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- /* Copyright (c) 1979 Regents of the University of California */
- /*
- * Ex version 2
- * Bill Joy UCB
- * February, 1979
- *
- * 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.
- */
-
- short bastate;
- 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.
- */
- short basWTOP;
- short basWLINES;
- short WTOP;
- short WBOT;
- short WLINES;
- short WCOLS;
- 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.
- */
- 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 {
- char vliny; /* Y coordinate */
- char vdepth; /* Depth of displayed line */
- short vflags; /* Is line potentially dirty ? */
- } 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.
- */
- short vcline;
- 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.
- */
- char *vtube[TUBELINES];
- 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.
- */
- char *cursor;
- char *wcursor;
- 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
-
- short vundkind; /* Which kind of undo - from above */
- char *vutmp; /* Prev line image when "VCHNG" */
-
- /*
- * 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.
- */
- char *vUNDcurs; /* Cursor just before 'U' */
- line *vUNDdot; /* The line address of line saved in vUNDsav */
- 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.
- */
- short hold;
- 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
- */
- short CDCNT; /* Count of ^D's in insert on this line */
- char DEL[VBSIZE]; /* Last deleted text */
- bool HADUP; /* This insert line started with ^ then ^D */
- bool HADZERO; /* This insert line started with 0 then ^D */
- char INS[VBSIZE]; /* Last inserted text */
- short Vlines; /* Number of file lines "before" vi command */
- short Xcnt; /* External variable holding last cmd's count */
- bool Xhadcnt; /* Last command had explicit count? */
- short ZERO;
- short dir; /* Direction for search (+1 or -1) */
- short doomed; /* Disply chars right of cursor to be killed */
- bool gobblebl; /* Wrapmargin space generated nl, eat a space */
- bool hadcnt; /* (Almost) internal to vmain() */
- bool heldech; /* We owe a clear of echo area */
- bool insmode; /* Are in character insert mode */
- char lastcmd[5]; /* Chars in last command */
- short lastcnt; /* Count for last command */
- char *lastcp; /* Save current command here to repeat */
- bool lasthad; /* Last command had a count? */
- short lastreg; /* Register with last command */
- char *ncols['z'-'a'+1]; /* Cursor positions of marks */
- char *notenam; /* Name to be noted with change count */
- char *notesgn; /* Change count from last command */
- char op; /* Operation of current command */
- short Peekkey; /* Peek ahead key */
- bool rubble; /* Line is filthy (in hardcopy open), redraw! */
- short vSCROLL; /* Number lines to scroll on ^D/^U */
- char *vglobp; /* Untyped input (e.g. repeat insert text) */
- char *vmcurs; /* Cursor for restore after undo d), e.g. */
- short vmovcol; /* Column to try to keep on arrow keys */
- bool vmoving; /* Are trying to keep vmovcol */
- char vreg; /* Register for this command */
- short wdkind; /* Liberal/conservative words? */
- 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();
-