NetBSD/usr.bin/vi/cut.c

528 lines
13 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[] = "@(#)cut.c 8.20 (Berkeley) 1/23/94"; */
static char *rcsid = "$Id: cut.c,v 1.2 1994/01/24 06:38:47 cgd Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "vi.h"
static int cb_line __P((SCR *, EXF *, recno_t, size_t, size_t, TEXT **));
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.
*/
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;
TEXT *tp;
recno_t lno;
size_t len;
int append, namedbuffer, setdefcb;
#if defined(DEBUG) && 0
TRACE(sp, "cut: from {%lu, %d}, to {%lu, %d}%s\n",
fm->lno, fm->cno, tm->lno, tm->cno,
LF_ISSET(CUT_LINEMODE) ? " LINE MODE" : "");
#endif
if (cbp == NULL) {
if (LF_ISSET(CUT_DELETE) &&
(LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) {
(void)cb_rotate(sp);
name = '1';
goto defcb;
}
if (namep == NULL) {
cbp = sp->gp->dcb_store;
append = namedbuffer = 0;
setdefcb = 1;
} else {
name = *namep;
defcb: CBNAME(sp, cbp, name);
append = isupper(name);
namedbuffer = 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;
}
/* In line mode, it's pretty easy, just cut the lines. */
if (LF_ISSET(CUT_LINEMODE)) {
for (lno = fm->lno; lno <= tm->lno; ++lno) {
if (cb_line(sp, ep, lno, 0, 0, &tp))
goto mem;
CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q);
cbp->len += tp->len;
}
cbp->flags |= CB_LMODE;
} else {
/* Get the first line. */
len = fm->lno < tm->lno ? 0 : tm->cno - fm->cno;
if (cb_line(sp, ep, fm->lno, fm->cno, len, &tp))
goto mem;
CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q);
cbp->len += tp->len;
/* Get the intermediate lines. */
for (lno = fm->lno; ++lno < tm->lno;) {
if (cb_line(sp, ep, lno, 0, 0, &tp))
goto mem;
CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q);
cbp->len += tp->len;
}
/* Get the last line. */
if (tm->lno > fm->lno && tm->cno > 0) {
if (cb_line(sp, ep, lno, 0, tm->cno, &tp)) {
mem: if (append)
msgq(sp, M_ERR,
"Contents of %s buffer lost.",
charname(sp, name));
text_lfree(&cbp->textq);
cbp->len = 0;
cbp->flags = 0;
return (1);
}
CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q);
cbp->len += tp->len;
}
}
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, newp)
SCR *sp;
EXF *ep;
recno_t lno;
size_t fcno, clen;
TEXT **newp;
{
TEXT *tp;
size_t len;
char *p;
if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
GETLINE_ERR(sp, lno);
return (1);
}
if ((*newp = tp = text_init(sp, NULL, 0, len)) == NULL)
return (1);
/*
* A length of zero means to cut from the MARK to the end
* of the line.
*/
if (len != 0) {
if (clen == 0)
clen = len - fcno;
memmove(tp->lb, p + fcno, clen);
tp->len = clen;
}
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;
MALLOC(sp, tp, TEXT *, 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) {
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);
} else
tp->lb = NULL;
tp->len = len;
tp->ai = tp->insert = tp->offset = tp->owrite = 0;
tp->wd = NULL;
tp->wd_len = 0;
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));
}
/*
* put --
* Put text buffer contents into the file.
*
* !!!
* Historically, pasting into a file with no lines in vi would preserve
* the single blank line. This is almost certainly a result of the fact
* that 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.
*/
int
put(sp, ep, cbp, namep, cp, rp, append)
SCR *sp;
EXF *ep;
CB *cbp;
CHAR_T *namep;
MARK *cp, *rp;
int append;
{
CHAR_T name;
TEXT *ltp, *tp;
recno_t lno;
size_t blen, clen, len;
char *bp, *p, *t;
if (cbp == NULL)
if (namep == NULL) {
cbp = sp->gp->dcbp;
if (cbp == NULL) {
msgq(sp, M_ERR, "The default buffer is empty.");
return (1);
}
} else {
name = *namep;
CBNAME(sp, cbp, name);
if (cbp == NULL) {
msgq(sp, M_ERR,
"Buffer %s is empty.", charname(sp, name));
return (1);
}
}
tp = cbp->textq.cqh_first;
/*
* 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.
*
* Historical practice is that the cursor ends up on the first
* non-blank character of the first line inserted.
*/
if (cp->lno == 1) {
if (file_lline(sp, ep, &lno))
return (1);
if (lno == 0) {
for (; tp != (void *)&cbp->textq;
++lno, tp = tp->q.cqe_next)
if (file_aline(sp, ep, 1, lno, tp->lb, tp->len))
return (1);
rp->lno = 1;
rp->cno = 0;
(void)nonblank(sp, ep, rp->lno, &rp->cno);
goto ret;
}
}
/* 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 != (void *)&cbp->textq; ++lno, tp = tp->q.cqe_next)
if (file_aline(sp, ep, 1, lno, tp->lb, tp->len))
return (1);
rp->cno = 0;
(void)nonblank(sp, ep, rp->lno, &rp->cno);
goto ret;
}
/*
* 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 ((p = file_gline(sp, ep, lno, &len)) == NULL) {
GETLINE_ERR(sp, lno);
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) {
memmove(bp, p, clen);
p += clen;
t += clen;
}
/* First line from the CB. */
memmove(t, tp->lb, tp->len);
t += tp->len;
/* Calculate length left in original line. */
clen = len ? len - cp->cno - (append ? 1 : 0) : 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 (tp->q.cqe_next == (void *)&cbp->textq) {
/*
* Historical practice is that if a non-line mode put
* is inside a single line, the cursor ends up on the
* last character inserted.
*/
rp->lno = lno;
rp->cno = (t - bp) - 1;
if (clen > 0) {
memmove(t, p, clen);
t += clen;
}
if (file_sline(sp, ep, lno, bp, t - bp))
goto mem;
} 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 = cbp->textq.cqh_last;
len = t - bp;
ADD_SPACE_RET(sp, bp, blen, ltp->len + clen);
t = bp + len;
/* Add in last part of the CB. */
memmove(t, ltp->lb, ltp->len);
if (clen)
memmove(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 (file_sline(sp, ep, lno, bp, t - bp))
goto mem;
/*
* Historical practice is that if a non-line mode put
* covers multiple lines, the cursor ends up on the
* first character inserted. (Of course.)
*/
rp->lno = lno;
rp->cno = (t - bp) - 1;
/* Output any intermediate lines in the CB. */
for (tp = tp->q.cqe_next;
tp->q.cqe_next != (void *)&cbp->textq;
++lno, tp = tp->q.cqe_next)
if (file_aline(sp, ep, 1, lno, tp->lb, tp->len))
goto mem;
if (file_aline(sp, ep, 1, lno, t, clen)) {
mem: FREE_SPACE(sp, bp, blen);
return (1);
}
}
FREE_SPACE(sp, bp, blen);
/* Reporting... */
ret: sp->rptlines[L_PUT] += lno - cp->lno;
return (0);
}