vi/port/ex_v.c

/*
 * 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 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#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--;
        /* fall into ... */

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

    case CRTOPEN:
        basWTOP = lines - 2;
        /* fall into */

    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;
}