source: mainline/uspace/app/bdsh/scli.c@ 43e02a6

/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the original program's authors nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "scli.h"
#include "input.h"
#include "util.h"
#include "errors.h"
#include "cmds/cmds.h"

/* See scli.h */
static cliuser_t usr;

/* Globals that are modified during start-up that modules/builtins
 * should be aware of. */
volatile unsigned int cli_quit = 0;
volatile unsigned int cli_interactive = 1;
volatile unsigned int cli_verbocity = 1;

/* The official name of this program
 * (change to your liking in configure.ac and re-run autoconf) */
const char *progname = PACKAGE_NAME;

/* These are not exposed, even to builtins */
static int cli_init(cliuser_t *usr);
static void cli_finit(cliuser_t *usr);

/* (re)allocates memory to store the current working directory, gets
 * and updates the current working directory, formats the prompt
 * string */
unsigned int cli_set_prompt(cliuser_t *usr)
{
        usr->prompt = (char *) realloc(usr->prompt, PATH_MAX);
        if (NULL == usr->prompt) {
                cli_error(CL_ENOMEM, "Can not allocate prompt");
                return 1;
        }
        memset(usr->prompt, 0, sizeof(usr->prompt));

        usr->cwd = (char *) realloc(usr->cwd, PATH_MAX);
        if (NULL == usr->cwd) {
                cli_error(CL_ENOMEM, "Can not allocate cwd");
                return 1;
        }
        memset(usr->cwd, 0, sizeof(usr->cwd));

        usr->cwd = getcwd(usr->cwd, PATH_MAX - 1);

        if (NULL == usr->cwd)
                snprintf(usr->cwd, PATH_MAX, "(unknown)");

        if (1 < cli_psprintf(&usr->prompt, "%s # ", usr->cwd)) {
                cli_error(cli_errno, "Failed to set prompt");
                return 1;
        }

        return 0;
}

/* Constructor */
static int cli_init(cliuser_t *usr)
{
        usr->line = (char *) NULL;
        usr->name = "root";
        usr->home = "/";
        usr->cwd = (char *) NULL;
        usr->prompt = (char *) NULL;
        chdir(usr->home);
        usr->lasterr = 0;
        return (int) cli_set_prompt(usr);
}

/* Destructor */
static void cli_finit(cliuser_t *usr)
{
        if (NULL != usr->line)
                free(usr->line);
        if (NULL != usr->prompt)
                free(usr->prompt);
        if (NULL != usr->cwd)
                free(usr->cwd);
}

int main(int argc, char *argv[])
{
        int ret = 0;
        int i = 0;

        if (cli_init(&usr))
                exit(EXIT_FAILURE);

        printf("Welcome to %s - %s\nType `help' at any time for usage information.\n",
                progname, PACKAGE_STRING);

        while (!cli_quit) {
                cli_set_prompt(&usr);
                get_input(&usr);
                if (NULL != usr.line) {
                        ret = tok_input(&usr);
                        usr.lasterr = ret;
                }
                i++;
        }
        goto finit;

finit:
        cli_finit(&usr);
        return ret;
}