scripts/config/symbol.c

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