usr/src/contrib/nvi.1.14/vi/v_replace.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[] = "@(#)v_replace.c 8.16 (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 <errno.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"
#include "vcmd.h"

/*
 * v_replace -- [count]rc
 *
 * !!!
 * The r command in historic vi was almost beautiful in its badness.  For
 * example, "r<erase>" and "r<word erase>" beeped the terminal and deleted
 * a single character.  "Nr<carriage return>", where N was greater than 1,
 * inserted a single carriage return.  This may not be right, but at least
 * it's not insane.
 */
int
v_replace(sp, ep, vp)
        SCR *sp;
        EXF *ep;
        VICMDARG *vp;
{
        CH ikey;
        TEXT *tp;
        recno_t lno;
        size_t blen, len;
        u_long cnt;
        int rval;
        char *bp, *p;

        /*
         * If the line doesn't exist, or it's empty, replacement isn't
         * allowed.  It's not hard to implement, but:
         *
         *      1: It's historic practice.
         *      2: For consistency, this change would require that the more
         *         general case, "Nr", when the user is < N characters from
         *         the end of the line, also work.
         *      3: Replacing a newline has somewhat odd semantics.
         */
        if ((p = file_gline(sp, ep, vp->m_start.lno, &len)) == NULL) {
                if (file_lline(sp, ep, &lno))
                        return (1);
                if (lno != 0) {
                        GETLINE_ERR(sp, vp->m_start.lno);
                        return (1);
                }
                goto nochar;
        }
        if (len == 0) {
nochar:         msgq(sp, M_BERR, "No characters to replace.");
                return (1);
        }

        /*
         * Figure out how many characters to be replace.  For no particular
         * reason (other than that the semantics of replacing the newline
         * are confusing) only permit the replacement of the characters in
         * the current line.  I suppose we could append replacement characters
         * to the line, but I see no compelling reason to do so.
         */
        cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
        vp->m_stop.lno = vp->m_start.lno;
        vp->m_stop.cno = vp->m_start.cno + cnt - 1;
        if (vp->m_stop.cno > len - 1) {
                v_eol(sp, ep, &vp->m_start);
                return (1);
        }

        /*
         * Get the character.  Literal escapes escape any character,
         * single escapes return.
         */
        if (F_ISSET(vp, VC_ISDOT)) {
                ikey.ch = VIP(sp)->rlast;
                ikey.value = KEY_VAL(sp, ikey.ch);
        } else {
                if (term_key(sp, &ikey, 0) != INP_OK)
                        return (1);
                switch (ikey.value) {
                case K_ESCAPE:
                        return (0);
                case K_VLNEXT:
                        if (term_key(sp, &ikey, 0) != INP_OK)
                                return (1);
                        break;
                }
                VIP(sp)->rlast = ikey.ch;
        }

        /* Copy the line. */
        GET_SPACE_RET(sp, bp, blen, len);
        memmove(bp, p, len);
        p = bp;

        if (ikey.value == K_CR || ikey.value == K_NL) {
                /* Set return line. */
                vp->m_stop.lno = vp->m_start.lno + cnt;
                vp->m_stop.cno = 0;

                /* The first part of the current line. */
                if (file_sline(sp, ep, vp->m_start.lno, p, vp->m_start.cno))
                        goto err_ret;

                /*
                 * The rest of the current line.  And, of course, now it gets
                 * tricky.  Any white space after the replaced character is
                 * stripped, and autoindent is applied.  Put the cursor on the
                 * last indent character as did historic vi.
                 */
                for (p += vp->m_start.cno + cnt, len -= vp->m_start.cno + cnt;
                    len && isblank(*p); --len, ++p);

                if ((tp = text_init(sp, p, len, len)) == NULL)
                        goto err_ret;
                if (txt_auto(sp, ep, vp->m_start.lno, NULL, 0, tp))
                        goto err_ret;
                vp->m_stop.cno = tp->ai ? tp->ai - 1 : 0;
                if (file_aline(sp, ep, 1, vp->m_start.lno, tp->lb, tp->len))
                        goto err_ret;
                text_free(tp);

                rval = 0;

                /* All of the middle lines. */
                while (--cnt)
                        if (file_aline(sp, ep, 1, vp->m_start.lno, "", 0)) {
err_ret:                        rval = 1;
                                break;
                        }
        } else {
                memset(bp + vp->m_start.cno, ikey.ch, cnt);
                rval = file_sline(sp, ep, vp->m_start.lno, bp, len);
        }
        FREE_SPACE(sp, bp, blen);

        vp->m_final = vp->m_stop;
        return (rval);
}