Archipelago » qemu

/*

 * QEMU graphical console

 *

 * Copyright (c) 2004 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu-common.h"

#include "ui/console.h"

#include "qemu/timer.h"

#include "qmp-commands.h"

#include "sysemu/char.h"

//#define DEBUG_CONSOLE

#define DEFAULT_BACKSCROLL 512

#define MAX_CONSOLES 12

#define CONSOLE_CURSOR_PERIOD 500

#define QEMU_RGBA(r, g, b, a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))

#define QEMU_RGB(r, g, b) QEMU_RGBA(r, g, b, 0xff)

typedef struct TextAttributes {

    uint8_t fgcol:4;

    uint8_t bgcol:4;

    uint8_t bold:1;

    uint8_t uline:1;

    uint8_t blink:1;

    uint8_t invers:1;

    uint8_t unvisible:1;

} TextAttributes;

typedef struct TextCell {

    uint8_t ch;

    TextAttributes t_attrib;

} TextCell;

#define MAX_ESC_PARAMS 3

enum TTYState {

    TTY_STATE_NORM,

    TTY_STATE_ESC,

    TTY_STATE_CSI,

};

typedef struct QEMUFIFO {

    uint8_t *buf;

    int buf_size;

    int count, wptr, rptr;

} QEMUFIFO;

static int qemu_fifo_write(QEMUFIFO *f, const uint8_t *buf, int len1)

{

    int l, len;

    l = f->buf_size - f->count;

    if (len1 > l)

        len1 = l;

    len = len1;

    while (len > 0) {

        l = f->buf_size - f->wptr;

        if (l > len)

            l = len;

        memcpy(f->buf + f->wptr, buf, l);

        f->wptr += l;

        if (f->wptr >= f->buf_size)

            f->wptr = 0;

        buf += l;

        len -= l;

    }

    f->count += len1;

    return len1;

}

static int qemu_fifo_read(QEMUFIFO *f, uint8_t *buf, int len1)

{

    int l, len;

    if (len1 > f->count)

        len1 = f->count;

    len = len1;

    while (len > 0) {

        l = f->buf_size - f->rptr;

        if (l > len)

            l = len;

        memcpy(buf, f->buf + f->rptr, l);

        f->rptr += l;

        if (f->rptr >= f->buf_size)

            f->rptr = 0;

        buf += l;

        len -= l;

    }

    f->count -= len1;

    return len1;

}

typedef enum {

    GRAPHIC_CONSOLE,

    TEXT_CONSOLE,

    TEXT_CONSOLE_FIXED_SIZE

} console_type_t;

struct QemuConsole {

    int index;

    console_type_t console_type;

    DisplayState *ds;

    /* Graphic console state.  */

    vga_hw_update_ptr hw_update;

    vga_hw_invalidate_ptr hw_invalidate;

    vga_hw_screen_dump_ptr hw_screen_dump;

    vga_hw_text_update_ptr hw_text_update;

    void *hw;

    int g_width, g_height;

    /* Text console state */

    int width;

    int height;

    int total_height;

    int backscroll_height;

    int x, y;

    int x_saved, y_saved;

    int y_displayed;

    int y_base;

    TextAttributes t_attrib_default; /* default text attributes */

    TextAttributes t_attrib; /* currently active text attributes */

    TextCell *cells;

    int text_x[2], text_y[2], cursor_invalidate;

    int echo;

    bool cursor_visible_phase;

    QEMUTimer *cursor_timer;

    int update_x0;

    int update_y0;

    int update_x1;

    int update_y1;

    enum TTYState state;

    int esc_params[MAX_ESC_PARAMS];

    int nb_esc_params;

    CharDriverState *chr;

    /* fifo for key pressed */

    QEMUFIFO out_fifo;

    uint8_t out_fifo_buf[16];

    QEMUTimer *kbd_timer;

};

static DisplayState *display_state;

static QemuConsole *active_console;

static QemuConsole *consoles[MAX_CONSOLES];

static int nb_consoles = 0;

void vga_hw_update(void)

{

    if (active_console && active_console->hw_update)

        active_console->hw_update(active_console->hw);

}

void vga_hw_invalidate(void)

{

    if (active_console && active_console->hw_invalidate)

        active_console->hw_invalidate(active_console->hw);

}

void qmp_screendump(const char *filename, Error **errp)

{

    QemuConsole *previous_active_console;

    bool cswitch;

    previous_active_console = active_console;

    cswitch = previous_active_console && previous_active_console->index != 0;

    /* There is currently no way of specifying which screen we want to dump,

       so always dump the first one.  */

    if (cswitch) {

        console_select(0);

    }

    if (consoles[0] && consoles[0]->hw_screen_dump) {

        consoles[0]->hw_screen_dump(consoles[0]->hw, filename, cswitch, errp);

    } else {

        error_setg(errp, "device doesn't support screendump");

    }

    if (cswitch) {

        console_select(previous_active_console->index);

    }

}

void vga_hw_text_update(console_ch_t *chardata)

{

    if (active_console && active_console->hw_text_update)

        active_console->hw_text_update(active_console->hw, chardata);

}

static void vga_fill_rect(QemuConsole *con,

                          int posx, int posy, int width, int height,

                          uint32_t color)

{

    DisplaySurface *surface = qemu_console_surface(con);

    uint8_t *d, *d1;

    int x, y, bpp;

    bpp = surface_bytes_per_pixel(surface);

    d1 = surface_data(surface) +

        surface_stride(surface) * posy + bpp * posx;

    for (y = 0; y < height; y++) {

        d = d1;

        switch(bpp) {

        case 1:

            for (x = 0; x < width; x++) {

                *((uint8_t *)d) = color;

                d++;

            }

            break;

        case 2:

            for (x = 0; x < width; x++) {

                *((uint16_t *)d) = color;

                d += 2;

            }

            break;

        case 4:

            for (x = 0; x < width; x++) {

                *((uint32_t *)d) = color;

                d += 4;

            }

            break;

        }

        d1 += surface_stride(surface);

    }

}

/* copy from (xs, ys) to (xd, yd) a rectangle of size (w, h) */

static void vga_bitblt(QemuConsole *con,

                       int xs, int ys, int xd, int yd, int w, int h)

{

    DisplaySurface *surface = qemu_console_surface(con);

    const uint8_t *s;

    uint8_t *d;

    int wb, y, bpp;

    bpp = surface_bytes_per_pixel(surface);

    wb = w * bpp;

    if (yd <= ys) {

        s = surface_data(surface) +

            surface_stride(surface) * ys + bpp * xs;

        d = surface_data(surface) +

            surface_stride(surface) * yd + bpp * xd;

        for (y = 0; y < h; y++) {

            memmove(d, s, wb);

            d += surface_stride(surface);

            s += surface_stride(surface);

        }

    } else {

        s = surface_data(surface) +

            surface_stride(surface) * (ys + h - 1) + bpp * xs;

        d = surface_data(surface) +

            surface_stride(surface) * (yd + h - 1) + bpp * xd;

       for (y = 0; y < h; y++) {

            memmove(d, s, wb);

            d -= surface_stride(surface);

            s -= surface_stride(surface);

        }

    }

}

/***********************************************************/

/* basic char display */

#define FONT_HEIGHT 16

#define FONT_WIDTH 8

#include "vgafont.h"

#define cbswap_32(__x) \

((uint32_t)( \

                (((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \

                (((uint32_t)(__x) & (uint32_t)0x0000ff00UL) <<  8) | \

                (((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >>  8) | \

                (((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) ))

#ifdef HOST_WORDS_BIGENDIAN

#define PAT(x) x

#else

#define PAT(x) cbswap_32(x)

#endif

static const uint32_t dmask16[16] = {

    PAT(0x00000000),

    PAT(0x000000ff),

    PAT(0x0000ff00),

    PAT(0x0000ffff),

    PAT(0x00ff0000),

    PAT(0x00ff00ff),

    PAT(0x00ffff00),

    PAT(0x00ffffff),

    PAT(0xff000000),

    PAT(0xff0000ff),

    PAT(0xff00ff00),

    PAT(0xff00ffff),

    PAT(0xffff0000),

    PAT(0xffff00ff),

    PAT(0xffffff00),

    PAT(0xffffffff),

};

static const uint32_t dmask4[4] = {

    PAT(0x00000000),

    PAT(0x0000ffff),

    PAT(0xffff0000),

    PAT(0xffffffff),

};

#ifndef CONFIG_CURSES

enum color_names {

    COLOR_BLACK   = 0,

    COLOR_RED     = 1,

    COLOR_GREEN   = 2,

    COLOR_YELLOW  = 3,

    COLOR_BLUE    = 4,

    COLOR_MAGENTA = 5,

    COLOR_CYAN    = 6,

    COLOR_WHITE   = 7

};

#endif

static const uint32_t color_table_rgb[2][8] = {

    {   /* dark */

        QEMU_RGB(0x00, 0x00, 0x00),  /* black */

        QEMU_RGB(0xaa, 0x00, 0x00),  /* red */

        QEMU_RGB(0x00, 0xaa, 0x00),  /* green */

        QEMU_RGB(0xaa, 0xaa, 0x00),  /* yellow */

        QEMU_RGB(0x00, 0x00, 0xaa),  /* blue */

        QEMU_RGB(0xaa, 0x00, 0xaa),  /* magenta */

        QEMU_RGB(0x00, 0xaa, 0xaa),  /* cyan */

        QEMU_RGB(0xaa, 0xaa, 0xaa),  /* white */

    },

    {   /* bright */

        QEMU_RGB(0x00, 0x00, 0x00),  /* black */

        QEMU_RGB(0xff, 0x00, 0x00),  /* red */

        QEMU_RGB(0x00, 0xff, 0x00),  /* green */

        QEMU_RGB(0xff, 0xff, 0x00),  /* yellow */

        QEMU_RGB(0x00, 0x00, 0xff),  /* blue */

        QEMU_RGB(0xff, 0x00, 0xff),  /* magenta */

        QEMU_RGB(0x00, 0xff, 0xff),  /* cyan */

        QEMU_RGB(0xff, 0xff, 0xff),  /* white */

    }

};

#ifdef DEBUG_CONSOLE

static void console_print_text_attributes(TextAttributes *t_attrib, char ch)

{

    if (t_attrib->bold) {

        printf("b");

    } else {

        printf(" ");

    }

    if (t_attrib->uline) {

        printf("u");

    } else {

        printf(" ");

    }

    if (t_attrib->blink) {

        printf("l");

    } else {

        printf(" ");

    }

    if (t_attrib->invers) {

        printf("i");

    } else {

        printf(" ");

    }

    if (t_attrib->unvisible) {

        printf("n");

    } else {

        printf(" ");

    }

    printf(" fg: %d bg: %d ch:'%2X' '%c'\n", t_attrib->fgcol, t_attrib->bgcol, ch, ch);

}

#endif

static void vga_putcharxy(QemuConsole *s, int x, int y, int ch,

                          TextAttributes *t_attrib)

{

    DisplaySurface *surface = qemu_console_surface(s);

    uint8_t *d;

    const uint8_t *font_ptr;

    unsigned int font_data, linesize, xorcol, bpp;

    int i;

    unsigned int fgcol, bgcol;

#ifdef DEBUG_CONSOLE

    printf("x: %2i y: %2i", x, y);

    console_print_text_attributes(t_attrib, ch);

#endif

    if (t_attrib->invers) {

        bgcol = color_table_rgb[t_attrib->bold][t_attrib->fgcol];

        fgcol = color_table_rgb[t_attrib->bold][t_attrib->bgcol];

    } else {

        fgcol = color_table_rgb[t_attrib->bold][t_attrib->fgcol];

        bgcol = color_table_rgb[t_attrib->bold][t_attrib->bgcol];

    }

    bpp = surface_bytes_per_pixel(surface);

    d = surface_data(surface) +

        surface_stride(surface) * y * FONT_HEIGHT + bpp * x * FONT_WIDTH;

    linesize = surface_stride(surface);

    font_ptr = vgafont16 + FONT_HEIGHT * ch;

    xorcol = bgcol ^ fgcol;

    switch (surface_bits_per_pixel(surface)) {

    case 8:

        for(i = 0; i < FONT_HEIGHT; i++) {

            font_data = *font_ptr++;

            if (t_attrib->uline

                && ((i == FONT_HEIGHT - 2) || (i == FONT_HEIGHT - 3))) {

                font_data = 0xFF;

            }

            ((uint32_t *)d)[0] = (dmask16[(font_data >> 4)] & xorcol) ^ bgcol;

            ((uint32_t *)d)[1] = (dmask16[(font_data >> 0) & 0xf] & xorcol) ^ bgcol;

            d += linesize;

        }

        break;

    case 16:

    case 15:

        for(i = 0; i < FONT_HEIGHT; i++) {

            font_data = *font_ptr++;

            if (t_attrib->uline

                && ((i == FONT_HEIGHT - 2) || (i == FONT_HEIGHT - 3))) {

                font_data = 0xFF;

            }

            ((uint32_t *)d)[0] = (dmask4[(font_data >> 6)] & xorcol) ^ bgcol;

            ((uint32_t *)d)[1] = (dmask4[(font_data >> 4) & 3] & xorcol) ^ bgcol;

            ((uint32_t *)d)[2] = (dmask4[(font_data >> 2) & 3] & xorcol) ^ bgcol;

            ((uint32_t *)d)[3] = (dmask4[(font_data >> 0) & 3] & xorcol) ^ bgcol;

            d += linesize;

        }

        break;

    case 32:

        for(i = 0; i < FONT_HEIGHT; i++) {

            font_data = *font_ptr++;

            if (t_attrib->uline && ((i == FONT_HEIGHT - 2) || (i == FONT_HEIGHT - 3))) {

                font_data = 0xFF;

            }

            ((uint32_t *)d)[0] = (-((font_data >> 7)) & xorcol) ^ bgcol;

            ((uint32_t *)d)[1] = (-((font_data >> 6) & 1) & xorcol) ^ bgcol;

            ((uint32_t *)d)[2] = (-((font_data >> 5) & 1) & xorcol) ^ bgcol;

            ((uint32_t *)d)[3] = (-((font_data >> 4) & 1) & xorcol) ^ bgcol;

            ((uint32_t *)d)[4] = (-((font_data >> 3) & 1) & xorcol) ^ bgcol;

            ((uint32_t *)d)[5] = (-((font_data >> 2) & 1) & xorcol) ^ bgcol;

            ((uint32_t *)d)[6] = (-((font_data >> 1) & 1) & xorcol) ^ bgcol;

            ((uint32_t *)d)[7] = (-((font_data >> 0) & 1) & xorcol) ^ bgcol;

            d += linesize;

        }

        break;

    }

}

static void text_console_resize(QemuConsole *s)

{

    TextCell *cells, *c, *c1;

    int w1, x, y, last_width;

    last_width = s->width;

    s->width = s->g_width / FONT_WIDTH;

    s->height = s->g_height / FONT_HEIGHT;

    w1 = last_width;

    if (s->width < w1)

        w1 = s->width;

    cells = g_malloc(s->width * s->total_height * sizeof(TextCell));

    for(y = 0; y < s->total_height; y++) {

        c = &cells[y * s->width];

        if (w1 > 0) {

            c1 = &s->cells[y * last_width];

            for(x = 0; x < w1; x++) {

                *c++ = *c1++;

            }

        }

        for(x = w1; x < s->width; x++) {

            c->ch = ' ';

            c->t_attrib = s->t_attrib_default;

            c++;

        }

    }

    g_free(s->cells);

    s->cells = cells;

}

static inline void text_update_xy(QemuConsole *s, int x, int y)

{

    s->text_x[0] = MIN(s->text_x[0], x);

    s->text_x[1] = MAX(s->text_x[1], x);

    s->text_y[0] = MIN(s->text_y[0], y);

    s->text_y[1] = MAX(s->text_y[1], y);

}

static void invalidate_xy(QemuConsole *s, int x, int y)

{

    if (s->update_x0 > x * FONT_WIDTH)

        s->update_x0 = x * FONT_WIDTH;

    if (s->update_y0 > y * FONT_HEIGHT)

        s->update_y0 = y * FONT_HEIGHT;

    if (s->update_x1 < (x + 1) * FONT_WIDTH)

        s->update_x1 = (x + 1) * FONT_WIDTH;

    if (s->update_y1 < (y + 1) * FONT_HEIGHT)

        s->update_y1 = (y + 1) * FONT_HEIGHT;

}

static void update_xy(QemuConsole *s, int x, int y)

{

    TextCell *c;

    int y1, y2;

    if (s != active_console) {

        return;

    }

    if (s->ds->have_text) {

        text_update_xy(s, x, y);

    }

    if (s->ds->have_gfx) {

        y1 = (s->y_base + y) % s->total_height;

        y2 = y1 - s->y_displayed;

        if (y2 < 0)

            y2 += s->total_height;

        if (y2 < s->height) {

            c = &s->cells[y1 * s->width + x];

            vga_putcharxy(s, x, y2, c->ch,

                          &(c->t_attrib));

            invalidate_xy(s, x, y2);

        }

    }

}

static void console_show_cursor(QemuConsole *s, int show)

{

    TextCell *c;

    int y, y1;

    int x = s->x;

    if (s != active_console) {

        return;

    }

    if (s->ds->have_text) {

        s->cursor_invalidate = 1;

    }

    if (s->ds->have_gfx) {

        if (x >= s->width) {

            x = s->width - 1;

        }

        y1 = (s->y_base + s->y) % s->total_height;

        y = y1 - s->y_displayed;

        if (y < 0)

            y += s->total_height;

        if (y < s->height) {

            c = &s->cells[y1 * s->width + x];

            if (show && s->cursor_visible_phase) {

                TextAttributes t_attrib = s->t_attrib_default;

                t_attrib.invers = !(t_attrib.invers); /* invert fg and bg */

                vga_putcharxy(s, x, y, c->ch, &t_attrib);

            } else {

                vga_putcharxy(s, x, y, c->ch, &(c->t_attrib));

            }

            invalidate_xy(s, x, y);

        }

    }

}

static void console_refresh(QemuConsole *s)

{

    DisplaySurface *surface = qemu_console_surface(s);

    TextCell *c;

    int x, y, y1;

    if (s != active_console)

        return;

    if (s->ds->have_text) {

        s->text_x[0] = 0;

        s->text_y[0] = 0;

        s->text_x[1] = s->width - 1;

        s->text_y[1] = s->height - 1;

        s->cursor_invalidate = 1;

    }

    if (s->ds->have_gfx) {

        vga_fill_rect(s, 0, 0, surface_width(surface), surface_height(surface),

                      color_table_rgb[0][COLOR_BLACK]);

        y1 = s->y_displayed;

        for (y = 0; y < s->height; y++) {

            c = s->cells + y1 * s->width;

            for (x = 0; x < s->width; x++) {

                vga_putcharxy(s, x, y, c->ch,

                              &(c->t_attrib));

                c++;

            }

            if (++y1 == s->total_height) {

                y1 = 0;

            }

        }

        console_show_cursor(s, 1);

        dpy_gfx_update(s, 0, 0,

                       surface_width(surface), surface_height(surface));

    }

}

static void console_scroll(int ydelta)

{

    QemuConsole *s;

    int i, y1;

    s = active_console;

    if (!s || (s->console_type == GRAPHIC_CONSOLE))

        return;

    if (ydelta > 0) {

        for(i = 0; i < ydelta; i++) {

            if (s->y_displayed == s->y_base)

                break;

            if (++s->y_displayed == s->total_height)

                s->y_displayed = 0;

        }

    } else {

        ydelta = -ydelta;

        i = s->backscroll_height;

        if (i > s->total_height - s->height)

            i = s->total_height - s->height;

        y1 = s->y_base - i;

        if (y1 < 0)

            y1 += s->total_height;

        for(i = 0; i < ydelta; i++) {

            if (s->y_displayed == y1)

                break;

            if (--s->y_displayed < 0)

                s->y_displayed = s->total_height - 1;

        }

    }

    console_refresh(s);

}

static void console_put_lf(QemuConsole *s)

{

    TextCell *c;

    int x, y1;

    s->y++;

    if (s->y >= s->height) {

        s->y = s->height - 1;

        if (s->y_displayed == s->y_base) {

            if (++s->y_displayed == s->total_height)

                s->y_displayed = 0;

        }

        if (++s->y_base == s->total_height)

            s->y_base = 0;

        if (s->backscroll_height < s->total_height)

            s->backscroll_height++;

        y1 = (s->y_base + s->height - 1) % s->total_height;

        c = &s->cells[y1 * s->width];

        for(x = 0; x < s->width; x++) {

            c->ch = ' ';

            c->t_attrib = s->t_attrib_default;

            c++;

        }

        if (s == active_console && s->y_displayed == s->y_base) {

            if (s->ds->have_text) {

                s->text_x[0] = 0;

                s->text_y[0] = 0;

                s->text_x[1] = s->width - 1;

                s->text_y[1] = s->height - 1;

            }

            if (s->ds->have_gfx) {

                vga_bitblt(s, 0, FONT_HEIGHT, 0, 0,

                           s->width * FONT_WIDTH,

                           (s->height - 1) * FONT_HEIGHT);

                vga_fill_rect(s, 0, (s->height - 1) * FONT_HEIGHT,

                              s->width * FONT_WIDTH, FONT_HEIGHT,

                              color_table_rgb[0][s->t_attrib_default.bgcol]);

                s->update_x0 = 0;

                s->update_y0 = 0;

                s->update_x1 = s->width * FONT_WIDTH;

                s->update_y1 = s->height * FONT_HEIGHT;

            }

        }

    }

}

/* Set console attributes depending on the current escape codes.

 * NOTE: I know this code is not very efficient (checking every color for it

 * self) but it is more readable and better maintainable.

 */

static void console_handle_escape(QemuConsole *s)

{

    int i;

    for (i=0; i<s->nb_esc_params; i++) {

        switch (s->esc_params[i]) {

            case 0: /* reset all console attributes to default */

                s->t_attrib = s->t_attrib_default;

                break;

            case 1:

                s->t_attrib.bold = 1;

                break;

            case 4:

                s->t_attrib.uline = 1;

                break;

            case 5:

                s->t_attrib.blink = 1;

                break;

            case 7:

                s->t_attrib.invers = 1;

                break;

            case 8:

                s->t_attrib.unvisible = 1;

                break;

            case 22:

                s->t_attrib.bold = 0;

                break;

            case 24:

                s->t_attrib.uline = 0;

                break;

            case 25:

                s->t_attrib.blink = 0;

                break;

            case 27:

                s->t_attrib.invers = 0;

                break;

            case 28:

                s->t_attrib.unvisible = 0;

                break;

            /* set foreground color */

            case 30:

                s->t_attrib.fgcol=COLOR_BLACK;

                break;

            case 31:

                s->t_attrib.fgcol=COLOR_RED;

                break;

            case 32:

                s->t_attrib.fgcol=COLOR_GREEN;

                break;

            case 33:

                s->t_attrib.fgcol=COLOR_YELLOW;

                break;

            case 34:

                s->t_attrib.fgcol=COLOR_BLUE;

                break;

            case 35:

                s->t_attrib.fgcol=COLOR_MAGENTA;

                break;

            case 36:

                s->t_attrib.fgcol=COLOR_CYAN;

                break;

            case 37:

                s->t_attrib.fgcol=COLOR_WHITE;

                break;

            /* set background color */

            case 40:

                s->t_attrib.bgcol=COLOR_BLACK;

                break;

            case 41:

                s->t_attrib.bgcol=COLOR_RED;

                break;

            case 42:

                s->t_attrib.bgcol=COLOR_GREEN;

                break;

            case 43:

                s->t_attrib.bgcol=COLOR_YELLOW;

                break;

            case 44:

                s->t_attrib.bgcol=COLOR_BLUE;

                break;

            case 45:

                s->t_attrib.bgcol=COLOR_MAGENTA;

                break;

            case 46:

                s->t_attrib.bgcol=COLOR_CYAN;

                break;

            case 47:

                s->t_attrib.bgcol=COLOR_WHITE;

                break;

        }

    }

}

static void console_clear_xy(QemuConsole *s, int x, int y)

{

    int y1 = (s->y_base + y) % s->total_height;

    TextCell *c = &s->cells[y1 * s->width + x];

    c->ch = ' ';

    c->t_attrib = s->t_attrib_default;

    update_xy(s, x, y);

}

/* set cursor, checking bounds */

static void set_cursor(QemuConsole *s, int x, int y)

{

    if (x < 0) {

        x = 0;

    }

    if (y < 0) {

        y = 0;

    }

    if (y >= s->height) {

        y = s->height - 1;

    }

    if (x >= s->width) {

        x = s->width - 1;

    }

    s->x = x;

    s->y = y;

}

static void console_putchar(QemuConsole *s, int ch)

{

    TextCell *c;

    int y1, i;

    int x, y;

    switch(s->state) {

    case TTY_STATE_NORM:

        switch(ch) {

        case '\r':  /* carriage return */

            s->x = 0;

            break;

        case '\n':  /* newline */

            console_put_lf(s);

            break;

        case '\b':  /* backspace */

            if (s->x > 0)

                s->x--;

            break;

        case '\t':  /* tabspace */

            if (s->x + (8 - (s->x % 8)) > s->width) {

                s->x = 0;

                console_put_lf(s);

            } else {

                s->x = s->x + (8 - (s->x % 8));

            }

            break;

        case '\a':  /* alert aka. bell */

            /* TODO: has to be implemented */

            break;

        case 14:

            /* SI (shift in), character set 0 (ignored) */

            break;

        case 15:

            /* SO (shift out), character set 1 (ignored) */

            break;

        case 27:    /* esc (introducing an escape sequence) */

            s->state = TTY_STATE_ESC;

            break;

        default:

            if (s->x >= s->width) {

                /* line wrap */

                s->x = 0;

                console_put_lf(s);

            }

            y1 = (s->y_base + s->y) % s->total_height;

            c = &s->cells[y1 * s->width + s->x];

            c->ch = ch;

            c->t_attrib = s->t_attrib;

            update_xy(s, s->x, s->y);

            s->x++;

            break;

        }

        break;