/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* Handle the event stream, converting console events into SDL events */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>

/* For parsing /proc */
#include <dirent.h>
#include <ctype.h>

#include <linux/vt.h>
#include <linux/kd.h>
#include <linux/keyboard.h>

#include "SDL_mutex.h"
#include "../SDL_sysvideo.h"
#include "../../events/SDL_sysevents.h"
#include "../../events/SDL_events_c.h"
#include "SDL_gsvideo.h"
#include "SDL_gsevents_c.h"
#include "SDL_gskeys.h"

#ifndef GPM_NODE_FIFO
#define GPM_NODE_FIFO	"/dev/gpmdata"
#endif

/* The translation tables from a console scancode to a SDL keysym */
#define NUM_VGAKEYMAPS	(1<<KG_CAPSSHIFT)
static Uint16 vga_keymap[NUM_VGAKEYMAPS][NR_KEYS];
static SDLKey keymap[128];
static Uint16 keymap_temp[128]; /* only used at startup */
static SDL_keysym *TranslateKey (int scancode, SDL_keysym * keysym);

/* Ugh, we have to duplicate the kernel's keysym mapping code...
   Oh, it's not so bad. :-)

   FIXME: Add keyboard LED handling code
 */
static void
GS_vgainitkeymaps (int fd)
{
    struct kbentry entry;
    int map, i;

    /* Don't do anything if we are passed a closed keyboard */
    if (fd < 0) {
        return;
    }

    /* Load all the keysym mappings */
    for (map = 0; map < NUM_VGAKEYMAPS; ++map) {
        SDL_memset (vga_keymap[map], 0, NR_KEYS * sizeof (Uint16));
        for (i = 0; i < NR_KEYS; ++i) {
            entry.kb_table = map;
            entry.kb_index = i;
            if (ioctl (fd, KDGKBENT, &entry) == 0) {
                /* fill keytemp. This replaces SDL_fbkeys.h */
                if ((map == 0) && (i < 128)) {
                    keymap_temp[i] = entry.kb_value;
                }
                /* The "Enter" key is a special case */
                if (entry.kb_value == K_ENTER) {
                    entry.kb_value = K (KT_ASCII, 13);
                }
                /* Handle numpad specially as well */
                if (KTYP (entry.kb_value) == KT_PAD) {
                    switch (entry.kb_value) {
                    case K_P0:
                    case K_P1:
                    case K_P2:
                    case K_P3:
                    case K_P4:
                    case K_P5:
                    case K_P6:
                    case K_P7:
                    case K_P8:
                    case K_P9:
                        vga_keymap[map][i] = entry.kb_value;
                        vga_keymap[map][i] += '0';
                        break;
                    case K_PPLUS:
                        vga_keymap[map][i] = K (KT_ASCII, '+');
                        break;
                    case K_PMINUS:
                        vga_keymap[map][i] = K (KT_ASCII, '-');
                        break;
                    case K_PSTAR:
                        vga_keymap[map][i] = K (KT_ASCII, '*');
                        break;
                    case K_PSLASH:
                        vga_keymap[map][i] = K (KT_ASCII, '/');
                        break;
                    case K_PENTER:
                        vga_keymap[map][i] = K (KT_ASCII, '\r');
                        break;
                    case K_PCOMMA:
                        vga_keymap[map][i] = K (KT_ASCII, ',');
                        break;
                    case K_PDOT:
                        vga_keymap[map][i] = K (KT_ASCII, '.');
                        break;
                    default:
                        break;
                    }
                }
                /* Do the normal key translation */
                if ((KTYP (entry.kb_value) == KT_LATIN) ||
                    (KTYP (entry.kb_value) == KT_ASCII) ||
                    (KTYP (entry.kb_value) == KT_LETTER)) {
                    vga_keymap[map][i] = entry.kb_value;
                }
            }
        }
    }
}

int
GS_InGraphicsMode (_THIS)
{
    return ((keyboard_fd >= 0) && (saved_kbd_mode >= 0));
}

int
GS_EnterGraphicsMode (_THIS)
{
    struct termios keyboard_termios;

    /* Set medium-raw keyboard mode */
    if ((keyboard_fd >= 0) && !GS_InGraphicsMode (this)) {

        /* Switch to the correct virtual terminal */
        if (current_vt > 0) {
            struct vt_stat vtstate;

            if (ioctl (keyboard_fd, VT_GETSTATE, &vtstate) == 0) {
                saved_vt = vtstate.v_active;
            }
            if (ioctl (keyboard_fd, VT_ACTIVATE, current_vt) == 0) {
                ioctl (keyboard_fd, VT_WAITACTIVE, current_vt);
            }
        }

        /* Set the terminal input mode */
        if (tcgetattr (keyboard_fd, &saved_kbd_termios) < 0) {
            SDL_SetError ("Unable to get terminal attributes");
            if (keyboard_fd > 0) {
                close (keyboard_fd);
            }
            keyboard_fd = -1;
            return (-1);
        }
        if (ioctl (keyboard_fd, KDGKBMODE, &saved_kbd_mode) < 0) {
            SDL_SetError ("Unable to get current keyboard mode");
            if (keyboard_fd > 0) {
                close (keyboard_fd);
            }
            keyboard_fd = -1;
            return (-1);
        }
        keyboard_termios = saved_kbd_termios;
        keyboard_termios.c_lflag &= ~(ICANON | ECHO | ISIG);
        keyboard_termios.c_iflag &=
            ~(ISTRIP | IGNCR | ICRNL | INLCR | IXOFF | IXON);
        keyboard_termios.c_cc[VMIN] = 0;
        keyboard_termios.c_cc[VTIME] = 0;
        if (tcsetattr (keyboard_fd, TCSAFLUSH, &keyboard_termios) < 0) {
            GS_CloseKeyboard (this);
            SDL_SetError ("Unable to set terminal attributes");
            return (-1);
        }
        /* This will fail if we aren't root or this isn't our tty */
        if (ioctl (keyboard_fd, KDSKBMODE, K_MEDIUMRAW) < 0) {
            GS_CloseKeyboard (this);
            SDL_SetError ("Unable to set keyboard in raw mode");
            return (-1);
        }
        if (ioctl (keyboard_fd, KDSETMODE, KD_GRAPHICS) < 0) {
            GS_CloseKeyboard (this);
            SDL_SetError ("Unable to set keyboard in graphics mode");
            return (-1);
        }
    }
    return (keyboard_fd);
}

void
GS_LeaveGraphicsMode (_THIS)
{
    if (GS_InGraphicsMode (this)) {
        ioctl (keyboard_fd, KDSETMODE, KD_TEXT);
        ioctl (keyboard_fd, KDSKBMODE, saved_kbd_mode);
        tcsetattr (keyboard_fd, TCSAFLUSH, &saved_kbd_termios);
        saved_kbd_mode = -1;

        /* Head back over to the original virtual terminal */
        if (saved_vt > 0) {
            ioctl (keyboard_fd, VT_ACTIVATE, saved_vt);
        }
    }
}

void
GS_CloseKeyboard (_THIS)
{
    if (keyboard_fd >= 0) {
        GS_LeaveGraphicsMode (this);
        if (keyboard_fd > 0) {
            close (keyboard_fd);
        }
    }
    keyboard_fd = -1;
}

int
GS_OpenKeyboard (_THIS)
{
    /* Open only if not already opened */
    if (keyboard_fd < 0) {
        char *tty0[] = { "/dev/tty0", "/dev/vc/0", NULL };
        char *vcs[] = { "/dev/vc/%d", "/dev/tty%d", NULL };
        int i, tty0_fd;

        /* Try to query for a free virtual terminal */
        tty0_fd = -1;
        for (i = 0; tty0[i] && (tty0_fd < 0); ++i) {
            tty0_fd = open (tty0[i], O_WRONLY, 0);
        }
        if (tty0_fd < 0) {
            tty0_fd = dup (0);  /* Maybe stdin is a VT? */
        }
        ioctl (tty0_fd, VT_OPENQRY, &current_vt);
        close (tty0_fd);
        if ((geteuid () == 0) && (current_vt > 0)) {
            for (i = 0; vcs[i] && (keyboard_fd < 0); ++i) {
                char vtpath[12];

                SDL_snprintf (vtpath, SDL_arraysize (vtpath), vcs[i],
                              current_vt);
                keyboard_fd = open (vtpath, O_RDWR, 0);
#ifdef DEBUG_KEYBOARD
                fprintf (stderr, "vtpath = %s, fd = %d\n",
                         vtpath, keyboard_fd);
#endif /* DEBUG_KEYBOARD */

                /* This needs to be our controlling tty
                   so that the kernel ioctl() calls work
                 */
                if (keyboard_fd >= 0) {
                    tty0_fd = open ("/dev/tty", O_RDWR, 0);
                    if (tty0_fd >= 0) {
                        ioctl (tty0_fd, TIOCNOTTY, 0);
                        close (tty0_fd);
                    }
                }
            }
        }
        if (keyboard_fd < 0) {
            /* Last resort, maybe our tty is a usable VT */
            current_vt = 0;
            keyboard_fd = open ("/dev/tty", O_RDWR);
        }
#ifdef DEBUG_KEYBOARD
        fprintf (stderr, "Current VT: %d\n", current_vt);
#endif
        saved_kbd_mode = -1;

        /* Make sure that our input is a console terminal */
        {
            int dummy;
            if (ioctl (keyboard_fd, KDGKBMODE, &dummy) < 0) {
                close (keyboard_fd);
                keyboard_fd = -1;
                SDL_SetError ("Unable to open a console terminal");
            }
        }

        /* Set up keymap */
        GS_vgainitkeymaps (keyboard_fd);
    }
    return (keyboard_fd);
}

static enum
{
    MOUSE_NONE = -1,
    MOUSE_GPM,                  /* Note: GPM uses the MSC protocol */
    MOUSE_PS2,
    MOUSE_IMPS2,
    MOUSE_MS,
    MOUSE_BM,
    NUM_MOUSE_DRVS
} mouse_drv = MOUSE_NONE;

void
GS_CloseMouse (_THIS)
{
    if (mouse_fd > 0) {
        close (mouse_fd);
    }
    mouse_fd = -1;
}

/* Returns processes listed in /proc with the desired name */
static int
find_pid (DIR * proc, const char *wanted_name)
{
    struct dirent *entry;
    int pid;

    /* First scan proc for the gpm process */
    pid = 0;
    while ((pid == 0) && ((entry = readdir (proc)) != NULL)) {
        if (isdigit (entry->d_name[0])) {
            FILE *status;
            char path[PATH_MAX];
            char name[PATH_MAX];

            SDL_snprintf (path, SDL_arraysize (path), "/proc/%s/status",
                          entry->d_name);
            status = fopen (path, "r");
            if (status) {
                name[0] = '\0';
                fscanf (status, "Name: %s", name);
                if (SDL_strcmp (name, wanted_name) == 0) {
                    pid = atoi (entry->d_name);
                }
                fclose (status);
            }
        }
    }
    return pid;
}

/* Returns true if /dev/gpmdata is being written to by gpm */
static int
gpm_available (void)
{
    int available;
    DIR *proc;
    int pid;
    int cmdline, len, arglen;
    char path[PATH_MAX];
    char args[PATH_MAX], *arg;

    /* Don't bother looking if the fifo isn't there */
    if (access (GPM_NODE_FIFO, F_OK) < 0) {
        return (0);
    }

    available = 0;
    proc = opendir ("/proc");
    if (proc) {
        while ((pid = find_pid (proc, "gpm")) > 0) {
            SDL_snprintf (path, SDL_arraysize (path), "/proc/%d/cmdline",
                          pid);
            cmdline = open (path, O_RDONLY, 0);
            if (cmdline >= 0) {
                len = read (cmdline, args, sizeof (args));
                arg = args;
                while (len > 0) {
                    if (SDL_strcmp (arg, "-R") == 0) {
                        available = 1;
                    }
                    arglen = SDL_strlen (arg) + 1;
                    len -= arglen;
                    arg += arglen;
                }
                close (cmdline);
            }
        }
        closedir (proc);
    }
    return available;
}


/* rcg06112001 Set up IMPS/2 mode, if possible. This gives
 *  us access to the mousewheel, etc. Returns zero if
 *  writes to device failed, but you still need to query the
 *  device to see which mode it's actually in.
 */
static int
set_imps2_mode (int fd)
{
    /* If you wanted to control the mouse mode (and we do :)  ) ...
       Set IMPS/2 protocol:
       {0xf3,200,0xf3,100,0xf3,80}
       Reset mouse device:
       {0xFF}
     */
    Uint8 set_imps2[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
    Uint8 reset = 0xff;
    fd_set fdset;
    struct timeval tv;
    int retval = 0;

    if (write (fd, &set_imps2, sizeof (set_imps2)) == sizeof (set_imps2)) {
        if (write (fd, &reset, sizeof (reset)) == sizeof (reset)) {
            retval = 1;
        }
    }

    /* Get rid of any chatter from the above */
    FD_ZERO (&fdset);
    FD_SET (fd, &fdset);
    tv.tv_sec = 0;
    tv.tv_usec = 0;
    while (select (fd + 1, &fdset, 0, 0, &tv) > 0) {
        char temp[32];
        read (fd, temp, sizeof (temp));
    }

    return retval;
}


/* Returns true if the mouse uses the IMPS/2 protocol */
static int
detect_imps2 (int fd)
{
    int imps2;

    imps2 = 0;

    if (SDL_getenv ("SDL_MOUSEDEV_IMPS2")) {
        imps2 = 1;
    }
    if (!imps2) {
        Uint8 query_ps2 = 0xF2;
        fd_set fdset;
        struct timeval tv;

        /* Get rid of any mouse motion noise */
        FD_ZERO (&fdset);
        FD_SET (fd, &fdset);
        tv.tv_sec = 0;
        tv.tv_usec = 0;
        while (select (fd + 1, &fdset, 0, 0, &tv) > 0) {
            char temp[32];
            read (fd, temp, sizeof (temp));
        }

        /* Query for the type of mouse protocol */
        if (write (fd, &query_ps2, sizeof (query_ps2)) == sizeof (query_ps2)) {
            Uint8 ch = 0;

            /* Get the mouse protocol response */
            do {
                FD_ZERO (&fdset);
                FD_SET (fd, &fdset);
                tv.tv_sec = 1;
                tv.tv_usec = 0;
                if (select (fd + 1, &fdset, 0, 0, &tv) < 1) {
                    break;
                }
            }
            while ((read (fd, &ch, sizeof (ch)) == sizeof (ch)) &&
                   ((ch == 0xFA) || (ch == 0xAA)));

            /* Experimental values (Logitech wheelmouse) */
#ifdef DEBUG_MOUSE
            fprintf (stderr, "Last mouse mode: 0x%x\n", ch);
#endif
            if (ch == 3) {
                imps2 = 1;
            }
        }
    }
    return imps2;
}

int
GS_OpenMouse (_THIS)
{
    int i;
    const char *mousedev;
    const char *mousedrv;

    mousedrv = SDL_getenv ("SDL_MOUSEDRV");
    mousedev = SDL_getenv ("SDL_MOUSEDEV");
    mouse_fd = -1;

    /* STD MICE */

    if (mousedev == NULL) {
        /* FIXME someday... allow multiple mice in this driver */
        char *ps2mice[] = {
            "/dev/input/mice", "/dev/usbmouse", "/dev/psaux", NULL
        };
        /* First try to use GPM in repeater mode */
        if (mouse_fd < 0) {
            if (gpm_available ()) {
                mouse_fd = open (GPM_NODE_FIFO, O_RDONLY, 0);
                if (mouse_fd >= 0) {
#ifdef DEBUG_MOUSE
                    fprintf (stderr, "Using GPM mouse\n");
#endif
                    mouse_drv = MOUSE_GPM;
                }
            }
        }
        /* Now try to use a modern PS/2 mouse */
        for (i = 0; (mouse_fd < 0) && ps2mice[i]; ++i) {
            mouse_fd = open (ps2mice[i], O_RDWR, 0);
            if (mouse_fd < 0) {
                mouse_fd = open (ps2mice[i], O_RDONLY, 0);
            }
            if (mouse_fd >= 0) {
                /* rcg06112001 Attempt to set IMPS/2 mode */
                if (i == 0) {
                    set_imps2_mode (mouse_fd);
                }
                if (detect_imps2 (mouse_fd)) {
#ifdef DEBUG_MOUSE
                    fprintf (stderr, "Using IMPS2 mouse\n");
#endif
                    mouse_drv = MOUSE_IMPS2;
                } else {
                    mouse_drv = MOUSE_PS2;
#ifdef DEBUG_MOUSE
                    fprintf (stderr, "Using PS2 mouse\n");
#endif
                }
            }
        }
        /* Next try to use a PPC ADB port mouse */
        if (mouse_fd < 0) {
            mouse_fd = open ("/dev/adbmouse", O_RDONLY, 0);
            if (mouse_fd >= 0) {
#ifdef DEBUG_MOUSE
                fprintf (stderr, "Using ADB mouse\n");
#endif
                mouse_drv = MOUSE_BM;
            }
        }
    }
    /* Default to a serial Microsoft mouse */
    if (mouse_fd < 0) {
        if (mousedev == NULL) {
            mousedev = "/dev/mouse";
        }
        mouse_fd = open (mousedev, O_RDONLY, 0);
        if (mouse_fd >= 0) {
            struct termios mouse_termios;

            /* Set the sampling speed to 1200 baud */
            tcgetattr (mouse_fd, &mouse_termios);
            mouse_termios.c_iflag = IGNBRK | IGNPAR;
            mouse_termios.c_oflag = 0;
            mouse_termios.c_lflag = 0;
            mouse_termios.c_line = 0;
            mouse_termios.c_cc[VTIME] = 0;
            mouse_termios.c_cc[VMIN] = 1;
            mouse_termios.c_cflag = CREAD | CLOCAL | HUPCL;
            mouse_termios.c_cflag |= CS8;
            mouse_termios.c_cflag |= B1200;
            tcsetattr (mouse_fd, TCSAFLUSH, &mouse_termios);
#ifdef DEBUG_MOUSE
            fprintf (stderr, "Using Microsoft mouse on %s\n", mousedev);
#endif
            mouse_drv = MOUSE_MS;
        }
    }
    if (mouse_fd < 0) {
        mouse_drv = MOUSE_NONE;
    }
    return (mouse_fd);
}

static int posted = 0;

void
GS_vgamousecallback (int button, int dx, int dy)
{
    int button_1, button_3;
    int button_state;
    int state_changed;
    int i;
    Uint8 state;

    if (dx || dy) {
        posted += SDL_PrivateMouseMotion (0, 1, dx, dy);
    }

    /* Swap button 1 and 3 */
    button_1 = (button & 0x04) >> 2;
    button_3 = (button & 0x01) << 2;
    button &= ~0x05;
    button |= (button_1 | button_3);

    /* See what changed */
    button_state = SDL_GetMouseState (NULL, NULL);
    state_changed = button_state ^ button;
    for (i = 0; i < 8; ++i) {
        if (state_changed & (1 << i)) {
            if (button & (1 << i)) {
                state = SDL_PRESSED;
            } else {
                state = SDL_RELEASED;
            }
            posted += SDL_PrivateMouseButton (state, i + 1, 0, 0);
        }
    }
}

/* For now, use GPM, PS/2, and MS protocols
   Driver adapted from the SVGAlib mouse driver code (taken from gpm, etc.)
 */
static void
handle_mouse (_THIS)
{
    static int start = 0;
    static unsigned char mousebuf[BUFSIZ];
    int i, nread;
    int button = 0;
    int dx = 0, dy = 0;
    int packetsize = 0;

    /* Figure out the mouse packet size */
    switch (mouse_drv) {
    case MOUSE_NONE:
        /* Ack! */
        read (mouse_fd, mousebuf, BUFSIZ);
        return;
    case MOUSE_GPM:
        packetsize = 5;
        break;
    case MOUSE_IMPS2:
        packetsize = 4;
        break;
    case MOUSE_PS2:
    case MOUSE_MS:
    case MOUSE_BM:
        packetsize = 3;
        break;
    case NUM_MOUSE_DRVS:
        /* Uh oh.. */
        packetsize = 0;
        break;
    }

    /* Read as many packets as possible */
    nread = read (mouse_fd, &mousebuf[start], BUFSIZ - start);
    if (nread < 0) {
        return;
    }
    nread += start;
#ifdef DEBUG_MOUSE
    fprintf (stderr, "Read %d bytes from mouse, start = %d\n", nread, start);
#endif
    for (i = 0; i < (nread - (packetsize - 1)); i += packetsize) {
        switch (mouse_drv) {
        case MOUSE_NONE:
            break;
        case MOUSE_GPM:
            /* GPM protocol has 0x80 in high byte */
            if ((mousebuf[i] & 0xF8) != 0x80) {
                /* Go to next byte */
                i -= (packetsize - 1);
                continue;
            }
            /* Get current mouse state */
            button = (~mousebuf[i]) & 0x07;
            dx = (signed char) (mousebuf[i + 1]) +
                (signed char) (mousebuf[i + 3]);
            dy = -((signed char) (mousebuf[i + 2]) +
                   (signed char) (mousebuf[i + 4]));
            break;
        case MOUSE_PS2:
            /* PS/2 protocol has nothing in high byte */
            if ((mousebuf[i] & 0xC0) != 0) {
                /* Go to next byte */
                i -= (packetsize - 1);
                continue;
            }
            /* Get current mouse state */
            button = (mousebuf[i] & 0x04) >> 1 |        /*Middle */
                (mousebuf[i] & 0x02) >> 1 |     /*Right */
                (mousebuf[i] & 0x01) << 2;      /*Left */
            dx = (mousebuf[i] & 0x10) ?
                mousebuf[i + 1] - 256 : mousebuf[i + 1];
            dy = (mousebuf[i] & 0x20) ?
                -(mousebuf[i + 2] - 256) : -mousebuf[i + 2];
            break;
        case MOUSE_IMPS2:
            /* Get current mouse state */
            button = (mousebuf[i] & 0x04) >> 1 |        /*Middle */
                (mousebuf[i] & 0x02) >> 1 |     /*Right */
                (mousebuf[i] & 0x01) << 2 |     /*Left */
                (mousebuf[i] & 0x40) >> 3 |     /* 4 */
                (mousebuf[i] & 0x80) >> 3;      /* 5 */
            dx = (mousebuf[i] & 0x10) ?
                mousebuf[i + 1] - 256 : mousebuf[i + 1];
            dy = (mousebuf[i] & 0x20) ?
                -(mousebuf[i + 2] - 256) : -mousebuf[i + 2];
            switch (mousebuf[i + 3] & 0x0F) {
            case 0x0E:         /* DX = +1 */
            case 0x02:         /* DX = -1 */
                break;
            case 0x0F:         /* DY = +1 (map button 4) */
                FB_vgamousecallback (button | (1 << 3), 1, 0, 0);
                break;
            case 0x01:         /* DY = -1 (map button 5) */
                FB_vgamousecallback (button | (1 << 4), 1, 0, 0);
                break;
            }
            break;
        case MOUSE_MS:
            /* Microsoft protocol has 0x40 in high byte */
            if ((mousebuf[i] & 0x40) != 0x40) {
                /* Go to next byte */
                i -= (packetsize - 1);
                continue;
            }
            /* Get current mouse state */
            button = ((mousebuf[i] & 0x20) >> 3) |
                ((mousebuf[i] & 0x10) >> 4);
            dx = (signed char) (((mousebuf[i] & 0x03) << 6) |
                                (mousebuf[i + 1] & 0x3F));
            dy = (signed char) (((mousebuf[i] & 0x0C) << 4) |
                                (mousebuf[i + 2] & 0x3F));
            break;
        case MOUSE_BM:
            /* BusMouse protocol has 0xF8 in high byte */
            if ((mousebuf[i] & 0xF8) != 0x80) {
                /* Go to next byte */
                i -= (packetsize - 1);
                continue;
            }
            /* Get current mouse state */
            button = (~mousebuf[i]) & 0x07;
            dx = (signed char) mousebuf[i + 1];
            dy = -(signed char) mousebuf[i + 2];
            break;
        case NUM_MOUSE_DRVS:
            /* Uh oh.. */
            dx = 0;
            dy = 0;
            break;
        }
        GS_vgamousecallback (button, dx, dy);
    }
    if (i < nread) {
        SDL_memcpy (mousebuf, &mousebuf[i], (nread - i));
        start = (nread - i);
    } else {
        start = 0;
    }
    return;
}

static void
handle_keyboard (_THIS)
{
    unsigned char keybuf[BUFSIZ];
    int i, nread;
    int pressed;
    int scancode;
    SDL_keysym keysym;

    nread = read (keyboard_fd, keybuf, BUFSIZ);
    for (i = 0; i < nread; ++i) {
        scancode = keybuf[i] & 0x7F;
        if (keybuf[i] & 0x80) {
            pressed = SDL_RELEASED;
        } else {
            pressed = SDL_PRESSED;
        }
        TranslateKey (scancode, &keysym);
        posted += SDL_PrivateKeyboard (pressed, &keysym);
    }
}

void
GS_PumpEvents (_THIS)
{
    fd_set fdset;
    int max_fd;
    static struct timeval zero;

    do {
        posted = 0;

        FD_ZERO (&fdset);
        max_fd = 0;
        if (keyboard_fd >= 0) {
            FD_SET (keyboard_fd, &fdset);
            if (max_fd < keyboard_fd) {
                max_fd = keyboard_fd;
            }
        }
        if (mouse_fd >= 0) {
            FD_SET (mouse_fd, &fdset);
            if (max_fd < mouse_fd) {
                max_fd = mouse_fd;
            }
        }
        if (select (max_fd + 1, &fdset, NULL, NULL, &zero) > 0) {
            if (keyboard_fd >= 0) {
                if (FD_ISSET (keyboard_fd, &fdset)) {
                    handle_keyboard (this);
                }
            }
            if (mouse_fd >= 0) {
                if (FD_ISSET (mouse_fd, &fdset)) {
                    handle_mouse (this);
                }
            }
        }
    }
    while (posted);
}

void
GS_InitOSKeymap (_THIS)
{
    int i;

    /* Initialize the Linux key translation table */

    /* First get the ascii keys and others not well handled */
    for (i = 0; i < SDL_arraysize (keymap); ++i) {
        switch (i) {
            /* These aren't handled by the x86 kernel keymapping (?) */
        case SCANCODE_PRINTSCREEN:
            keymap[i] = SDLK_PRINT;
            break;
        case SCANCODE_BREAK:
            keymap[i] = SDLK_BREAK;
            break;
        case SCANCODE_BREAK_ALTERNATIVE:
            keymap[i] = SDLK_PAUSE;
            break;
        case SCANCODE_LEFTSHIFT:
            keymap[i] = SDLK_LSHIFT;
            break;
        case SCANCODE_RIGHTSHIFT:
            keymap[i] = SDLK_RSHIFT;
            break;
        case SCANCODE_LEFTCONTROL:
            keymap[i] = SDLK_LCTRL;
            break;
        case SCANCODE_RIGHTCONTROL:
            keymap[i] = SDLK_RCTRL;
            break;
        case SCANCODE_RIGHTWIN:
            keymap[i] = SDLK_RSUPER;
            break;
        case SCANCODE_LEFTWIN:
            keymap[i] = SDLK_LSUPER;
            break;
        case 127:
            keymap[i] = SDLK_MENU;
            break;
            /* this should take care of all standard ascii keys */
        default:
            keymap[i] = KVAL (vga_keymap[0][i]);
            break;
        }
    }
    for (i = 0; i < SDL_arraysize (keymap); ++i) {
        switch (keymap_temp[i]) {
        case K_F1:
            keymap[i] = SDLK_F1;
            break;
        case K_F2:
            keymap[i] = SDLK_F2;
            break;
        case K_F3:
            keymap[i] = SDLK_F3;
            break;
        case K_F4:
            keymap[i] = SDLK_F4;
            break;
        case K_F5:
            keymap[i] = SDLK_F5;
            break;
        case K_F6:
            keymap[i] = SDLK_F6;
            break;
        case K_F7:
            keymap[i] = SDLK_F7;
            break;
        case K_F8:
            keymap[i] = SDLK_F8;
            break;
        case K_F9:
            keymap[i] = SDLK_F9;
            break;
        case K_F10:
            keymap[i] = SDLK_F10;
            break;
        case K_F11:
            keymap[i] = SDLK_F11;
            break;
        case K_F12:
            keymap[i] = SDLK_F12;
            break;

        case K_DOWN:
            keymap[i] = SDLK_DOWN;
            break;
        case K_LEFT:
            keymap[i] = SDLK_LEFT;
            break;
        case K_RIGHT:
            keymap[i] = SDLK_RIGHT;
            break;
        case K_UP:
            keymap[i] = SDLK_UP;
            break;

        case K_P0:
            keymap[i] = SDLK_KP0;
            break;
        case K_P1:
            keymap[i] = SDLK_KP1;
            break;
        case K_P2:
            keymap[i] = SDLK_KP2;
            break;
        case K_P3:
            keymap[i] = SDLK_KP3;
            break;
        case K_P4:
            keymap[i] = SDLK_KP4;
            break;
        case K_P5:
            keymap[i] = SDLK_KP5;
            break;
        case K_P6:
            keymap[i] = SDLK_KP6;
            break;
        case K_P7:
            keymap[i] = SDLK_KP7;
            break;
        case K_P8:
            keymap[i] = SDLK_KP8;
            break;
        case K_P9:
            keymap[i] = SDLK_KP9;
            break;
        case K_PPLUS:
            keymap[i] = SDLK_KP_PLUS;
            break;
        case K_PMINUS:
            keymap[i] = SDLK_KP_MINUS;
            break;
        case K_PSTAR:
            keymap[i] = SDLK_KP_MULTIPLY;
            break;
        case K_PSLASH:
            keymap[i] = SDLK_KP_DIVIDE;
            break;
        case K_PENTER:
            keymap[i] = SDLK_KP_ENTER;
            break;
        case K_PDOT:
            keymap[i] = SDLK_KP_PERIOD;
            break;

        case K_SHIFT:
            if (keymap[i] != SDLK_RSHIFT)
                keymap[i] = SDLK_LSHIFT;
            break;
        case K_SHIFTL:
            keymap[i] = SDLK_LSHIFT;
            break;
        case K_SHIFTR:
            keymap[i] = SDLK_RSHIFT;
            break;
        case K_CTRL:
            if (keymap[i] != SDLK_RCTRL)
                keymap[i] = SDLK_LCTRL;
            break;
        case K_CTRLL:
            keymap[i] = SDLK_LCTRL;
            break;
        case K_CTRLR:
            keymap[i] = SDLK_RCTRL;
            break;
        case K_ALT:
            keymap[i] = SDLK_LALT;
            break;
        case K_ALTGR:
            keymap[i] = SDLK_RALT;
            break;

        case K_INSERT:
            keymap[i] = SDLK_INSERT;
            break;
        case K_REMOVE:
            keymap[i] = SDLK_DELETE;
            break;
        case K_PGUP:
            keymap[i] = SDLK_PAGEUP;
            break;
        case K_PGDN:
            keymap[i] = SDLK_PAGEDOWN;
            break;
        case K_FIND:
            keymap[i] = SDLK_HOME;
            break;
        case K_SELECT:
            keymap[i] = SDLK_END;
            break;

        case K_NUM:
            keymap[i] = SDLK_NUMLOCK;
            break;
        case K_CAPS:
            keymap[i] = SDLK_CAPSLOCK;
            break;

        case K_F13:
            keymap[i] = SDLK_PRINT;
            break;
        case K_HOLD:
            keymap[i] = SDLK_SCROLLOCK;
            break;
        case K_PAUSE:
            keymap[i] = SDLK_PAUSE;
            break;

        case 127:
            keymap[i] = SDLK_BACKSPACE;
            break;

        default:
            break;
        }
    }
}

static SDL_keysym *
TranslateKey (int scancode, SDL_keysym * keysym)
{
    /* Set the keysym information */
    keysym->scancode = scancode;
    keysym->sym = keymap[scancode];
    keysym->mod = KMOD_NONE;

    /* If UNICODE is on, get the UNICODE value for the key */
    keysym->unicode = 0;
    if (SDL_TranslateUNICODE) {
        int map;
        SDLMod modstate;

        modstate = SDL_GetModState ();
        map = 0;
        if (modstate & KMOD_SHIFT) {
            map |= (1 << KG_SHIFT);
        }
        if (modstate & KMOD_CTRL) {
            map |= (1 << KG_CTRL);
        }
        if (modstate & KMOD_ALT) {
            map |= (1 << KG_ALT);
        }
        if (modstate & KMOD_MODE) {
            map |= (1 << KG_ALTGR);
        }
        if (KTYP (vga_keymap[map][scancode]) == KT_LETTER) {
            if (modstate & KMOD_CAPS) {
                map ^= (1 << KG_SHIFT);
            }
        }
        if (KTYP (vga_keymap[map][scancode]) == KT_PAD) {
            if (modstate & KMOD_NUM) {
                keysym->unicode = KVAL (vga_keymap[map][scancode]);
            }
        } else {
            keysym->unicode = KVAL (vga_keymap[map][scancode]);
        }
    }
    return (keysym);
}

/* vi: set ts=4 sw=4 expandtab: */