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