NetBSD/usr.bin/vi/ex/ex_join.c

191 lines
5.9 KiB
C

/*-
* Copyright (c) 1992, 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
/* from: static char sccsid[] = "@(#)ex_join.c 8.8 (Berkeley) 12/29/93"; */
static char *rcsid = "$Id: ex_join.c,v 1.2 1994/01/24 06:40:22 cgd Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "vi.h"
#include "excmd.h"
/*
* ex_join -- :[line [,line]] j[oin][!] [count] [flags]
* Join lines.
*/
int
ex_join(sp, ep, cmdp)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
{
recno_t from, to;
size_t blen, clen, len, tlen;
int echar, extra, first;
char *bp, *p, *tbp;
from = cmdp->addr1.lno;
to = cmdp->addr2.lno;
/* Check for no lines to join. */
if ((p = file_gline(sp, ep, from + 1, &len)) == NULL) {
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 (F_ISSET(cmdp, E_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 ((p = file_gline(sp, ep, from, &len)) == NULL) {
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 ., ? or !, insert two spaces.
* Else, insert one space.
*
* Echar is the last character in the last line joined.
*/
extra = 0;
if (!first && !F_ISSET(cmdp, E_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) {
memmove(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 (file_dline(sp, ep, to))
goto err;
/* Reset the original line. */
if (file_sline(sp, ep, 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);
}