Subversion Repositories HelenOS

/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
 * All rights reserved.
 * Copyright (c) 2008, Jiri Svoboda - 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 <io/stream.h>
#include <console.h>

#include "config.h"
#include "util.h"
#include "scli.h"
#include "input.h"
#include "errors.h"
#include "exec.h"

extern volatile unsigned int cli_interactive;

/* Not exposed in input.h */
static void cli_restricted(char *);
static void read_line(char *, int);

/* More than a macro than anything */
static void cli_restricted(char *cmd)
{
    printf("%s is not available in %s mode\n", cmd,
        cli_interactive ? "interactive" : "non-interactive");

    return;
}

/* Tokenizes input from console, sees if the first word is a built-in, if so
 * invokes the built-in entry point (a[0]) passing all arguments in a[] to
 * the handler */
int tok_input(cliuser_t *usr)
{
    char *cmd[WORD_MAX];
    int n = 0, i = 0;
    int rc = 0;
    char *tmp;

    if (NULL == usr->line)
        return CL_EFAIL;

    tmp = cli_strdup(usr->line);

    cmd[n] = cli_strtok(tmp, " ");
    while (cmd[n] && n < WORD_MAX) {
        cmd[++n] = cli_strtok(NULL, " ");
    }

    /* We have rubbish */
    if (NULL == cmd[0]) {
        rc = CL_ENOENT;
        goto finit;
    }

    /* Its a builtin command ? */
    if ((i = (is_builtin(cmd[0]))) > -1) {
        rc = run_builtin(i, cmd, usr);
        goto finit;
    /* Its a module ? */
    } else if ((i = (is_module(cmd[0]))) > -1) {
        rc = run_module(i, cmd);
        goto finit;
    }

    /* See what try_exec thinks of it */
    rc = try_exec(cmd[0], cmd);

finit:
    if (NULL != usr->line) {
        free(usr->line);
        usr->line = (char *) NULL;
    }
    if (NULL != tmp)
        free(tmp);

    return rc;
}

/* Borrowed from Jiri Svoboda's 'cli' uspace app */
static void read_line(char *buffer, int n)
{
    char c;
    int chars;

    chars = 0;
    while (chars < n - 1) {
        c = getchar();
        if (c < 0)
            return;
        if (c == '\n')
            break;
        if (c == '\b') {
            if (chars > 0) {
                putchar('\b');
                --chars;
            }
            continue;
        }
        putchar(c);
        buffer[chars++] = c;
    }
    putchar('\n');
    buffer[chars] = '\0';
}

/* TODO:
 * Implement something like editline() / readline(), if even
 * just for command history and making arrows work. */
void get_input(cliuser_t *usr)
{
    char line[INPUT_MAX];
    size_t len = 0;

    console_set_style(STYLE_EMPHASIS);
    printf("%s", usr->prompt);
    console_set_style(STYLE_NORMAL);

    read_line(line, INPUT_MAX);
    len = strlen(line);
    /* Make sure we don't have rubbish or a C/R happy user */
    if (len == 0 || line[0] == '\n')
        return;
    usr->line = cli_strdup(line);

    return;
}