/* Cursor motion calculation definitions for GNU Emacs
   Copyright (C) 1985, 1989, 2001, 2002, 2003, 2004,
                 2005, 2006, 2007, 2008, 2009, 2010  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

/* Holds the minimum and maximum costs for the parametrized capabilities.  */
struct parmcap
  {
    int mincost, maxcost;
  };

/* This structure holds everything needed to do cursor motion except the pad
   character (PC) and the output speed of the terminal (ospeed), which
   termcap wants in global variables.  */

struct cm
  {
    /* Cursor position.  -1 in *both* variables means the cursor
       position is unknown, in order to force absolute cursor motion. */

    int cm_curY;			/* Current row */
    int cm_curX;			/* Current column */

    /* Capabilities from termcap */
    char *cm_up;		/* up (up) */
    char *cm_down;		/* down (do) */
    char *cm_left;		/* left (le) */
    char *cm_right;		/* right (nd) */
    char *cm_home;		/* home (ho) */
    char *cm_cr;		/* carriage return (cr) */
    char *cm_ll;		/* last line (ll) */
    char *cm_tab;		/* tab (ta) */
    char *cm_backtab;		/* backtab (bt) */
    char *cm_abs;		/* absolute (cm) */
    char *cm_habs;		/* horizontal absolute (ch) */
    char *cm_vabs;		/* vertical absolute (cv) */
#if 0
    char *cm_ds;		/* "don't send" string (ds) */
#endif
    char *cm_multiup;		/* multiple up (UP) */
    char *cm_multidown;		/* multiple down (DO) */
    char *cm_multileft;		/* multiple left (LE) */
    char *cm_multiright;	/* multiple right (RI) */
    int cm_cols;		/* number of cols on screen (co) */
    int cm_rows;		/* number of rows on screen (li) */
    int cm_tabwidth;		/* tab width (it) */
    unsigned int cm_autowrap:1;	/* autowrap flag (am) */
    unsigned int cm_magicwrap:1; /* VT-100: cursor stays in last col but
				    will cm_wrap if next char is
				    printing (xn) */
    unsigned int cm_usetabs:1;	/* if set, use tabs */
    unsigned int cm_losewrap:1;	/* if reach right margin, forget cursor
				   location */
    unsigned int cm_autolf:1;	/* \r performs a \r\n (rn) */

    /* Parametrized capabilities.  This needs to be a struct since
       the costs are accessed through pointers.  */

#if 0
    struct parmcap cc_abs;	/* absolute (cm) */
    struct parmcap cc_habs;	/* horizontal absolute (ch) */
    struct parmcap cc_vabs;	/* vertical absolute (cv) */
    struct parmcap cc_multiup;	/* multiple up (UP) */
    struct parmcap cc_multidown; /* multiple down (DO) */
    struct parmcap cc_multileft; /* multiple left (LE) */
    struct parmcap cc_multiright; /* multiple right (RI) */
#endif

    /* Costs for the non-parametrized capabilities */
    int cc_up;			/* cost for up */
    int cc_down;		/* etc. */
    int cc_left;
    int cc_right;
    int cc_home;
    int cc_cr;
    int cc_ll;
    int cc_tab;
    int cc_backtab;
    /* These are temporary, until the code is installed to use the
       struct parmcap fields above.  */
    int cc_abs;
    int cc_habs;
    int cc_vabs;
  };

extern char PC;			/* Pad character */

/* Shorthand */
#ifndef NoCMShortHand
#define curY(tty)		(tty)->Wcm->cm_curY
#define curX(tty)		(tty)->Wcm->cm_curX
#define Up(tty)			(tty)->Wcm->cm_up
#define Down(tty)		(tty)->Wcm->cm_down
#define Left(tty)		(tty)->Wcm->cm_left
#define Right(tty)		(tty)->Wcm->cm_right
#define Tab(tty)		(tty)->Wcm->cm_tab
#define BackTab(tty)		(tty)->Wcm->cm_backtab
#define TabWidth(tty)		(tty)->Wcm->cm_tabwidth
#define CR(tty)			(tty)->Wcm->cm_cr
#define Home(tty)		(tty)->Wcm->cm_home
#define LastLine(tty)		(tty)->Wcm->cm_ll
#define AbsPosition(tty)	(tty)->Wcm->cm_abs
#define ColPosition(tty)	(tty)->Wcm->cm_habs
#define RowPosition(tty)	(tty)->Wcm->cm_vabs
#define MultiUp(tty)		(tty)->Wcm->cm_multiup
#define MultiDown(tty)		(tty)->Wcm->cm_multidown
#define MultiLeft(tty)		(tty)->Wcm->cm_multileft
#define MultiRight(tty)		(tty)->Wcm->cm_multiright
#define AutoWrap(tty)		(tty)->Wcm->cm_autowrap
#define MagicWrap(tty)		(tty)->Wcm->cm_magicwrap
#define UseTabs(tty)		(tty)->Wcm->cm_usetabs
#define FrameRows(tty)		(tty)->Wcm->cm_rows
#define FrameCols(tty)		(tty)->Wcm->cm_cols

#define UpCost(tty)		(tty)->Wcm->cc_up
#define DownCost(tty)		(tty)->Wcm->cc_down
#define LeftCost(tty)		(tty)->Wcm->cc_left
#define RightCost(tty)		(tty)->Wcm->cc_right
#define HomeCost(tty)		(tty)->Wcm->cc_home
#define CRCost(tty)		(tty)->Wcm->cc_cr
#define LastLineCost(tty)	(tty)->Wcm->cc_ll
#define TabCost(tty)		(tty)->Wcm->cc_tab
#define BackTabCost(tty)	(tty)->Wcm->cc_backtab
#define AbsPositionCost(tty)	(tty)->Wcm->cc_abs
#define ColPositionCost(tty)	(tty)->Wcm->cc_habs
#define RowPositionCost(tty)	(tty)->Wcm->cc_vabs
#define MultiUpCost(tty)	(tty)->Wcm->cc_multiup
#define MultiDownCost(tty)	(tty)->Wcm->cc_multidown
#define MultiLeftCost(tty)	(tty)->Wcm->cc_multileft
#define MultiRightCost(tty)	(tty)->Wcm->cc_multiright
#endif

#define cmat(tty,row,col)	(curY(tty) = (row), curX(tty) = (col))
#define cmplus(tty,n)					            \
  {                                                                 \
    if ((curX (tty) += (n)) >= FrameCols (tty) && !MagicWrap (tty)) \
      {                                                             \
	if ((tty)->Wcm->cm_losewrap) losecursor (tty);              \
	else if (AutoWrap (tty)) curX (tty) = 0, curY (tty)++;      \
	else curX (tty)--;                                          \
      }                                                             \
  }

#define losecursor(tty)	 (curX(tty) = -1, curY(tty) = -1)

extern int cost;
extern int evalcost ();

#define emacs_tputs(tty, str, affcnt, putc) (current_tty = (tty), tputs (str, affcnt, putc))

extern struct tty_display_info *current_tty;
extern void cmcheckmagic P_ ((struct tty_display_info *));
extern int cmputc P_ ((int));
extern void cmcostinit P_ ((struct tty_display_info *));
extern void cmgoto P_ ((struct tty_display_info *, int, int));
extern void Wcm_clear P_ ((struct tty_display_info *));
extern int Wcm_init P_ ((struct tty_display_info *));

/* arch-tag: acc1535a-7136-49d6-b22d-9bc85702251b
   (do not change this comment) */
