scripts/kconfig/menu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   4  */
   5
   6 #include <ctype.h>
   7 #include <stdarg.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #include "lkc.h"
  12
  13 static const char nohelp_text[] = "There is no help available for this option.";
  14
  15 struct menu rootmenu;
  16 static struct menu **last_entry_ptr;
  17
  18 struct file *file_list;
  19 struct file *current_file;
  20
  21 void menu_warn(struct menu *menu, const char *fmt, ...)
  22 {
  23         va_list ap;
  24         va_start(ap, fmt);
  25         fprintf(stderr, "%s:%d:warning: ", menu->file->name, menu->lineno);
  26         vfprintf(stderr, fmt, ap);
  27         fprintf(stderr, "\n");
  28         va_end(ap);
  29 }
  30
  31 static void prop_warn(struct property *prop, const char *fmt, ...)
  32 {
  33         va_list ap;
  34         va_start(ap, fmt);
  35         fprintf(stderr, "%s:%d:warning: ", prop->file->name, prop->lineno);
  36         vfprintf(stderr, fmt, ap);
  37         fprintf(stderr, "\n");
  38         va_end(ap);
  39 }
  40
  41 void _menu_init(void)
  42 {
  43         current_entry = current_menu = &rootmenu;
  44         last_entry_ptr = &rootmenu.list;
  45 }
  46
  47 void menu_add_entry(struct symbol *sym)
  48 {
  49         struct menu *menu;
  50
  51         menu = xmalloc(sizeof(*menu));
  52         memset(menu, 0, sizeof(*menu));
  53         menu->sym = sym;
  54         menu->parent = current_menu;
  55         menu->file = current_file;
  56         menu->lineno = zconf_lineno();
  57
  58         *last_entry_ptr = menu;
  59         last_entry_ptr = &menu->next;
  60         current_entry = menu;
  61         if (sym)
  62                 menu_add_symbol(P_SYMBOL, sym, NULL);
  63 }
  64
  65 struct menu *menu_add_menu(void)
  66 {
  67         last_entry_ptr = &current_entry->list;
  68         return current_menu = current_entry;
  69 }
  70
  71 void menu_end_menu(void)
  72 {
  73         last_entry_ptr = &current_menu->next;
  74         current_menu = current_menu->parent;
  75 }
  76
  77 /*
  78  * Rewrites 'm' to 'm' && MODULES, so that it evaluates to 'n' when running
  79  * without modules
  80  */
  81 static struct expr *rewrite_m(struct expr *e)
  82 {
  83         if (!e)
  84                 return e;
  85
  86         switch (e->type) {
  87         case E_NOT:
  88                 e->left.expr = rewrite_m(e->left.expr);
  89                 break;
  90         case E_OR:
  91         case E_AND:
  92                 e->left.expr = rewrite_m(e->left.expr);
  93                 e->right.expr = rewrite_m(e->right.expr);
  94                 break;
  95         case E_SYMBOL:
  96                 /* change 'm' into 'm' && MODULES */
  97                 if (e->left.sym == &symbol_mod)
  98                         return expr_alloc_and(e, expr_alloc_symbol(modules_sym));
  99                 break;
 100         default:
 101                 break;
 102         }
 103         return e;
 104 }
 105
 106 void menu_add_dep(struct expr *dep)
 107 {
 108         current_entry->dep = expr_alloc_and(current_entry->dep, dep);
 109 }
 110
 111 void menu_set_type(int type)
 112 {
 113         struct symbol *sym = current_entry->sym;
 114
 115         if (sym->type == type)
 116                 return;
 117         if (sym->type == S_UNKNOWN) {
 118                 sym->type = type;
 119                 return;
 120         }
 121         menu_warn(current_entry,
 122                 "ignoring type redefinition of '%s' from '%s' to '%s'",
 123                 sym->name ? sym->name : "<choice>",
 124                 sym_type_name(sym->type), sym_type_name(type));
 125 }
 126
 127 static struct property *menu_add_prop(enum prop_type type, char *prompt, struct expr *expr, struct expr *dep)
 128 {
 129         struct property *prop = prop_alloc(type, current_entry->sym);
 130
 131         prop->menu = current_entry;
 132         prop->expr = expr;
 133         prop->visible.expr = dep;
 134
 135         if (prompt) {
 136                 if (isspace(*prompt)) {
 137                         prop_warn(prop, "leading whitespace ignored");
 138                         while (isspace(*prompt))
 139                                 prompt++;
 140                 }
 141                 if (current_entry->prompt && current_entry != &rootmenu)
 142                         prop_warn(prop, "prompt redefined");
 143
 144                 /* Apply all upper menus' visibilities to actual prompts. */
 145                 if(type == P_PROMPT) {
 146                         struct menu *menu = current_entry;
 147
 148                         while ((menu = menu->parent) != NULL) {
 149                                 struct expr *dup_expr;
 150
 151                                 if (!menu->visibility)
 152                                         continue;
 153                                 /*
 154                                  * Do not add a reference to the
 155                                  * menu's visibility expression but
 156                                  * use a copy of it.  Otherwise the
 157                                  * expression reduction functions
 158                                  * will modify expressions that have
 159                                  * multiple references which can
 160                                  * cause unwanted side effects.
 161                                  */
 162                                 dup_expr = expr_copy(menu->visibility);
 163
 164                                 prop->visible.expr
 165                                         = expr_alloc_and(prop->visible.expr,
 166                                                          dup_expr);
 167                         }
 168                 }
 169
 170                 current_entry->prompt = prop;
 171         }
 172         prop->text = prompt;
 173
 174         return prop;
 175 }
 176
 177 struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep)
 178 {
 179         return menu_add_prop(type, prompt, NULL, dep);
 180 }
 181
 182 void menu_add_visibility(struct expr *expr)
 183 {
 184         current_entry->visibility = expr_alloc_and(current_entry->visibility,
 185             expr);
 186 }
 187
 188 void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep)
 189 {
 190         menu_add_prop(type, NULL, expr, dep);
 191 }
 192
 193 void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep)
 194 {
 195         menu_add_prop(type, NULL, expr_alloc_symbol(sym), dep);
 196 }
 197
 198 void menu_add_option_modules(void)
 199 {
 200         if (modules_sym)
 201                 zconf_error("symbol '%s' redefines option 'modules' already defined by symbol '%s'",
 202                             current_entry->sym->name, modules_sym->name);
 203         modules_sym = current_entry->sym;
 204 }
 205
 206 void menu_add_option_defconfig_list(void)
 207 {
 208         if (!sym_defconfig_list)
 209                 sym_defconfig_list = current_entry->sym;
 210         else if (sym_defconfig_list != current_entry->sym)
 211                 zconf_error("trying to redefine defconfig symbol");
 212         sym_defconfig_list->flags |= SYMBOL_NO_WRITE;
 213 }
 214
 215 void menu_add_option_allnoconfig_y(void)
 216 {
 217         current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
 218 }
 219
 220 static int menu_validate_number(struct symbol *sym, struct symbol *sym2)
 221 {
 222         return sym2->type == S_INT || sym2->type == S_HEX ||
 223                (sym2->type == S_UNKNOWN && sym_string_valid(sym, sym2->name));
 224 }
 225
 226 static void sym_check_prop(struct symbol *sym)
 227 {
 228         struct property *prop;
 229         struct symbol *sym2;
 230         char *use;
 231
 232         for (prop = sym->prop; prop; prop = prop->next) {
 233                 switch (prop->type) {
 234                 case P_DEFAULT:
 235                         if ((sym->type == S_STRING || sym->type == S_INT || sym->type == S_HEX) &&
 236                             prop->expr->type != E_SYMBOL)
 237                                 prop_warn(prop,
 238                                     "default for config symbol '%s'"
 239                                     " must be a single symbol", sym->name);
 240                         if (prop->expr->type != E_SYMBOL)
 241                                 break;
 242                         sym2 = prop_get_symbol(prop);
 243                         if (sym->type == S_HEX || sym->type == S_INT) {
 244                                 if (!menu_validate_number(sym, sym2))
 245                                         prop_warn(prop,
 246                                             "'%s': number is invalid",
 247                                             sym->name);
 248                         }
 249                         if (sym_is_choice(sym)) {
 250                                 struct property *choice_prop =
 251                                         sym_get_choice_prop(sym2);
 252
 253                                 if (!choice_prop ||
 254                                     prop_get_symbol(choice_prop) != sym)
 255                                         prop_warn(prop,
 256                                                   "choice default symbol '%s' is not contained in the choice",
 257                                                   sym2->name);
 258                         }
 259                         break;
 260                 case P_SELECT:
 261                 case P_IMPLY:
 262                         use = prop->type == P_SELECT ? "select" : "imply";
 263                         sym2 = prop_get_symbol(prop);
 264                         if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE)
 265                                 prop_warn(prop,
 266                                     "config symbol '%s' uses %s, but is "
 267                                     "not bool or tristate", sym->name, use);
 268                         else if (sym2->type != S_UNKNOWN &&
 269                                  sym2->type != S_BOOLEAN &&
 270                                  sym2->type != S_TRISTATE)
 271                                 prop_warn(prop,
 272                                     "'%s' has wrong type. '%s' only "
 273                                     "accept arguments of bool and "
 274                                     "tristate type", sym2->name, use);
 275                         break;
 276                 case P_RANGE:
 277                         if (sym->type != S_INT && sym->type != S_HEX)
 278                                 prop_warn(prop, "range is only allowed "
 279                                                 "for int or hex symbols");
 280                         if (!menu_validate_number(sym, prop->expr->left.sym) ||
 281                             !menu_validate_number(sym, prop->expr->right.sym))
 282                                 prop_warn(prop, "range is invalid");
 283                         break;
 284                 default:
 285                         ;
 286                 }
 287         }
 288 }
 289
 290 void menu_finalize(struct menu *parent)
 291 {
 292         struct menu *menu, *last_menu;
 293         struct symbol *sym;
 294         struct property *prop;
 295         struct expr *parentdep, *basedep, *dep, *dep2, **ep;
 296
 297         sym = parent->sym;
 298         if (parent->list) {
 299                 /*
 300                  * This menu node has children. We (recursively) process them
 301                  * and propagate parent dependencies before moving on.
 302                  */
 303
 304                 if (sym && sym_is_choice(sym)) {
 305                         if (sym->type == S_UNKNOWN) {
 306                                 /* find the first choice value to find out choice type */
 307                                 current_entry = parent;
 308                                 for (menu = parent->list; menu; menu = menu->next) {
 309                                         if (menu->sym && menu->sym->type != S_UNKNOWN) {
 310                                                 menu_set_type(menu->sym->type);
 311                                                 break;
 312                                         }
 313                                 }
 314                         }
 315                         /* set the type of the remaining choice values */
 316                         for (menu = parent->list; menu; menu = menu->next) {
 317                                 current_entry = menu;
 318                                 if (menu->sym && menu->sym->type == S_UNKNOWN)
 319                                         menu_set_type(sym->type);
 320                         }
 321
 322                         /*
 323                          * Use the choice itself as the parent dependency of
 324                          * the contained items. This turns the mode of the
 325                          * choice into an upper bound on the visibility of the
 326                          * choice value symbols.
 327                          */
 328                         parentdep = expr_alloc_symbol(sym);
 329                 } else if (parent->prompt)
 330                         /* Menu node for 'menu' */
 331                         parentdep = parent->prompt->visible.expr;
 332                 else
 333                         /* Menu node for 'if' */
 334                         parentdep = parent->dep;
 335
 336                 /* For each child menu node... */
 337                 for (menu = parent->list; menu; menu = menu->next) {
 338                         /*
 339                          * Propagate parent dependencies to the child menu
 340                          * node, also rewriting and simplifying expressions
 341                          */
 342                         basedep = rewrite_m(menu->dep);
 343                         basedep = expr_transform(basedep);
 344                         basedep = expr_alloc_and(expr_copy(parentdep), basedep);
 345                         basedep = expr_eliminate_dups(basedep);
 346                         menu->dep = basedep;
 347
 348                         if (menu->sym)
 349                                 /*
 350                                  * Note: For symbols, all prompts are included
 351                                  * too in the symbol's own property list
 352                                  */
 353                                 prop = menu->sym->prop;
 354                         else
 355                                 /*
 356                                  * For non-symbol menu nodes, we just need to
 357                                  * handle the prompt
 358                                  */
 359                                 prop = menu->prompt;
 360
 361                         /* For each property... */
 362                         for (; prop; prop = prop->next) {
 363                                 if (prop->menu != menu)
 364                                         /*
 365                                          * Two possibilities:
 366                                          *
 367                                          * 1. The property lacks dependencies
 368                                          *    and so isn't location-specific,
 369                                          *    e.g. an 'option'
 370                                          *
 371                                          * 2. The property belongs to a symbol
 372                                          *    defined in multiple locations and
 373                                          *    is from some other location. It
 374                                          *    will be handled there in that
 375                                          *    case.
 376                                          *
 377                                          * Skip the property.
 378                                          */
 379                                         continue;
 380
 381                                 /*
 382                                  * Propagate parent dependencies to the
 383                                  * property's condition, rewriting and
 384                                  * simplifying expressions at the same time
 385                                  */
 386                                 dep = rewrite_m(prop->visible.expr);
 387                                 dep = expr_transform(dep);
 388                                 dep = expr_alloc_and(expr_copy(basedep), dep);
 389                                 dep = expr_eliminate_dups(dep);
 390                                 if (menu->sym && menu->sym->type != S_TRISTATE)
 391                                         dep = expr_trans_bool(dep);
 392                                 prop->visible.expr = dep;
 393
 394                                 /*
 395                                  * Handle selects and implies, which modify the
 396                                  * dependencies of the selected/implied symbol
 397                                  */
 398                                 if (prop->type == P_SELECT) {
 399                                         struct symbol *es = prop_get_symbol(prop);
 400                                         es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
 401                                                         expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
 402                                 } else if (prop->type == P_IMPLY) {
 403                                         struct symbol *es = prop_get_symbol(prop);
 404                                         es->implied.expr = expr_alloc_or(es->implied.expr,
 405                                                         expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
 406                                 }
 407                         }
 408                 }
 409
 410                 if (sym && sym_is_choice(sym))
 411                         expr_free(parentdep);
 412
 413                 /*
 414                  * Recursively process children in the same fashion before
 415                  * moving on
 416                  */
 417                 for (menu = parent->list; menu; menu = menu->next)
 418                         menu_finalize(menu);
 419         } else if (sym) {
 420                 /*
 421                  * Automatic submenu creation. If sym is a symbol and A, B, C,
 422                  * ... are consecutive items (symbols, menus, ifs, etc.) that
 423                  * all depend on sym, then the following menu structure is
 424                  * created:
 425                  *
 426                  *      sym
 427                  *       +-A
 428                  *       +-B
 429                  *       +-C
 430                  *       ...
 431                  *
 432                  * This also works recursively, giving the following structure
 433                  * if A is a symbol and B depends on A:
 434                  *
 435                  *      sym
 436                  *       +-A
 437                  *       | +-B
 438                  *       +-C
 439                  *       ...
 440                  */
 441
 442                 basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
 443                 basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
 444                 basedep = expr_eliminate_dups(expr_transform(basedep));
 445
 446                 /* Examine consecutive elements after sym */
 447                 last_menu = NULL;
 448                 for (menu = parent->next; menu; menu = menu->next) {
 449                         dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
 450                         if (!expr_contains_symbol(dep, sym))
 451                                 /* No dependency, quit */
 452                                 break;
 453                         if (expr_depends_symbol(dep, sym))
 454                                 /* Absolute dependency, put in submenu */
 455                                 goto next;
 456
 457                         /*
 458                          * Also consider it a dependency on sym if our
 459                          * dependencies contain sym and are a "superset" of
 460                          * sym's dependencies, e.g. '(sym || Q) && R' when sym
 461                          * depends on R.
 462                          *
 463                          * Note that 'R' might be from an enclosing menu or if,
 464                          * making this a more common case than it might seem.
 465                          */
 466                         dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
 467                         dep = expr_eliminate_dups(expr_transform(dep));
 468                         dep2 = expr_copy(basedep);
 469                         expr_eliminate_eq(&dep, &dep2);
 470                         expr_free(dep);
 471                         if (!expr_is_yes(dep2)) {
 472                                 /* Not superset, quit */
 473                                 expr_free(dep2);
 474                                 break;
 475                         }
 476                         /* Superset, put in submenu */
 477                         expr_free(dep2);
 478                 next:
 479                         menu_finalize(menu);
 480                         menu->parent = parent;
 481                         last_menu = menu;
 482                 }
 483                 expr_free(basedep);
 484                 if (last_menu) {
 485                         parent->list = parent->next;
 486                         parent->next = last_menu->next;
 487                         last_menu->next = NULL;
 488                 }
 489
 490                 sym->dir_dep.expr = expr_alloc_or(sym->dir_dep.expr, parent->dep);
 491         }
 492         for (menu = parent->list; menu; menu = menu->next) {
 493                 if (sym && sym_is_choice(sym) &&
 494                     menu->sym && !sym_is_choice_value(menu->sym)) {
 495                         current_entry = menu;
 496                         menu->sym->flags |= SYMBOL_CHOICEVAL;
 497                         if (!menu->prompt)
 498                                 menu_warn(menu, "choice value must have a prompt");
 499                         for (prop = menu->sym->prop; prop; prop = prop->next) {
 500                                 if (prop->type == P_DEFAULT)
 501                                         prop_warn(prop, "defaults for choice "
 502                                                   "values not supported");
 503                                 if (prop->menu == menu)
 504                                         continue;
 505                                 if (prop->type == P_PROMPT &&
 506                                     prop->menu->parent->sym != sym)
 507                                         prop_warn(prop, "choice value used outside its choice group");
 508                         }
 509                         /* Non-tristate choice values of tristate choices must
 510                          * depend on the choice being set to Y. The choice
 511                          * values' dependencies were propagated to their
 512                          * properties above, so the change here must be re-
 513                          * propagated.
 514                          */
 515                         if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
 516                                 basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
 517                                 menu->dep = expr_alloc_and(basedep, menu->dep);
 518                                 for (prop = menu->sym->prop; prop; prop = prop->next) {
 519                                         if (prop->menu != menu)
 520                                                 continue;
 521                                         prop->visible.expr = expr_alloc_and(expr_copy(basedep),
 522                                                                             prop->visible.expr);
 523                                 }
 524                         }
 525                         menu_add_symbol(P_CHOICE, sym, NULL);
 526                         prop = sym_get_choice_prop(sym);
 527                         for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
 528                                 ;
 529                         *ep = expr_alloc_one(E_LIST, NULL);
 530                         (*ep)->right.sym = menu->sym;
 531                 }
 532
 533                 /*
 534                  * This code serves two purposes:
 535                  *
 536                  * (1) Flattening 'if' blocks, which do not specify a submenu
 537                  *     and only add dependencies.
 538                  *
 539                  *     (Automatic submenu creation might still create a submenu
 540                  *     from an 'if' before this code runs.)
 541                  *
 542                  * (2) "Undoing" any automatic submenus created earlier below
 543                  *     promptless symbols.
 544                  *
 545                  * Before:
 546                  *
 547                  *      A
 548                  *      if ... (or promptless symbol)
 549                  *       +-B
 550                  *       +-C
 551                  *      D
 552                  *
 553                  * After:
 554                  *
 555                  *      A
 556                  *      if ... (or promptless symbol)
 557                  *      B
 558                  *      C
 559                  *      D
 560                  */
 561                 if (menu->list && (!menu->prompt || !menu->prompt->text)) {
 562                         for (last_menu = menu->list; ; last_menu = last_menu->next) {
 563                                 last_menu->parent = parent;
 564                                 if (!last_menu->next)
 565                                         break;
 566                         }
 567                         last_menu->next = menu->next;
 568                         menu->next = menu->list;
 569                         menu->list = NULL;
 570                 }
 571         }
 572
 573         if (sym && !(sym->flags & SYMBOL_WARNED)) {
 574                 if (sym->type == S_UNKNOWN)
 575                         menu_warn(parent, "config symbol defined without type");
 576
 577                 if (sym_is_choice(sym) && !parent->prompt)
 578                         menu_warn(parent, "choice must have a prompt");
 579
 580                 /* Check properties connected to this symbol */
 581                 sym_check_prop(sym);
 582                 sym->flags |= SYMBOL_WARNED;
 583         }
 584
 585         /*
 586          * For non-optional choices, add a reverse dependency (corresponding to
 587          * a select) of '<visibility> && m'. This prevents the user from
 588          * setting the choice mode to 'n' when the choice is visible.
 589          *
 590          * This would also work for non-choice symbols, but only non-optional
 591          * choices clear SYMBOL_OPTIONAL as of writing. Choices are implemented
 592          * as a type of symbol.
 593          */
 594         if (sym && !sym_is_optional(sym) && parent->prompt) {
 595                 sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
 596                                 expr_alloc_and(parent->prompt->visible.expr,
 597                                         expr_alloc_symbol(&symbol_mod)));
 598         }
 599 }
 600
 601 bool menu_has_prompt(struct menu *menu)
 602 {
 603         if (!menu->prompt)
 604                 return false;
 605         return true;
 606 }
 607
 608 /*
 609  * Determine if a menu is empty.
 610  * A menu is considered empty if it contains no or only
 611  * invisible entries.
 612  */
 613 bool menu_is_empty(struct menu *menu)
 614 {
 615         struct menu *child;
 616
 617         for (child = menu->list; child; child = child->next) {
 618                 if (menu_is_visible(child))
 619                         return(false);
 620         }
 621         return(true);
 622 }
 623
 624 bool menu_is_visible(struct menu *menu)
 625 {
 626         struct menu *child;
 627         struct symbol *sym;
 628         tristate visible;
 629
 630         if (!menu->prompt)
 631                 return false;
 632
 633         if (menu->visibility) {
 634                 if (expr_calc_value(menu->visibility) == no)
 635                         return false;
 636         }
 637
 638         sym = menu->sym;
 639         if (sym) {
 640                 sym_calc_value(sym);
 641                 visible = menu->prompt->visible.tri;
 642         } else
 643                 visible = menu->prompt->visible.tri = expr_calc_value(menu->prompt->visible.expr);
 644
 645         if (visible != no)
 646                 return true;
 647
 648         if (!sym || sym_get_tristate_value(menu->sym) == no)
 649                 return false;
 650
 651         for (child = menu->list; child; child = child->next) {
 652                 if (menu_is_visible(child)) {
 653                         if (sym)
 654                                 sym->flags |= SYMBOL_DEF_USER;
 655                         return true;
 656                 }
 657         }
 658
 659         return false;
 660 }
 661
 662 const char *menu_get_prompt(struct menu *menu)
 663 {
 664         if (menu->prompt)
 665                 return menu->prompt->text;
 666         else if (menu->sym)
 667                 return menu->sym->name;
 668         return NULL;
 669 }
 670
 671 struct menu *menu_get_root_menu(struct menu *menu)
 672 {
 673         return &rootmenu;
 674 }
 675
 676 struct menu *menu_get_parent_menu(struct menu *menu)
 677 {
 678         enum prop_type type;
 679
 680         for (; menu != &rootmenu; menu = menu->parent) {
 681                 type = menu->prompt ? menu->prompt->type : 0;
 682                 if (type == P_MENU)
 683                         break;
 684         }
 685         return menu;
 686 }
 687
 688 bool menu_has_help(struct menu *menu)
 689 {
 690         return menu->help != NULL;
 691 }
 692
 693 const char *menu_get_help(struct menu *menu)
 694 {
 695         if (menu->help)
 696                 return menu->help;
 697         else
 698                 return "";
 699 }
 700
 701 static void get_prompt_str(struct gstr *r, struct property *prop,
 702                            struct list_head *head)
 703 {
 704         int i, j;
 705         struct menu *submenu[8], *menu, *location = NULL;
 706         struct jump_key *jump = NULL;
 707
 708         str_printf(r, "Prompt: %s\n", prop->text);
 709         menu = prop->menu->parent;
 710         for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
 711                 bool accessible = menu_is_visible(menu);
 712
 713                 submenu[i++] = menu;
 714                 if (location == NULL && accessible)
 715                         location = menu;
 716         }
 717         if (head && location) {
 718                 jump = xmalloc(sizeof(struct jump_key));
 719
 720                 if (menu_is_visible(prop->menu)) {
 721                         /*
 722                          * There is not enough room to put the hint at the
 723                          * beginning of the "Prompt" line. Put the hint on the
 724                          * last "Location" line even when it would belong on
 725                          * the former.
 726                          */
 727                         jump->target = prop->menu;
 728                 } else
 729                         jump->target = location;
 730
 731                 if (list_empty(head))
 732                         jump->index = 0;
 733                 else
 734                         jump->index = list_entry(head->prev, struct jump_key,
 735                                                  entries)->index + 1;
 736
 737                 list_add_tail(&jump->entries, head);
 738         }
 739
 740         if (i > 0) {
 741                 str_printf(r, "  Location:\n");
 742                 for (j = 4; --i >= 0; j += 2) {
 743                         menu = submenu[i];
 744                         if (jump && menu == location)
 745                                 jump->offset = strlen(r->s);
 746                         str_printf(r, "%*c-> %s", j, ' ',
 747                                    menu_get_prompt(menu));
 748                         if (menu->sym) {
 749                                 str_printf(r, " (%s [=%s])", menu->sym->name ?
 750                                         menu->sym->name : "<choice>",
 751                                         sym_get_string_value(menu->sym));
 752                         }
 753                         str_append(r, "\n");
 754                 }
 755         }
 756 }
 757
 758 /*
 759  * get property of type P_SYMBOL
 760  */
 761 static struct property *get_symbol_prop(struct symbol *sym)
 762 {
 763         struct property *prop = NULL;
 764
 765         for_all_properties(sym, prop, P_SYMBOL)
 766                 break;
 767         return prop;
 768 }
 769
 770 static void get_symbol_props_str(struct gstr *r, struct symbol *sym,
 771                                  enum prop_type tok, const char *prefix)
 772 {
 773         bool hit = false;
 774         struct property *prop;
 775
 776         for_all_properties(sym, prop, tok) {
 777                 if (!hit) {
 778                         str_append(r, prefix);
 779                         hit = true;
 780                 } else
 781                         str_printf(r, " && ");
 782                 expr_gstr_print(prop->expr, r);
 783         }
 784         if (hit)
 785                 str_append(r, "\n");
 786 }
 787
 788 /*
 789  * head is optional and may be NULL
 790  */
 791 static void get_symbol_str(struct gstr *r, struct symbol *sym,
 792                     struct list_head *head)
 793 {
 794         struct property *prop;
 795
 796         if (sym && sym->name) {
 797                 str_printf(r, "Symbol: %s [=%s]\n", sym->name,
 798                            sym_get_string_value(sym));
 799                 str_printf(r, "Type  : %s\n", sym_type_name(sym->type));
 800                 if (sym->type == S_INT || sym->type == S_HEX) {
 801                         prop = sym_get_range_prop(sym);
 802                         if (prop) {
 803                                 str_printf(r, "Range : ");
 804                                 expr_gstr_print(prop->expr, r);
 805                                 str_append(r, "\n");
 806                         }
 807                 }
 808         }
 809         for_all_prompts(sym, prop)
 810                 get_prompt_str(r, prop, head);
 811
 812         prop = get_symbol_prop(sym);
 813         if (prop) {
 814                 str_printf(r, "  Defined at %s:%d\n", prop->menu->file->name,
 815                         prop->menu->lineno);
 816                 if (!expr_is_yes(prop->visible.expr)) {
 817                         str_append(r, "  Depends on: ");
 818                         expr_gstr_print(prop->visible.expr, r);
 819                         str_append(r, "\n");
 820                 }
 821         }
 822
 823         get_symbol_props_str(r, sym, P_SELECT, "  Selects: ");
 824         if (sym->rev_dep.expr) {
 825                 expr_gstr_print_revdep(sym->rev_dep.expr, r, yes, "  Selected by [y]:\n");
 826                 expr_gstr_print_revdep(sym->rev_dep.expr, r, mod, "  Selected by [m]:\n");
 827                 expr_gstr_print_revdep(sym->rev_dep.expr, r, no, "  Selected by [n]:\n");
 828         }
 829
 830         get_symbol_props_str(r, sym, P_IMPLY, "  Implies: ");
 831         if (sym->implied.expr) {
 832                 expr_gstr_print_revdep(sym->implied.expr, r, yes, "  Implied by [y]:\n");
 833                 expr_gstr_print_revdep(sym->implied.expr, r, mod, "  Implied by [m]:\n");
 834                 expr_gstr_print_revdep(sym->implied.expr, r, no, "  Implied by [n]:\n");
 835         }
 836
 837         str_append(r, "\n\n");
 838 }
 839
 840 struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head)
 841 {
 842         struct symbol *sym;
 843         struct gstr res = str_new();
 844         int i;
 845
 846         for (i = 0; sym_arr && (sym = sym_arr[i]); i++)
 847                 get_symbol_str(&res, sym, head);
 848         if (!i)
 849                 str_append(&res, "No matches found.\n");
 850         return res;
 851 }
 852
 853
 854 void menu_get_ext_help(struct menu *menu, struct gstr *help)
 855 {
 856         struct symbol *sym = menu->sym;
 857         const char *help_text = nohelp_text;
 858
 859         if (menu_has_help(menu)) {
 860                 if (sym->name)
 861                         str_printf(help, "%s%s:\n\n", CONFIG_, sym->name);
 862                 help_text = menu_get_help(menu);
 863         }
 864         str_printf(help, "%s\n", help_text);
 865         if (sym)
 866                 get_symbol_str(help, sym, NULL);
 867 }