support/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 void menu_end_entry(void)
  66 {
  67 }
  68
  69 struct menu *menu_add_menu(void)
  70 {
  71         menu_end_entry();
  72         last_entry_ptr = &current_entry->list;
  73         return current_menu = current_entry;
  74 }
  75
  76 void menu_end_menu(void)
  77 {
  78         last_entry_ptr = &current_menu->next;
  79         current_menu = current_menu->parent;
  80 }
  81
  82 static struct expr *menu_check_dep(struct expr *e)
  83 {
  84         if (!e)
  85                 return e;
  86
  87         switch (e->type) {
  88         case E_NOT:
  89                 e->left.expr = menu_check_dep(e->left.expr);
  90                 break;
  91         case E_OR:
  92         case E_AND:
  93                 e->left.expr = menu_check_dep(e->left.expr);
  94                 e->right.expr = menu_check_dep(e->right.expr);
  95                 break;
  96         case E_SYMBOL:
  97                 /* change 'm' into 'm' && MODULES */
  98                 if (e->left.sym == &symbol_mod)
  99                         return expr_alloc_and(e, expr_alloc_symbol(modules_sym));
 100                 break;
 101         default:
 102                 break;
 103         }
 104         return e;
 105 }
 106
 107 void menu_add_dep(struct expr *dep)
 108 {
 109         current_entry->dep = expr_alloc_and(current_entry->dep, menu_check_dep(dep));
 110 }
 111
 112 void menu_set_type(int type)
 113 {
 114         struct symbol *sym = current_entry->sym;
 115
 116         if (sym->type == type)
 117                 return;
 118         if (sym->type == S_UNKNOWN) {
 119                 sym->type = type;
 120                 return;
 121         }
 122         menu_warn(current_entry,
 123                 "ignoring type redefinition of '%s' from '%s' to '%s'",
 124                 sym->name ? sym->name : "<choice>",
 125                 sym_type_name(sym->type), sym_type_name(type));
 126 }
 127
 128 struct property *menu_add_prop(enum prop_type type, char *prompt, struct expr *expr, struct expr *dep)
 129 {
 130         struct property *prop = prop_alloc(type, current_entry->sym);
 131
 132         prop->menu = current_entry;
 133         prop->expr = expr;
 134         prop->visible.expr = menu_check_dep(dep);
 135
 136         if (prompt) {
 137                 if (isspace(*prompt)) {
 138                         prop_warn(prop, "leading whitespace ignored");
 139                         while (isspace(*prompt))
 140                                 prompt++;
 141                 }
 142                 if (current_entry->prompt && current_entry != &rootmenu)
 143                         prop_warn(prop, "prompt redefined");
 144
 145                 /* Apply all upper menus' visibilities to actual prompts. */
 146                 if(type == P_PROMPT) {
 147                         struct menu *menu = current_entry;
 148
 149                         while ((menu = menu->parent) != NULL) {
 150                                 struct expr *dup_expr;
 151
 152                                 if (!menu->visibility)
 153                                         continue;
 154                                 /*
 155                                  * Do not add a reference to the
 156                                  * menu's visibility expression but
 157                                  * use a copy of it.  Otherwise the
 158                                  * expression reduction functions
 159                                  * will modify expressions that have
 160                                  * multiple references which can
 161                                  * cause unwanted side effects.
 162                                  */
 163                                 dup_expr = expr_copy(menu->visibility);
 164
 165                                 prop->visible.expr
 166                                         = expr_alloc_and(prop->visible.expr,
 167                                                          dup_expr);
 168                         }
 169                 }
 170
 171                 current_entry->prompt = prop;
 172         }
 173         prop->text = prompt;
 174
 175         return prop;
 176 }
 177
 178 struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep)
 179 {
 180         return menu_add_prop(type, prompt, NULL, dep);
 181 }
 182
 183 void menu_add_visibility(struct expr *expr)
 184 {
 185         current_entry->visibility = expr_alloc_and(current_entry->visibility,
 186             expr);
 187 }
 188
 189 void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep)
 190 {
 191         menu_add_prop(type, NULL, expr, dep);
 192 }
 193
 194 void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep)
 195 {
 196         menu_add_prop(type, NULL, expr_alloc_symbol(sym), dep);
 197 }
 198
 199 void menu_add_option(int token, char *arg)
 200 {
 201         switch (token) {
 202         case T_OPT_MODULES:
 203                 if (modules_sym)
 204                         zconf_error("symbol '%s' redefines option 'modules'"
 205                                     " already defined by symbol '%s'",
 206                                     current_entry->sym->name,
 207                                     modules_sym->name
 208                                     );
 209                 modules_sym = current_entry->sym;
 210                 break;
 211         case T_OPT_DEFCONFIG_LIST:
 212                 if (!sym_defconfig_list)
 213                         sym_defconfig_list = current_entry->sym;
 214                 else if (sym_defconfig_list != current_entry->sym)
 215                         zconf_error("trying to redefine defconfig symbol");
 216                 break;
 217         case T_OPT_ENV:
 218                 prop_add_env(arg);
 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         for (prop = sym->prop; prop; prop = prop->next) {
 234                 switch (prop->type) {
 235                 case P_DEFAULT:
 236                         if ((sym->type == S_STRING || sym->type == S_INT || sym->type == S_HEX) &&
 237                             prop->expr->type != E_SYMBOL)
 238                                 prop_warn(prop,
 239                                     "default for config symbol '%s'"
 240                                     " must be a single symbol", sym->name);
 241                         if (prop->expr->type != E_SYMBOL)
 242                                 break;
 243                         sym2 = prop_get_symbol(prop);
 244                         if (sym->type == S_HEX || sym->type == S_INT) {
 245                                 if (!menu_validate_number(sym, sym2))
 246                                         prop_warn(prop,
 247                                             "'%s': number is invalid",
 248                                             sym->name);
 249                         }
 250                         break;
 251                 case P_SELECT:
 252                         sym2 = prop_get_symbol(prop);
 253                         if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE)
 254                                 prop_warn(prop,
 255                                     "config symbol '%s' uses select, but is "
 256                                     "not boolean or tristate", sym->name);
 257                         else if (sym2->type != S_UNKNOWN &&
 258                                  sym2->type != S_BOOLEAN &&
 259                                  sym2->type != S_TRISTATE)
 260                                 prop_warn(prop,
 261                                     "'%s' has wrong type. 'select' only "
 262                                     "accept arguments of boolean and "
 263                                     "tristate type", sym2->name);
 264                         break;
 265                 case P_RANGE:
 266                         if (sym->type != S_INT && sym->type != S_HEX)
 267                                 prop_warn(prop, "range is only allowed "
 268                                                 "for int or hex symbols");
 269                         if (!menu_validate_number(sym, prop->expr->left.sym) ||
 270                             !menu_validate_number(sym, prop->expr->right.sym))
 271                                 prop_warn(prop, "range is invalid");
 272                         break;
 273                 default:
 274                         ;
 275                 }
 276         }
 277 }
 278
 279 void menu_finalize(struct menu *parent)
 280 {
 281         struct menu *menu, *last_menu;
 282         struct symbol *sym;
 283         struct property *prop;
 284         struct expr *parentdep, *basedep, *dep, *dep2, **ep;
 285
 286         sym = parent->sym;
 287         if (parent->list) {
 288                 if (sym && sym_is_choice(sym)) {
 289                         if (sym->type == S_UNKNOWN) {
 290                                 /* find the first choice value to find out choice type */
 291                                 current_entry = parent;
 292                                 for (menu = parent->list; menu; menu = menu->next) {
 293                                         if (menu->sym && menu->sym->type != S_UNKNOWN) {
 294                                                 menu_set_type(menu->sym->type);
 295                                                 break;
 296                                         }
 297                                 }
 298                         }
 299                         /* set the type of the remaining choice values */
 300                         for (menu = parent->list; menu; menu = menu->next) {
 301                                 current_entry = menu;
 302                                 if (menu->sym && menu->sym->type == S_UNKNOWN)
 303                                         menu_set_type(sym->type);
 304                         }
 305                         parentdep = expr_alloc_symbol(sym);
 306                 } else if (parent->prompt)
 307                         parentdep = parent->prompt->visible.expr;
 308                 else
 309                         parentdep = parent->dep;
 310
 311                 for (menu = parent->list; menu; menu = menu->next) {
 312                         basedep = expr_transform(menu->dep);
 313                         basedep = expr_alloc_and(expr_copy(parentdep), basedep);
 314                         basedep = expr_eliminate_dups(basedep);
 315                         menu->dep = basedep;
 316                         if (menu->sym)
 317                                 prop = menu->sym->prop;
 318                         else
 319                                 prop = menu->prompt;
 320                         for (; prop; prop = prop->next) {
 321                                 if (prop->menu != menu)
 322                                         continue;
 323                                 dep = expr_transform(prop->visible.expr);
 324                                 dep = expr_alloc_and(expr_copy(basedep), dep);
 325                                 dep = expr_eliminate_dups(dep);
 326                                 if (menu->sym && menu->sym->type != S_TRISTATE)
 327                                         dep = expr_trans_bool(dep);
 328                                 prop->visible.expr = dep;
 329                                 if (prop->type == P_SELECT) {
 330                                         struct symbol *es = prop_get_symbol(prop);
 331                                         es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
 332                                                         expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
 333                                 }
 334                         }
 335                 }
 336                 for (menu = parent->list; menu; menu = menu->next)
 337                         menu_finalize(menu);
 338         } else if (sym) {
 339                 basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
 340                 basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
 341                 basedep = expr_eliminate_dups(expr_transform(basedep));
 342                 last_menu = NULL;
 343                 for (menu = parent->next; menu; menu = menu->next) {
 344                         dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
 345                         if (!expr_contains_symbol(dep, sym))
 346                                 break;
 347                         if (expr_depends_symbol(dep, sym))
 348                                 goto next;
 349                         dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
 350                         dep = expr_eliminate_dups(expr_transform(dep));
 351                         dep2 = expr_copy(basedep);
 352                         expr_eliminate_eq(&dep, &dep2);
 353                         expr_free(dep);
 354                         if (!expr_is_yes(dep2)) {
 355                                 expr_free(dep2);
 356                                 break;
 357                         }
 358                         expr_free(dep2);
 359                 next:
 360                         menu_finalize(menu);
 361                         menu->parent = parent;
 362                         last_menu = menu;
 363                 }
 364                 if (last_menu) {
 365                         parent->list = parent->next;
 366                         parent->next = last_menu->next;
 367                         last_menu->next = NULL;
 368                 }
 369
 370                 sym->dir_dep.expr = expr_alloc_or(sym->dir_dep.expr, parent->dep);
 371         }
 372         for (menu = parent->list; menu; menu = menu->next) {
 373                 if (sym && sym_is_choice(sym) &&
 374                     menu->sym && !sym_is_choice_value(menu->sym)) {
 375                         current_entry = menu;
 376                         menu->sym->flags |= SYMBOL_CHOICEVAL;
 377                         if (!menu->prompt)
 378                                 menu_warn(menu, "choice value must have a prompt");
 379                         for (prop = menu->sym->prop; prop; prop = prop->next) {
 380                                 if (prop->type == P_DEFAULT)
 381                                         prop_warn(prop, "defaults for choice "
 382                                                   "values not supported");
 383                                 if (prop->menu == menu)
 384                                         continue;
 385                                 if (prop->type == P_PROMPT &&
 386                                     prop->menu->parent->sym != sym)
 387                                         prop_warn(prop, "choice value used outside its choice group");
 388                         }
 389                         /* Non-tristate choice values of tristate choices must
 390                          * depend on the choice being set to Y. The choice
 391                          * values' dependencies were propagated to their
 392                          * properties above, so the change here must be re-
 393                          * propagated.
 394                          */
 395                         if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
 396                                 basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
 397                                 menu->dep = expr_alloc_and(basedep, menu->dep);
 398                                 for (prop = menu->sym->prop; prop; prop = prop->next) {
 399                                         if (prop->menu != menu)
 400                                                 continue;
 401                                         prop->visible.expr = expr_alloc_and(expr_copy(basedep),
 402                                                                             prop->visible.expr);
 403                                 }
 404                         }
 405                         menu_add_symbol(P_CHOICE, sym, NULL);
 406                         prop = sym_get_choice_prop(sym);
 407                         for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
 408                                 ;
 409                         *ep = expr_alloc_one(E_LIST, NULL);
 410                         (*ep)->right.sym = menu->sym;
 411                 }
 412                 if (menu->list && (!menu->prompt || !menu->prompt->text)) {
 413                         for (last_menu = menu->list; ; last_menu = last_menu->next) {
 414                                 last_menu->parent = parent;
 415                                 if (!last_menu->next)
 416                                         break;
 417                         }
 418                         last_menu->next = menu->next;
 419                         menu->next = menu->list;
 420                         menu->list = NULL;
 421                 }
 422         }
 423
 424         if (sym && !(sym->flags & SYMBOL_WARNED)) {
 425                 if (sym->type == S_UNKNOWN)
 426                         menu_warn(parent, "config symbol defined without type");
 427
 428                 if (sym_is_choice(sym) && !parent->prompt)
 429                         menu_warn(parent, "choice must have a prompt");
 430
 431                 /* Check properties connected to this symbol */
 432                 sym_check_prop(sym);
 433                 sym->flags |= SYMBOL_WARNED;
 434         }
 435
 436         if (sym && !sym_is_optional(sym) && parent->prompt) {
 437                 sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
 438                                 expr_alloc_and(parent->prompt->visible.expr,
 439                                         expr_alloc_symbol(&symbol_mod)));
 440         }
 441 }
 442
 443 bool menu_has_prompt(struct menu *menu)
 444 {
 445         if (!menu->prompt)
 446                 return false;
 447         return true;
 448 }
 449
 450 /*
 451  * Determine if a menu is empty.
 452  * A menu is considered empty if it contains no or only
 453  * invisible entries.
 454  */
 455 bool menu_is_empty(struct menu *menu)
 456 {
 457         struct menu *child;
 458
 459         for (child = menu->list; child; child = child->next) {
 460                 if (menu_is_visible(child))
 461                         return(false);
 462         }
 463         return(true);
 464 }
 465
 466 bool menu_is_visible(struct menu *menu)
 467 {
 468         struct menu *child;
 469         struct symbol *sym;
 470         tristate visible;
 471
 472         if (!menu->prompt)
 473                 return false;
 474
 475         if (menu->visibility) {
 476                 if (expr_calc_value(menu->visibility) == no)
 477                         return no;
 478         }
 479
 480         sym = menu->sym;
 481         if (sym) {
 482                 sym_calc_value(sym);
 483                 visible = menu->prompt->visible.tri;
 484         } else
 485                 visible = menu->prompt->visible.tri = expr_calc_value(menu->prompt->visible.expr);
 486
 487         if (visible != no)
 488                 return true;
 489
 490         if (!sym || sym_get_tristate_value(menu->sym) == no)
 491                 return false;
 492
 493         for (child = menu->list; child; child = child->next) {
 494                 if (menu_is_visible(child)) {
 495                         if (sym)
 496                                 sym->flags |= SYMBOL_DEF_USER;
 497                         return true;
 498                 }
 499         }
 500
 501         return false;
 502 }
 503
 504 const char *menu_get_prompt(struct menu *menu)
 505 {
 506         if (menu->prompt)
 507                 return menu->prompt->text;
 508         else if (menu->sym)
 509                 return menu->sym->name;
 510         return NULL;
 511 }
 512
 513 struct menu *menu_get_root_menu(struct menu *menu)
 514 {
 515         return &rootmenu;
 516 }
 517
 518 struct menu *menu_get_parent_menu(struct menu *menu)
 519 {
 520         enum prop_type type;
 521
 522         for (; menu != &rootmenu; menu = menu->parent) {
 523                 type = menu->prompt ? menu->prompt->type : 0;
 524                 if (type == P_MENU)
 525                         break;
 526         }
 527         return menu;
 528 }
 529
 530 bool menu_has_help(struct menu *menu)
 531 {
 532         return menu->help != NULL;
 533 }
 534
 535 const char *menu_get_help(struct menu *menu)
 536 {
 537         if (menu->help)
 538                 return menu->help;
 539         else
 540                 return "";
 541 }
 542
 543 static void get_prompt_str(struct gstr *r, struct property *prop,
 544                            struct list_head *head)
 545 {
 546         int i, j;
 547         struct menu *submenu[8], *menu, *location = NULL;
 548         struct jump_key *jump;
 549
 550         str_printf(r, _("Prompt: %s\n"), _(prop->text));
 551         menu = prop->menu->parent;
 552         for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
 553                 bool accessible = menu_is_visible(menu);
 554
 555                 submenu[i++] = menu;
 556                 if (location == NULL && accessible)
 557                         location = menu;
 558         }
 559         if (head && location) {
 560                 jump = xmalloc(sizeof(struct jump_key));
 561
 562                 if (menu_is_visible(prop->menu)) {
 563                         /*
 564                          * There is not enough room to put the hint at the
 565                          * beginning of the "Prompt" line. Put the hint on the
 566                          * last "Location" line even when it would belong on
 567                          * the former.
 568                          */
 569                         jump->target = prop->menu;
 570                 } else
 571                         jump->target = location;
 572
 573                 if (list_empty(head))
 574                         jump->index = 0;
 575                 else
 576                         jump->index = list_entry(head->prev, struct jump_key,
 577                                                  entries)->index + 1;
 578
 579                 list_add_tail(&jump->entries, head);
 580         }
 581
 582         if (i > 0) {
 583                 str_printf(r, _("  Location:\n"));
 584                 for (j = 4; --i >= 0; j += 2) {
 585                         menu = submenu[i];
 586                         if (head && location && menu == location)
 587                                 jump->offset = strlen(r->s);
 588                         str_printf(r, "%*c-> %s", j, ' ',
 589                                    _(menu_get_prompt(menu)));
 590                         if (menu->sym) {
 591                                 str_printf(r, " (%s [=%s])", menu->sym->name ?
 592                                         menu->sym->name : _("<choice>"),
 593                                         sym_get_string_value(menu->sym));
 594                         }
 595                         str_append(r, "\n");
 596                 }
 597         }
 598 }
 599
 600 /*
 601  * get property of type P_SYMBOL
 602  */
 603 static struct property *get_symbol_prop(struct symbol *sym)
 604 {
 605         struct property *prop = NULL;
 606
 607         for_all_properties(sym, prop, P_SYMBOL)
 608                 break;
 609         return prop;
 610 }
 611
 612 /*
 613  * head is optional and may be NULL
 614  */
 615 void get_symbol_str(struct gstr *r, struct symbol *sym,
 616                     struct list_head *head)
 617 {
 618         bool hit;
 619         struct property *prop;
 620
 621         if (sym && sym->name) {
 622                 str_printf(r, "Symbol: %s [=%s]\n", sym->name,
 623                            sym_get_string_value(sym));
 624                 str_printf(r, "Type  : %s\n", sym_type_name(sym->type));
 625                 if (sym->type == S_INT || sym->type == S_HEX) {
 626                         prop = sym_get_range_prop(sym);
 627                         if (prop) {
 628                                 str_printf(r, "Range : ");
 629                                 expr_gstr_print(prop->expr, r);
 630                                 str_append(r, "\n");
 631                         }
 632                 }
 633         }
 634         for_all_prompts(sym, prop)
 635                 get_prompt_str(r, prop, head);
 636
 637         prop = get_symbol_prop(sym);
 638         if (prop) {
 639                 str_printf(r, _("  Defined at %s:%d\n"), prop->menu->file->name,
 640                         prop->menu->lineno);
 641                 if (!expr_is_yes(prop->visible.expr)) {
 642                         str_append(r, _("  Depends on: "));
 643                         expr_gstr_print(prop->visible.expr, r);
 644                         str_append(r, "\n");
 645                 }
 646         }
 647
 648         hit = false;
 649         for_all_properties(sym, prop, P_SELECT) {
 650                 if (!hit) {
 651                         str_append(r, "  Selects: ");
 652                         hit = true;
 653                 } else
 654                         str_printf(r, " && ");
 655                 expr_gstr_print(prop->expr, r);
 656         }
 657         if (hit)
 658                 str_append(r, "\n");
 659         if (sym->rev_dep.expr) {
 660                 str_append(r, _("  Selected by: "));
 661                 expr_gstr_print(sym->rev_dep.expr, r);
 662                 str_append(r, "\n");
 663         }
 664         str_append(r, "\n\n");
 665 }
 666
 667 struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head)
 668 {
 669         struct symbol *sym;
 670         struct gstr res = str_new();
 671         int i;
 672
 673         for (i = 0; sym_arr && (sym = sym_arr[i]); i++)
 674                 get_symbol_str(&res, sym, head);
 675         if (!i)
 676                 str_append(&res, _("No matches found.\n"));
 677         return res;
 678 }
 679
 680
 681 void menu_get_ext_help(struct menu *menu, struct gstr *help)
 682 {
 683         struct symbol *sym = menu->sym;
 684         const char *help_text = nohelp_text;
 685
 686         if (menu_has_help(menu)) {
 687                 if (sym->name)
 688                         str_printf(help, "%s%s:\n\n", CONFIG_, sym->name);
 689                 help_text = menu_get_help(menu);
 690         }
 691         str_printf(help, "%s\n", _(help_text));
 692         if (sym)
 693                 get_symbol_str(help, sym, NULL);
 694 }