SYMBOL_WRITE;
 390                                         newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 391                                                               prop->visible.tri);
 392                                 }
 393                         }
 394                 calc_newval:
 395                         if (sym->dir_dep.tri == no) {
 396                                 /*
 397                                 if (sym->rev_dep.tri != no) {
 398                                         fprintf(stderr, "warning: (");
 399                                         expr_fprint(sym->rev_dep.expr, stderr);
 400                                         fprintf(stderr, ") selects %s which has unmet direct dependencies (",
 401                                                 sym->name);
 402                                         expr_fprint(sym->dir_dep.expr, stderr);
 403                                         fprintf(stderr, ")\n");
 404                                 }
 405                                 */
 406                                 for (esv = sym->val_dep; esv; esv = esv->next) {
 407                                         if ((esv->tri != no) &&
 408                                             (expr_calc_value(esv->value) != no)) {
 409                                                 fprintf(stderr, "warning: (");
 410                                                 expr_fprint(esv->expr, stderr);
 411                                                 fprintf(stderr, ") selects %s (with value ",
 412                                                         sym->name);
 413                                                 expr_fprint(esv->value, stderr);
 414                                                 fprintf(stderr, ") which has unmet direct dependencies (");
 415                                                 expr_fprint(sym->dir_dep.expr, stderr);
 416                                                 fprintf(stderr, ")\n");
 417                                         }
 418                                 }
 419                         }
 420                         newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 421                         for (esv = sym->val_dep; esv; esv = esv->next)
 422                                 if (esv->tri != no)
 423                                         newval.tri = EXPR_OR(newval.tri,
 424                                                 expr_calc_value(esv->value));
 425                 }
 426                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 427                         newval.tri = yes;
 428                 break;
 429         case S_STRING:
 430         case S_HEX:
 431         case S_INT:
 432                 if (sym->visible != no) {
 433                         sym->flags |= SYMBOL_WRITE;
 434                         if (sym_has_value(sym)) {
 435                                 newval.val = sym->def[S_DEF_USER].val;
 436                                 break;
 437                         }
 438                 }
 439                 got_sel_val = 0;
 440                 for (esv = sym->val_dep; esv; esv = esv->next) {
 441                         if (esv->tri != no) {
 442                                 struct symbol *ss = esv->value->left.sym;
 443
 444                                 if (got_sel_val) {
 445                                         /* warn of more than one value selected */
 446                                 } else {
 447                                         sym->flags |= SYMBOL_WRITE;
 448                                         sym_calc_value(ss);
 449                                         newval.val = ss->curr.val;
 450                                         got_sel_val = 1;
 451                                 }
 452                         }
 453                 }
 454                 if (got_sel_val)
 455                         break;
 456                 prop = sym_get_default_prop(sym);
 457                 if (prop) {
 458                         struct symbol *ds = prop_get_symbol(prop);
 459                         if (ds) {
 460                                 sym->flags |= SYMBOL_WRITE;
 461                                 sym_calc_value(ds);
 462                                 newval.val = ds->curr.val;
 463                         }
 464                 }
 465                 break;
 466         default:
 467                 ;
 468         }
 469
 470         sym->curr = newval;
 471         if (sym_is_choice(sym) && newval.tri == yes)
 472                 sym->curr.val = sym_calc_choice(sym);
 473         sym_validate_range(sym);
 474
 475         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 476                 sym_set_changed(sym);
 477                 if (modules_sym == sym) {
 478                         sym_set_all_changed();
 479                         modules_val = modules_sym->curr.tri;
 480                 }
 481         }
 482
 483         if (sym_is_choice(sym)) {
 484                 struct symbol *choice_sym;
 485
 486                 prop = sym_get_choice_prop(sym);
 487                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 488                         if ((sym->flags & SYMBOL_WRITE) &&
 489                             choice_sym->visible != no)
 490                                 choice_sym->flags |= SYMBOL_WRITE;
 491                         if (sym->flags & SYMBOL_CHANGED)
 492                                 sym_set_changed(choice_sym);
 493                 }
 494         }
 495
 496         if (sym->flags & SYMBOL_AUTO)
 497                 sym->flags &= ~SYMBOL_WRITE;
 498
 499         if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
 500                 set_all_choice_values(sym);
 501 }
 502
 503 void sym_clear_all_valid(void)
 504 {
 505         struct symbol *sym;
 506         int i;
 507
 508         for_all_symbols(i, sym)
 509                 sym->flags &= ~SYMBOL_VALID;
 510         sym_add_change_count(1);
 511         if (modules_sym)
 512                 sym_calc_value(modules_sym);
 513 }
 514
 515 void sym_set_changed(struct symbol *sym)
 516 {
 517         struct property *prop;
 518
 519         sym->flags |= SYMBOL_CHANGED;
 520         for (prop = sym->prop; prop; prop = prop->next) {
 521                 if (prop->menu)
 522                         prop->menu->flags |= MENU_CHANGED;
 523         }
 524 }
 525
 526 void sym_set_all_changed(void)
 527 {
 528         struct symbol *sym;
 529         int i;
 530
 531         for_all_symbols(i, sym)
 532                 sym_set_changed(sym);
 533 }
 534
 535 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 536 {
 537         int type = sym_get_type(sym);
 538         struct expr_select_value *esv;
 539         tristate tri;
 540
 541         if (sym->visible == no)
 542                 return false;
 543
 544         if (type != S_BOOLEAN && type != S_TRISTATE)
 545                 return false;
 546
 547         if (type == S_BOOLEAN && val == mod)
 548                 return false;
 549         tri = sym->rev_dep.tri;
 550         for (esv = sym->val_dep; esv; esv = esv->next)
 551                 tri = EXPR_OR(tri, esv->tri);
 552         if (sym->visible <= tri)
 553                 return false;
 554         if (sym_is_choice_value(sym) && sym->visible == yes)
 555                 return val == yes;
 556         return val >= tri && val <= sym->visible;
 557 }
 558
 559 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 560 {
 561         tristate oldval = sym_get_tristate_value(sym);
 562
 563         if (oldval != val && !sym_tristate_within_range(sym, val))
 564                 return false;
 565
 566         if (!(sym->flags & SYMBOL_DEF_USER)) {
 567                 sym->flags |= SYMBOL_DEF_USER;
 568                 sym_set_changed(sym);
 569         }
 570         /*
 571          * setting a choice value also resets the new flag of the choice
 572          * symbol and all other choice values.
 573          */
 574         if (sym_is_choice_value(sym) && val == yes) {
 575                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 576                 struct property *prop;
 577                 struct expr *e;
 578
 579                 cs->def[S_DEF_USER].val = sym;
 580                 cs->flags |= SYMBOL_DEF_USER;
 581                 prop = sym_get_choice_prop(cs);
 582                 for (e = prop->expr; e; e = e->left.expr) {
 583                         if (e->right.sym->visible != no)
 584                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 585                 }
 586         }
 587
 588         sym->def[S_DEF_USER].tri = val;
 589         if (oldval != val)
 590                 sym_clear_all_valid();
 591
 592         return true;
 593 }
 594
 595 tristate sym_toggle_tristate_value(struct symbol *sym)
 596 {
 597         tristate oldval, newval;
 598
 599         oldval = newval = sym_get_tristate_value(sym);
 600         do {
 601                 switch (newval) {
 602                 case no:
 603                         newval = mod;
 604                         break;
 605                 case mod:
 606                         newval = yes;
 607                         break;
 608                 case yes:
 609                         newval = no;
 610                         break;
 611                 }
 612                 if (sym_set_tristate_value(sym, newval))
 613                         break;
 614         } while (oldval != newval);
 615         return newval;
 616 }
 617
 618 bool sym_string_valid(struct symbol *sym, const char *str)
 619 {
 620         signed char ch;
 621
 622         switch (sym->type) {
 623         case S_STRING:
 624                 return true;
 625         case S_INT:
 626                 ch = *str++;
 627                 if (ch == '-')
 628                         ch = *str++;
 629                 if (!isdigit(ch))
 630                         return false;
 631                 if (ch == '0' && *str != 0)
 632                         return false;
 633                 while ((ch = *str++)) {
 634                         if (!isdigit(ch))
 635                                 return false;
 636                 }
 637                 return true;
 638         case S_HEX:
 639                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 640                         str += 2;
 641                 ch = *str++;
 642                 do {
 643                         if (!isxdigit(ch))
 644                                 return false;
 645                 } while ((ch = *str++));
 646                 return true;
 647         case S_BOOLEAN:
 648         case S_TRISTATE:
 649                 switch (str[0]) {
 650                 case 'y': case 'Y':
 651                 case 'm': case 'M':
 652                 case 'n': case 'N':
 653                         return true;
 654                 }
 655                 return false;
 656         default:
 657                 return false;
 658         }
 659 }
 660
 661 bool sym_string_within_range(struct symbol *sym, const char *str)
 662 {
 663         struct property *prop;
 664         long long val;
 665
 666         switch (sym->type) {
 667         case S_STRING:
 668                 return sym_string_valid(sym, str);
 669         case S_INT:
 670                 if (!sym_string_valid(sym, str))
 671                         return false;
 672                 prop = sym_get_range_prop(sym);
 673                 if (!prop)
 674                         return true;
 675                 val = strtoll(str, NULL, 10);
 676                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 677                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 678         case S_HEX:
 679                 if (!sym_string_valid(sym, str))
 680                         return false;
 681                 prop = sym_get_range_prop(sym);
 682                 if (!prop)
 683                         return true;
 684                 val = strtoll(str, NULL, 16);
 685                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 686                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 687         case S_BOOLEAN:
 688         case S_TRISTATE:
 689                 switch (str[0]) {
 690                 case 'y': case 'Y':
 691                         return sym_tristate_within_range(sym, yes);
 692                 case 'm': case 'M':
 693                         return sym_tristate_within_range(sym, mod);
 694                 case 'n': case 'N':
 695                         return sym_tristate_within_range(sym, no);
 696                 }
 697                 return false;
 698         default:
 699                 return false;
 700         }
 701 }
 702
 703 bool sym_set_string_value(struct symbol *sym, const char *newval)
 704 {
 705         const char *oldval;
 706         char *val;
 707         int size;
 708
 709         switch (sym->type) {
 710         case S_BOOLEAN:
 711         case S_TRISTATE:
 712                 switch (newval[0]) {
 713                 case 'y': case 'Y':
 714                         return sym_set_tristate_value(sym, yes);
 715                 case 'm': case 'M':
 716                         return sym_set_tristate_value(sym, mod);
 717                 case 'n': case 'N':
 718                         return sym_set_tristate_value(sym, no);
 719                 }
 720                 return false;
 721         default:
 722                 ;
 723         }
 724
 725         if (!sym_string_within_range(sym, newval))
 726                 return false;
 727
 728         if (!(sym->flags & SYMBOL_DEF_USER)) {
 729                 sym->flags |= SYMBOL_DEF_USER;
 730                 sym_set_changed(sym);
 731         }
 732
 733         oldval = sym->def[S_DEF_USER].val;
 734         size = strlen(newval) + 1;
 735         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 736                 size += 2;
 737                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 738                 *val++ = '0';
 739                 *val++ = 'x';
 740         } else if (!oldval || strcmp(oldval, newval))
 741                 sym->def[S_DEF_USER].val = val = xmalloc(size);
 742         else
 743                 return true;
 744
 745         strcpy(val, newval);
 746         free((void *)oldval);
 747         sym_clear_all_valid();
 748
 749         return true;
 750 }
 751
 752 /*
 753  * Find the default value associated to a symbol.
 754  * For tristate symbol handle the modules=n case
 755  * in which case "m" becomes "y".
 756  * If the symbol does not have any default then fallback
 757  * to the fixed default values.
 758  */
 759 const char *sym_get_string_default(struct symbol *sym)
 760 {
 761         struct property *prop;
 762         struct symbol *ds;
 763         const char *str;
 764         tristate val;
 765
 766         sym_calc_visibility(sym);
 767         sym_calc_value(modules_sym);
 768         val = symbol_no.curr.tri;
 769         str = symbol_empty.curr.val;
 770
 771         /* If symbol has a default value look it up */
 772         prop = sym_get_default_prop(sym);
 773         if (prop != NULL) {
 774                 switch (sym->type) {
 775                 case S_BOOLEAN:
 776                 case S_TRISTATE:
 777                         /* The visibility may limit the value from yes => mod */
 778                         val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
 779                         break;
 780                 default:
 781                         /*
 782                          * The following fails to handle the situation
 783                          * where a default value is further limited by
 784                          * the valid range.
 785                          */
 786                         ds = prop_get_symbol(prop);
 787                         if (ds != NULL) {
 788                                 sym_calc_value(ds);
 789                                 str = (const char *)ds->curr.val;
 790                         }
 791                 }
 792         }
 793
 794         /* Handle select statements */
 795         val = EXPR_OR(val, sym->rev_dep.tri);
 796
 797         /* transpose mod to yes if modules are not enabled */
 798         if (val == mod)
 799                 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
 800                         val = yes;
 801
 802         /* transpose mod to yes if type is bool */
 803         if (sym->type == S_BOOLEAN && val == mod)
 804                 val = yes;
 805
 806         switch (sym->type) {
 807         case S_BOOLEAN:
 808         case S_TRISTATE:
 809                 switch (val) {
 810                 case no: return "n";
 811                 case mod: return "m";
 812                 case yes: return "y";
 813                 }
 814         case S_INT:
 815         case S_HEX:
 816                 return str;
 817         case S_STRING:
 818                 return str;
 819         case S_OTHER:
 820         case S_UNKNOWN:
 821                 break;
 822         }
 823         return "";
 824 }
 825
 826 const char *sym_get_string_value(struct symbol *sym)
 827 {
 828         tristate val;
 829
 830         switch (sym->type) {
 831         case S_BOOLEAN:
 832         case S_TRISTATE:
 833                 val = sym_get_tristate_value(sym);
 834                 switch (val) {
 835                 case no:
 836                         return "n";
 837                 case mod:
 838                         sym_calc_value(modules_sym);
 839                         return (modules_sym->curr.tri == no) ? "n" : "m";
 840                 case yes:
 841                         return "y";
 842                 }
 843                 break;
 844         default:
 845                 ;
 846         }
 847         return (const char *)sym->curr.val;
 848 }
 849
 850 bool sym_is_changable(struct symbol *sym)
 851 {
 852         tristate tri = sym->rev_dep.tri;
 853         struct expr_select_value *esv;
 854
 855         for (esv = sym->val_dep; esv; esv = esv->next)
 856                 tri = EXPR_OR(tri, esv->tri);
 857
 858         return sym->visible > tri;
 859 }
 860
 861 static unsigned strhash(const char *s)
 862 {
 863         /* fnv32 hash */
 864         unsigned hash = 2166136261U;
 865         for (; *s; s++)
 866                 hash = (hash ^ *s) * 0x01000193;
 867         return hash;
 868 }
 869
 870 struct symbol *sym_lookup(const char *name, int flags)
 871 {
 872         struct symbol *symbol;
 873         char *new_name;
 874         int hash;
 875
 876         if (name) {
 877                 if (name[0] && !name[1]) {
 878                         switch (name[0]) {
 879                         case 'y': return &symbol_yes;
 880                         case 'm': return &symbol_mod;
 881                         case 'n': return &symbol_no;
 882                         }
 883                 }
 884                 hash = strhash(name) % SYMBOL_HASHSIZE;
 885
 886                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 887                         if (symbol->name &&
 888                             !strcmp(symbol->name, name) &&
 889                             (flags ? symbol->flags & flags
 890                                    : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 891                                 return symbol;
 892                 }
 893                 new_name = strdup(name);
 894         } else {
 895                 new_name = NULL;
 896                 hash = 0;
 897         }
 898
 899         symbol = xmalloc(sizeof(*symbol));
 900         memset(symbol, 0, sizeof(*symbol));
 901         symbol->name = new_name;
 902         symbol->type = S_UNKNOWN;
 903         symbol->flags |= flags;
 904
 905         symbol->next = symbol_hash[hash];
 906         symbol_hash[hash] = symbol;
 907
 908         return symbol;
 909 }
 910
 911 struct symbol *sym_find(const char *name)
 912 {
 913         struct symbol *symbol = NULL;
 914         int hash = 0;
 915
 916         if (!name)
 917                 return NULL;
 918
 919         if (name[0] && !name[1]) {
 920                 switch (name[0]) {
 921                 case 'y': return &symbol_yes;
 922                 case 'm': return &symbol_mod;
 923                 case 'n': return &symbol_no;
 924                 }
 925         }
 926         hash = strhash(name) % SYMBOL_HASHSIZE;
 927
 928         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 929                 if (symbol->name &&
 930                     !strcmp(symbol->name, name) &&
 931                     !(symbol->flags & SYMBOL_CONST))
 932                                 break;
 933         }
 934
 935         return symbol;
 936 }
 937
 938 /*
 939  * Expand symbol's names embedded in the string given in argument. Symbols'
 940  * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
 941  * the empty string.
 942  */
 943 const char *sym_expand_string_value(const char *in)
 944 {
 945         const char *src;
 946         char *res;
 947         size_t reslen;
 948
 949         reslen = strlen(in) + 1;
 950         res = xmalloc(reslen);
 951         res[0] = '\0';
 952
 953         while ((src = strchr(in, '$'))) {
 954                 char *p, name[SYMBOL_MAXLENGTH];
 955                 const char *symval = "";
 956                 struct symbol *sym;
 957                 size_t newlen;
 958
 959                 strncat(res, in, src - in);
 960                 src++;
 961
 962                 p = name;
 963                 while (isalnum(*src) || *src == '_')
 964                         *p++ = *src++;
 965                 *p = '\0';
 966
 967                 sym = sym_find(name);
 968                 if (sym != NULL) {
 969                         sym_calc_value(sym);
 970                         symval = sym_get_string_value(sym);
 971                 }
 972
 973                 newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
 974                 if (newlen > reslen) {
 975                         reslen = newlen;
 976                         res = realloc(res, reslen);
 977                 }
 978
 979                 strcat(res, symval);
 980                 in = src;
 981         }
 982         strcat(res, in);
 983
 984         return res;
 985 }
 986
 987 const char *sym_escape_string_value(const char *in)
 988 {
 989         const char *p;
 990         size_t reslen;
 991         char *res;
 992         size_t l;
 993
 994         reslen = strlen(in) + strlen("\"\"") + 1;
 995
 996         p = in;
 997         for (;;) {
 998                 l = strcspn(p, "\"\\");
 999                 p += l;
1000
1001                 if (p[0] == '\0')
1002                         break;
1003
1004                 reslen++;
1005                 p++;
1006         }
1007
1008         res = xmalloc(reslen);
1009         res[0] = '\0';
1010
1011         strcat(res, "\"");
1012
1013         p = in;
1014         for (;;) {
1015                 l = strcspn(p, "\"\\");
1016                 strncat(res, p, l);
1017                 p += l;
1018
1019                 if (p[0] == '\0')
1020                         break;
1021
1022                 strcat(res, "\\");
1023                 strncat(res, p++, 1);
1024         }
1025
1026         strcat(res, "\"");
1027         return res;
1028 }
1029
1030 struct sym_match {
1031         struct symbol   *sym;
1032         off_t           so, eo;
1033 };
1034
1035 /* Compare matched symbols as thus:
1036  * - first, symbols that match exactly
1037  * - then, alphabetical sort
1038  */
1039 static int sym_rel_comp(const void *sym1, const void *sym2)
1040 {
1041         const struct sym_match *s1 = sym1;
1042         const struct sym_match *s2 = sym2;
1043         int exact1, exact2;
1044
1045         /* Exact match:
1046          * - if matched length on symbol s1 is the length of that symbol,
1047          *   then this symbol should come first;
1048          * - if matched length on symbol s2 is the length of that symbol,
1049          *   then this symbol should come first.
1050          * Note: since the search can be a regexp, both symbols may match
1051          * exactly; if this is the case, we can't decide which comes first,
1052          * and we fallback to sorting alphabetically.
1053          */
1054         exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
1055         exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
1056         if (exact1 && !exact2)
1057                 return -1;
1058         if (!exact1 && exact2)
1059                 return 1;
1060
1061         /* As a fallback, sort symbols alphabetically */
1062         return strcmp(s1->sym->name, s2->sym->name);
1063 }
1064
1065 struct symbol **sym_re_search(const char *pattern)
1066 {
1067         struct symbol *sym, **sym_arr = NULL;
1068         struct sym_match *sym_match_arr = NULL;
1069         int i, cnt, size;
1070         regex_t re;
1071         regmatch_t match[1];
1072
1073         cnt = size = 0;
1074         /* Skip if empty */
1075         if (strlen(pattern) == 0)
1076                 return NULL;
1077         if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
1078                 return NULL;
1079
1080         for_all_symbols(i, sym) {
1081                 if (sym->flags & SYMBOL_CONST || !sym->name)
1082                         continue;
1083                 if (regexec(&re, sym->name, 1, match, 0))
1084                         continue;
1085                 if (cnt >= size) {
1086                         void *tmp;
1087                         size += 16;
1088                         tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
1089                         if (!tmp)
1090                                 goto sym_re_search_free;
1091                         sym_match_arr = tmp;
1092                 }
1093                 sym_calc_value(sym);
1094                 /* As regexec returned 0, we know we have a match, so
1095                  * we can use match[0].rm_[se]o without further checks
1096                  */
1097                 sym_match_arr[cnt].so = match[0].rm_so;
1098                 sym_match_arr[cnt].eo = match[0].rm_eo;
1099                 sym_match_arr[cnt++].sym = sym;
1100         }
1101         if (sym_match_arr) {
1102                 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
1103                 sym_arr = malloc((cnt+1) * sizeof(struct symbol));
1104                 if (!sym_arr)
1105                         goto sym_re_search_free;
1106                 for (i = 0; i < cnt; i++)
1107                         sym_arr[i] = sym_match_arr[i].sym;
1108                 sym_arr[cnt] = NULL;
1109         }
1110 sym_re_search_free:
1111         /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
1112         free(sym_match_arr);
1113         regfree(&re);
1114
1115         return sym_arr;
1116 }
1117
1118 /*
1119  * When we check for recursive dependencies we use a stack to save
1120  * current state so we can print out relevant info to user.
1121  * The entries are located on the call stack so no need to free memory.
1122  * Note insert() remove() must always match to properly clear the stack.
1123  */
1124 static struct dep_stack {
1125         struct dep_stack *prev, *next;
1126         struct symbol *sym;
1127         struct property *prop;
1128         struct expr *expr;
1129 } *check_top;
1130
1131 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1132 {
1133         memset(stack, 0, sizeof(*stack));
1134         if (check_top)
1135                 check_top->next = stack;
1136         stack->prev = check_top;
1137         stack->sym = sym;
1138         check_top = stack;
1139 }
1140
1141 static void dep_stack_remove(void)
1142 {
1143         check_top = check_top->prev;
1144         if (check_top)
1145                 check_top->next = NULL;
1146 }
1147
1148 /*
1149  * Called when we have detected a recursive dependency.
1150  * check_top point to the top of the stact so we use
1151  * the ->prev pointer to locate the bottom of the stack.
1152  */
1153 static void sym_check_print_recursive(struct symbol *last_sym)
1154 {
1155         struct dep_stack *stack;
1156         struct symbol *sym, *next_sym;
1157         struct menu *menu = NULL;
1158         struct property *prop;
1159         struct dep_stack cv_stack;
1160
1161         if (sym_is_choice_value(last_sym)) {
1162                 dep_stack_insert(&cv_stack, last_sym);
1163                 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1164         }
1165
1166         for (stack = check_top; stack != NULL; stack = stack->prev)
1167                 if (stack->sym == last_sym)
1168                         break;
1169         if (!stack) {
1170                 fprintf(stderr, "unexpected recursive dependency error\n");
1171                 return;
1172         }
1173
1174         for (; stack; stack = stack->next) {
1175                 sym = stack->sym;
1176                 next_sym = stack->next ? stack->next->sym : last_sym;
1177                 prop = stack->prop;
1178                 if (prop == NULL)
1179                         prop = stack->sym->prop;
1180
1181                 /* for choice values find the menu entry (used below) */
1182                 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1183                         for (prop = sym->prop; prop; prop = prop->next) {
1184                                 menu = prop->menu;
1185                                 if (prop->menu)
1186                                         break;
1187                         }
1188                 }
1189                 if (stack->sym == last_sym)
1190                         fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1191                                 prop->file->name, prop->lineno);
1192                 if (stack->expr) {
1193                         fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1194                                 prop->file->name, prop->lineno,
1195                                 sym->name ? sym->name : "<choice>",
1196                                 prop_get_type_name(prop->type),
1197                                 next_sym->name ? next_sym->name : "<choice>");
1198                 } else if (stack->prop) {
1199                         fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1200                                 prop->file->name, prop->lineno,
1201                                 sym->name ? sym->name : "<choice>",
1202                                 next_sym->name ? next_sym->name : "<choice>");
1203                 } else if (sym_is_choice(sym)) {
1204                         fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1205                                 menu->file->name, menu->lineno,
1206                                 sym->name ? sym->name : "<choice>",
1207                                 next_sym->name ? next_sym->name : "<choice>");
1208                 } else if (sym_is_choice_value(sym)) {
1209                         fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1210                                 menu->file->name, menu->lineno,
1211                                 sym->name ? sym->name : "<choice>",
1212                                 next_sym->name ? next_sym->name : "<choice>");
1213                 } else {
1214                         fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1215                                 prop->file->name, prop->lineno,
1216                                 sym->name ? sym->name : "<choice>",
1217                                 next_sym->name ? next_sym->name : "<choice>");
1218                 }
1219         }
1220
1221         if (check_top == &cv_stack)
1222                 dep_stack_remove();
1223 }
1224
1225 static struct symbol *sym_check_expr_deps(struct expr *e)
1226 {
1227         struct symbol *sym;
1228
1229         if (!e)
1230                 return NULL;
1231         switch (e->type) {
1232         case E_OR:
1233         case E_AND:
1234                 sym = sym_check_expr_deps(e->left.expr);
1235                 if (sym)
1236                         return sym;
1237                 return sym_check_expr_deps(e->right.expr);
1238         case E_NOT:
1239                 return sym_check_expr_deps(e->left.expr);
1240         case E_EQUAL:
1241         case E_UNEQUAL:
1242                 sym = sym_check_deps(e->left.sym);
1243                 if (sym)
1244                         return sym;
1245                 return sym_check_deps(e->right.sym);
1246         case E_SYMBOL:
1247                 return sym_check_deps(e->left.sym);
1248         default:
1249                 break;
1250         }
1251         printf("Oops! How to check %d?\n", e->type);
1252         return NULL;
1253 }
1254
1255 /* return NULL when dependencies are OK */
1256 static struct symbol *sym_check_sym_deps(struct symbol *sym)
1257 {
1258         struct symbol *sym2;
1259         struct property *prop;
1260         struct dep_stack stack;
1261
1262         dep_stack_insert(&stack, sym);
1263
1264         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1265         if (sym2)
1266                 goto out;
1267
1268         for (prop = sym->prop; prop; prop = prop->next) {
1269                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
1270                         continue;
1271                 stack.prop = prop;
1272                 sym2 = sym_check_expr_deps(prop->visible.expr);
1273                 if (sym2)
1274                         break;
1275                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1276                         continue;
1277                 stack.expr = prop->expr;
1278                 sym2 = sym_check_expr_deps(prop->expr);
1279                 if (sym2)
1280                         break;
1281                 stack.expr = NULL;
1282         }
1283
1284 out:
1285         dep_stack_remove();
1286
1287         return sym2;
1288 }
1289
1290 static struct symbol *sym_check_choice_deps(struct symbol *choice)
1291 {
1292         struct symbol *sym, *sym2;
1293         struct property *prop;
1294         struct expr *e;
1295         struct dep_stack stack;
1296
1297         dep_stack_insert(&stack, choice);
1298
1299         prop = sym_get_choice_prop(choice);
1300         expr_list_for_each_sym(prop->expr, e, sym)
1301                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1302
1303         choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1304         sym2 = sym_check_sym_deps(choice);
1305         choice->flags &= ~SYMBOL_CHECK;
1306         if (sym2)
1307                 goto out;
1308
1309         expr_list_for_each_sym(prop->expr, e, sym) {
1310                 sym2 = sym_check_sym_deps(sym);
1311                 if (sym2)
1312                         break;
1313         }
1314 out:
1315         expr_list_for_each_sym(prop->expr, e, sym)
1316                 sym->flags &= ~SYMBOL_CHECK;
1317
1318         if (sym2 && sym_is_choice_value(sym2) &&
1319             prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1320                 sym2 = choice;
1321
1322         dep_stack_remove();
1323
1324         return sym2;
1325 }
1326
1327 struct symbol *sym_check_deps(struct symbol *sym)
1328 {
1329         struct symbol *sym2;
1330         struct property *prop;
1331
1332         if (sym->flags & SYMBOL_CHECK) {
1333                 sym_check_print_recursive(sym);
1334                 return sym;
1335         }
1336         if (sym->flags & SYMBOL_CHECKED)
1337                 return NULL;
1338
1339         if (sym_is_choice_value(sym)) {
1340                 struct dep_stack stack;
1341
1342                 /* for choice groups start the check with main choice symbol */
1343                 dep_stack_insert(&stack, sym);
1344                 prop = sym_get_choice_prop(sym);
1345                 sym2 = sym_check_deps(prop_get_symbol(prop));
1346                 dep_stack_remove();
1347         } else if (sym_is_choice(sym)) {
1348                 sym2 = sym_check_choice_deps(sym);
1349         } else {
1350                 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1351                 sym2 = sym_check_sym_deps(sym);
1352                 sym->flags &= ~SYMBOL_CHECK;
1353         }
1354
1355         if (sym2 && sym2 == sym)
1356                 sym2 = NULL;
1357
1358         return sym2;
1359 }
1360
1361 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
1362 {
1363         struct property *prop;
1364         struct property **propp;
1365
1366         prop = xmalloc(sizeof(*prop));
1367         memset(prop, 0, sizeof(*prop));
1368         prop->type = type;
1369         prop->sym = sym;
1370         prop->file = current_file;
1371         prop->lineno = zconf_lineno();
1372
1373         /* append property to the prop list of symbol */
1374         if (sym) {
1375                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
1376                         ;
1377                 *propp = prop;
1378         }
1379
1380         return prop;
1381 }
1382
1383 struct symbol *prop_get_symbol(struct property *prop)
1384 {
1385         if (prop->expr && (prop->expr->type == E_SYMBOL ||
1386                            prop->expr->type == E_LIST))
1387                 return prop->expr->left.sym;
1388         return NULL;
1389 }
1390
1391 const char *prop_get_type_name(enum prop_type type)
1392 {
1393         switch (type) {
1394         case P_PROMPT:
1395                 return "prompt";
1396         case P_ENV:
1397                 return "env";
1398         case P_COMMENT:
1399                 return "comment";
1400         case P_MENU:
1401                 return "menu";
1402         case P_DEFAULT:
1403                 return "default";
1404         case P_CHOICE:
1405                 return "choice";
1406         case P_SELECT:
1407                 return "select";
1408         case P_RANGE:
1409                 return "range";
1410         case P_SYMBOL:
1411                 return "symbol";
1412         case P_UNKNOWN:
1413                 break;
1414         }
1415         return "unknown";
1416 }
1417
1418 static void prop_add_env(const char *env)
1419 {
1420         struct symbol *sym, *sym2;
1421         struct property *prop;
1422         char *p;
1423
1424         sym = current_entry->sym;
1425         sym->flags |= SYMBOL_AUTO;
1426         for_all_properties(sym, prop, P_ENV) {
1427                 sym2 = prop_get_symbol(prop);
1428                 if (strcmp(sym2->name, env))
1429                         menu_warn(current_entry, "redefining environment symbol from %s",
1430                                   sym2->name);
1431                 return;
1432         }
1433
1434         prop = prop_alloc(P_ENV, sym);
1435         prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
1436
1437         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
1438         sym_env_list->right.sym = sym;
1439
1440         p = getenv(env);
1441         if (p)
1442                 sym_add_default(sym, p);
1443         else
1444                 menu_warn(current_entry, "environment variable %s undefined", env);
1445 }