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/* Cursor motion calculation definitions for GNU Emacs
Copyright (C) 1985, 1989 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 2, 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; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */

/* 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 struct cm Wcm; /* Terminal capabilities */
extern char PC; /* Pad character */
#ifdef HAVE_TERMIOS_H
#include <termios.h>
/* HJL's version of libc is said to need this on the Alpha. */
speed_t ospeed;
#else
extern short ospeed; /* Output speed (from sg_ospeed) */
#endif

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

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

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

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

extern int cost;
extern int evalcost ();

extern void cmcheckmagic ();
extern int cmputc ();
extern int cmcostinit ();
extern int cmgoto ();
extern int Wcm_clear ();
extern int Wcm_init ();
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