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 <kbd/kbd.h>
#include <kbd/keycode.h>
#include <errno.h>
#include <bool.h>

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

static void read_line(char *, int);

/* 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 = str_dup(usr->line);

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

static void read_line(char *buffer, int n)
{
    kbd_event_t ev;
    size_t offs, otmp;
    wchar_t dec;

    offs = 0;
    while (true) {
        fflush(stdout);
        if (kbd_get_event(&ev) < 0)
            return;
        if (ev.type == KE_RELEASE)
            continue;

        if (ev.key == KC_ENTER || ev.key == KC_NENTER)
            break;
        if (ev.key == KC_BACKSPACE) {
            if (offs > 0) {
                /*
                 * Back up until we reach valid start of
                 * character.
                 */
                while (offs > 0) {
                    --offs; otmp = offs;
                    dec = str_decode(buffer, &otmp, n);
                    if (dec != U_SPECIAL)
                        break;
                }
                putchar('\b');
            }
            continue;
        }
        if (ev.c >= ' ') {
            //putchar(ev.c);
            if (chr_encode(ev.c, buffer, &offs, n - 1) == EOK)
                console_putchar(ev.c);
        }
    }
    putchar('\n');
    buffer[offs] = '\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];

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

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

    return;
}