NetBSD/usr.bin/vi/cut.c

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/*-
* Copyright (c) 1992, 1993, 1994
* 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[] = "@(#)cut.c 8.26 (Berkeley) 3/14/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
static int cb_line __P((SCR *, EXF *, recno_t, size_t, size_t, CB *));
static int cb_rotate __P((SCR *));
/*
* cut --
* Put a range of lines/columns into a buffer.
*
* There are two buffer areas, both found in the global structure. The first
* is the linked list of all the buffers the user has named, the second is the
* default buffer storage. There is a pointer, too, which is the current
* default buffer, i.e. it may point to the default buffer or a named buffer
* depending on into what buffer the last text was cut. In both delete and
* yank operations, text is cut into either the buffer named by the user or
* the default buffer. If it's a delete of information on more than a single
* line, the contents of the numbered buffers are rotated up one, the contents
* of the buffer named '9' are discarded, and the text is also cut into the
* buffer named '1'.
*
* In all cases, upper-case buffer names are the same as lower-case names,
* with the exception that they cause the buffer to be appended to instead
* of replaced.
*
* !!!
* The contents of the default buffer would disappear after most operations
* in historic vi. It's unclear that this is useful, so we don't bother.
*
* When users explicitly cut text into the numeric buffers, historic vi became
* genuinely strange. I've never been able to figure out what was supposed to
* happen. It behaved differently if you deleted text than if you yanked text,
* and, in the latter case, the text was appended to the buffer instead of
* replacing the contents. Hopefully it's not worth getting right, and here
* we just treat the numeric buffers like any other named buffer.
*/
int
cut(sp, ep, cbp, namep, fm, tm, flags)
SCR *sp;
EXF *ep;
CB *cbp;
CHAR_T *namep;
int flags;
MARK *fm, *tm;
{
CHAR_T name;
recno_t lno;
int append, namedbuffer, setdefcb;
if (cbp == NULL) {
if (namep == NULL) {
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if (LF_ISSET(CUT_DELETE) &&
(LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) {
(void)cb_rotate(sp);
name = '1';
goto defcb;
}
cbp = sp->gp->dcb_store;
append = namedbuffer = 0;
} else {
name = *namep;
defcb: CBNAME(sp, cbp, name);
append = isupper(name);
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namedbuffer = 1;
}
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setdefcb = 1;
} else
append = namedbuffer = setdefcb = 0;
/*
* If this is a new buffer, create it and add it into the list.
* Otherwise, if it's not an append, free its current contents.
*/
if (cbp == NULL) {
CALLOC(sp, cbp, CB *, 1, sizeof(CB));
cbp->name = name;
CIRCLEQ_INIT(&cbp->textq);
if (namedbuffer) {
LIST_INSERT_HEAD(&sp->gp->cutq, cbp, q);
} else
sp->gp->dcb_store = cbp;
} else if (!append) {
text_lfree(&cbp->textq);
cbp->len = 0;
cbp->flags = 0;
}
#define ENTIRE_LINE 0
/* In line mode, it's pretty easy, just cut the lines. */
if (LF_ISSET(CUT_LINEMODE)) {
cbp->flags |= CB_LMODE;
for (lno = fm->lno; lno <= tm->lno; ++lno)
if (cb_line(sp, ep, lno, 0, 0, cbp))
goto cb_line_fail;
} else {
/*
* Get the first line. A length of 0 causes cb_line
* to cut from the MARK to the end of the line.
*/
if (cb_line(sp, ep, fm->lno, fm->cno,
fm->lno != tm->lno ? ENTIRE_LINE : (tm->cno - fm->cno) + 1,
cbp))
goto cb_line_fail;
/* Get the intermediate lines. */
for (lno = fm->lno; ++lno < tm->lno;)
if (cb_line(sp, ep, lno, 0, ENTIRE_LINE, cbp))
goto cb_line_fail;
/* Get the last line. */
if (tm->lno != fm->lno &&
cb_line(sp, ep, lno, 0, tm->cno + 1, cbp)) {
cb_line_fail: text_lfree(&cbp->textq);
cbp->len = 0;
cbp->flags = 0;
return (1);
}
}
if (setdefcb)
sp->gp->dcbp = cbp; /* Repoint default buffer. */
return (0);
}
/*
* cb_rotate --
* Rotate the numbered buffers up one.
*/
static int
cb_rotate(sp)
SCR *sp;
{
CB *cbp, *del_cbp;
del_cbp = NULL;
for (cbp = sp->gp->cutq.lh_first; cbp != NULL; cbp = cbp->q.le_next)
switch(cbp->name) {
case '1':
cbp->name = '2';
break;
case '2':
cbp->name = '3';
break;
case '3':
cbp->name = '4';
break;
case '4':
cbp->name = '5';
break;
case '5':
cbp->name = '6';
break;
case '6':
cbp->name = '7';
break;
case '7':
cbp->name = '8';
break;
case '8':
cbp->name = '9';
break;
case '9':
del_cbp = cbp;
break;
}
if (del_cbp != NULL) {
LIST_REMOVE(del_cbp, q);
text_lfree(&del_cbp->textq);
FREE(del_cbp, sizeof(CB));
}
return (0);
}
/*
* cb_line --
* Cut a portion of a single line.
*/
static int
cb_line(sp, ep, lno, fcno, clen, cbp)
SCR *sp;
EXF *ep;
recno_t lno;
size_t fcno, clen;
CB *cbp;
{
TEXT *tp;
size_t len;
char *p;
/* Get the line. */
if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
GETLINE_ERR(sp, lno);
return (1);
}
/* Create a TEXT structure that can hold the entire line. */
if ((tp = text_init(sp, NULL, 0, len)) == NULL)
return (1);
/*
* If the line isn't empty and it's not the entire line,
* copy the portion we want, and reset the TEXT length.
*/
if (len != 0) {
if (clen == 0)
clen = len - fcno;
memmove(tp->lb, p + fcno, clen);
tp->len = clen;
}
/* Append to the end of the cut buffer. */
CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q);
cbp->len += tp->len;
return (0);
}
/*
* text_init --
* Allocate a new TEXT structure.
*/
TEXT *
text_init(sp, p, len, total_len)
SCR *sp;
const char *p;
size_t len, total_len;
{
TEXT *tp;
CALLOC(sp, tp, TEXT *, 1, sizeof(TEXT));
if (tp == NULL)
return (NULL);
/* ANSI C doesn't define a call to malloc(2) for 0 bytes. */
if ((tp->lb_len = total_len) != 0) {
MALLOC(sp, tp->lb, CHAR_T *, tp->lb_len);
if (tp->lb == NULL) {
free(tp);
return (NULL);
}
if (p != NULL && len != 0)
memmove(tp->lb, p, len);
}
tp->len = len;
return (tp);
}
/*
* text_lfree --
* Free a chain of text structures.
*/
void
text_lfree(headp)
TEXTH *headp;
{
TEXT *tp;
while ((tp = headp->cqh_first) != (void *)headp) {
CIRCLEQ_REMOVE(headp, tp, q);
text_free(tp);
}
}
/*
* text_free --
* Free a text structure.
*/
void
text_free(tp)
TEXT *tp;
{
if (tp->lb != NULL)
FREE(tp->lb, tp->lb_len);
if (tp->wd != NULL)
FREE(tp->wd, tp->wd_len);
FREE(tp, sizeof(TEXT));
}