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/* $OpenBSD: ex_join.c,v 1.8 2016/01/06 22:28:52 millert 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(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, "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);
}
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