/* $NetBSD: wsemul_dumb.c,v 1.18 2018/09/03 16:29:34 riastradh Exp $ */

/*
 * Copyright (c) 1996, 1997 Christopher G. Demetriou.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *      for the NetBSD Project.
 * 4. 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: wsemul_dumb.c,v 1.18 2018/09/03 16:29:34 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wsemulvar.h>
#include <dev/wscons/ascii.h>
#include <dev/wscons/wsksymdef.h>

void    *wsemul_dumb_cnattach(const struct wsscreen_descr *, void *,
                                   int, int, long);
void    *wsemul_dumb_attach(int console, const struct wsscreen_descr *,
                                 void *, int, int, void *, long);
void    wsemul_dumb_output(void *cookie, const u_char *data, u_int count, int);
int     wsemul_dumb_translate(void *cookie, keysym_t, const char **);
void    wsemul_dumb_detach(void *cookie, u_int *crowp, u_int *ccolp);
void    wsemul_dumb_resetop(void *, enum wsemul_resetops);

const struct wsemul_ops wsemul_dumb_ops = {
        .name = "dumb",
        .cnattach = wsemul_dumb_cnattach,
        .attach = wsemul_dumb_attach,
        .output = wsemul_dumb_output,
        .translate = wsemul_dumb_translate,
        .detach = wsemul_dumb_detach,
        .reset = wsemul_dumb_resetop,
        .getmsgattrs = NULL,
        .setmsgattrs = NULL,
        .resize = NULL,
};

struct wsemul_dumb_emuldata {
        const struct wsdisplay_emulops *emulops;
        void *emulcookie;
        void *cbcookie;
        u_int nrows, ncols, crow, ccol;
        long defattr;
};

struct wsemul_dumb_emuldata wsemul_dumb_console_emuldata;

void *
wsemul_dumb_cnattach(const struct wsscreen_descr *type, void *cookie,
        int ccol, int crow, long defattr)
{
        struct wsemul_dumb_emuldata *edp;

        edp = &wsemul_dumb_console_emuldata;

        edp->emulops = type->textops;
        edp->emulcookie = cookie;
        edp->nrows = type->nrows;
        edp->ncols = type->ncols;
        edp->crow = crow;
        edp->ccol = ccol;
        edp->defattr = defattr;
        edp->cbcookie = NULL;

        return (edp);
}

void *
wsemul_dumb_attach(int console, const struct wsscreen_descr *type,
        void *cookie, int ccol, int crow, void *cbcookie, long defattr)
{
        struct wsemul_dumb_emuldata *edp;

        if (console)
                edp = &wsemul_dumb_console_emuldata;
        else {
                edp = malloc(sizeof *edp, M_DEVBUF, M_WAITOK);

                edp->emulops = type->textops;
                edp->emulcookie = cookie;
                edp->nrows = type->nrows;
                edp->ncols = type->ncols;
                edp->crow = crow;
                edp->ccol = ccol;
                edp->defattr = defattr;
        }

        edp->cbcookie = cbcookie;

        return (edp);
}

void
wsemul_dumb_output(void *cookie, const u_char *data, u_int count,
    int kernel)
{
        struct wsemul_dumb_emuldata *edp = cookie;
        u_char c;
        int n;

        /* XXX */
        (*edp->emulops->cursor)(edp->emulcookie, 0, edp->crow, edp->ccol);
        while (count-- > 0) {
                c = *data++;
                switch (c) {
                case ASCII_BEL:
                        wsdisplay_emulbell(edp->cbcookie);
                        break;

                case ASCII_BS:
                        if (edp->ccol > 0)
                                edp->ccol--;
                        break;

                case ASCII_CR:
                        edp->ccol = 0;
                        break;

                case ASCII_HT:
                        n = uimin(8 - (edp->ccol & 7),
                            edp->ncols - edp->ccol - 1);
                        (*edp->emulops->erasecols)(edp->emulcookie,
                            edp->crow, edp->ccol, n, edp->defattr);
                        edp->ccol += n;
                        break;

                case ASCII_FF:
                        (*edp->emulops->eraserows)(edp->emulcookie, 0,
                            edp->nrows, edp->defattr);
                        edp->ccol = 0;
                        edp->crow = 0;
                        break;

                case ASCII_VT:
                        if (edp->crow > 0)
                                edp->crow--;
                        break;

                default:
                        (*edp->emulops->putchar)(edp->emulcookie, edp->crow,
                            edp->ccol, c, edp->defattr);
                        edp->ccol++;

                        /* if cur col is still on cur line, done. */
                        if (edp->ccol < edp->ncols)
                                break;

                        /* wrap the column around. */
                        edp->ccol = 0;

                        /* FALLTHRU */

                case ASCII_LF:
                        /* if the cur line isn't the last, incr and leave. */
                        if (edp->crow < edp->nrows - 1) {
                                edp->crow++;
                                break;
                        }
                        n = 1;          /* number of lines to scroll */
                        (*edp->emulops->copyrows)(edp->emulcookie, n, 0,
                            edp->nrows - n);
                        (*edp->emulops->eraserows)(edp->emulcookie,
                            edp->nrows - n, n, edp->defattr);
                        edp->crow -= n - 1;
                        break;
                }
        }
        /* XXX */
        (*edp->emulops->cursor)(edp->emulcookie, 1, edp->crow, edp->ccol);
}

int
wsemul_dumb_translate(void *cookie, keysym_t in,
    const char **out)
{
        static char c;

        if (KS_GROUP(in) == KS_GROUP_Plain) {
                /* allow ISO-1 */
                c = KS_VALUE(in);
                *out = &c;
                return (1);
        }
        return (0);
}

void
wsemul_dumb_detach(void *cookie, u_int *crowp, u_int *ccolp)
{
        struct wsemul_dumb_emuldata *edp = cookie;

        *crowp = edp->crow;
        *ccolp = edp->ccol;
        if (edp != &wsemul_dumb_console_emuldata)
                free(edp, M_DEVBUF);
}

void
wsemul_dumb_resetop(void *cookie, enum wsemul_resetops op)
{
        struct wsemul_dumb_emuldata *edp = cookie;

        switch (op) {
        case WSEMUL_CLEARSCREEN:
                (*edp->emulops->eraserows)(edp->emulcookie, 0, edp->nrows,
                                           edp->defattr);
                edp->ccol = edp->crow = 0;
                (*edp->emulops->cursor)(edp->emulcookie, 1, 0, 0);
                break;
        default:
                break;
        }
}