diff options
| -rw-r--r-- | common/Makefile | 1 | ||||
| -rw-r--r-- | common/menu.c | 266 | ||||
| -rw-r--r-- | doc/README.menu | 158 | ||||
| -rw-r--r-- | include/menu.h | 30 |
4 files changed, 455 insertions, 0 deletions
diff --git a/common/Makefile b/common/Makefile index 224b7cc71..d5bd983be 100644 --- a/common/Makefile +++ b/common/Makefile @@ -170,6 +170,7 @@ COBJS-$(CONFIG_CMD_KGDB) += kgdb.o kgdb_stubs.o COBJS-$(CONFIG_KALLSYMS) += kallsyms.o COBJS-$(CONFIG_LCD) += lcd.o COBJS-$(CONFIG_LYNXKDI) += lynxkdi.o +COBJS-$(CONFIG_MENU) += menu.o COBJS-$(CONFIG_MODEM_SUPPORT) += modem.o COBJS-$(CONFIG_UPDATE_TFTP) += update.o COBJS-$(CONFIG_USB_KEYBOARD) += usb_kbd.o diff --git a/common/menu.c b/common/menu.c new file mode 100644 index 000000000..9bcd90609 --- /dev/null +++ b/common/menu.c @@ -0,0 +1,266 @@ +/* + * Copyright 2010-2011 Calxeda, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <common.h> +#include <malloc.h> +#include <errno.h> +#include <linux/list.h> + +#include "menu.h" + +struct menu_item { + char *key; + void *data; + struct list_head list; +}; + +struct menu { + struct menu_item *default_item; + char *title; + int prompt; + void (*item_data_print)(void *); + struct list_head 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; +} + +static inline void *menu_item_print(struct menu *m, + struct menu_item *item, + void *extra) +{ + if (!m->item_data_print) + printf("%s\n", item->key); + else + m->item_data_print(item->data); + + return NULL; +} + +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; +} + +static inline void menu_display(struct menu *m) +{ + if (m->title) + printf("%s:\n", m->title); + + menu_items_iter(m, menu_item_print, NULL); +} + +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; +} + +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); +} + +static inline int menu_use_default(struct menu *m) +{ + return !m->prompt; +} + +static inline int menu_default_choice(struct menu *m, void **choice) +{ + if (m->default_item) { + *choice = m->default_item->data; + return 1; + } + + return -ENOENT; +} + +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); + + readret = readline_into_buffer("Enter choice: ", cbuf); + + if (readret >= 0) { + choice_item = menu_item_by_key(m, cbuf); + + if (!choice_item) + printf("%s not found\n", cbuf); + } else { + printf("^C\n"); + return -EINTR; + } + } + + *choice = choice_item->data; + + return 1; +} + +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; +} + +int menu_get_choice(struct menu *m, void **choice) +{ + if (!m || !choice) + return -EINVAL; + + if (menu_use_default(m)) + return menu_default_choice(m, choice); + + return menu_interactive_choice(m, choice); +} + +/* + * note that this replaces the data of an item if it already exists, but + * doesn't change the order of the 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; +} + +struct menu *menu_create(char *title, int prompt, + void (*item_data_print)(void *)) +{ + struct menu *m; + + m = malloc(sizeof *m); + + if (!m) + return NULL; + + m->default_item = NULL; + m->prompt = prompt; + m->item_data_print = item_data_print; + + if (title) { + m->title = strdup(title); + if (!m->title) { + free(m); + return NULL; + } + } else + m->title = NULL; + + + INIT_LIST_HEAD(&m->items); + + return m; +} + +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; +} diff --git a/doc/README.menu b/doc/README.menu new file mode 100644 index 000000000..bca44be3f --- /dev/null +++ b/doc/README.menu @@ -0,0 +1,158 @@ +/* + * Copyright 2010-2011 Calxeda, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +U-boot provides a set of interfaces for creating and using simple, text +based menus. Menus are displayed as lists of labeled entries on the +console, and an entry can be selected by entering its label. + +To use the menu code, enable CONFIG_MENU, and include "menu.h" where +the interfaces should be available. + +Menus are composed of items. Each item has a key used to identify it in +the menu, and an opaque pointer to data controlled by the consumer. + +Interfaces +---------- +#include "menu.h" + +struct menu; + +struct menu *menu_create(char *title, int prompt, + void (*item_data_print)(void *)); +int menu_item_add(struct menu *m, char *item_key, void *item_data); +int menu_default_set(struct menu *m, char *item_key); +int menu_get_choice(struct menu *m, void **choice); +int menu_destroy(struct menu *m); + +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(). + + prompt - If 0, don't ask for user input. If 1, the user will be ed for + promptinput. + + 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. + + Returns a pointer to the menu if successful, or NULL if there is + insufficient memory available to create the menu. + + +menu_item_add() - Adds or replaces a menu 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. + + +menu_default_set() - Sets the default choice for the menu. This is safe +to call more than once. + + 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. + + +menu_get_choice() - Returns the user's selected menu entry, or the +default if the menu is set to not prompt. 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 -EINTR if + the user exits the menu via ctrl+c. + + +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. + + +Example +------- +This example creates a menu that always prompts, and allows the user +to pick from a list of tools. The item key and data are the same. + +#include "menu.h" + +char *tools[] = { + "Hammer", + "Screwdriver", + "Nail gun", + NULL +}; + +char *pick_a_tool(void) +{ + struct menu *m; + int i; + char *tool = NULL; + + m = menu_create("Tools", 1, NULL); + + for(i = 0; tools[i]; i++) { + if (menu_item_add(m, tools[i], tools[i]) != 1) { + printf("failed to add item!"); + menu_destroy(m); + return NULL; + } + } + + if (menu_get_choice(m, (void **)&tool) != 1) + printf("Problem picking tool!\n"); + + menu_destroy(m); + + return tool; +} + +void caller(void) +{ + char *tool = pick_a_tool(); + + if (tool) { + printf("picked a tool: %s\n", tool); + use_tool(tool); + } +} diff --git a/include/menu.h b/include/menu.h new file mode 100644 index 000000000..d47e1a029 --- /dev/null +++ b/include/menu.h @@ -0,0 +1,30 @@ +/* + * Copyright 2010-2011 Calxeda, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __MENU_H__ +#define __MENU_H__ + +struct menu; + +struct menu *menu_create(char *title, int prompt, + void (*item_data_print)(void *)); +int menu_default_set(struct menu *m, char *item_key); +int menu_get_choice(struct menu *m, void **choice); +int menu_item_add(struct menu *m, char *item_key, void *item_data); +int menu_destroy(struct menu *m); + +#endif /* __MENU_H__ */ |