523 lines
10 KiB
C
523 lines
10 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2017 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <ell/ell.h>
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#include <readline/readline.h>
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#include "command.h"
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#include "display.h"
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static struct l_queue *command_families;
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static enum cmd_status cmd_version(const char *entity, char *arg)
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{
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display("IWD version %s\n", VERSION);
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return CMD_STATUS_OK;
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}
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static enum cmd_status cmd_quit(const char *entity, char *arg)
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{
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display_quit();
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l_main_quit();
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return CMD_STATUS_OK;
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}
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static const struct command command_list[] = {
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{ NULL, "version", NULL, cmd_version, "Display version" },
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{ NULL, "quit", NULL, cmd_quit, "Quit program" },
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{ NULL, "exit", NULL, cmd_quit },
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{ NULL, "help" },
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{ }
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};
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static char *cmd_generator(const char *text, int state)
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{
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static const struct l_queue_entry *entry;
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static size_t index;
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static size_t len;
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const char *cmd;
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if (!state) {
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len = strlen(text);
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index = 0;
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entry = l_queue_get_entries(command_families);
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}
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while (entry) {
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const struct command_family *family = entry->data;
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entry = entry->next;
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if (strncmp(family->name, text, len))
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continue;
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return l_strdup(family->name);
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}
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while ((cmd = command_list[index].cmd)) {
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index++;
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if (strncmp(cmd, text, len))
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continue;
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return l_strdup(cmd);
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}
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return NULL;
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}
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static bool cmd_completion_cmd_has_arg(const char *cmd,
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const struct command_family *family)
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{
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size_t i;
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char **matches = NULL;
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bool status;
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for (i = 0; family->command_list[i].cmd; i++) {
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if (strcmp(family->command_list[i].cmd, cmd))
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continue;
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return family->command_list[i].arg ? true : false;
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}
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if (!family->family_arg_completion)
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return false;
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matches = rl_completion_matches(cmd, family->family_arg_completion);
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if (!matches)
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return false;
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status = false;
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for (i = 0; matches[i]; i++) {
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if (strcmp(matches[i], cmd))
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continue;
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status = true;
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break;
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}
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l_strfreev(matches);
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return status;
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}
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static bool find_next_token(int *i, const char *token, int token_len)
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{
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char *line = rl_line_buffer;
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while (*i && line[*i] == ' ')
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(*i)--;
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while (*i && line[*i] != ' ')
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(*i)--;
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return !strncmp(line + (line[*i] == ' ' ? *i + 1 : *i),
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token, token_len);
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}
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bool command_line_find_token(const char *token, uint8_t num_to_inspect)
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{
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int i = rl_point - 1;
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int len = strlen(token);
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if (!len)
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return false;
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while (i && num_to_inspect) {
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if (find_next_token(&i, token, len))
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return true;
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num_to_inspect--;
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}
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return false;
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}
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static char **cmd_completion_match_entity_cmd(const char *cmd, const char *text,
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const struct command *cmd_list)
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{
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char **matches = NULL;
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size_t i;
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for (i = 0; cmd_list[i].cmd; i++) {
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if (strcmp(cmd_list[i].cmd, cmd))
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continue;
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if (!cmd_list[i].completion)
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break;
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matches = rl_completion_matches(text, cmd_list[i].completion);
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break;
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}
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return matches;
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}
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static char **cmd_completion_match_family_cmd(const char *cmd_family,
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char *args, const char *text,
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bool ends_with_space)
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{
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const struct l_queue_entry *entry;
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const char *arg1;
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const char *arg2;
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const char *arg3;
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char **matches = NULL;
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for (entry = l_queue_get_entries(command_families); entry;
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entry = entry->next) {
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const struct command_family *family = entry->data;
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if (strcmp(family->name, cmd_family))
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continue;
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arg1 = strtok_r(NULL, " ", &args);
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if (!arg1) {
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if (!family->family_arg_completion)
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break;
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matches = rl_completion_matches(text,
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family->family_arg_completion);
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break;
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}
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arg2 = strtok_r(NULL, " ", &args);
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if (!arg2 && !ends_with_space) {
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if (!family->family_arg_completion)
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break;
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matches = rl_completion_matches(text,
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family->family_arg_completion);
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break;
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} else if (!arg2 && ends_with_space) {
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if (!cmd_completion_cmd_has_arg(arg1, family))
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break;
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if (!family->entity_arg_completion)
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break;
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matches = rl_completion_matches(text,
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family->entity_arg_completion);
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break;
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}
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arg3 = strtok_r(NULL, " ", &args);
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if (!arg3 && !ends_with_space) {
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if (!family->entity_arg_completion)
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break;
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matches = rl_completion_matches(text,
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family->entity_arg_completion);
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break;
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}
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if (family->set_default_entity)
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family->set_default_entity(arg1);
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matches = cmd_completion_match_entity_cmd(arg2, text,
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family->command_list);
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break;
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}
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return matches;
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}
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char **command_completion(const char *text, int start, int end)
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{
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char **matches = NULL;
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const char *family;
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char *args = NULL;
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char *prompt = NULL;
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bool ends_with_space = false;
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if (display_agent_is_active()) {
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rl_attempted_completion_over = 1;
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return NULL;
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}
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if (!start) {
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matches = rl_completion_matches(text, cmd_generator);
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goto done;
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}
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prompt = rl_copy_text(0, rl_end);
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family = strtok_r(prompt, " ", &args);
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if (!family)
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goto done;
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if (args) {
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int len = strlen(args);
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if (len > 0 && args[len - 1] == ' ')
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ends_with_space = true;
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}
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matches = cmd_completion_match_family_cmd(family, args, text,
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ends_with_space);
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done:
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l_free(prompt);
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if (!matches)
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rl_attempted_completion_over = 1;
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return matches;
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}
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char *command_entity_arg_completion(const char *text, int state,
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const struct command *command_list)
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{
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static size_t index;
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static size_t len;
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const char *cmd;
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if (!state) {
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index = 0;
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len = strlen(text);
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}
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while ((cmd = command_list[index].cmd)) {
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if (!command_list[index++].entity)
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continue;
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if (strncmp(cmd, text, len))
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continue;
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return l_strdup(cmd);
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}
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return NULL;
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}
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static void execute_cmd(const char *family, const char *entity,
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const struct command *cmd, char *args)
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{
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enum cmd_status status;
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display_refresh_set_cmd(family, entity, cmd, args);
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status = cmd->function(entity, args);
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if (status != CMD_STATUS_OK)
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goto error;
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if (cmd->refreshable)
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display_refresh_timeout_set();
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return;
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error:
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switch (status) {
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case CMD_STATUS_INVALID_ARGS:
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display("Invalid command. Use the following pattern:\n");
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display_command_line(family, cmd);
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break;
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case CMD_STATUS_INVALID_VALUE:
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break;
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case CMD_STATUS_UNSUPPORTED:
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display_refresh_reset();
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display("Unsupported command\n");
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break;
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case CMD_STATUS_FAILED:
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l_main_quit();
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break;
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default:
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l_error("Unknown command status.");
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}
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}
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static bool match_cmd(const char *family, const char *entity, const char *cmd,
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char *args, const struct command *command_list)
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{
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size_t i;
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for (i = 0; command_list[i].cmd; i++) {
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if (strcmp(command_list[i].cmd, cmd))
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continue;
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if (!command_list[i].function)
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goto nomatch;
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execute_cmd(family, entity, &command_list[i], args);
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return true;
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}
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nomatch:
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return false;
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}
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static bool match_cmd_family(const char *cmd_family, char *arg)
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{
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const struct l_queue_entry *entry;
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const char *arg1;
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const char *arg2;
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for (entry = l_queue_get_entries(command_families); entry;
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entry = entry->next) {
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const struct command_family *family = entry->data;
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if (strcmp(family->name, cmd_family))
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continue;
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arg1 = strtok_r(NULL, " ", &arg);
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if (!arg1)
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goto nomatch;
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if (match_cmd(family->name, NULL, arg1, arg,
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family->command_list))
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return true;
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arg2 = strtok_r(NULL, " ", &arg);
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if (!arg2)
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goto nomatch;
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if (!match_cmd(family->name, arg1, arg2, arg,
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family->command_list))
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goto nomatch;
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return true;
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}
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nomatch:
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return false;
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}
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static void list_commands(const char *command_family,
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const struct command *cmd_list)
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{
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size_t i;
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for (i = 0; cmd_list[i].cmd; i++) {
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if (!cmd_list[i].desc)
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continue;
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display_command_line(command_family, &cmd_list[i]);
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}
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}
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static void list_cmd_families(void)
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{
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const struct l_queue_entry *entry;
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for (entry = l_queue_get_entries(command_families); entry;
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entry = entry->next) {
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const struct command_family *family = entry->data;
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display("\n%s:\n", family->caption);
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list_commands(family->name, family->command_list);
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}
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}
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void command_process_prompt(char *prompt)
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{
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const char *cmd;
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char *arg = NULL;
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cmd = strtok_r(prompt, " ", &arg);
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if (!cmd)
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return;
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if (match_cmd_family(cmd, arg))
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return;
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display_refresh_reset();
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if (match_cmd(NULL, NULL, cmd, arg, command_list))
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return;
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if (strcmp(cmd, "help")) {
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display("Invalid command\n");
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return;
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}
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display_table_header("Available commands", MARGIN "%-*s%-*s",
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50, "Commands", 28, "Description");
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list_cmd_families();
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display("\nMiscellaneous:\n");
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list_commands(NULL, command_list);
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}
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void command_family_register(const struct command_family *family)
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{
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l_queue_push_tail(command_families, (void *) family);
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}
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void command_family_unregister(const struct command_family *family)
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{
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l_queue_remove(command_families, (void *) family);
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}
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extern struct command_family_desc __start___command[];
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extern struct command_family_desc __stop___command[];
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void command_init(void)
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{
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struct command_family_desc *desc;
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command_families = l_queue_new();
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for (desc = __start___command; desc < __stop___command; desc++) {
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if (!desc->init)
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continue;
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desc->init();
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}
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}
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void command_exit(void)
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{
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struct command_family_desc *desc;
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for (desc = __start___command; desc < __stop___command; desc++) {
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if (!desc->exit)
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continue;
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desc->exit();
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}
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l_queue_destroy(command_families, NULL);
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command_families = NULL;
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}
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