/* $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;
       }
}

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