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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: put.c,v 1.10 2009/10/27 23:59:47 deraadt 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 <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "common.h"

/*
 * put --
 *	Put text buffer contents into the file.
 *
 * PUBLIC: int put(SCR *, CB *, CHAR_T *, MARK *, MARK *, int);
 */
int
put(sp, cbp, namep, cp, rp, append)
	SCR *sp;
	CB *cbp;
	CHAR_T *namep;
	MARK *cp, *rp;
	int append;
{
	CHAR_T name;
	TEXT *ltp, *tp;
	recno_t lno;
	size_t blen, clen, len;
	int rval;
	char *bp, *p, *t;

	if (cbp == NULL) {
		if (namep == NULL) {
			cbp = sp->gp->dcbp;
			if (cbp == NULL) {
				msgq(sp, M_ERR,
				    "053|The default buffer is empty");
				return (1);
			}
		} else {
			name = *namep;
			CBNAME(sp, cbp, name);
			if (cbp == NULL) {
				msgq(sp, M_ERR, "054|Buffer %s is empty",
				    KEY_NAME(sp, name));
				return (1);
			}
		}
	}
	tp = CIRCLEQ_FIRST(&cbp->textq);

	/*
	 * 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.
	 *
	 * !!!
	 * Historically, pasting into a file with no lines in vi would preserve
	 * the single blank line.  This is surely a result of the fact that the
	 * 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.
	 *
	 * Historical practice is that the cursor ends at the first character
	 * in the file.
	 */
	if (cp->lno == 1) {
		if (db_last(sp, &lno))
			return (1);
		if (lno == 0) {
			for (; tp != (void *)&cbp->textq;
			    ++lno, ++sp->rptlines[L_ADDED],
			    tp = CIRCLEQ_NEXT(tp, q))
				if (db_append(sp, 1, lno, tp->lb, tp->len))
					return (1);
			rp->lno = 1;
			rp->cno = 0;
			return (0);
		}
	}

	/* 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 != CIRCLEQ_END(&cbp->textq);
		    ++lno, ++sp->rptlines[L_ADDED], tp = CIRCLEQ_NEXT(tp, q))
			if (db_append(sp, 1, lno, tp->lb, tp->len))
				return (1);
		rp->cno = 0;
		(void)nonblank(sp, rp->lno, &rp->cno);
		return (0);
	}

	/*
	 * 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 (db_get(sp, lno, DBG_FATAL, &p, &len))
		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) {
		memcpy(bp, p, clen);
		p += clen;
		t += clen;
	}

	/* First line from the CB. */
	if (tp->len != 0) {
		memcpy(t, tp->lb, tp->len);
		t += tp->len;
	}

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

	/*
	 * !!!
	 * In the historical 4BSD version of vi, character mode puts within
	 * a single line have two cursor behaviors: if the put is from the
	 * unnamed buffer, the cursor moves to the character inserted which
	 * appears last in the file.  If the put is from a named buffer,
	 * the cursor moves to the character inserted which appears first
	 * in the file.  In System III/V, it was changed at some point and
	 * the cursor always moves to the first character.  In both versions
	 * of vi, character mode puts that cross line boundaries leave the
	 * cursor on the first character.  Nvi implements the System III/V
	 * behavior, and expect POSIX.2 to do so as well.
	 */
	rp->lno = lno;
	rp->cno = len == 0 ? 0 : sp->cno + (append && tp->len ? 1 : 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 (CIRCLEQ_NEXT(tp, q) == CIRCLEQ_END(&cbp->textq)) {
		if (clen > 0) {
			memcpy(t, p, clen);
			t += clen;
		}
		if (db_set(sp, lno, bp, t - bp))
			goto err;
		if (sp->rptlchange != lno) {
			sp->rptlchange = lno;
			++sp->rptlines[L_CHANGED];
		}
	} 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 = CIRCLEQ_LAST(&cbp->textq);
		len = t - bp;
		ADD_SPACE_RET(sp, bp, blen, ltp->len + clen);
		t = bp + len;

		/* Add in last part of the CB. */
		memcpy(t, ltp->lb, ltp->len);
		if (clen)
			memcpy(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 (db_set(sp, lno, bp, t - bp))
			goto err;
		if (sp->rptlchange != lno) {
			sp->rptlchange = lno;
			++sp->rptlines[L_CHANGED];
		}

		/* Output any intermediate lines in the CB. */
		for (tp = CIRCLEQ_NEXT(tp, q);
		    CIRCLEQ_NEXT(tp, q) != CIRCLEQ_END(&cbp->textq);
		    ++lno, ++sp->rptlines[L_ADDED], tp = CIRCLEQ_NEXT(tp, q))
			if (db_append(sp, 1, lno, tp->lb, tp->len))
				goto err;

		if (db_append(sp, 1, lno, t, clen))
			goto err;
		++sp->rptlines[L_ADDED];
	}
	rval = 0;

	if (0)
err:		rval = 1;

	FREE_SPACE(sp, bp, blen);
	return (rval);
}