usr/src/contrib/nvi.1.14/put.c

/*-
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)put.c       8.4 (Berkeley) 4/9/94";
#endif /* not lint */

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

#include <bitstring.h>
#include <ctype.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>

#include "compat.h"
#include <db.h>
#include <regex.h>

#include "vi.h"

/*
 * put --
 *      Put text buffer contents into the file.
 *
 * !!!
 * Historically, pasting into a file with no lines in vi would preserve
 * the single blank line.  This is almost certainly a result of the fact
 * that historic vi couldn't deal with a file that had no lines in it.
 * This implementation treats that as a bug, and does not retain the blank
 * line.
 */
int
put(sp, ep, cbp, namep, cp, rp, append)
        SCR *sp;
        EXF *ep;
        CB *cbp;
        CHAR_T *namep;
        MARK *cp, *rp;
        int append;
{
        CHAR_T name;
        TEXT *ltp, *tp;
        recno_t lno;
        size_t blen, clen, len;
        char *bp, *p, *t;

        if (cbp == NULL)
                if (namep == NULL) {
                        cbp = sp->gp->dcbp;
                        if (cbp == NULL) {
                                msgq(sp, M_ERR, "The default buffer is empty.");
                                return (1);
                        }
                } else {
                        name = *namep;
                        CBNAME(sp, cbp, name);
                        if (cbp == NULL) {
                                msgq(sp, M_ERR,
                                    "Buffer %s is empty.", KEY_NAME(sp, name));
                                return (1);
                        }
                }
        tp = cbp->textq.cqh_first;

        /*
         * It's possible to do a put into an empty file, meaning that the
         * cut buffer simply becomes the file.  It's a special case so
         * that we can ignore it in general.
         *
         * Historical practice is that the cursor ends up on the first
         * non-blank character of the first line inserted.
         */
        if (cp->lno == 1) {
                if (file_lline(sp, ep, &lno))
                        return (1);
                if (lno == 0) {
                        for (; tp != (void *)&cbp->textq;
                             ++lno, tp = tp->q.cqe_next)
                                if (file_aline(sp, ep, 1, lno, tp->lb, tp->len))
                                        return (1);
                        rp->lno = 1;
                        rp->cno = 0;
                        (void)nonblank(sp, ep, rp->lno, &rp->cno);
                        goto ret;
                }
        }

        /* If a line mode buffer, append each new line into the file. */
        if (F_ISSET(cbp, CB_LMODE)) {
                lno = append ? cp->lno : cp->lno - 1;
                rp->lno = lno + 1;
                for (; tp != (void *)&cbp->textq; ++lno, tp = tp->q.cqe_next)
                        if (file_aline(sp, ep, 1, lno, tp->lb, tp->len))
                                return (1);
                rp->cno = 0;
                (void)nonblank(sp, ep, rp->lno, &rp->cno);
                goto ret;
        }

        /*
         * If buffer was cut in character mode, replace the current line with
         * one built from the portion of the first line to the left of the
         * split plus the first line in the CB.  Append each intermediate line
         * in the CB.  Append a line built from the portion of the first line
         * to the right of the split plus the last line in the CB.
         *
         * Get the first line.
         */
        lno = cp->lno;
        if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
                GETLINE_ERR(sp, lno);
                return (1);
        }

        GET_SPACE_RET(sp, bp, blen, tp->len + len + 1);
        t = bp;

        /* Original line, left of the split. */
        if (len > 0 && (clen = cp->cno + (append ? 1 : 0)) > 0) {
                memmove(bp, p, clen);
                p += clen;
                t += clen;
        }

        /* First line from the CB. */
        memmove(t, tp->lb, tp->len);
        t += tp->len;

        /* Calculate length left in original line. */
        clen = len ? len - cp->cno - (append ? 1 : 0) : 0;

        /*
         * If no more lines in the CB, append the rest of the original
         * line and quit.  Otherwise, build the last line before doing
         * the intermediate lines, because the line changes will lose
         * the cached line.
         */
        if (tp->q.cqe_next == (void *)&cbp->textq) {
                /*
                 * Historical practice is that if a non-line mode put
                 * is inside a single line, the cursor ends up on the
                 * last character inserted.
                 */
                rp->lno = lno;
                rp->cno = (t - bp) - 1;

                if (clen > 0) {
                        memmove(t, p, clen);
                        t += clen;
                }
                if (file_sline(sp, ep, lno, bp, t - bp))
                        goto mem;
        } else {
                /*
                 * Have to build both the first and last lines of the
                 * put before doing any sets or we'll lose the cached
                 * line.  Build both the first and last lines in the
                 * same buffer, so we don't have to have another buffer
                 * floating around.
                 *
                 * Last part of original line; check for space, reset
                 * the pointer into the buffer.
                 */
                ltp = cbp->textq.cqh_last;
                len = t - bp;
                ADD_SPACE_RET(sp, bp, blen, ltp->len + clen);
                t = bp + len;

                /* Add in last part of the CB. */
                memmove(t, ltp->lb, ltp->len);
                if (clen)
                        memmove(t + ltp->len, p, clen);
                clen += ltp->len;

                /*
                 * Now: bp points to the first character of the first
                 * line, t points to the last character of the last
                 * line, t - bp is the length of the first line, and
                 * clen is the length of the last.  Just figured you'd
                 * want to know.
                 *
                 * Output the line replacing the original line.
                 */
                if (file_sline(sp, ep, lno, bp, t - bp))
                        goto mem;

                /*
                 * Historical practice is that if a non-line mode put
                 * covers multiple lines, the cursor ends up on the
                 * first character inserted.  (Of course.)
                 */
                rp->lno = lno;
                rp->cno = (t - bp) - 1;

                /* Output any intermediate lines in the CB. */
                for (tp = tp->q.cqe_next;
                    tp->q.cqe_next != (void *)&cbp->textq;
                    ++lno, tp = tp->q.cqe_next)
                        if (file_aline(sp, ep, 1, lno, tp->lb, tp->len))
                                goto mem;

                if (file_aline(sp, ep, 1, lno, t, clen)) {
mem:                    FREE_SPACE(sp, bp, blen);
                        return (1);
                }
        }
        FREE_SPACE(sp, bp, blen);

        /* Reporting... */
ret:    sp->rptlines[L_PUT] += lno - cp->lno;

        return (0);
}