http://invisible-island.net/ncurses/ncurses.faq (contrast)
/* Copyright (c) 1981 Regents of the University of California */
/* sccs id: @(#)ex_vis.h 7.1 7/8/81 */
/*
* Ex version 3
* Mark Horton, UCB
* Bill Joy UCB
*
* Open and visual mode definitions.
*
* There are actually 4 major states in open/visual modes. These
* are visual, crt open (where the cursor can move about the screen and
* the screen can scroll and be erased), one line open (on dumb glass-crt's
* like the adm3), and hardcopy open (for everything else).
*
* The basic state is given by bastate, and the current state by state,
* since we can be in pseudo-hardcopy mode if we are on an adm3 and the
* line is longer than 80.
*/
var short bastate;
var short state;
#define VISUAL 0
#define CRTOPEN 1
#define ONEOPEN 2
#define HARDOPEN 3
/*
* The screen in visual and crtopen is of varying size; the basic
* window has top basWTOP and basWLINES lines are thereby implied.
* The current window (which may have grown from the basic size)
* has top WTOP and WLINES lines. The top line of the window is WTOP,
* and the bottom line WBOT. The line WECHO is used for messages,
* search strings and the like. If WBOT==WECHO then we are in ONEOPEN
* or HARDOPEN and there is no way back to the line we were on if we
* go to WECHO (i.e. we will have to scroll before we go there, and
* we can't get back). There are WCOLS columns per line.
* If WBOT!=WECHO then WECHO will be the last line on the screen
* and WBOT is the line before it.
*/
var short basWTOP;
var short basWLINES;
var short WTOP;
var short WBOT;
var short WLINES;
var short WCOLS;
var short WECHO;
/*
* When we are dealing with the echo area we consider the window
* to be "split" and set the variable splitw. Otherwise, moving
* off the bottom of the screen into WECHO causes a screen rollup.
*/
var bool splitw;
/*
* Information about each line currently on the screen includes
* the y coordinate associated with the line, the printing depth
* of the line (0 indicates unknown), and a mask which indicates
* whether the line is "unclean", i.e. whether we should check
* to make sure the line is displayed correctly at the next
* appropriate juncture.
*/
struct vlinfo {
short vliny; /* Y coordinate */ /* mjm: was char */
short vdepth; /* Depth of displayed line */ /*mjm: was char */
short vflags; /* Is line potentially dirty ? */
};
var struct vlinfo vlinfo[TUBELINES + 2];
#define DEPTH(c) (vlinfo[c].vdepth)
#define LINE(c) (vlinfo[c].vliny)
#define FLAGS(c) (vlinfo[c].vflags)
#define VDIRT 1
/*
* Hacks to copy vlinfo structures around
*/
#ifdef V6
/* Kludge to make up for no structure assignment */
struct {
long longi;
};
# define vlcopy(i, j) i.longi = j.longi
#else
# define vlcopy(i, j) i = j;
#endif
/*
* The current line on the screen is represented by vcline.
* There are vcnt lines on the screen, the last being "vcnt - 1".
* Vcline is intimately tied to the current value of dot,
* and when command mode is used as a subroutine fancy footwork occurs.
*/
var short vcline;
var short vcnt;
/*
* To allow many optimizations on output, an exact image of the terminal
* screen is maintained in the space addressed by vtube0. The vtube
* array indexes this space as lines, and is shuffled on scrolls, insert+delete
* lines and the like rather than (more expensively) shuffling the screen
* data itself. It is also rearranged during insert mode across line
* boundaries to make incore work easier.
*/
var char *vtube[TUBELINES];
var char *vtube0;
/*
* The current cursor position within the current line is kept in
* cursor. The current line is kept in linebuf. During insertions
* we use the auxiliary array genbuf as scratch area.
* The cursor wcursor and wdot are used in operations within/spanning
* lines to mark the other end of the affected area, or the target
* for a motion.
*/
var char *cursor;
var char *wcursor;
var line *wdot;
/*
* Undo information is saved in a LBSIZE buffer at "vutmp" for changes
* within the current line, or as for command mode for multi-line changes
* or changes on lines no longer the current line.
* The change kind "VCAPU" is used immediately after a U undo to prevent
* two successive U undo's from destroying the previous state.
*/
#define VNONE 0
#define VCHNG 1
#define VMANY 2
#define VCAPU 3
#define VMCHNG 4
#define VMANYINS 5
var short vundkind; /* Which kind of undo - from above */
var char *vutmp; /* Prev line image when "VCHNG" */
/*
* State information for undoing of macros. The basic idea is that
* if the macro does only 1 change or even none, we don't treat it
* specially. If it does 2 or more changes we want to be able to
* undo it as a unit. We remember how many changes have been made
* within the current macro. (Remember macros can be nested.)
*/
#define VC_NOTINMAC 0 /* Not in a macro */
#define VC_NOCHANGE 1 /* In a macro, no changes so far */
#define VC_ONECHANGE 2 /* In a macro, one change so far */
#define VC_MANYCHANGE 3 /* In a macro, at least 2 changes so far */
var short vch_mac; /* Change state - one of the above */
/*
* For U undo's the line is grabbed by "vmove" after it first appears
* on that line. The "vUNDdot" which specifies which line has been
* saved is selectively cleared when changes involving other lines
* are made, i.e. after a 'J' join. This is because a 'JU' would
* lose completely the text of the line just joined on.
*/
var char *vUNDcurs; /* Cursor just before 'U' */
var line *vUNDdot; /* The line address of line saved in vUNDsav */
var line vUNDsav; /* Grabbed initial "*dot" */
#define killU() vUNDdot = NOLINE
/*
* There are a number of cases where special behaviour is needed
* from deeply nested routines. This is accomplished by setting
* the bits of hold, which acts to change the state of the general
* visual editing behaviour in specific ways.
*
* HOLDAT prevents the clreol (clear to end of line) routines from
* putting out @'s or ~'s on empty lines.
*
* HOLDDOL prevents the reopen routine from putting a '$' at the
* end of a reopened line in list mode (for hardcopy mode, e.g.).
*
* HOLDROL prevents spurious blank lines when scrolling in hardcopy
* open mode.
*
* HOLDQIK prevents the fake insert mode during repeated commands.
*
* HOLDPUPD prevents updating of the physical screen image when
* mucking around while in insert mode.
*
* HOLDECH prevents clearing of the echo area while rolling the screen
* backwards (e.g.) in deference to the clearing of the area at the
* end of the scroll (1 time instead of n times). The fact that this
* is actually needed is recorded in heldech, which says that a clear
* of the echo area was actually held off.
*/
var short hold;
var short holdupd; /* Hold off update when echo line is too long */
#define HOLDAT 1
#define HOLDDOL 2
#define HOLDROL 4
#define HOLDQIK 8
#define HOLDPUPD 16
#define HOLDECH 32
#define HOLDWIG 64
/*
* Miscellaneous variables
*/
var short CDCNT; /* Count of ^D's in insert on this line */
var char DEL[VBSIZE]; /* Last deleted text */
var bool HADUP; /* This insert line started with ^ then ^D */
var bool HADZERO; /* This insert line started with 0 then ^D */
var char INS[VBSIZE]; /* Last inserted text */
var int Vlines; /* Number of file lines "before" vi command */
var int Xcnt; /* External variable holding last cmd's count */
var bool Xhadcnt; /* Last command had explicit count? */
var short ZERO;
var short dir; /* Direction for search (+1 or -1) */
var short doomed; /* Disply chars right of cursor to be killed */
var bool gobblebl; /* Wrapmargin space generated nl, eat a space */
var bool hadcnt; /* (Almost) internal to vmain() */
var bool heldech; /* We owe a clear of echo area */
var bool insmode; /* Are in character insert mode */
var char lastcmd[5]; /* Chars in last command */
var int lastcnt; /* Count for last command */
var char *lastcp; /* Save current command here to repeat */
var bool lasthad; /* Last command had a count? */
var short lastvgk; /* Previous input key, if not from keyboard */
var short lastreg; /* Register with last command */
var char *ncols['z'-'a'+2]; /* Cursor positions of marks */
var char *notenam; /* Name to be noted with change count */
var char *notesgn; /* Change count from last command */
var char op; /* Operation of current command */
var short Peekkey; /* Peek ahead key */
var bool rubble; /* Line is filthy (in hardcopy open), redraw! */
var int vSCROLL; /* Number lines to scroll on ^D/^U */
var char *vglobp; /* Untyped input (e.g. repeat insert text) */
var char vmacbuf[VBSIZE]; /* Text of visual macro, hence nonnestable */
var char *vmacp; /* Like vglobp but for visual macros */
var char *vmcurs; /* Cursor for restore after undo d), e.g. */
var short vmovcol; /* Column to try to keep on arrow keys */
var bool vmoving; /* Are trying to keep vmovcol */
var short vreg; /* Reg for this command */ /* mjm: was char */
var short wdkind; /* Liberal/conservative words? */
var char workcmd[5]; /* Temporary for lastcmd */
/*
* Macros
*/
#define INF 30000
#define LASTLINE LINE(vcnt)
#define OVERBUF QUOTE
#define beep obeep
#define cindent() ((outline - vlinfo[vcline].vliny) * WCOLS + outcol)
#define vputp(cp, cnt) tputs(cp, cnt, vputch)
#define vputc(c) putch(c)
/*
* Function types
*/
int beep();
int qcount();
int vchange();
int vdelete();
int vgrabit();
int vinschar();
int vmove();
int vputchar();
int vshift();
int vyankit();