git.oblomov.eu Git - linux-2.6/blob - scripts/kconfig/symbol.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <ctype.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <regex.h>
  10 #include <sys/utsname.h>
  11
  12 #define LKC_DIRECT_LINK
  13 #include "lkc.h"
  14
  15 struct symbol symbol_yes = {
  16         .name = "y",
  17         .curr = { "y", yes },
  18         .flags = SYMBOL_CONST|SYMBOL_VALID,
  19 }, symbol_mod = {
  20         .name = "m",
  21         .curr = { "m", mod },
  22         .flags = SYMBOL_CONST|SYMBOL_VALID,
  23 }, symbol_no = {
  24         .name = "n",
  25         .curr = { "n", no },
  26         .flags = SYMBOL_CONST|SYMBOL_VALID,
  27 }, symbol_empty = {
  28         .name = "",
  29         .curr = { "", no },
  30         .flags = SYMBOL_VALID,
  31 };
  32
  33 struct symbol *sym_defconfig_list;
  34 struct symbol *modules_sym;
  35 tristate modules_val;
  36
  37 struct expr *sym_env_list;
  38
  39 void sym_add_default(struct symbol *sym, const char *def)
  40 {
  41         struct property *prop = prop_alloc(P_DEFAULT, sym);
  42
  43         prop->expr = expr_alloc_symbol(sym_lookup(def, 1));
  44 }
  45
  46 void sym_init(void)
  47 {
  48         struct symbol *sym;
  49         struct utsname uts;
  50         char *p;
  51         static bool inited = false;
  52
  53         if (inited)
  54                 return;
  55         inited = true;
  56
  57         uname(&uts);
  58
  59         sym = sym_lookup("ARCH", 0);
  60         sym->type = S_STRING;
  61         sym->flags |= SYMBOL_AUTO;
  62         p = getenv("ARCH");
  63         if (p)
  64                 sym_add_default(sym, p);
  65
  66         sym = sym_lookup("KERNELVERSION", 0);
  67         sym->type = S_STRING;
  68         sym->flags |= SYMBOL_AUTO;
  69         p = getenv("KERNELVERSION");
  70         if (p)
  71                 sym_add_default(sym, p);
  72
  73         sym = sym_lookup("UNAME_RELEASE", 0);
  74         sym->type = S_STRING;
  75         sym->flags |= SYMBOL_AUTO;
  76         sym_add_default(sym, uts.release);
  77 }
  78
  79 enum symbol_type sym_get_type(struct symbol *sym)
  80 {
  81         enum symbol_type type = sym->type;
  82
  83         if (type == S_TRISTATE) {
  84                 if (sym_is_choice_value(sym) && sym->visible == yes)
  85                         type = S_BOOLEAN;
  86                 else if (modules_val == no)
  87                         type = S_BOOLEAN;
  88         }
  89         return type;
  90 }
  91
  92 const char *sym_type_name(enum symbol_type type)
  93 {
  94         switch (type) {
  95         case S_BOOLEAN:
  96                 return "boolean";
  97         case S_TRISTATE:
  98                 return "tristate";
  99         case S_INT:
 100                 return "integer";
 101         case S_HEX:
 102                 return "hex";
 103         case S_STRING:
 104                 return "string";
 105         case S_UNKNOWN:
 106                 return "unknown";
 107         case S_OTHER:
 108                 break;
 109         }
 110         return "???";
 111 }
 112
 113 struct property *sym_get_choice_prop(struct symbol *sym)
 114 {
 115         struct property *prop;
 116
 117         for_all_choices(sym, prop)
 118                 return prop;
 119         return NULL;
 120 }
 121
 122 struct property *sym_get_env_prop(struct symbol *sym)
 123 {
 124         struct property *prop;
 125
 126         for_all_properties(sym, prop, P_ENV)
 127                 return prop;
 128         return NULL;
 129 }
 130
 131 struct property *sym_get_default_prop(struct symbol *sym)
 132 {
 133         struct property *prop;
 134
 135         for_all_defaults(sym, prop) {
 136                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 137                 if (prop->visible.tri != no)
 138                         return prop;
 139         }
 140         return NULL;
 141 }
 142
 143 struct property *sym_get_range_prop(struct symbol *sym)
 144 {
 145         struct property *prop;
 146
 147         for_all_properties(sym, prop, P_RANGE) {
 148                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 149                 if (prop->visible.tri != no)
 150                         return prop;
 151         }
 152         return NULL;
 153 }
 154
 155 static int sym_get_range_val(struct symbol *sym, int base)
 156 {
 157         sym_calc_value(sym);
 158         switch (sym->type) {
 159         case S_INT:
 160                 base = 10;
 161                 break;
 162         case S_HEX:
 163                 base = 16;
 164                 break;
 165         default:
 166                 break;
 167         }
 168         return strtol(sym->curr.val, NULL, base);
 169 }
 170
 171 static void sym_validate_range(struct symbol *sym)
 172 {
 173         struct property *prop;
 174         int base, val, val2;
 175         char str[64];
 176
 177         switch (sym->type) {
 178         case S_INT:
 179                 base = 10;
 180                 break;
 181         case S_HEX:
 182                 base = 16;
 183                 break;
 184         default:
 185                 return;
 186         }
 187         prop = sym_get_range_prop(sym);
 188         if (!prop)
 189                 return;
 190         val = strtol(sym->curr.val, NULL, base);
 191         val2 = sym_get_range_val(prop->expr->left.sym, base);
 192         if (val >= val2) {
 193                 val2 = sym_get_range_val(prop->expr->right.sym, base);
 194                 if (val <= val2)
 195                         return;
 196         }
 197         if (sym->type == S_INT)
 198                 sprintf(str, "%d", val2);
 199         else
 200                 sprintf(str, "0x%x", val2);
 201         sym->curr.val = strdup(str);
 202 }
 203
 204 static void sym_calc_visibility(struct symbol *sym)
 205 {
 206         struct property *prop;
 207         tristate tri;
 208
 209         /* any prompt visible? */
 210         tri = no;
 211         for_all_prompts(sym, prop) {
 212                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 213                 tri = EXPR_OR(tri, prop->visible.tri);
 214         }
 215         if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
 216                 tri = yes;
 217         if (sym->visible != tri) {
 218                 sym->visible = tri;
 219                 sym_set_changed(sym);
 220         }
 221         if (sym_is_choice_value(sym))
 222                 return;
 223         tri = no;
 224         if (sym->rev_dep.expr)
 225                 tri = expr_calc_value(sym->rev_dep.expr);
 226         if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 227                 tri = yes;
 228         if (sym->rev_dep.tri != tri) {
 229                 sym->rev_dep.tri = tri;
 230                 sym_set_changed(sym);
 231         }
 232 }
 233
 234 static struct symbol *sym_calc_choice(struct symbol *sym)
 235 {
 236         struct symbol *def_sym;
 237         struct property *prop;
 238         struct expr *e;
 239
 240         /* is the user choice visible? */
 241         def_sym = sym->def[S_DEF_USER].val;
 242         if (def_sym) {
 243                 sym_calc_visibility(def_sym);
 244                 if (def_sym->visible != no)
 245                         return def_sym;
 246         }
 247
 248         /* any of the defaults visible? */
 249         for_all_defaults(sym, prop) {
 250                 prop->visible.tri = expr_calc_value(prop->visible.expr);
 251                 if (prop->visible.tri == no)
 252                         continue;
 253                 def_sym = prop_get_symbol(prop);
 254                 sym_calc_visibility(def_sym);
 255                 if (def_sym->visible != no)
 256                         return def_sym;
 257         }
 258
 259         /* just get the first visible value */
 260         prop = sym_get_choice_prop(sym);
 261         expr_list_for_each_sym(prop->expr, e, def_sym) {
 262                 sym_calc_visibility(def_sym);
 263                 if (def_sym->visible != no)
 264                         return def_sym;
 265         }
 266
 267         /* no choice? reset tristate value */
 268         sym->curr.tri = no;
 269         return NULL;
 270 }
 271
 272 void sym_calc_value(struct symbol *sym)
 273 {
 274         struct symbol_value newval, oldval;
 275         struct property *prop;
 276         struct expr *e;
 277
 278         if (!sym)
 279                 return;
 280
 281         if (sym->flags & SYMBOL_VALID)
 282                 return;
 283         sym->flags |= SYMBOL_VALID;
 284
 285         oldval = sym->curr;
 286
 287         switch (sym->type) {
 288         case S_INT:
 289         case S_HEX:
 290         case S_STRING:
 291                 newval = symbol_empty.curr;
 292                 break;
 293         case S_BOOLEAN:
 294         case S_TRISTATE:
 295                 newval = symbol_no.curr;
 296                 break;
 297         default:
 298                 sym->curr.val = sym->name;
 299                 sym->curr.tri = no;
 300                 return;
 301         }
 302         if (!sym_is_choice_value(sym))
 303                 sym->flags &= ~SYMBOL_WRITE;
 304
 305         sym_calc_visibility(sym);
 306
 307         /* set default if recursively called */
 308         sym->curr = newval;
 309
 310         switch (sym_get_type(sym)) {
 311         case S_BOOLEAN:
 312         case S_TRISTATE:
 313                 if (sym_is_choice_value(sym) && sym->visible == yes) {
 314                         prop = sym_get_choice_prop(sym);
 315                         newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
 316                 } else if (EXPR_OR(sym->visible, sym->rev_dep.tri) != no) {
 317                         sym->flags |= SYMBOL_WRITE;
 318                         if (sym_has_value(sym))
 319                                 newval.tri = sym->def[S_DEF_USER].tri;
 320                         else if (!sym_is_choice(sym)) {
 321                                 prop = sym_get_default_prop(sym);
 322                                 if (prop)
 323                                         newval.tri = expr_calc_value(prop->expr);
 324                         }
 325                         newval.tri = EXPR_OR(EXPR_AND(newval.tri, sym->visible), sym->rev_dep.tri);
 326                 } else if (!sym_is_choice(sym)) {
 327                         prop = sym_get_default_prop(sym);
 328                         if (prop) {
 329                                 sym->flags |= SYMBOL_WRITE;
 330                                 newval.tri = expr_calc_value(prop->expr);
 331                         }
 332                 }
 333                 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
 334                         newval.tri = yes;
 335                 break;
 336         case S_STRING:
 337         case S_HEX:
 338         case S_INT:
 339                 if (sym->visible != no) {
 340                         sym->flags |= SYMBOL_WRITE;
 341                         if (sym_has_value(sym)) {
 342                                 newval.val = sym->def[S_DEF_USER].val;
 343                                 break;
 344                         }
 345                 }
 346                 prop = sym_get_default_prop(sym);
 347                 if (prop) {
 348                         struct symbol *ds = prop_get_symbol(prop);
 349                         if (ds) {
 350                                 sym->flags |= SYMBOL_WRITE;
 351                                 sym_calc_value(ds);
 352                                 newval.val = ds->curr.val;
 353                         }
 354                 }
 355                 break;
 356         default:
 357                 ;
 358         }
 359
 360         if (sym->flags & SYMBOL_AUTO)
 361                 sym->flags &= ~SYMBOL_WRITE;
 362
 363         sym->curr = newval;
 364         if (sym_is_choice(sym) && newval.tri == yes)
 365                 sym->curr.val = sym_calc_choice(sym);
 366         sym_validate_range(sym);
 367
 368         if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
 369                 sym_set_changed(sym);
 370                 if (modules_sym == sym) {
 371                         sym_set_all_changed();
 372                         modules_val = modules_sym->curr.tri;
 373                 }
 374         }
 375
 376         if (sym_is_choice(sym)) {
 377                 struct symbol *choice_sym;
 378                 int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
 379
 380                 prop = sym_get_choice_prop(sym);
 381                 expr_list_for_each_sym(prop->expr, e, choice_sym) {
 382                         choice_sym->flags |= flags;
 383                         if (flags & SYMBOL_CHANGED)
 384                                 sym_set_changed(choice_sym);
 385                 }
 386         }
 387 }
 388
 389 void sym_clear_all_valid(void)
 390 {
 391         struct symbol *sym;
 392         int i;
 393
 394         for_all_symbols(i, sym)
 395                 sym->flags &= ~SYMBOL_VALID;
 396         sym_add_change_count(1);
 397         if (modules_sym)
 398                 sym_calc_value(modules_sym);
 399 }
 400
 401 void sym_set_changed(struct symbol *sym)
 402 {
 403         struct property *prop;
 404
 405         sym->flags |= SYMBOL_CHANGED;
 406         for (prop = sym->prop; prop; prop = prop->next) {
 407                 if (prop->menu)
 408                         prop->menu->flags |= MENU_CHANGED;
 409         }
 410 }
 411
 412 void sym_set_all_changed(void)
 413 {
 414         struct symbol *sym;
 415         int i;
 416
 417         for_all_symbols(i, sym)
 418                 sym_set_changed(sym);
 419 }
 420
 421 bool sym_tristate_within_range(struct symbol *sym, tristate val)
 422 {
 423         int type = sym_get_type(sym);
 424
 425         if (sym->visible == no)
 426                 return false;
 427
 428         if (type != S_BOOLEAN && type != S_TRISTATE)
 429                 return false;
 430
 431         if (type == S_BOOLEAN && val == mod)
 432                 return false;
 433         if (sym->visible <= sym->rev_dep.tri)
 434                 return false;
 435         if (sym_is_choice_value(sym) && sym->visible == yes)
 436                 return val == yes;
 437         return val >= sym->rev_dep.tri && val <= sym->visible;
 438 }
 439
 440 bool sym_set_tristate_value(struct symbol *sym, tristate val)
 441 {
 442         tristate oldval = sym_get_tristate_value(sym);
 443
 444         if (oldval != val && !sym_tristate_within_range(sym, val))
 445                 return false;
 446
 447         if (!(sym->flags & SYMBOL_DEF_USER)) {
 448                 sym->flags |= SYMBOL_DEF_USER;
 449                 sym_set_changed(sym);
 450         }
 451         /*
 452          * setting a choice value also resets the new flag of the choice
 453          * symbol and all other choice values.
 454          */
 455         if (sym_is_choice_value(sym) && val == yes) {
 456                 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 457                 struct property *prop;
 458                 struct expr *e;
 459
 460                 cs->def[S_DEF_USER].val = sym;
 461                 cs->flags |= SYMBOL_DEF_USER;
 462                 prop = sym_get_choice_prop(cs);
 463                 for (e = prop->expr; e; e = e->left.expr) {
 464                         if (e->right.sym->visible != no)
 465                                 e->right.sym->flags |= SYMBOL_DEF_USER;
 466                 }
 467         }
 468
 469         sym->def[S_DEF_USER].tri = val;
 470         if (oldval != val)
 471                 sym_clear_all_valid();
 472
 473         return true;
 474 }
 475
 476 tristate sym_toggle_tristate_value(struct symbol *sym)
 477 {
 478         tristate oldval, newval;
 479
 480         oldval = newval = sym_get_tristate_value(sym);
 481         do {
 482                 switch (newval) {
 483                 case no:
 484                         newval = mod;
 485                         break;
 486                 case mod:
 487                         newval = yes;
 488                         break;
 489                 case yes:
 490                         newval = no;
 491                         break;
 492                 }
 493                 if (sym_set_tristate_value(sym, newval))
 494                         break;
 495         } while (oldval != newval);
 496         return newval;
 497 }
 498
 499 bool sym_string_valid(struct symbol *sym, const char *str)
 500 {
 501         signed char ch;
 502
 503         switch (sym->type) {
 504         case S_STRING:
 505                 return true;
 506         case S_INT:
 507                 ch = *str++;
 508                 if (ch == '-')
 509                         ch = *str++;
 510                 if (!isdigit(ch))
 511                         return false;
 512                 if (ch == '0' && *str != 0)
 513                         return false;
 514                 while ((ch = *str++)) {
 515                         if (!isdigit(ch))
 516                                 return false;
 517                 }
 518                 return true;
 519         case S_HEX:
 520                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 521                         str += 2;
 522                 ch = *str++;
 523                 do {
 524                         if (!isxdigit(ch))
 525                                 return false;
 526                 } while ((ch = *str++));
 527                 return true;
 528         case S_BOOLEAN:
 529         case S_TRISTATE:
 530                 switch (str[0]) {
 531                 case 'y': case 'Y':
 532                 case 'm': case 'M':
 533                 case 'n': case 'N':
 534                         return true;
 535                 }
 536                 return false;
 537         default:
 538                 return false;
 539         }
 540 }
 541
 542 bool sym_string_within_range(struct symbol *sym, const char *str)
 543 {
 544         struct property *prop;
 545         int val;
 546
 547         switch (sym->type) {
 548         case S_STRING:
 549                 return sym_string_valid(sym, str);
 550         case S_INT:
 551                 if (!sym_string_valid(sym, str))
 552                         return false;
 553                 prop = sym_get_range_prop(sym);
 554                 if (!prop)
 555                         return true;
 556                 val = strtol(str, NULL, 10);
 557                 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 558                        val <= sym_get_range_val(prop->expr->right.sym, 10);
 559         case S_HEX:
 560                 if (!sym_string_valid(sym, str))
 561                         return false;
 562                 prop = sym_get_range_prop(sym);
 563                 if (!prop)
 564                         return true;
 565                 val = strtol(str, NULL, 16);
 566                 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 567                        val <= sym_get_range_val(prop->expr->right.sym, 16);
 568         case S_BOOLEAN:
 569         case S_TRISTATE:
 570                 switch (str[0]) {
 571                 case 'y': case 'Y':
 572                         return sym_tristate_within_range(sym, yes);
 573                 case 'm': case 'M':
 574                         return sym_tristate_within_range(sym, mod);
 575                 case 'n': case 'N':
 576                         return sym_tristate_within_range(sym, no);
 577                 }
 578                 return false;
 579         default:
 580                 return false;
 581         }
 582 }
 583
 584 bool sym_set_string_value(struct symbol *sym, const char *newval)
 585 {
 586         const char *oldval;
 587         char *val;
 588         int size;
 589
 590         switch (sym->type) {
 591         case S_BOOLEAN:
 592         case S_TRISTATE:
 593                 switch (newval[0]) {
 594                 case 'y': case 'Y':
 595                         return sym_set_tristate_value(sym, yes);
 596                 case 'm': case 'M':
 597                         return sym_set_tristate_value(sym, mod);
 598                 case 'n': case 'N':
 599                         return sym_set_tristate_value(sym, no);
 600                 }
 601                 return false;
 602         default:
 603                 ;
 604         }
 605
 606         if (!sym_string_within_range(sym, newval))
 607                 return false;
 608
 609         if (!(sym->flags & SYMBOL_DEF_USER)) {
 610                 sym->flags |= SYMBOL_DEF_USER;
 611                 sym_set_changed(sym);
 612         }
 613
 614         oldval = sym->def[S_DEF_USER].val;
 615         size = strlen(newval) + 1;
 616         if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
 617                 size += 2;
 618                 sym->def[S_DEF_USER].val = val = malloc(size);
 619                 *val++ = '0';
 620                 *val++ = 'x';
 621         } else if (!oldval || strcmp(oldval, newval))
 622                 sym->def[S_DEF_USER].val = val = malloc(size);
 623         else
 624                 return true;
 625
 626         strcpy(val, newval);
 627         free((void *)oldval);
 628         sym_clear_all_valid();
 629
 630         return true;
 631 }
 632
 633 const char *sym_get_string_value(struct symbol *sym)
 634 {
 635         tristate val;
 636
 637         switch (sym->type) {
 638         case S_BOOLEAN:
 639         case S_TRISTATE:
 640                 val = sym_get_tristate_value(sym);
 641                 switch (val) {
 642                 case no:
 643                         return "n";
 644                 case mod:
 645                         return "m";
 646                 case yes:
 647                         return "y";
 648                 }
 649                 break;
 650         default:
 651                 ;
 652         }
 653         return (const char *)sym->curr.val;
 654 }
 655
 656 bool sym_is_changable(struct symbol *sym)
 657 {
 658         return sym->visible > sym->rev_dep.tri;
 659 }
 660
 661 struct symbol *sym_lookup(const char *name, int isconst)
 662 {
 663         struct symbol *symbol;
 664         const char *ptr;
 665         char *new_name;
 666         int hash = 0;
 667
 668         if (name) {
 669                 if (name[0] && !name[1]) {
 670                         switch (name[0]) {
 671                         case 'y': return &symbol_yes;
 672                         case 'm': return &symbol_mod;
 673                         case 'n': return &symbol_no;
 674                         }
 675                 }
 676                 for (ptr = name; *ptr; ptr++)
 677                         hash += *ptr;
 678                 hash &= 0xff;
 679
 680                 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 681                         if (!strcmp(symbol->name, name)) {
 682                                 if ((isconst && symbol->flags & SYMBOL_CONST) ||
 683                                     (!isconst && !(symbol->flags & SYMBOL_CONST)))
 684                                         return symbol;
 685                         }
 686                 }
 687                 new_name = strdup(name);
 688         } else {
 689                 new_name = NULL;
 690                 hash = 256;
 691         }
 692
 693         symbol = malloc(sizeof(*symbol));
 694         memset(symbol, 0, sizeof(*symbol));
 695         symbol->name = new_name;
 696         symbol->type = S_UNKNOWN;
 697         if (isconst)
 698                 symbol->flags |= SYMBOL_CONST;
 699
 700         symbol->next = symbol_hash[hash];
 701         symbol_hash[hash] = symbol;
 702
 703         return symbol;
 704 }
 705
 706 struct symbol *sym_find(const char *name)
 707 {
 708         struct symbol *symbol = NULL;
 709         const char *ptr;
 710         int hash = 0;
 711
 712         if (!name)
 713                 return NULL;
 714
 715         if (name[0] && !name[1]) {
 716                 switch (name[0]) {
 717                 case 'y': return &symbol_yes;
 718                 case 'm': return &symbol_mod;
 719                 case 'n': return &symbol_no;
 720                 }
 721         }
 722         for (ptr = name; *ptr; ptr++)
 723                 hash += *ptr;
 724         hash &= 0xff;
 725
 726         for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
 727                 if (!strcmp(symbol->name, name) &&
 728                     !(symbol->flags & SYMBOL_CONST))
 729                                 break;
 730         }
 731
 732         return symbol;
 733 }
 734
 735 struct symbol **sym_re_search(const char *pattern)
 736 {
 737         struct symbol *sym, **sym_arr = NULL;
 738         int i, cnt, size;
 739         regex_t re;
 740
 741         cnt = size = 0;
 742         /* Skip if empty */
 743         if (strlen(pattern) == 0)
 744                 return NULL;
 745         if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
 746                 return NULL;
 747
 748         for_all_symbols(i, sym) {
 749                 if (sym->flags & SYMBOL_CONST || !sym->name)
 750                         continue;
 751                 if (regexec(&re, sym->name, 0, NULL, 0))
 752                         continue;
 753                 if (cnt + 1 >= size) {
 754                         void *tmp = sym_arr;
 755                         size += 16;
 756                         sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
 757                         if (!sym_arr) {
 758                                 free(tmp);
 759                                 return NULL;
 760                         }
 761                 }
 762                 sym_arr[cnt++] = sym;
 763         }
 764         if (sym_arr)
 765                 sym_arr[cnt] = NULL;
 766         regfree(&re);
 767
 768         return sym_arr;
 769 }
 770
 771
 772 struct symbol *sym_check_deps(struct symbol *sym);
 773
 774 static struct symbol *sym_check_expr_deps(struct expr *e)
 775 {
 776         struct symbol *sym;
 777
 778         if (!e)
 779                 return NULL;
 780         switch (e->type) {
 781         case E_OR:
 782         case E_AND:
 783                 sym = sym_check_expr_deps(e->left.expr);
 784                 if (sym)
 785                         return sym;
 786                 return sym_check_expr_deps(e->right.expr);
 787         case E_NOT:
 788                 return sym_check_expr_deps(e->left.expr);
 789         case E_EQUAL:
 790         case E_UNEQUAL:
 791                 sym = sym_check_deps(e->left.sym);
 792                 if (sym)
 793                         return sym;
 794                 return sym_check_deps(e->right.sym);
 795         case E_SYMBOL:
 796                 return sym_check_deps(e->left.sym);
 797         default:
 798                 break;
 799         }
 800         printf("Oops! How to check %d?\n", e->type);
 801         return NULL;
 802 }
 803
 804 /* return NULL when dependencies are OK */
 805 struct symbol *sym_check_deps(struct symbol *sym)
 806 {
 807         struct symbol *sym2;
 808         struct property *prop;
 809
 810         if (sym->flags & SYMBOL_CHECK) {
 811                 fprintf(stderr, "%s:%d:error: found recursive dependency: %s",
 812                         sym->prop->file->name, sym->prop->lineno, sym->name);
 813                 return sym;
 814         }
 815         if (sym->flags & SYMBOL_CHECKED)
 816                 return NULL;
 817
 818         sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
 819         sym2 = sym_check_expr_deps(sym->rev_dep.expr);
 820         if (sym2)
 821                 goto out;
 822
 823         for (prop = sym->prop; prop; prop = prop->next) {
 824                 if (prop->type == P_CHOICE || prop->type == P_SELECT)
 825                         continue;
 826                 sym2 = sym_check_expr_deps(prop->visible.expr);
 827                 if (sym2)
 828                         goto out;
 829                 if (prop->type != P_DEFAULT || sym_is_choice(sym))
 830                         continue;
 831                 sym2 = sym_check_expr_deps(prop->expr);
 832                 if (sym2)
 833                         goto out;
 834         }
 835 out:
 836         if (sym2)
 837                 fprintf(stderr, " -> %s%s", sym->name, sym2 == sym? "\n": "");
 838         sym->flags &= ~SYMBOL_CHECK;
 839         return sym2;
 840 }
 841
 842 struct property *prop_alloc(enum prop_type type, struct symbol *sym)
 843 {
 844         struct property *prop;
 845         struct property **propp;
 846
 847         prop = malloc(sizeof(*prop));
 848         memset(prop, 0, sizeof(*prop));
 849         prop->type = type;
 850         prop->sym = sym;
 851         prop->file = current_file;
 852         prop->lineno = zconf_lineno();
 853
 854         /* append property to the prop list of symbol */
 855         if (sym) {
 856                 for (propp = &sym->prop; *propp; propp = &(*propp)->next)
 857                         ;
 858                 *propp = prop;
 859         }
 860
 861         return prop;
 862 }
 863
 864 struct symbol *prop_get_symbol(struct property *prop)
 865 {
 866         if (prop->expr && (prop->expr->type == E_SYMBOL ||
 867                            prop->expr->type == E_LIST))
 868                 return prop->expr->left.sym;
 869         return NULL;
 870 }
 871
 872 const char *prop_get_type_name(enum prop_type type)
 873 {
 874         switch (type) {
 875         case P_PROMPT:
 876                 return "prompt";
 877         case P_ENV:
 878                 return "env";
 879         case P_COMMENT:
 880                 return "comment";
 881         case P_MENU:
 882                 return "menu";
 883         case P_DEFAULT:
 884                 return "default";
 885         case P_CHOICE:
 886                 return "choice";
 887         case P_SELECT:
 888                 return "select";
 889         case P_RANGE:
 890                 return "range";
 891         case P_UNKNOWN:
 892                 break;
 893         }
 894         return "unknown";
 895 }
 896
 897 void prop_add_env(const char *env)
 898 {
 899         struct symbol *sym, *sym2;
 900         struct property *prop;
 901         char *p;
 902
 903         sym = current_entry->sym;
 904         sym->flags |= SYMBOL_AUTO;
 905         for_all_properties(sym, prop, P_ENV) {
 906                 sym2 = prop_get_symbol(prop);
 907                 if (strcmp(sym2->name, env))
 908                         menu_warn(current_entry, "redefining environment symbol from %s",
 909                                   sym2->name);
 910                 return;
 911         }
 912
 913         prop = prop_alloc(P_ENV, sym);
 914         prop->expr = expr_alloc_symbol(sym_lookup(env, 1));
 915
 916         sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
 917         sym_env_list->right.sym = sym;
 918
 919         p = getenv(env);
 920         if (p)
 921                 sym_add_default(sym, p);
 922         else
 923                 menu_warn(current_entry, "environment variable %s undefined", env);
 924 }