source: mainline/uspace/fb/sysio.c@ d7e3f1ad

/*
 * Copyright (C) 2006 Ondrej Palkovsky
 * 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @defgroup sysio SysIO 
 * @brief       HelenOS framebuffer emulation via kernel.
 * @ingroup fbs
 * @{
 */ 
/** @file
 */

#include <async.h>
#include <ipc/fb.h>
#include <ipc/ipc.h>
#include <libc.h>
#include <errno.h>
#include <string.h>
#include <libc.h>
#include <stdio.h>

#include "sysio.h"

#define WIDTH 80
#define HEIGHT 25

/* Allow only 1 connection */
static int client_connected = 0;

static void sysput(char c)
{
        __SYSCALL3(SYS_IO, 1, (sysarg_t)&c, (sysarg_t) 1);
}

static void sysputs(char *s)
{
        while (*s) {
                sysput(*(s++));
        }
//      __SYSCALL3(SYS_IO, 1, (sysarg_t)s, strlen(s));
}

/** Send clearscreen sequence to console */
static void clrscr(void)
{
        sysputs("\033[2J");
}

/** Send ansi sequence to console to change cursor position */
static void curs_goto(unsigned int row, unsigned int col)
{
        char control[20];

        if (row > 200 || col > 200)
                return;

        snprintf(control, 20, "\033[%d;%df",row+1, col+1);
        sysputs(control);
}

static void set_style(int mode)
{
        char control[20];
        
        snprintf(control, 20, "\033[%dm", mode);
        sysputs(control);
}

static void scroll(int i)
{
        if (i > 0) {
                curs_goto(HEIGHT-1, 0);
                while (i--)
                        sysputs("\033D");
        } else if (i < 0) {
                curs_goto(0,0);
                while (i++)
                        sysputs("\033M");
        }
}

/** ANSI terminal emulation main thread */
static void sysio_client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        int retval;
        ipc_callid_t callid;
        ipc_call_t call;
        char c;
        int lastcol=0;
        int lastrow=0;
        int newcol,newrow;
        int fgcolor,bgcolor;
        int i;

        if (client_connected) {
                ipc_answer_fast(iid, ELIMIT, 0,0);
                return;
        }
        
        client_connected = 1;
        ipc_answer_fast(iid, 0, 0, 0); /* Accept connection */
        while (1) {
                callid = async_get_call(&call);
                switch (IPC_GET_METHOD(call)) {
                        case IPC_M_PHONE_HUNGUP:
                                client_connected = 0;
                                ipc_answer_fast(callid, 0, 0, 0);
                                return; /* Exit thread */
                        case FB_PUTCHAR:
                                c = IPC_GET_ARG1(call);
                                newrow = IPC_GET_ARG2(call);
                                newcol = IPC_GET_ARG3(call);
                                if ((lastcol != newcol) || (lastrow != newrow))
                                        curs_goto(newrow, newcol);
                                lastcol = newcol + 1;
                                lastrow = newrow;
                                sysput(c);
                                retval = 0;
                                break;
                        case FB_CURSOR_GOTO:
                                newrow = IPC_GET_ARG1(call);
                                newcol = IPC_GET_ARG2(call);
                                curs_goto(newrow, newcol);
                                lastrow = newrow;
                                lastcol = newcol;
                                retval = 0;
                                break;
                        case FB_GET_CSIZE:
                                ipc_answer_fast(callid, 0, HEIGHT, WIDTH);
                                continue;
                        case FB_CLEAR:
                                clrscr();
                                retval = 0;
                                break;
                        case FB_SET_STYLE:
                                fgcolor = IPC_GET_ARG1(call);
                                bgcolor = IPC_GET_ARG2(call);
                                if (fgcolor < bgcolor)
                                        set_style(0);
                                else
                                        set_style(7);
                                retval = 0;
                                break;
                        case FB_SCROLL:
                                i = IPC_GET_ARG1(call);
                                if ((i > HEIGHT) || (i < -HEIGHT)) {
                                        retval = EINVAL;
                                        break;
                                }
                                scroll(i);
                                curs_goto(lastrow, lastcol);
                                retval = 0;
                                break;
                        default:
                                retval = ENOENT;
                }
                
                ipc_answer_fast(callid, retval, 0, 0);
        }
}

/** ANSI terminal emulation initialization */
void sysio_init(void)
{
        async_set_client_connection(sysio_client_connection);
        clrscr();
        curs_goto(0,0);
        /* Set scrolling region to 0-25 lines */
        sysputs("\033[0;25r");
}

/**
 * @}
 */