/*      $OpenBSD: ex_move.c,v 1.12 2025/08/23 21:02:10 millert Exp $    */

/*-
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *      Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/queue.h>

#include <bitstring.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../common/common.h"

/*
 * ex_copy -- :[line [,line]] co[py] line [flags]
 *      Copy selected lines.
 *
 * PUBLIC: int ex_copy(SCR *, EXCMD *);
 */
int
ex_copy(SCR *sp, EXCMD *cmdp)
{
        CB cb;
        MARK fm1, fm2, m, tm;
        recno_t cnt;
        int rval;

        rval = 0;

        NEEDFILE(sp, cmdp);

        /*
         * It's possible to copy things into the area that's being
         * copied, e.g. "2,5copy3" is legitimate.  Save the text to
         * a cut buffer.
         */
        fm1 = cmdp->addr1;
        fm2 = cmdp->addr2;
        memset(&cb, 0, sizeof(cb));
        TAILQ_INIT(&cb.textq);
        for (cnt = fm1.lno; cnt <= fm2.lno; ++cnt)
                if (cut_line(sp, cnt, 0, CUT_LINE_TO_EOL, &cb)) {
                        rval = 1;
                        goto err;
                }
        cb.flags |= CB_LMODE;

        /* Put the text into place. */
        tm.lno = cmdp->lineno;
        tm.cno = 0;
        if (put(sp, &cb, NULL, &tm, &m, 1, 1))
                rval = 1;
        else {
                /*
                 * Copy puts the cursor on the last line copied.  The cursor
                 * returned by the put routine is the first line put, not the
                 * last, because that's the historic semantic of vi.
                 */
                cnt = (fm2.lno - fm1.lno) + 1;
                sp->lno = m.lno + (cnt - 1);
                sp->cno = 0;
        }
err:    text_lfree(&cb.textq);
        return (rval);
}

/*
 * ex_move -- :[line [,line]] mo[ve] line
 *      Move selected lines.
 *
 * PUBLIC: int ex_move(SCR *, EXCMD *);
 */
int
ex_move(SCR *sp, EXCMD *cmdp)
{
        LMARK *lmp;
        MARK fm1, fm2;
        recno_t cnt, diff, fl, tl, mfl, mtl;
        size_t blen, len;
        int mark_reset;
        char *bp, *p;

        NEEDFILE(sp, cmdp);

        /*
         * It's not possible to move things into the area that's being
         * moved.
         */
        fm1 = cmdp->addr1;
        fm2 = cmdp->addr2;
        if (cmdp->lineno >= fm1.lno && cmdp->lineno <= fm2.lno) {
                msgq(sp, M_ERR, "Destination line is inside move range");
                return (1);
        }

        /*
         * Log the positions of any marks in the to-be-deleted lines.  This
         * has to work with the logging code.  What happens is that we log
         * the old mark positions, make the changes, then log the new mark
         * positions.  Then the marks end up in the right positions no matter
         * which way the log is traversed.
         *
         * XXX
         * Reset the MARK_USERSET flag so that the log can undo the mark.
         * This isn't very clean, and should probably be fixed.
         */
        fl = fm1.lno;
        tl = cmdp->lineno;

        /* Log the old positions of the marks. */
        mark_reset = 0;
        LIST_FOREACH(lmp, &sp->ep->marks, q)
                if (lmp->name != ABSMARK1 &&
                    lmp->lno >= fl && lmp->lno <= tl) {
                        mark_reset = 1;
                        F_CLR(lmp, MARK_USERSET);
                        (void)log_mark(sp, lmp);
                }

        /* Get memory for the copy. */
        GET_SPACE_RET(sp, bp, blen, 256);

        /* Move the lines. */
        diff = (fm2.lno - fm1.lno) + 1;
        if (tl > fl) {                          /* Destination > source. */
                mfl = tl - diff;
                mtl = tl;
                for (cnt = diff; cnt--;) {
                        if (db_get(sp, fl, DBG_FATAL, &p, &len))
                                return (1);
                        BINC_RET(sp, bp, blen, len);
                        memcpy(bp, p, len);
                        if (db_append(sp, 1, tl, bp, len))
                                return (1);
                        if (mark_reset)
                                LIST_FOREACH(lmp, &sp->ep->marks, q)
                                        if (lmp->name != ABSMARK1 &&
                                            lmp->lno == fl)
                                                lmp->lno = tl + 1;
                        if (db_delete(sp, fl))
                                return (1);
                }
        } else {                                /* Destination < source. */
                mfl = tl;
                mtl = tl + diff;
                for (cnt = diff; cnt--;) {
                        if (db_get(sp, fl, DBG_FATAL, &p, &len))
                                return (1);
                        BINC_RET(sp, bp, blen, len);
                        memcpy(bp, p, len);
                        if (db_append(sp, 1, tl++, bp, len))
                                return (1);
                        if (mark_reset)
                                LIST_FOREACH(lmp, &sp->ep->marks, q)
                                        if (lmp->name != ABSMARK1 &&
                                            lmp->lno == fl)
                                                lmp->lno = tl;
                        ++fl;
                        if (db_delete(sp, fl))
                                return (1);
                }
        }
        FREE_SPACE(sp, bp, blen);

        sp->lno = tl;                           /* Last line moved. */
        sp->cno = 0;

        /* Log the new positions of the marks. */
        if (mark_reset)
                LIST_FOREACH(lmp, &sp->ep->marks, q)
                        if (lmp->name != ABSMARK1 &&
                            lmp->lno >= mfl && lmp->lno <= mtl)
                                (void)log_mark(sp, lmp);


        sp->rptlines[L_MOVED] += diff;
        return (0);
}