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112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/******************************************************************************
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Copyright 2009, Freie Universitaet Berlin (FUB). All rights reserved.
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These sources were developed at the Freie Universitaet Berlin, Computer Systems
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and Telematics group (http://cst.mi.fu-berlin.de).
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-------------------------------------------------------------------------------
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This file is part of FeuerWare.
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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FeuerWare is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see http://www.gnu.org/licenses/ .
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--------------------------------------------------------------------------------
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For further information and questions please use the web site
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http://scatterweb.mi.fu-berlin.de
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and the mailinglist (subscription via web site)
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scatterweb@lists.spline.inf.fu-berlin.de
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*******************************************************************************/
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/**
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* @ingroup shell
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* @{
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*/
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/**
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* @file
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* @brief Implementation of a very simple command interpreter.
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* For each command (i.e. "echo"), a handler can be specified.
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* If the first word of a user-entered command line matches the
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* name of a handler, the handler will be called with the whole
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* command line as parameter.
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*
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* @author Freie Universität Berlin, Computer Systems & Telematics
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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*/
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#include <sys/unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <malloc.h>
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#include <stdlib.h>
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#include <hash_string.h>
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#include <shell.h>
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static void handle_input_line(shell_t *shell, char* line) {
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char* saveptr;
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char* command = strtok_r(line, " ", &saveptr);
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void (*handler)(char*) = NULL;
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if (command) {
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handler = hashtable_search(shell->h, command);
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if (handler) {
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handler(line);
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} else {
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printf("shell: command not found.\n");
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}
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}
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free(line);
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}
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void shell_run(shell_t *shell) {
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char line_buf[255];
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char *line_buf_ptr = line_buf;
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int c;
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while(1) {
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write(STDOUT_FILENO, ">", 1);
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while (1) {
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if ( (line_buf_ptr - line_buf) >= (sizeof(line_buf)-1)) {
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printf("\nshell: input too long.\n");
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line_buf_ptr = line_buf;
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}
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c = shell->readchar();
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write(STDOUT_FILENO, &c, 1);
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if (c == 13) continue;
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if (c == 10) {
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*line_buf_ptr = '\0';
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handle_input_line(shell, strdup(line_buf));
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line_buf_ptr = line_buf;
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break;
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} else {
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*line_buf_ptr++ = c;
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}
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}
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}
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}
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void shell_init(shell_t *shell, int(*readchar)(void)) {
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shell->h = create_hashtable(16, (unsigned int (*)(void*)) hash_string, (int (*) (void*,void*)) cmp_string);
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shell->readchar = readchar;
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}
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void shell_register_cmd(shell_t *shell, char* name, void (*handler)(char* args)) {
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hashtable_insert(shell->h, name, handler);
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}
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/** @} */
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