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Jason Hobbsb69bf522011-08-23 11:06:49 +00001/*
2 * Copyright 2010-2011 Calxeda, Inc.
3 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02004 * SPDX-License-Identifier: GPL-2.0+
Jason Hobbsb69bf522011-08-23 11:06:49 +00005 */
6
7#include <common.h>
Simon Glass18d66532014-04-10 20:01:25 -06008#include <cli.h>
Jason Hobbsb69bf522011-08-23 11:06:49 +00009#include <malloc.h>
10#include <errno.h>
11#include <linux/list.h>
12
13#include "menu.h"
14
15/*
16 * Internally, each item in a menu is represented by a struct menu_item.
17 *
18 * These items will be alloc'd and initialized by menu_item_add and destroyed
19 * by menu_item_destroy, and the consumer of the interface never sees that
20 * this struct is used at all.
21 */
22struct menu_item {
23 char *key;
24 void *data;
25 struct list_head list;
26};
27
28/*
29 * The menu is composed of a list of items along with settings and callbacks
30 * provided by the user. An incomplete definition of this struct is available
31 * in menu.h, but the full definition is here to prevent consumers from
32 * relying on its contents.
33 */
34struct menu {
35 struct menu_item *default_item;
Jason Hobbsb41bc5a2011-08-23 11:06:50 +000036 int timeout;
Jason Hobbsb69bf522011-08-23 11:06:49 +000037 char *title;
38 int prompt;
39 void (*item_data_print)(void *);
Pali Rohárfc9d64f2013-03-23 14:50:40 +000040 char *(*item_choice)(void *);
41 void *item_choice_data;
Jason Hobbsb69bf522011-08-23 11:06:49 +000042 struct list_head items;
43};
44
45/*
46 * An iterator function for menu items. callback will be called for each item
47 * in m, with m, a pointer to the item, and extra being passed to callback. If
48 * callback returns a value other than NULL, iteration stops and the value
49 * return by callback is returned from menu_items_iter. This allows it to be
50 * used for search type operations. It is also safe for callback to remove the
51 * item from the list of items.
52 */
53static inline void *menu_items_iter(struct menu *m,
54 void *(*callback)(struct menu *, struct menu_item *, void *),
55 void *extra)
56{
57 struct list_head *pos, *n;
58 struct menu_item *item;
59 void *ret;
60
61 list_for_each_safe(pos, n, &m->items) {
62 item = list_entry(pos, struct menu_item, list);
63
64 ret = callback(m, item, extra);
65
66 if (ret)
67 return ret;
68 }
69
70 return NULL;
71}
72
73/*
74 * Print a menu_item. If the consumer provided an item_data_print function
75 * when creating the menu, call it with a pointer to the item's private data.
76 * Otherwise, print the key of the item.
77 */
78static inline void *menu_item_print(struct menu *m,
79 struct menu_item *item,
80 void *extra)
81{
Wolfgang Denkd887ad52011-11-28 20:19:41 +010082 if (!m->item_data_print) {
Anatolij Gustschin21574972011-12-03 06:46:07 +000083 puts(item->key);
Wolfgang Denkd887ad52011-11-28 20:19:41 +010084 putc('\n');
85 } else {
Jason Hobbsb69bf522011-08-23 11:06:49 +000086 m->item_data_print(item->data);
Wolfgang Denkd887ad52011-11-28 20:19:41 +010087 }
Jason Hobbsb69bf522011-08-23 11:06:49 +000088
89 return NULL;
90}
91
92/*
93 * Free the memory used by a menu item. This includes the memory used by its
94 * key.
95 */
96static inline void *menu_item_destroy(struct menu *m,
97 struct menu_item *item,
98 void *extra)
99{
100 if (item->key)
101 free(item->key);
102
103 free(item);
104
105 return NULL;
106}
107
Heiko Schochere0611dd2012-01-16 21:13:20 +0000108void __menu_display_statusline(struct menu *m)
109{
110 return;
111}
112void menu_display_statusline(struct menu *m)
113 __attribute__ ((weak, alias("__menu_display_statusline")));
114
Jason Hobbsb69bf522011-08-23 11:06:49 +0000115/*
116 * Display a menu so the user can make a choice of an item. First display its
117 * title, if any, and then each item in the menu.
118 */
119static inline void menu_display(struct menu *m)
120{
Wolfgang Denkd887ad52011-11-28 20:19:41 +0100121 if (m->title) {
122 puts(m->title);
123 putc('\n');
124 }
Heiko Schochere0611dd2012-01-16 21:13:20 +0000125 menu_display_statusline(m);
Jason Hobbsb69bf522011-08-23 11:06:49 +0000126
127 menu_items_iter(m, menu_item_print, NULL);
128}
129
130/*
131 * Check if an item's key matches a provided string, pointed to by extra. If
132 * extra is NULL, an item with a NULL key will match. Otherwise, the item's
133 * key has to match according to strcmp.
134 *
135 * This is called via menu_items_iter, so it returns a pointer to the item if
136 * the key matches, and returns NULL otherwise.
137 */
138static inline void *menu_item_key_match(struct menu *m,
139 struct menu_item *item, void *extra)
140{
141 char *item_key = extra;
142
143 if (!item_key || !item->key) {
144 if (item_key == item->key)
145 return item;
146
147 return NULL;
148 }
149
150 if (strcmp(item->key, item_key) == 0)
151 return item;
152
153 return NULL;
154}
155
156/*
157 * Find the first item with a key matching item_key, if any exists.
158 */
159static inline struct menu_item *menu_item_by_key(struct menu *m,
160 char *item_key)
161{
162 return menu_items_iter(m, menu_item_key_match, item_key);
163}
164
165/*
Jason Hobbsb69bf522011-08-23 11:06:49 +0000166 * Set *choice to point to the default item's data, if any default item was
167 * set, and returns 1. If no default item was set, returns -ENOENT.
168 */
Anatolij Gustschin6a3439f2013-03-23 14:52:04 +0000169int menu_default_choice(struct menu *m, void **choice)
Jason Hobbsb69bf522011-08-23 11:06:49 +0000170{
171 if (m->default_item) {
172 *choice = m->default_item->data;
173 return 1;
174 }
175
176 return -ENOENT;
177}
178
179/*
180 * Displays the menu and asks the user to choose an item. *choice will point
181 * to the private data of the item the user chooses. The user makes a choice
182 * by inputting a string matching the key of an item. Invalid choices will
183 * cause the user to be prompted again, repeatedly, until the user makes a
184 * valid choice. The user can exit the menu without making a choice via ^c.
185 *
186 * Returns 1 if the user made a choice, or -EINTR if they bail via ^c.
187 */
188static inline int menu_interactive_choice(struct menu *m, void **choice)
189{
190 char cbuf[CONFIG_SYS_CBSIZE];
191 struct menu_item *choice_item = NULL;
192 int readret;
193
194 while (!choice_item) {
195 cbuf[0] = '\0';
196
197 menu_display(m);
198
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000199 if (!m->item_choice) {
Simon Glasse1bf8242014-04-10 20:01:27 -0600200 readret = cli_readline_into_buffer("Enter choice: ",
201 cbuf,
202 m->timeout / 10);
Jason Hobbsb69bf522011-08-23 11:06:49 +0000203
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000204 if (readret >= 0) {
205 choice_item = menu_item_by_key(m, cbuf);
206 if (!choice_item)
207 printf("%s not found\n", cbuf);
208 } else {
209 return menu_default_choice(m, choice);
Heiko Schocherfc4fa6a2012-01-16 22:24:29 +0000210 }
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000211 } else {
212 char *key = m->item_choice(m->item_choice_data);
213
214 if (key)
215 choice_item = menu_item_by_key(m, key);
216 }
217
218 if (!choice_item)
219 m->timeout = 0;
Jason Hobbsb69bf522011-08-23 11:06:49 +0000220 }
221
222 *choice = choice_item->data;
223
224 return 1;
225}
226
227/*
228 * menu_default_set() - Sets the default choice for the menu. This is safe to
229 * call more than once on a menu.
230 *
231 * m - Points to a menu created by menu_create().
232 *
233 * item_key - Points to a string that, when compared using strcmp, matches the
234 * key for an existing item in the menu.
235 *
236 * Returns 1 if successful, -EINVAL if m is NULL, or -ENOENT if no item with a
237 * key matching item_key is found.
238 */
239int menu_default_set(struct menu *m, char *item_key)
240{
241 struct menu_item *item;
242
243 if (!m)
244 return -EINVAL;
245
246 item = menu_item_by_key(m, item_key);
247
248 if (!item)
249 return -ENOENT;
250
251 m->default_item = item;
252
253 return 1;
254}
255
256/*
257 * menu_get_choice() - Returns the user's selected menu entry, or the default
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000258 * if the menu is set to not prompt or the timeout expires. This is safe to
259 * call more than once.
Jason Hobbsb69bf522011-08-23 11:06:49 +0000260 *
261 * m - Points to a menu created by menu_create().
262 *
263 * choice - Points to a location that will store a pointer to the selected
264 * menu item. If no item is selected or there is an error, no value will be
265 * written at the location it points to.
266 *
267 * Returns 1 if successful, -EINVAL if m or choice is NULL, -ENOENT if no
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000268 * default has been set and the menu is set to not prompt or the timeout
269 * expires, or -EINTR if the user exits the menu via ^c.
Jason Hobbsb69bf522011-08-23 11:06:49 +0000270 */
271int menu_get_choice(struct menu *m, void **choice)
272{
273 if (!m || !choice)
274 return -EINVAL;
275
Rob Herring85947532012-03-28 05:51:32 +0000276 if (!m->prompt)
Jason Hobbsb69bf522011-08-23 11:06:49 +0000277 return menu_default_choice(m, choice);
278
279 return menu_interactive_choice(m, choice);
280}
281
282/*
283 * menu_item_add() - Adds or replaces a menu item. Note that this replaces the
284 * data of an item if it already exists, but doesn't change the order of the
285 * item.
286 *
287 * m - Points to a menu created by menu_create().
288 *
289 * item_key - Points to a string that will uniquely identify the item. The
290 * string will be copied to internal storage, and is safe to discard after
291 * passing to menu_item_add.
292 *
293 * item_data - An opaque pointer associated with an item. It is never
294 * dereferenced internally, but will be passed to the item_data_print, and
295 * will be returned from menu_get_choice if the menu item is selected.
296 *
297 * Returns 1 if successful, -EINVAL if m is NULL, or -ENOMEM if there is
298 * insufficient memory to add the menu item.
299 */
300int menu_item_add(struct menu *m, char *item_key, void *item_data)
301{
302 struct menu_item *item;
303
304 if (!m)
305 return -EINVAL;
306
307 item = menu_item_by_key(m, item_key);
308
309 if (item) {
310 item->data = item_data;
311 return 1;
312 }
313
314 item = malloc(sizeof *item);
315 if (!item)
316 return -ENOMEM;
317
318 item->key = strdup(item_key);
319
320 if (!item->key) {
321 free(item);
322 return -ENOMEM;
323 }
324
325 item->data = item_data;
326
327 list_add_tail(&item->list, &m->items);
328
329 return 1;
330}
331
332/*
333 * menu_create() - Creates a menu handle with default settings
334 *
335 * title - If not NULL, points to a string that will be displayed before the
336 * list of menu items. It will be copied to internal storage, and is safe to
337 * discard after passing to menu_create().
338 *
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000339 * timeout - A delay in seconds to wait for user input. If 0, timeout is
340 * disabled, and the default choice will be returned unless prompt is 1.
341 *
342 * prompt - If 0, don't ask for user input unless there is an interrupted
343 * timeout. If 1, the user will be prompted for input regardless of the value
344 * of timeout.
Jason Hobbsb69bf522011-08-23 11:06:49 +0000345 *
346 * item_data_print - If not NULL, will be called for each item when the menu
347 * is displayed, with the pointer to the item's data passed as the argument.
348 * If NULL, each item's key will be printed instead. Since an item's key is
349 * what must be entered to select an item, the item_data_print function should
350 * make it obvious what the key for each entry is.
351 *
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000352 * item_choice - If not NULL, will be called when asking the user to choose an
353 * item. Returns a key string corresponding to the choosen item or NULL if
354 * no item has been selected.
355 *
356 * item_choice_data - Will be passed as the argument to the item_choice function
357 *
Jason Hobbsb69bf522011-08-23 11:06:49 +0000358 * Returns a pointer to the menu if successful, or NULL if there is
359 * insufficient memory available to create the menu.
360 */
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000361struct menu *menu_create(char *title, int timeout, int prompt,
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000362 void (*item_data_print)(void *),
363 char *(*item_choice)(void *),
364 void *item_choice_data)
Jason Hobbsb69bf522011-08-23 11:06:49 +0000365{
366 struct menu *m;
367
368 m = malloc(sizeof *m);
369
370 if (!m)
371 return NULL;
372
373 m->default_item = NULL;
374 m->prompt = prompt;
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000375 m->timeout = timeout;
Jason Hobbsb69bf522011-08-23 11:06:49 +0000376 m->item_data_print = item_data_print;
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000377 m->item_choice = item_choice;
378 m->item_choice_data = item_choice_data;
Jason Hobbsb69bf522011-08-23 11:06:49 +0000379
380 if (title) {
381 m->title = strdup(title);
382 if (!m->title) {
383 free(m);
384 return NULL;
385 }
386 } else
387 m->title = NULL;
388
389
390 INIT_LIST_HEAD(&m->items);
391
392 return m;
393}
394
395/*
396 * menu_destroy() - frees the memory used by a menu and its items.
397 *
398 * m - Points to a menu created by menu_create().
399 *
400 * Returns 1 if successful, or -EINVAL if m is NULL.
401 */
402int menu_destroy(struct menu *m)
403{
404 if (!m)
405 return -EINVAL;
406
407 menu_items_iter(m, menu_item_destroy, NULL);
408
409 if (m->title)
410 free(m->title);
411
412 free(m);
413
414 return 1;
415}