/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */


/* Copyright (c) 1981 Regents of the University of California */

#include "ex.h"
#include "ex_re.h"
#include "ex_tty.h"
#include "ex_vis.h"

/*
 * Entry points to open and visual from command mode processor.
 * The open/visual code breaks down roughly as follows:
 *
 * ex_v.c       entry points, checking of terminal characteristics
 *
 * ex_vadj.c    logical screen control, use of intelligent operations
 *              insert/delete line and coordination with screen image;
 *              updating of screen after changes.
 *
 * ex_vget.c    input of single keys and reading of input lines
 *              from the echo area, handling of \ escapes on input for
 *              uppercase only terminals, handling of memory for repeated
 *              commands and small saved texts from inserts and partline
 *              deletes, notification of multi line changes in the echo
 *              area.
 *
 * ex_vmain.c   main command decoding, some command processing.
 *
 * ex_voperate.c   decoding of operator/operand sequences and
 *              contextual scans, implementation of word motions.
 *
 * ex_vops.c    major operator interfaces, undos, motions, deletes,
 *              changes, opening new lines, shifts, replacements and yanks
 *              coordinating logical and physical changes.
 *
 * ex_vops2.c   subroutines for operator interfaces in ex_vops.c,
 *              insert mode, read input line processing at lowest level.
 *
 * ex_vops3.c   structured motion definitions of ( ) { } and [ ] operators,
 *              indent for lisp routines, () and {} balancing.
 *
 * ex_vput.c    output routines, clearing, physical mapping of logical cursor
 *              positioning, cursor motions, handling of insert character
 *              and delete character functions of intelligent and unintelligent
 *              terminals, visual mode tracing routines (for debugging),
 *              control of screen image and its updating.
 *
 * ex_vwind.c   window level control of display, forward and backward rolls,
 *              absolute motions, contextual displays, line depth determination
 */

void setsize();
void winch();
void vintr();
void ovend(ttymode);

wchar_t atube[TUBESIZE];
jmp_buf venv;
int windowchg;
int sigok;

/* reinitialize window size after SIGWINCH */
void windowinit()
{
        windowchg = 0;
        setsize();
        if(value(vi_WINDOW) >= lines || options[vi_WINDOW].odefault == value(vi_WINDOW))
                value(vi_WINDOW) = lines -1;
        options[vi_WINDOW].odefault = lines - 1;
        if(options[vi_SCROLL].odefault == value(vi_SCROLL))
                value(vi_SCROLL) = value(vi_WINDOW)/2;
        options[vi_SCROLL].odefault = (lines - 1)/2;
        vsetsiz(value(vi_WINDOW));
        setwind();
        vok(atube, 1);
}

void redraw()
{
        vsave();
        windowinit();
        vclear();
        vdirty(0, lines);
        if(state != VISUAL) {
                vclean();
                vmoveto(dot, cursor, 0);
        } else {
                vredraw(WTOP);
                vrepaint(cursor);
                vfixcurs();
        }
}

/*ARGSUSED*/
void
#ifdef __STDC__
winch(int sig)
#else
winch(sig)
int sig;
#endif
{
        struct winsize jwin;
        int l;

        if(ioctl(0, TIOCGWINSZ, &jwin) != -1) {
#ifdef XPG4
                oldlines = jwin.ws_row;
                oldcolumns = jwin.ws_col;
#endif /* XPG4 */
                if (sigok) {
                        if (columns != jwin.ws_col || lines != jwin.ws_row)
                            redraw();
                }
        }
        else
                windowchg++;
        (void)signal(SIGWINCH, winch);
}

void
setsize()
{
        struct winsize jwin;
        int l;

        if(ioctl(0, TIOCGWINSZ, &jwin) != -1) {
                if (jwin.ws_col > 0)
                        columns = jwin.ws_col;
                if (jwin.ws_row > 0)
                        lines = jwin.ws_row;
        }

#ifdef XPG4
        if (envlines != -1) {
                lines = envlines;
        }

        if (envcolumns != -1) {
                columns = envcolumns;
        }

        if (envlines != -1 || envcolumns != -1) {
                jwin.ws_row = lines;
                jwin.ws_col = columns;

                if (ioctl(0, TIOCSWINSZ, &jwin) == -1) {
                        jwin.ws_row = oldlines;
                        jwin.ws_col = oldcolumns;

                        ioctl(0, TIOCSWINSZ, &jwin);
                }
        }
#endif /* XPG4 */

        if (lines <= 1)
                lines = 24;
        l = lines;
        if (columns <= 4)
                columns = 1000;
        value(vi_WINDOW) = options[vi_WINDOW].odefault = l - 1;
}

/*
 * Enter open mode
 */
void
oop(void)
{
        unsigned char *ic;
        ttymode f;      /* was register */
        int resize;

        windowchg = 0;
        (void)signal(SIGWINCH, winch);
        ovbeg();
        if (peekchar() == '/') {
                (void)vi_compile(getchar(), 1);
                savere(&scanre);
                if (execute(0, dot) == 0)
                        error(value(vi_TERSE) ? gettext("Fail") :
gettext("Pattern not found on addressed line"));
                ic = (unsigned char *)loc1;
                if (ic > linebuf && *ic == 0)
                        ic--;
        } else {
                getDOT();
                ic = vskipwh(linebuf);
        }
        donewline();

        /*
         * If overstrike then have to HARDOPEN
         * else if can move cursor up off current line can use CRTOPEN (~~vi1)
         * otherwise have to use ONEOPEN (like adm3)
         */
        if (over_strike && !erase_overstrike)
                bastate = HARDOPEN;
        else if (cursor_address || cursor_up)
                bastate = CRTOPEN;
        else
                bastate = ONEOPEN;
        setwind();

        /*
         * To avoid bombing on glass-crt's when the line is too long
         * pretend that such terminals are 160 columns wide.
         * If a line is too wide for display, we will dynamically
         * switch to hardcopy open mode.
         */
        if (state != CRTOPEN)
                WCOLS = TUBECOLS;
        if (!inglobal)
                savevis();
        vok(atube, 0);
        if (state != CRTOPEN)
                columns = WCOLS;
        Outchar = vputchar;
        f = ostart();
        if (state == CRTOPEN) {
                if (outcol == UKCOL)
                        outcol = 0;
                vmoveitup(1, 1);
        } else
                outline = destline = WBOT;
        vshow(dot, NOLINE);
        vnline(ic);
        vmain();
        if (state != CRTOPEN)
                vclean();
        Command = (unsigned char *)"open";
        ovend(f);
        (void)signal(SIGWINCH, SIG_DFL);
}

void
ovbeg(void)
{

        if (inopen)
                error(gettext("Recursive open/visual not allowed"));
        Vlines = lineDOL();
        fixzero();
        setdot();
        pastwh();
        dot = addr2;
}

void
ovend(ttymode f)
{

        splitw++;
        vgoto(WECHO, 0);
        vclreol();
        vgoto(WECHO, 0);
        holdcm = 0;
        splitw = 0;
        ostop(f);
        setoutt();
        undvis();
        columns = OCOLUMNS;
        inopen = 0;
        flusho();
        netchHAD(Vlines);
}

/*
 * Enter visual mode
 */
void
vop(void)
{
        int c;
        ttymode f;      /* was register */
        extern unsigned char termtype[];

        if (!cursor_address && !cursor_up) {
                if (initev) {
toopen:
                        if (generic_type)
                                merror(gettext("I don't know what kind of terminal you are on - all I have is '%s'."), termtype);
                        putNFL();
                        merror(gettext("[Using open mode]"));
                        putNFL();
                        oop();
                        return;
                }
                error(gettext("Visual needs addressable cursor or upline capability"));
        }
        if (over_strike && !erase_overstrike) {
                if (initev)
                        goto toopen;
                error(gettext("Can't use visual on a terminal which overstrikes"));
        }
        if (!clear_screen) {
                if (initev)
                        goto toopen;
                error(gettext("Visual requires clear screen capability"));
        }
        if (!scroll_forward) {
                if (initev)
                        goto toopen;
                error(gettext("Visual requires scrolling"));
        }
        windowchg = 0;
        (void)signal(SIGWINCH, winch);
        ovbeg();
        bastate = VISUAL;
        c = 0;
        if (any(peekchar(), "+-^."))
                c = getchar();
        pastwh();
        vsetsiz(isdigit(peekchar()) ? getnum() : value(vi_WINDOW));
        setwind();
        donewline();
        vok(atube, 0);
        if (!inglobal)
                savevis();
        Outchar = vputchar;
        vmoving = 0;
        f = ostart();
        if (initev == 0) {
                vcontext(dot, c);
                vnline((unsigned char *)NOSTR);
        }
        vmain();
        Command = (unsigned char *)"visual";
        ovend(f);
        (void)signal(SIGWINCH, SIG_DFL);
}

/*
 * Hack to allow entry to visual with
 * empty buffer since routines internally
 * demand at least one line.
 */
void
fixzero(void)
{

        if (dol == zero) {
                bool ochng = chng;

                vdoappend((unsigned char *)"");
                if (!ochng)
                        sync();
                addr1 = addr2 = one;
        } else if (addr2 == zero)
                addr2 = one;
}

/*
 * Save lines before visual between unddol and truedol.
 * Accomplish this by throwing away current [unddol,truedol]
 * and then saving all the lines in the buffer and moving
 * unddol back to dol.  Don't do this if in a global.
 *
 * If you do
 *      g/xxx/vi.
 * and then do a
 *      :e xxxx
 * at some point, and then quit from the visual and undo
 * you get the old file back.  Somewhat weird.
 */
void
savevis(void)
{

        if (inglobal)
                return;
        truedol = unddol;
        saveall();
        unddol = dol;
        undkind = UNDNONE;
}

/*
 * Restore a sensible state after a visual/open, moving the saved
 * stuff back to [unddol,dol], and killing the partial line kill indicators.
 */
void
undvis(void)
{

        if (ruptible)
                signal(SIGINT, onintr);
        squish();
        pkill[0] = pkill[1] = 0;
        unddol = truedol;
        unddel = zero;
        undap1 = one;
        undap2 = dol + 1;
        undkind = UNDALL;
        if (undadot <= zero || undadot > dol)
                undadot = zero+1;
}

/*
 * Set the window parameters based on the base state bastate
 * and the available buffer space.
 */
void
setwind(void)
{

        WCOLS = columns;
        switch (bastate) {

        case ONEOPEN:
                if (auto_right_margin)
                        WCOLS--;
                /* FALLTHROUGH */

        case HARDOPEN:
                basWTOP = WTOP = WBOT = WECHO = 0;
                ZERO = 0;
                holdcm++;
                break;

        case CRTOPEN:
                basWTOP = lines - 2;
                /* FALLTHROUGH */

        case VISUAL:
                ZERO = lines - TUBESIZE / WCOLS;
                if (ZERO < 0)
                        ZERO = 0;
                if (ZERO > basWTOP)
                        error(gettext("Screen too large for internal buffer"));
                WTOP = basWTOP; WBOT = lines - 2; WECHO = lines - 1;
                break;
        }
        state = bastate;
        basWLINES = WLINES = WBOT - WTOP + 1;
}

/*
 * Can we hack an open/visual on this terminal?
 * If so, then divide the screen buffer up into lines,
 * and initialize a bunch of state variables before we start.
 */
static unsigned char vlinebuf[LBSIZE];

void
vok(wchar_t *atube, int undo)
{
        int i;
        static int beenhere;

        if (WCOLS == 1000)
                serror((unsigned char *)
                    gettext("Don't know enough about your terminal to use %s"),
                    Command);
        if (WCOLS > TUBECOLS)
                error(gettext("Terminal too wide"));
        if (WLINES >= TUBELINES || WCOLS * (WECHO - ZERO + 1) > TUBESIZE)
                error(gettext("Screen too large"));

        vtube0 = atube;
        if(beenhere)
                vclrbyte(atube, WCOLS * (WECHO - ZERO + 1));
        for (i = 0; i < ZERO; i++)
                vtube[i] = (wchar_t *) 0;
        for (; i <= WECHO; i++)
                vtube[i] = atube, atube += WCOLS;
        if(beenhere++) {
                for (; i < TUBELINES; i++)
                        vtube[i] = (wchar_t *) 0;
        }
        vutmp = vlinebuf;
        if(!undo) {
                vundkind = VNONE;
                vUNDdot = 0;
        }
        OCOLUMNS = columns;
        inopen = 1;
#ifdef CBREAK
        signal(SIGINT, vintr);
#endif
        vmoving = 0;
        splitw = 0;
        doomed = 0;
        holdupd = 0;
        if(!undo)
                Peekkey = 0;
        vcnt = vcline = 0;
        if (vSCROLL == 0)
                vSCROLL = value(vi_SCROLL);
}

#ifdef CBREAK
/*ARGSUSED*/
void
#ifdef __STDC__
vintr(int sig)
#else
vintr(sig)
int sig;
#endif
{

        signal(SIGINT, vintr);
        if (vcatch)
                onintr(0);
        ungetkey(ATTN);
        draino();
}
#endif

/*
 * Set the size of the screen to size lines, to take effect the
 * next time the screen is redrawn.
 */
void
vsetsiz(int size)
{
        int b;

        if (bastate != VISUAL)
                return;
        b = lines - 1 - size;
        if (b >= lines - 1)
                b = lines - 2;
        if (b < 0)
                b = 0;
        basWTOP = b;
        basWLINES = WBOT - b + 1;
}