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/* Cursor motion calculation definitions for GNU Emacs
Copyright (C) 1985, 1989, 2001-2023 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 <https://www.gnu.org/licenses/>. */
#ifndef EMACS_CM_H
#define EMACS_CM_H
/* Holds the minimum and maximum costs for the parameterized 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 */
const char *cm_up; /* up (up) */
const char *cm_down; /* down (do) */
const char *cm_left; /* left (le) */
const char *cm_right; /* right (nd) */
const char *cm_home; /* home (ho) */
const char *cm_cr; /* carriage return (cr) */
const char *cm_ll; /* last line (ll) */
const char *cm_tab; /* tab (ta) */
const char *cm_backtab; /* backtab (bt) */
char *cm_abs; /* absolute (cm) */
const char *cm_habs; /* horizontal absolute (ch) */
const char *cm_vabs; /* vertical absolute (cv) */
#if false
const char *cm_ds; /* "don't send" string (ds) */
#endif
const char *cm_multiup; /* multiple up (UP) */
const char *cm_multidown; /* multiple down (DO) */
const char *cm_multileft; /* multiple left (LE) */
const 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) */
bool_bf cm_autowrap : 1; /* autowrap flag (am) */
bool_bf cm_magicwrap : 1; /* VT-100: cursor stays in last col but
will cm_wrap if next char is
printing (xn) */
bool_bf cm_usetabs : 1; /* if set, use tabs */
bool_bf cm_losewrap : 1; /* if reach right margin, forget cursor
location */
bool_bf cm_autolf : 1; /* \r performs a \r\n (rn) */
/* Parameterized capabilities. This needs to be a struct since
the costs are accessed through pointers. */
#if false
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-parameterized 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;
};
/* 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 /* NoCMShortHand */
#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 (int c);
#define emacs_tputs(tty, str, affcnt, putc) (current_tty = (tty), tputs (str, affcnt, putc))
extern struct tty_display_info *current_tty;
extern void cmcheckmagic (struct tty_display_info *);
extern int cmputc (int);
extern void cmcostinit (struct tty_display_info *);
extern void cmgoto (struct tty_display_info *, int, int);
extern void Wcm_clear (struct tty_display_info *);
extern int Wcm_init (struct tty_display_info *);
#endif /* EMACS_CM_H */
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