OpenBSD-4.6/usr.bin/vi/common/cut.c
/* $OpenBSD: cut.c,v 1.10 2006/01/08 21:09:13 miod 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"
#ifndef lint
static const char sccsid[] = "@(#)cut.c 10.10 (Berkeley) 9/15/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
static void cb_rotate(SCR *);
/*
* cut --
* Put a range of lines/columns into a TEXT 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
* unnamed buffer storage. There is a pointer, too, which is the current
* default buffer, i.e. it may point to the unnamed buffer or a named buffer
* depending on into what buffer the last text was cut. Logically, in both
* delete and yank operations, if the user names a buffer, the text is cut
* into it. 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 cut into the buffer named
* '1'. The text is always cut into the unnamed buffer.
*
* 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. Note, however, that if text is appended to a buffer, the
* default buffer only contains the appended text, not the entire contents
* of the buffer.
*
* !!!
* 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.
*
* PUBLIC: int cut(SCR *, CHAR_T *, MARK *, MARK *, int);
*/
int
cut(sp, namep, fm, tm, flags)
SCR *sp;
CHAR_T *namep;
MARK *fm, *tm;
int flags;
{
CB *cbp;
CHAR_T name = '1'; /* default numeric buffer */
recno_t lno;
int append, copy_one, copy_def;
/*
* If the user specified a buffer, put it there. (This may require
* a copy into the numeric buffers. We do the copy so that we don't
* have to reference count and so we don't have to deal with things
* like appends to buffers that are used multiple times.)
*
* Otherwise, if it's supposed to be put in a numeric buffer (usually
* a delete) put it there. The rules for putting things in numeric
* buffers were historically a little strange. There were three cases.
*
* 1: Some motions are always line mode motions, which means
* that the cut always goes into the numeric buffers.
* 2: Some motions aren't line mode motions, e.g. d10w, but
* can cross line boundaries. For these commands, if the
* cut crosses a line boundary, it goes into the numeric
* buffers. This includes most of the commands.
* 3: Some motions aren't line mode motions, e.g. d`<char>,
* but always go into the numeric buffers, regardless. This
* was the commands: % ` / ? ( ) N n { } -- and nvi adds ^A.
*
* Otherwise, put it in the unnamed buffer.
*/
append = copy_one = copy_def = 0;
if (namep != NULL) {
name = *namep;
if (LF_ISSET(CUT_NUMREQ) || (LF_ISSET(CUT_NUMOPT) &&
(LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno))) {
copy_one = 1;
cb_rotate(sp);
}
if ((append = isupper(name)) == 1) {
if (!copy_one)
copy_def = 1;
name = tolower(name);
}
namecb: CBNAME(sp, cbp, name);
} else if (LF_ISSET(CUT_NUMREQ) || (LF_ISSET(CUT_NUMOPT) &&
(LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno))) {
/* Copy into numeric buffer 1. */
cb_rotate(sp);
goto namecb;
} else
cbp = &sp->gp->dcb_store;
copyloop:
/*
* 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_RET(sp, cbp, CB *, 1, sizeof(CB));
cbp->name = name;
CIRCLEQ_INIT(&cbp->textq);
LIST_INSERT_HEAD(&sp->gp->cutq, cbp, q);
} 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)) {
cbp->flags |= CB_LMODE;
for (lno = fm->lno; lno <= tm->lno; ++lno)
if (cut_line(sp, lno, 0, CUT_LINE_TO_EOL, cbp))
goto cut_line_err;
} else {
/*
* Get the first line. A length of CUT_LINE_TO_EOL causes
* cut_line() to cut from the MARK to the end of the line.
*/
if (cut_line(sp, fm->lno, fm->cno, fm->lno != tm->lno ?
CUT_LINE_TO_EOL : (tm->cno - fm->cno) + 1, cbp))
goto cut_line_err;
/* Get the intermediate lines. */
for (lno = fm->lno; ++lno < tm->lno;)
if (cut_line(sp, lno, 0, CUT_LINE_TO_EOL, cbp))
goto cut_line_err;
/* Get the last line. */
if (tm->lno != fm->lno &&
cut_line(sp, lno, 0, tm->cno + 1, cbp))
goto cut_line_err;
}
append = 0; /* Only append to the named buffer. */
sp->gp->dcbp = cbp; /* Repoint the default buffer on each pass. */
if (copy_one) { /* Copy into numeric buffer 1. */
CBNAME(sp, cbp, name);
copy_one = 0;
goto copyloop;
}
if (copy_def) { /* Copy into the default buffer. */
cbp = &sp->gp->dcb_store;
copy_def = 0;
goto copyloop;
}
return (0);
cut_line_err:
text_lfree(&cbp->textq);
cbp->len = 0;
cbp->flags = 0;
return (1);
}
/*
* cb_rotate --
* Rotate the numbered buffers up one.
*/
static void
cb_rotate(sp)
SCR *sp;
{
CB *cbp, *del_cbp;
del_cbp = NULL;
LIST_FOREACH(cbp, &sp->gp->cutq, q)
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);
}
}
/*
* cut_line --
* Cut a portion of a single line.
*
* PUBLIC: int cut_line(SCR *, recno_t, size_t, size_t, CB *);
*/
int
cut_line(sp, lno, fcno, clen, cbp)
SCR *sp;
recno_t lno;
size_t fcno, clen;
CB *cbp;
{
TEXT *tp;
size_t len;
char *p;
/* Get the line. */
if (db_get(sp, lno, DBG_FATAL, &p, &len))
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 == CUT_LINE_TO_EOL)
clen = len - fcno;
memcpy(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);
}
/*
* cut_close --
* Discard all cut buffers.
*
* PUBLIC: void cut_close(GS *);
*/
void
cut_close(gp)
GS *gp;
{
CB *cbp;
/* Free cut buffer list. */
while ((cbp = LIST_FIRST(&gp->cutq)) != NULL) {
if (CIRCLEQ_FIRST(&cbp->textq) != CIRCLEQ_END(&cbp->textq))
text_lfree(&cbp->textq);
LIST_REMOVE(cbp, q);
free(cbp);
}
/* Free default cut storage. */
cbp = &gp->dcb_store;
if (CIRCLEQ_FIRST(&cbp->textq) != CIRCLEQ_END(&cbp->textq))
text_lfree(&cbp->textq);
}
/*
* text_init --
* Allocate a new TEXT structure.
*
* PUBLIC: TEXT *text_init(SCR *, const char *, size_t, size_t);
*/
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(3) 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)
memcpy(tp->lb, p, len);
}
tp->len = len;
return (tp);
}
/*
* text_lfree --
* Free a chain of text structures.
*
* PUBLIC: void text_lfree(TEXTH *);
*/
void
text_lfree(headp)
TEXTH *headp;
{
TEXT *tp;
while ((tp = CIRCLEQ_FIRST(headp)) != CIRCLEQ_END(headp)) {
CIRCLEQ_REMOVE(headp, tp, q);
text_free(tp);
}
}
/*
* text_free --
* Free a text structure.
*
* PUBLIC: void text_free(TEXT *);
*/
void
text_free(tp)
TEXT *tp;
{
if (tp->lb != NULL)
free(tp->lb);
free(tp);
}