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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: ex_join.c,v 1.6 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/common.h"

/*
 * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
 *	Join lines.
 *
 * PUBLIC: int ex_join(SCR *, EXCMD *);
 */
int
ex_join(sp, cmdp)
	SCR *sp;
	EXCMD *cmdp;
{
	recno_t from, to;
	size_t blen, clen, len, tlen;
	int echar, extra, first;
	char *bp, *p, *tbp;

	NEEDFILE(sp, cmdp);

	from = cmdp->addr1.lno;
	to = cmdp->addr2.lno;

	/* Check for no lines to join. */
	if (!db_exist(sp, from + 1)) {
		msgq(sp, M_ERR, "131|No following lines to join");
		return (1);
	}

	GET_SPACE_RET(sp, bp, blen, 256);

	/*
	 * The count for the join command was off-by-one,
	 * historically, to other counts for other commands.
	 */
	if (FL_ISSET(cmdp->iflags, E_C_COUNT))
		++cmdp->addr2.lno;

	/*
	 * If only a single address specified, or, the same address
	 * specified twice, the from/two addresses will be the same.
	 */
	if (cmdp->addr1.lno == cmdp->addr2.lno)
		++cmdp->addr2.lno;

	clen = tlen = 0;
        for (first = 1,
	    from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
		/*
		 * Get next line.  Historic versions of vi allowed "10J" while
		 * less than 10 lines from the end-of-file, so we do too.
		 */
		if (db_get(sp, from, 0, &p, &len)) {
			cmdp->addr2.lno = from - 1;
			break;
		}

		/* Empty lines just go away. */
		if (len == 0)
			continue;

		/*
		 * Get more space if necessary.  Note, tlen isn't the length
		 * of the new line, it's roughly the amount of space needed.
		 * tbp - bp is the length of the new line.
		 */
		tlen += len + 2;
		ADD_SPACE_RET(sp, bp, blen, tlen);
		tbp = bp + clen;

		/*
		 * Historic practice:
		 *
		 * If force specified, join without modification.
		 * If the current line ends with whitespace, strip leading
		 *    whitespace from the joined line.
		 * If the next line starts with a ), do nothing.
		 * If the current line ends with ., insert two spaces.
		 * Else, insert one space.
		 *
		 * One change -- add ? and ! to the list of characters for
		 * which we insert two spaces.  I expect that POSIX 1003.2
		 * will require this as well.
		 *
		 * Echar is the last character in the last line joined.
		 */
		extra = 0;
		if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
			if (isblank(echar))
				for (; len && isblank(*p); --len, ++p);
			else if (p[0] != ')') {
				if (strchr(".?!", echar)) {
					*tbp++ = ' ';
					++clen;
					extra = 1;
				}
				*tbp++ = ' ';
				++clen;
				for (; len && isblank(*p); --len, ++p);
			}
		}

		if (len != 0) {
			memcpy(tbp, p, len);
			tbp += len;
			clen += len;
			echar = p[len - 1];
		} else
			echar = ' ';

		/*
		 * Historic practice for vi was to put the cursor at the first
		 * inserted whitespace character, if there was one, or the
		 * first character of the joined line, if there wasn't, or the
		 * last character of the line if joined to an empty line.  If
		 * a count was specified, the cursor was moved as described
		 * for the first line joined, ignoring subsequent lines.  If
		 * the join was a ':' command, the cursor was placed at the
		 * first non-blank character of the line unless the cursor was
		 * "attracted" to the end of line when the command was executed
		 * in which case it moved to the new end of line.  There are
		 * probably several more special cases, but frankly, my dear,
		 * I don't give a damn.  This implementation puts the cursor
		 * on the first inserted whitespace character, the first
		 * character of the joined line, or the last character of the
		 * line regardless.  Note, if the cursor isn't on the joined
		 * line (possible with : commands), it is reset to the starting
		 * line.
		 */
		if (first) {
			sp->cno = (tbp - bp) - (1 + extra);
			first = 0;
		} else
			sp->cno = (tbp - bp) - len - (1 + extra);
	}
	sp->lno = cmdp->addr1.lno;

	/* Delete the joined lines. */
        for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
		if (db_delete(sp, to))
			goto err;

	/* If the original line changed, reset it. */
	if (!first && db_set(sp, from, bp, tbp - bp)) {
err:		FREE_SPACE(sp, bp, blen);
		return (1);
	}
	FREE_SPACE(sp, bp, blen);

	sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
	return (0);
}