[people/ms/u-boot.git] / common / menu.c

/*
 * Copyright 2010-2011 Calxeda, Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <malloc.h>
#include <errno.h>
#include <linux/list.h>

#include "menu.h"

/*
 * Internally, each item in a menu is represented by a struct menu_item.
 *
 * These items will be alloc'd and initialized by menu_item_add and destroyed
 * by menu_item_destroy, and the consumer of the interface never sees that
 * this struct is used at all.
 */
struct menu_item {
	char *key;
	void *data;
	struct list_head list;
};

/*
 * The menu is composed of a list of items along with settings and callbacks
 * provided by the user. An incomplete definition of this struct is available
 * in menu.h, but the full definition is here to prevent consumers from
 * relying on its contents.
 */
struct menu {
	struct menu_item *default_item;
	int timeout;
	char *title;
	int prompt;
	void (*item_data_print)(void *);
	char *(*item_choice)(void *);
	void *item_choice_data;
	struct list_head items;
};

/*
 * An iterator function for menu items. callback will be called for each item
 * in m, with m, a pointer to the item, and extra being passed to callback. If
 * callback returns a value other than NULL, iteration stops and the value
 * return by callback is returned from menu_items_iter.  This allows it to be
 * used for search type operations. It is also safe for callback to remove the
 * item from the list of items.
 */
static inline void *menu_items_iter(struct menu *m,
		void *(*callback)(struct menu *, struct menu_item *, void *),
		void *extra)
{
	struct list_head *pos, *n;
	struct menu_item *item;
	void *ret;

	list_for_each_safe(pos, n, &m->items) {
		item = list_entry(pos, struct menu_item, list);

		ret = callback(m, item, extra);

		if (ret)
			return ret;
	}

	return NULL;
}

/*
 * Print a menu_item. If the consumer provided an item_data_print function
 * when creating the menu, call it with a pointer to the item's private data.
 * Otherwise, print the key of the item.
 */
static inline void *menu_item_print(struct menu *m,
				struct menu_item *item,
				void *extra)
{
	if (!m->item_data_print) {
		puts(item->key);
		putc('\n');
	} else {
		m->item_data_print(item->data);
	}

	return NULL;
}

/*
 * Free the memory used by a menu item. This includes the memory used by its
 * key.
 */
static inline void *menu_item_destroy(struct menu *m,
				struct menu_item *item,
				void *extra)
{
	if (item->key)
		free(item->key);

	free(item);

	return NULL;
}

void __menu_display_statusline(struct menu *m)
{
	return;
}
void menu_display_statusline(struct menu *m)
	__attribute__ ((weak, alias("__menu_display_statusline")));

/*
 * Display a menu so the user can make a choice of an item. First display its
 * title, if any, and then each item in the menu.
 */
static inline void menu_display(struct menu *m)
{
	if (m->title) {
		puts(m->title);
		putc('\n');
	}
	menu_display_statusline(m);

	menu_items_iter(m, menu_item_print, NULL);
}

/*
 * Check if an item's key matches a provided string, pointed to by extra. If
 * extra is NULL, an item with a NULL key will match. Otherwise, the item's
 * key has to match according to strcmp.
 *
 * This is called via menu_items_iter, so it returns a pointer to the item if
 * the key matches, and returns NULL otherwise.
 */
static inline void *menu_item_key_match(struct menu *m,
			struct menu_item *item, void *extra)
{
	char *item_key = extra;

	if (!item_key || !item->key) {
		if (item_key == item->key)
			return item;

		return NULL;
	}

	if (strcmp(item->key, item_key) == 0)
		return item;

	return NULL;
}

/*
 * Find the first item with a key matching item_key, if any exists.
 */
static inline struct menu_item *menu_item_by_key(struct menu *m,
							char *item_key)
{
	return menu_items_iter(m, menu_item_key_match, item_key);
}

/*
 * Set *choice to point to the default item's data, if any default item was
 * set, and returns 1. If no default item was set, returns -ENOENT.
 */
int menu_default_choice(struct menu *m, void **choice)
{
	if (m->default_item) {
		*choice = m->default_item->data;
		return 1;
	}

	return -ENOENT;
}

/*
 * Displays the menu and asks the user to choose an item. *choice will point
 * to the private data of the item the user chooses. The user makes a choice
 * by inputting a string matching the key of an item. Invalid choices will
 * cause the user to be prompted again, repeatedly, until the user makes a
 * valid choice. The user can exit the menu without making a choice via ^c.
 *
 * Returns 1 if the user made a choice, or -EINTR if they bail via ^c.
 */
static inline int menu_interactive_choice(struct menu *m, void **choice)
{
	char cbuf[CONFIG_SYS_CBSIZE];
	struct menu_item *choice_item = NULL;
	int readret;

	while (!choice_item) {
		cbuf[0] = '\0';

		menu_display(m);

		if (!m->item_choice) {
			readret = readline_into_buffer("Enter choice: ", cbuf,
					m->timeout / 10);

			if (readret >= 0) {
				choice_item = menu_item_by_key(m, cbuf);
				if (!choice_item)
					printf("%s not found\n", cbuf);
			} else {
				return menu_default_choice(m, choice);
			}
		} else {
			char *key = m->item_choice(m->item_choice_data);

			if (key)
				choice_item = menu_item_by_key(m, key);
		}

		if (!choice_item)
			m->timeout = 0;
	}

	*choice = choice_item->data;

	return 1;
}

/*
 * menu_default_set() - Sets the default choice for the menu. This is safe to
 * call more than once on a menu.
 *
 * m - Points to a menu created by menu_create().
 *
 * item_key - Points to a string that, when compared using strcmp, matches the
 * key for an existing item in the menu.
 *
 * Returns 1 if successful, -EINVAL if m is NULL, or -ENOENT if no item with a
 * key matching item_key is found.
 */
int menu_default_set(struct menu *m, char *item_key)
{
	struct menu_item *item;

	if (!m)
		return -EINVAL;

	item = menu_item_by_key(m, item_key);

	if (!item)
		return -ENOENT;

	m->default_item = item;

	return 1;
}

/*
 * menu_get_choice() - Returns the user's selected menu entry, or the default
 * if the menu is set to not prompt or the timeout expires. This is safe to
 * call more than once.
 *
 * m - Points to a menu created by menu_create().
 *
 * choice - Points to a location that will store a pointer to the selected
 * menu item. If no item is selected or there is an error, no value will be
 * written at the location it points to.
 *
 * Returns 1 if successful, -EINVAL if m or choice is NULL, -ENOENT if no
 * default has been set and the menu is set to not prompt or the timeout
 * expires, or -EINTR if the user exits the menu via ^c.
 */
int menu_get_choice(struct menu *m, void **choice)
{
	if (!m || !choice)
		return -EINVAL;

	if (!m->prompt)
		return menu_default_choice(m, choice);

	return menu_interactive_choice(m, choice);
}

/*
 * menu_item_add() - Adds or replaces a menu item. Note that this replaces the
 * data of an item if it already exists, but doesn't change the order of the
 * item.
 *
 * m - Points to a menu created by menu_create().
 *
 * item_key - Points to a string that will uniquely identify the item.  The
 * string will be copied to internal storage, and is safe to discard after
 * passing to menu_item_add.
 *
 * item_data - An opaque pointer associated with an item. It is never
 * dereferenced internally, but will be passed to the item_data_print, and
 * will be returned from menu_get_choice if the menu item is selected.
 *
 * Returns 1 if successful, -EINVAL if m is NULL, or -ENOMEM if there is
 * insufficient memory to add the menu item.
 */
int menu_item_add(struct menu *m, char *item_key, void *item_data)
{
	struct menu_item *item;

	if (!m)
		return -EINVAL;

	item = menu_item_by_key(m, item_key);

	if (item) {
		item->data = item_data;
		return 1;
	}

	item = malloc(sizeof *item);
	if (!item)
		return -ENOMEM;

	item->key = strdup(item_key);

	if (!item->key) {
		free(item);
		return -ENOMEM;
	}

	item->data = item_data;

	list_add_tail(&item->list, &m->items);

	return 1;
}

/*
 * menu_create() - Creates a menu handle with default settings
 *
 * title - If not NULL, points to a string that will be displayed before the
 * list of menu items. It will be copied to internal storage, and is safe to
 * discard after passing to menu_create().
 *
 * timeout - A delay in seconds to wait for user input. If 0, timeout is
 * disabled, and the default choice will be returned unless prompt is 1.
 *
 * prompt - If 0, don't ask for user input unless there is an interrupted
 * timeout. If 1, the user will be prompted for input regardless of the value
 * of timeout.
 *
 * item_data_print - If not NULL, will be called for each item when the menu
 * is displayed, with the pointer to the item's data passed as the argument.
 * If NULL, each item's key will be printed instead.  Since an item's key is
 * what must be entered to select an item, the item_data_print function should
 * make it obvious what the key for each entry is.
 *
 * item_choice - If not NULL, will be called when asking the user to choose an
 * item. Returns a key string corresponding to the choosen item or NULL if
 * no item has been selected.
 *
 * item_choice_data - Will be passed as the argument to the item_choice function
 *
 * Returns a pointer to the menu if successful, or NULL if there is
 * insufficient memory available to create the menu.
 */
struct menu *menu_create(char *title, int timeout, int prompt,
				void (*item_data_print)(void *),
				char *(*item_choice)(void *),
				void *item_choice_data)
{
	struct menu *m;

	m = malloc(sizeof *m);

	if (!m)
		return NULL;

	m->default_item = NULL;
	m->prompt = prompt;
	m->timeout = timeout;
	m->item_data_print = item_data_print;
	m->item_choice = item_choice;
	m->item_choice_data = item_choice_data;

	if (title) {
		m->title = strdup(title);
		if (!m->title) {
			free(m);
			return NULL;
		}
	} else
		m->title = NULL;


	INIT_LIST_HEAD(&m->items);

	return m;
}

/*
 * menu_destroy() - frees the memory used by a menu and its items.
 *
 * m - Points to a menu created by menu_create().
 *
 * Returns 1 if successful, or -EINVAL if m is NULL.
 */
int menu_destroy(struct menu *m)
{
	if (!m)
		return -EINVAL;

	menu_items_iter(m, menu_item_destroy, NULL);

	if (m->title)
		free(m->title);

	free(m);

	return 1;
}
Commit	Line	Data
b69bf52d JH	1	/*
	2	* Copyright 2010-2011 Calxeda, Inc.
	3	*
1a459660	4	* SPDX-License-Identifier: GPL-2.0+
b69bf52d JH	5	*/
	6
	7	#include <common.h>
	8	#include <malloc.h>
	9	#include <errno.h>
	10	#include <linux/list.h>
	11
	12	#include "menu.h"
	13
	14	/*
	15	* Internally, each item in a menu is represented by a struct menu_item.
	16	*
	17	* These items will be alloc'd and initialized by menu_item_add and destroyed
	18	* by menu_item_destroy, and the consumer of the interface never sees that
	19	* this struct is used at all.
	20	*/
	21	struct menu_item {
	22	char *key;
	23	void *data;
	24	struct list_head list;
	25	};
	26
	27	/*
	28	* The menu is composed of a list of items along with settings and callbacks
	29	* provided by the user. An incomplete definition of this struct is available
	30	* in menu.h, but the full definition is here to prevent consumers from
	31	* relying on its contents.
	32	*/
	33	struct menu {
	34	struct menu_item *default_item;
b41bc5a8	35	int timeout;
b69bf52d JH	36	char *title;
	37	int prompt;
	38	void (item_data_print)(void );
fc9d64ff PR	39	char (item_choice)(void *);
fc9d64ff PR	40	void *item_choice_data;
b69bf52d JH	41	struct list_head items;
	42	};
	43
	44	/*
	45	* An iterator function for menu items. callback will be called for each item
	46	* in m, with m, a pointer to the item, and extra being passed to callback. If
	47	* callback returns a value other than NULL, iteration stops and the value
	48	* return by callback is returned from menu_items_iter. This allows it to be
	49	* used for search type operations. It is also safe for callback to remove the
	50	* item from the list of items.
	51	*/
	52	static inline void menu_items_iter(struct menu m,
	53	void (callback)(struct menu , struct menu_item , void *),
	54	void *extra)
	55	{
	56	struct list_head pos, n;
	57	struct menu_item *item;
	58	void *ret;
	59
	60	list_for_each_safe(pos, n, &m->items) {
	61	item = list_entry(pos, struct menu_item, list);
	62
	63	ret = callback(m, item, extra);
	64
	65	if (ret)
	66	return ret;
	67	}
	68
	69	return NULL;
	70	}
	71
	72	/*
	73	* Print a menu_item. If the consumer provided an item_data_print function
	74	* when creating the menu, call it with a pointer to the item's private data.
	75	* Otherwise, print the key of the item.
	76	*/
	77	static inline void menu_item_print(struct menu m,
	78	struct menu_item *item,
	79	void *extra)
	80	{
d887ad54	81	if (!m->item_data_print) {
21574976	82	puts(item->key);
d887ad54 WD	83	putc('\n');
d887ad54 WD	84	} else {
b69bf52d	85	m->item_data_print(item->data);
d887ad54	86	}
b69bf52d JH	87
	88	return NULL;
	89	}
	90
	91	/*
	92	* Free the memory used by a menu item. This includes the memory used by its
	93	* key.
	94	*/
	95	static inline void menu_item_destroy(struct menu m,
	96	struct menu_item *item,
	97	void *extra)
	98	{
	99	if (item->key)
	100	free(item->key);
	101
	102	free(item);
	103
	104	return NULL;
	105	}
	106
e0611dd9 HS	107	void __menu_display_statusline(struct menu *m)
	108	{
	109	return;
	110	}
	111	void menu_display_statusline(struct menu *m)
	112	__attribute__ ((weak, alias("__menu_display_statusline")));
	113
b69bf52d JH	114	/*
	115	* Display a menu so the user can make a choice of an item. First display its
	116	* title, if any, and then each item in the menu.
	117	*/
	118	static inline void menu_display(struct menu *m)
	119	{
d887ad54 WD	120	if (m->title) {
	121	puts(m->title);
	122	putc('\n');
	123	}
e0611dd9	124	menu_display_statusline(m);
b69bf52d JH	125
	126	menu_items_iter(m, menu_item_print, NULL);
	127	}
	128
	129	/*
	130	* Check if an item's key matches a provided string, pointed to by extra. If
	131	* extra is NULL, an item with a NULL key will match. Otherwise, the item's
	132	* key has to match according to strcmp.
	133	*
	134	* This is called via menu_items_iter, so it returns a pointer to the item if
	135	* the key matches, and returns NULL otherwise.
	136	*/
	137	static inline void menu_item_key_match(struct menu m,
	138	struct menu_item item, void extra)
	139	{
	140	char *item_key = extra;
	141
	142	if (!item_key \|\| !item->key) {
	143	if (item_key == item->key)
	144	return item;
	145
	146	return NULL;
	147	}
	148
	149	if (strcmp(item->key, item_key) == 0)
	150	return item;
	151
	152	return NULL;
	153	}
	154
	155	/*
	156	* Find the first item with a key matching item_key, if any exists.
	157	*/
	158	static inline struct menu_item menu_item_by_key(struct menu m,
	159	char *item_key)
	160	{
	161	return menu_items_iter(m, menu_item_key_match, item_key);
	162	}
	163
b69bf52d JH	164	/*
	165	* Set *choice to point to the default item's data, if any default item was
	166	* set, and returns 1. If no default item was set, returns -ENOENT.
	167	*/
6a3439fd	168	int menu_default_choice(struct menu m, void *choice)
b69bf52d JH	169	{
	170	if (m->default_item) {
	171	*choice = m->default_item->data;
	172	return 1;
	173	}
	174
	175	return -ENOENT;
	176	}
	177
	178	/*
	179	* Displays the menu and asks the user to choose an item. *choice will point
	180	* to the private data of the item the user chooses. The user makes a choice
	181	* by inputting a string matching the key of an item. Invalid choices will
	182	* cause the user to be prompted again, repeatedly, until the user makes a
	183	* valid choice. The user can exit the menu without making a choice via ^c.
	184	*
	185	* Returns 1 if the user made a choice, or -EINTR if they bail via ^c.
	186	*/
	187	static inline int menu_interactive_choice(struct menu m, void *choice)
	188	{
	189	char cbuf[CONFIG_SYS_CBSIZE];
	190	struct menu_item *choice_item = NULL;
	191	int readret;
	192
	193	while (!choice_item) {
	194	cbuf[0] = '\0';
	195
	196	menu_display(m);
	197
fc9d64ff PR	198	if (!m->item_choice) {
	199	readret = readline_into_buffer("Enter choice: ", cbuf,
	200	m->timeout / 10);
b69bf52d	201
fc9d64ff PR	202	if (readret >= 0) {
	203	choice_item = menu_item_by_key(m, cbuf);
	204	if (!choice_item)
	205	printf("%s not found\n", cbuf);
	206	} else {
	207	return menu_default_choice(m, choice);
fc4fa6a1	208	}
fc9d64ff PR	209	} else {
	210	char *key = m->item_choice(m->item_choice_data);
	211
	212	if (key)
	213	choice_item = menu_item_by_key(m, key);
	214	}
	215
	216	if (!choice_item)
	217	m->timeout = 0;
b69bf52d JH	218	}
	219
	220	*choice = choice_item->data;
	221
	222	return 1;
	223	}
	224
	225	/*
	226	* menu_default_set() - Sets the default choice for the menu. This is safe to
	227	* call more than once on a menu.
	228	*
	229	* m - Points to a menu created by menu_create().
	230	*
	231	* item_key - Points to a string that, when compared using strcmp, matches the
	232	* key for an existing item in the menu.
	233	*
	234	* Returns 1 if successful, -EINVAL if m is NULL, or -ENOENT if no item with a
	235	* key matching item_key is found.
	236	*/
	237	int menu_default_set(struct menu m, char item_key)
	238	{
	239	struct menu_item *item;
	240
	241	if (!m)
	242	return -EINVAL;
	243
	244	item = menu_item_by_key(m, item_key);
	245
	246	if (!item)
	247	return -ENOENT;
	248
	249	m->default_item = item;
	250
	251	return 1;
	252	}
	253
	254	/*
	255	* menu_get_choice() - Returns the user's selected menu entry, or the default
b41bc5a8 JH	256	* if the menu is set to not prompt or the timeout expires. This is safe to
b41bc5a8 JH	257	* call more than once.
b69bf52d JH	258	*
	259	* m - Points to a menu created by menu_create().
	260	*
	261	* choice - Points to a location that will store a pointer to the selected
	262	* menu item. If no item is selected or there is an error, no value will be
	263	* written at the location it points to.
	264	*
	265	* Returns 1 if successful, -EINVAL if m or choice is NULL, -ENOENT if no
b41bc5a8 JH	266	* default has been set and the menu is set to not prompt or the timeout
b41bc5a8 JH	267	* expires, or -EINTR if the user exits the menu via ^c.
b69bf52d JH	268	*/
	269	int menu_get_choice(struct menu m, void *choice)
	270	{
	271	if (!m \|\| !choice)
	272	return -EINVAL;
	273
8594753b	274	if (!m->prompt)
b69bf52d JH	275	return menu_default_choice(m, choice);
	276
	277	return menu_interactive_choice(m, choice);
	278	}
	279
	280	/*
	281	* menu_item_add() - Adds or replaces a menu item. Note that this replaces the
	282	* data of an item if it already exists, but doesn't change the order of the
	283	* item.
	284	*
	285	* m - Points to a menu created by menu_create().
	286	*
	287	* item_key - Points to a string that will uniquely identify the item. The
	288	* string will be copied to internal storage, and is safe to discard after
	289	* passing to menu_item_add.
	290	*
	291	* item_data - An opaque pointer associated with an item. It is never
	292	* dereferenced internally, but will be passed to the item_data_print, and
	293	* will be returned from menu_get_choice if the menu item is selected.
	294	*
	295	* Returns 1 if successful, -EINVAL if m is NULL, or -ENOMEM if there is
	296	* insufficient memory to add the menu item.
	297	*/
	298	int menu_item_add(struct menu m, char item_key, void *item_data)
	299	{
	300	struct menu_item *item;
	301
	302	if (!m)
	303	return -EINVAL;
	304
	305	item = menu_item_by_key(m, item_key);
	306
	307	if (item) {
	308	item->data = item_data;
	309	return 1;
	310	}
	311
	312	item = malloc(sizeof *item);
	313	if (!item)
	314	return -ENOMEM;
	315
	316	item->key = strdup(item_key);
	317
	318	if (!item->key) {
	319	free(item);
	320	return -ENOMEM;
	321	}
	322
	323	item->data = item_data;
	324
	325	list_add_tail(&item->list, &m->items);
	326
	327	return 1;
	328	}
	329
	330	/*
	331	* menu_create() - Creates a menu handle with default settings
	332	*
	333	* title - If not NULL, points to a string that will be displayed before the
	334	* list of menu items. It will be copied to internal storage, and is safe to
	335	* discard after passing to menu_create().
	336	*
b41bc5a8 JH	337	* timeout - A delay in seconds to wait for user input. If 0, timeout is
	338	* disabled, and the default choice will be returned unless prompt is 1.
	339	*
	340	* prompt - If 0, don't ask for user input unless there is an interrupted
	341	* timeout. If 1, the user will be prompted for input regardless of the value
	342	* of timeout.
b69bf52d JH	343	*
	344	* item_data_print - If not NULL, will be called for each item when the menu
	345	* is displayed, with the pointer to the item's data passed as the argument.
	346	* If NULL, each item's key will be printed instead. Since an item's key is
	347	* what must be entered to select an item, the item_data_print function should
	348	* make it obvious what the key for each entry is.
	349	*
fc9d64ff PR	350	* item_choice - If not NULL, will be called when asking the user to choose an
	351	* item. Returns a key string corresponding to the choosen item or NULL if
	352	* no item has been selected.
	353	*
	354	* item_choice_data - Will be passed as the argument to the item_choice function
	355	*
b69bf52d JH	356	* Returns a pointer to the menu if successful, or NULL if there is
	357	* insufficient memory available to create the menu.
	358	*/
b41bc5a8	359	struct menu menu_create(char title, int timeout, int prompt,
fc9d64ff PR	360	void (item_data_print)(void ),
	361	char (item_choice)(void *),
	362	void *item_choice_data)
b69bf52d JH	363	{
	364	struct menu *m;
	365
	366	m = malloc(sizeof *m);
	367
	368	if (!m)
	369	return NULL;
	370
	371	m->default_item = NULL;
	372	m->prompt = prompt;
b41bc5a8	373	m->timeout = timeout;
b69bf52d	374	m->item_data_print = item_data_print;
fc9d64ff PR	375	m->item_choice = item_choice;
fc9d64ff PR	376	m->item_choice_data = item_choice_data;
b69bf52d JH	377
	378	if (title) {
	379	m->title = strdup(title);
	380	if (!m->title) {
	381	free(m);
	382	return NULL;
	383	}
	384	} else
	385	m->title = NULL;
	386
	387
	388	INIT_LIST_HEAD(&m->items);
	389
	390	return m;
	391	}
	392
	393	/*
	394	* menu_destroy() - frees the memory used by a menu and its items.
	395	*
	396	* m - Points to a menu created by menu_create().
	397	*
	398	* Returns 1 if successful, or -EINVAL if m is NULL.
	399	*/
	400	int menu_destroy(struct menu *m)
	401	{
	402	if (!m)
	403	return -EINVAL;
	404
	405	menu_items_iter(m, menu_item_destroy, NULL);
	406
	407	if (m->title)
	408	free(m->title);
	409
	410	free(m);
	411
	412	return 1;
	413	}