usr/src/contrib/nvi/nvi/vi/v_at.c

/*-
 * Copyright (c) 1991, 1993
 *      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_at.c      8.1 (Berkeley) 6/9/93";
#endif /* not lint */

#include <sys/types.h>

#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "vi.h"
#include "vcmd.h"

int
v_at(sp, ep, vp, fm, tm, rp)
        SCR *sp;
        EXF *ep;
        VICMDARG *vp;
        MARK *fm, *tm, *rp;
{
        CB *cb;
        TEXT *tp;
        size_t len, remain;
        int key;
        char *p, *start;

        key = vp->character;
        CBNAME(sp, key, cb);
        CBEMPTY(sp, key, cb);

        if (sp->atkey_len == 0)
                memset(sp->atkey_stack, 0, sizeof(sp->atkey_stack));
        else if (sp->atkey_stack[key]) {
                msgq(sp, M_ERR, "Buffer %s already occurs in this command.",
                    charname(sp, key));
                return (1);
        }

        /* Get buffer for rest of at string plus cut buffer. */
        remain = sp->atkey_len ?
            sp->atkey_len - (sp->atkey_cur - sp->atkey_buf) : 0;

        /* Check for overflow. */
        len = cb->len + remain;
        if (len < cb->len + remain) {
                msgq(sp, M_ERR, "Buffer overflow.");
                return (1);
        }

        if ((start = p = malloc(len)) == NULL) {
                msgq(sp, M_ERR, "Error: %s", strerror(errno));
                return (1);
        }

        /* Copy into the new buffer. */
        for (tp = cb->txthdr.next; tp != (TEXT *)&cb->txthdr; tp = tp->next) {
                memmove(p, tp->lb, tp->len);
                p += tp->len;
                *p++ = '\n';
        }

        /* Copy the rest of the current at string into place. */
        if (sp->atkey_len != 0) {
                memmove(p, sp->atkey_cur, remain);
                free(sp->atkey_buf);

        }
        /* Fix the pointers. */
        sp->atkey_buf = sp->atkey_cur = start;
        sp->atkey_len = len;

        sp->atkey_stack[key] = 1;

        *rp = *fm;
        return (0);
}