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Jason Hobbsb69bf522011-08-23 11:06:49 +00001/*
2 * Copyright 2010-2011 Calxeda, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; either version 2 of the License, or (at your option)
7 * any later version.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <common.h>
19#include <malloc.h>
20#include <errno.h>
21#include <linux/list.h>
22
23#include "menu.h"
24
25/*
26 * Internally, each item in a menu is represented by a struct menu_item.
27 *
28 * These items will be alloc'd and initialized by menu_item_add and destroyed
29 * by menu_item_destroy, and the consumer of the interface never sees that
30 * this struct is used at all.
31 */
32struct menu_item {
33 char *key;
34 void *data;
35 struct list_head list;
36};
37
38/*
39 * The menu is composed of a list of items along with settings and callbacks
40 * provided by the user. An incomplete definition of this struct is available
41 * in menu.h, but the full definition is here to prevent consumers from
42 * relying on its contents.
43 */
44struct menu {
45 struct menu_item *default_item;
Jason Hobbsb41bc5a2011-08-23 11:06:50 +000046 int timeout;
Jason Hobbsb69bf522011-08-23 11:06:49 +000047 char *title;
48 int prompt;
49 void (*item_data_print)(void *);
Pali Rohárfc9d64f2013-03-23 14:50:40 +000050 char *(*item_choice)(void *);
51 void *item_choice_data;
Jason Hobbsb69bf522011-08-23 11:06:49 +000052 struct list_head items;
53};
54
55/*
56 * An iterator function for menu items. callback will be called for each item
57 * in m, with m, a pointer to the item, and extra being passed to callback. If
58 * callback returns a value other than NULL, iteration stops and the value
59 * return by callback is returned from menu_items_iter. This allows it to be
60 * used for search type operations. It is also safe for callback to remove the
61 * item from the list of items.
62 */
63static inline void *menu_items_iter(struct menu *m,
64 void *(*callback)(struct menu *, struct menu_item *, void *),
65 void *extra)
66{
67 struct list_head *pos, *n;
68 struct menu_item *item;
69 void *ret;
70
71 list_for_each_safe(pos, n, &m->items) {
72 item = list_entry(pos, struct menu_item, list);
73
74 ret = callback(m, item, extra);
75
76 if (ret)
77 return ret;
78 }
79
80 return NULL;
81}
82
83/*
84 * Print a menu_item. If the consumer provided an item_data_print function
85 * when creating the menu, call it with a pointer to the item's private data.
86 * Otherwise, print the key of the item.
87 */
88static inline void *menu_item_print(struct menu *m,
89 struct menu_item *item,
90 void *extra)
91{
Wolfgang Denkd887ad52011-11-28 20:19:41 +010092 if (!m->item_data_print) {
Anatolij Gustschin21574972011-12-03 06:46:07 +000093 puts(item->key);
Wolfgang Denkd887ad52011-11-28 20:19:41 +010094 putc('\n');
95 } else {
Jason Hobbsb69bf522011-08-23 11:06:49 +000096 m->item_data_print(item->data);
Wolfgang Denkd887ad52011-11-28 20:19:41 +010097 }
Jason Hobbsb69bf522011-08-23 11:06:49 +000098
99 return NULL;
100}
101
102/*
103 * Free the memory used by a menu item. This includes the memory used by its
104 * key.
105 */
106static inline void *menu_item_destroy(struct menu *m,
107 struct menu_item *item,
108 void *extra)
109{
110 if (item->key)
111 free(item->key);
112
113 free(item);
114
115 return NULL;
116}
117
Heiko Schochere0611dd2012-01-16 21:13:20 +0000118void __menu_display_statusline(struct menu *m)
119{
120 return;
121}
122void menu_display_statusline(struct menu *m)
123 __attribute__ ((weak, alias("__menu_display_statusline")));
124
Jason Hobbsb69bf522011-08-23 11:06:49 +0000125/*
126 * Display a menu so the user can make a choice of an item. First display its
127 * title, if any, and then each item in the menu.
128 */
129static inline void menu_display(struct menu *m)
130{
Wolfgang Denkd887ad52011-11-28 20:19:41 +0100131 if (m->title) {
132 puts(m->title);
133 putc('\n');
134 }
Heiko Schochere0611dd2012-01-16 21:13:20 +0000135 menu_display_statusline(m);
Jason Hobbsb69bf522011-08-23 11:06:49 +0000136
137 menu_items_iter(m, menu_item_print, NULL);
138}
139
140/*
141 * Check if an item's key matches a provided string, pointed to by extra. If
142 * extra is NULL, an item with a NULL key will match. Otherwise, the item's
143 * key has to match according to strcmp.
144 *
145 * This is called via menu_items_iter, so it returns a pointer to the item if
146 * the key matches, and returns NULL otherwise.
147 */
148static inline void *menu_item_key_match(struct menu *m,
149 struct menu_item *item, void *extra)
150{
151 char *item_key = extra;
152
153 if (!item_key || !item->key) {
154 if (item_key == item->key)
155 return item;
156
157 return NULL;
158 }
159
160 if (strcmp(item->key, item_key) == 0)
161 return item;
162
163 return NULL;
164}
165
166/*
167 * Find the first item with a key matching item_key, if any exists.
168 */
169static inline struct menu_item *menu_item_by_key(struct menu *m,
170 char *item_key)
171{
172 return menu_items_iter(m, menu_item_key_match, item_key);
173}
174
175/*
Jason Hobbsb69bf522011-08-23 11:06:49 +0000176 * Set *choice to point to the default item's data, if any default item was
177 * set, and returns 1. If no default item was set, returns -ENOENT.
178 */
179static inline int menu_default_choice(struct menu *m, void **choice)
180{
181 if (m->default_item) {
182 *choice = m->default_item->data;
183 return 1;
184 }
185
186 return -ENOENT;
187}
188
189/*
190 * Displays the menu and asks the user to choose an item. *choice will point
191 * to the private data of the item the user chooses. The user makes a choice
192 * by inputting a string matching the key of an item. Invalid choices will
193 * cause the user to be prompted again, repeatedly, until the user makes a
194 * valid choice. The user can exit the menu without making a choice via ^c.
195 *
196 * Returns 1 if the user made a choice, or -EINTR if they bail via ^c.
197 */
198static inline int menu_interactive_choice(struct menu *m, void **choice)
199{
200 char cbuf[CONFIG_SYS_CBSIZE];
201 struct menu_item *choice_item = NULL;
202 int readret;
203
204 while (!choice_item) {
205 cbuf[0] = '\0';
206
207 menu_display(m);
208
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000209 if (!m->item_choice) {
210 readret = readline_into_buffer("Enter choice: ", cbuf,
211 m->timeout / 10);
Jason Hobbsb69bf522011-08-23 11:06:49 +0000212
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000213 if (readret >= 0) {
214 choice_item = menu_item_by_key(m, cbuf);
215 if (!choice_item)
216 printf("%s not found\n", cbuf);
217 } else {
218 return menu_default_choice(m, choice);
Heiko Schocherfc4fa6a2012-01-16 22:24:29 +0000219 }
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000220 } else {
221 char *key = m->item_choice(m->item_choice_data);
222
223 if (key)
224 choice_item = menu_item_by_key(m, key);
225 }
226
227 if (!choice_item)
228 m->timeout = 0;
Jason Hobbsb69bf522011-08-23 11:06:49 +0000229 }
230
231 *choice = choice_item->data;
232
233 return 1;
234}
235
236/*
237 * menu_default_set() - Sets the default choice for the menu. This is safe to
238 * call more than once on a menu.
239 *
240 * m - Points to a menu created by menu_create().
241 *
242 * item_key - Points to a string that, when compared using strcmp, matches the
243 * key for an existing item in the menu.
244 *
245 * Returns 1 if successful, -EINVAL if m is NULL, or -ENOENT if no item with a
246 * key matching item_key is found.
247 */
248int menu_default_set(struct menu *m, char *item_key)
249{
250 struct menu_item *item;
251
252 if (!m)
253 return -EINVAL;
254
255 item = menu_item_by_key(m, item_key);
256
257 if (!item)
258 return -ENOENT;
259
260 m->default_item = item;
261
262 return 1;
263}
264
265/*
266 * menu_get_choice() - Returns the user's selected menu entry, or the default
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000267 * if the menu is set to not prompt or the timeout expires. This is safe to
268 * call more than once.
Jason Hobbsb69bf522011-08-23 11:06:49 +0000269 *
270 * m - Points to a menu created by menu_create().
271 *
272 * choice - Points to a location that will store a pointer to the selected
273 * menu item. If no item is selected or there is an error, no value will be
274 * written at the location it points to.
275 *
276 * Returns 1 if successful, -EINVAL if m or choice is NULL, -ENOENT if no
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000277 * default has been set and the menu is set to not prompt or the timeout
278 * expires, or -EINTR if the user exits the menu via ^c.
Jason Hobbsb69bf522011-08-23 11:06:49 +0000279 */
280int menu_get_choice(struct menu *m, void **choice)
281{
282 if (!m || !choice)
283 return -EINVAL;
284
Rob Herring85947532012-03-28 05:51:32 +0000285 if (!m->prompt)
Jason Hobbsb69bf522011-08-23 11:06:49 +0000286 return menu_default_choice(m, choice);
287
288 return menu_interactive_choice(m, choice);
289}
290
291/*
292 * menu_item_add() - Adds or replaces a menu item. Note that this replaces the
293 * data of an item if it already exists, but doesn't change the order of the
294 * item.
295 *
296 * m - Points to a menu created by menu_create().
297 *
298 * item_key - Points to a string that will uniquely identify the item. The
299 * string will be copied to internal storage, and is safe to discard after
300 * passing to menu_item_add.
301 *
302 * item_data - An opaque pointer associated with an item. It is never
303 * dereferenced internally, but will be passed to the item_data_print, and
304 * will be returned from menu_get_choice if the menu item is selected.
305 *
306 * Returns 1 if successful, -EINVAL if m is NULL, or -ENOMEM if there is
307 * insufficient memory to add the menu item.
308 */
309int menu_item_add(struct menu *m, char *item_key, void *item_data)
310{
311 struct menu_item *item;
312
313 if (!m)
314 return -EINVAL;
315
316 item = menu_item_by_key(m, item_key);
317
318 if (item) {
319 item->data = item_data;
320 return 1;
321 }
322
323 item = malloc(sizeof *item);
324 if (!item)
325 return -ENOMEM;
326
327 item->key = strdup(item_key);
328
329 if (!item->key) {
330 free(item);
331 return -ENOMEM;
332 }
333
334 item->data = item_data;
335
336 list_add_tail(&item->list, &m->items);
337
338 return 1;
339}
340
341/*
342 * menu_create() - Creates a menu handle with default settings
343 *
344 * title - If not NULL, points to a string that will be displayed before the
345 * list of menu items. It will be copied to internal storage, and is safe to
346 * discard after passing to menu_create().
347 *
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000348 * timeout - A delay in seconds to wait for user input. If 0, timeout is
349 * disabled, and the default choice will be returned unless prompt is 1.
350 *
351 * prompt - If 0, don't ask for user input unless there is an interrupted
352 * timeout. If 1, the user will be prompted for input regardless of the value
353 * of timeout.
Jason Hobbsb69bf522011-08-23 11:06:49 +0000354 *
355 * item_data_print - If not NULL, will be called for each item when the menu
356 * is displayed, with the pointer to the item's data passed as the argument.
357 * If NULL, each item's key will be printed instead. Since an item's key is
358 * what must be entered to select an item, the item_data_print function should
359 * make it obvious what the key for each entry is.
360 *
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000361 * item_choice - If not NULL, will be called when asking the user to choose an
362 * item. Returns a key string corresponding to the choosen item or NULL if
363 * no item has been selected.
364 *
365 * item_choice_data - Will be passed as the argument to the item_choice function
366 *
Jason Hobbsb69bf522011-08-23 11:06:49 +0000367 * Returns a pointer to the menu if successful, or NULL if there is
368 * insufficient memory available to create the menu.
369 */
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000370struct menu *menu_create(char *title, int timeout, int prompt,
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000371 void (*item_data_print)(void *),
372 char *(*item_choice)(void *),
373 void *item_choice_data)
Jason Hobbsb69bf522011-08-23 11:06:49 +0000374{
375 struct menu *m;
376
377 m = malloc(sizeof *m);
378
379 if (!m)
380 return NULL;
381
382 m->default_item = NULL;
383 m->prompt = prompt;
Jason Hobbsb41bc5a2011-08-23 11:06:50 +0000384 m->timeout = timeout;
Jason Hobbsb69bf522011-08-23 11:06:49 +0000385 m->item_data_print = item_data_print;
Pali Rohárfc9d64f2013-03-23 14:50:40 +0000386 m->item_choice = item_choice;
387 m->item_choice_data = item_choice_data;
Jason Hobbsb69bf522011-08-23 11:06:49 +0000388
389 if (title) {
390 m->title = strdup(title);
391 if (!m->title) {
392 free(m);
393 return NULL;
394 }
395 } else
396 m->title = NULL;
397
398
399 INIT_LIST_HEAD(&m->items);
400
401 return m;
402}
403
404/*
405 * menu_destroy() - frees the memory used by a menu and its items.
406 *
407 * m - Points to a menu created by menu_create().
408 *
409 * Returns 1 if successful, or -EINVAL if m is NULL.
410 */
411int menu_destroy(struct menu *m)
412{
413 if (!m)
414 return -EINVAL;
415
416 menu_items_iter(m, menu_item_destroy, NULL);
417
418 if (m->title)
419 free(m->title);
420
421 free(m);
422
423 return 1;
424}