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