scripts/kconfig/menu.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <ctype.h>
   7 #include <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(int token, char *arg)
 199 {
 200         switch (token) {
 201         case T_OPT_MODULES:
 202                 if (modules_sym)
 203                         zconf_error("symbol '%s' redefines option 'modules'"
 204                                     " already defined by symbol '%s'",
 205                                     current_entry->sym->name,
 206                                     modules_sym->name
 207                                     );
 208                 modules_sym = current_entry->sym;
 209                 break;
 210         case T_OPT_DEFCONFIG_LIST:
 211                 if (!sym_defconfig_list)
 212                         sym_defconfig_list = current_entry->sym;
 213                 else if (sym_defconfig_list != current_entry->sym)
 214                         zconf_error("trying to redefine defconfig symbol");
 215                 sym_defconfig_list->flags |= SYMBOL_NO_WRITE;
 216                 break;
 217         case T_OPT_ALLNOCONFIG_Y:
 218                 current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
 219                 break;
 220         }
 221 }
 222
 223 static int menu_validate_number(struct symbol *sym, struct symbol *sym2)
 224 {
 225         return sym2->type == S_INT || sym2->type == S_HEX ||
 226                (sym2->type == S_UNKNOWN && sym_string_valid(sym, sym2->name));
 227 }
 228
 229 static void sym_check_prop(struct symbol *sym)
 230 {
 231         struct property *prop;
 232         struct symbol *sym2;
 233         char *use;
 234
 235         for (prop = sym->prop; prop; prop = prop->next) {
 236                 switch (prop->type) {
 237                 case P_DEFAULT:
 238                         if ((sym->type == S_STRING || sym->type == S_INT || sym->type == S_HEX) &&
 239                             prop->expr->type != E_SYMBOL)
 240                                 prop_warn(prop,
 241                                     "default for config symbol '%s'"
 242                                     " must be a single symbol", sym->name);
 243                         if (prop->expr->type != E_SYMBOL)
 244                                 break;
 245                         sym2 = prop_get_symbol(prop);
 246                         if (sym->type == S_HEX || sym->type == S_INT) {
 247                                 if (!menu_validate_number(sym, sym2))
 248                                         prop_warn(prop,
 249                                             "'%s': number is invalid",
 250                                             sym->name);
 251                         }
 252                         if (sym_is_choice(sym)) {
 253                                 struct property *choice_prop =
 254                                         sym_get_choice_prop(sym2);
 255
 256                                 if (!choice_prop ||
 257                                     prop_get_symbol(choice_prop) != sym)
 258                                         prop_warn(prop,
 259                                                   "choice default symbol '%s' is not contained in the choice",
 260                                                   sym2->name);
 261                         }
 262                         break;
 263                 case P_SELECT:
 264                 case P_IMPLY:
 265                         use = prop->type == P_SELECT ? "select" : "imply";
 266                         sym2 = prop_get_symbol(prop);
 267                         if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE)
 268                                 prop_warn(prop,
 269                                     "config symbol '%s' uses %s, but is "
 270                                     "not bool or tristate", sym->name, use);
 271                         else if (sym2->type != S_UNKNOWN &&
 272                                  sym2->type != S_BOOLEAN &&
 273                                  sym2->type != S_TRISTATE)
 274                                 prop_warn(prop,
 275                                     "'%s' has wrong type. '%s' only "
 276                                     "accept arguments of bool and "
 277                                     "tristate type", sym2->name, use);
 278                         break;
 279                 case P_RANGE:
 280                         if (sym->type != S_INT && sym->type != S_HEX)
 281                                 prop_warn(prop, "range is only allowed "
 282                                                 "for int or hex symbols");
 283                         if (!menu_validate_number(sym, prop->expr->left.sym) ||
 284                             !menu_validate_number(sym, prop->expr->right.sym))
 285                                 prop_warn(prop, "range is invalid");
 286                         break;
 287                 default:
 288                         ;
 289                 }
 290         }
 291 }
 292
 293 void menu_finalize(struct menu *parent)
 294 {
 295         struct menu *menu, *last_menu;
 296         struct symbol *sym;
 297         struct property *prop;
 298         struct expr *parentdep, *basedep, *dep, *dep2, **ep;
 299
 300         sym = parent->sym;
 301         if (parent->list) {
 302                 /*
 303                  * This menu node has children. We (recursively) process them
 304                  * and propagate parent dependencies before moving on.
 305                  */
 306
 307                 if (sym && sym_is_choice(sym)) {
 308                         if (sym->type == S_UNKNOWN) {
 309                                 /* find the first choice value to find out choice type */
 310                                 current_entry = parent;
 311                                 for (menu = parent->list; menu; menu = menu->next) {
 312                                         if (menu->sym && menu->sym->type != S_UNKNOWN) {
 313                                                 menu_set_type(menu->sym->type);
 314                                                 break;
 315                                         }
 316                                 }
 317                         }
 318                         /* set the type of the remaining choice values */
 319                         for (menu = parent->list; menu; menu = menu->next) {
 320                                 current_entry = menu;
 321                                 if (menu->sym && menu->sym->type == S_UNKNOWN)
 322                                         menu_set_type(sym->type);
 323                         }
 324
 325                         /*
 326                          * Use the choice itself as the parent dependency of
 327                          * the contained items. This turns the mode of the
 328                          * choice into an upper bound on the visibility of the
 329                          * choice value symbols.
 330                          */
 331                         parentdep = expr_alloc_symbol(sym);
 332                 } else if (parent->prompt)
 333                         /* Menu node for 'menu' */
 334                         parentdep = parent->prompt->visible.expr;
 335                 else
 336                         /* Menu node for 'if' */
 337                         parentdep = parent->dep;
 338
 339                 /* For each child menu node... */
 340                 for (menu = parent->list; menu; menu = menu->next) {
 341                         /*
 342                          * Propagate parent dependencies to the child menu
 343                          * node, also rewriting and simplifying expressions
 344                          */
 345                         basedep = rewrite_m(menu->dep);
 346                         basedep = expr_transform(basedep);
 347                         basedep = expr_alloc_and(expr_copy(parentdep), basedep);
 348                         basedep = expr_eliminate_dups(basedep);
 349                         menu->dep = basedep;
 350
 351                         if (menu->sym)
 352                                 /*
 353                                  * Note: For symbols, all prompts are included
 354                                  * too in the symbol's own property list
 355                                  */
 356                                 prop = menu->sym->prop;
 357                         else
 358                                 /*
 359                                  * For non-symbol menu nodes, we just need to
 360                                  * handle the prompt
 361                                  */
 362                                 prop = menu->prompt;
 363
 364                         /* For each property... */
 365                         for (; prop; prop = prop->next) {
 366                                 if (prop->menu != menu)
 367                                         /*
 368                                          * Two possibilities:
 369                                          *
 370                                          * 1. The property lacks dependencies
 371                                          *    and so isn't location-specific,
 372                                          *    e.g. an 'option'
 373                                          *
 374                                          * 2. The property belongs to a symbol
 375                                          *    defined in multiple locations and
 376                                          *    is from some other location. It
 377                                          *    will be handled there in that
 378                                          *    case.
 379                                          *
 380                                          * Skip the property.
 381                                          */
 382                                         continue;
 383
 384                                 /*
 385                                  * Propagate parent dependencies to the
 386                                  * property's condition, rewriting and
 387                                  * simplifying expressions at the same time
 388                                  */
 389                                 dep = rewrite_m(prop->visible.expr);
 390                                 dep = expr_transform(dep);
 391                                 dep = expr_alloc_and(expr_copy(basedep), dep);
 392                                 dep = expr_eliminate_dups(dep);
 393                                 if (menu->sym && menu->sym->type != S_TRISTATE)
 394                                         dep = expr_trans_bool(dep);
 395                                 prop->visible.expr = dep;
 396
 397                                 /*
 398                                  * Handle selects and implies, which modify the
 399                                  * dependencies of the selected/implied symbol
 400                                  */
 401                                 if (prop->type == P_SELECT) {
 402                                         struct symbol *es = prop_get_symbol(prop);
 403                                         es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
 404                                                         expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
 405                                 } else if (prop->type == P_IMPLY) {
 406                                         struct symbol *es = prop_get_symbol(prop);
 407                                         es->implied.expr = expr_alloc_or(es->implied.expr,
 408                                                         expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
 409                                 }
 410                         }
 411                 }
 412
 413                 if (sym && sym_is_choice(sym))
 414                         expr_free(parentdep);
 415
 416                 /*
 417                  * Recursively process children in the same fashion before
 418                  * moving on
 419                  */
 420                 for (menu = parent->list; menu; menu = menu->next)
 421                         menu_finalize(menu);
 422         } else if (sym) {
 423                 /*
 424                  * Automatic submenu creation. If sym is a symbol and A, B, C,
 425                  * ... are consecutive items (symbols, menus, ifs, etc.) that
 426                  * all depend on sym, then the following menu structure is
 427                  * created:
 428                  *
 429                  *      sym
 430                  *       +-A
 431                  *       +-B
 432                  *       +-C
 433                  *       ...
 434                  *
 435                  * This also works recursively, giving the following structure
 436                  * if A is a symbol and B depends on A:
 437                  *
 438                  *      sym
 439                  *       +-A
 440                  *       | +-B
 441                  *       +-C
 442                  *       ...
 443                  */
 444
 445                 basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
 446                 basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
 447                 basedep = expr_eliminate_dups(expr_transform(basedep));
 448
 449                 /* Examine consecutive elements after sym */
 450                 last_menu = NULL;
 451                 for (menu = parent->next; menu; menu = menu->next) {
 452                         dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
 453                         if (!expr_contains_symbol(dep, sym))
 454                                 /* No dependency, quit */
 455                                 break;
 456                         if (expr_depends_symbol(dep, sym))
 457                                 /* Absolute dependency, put in submenu */
 458                                 goto next;
 459
 460                         /*
 461                          * Also consider it a dependency on sym if our
 462                          * dependencies contain sym and are a "superset" of
 463                          * sym's dependencies, e.g. '(sym || Q) && R' when sym
 464                          * depends on R.
 465                          *
 466                          * Note that 'R' might be from an enclosing menu or if,
 467                          * making this a more common case than it might seem.
 468                          */
 469                         dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
 470                         dep = expr_eliminate_dups(expr_transform(dep));
 471                         dep2 = expr_copy(basedep);
 472                         expr_eliminate_eq(&dep, &dep2);
 473                         expr_free(dep);
 474                         if (!expr_is_yes(dep2)) {
 475                                 /* Not superset, quit */
 476                                 expr_free(dep2);
 477                                 break;
 478                         }
 479                         /* Superset, put in submenu */
 480                         expr_free(dep2);
 481                 next:
 482                         menu_finalize(menu);
 483                         menu->parent = parent;
 484                         last_menu = menu;
 485                 }
 486                 expr_free(basedep);
 487                 if (last_menu) {
 488                         parent->list = parent->next;
 489                         parent->next = last_menu->next;
 490                         last_menu->next = NULL;
 491                 }
 492
 493                 sym->dir_dep.expr = expr_alloc_or(sym->dir_dep.expr, parent->dep);
 494         }
 495         for (menu = parent->list; menu; menu = menu->next) {
 496                 if (sym && sym_is_choice(sym) &&
 497                     menu->sym && !sym_is_choice_value(menu->sym)) {
 498                         current_entry = menu;
 499                         menu->sym->flags |= SYMBOL_CHOICEVAL;
 500                         if (!menu->prompt)
 501                                 menu_warn(menu, "choice value must have a prompt");
 502                         for (prop = menu->sym->prop; prop; prop = prop->next) {
 503                                 if (prop->type == P_DEFAULT)
 504                                         prop_warn(prop, "defaults for choice "
 505                                                   "values not supported");
 506                                 if (prop->menu == menu)
 507                                         continue;
 508                                 if (prop->type == P_PROMPT &&
 509                                     prop->menu->parent->sym != sym)
 510                                         prop_warn(prop, "choice value used outside its choice group");
 511                         }
 512                         /* Non-tristate choice values of tristate choices must
 513                          * depend on the choice being set to Y. The choice
 514                          * values' dependencies were propagated to their
 515                          * properties above, so the change here must be re-
 516                          * propagated.
 517                          */
 518                         if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
 519                                 basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
 520                                 menu->dep = expr_alloc_and(basedep, menu->dep);
 521                                 for (prop = menu->sym->prop; prop; prop = prop->next) {
 522                                         if (prop->menu != menu)
 523                                                 continue;
 524                                         prop->visible.expr = expr_alloc_and(expr_copy(basedep),
 525                                                                             prop->visible.expr);
 526                                 }
 527                         }
 528                         menu_add_symbol(P_CHOICE, sym, NULL);
 529                         prop = sym_get_choice_prop(sym);
 530                         for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
 531                                 ;
 532                         *ep = expr_alloc_one(E_LIST, NULL);
 533                         (*ep)->right.sym = menu->sym;
 534                 }
 535
 536                 /*
 537                  * This code serves two purposes:
 538                  *
 539                  * (1) Flattening 'if' blocks, which do not specify a submenu
 540                  *     and only add dependencies.
 541                  *
 542                  *     (Automatic submenu creation might still create a submenu
 543                  *     from an 'if' before this code runs.)
 544                  *
 545                  * (2) "Undoing" any automatic submenus created earlier below
 546                  *     promptless symbols.
 547                  *
 548                  * Before:
 549                  *
 550                  *      A
 551                  *      if ... (or promptless symbol)
 552                  *       +-B
 553                  *       +-C
 554                  *      D
 555                  *
 556                  * After:
 557                  *
 558                  *      A
 559                  *      if ... (or promptless symbol)
 560                  *      B
 561                  *      C
 562                  *      D
 563                  */
 564                 if (menu->list && (!menu->prompt || !menu->prompt->text)) {
 565                         for (last_menu = menu->list; ; last_menu = last_menu->next) {
 566                                 last_menu->parent = parent;
 567                                 if (!last_menu->next)
 568                                         break;
 569                         }
 570                         last_menu->next = menu->next;
 571                         menu->next = menu->list;
 572                         menu->list = NULL;
 573                 }
 574         }
 575
 576         if (sym && !(sym->flags & SYMBOL_WARNED)) {
 577                 if (sym->type == S_UNKNOWN)
 578                         menu_warn(parent, "config symbol defined without type");
 579
 580                 if (sym_is_choice(sym) && !parent->prompt)
 581                         menu_warn(parent, "choice must have a prompt");
 582
 583                 /* Check properties connected to this symbol */
 584                 sym_check_prop(sym);
 585                 sym->flags |= SYMBOL_WARNED;
 586         }
 587
 588         /*
 589          * For non-optional choices, add a reverse dependency (corresponding to
 590          * a select) of '<visibility> && m'. This prevents the user from
 591          * setting the choice mode to 'n' when the choice is visible.
 592          *
 593          * This would also work for non-choice symbols, but only non-optional
 594          * choices clear SYMBOL_OPTIONAL as of writing. Choices are implemented
 595          * as a type of symbol.
 596          */
 597         if (sym && !sym_is_optional(sym) && parent->prompt) {
 598                 sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
 599                                 expr_alloc_and(parent->prompt->visible.expr,
 600                                         expr_alloc_symbol(&symbol_mod)));
 601         }
 602 }
 603
 604 bool menu_has_prompt(struct menu *menu)
 605 {
 606         if (!menu->prompt)
 607                 return false;
 608         return true;
 609 }
 610
 611 /*
 612  * Determine if a menu is empty.
 613  * A menu is considered empty if it contains no or only
 614  * invisible entries.
 615  */
 616 bool menu_is_empty(struct menu *menu)
 617 {
 618         struct menu *child;
 619
 620         for (child = menu->list; child; child = child->next) {
 621                 if (menu_is_visible(child))
 622                         return(false);
 623         }
 624         return(true);
 625 }
 626
 627 bool menu_is_visible(struct menu *menu)
 628 {
 629         struct menu *child;
 630         struct symbol *sym;
 631         tristate visible;
 632
 633         if (!menu->prompt)
 634                 return false;
 635
 636         if (menu->visibility) {
 637                 if (expr_calc_value(menu->visibility) == no)
 638                         return false;
 639         }
 640
 641         sym = menu->sym;
 642         if (sym) {
 643                 sym_calc_value(sym);
 644                 visible = menu->prompt->visible.tri;
 645         } else
 646                 visible = menu->prompt->visible.tri = expr_calc_value(menu->prompt->visible.expr);
 647
 648         if (visible != no)
 649                 return true;
 650
 651         if (!sym || sym_get_tristate_value(menu->sym) == no)
 652                 return false;
 653
 654         for (child = menu->list; child; child = child->next) {
 655                 if (menu_is_visible(child)) {
 656                         if (sym)
 657                                 sym->flags |= SYMBOL_DEF_USER;
 658                         return true;
 659                 }
 660         }
 661
 662         return false;
 663 }
 664
 665 const char *menu_get_prompt(struct menu *menu)
 666 {
 667         if (menu->prompt)
 668                 return menu->prompt->text;
 669         else if (menu->sym)
 670                 return menu->sym->name;
 671         return NULL;
 672 }
 673
 674 struct menu *menu_get_root_menu(struct menu *menu)
 675 {
 676         return &rootmenu;
 677 }
 678
 679 struct menu *menu_get_parent_menu(struct menu *menu)
 680 {
 681         enum prop_type type;
 682
 683         for (; menu != &rootmenu; menu = menu->parent) {
 684                 type = menu->prompt ? menu->prompt->type : 0;
 685                 if (type == P_MENU)
 686                         break;
 687         }
 688         return menu;
 689 }
 690
 691 bool menu_has_help(struct menu *menu)
 692 {
 693         return menu->help != NULL;
 694 }
 695
 696 const char *menu_get_help(struct menu *menu)
 697 {
 698         if (menu->help)
 699                 return menu->help;
 700         else
 701                 return "";
 702 }
 703
 704 static void get_prompt_str(struct gstr *r, struct property *prop,
 705                            struct list_head *head)
 706 {
 707         int i, j;
 708         struct menu *submenu[8], *menu, *location = NULL;
 709         struct jump_key *jump = NULL;
 710
 711         str_printf(r, "Prompt: %s\n", prop->text);
 712         menu = prop->menu->parent;
 713         for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
 714                 bool accessible = menu_is_visible(menu);
 715
 716                 submenu[i++] = menu;
 717                 if (location == NULL && accessible)
 718                         location = menu;
 719         }
 720         if (head && location) {
 721                 jump = xmalloc(sizeof(struct jump_key));
 722
 723                 if (menu_is_visible(prop->menu)) {
 724                         /*
 725                          * There is not enough room to put the hint at the
 726                          * beginning of the "Prompt" line. Put the hint on the
 727                          * last "Location" line even when it would belong on
 728                          * the former.
 729                          */
 730                         jump->target = prop->menu;
 731                 } else
 732                         jump->target = location;
 733
 734                 if (list_empty(head))
 735                         jump->index = 0;
 736                 else
 737                         jump->index = list_entry(head->prev, struct jump_key,
 738                                                  entries)->index + 1;
 739
 740                 list_add_tail(&jump->entries, head);
 741         }
 742
 743         if (i > 0) {
 744                 str_printf(r, "  Location:\n");
 745                 for (j = 4; --i >= 0; j += 2) {
 746                         menu = submenu[i];
 747                         if (jump && menu == location)
 748                                 jump->offset = strlen(r->s);
 749                         str_printf(r, "%*c-> %s", j, ' ',
 750                                    menu_get_prompt(menu));
 751                         if (menu->sym) {
 752                                 str_printf(r, " (%s [=%s])", menu->sym->name ?
 753                                         menu->sym->name : "<choice>",
 754                                         sym_get_string_value(menu->sym));
 755                         }
 756                         str_append(r, "\n");
 757                 }
 758         }
 759 }
 760
 761 /*
 762  * get property of type P_SYMBOL
 763  */
 764 static struct property *get_symbol_prop(struct symbol *sym)
 765 {
 766         struct property *prop = NULL;
 767
 768         for_all_properties(sym, prop, P_SYMBOL)
 769                 break;
 770         return prop;
 771 }
 772
 773 static void get_symbol_props_str(struct gstr *r, struct symbol *sym,
 774                                  enum prop_type tok, const char *prefix)
 775 {
 776         bool hit = false;
 777         struct property *prop;
 778
 779         for_all_properties(sym, prop, tok) {
 780                 if (!hit) {
 781                         str_append(r, prefix);
 782                         hit = true;
 783                 } else
 784                         str_printf(r, " && ");
 785                 expr_gstr_print(prop->expr, r);
 786         }
 787         if (hit)
 788                 str_append(r, "\n");
 789 }
 790
 791 /*
 792  * head is optional and may be NULL
 793  */
 794 static void get_symbol_str(struct gstr *r, struct symbol *sym,
 795                     struct list_head *head)
 796 {
 797         struct property *prop;
 798
 799         if (sym && sym->name) {
 800                 str_printf(r, "Symbol: %s [=%s]\n", sym->name,
 801                            sym_get_string_value(sym));
 802                 str_printf(r, "Type  : %s\n", sym_type_name(sym->type));
 803                 if (sym->type == S_INT || sym->type == S_HEX) {
 804                         prop = sym_get_range_prop(sym);
 805                         if (prop) {
 806                                 str_printf(r, "Range : ");
 807                                 expr_gstr_print(prop->expr, r);
 808                                 str_append(r, "\n");
 809                         }
 810                 }
 811         }
 812         for_all_prompts(sym, prop)
 813                 get_prompt_str(r, prop, head);
 814
 815         prop = get_symbol_prop(sym);
 816         if (prop) {
 817                 str_printf(r, "  Defined at %s:%d\n", prop->menu->file->name,
 818                         prop->menu->lineno);
 819                 if (!expr_is_yes(prop->visible.expr)) {
 820                         str_append(r, "  Depends on: ");
 821                         expr_gstr_print(prop->visible.expr, r);
 822                         str_append(r, "\n");
 823                 }
 824         }
 825
 826         get_symbol_props_str(r, sym, P_SELECT, "  Selects: ");
 827         if (sym->rev_dep.expr) {
 828                 expr_gstr_print_revdep(sym->rev_dep.expr, r, yes, "  Selected by [y]:\n");
 829                 expr_gstr_print_revdep(sym->rev_dep.expr, r, mod, "  Selected by [m]:\n");
 830                 expr_gstr_print_revdep(sym->rev_dep.expr, r, no, "  Selected by [n]:\n");
 831         }
 832
 833         get_symbol_props_str(r, sym, P_IMPLY, "  Implies: ");
 834         if (sym->implied.expr) {
 835                 expr_gstr_print_revdep(sym->implied.expr, r, yes, "  Implied by [y]:\n");
 836                 expr_gstr_print_revdep(sym->implied.expr, r, mod, "  Implied by [m]:\n");
 837                 expr_gstr_print_revdep(sym->implied.expr, r, no, "  Implied by [n]:\n");
 838         }
 839
 840         str_append(r, "\n\n");
 841 }
 842
 843 struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head)
 844 {
 845         struct symbol *sym;
 846         struct gstr res = str_new();
 847         int i;
 848
 849         for (i = 0; sym_arr && (sym = sym_arr[i]); i++)
 850                 get_symbol_str(&res, sym, head);
 851         if (!i)
 852                 str_append(&res, "No matches found.\n");
 853         return res;
 854 }
 855
 856
 857 void menu_get_ext_help(struct menu *menu, struct gstr *help)
 858 {
 859         struct symbol *sym = menu->sym;
 860         const char *help_text = nohelp_text;
 861
 862         if (menu_has_help(menu)) {
 863                 if (sym->name)
 864                         str_printf(help, "%s%s:\n\n", CONFIG_, sym->name);
 865                 help_text = menu_get_help(menu);
 866         }
 867         str_printf(help, "%s\n", help_text);
 868         if (sym)
 869                 get_symbol_str(help, sym, NULL);
 870 }