352 lines
8.5 KiB
C
352 lines
8.5 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "$Id: cut.c,v 10.12 2012/02/11 15:52:33 zy Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <bitstring.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "common.h"
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static void cb_rotate(SCR *);
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/*
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* cut --
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* Put a range of lines/columns into a TEXT buffer.
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*
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* There are two buffer areas, both found in the global structure. The first
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* is the linked list of all the buffers the user has named, the second is the
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* unnamed buffer storage. There is a pointer, too, which is the current
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* default buffer, i.e. it may point to the unnamed buffer or a named buffer
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* depending on into what buffer the last text was cut. Logically, in both
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* delete and yank operations, if the user names a buffer, the text is cut
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* into it. If it's a delete of information on more than a single line, the
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* contents of the numbered buffers are rotated up one, the contents of the
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* buffer named '9' are discarded, and the text is cut into the buffer named
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* '1'. The text is always cut into the unnamed buffer.
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*
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* In all cases, upper-case buffer names are the same as lower-case names,
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* with the exception that they cause the buffer to be appended to instead
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* of replaced. Note, however, that if text is appended to a buffer, the
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* default buffer only contains the appended text, not the entire contents
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* of the buffer.
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*
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* !!!
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* The contents of the default buffer would disappear after most operations
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* in historic vi. It's unclear that this is useful, so we don't bother.
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*
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* When users explicitly cut text into the numeric buffers, historic vi became
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* genuinely strange. I've never been able to figure out what was supposed to
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* happen. It behaved differently if you deleted text than if you yanked text,
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* and, in the latter case, the text was appended to the buffer instead of
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* replacing the contents. Hopefully it's not worth getting right, and here
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* we just treat the numeric buffers like any other named buffer.
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*
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* PUBLIC: int cut(SCR *, CHAR_T *, MARK *, MARK *, int);
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*/
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int
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cut(
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SCR *sp,
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CHAR_T *namep,
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MARK *fm,
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MARK *tm,
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int flags)
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{
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CB *cbp;
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CHAR_T name = '\0';
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recno_t lno;
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int append, copy_one, copy_def;
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/*
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* If the user specified a buffer, put it there. (This may require
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* a copy into the numeric buffers. We do the copy so that we don't
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* have to reference count and so we don't have to deal with things
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* like appends to buffers that are used multiple times.)
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*
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* Otherwise, if it's supposed to be put in a numeric buffer (usually
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* a delete) put it there. The rules for putting things in numeric
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* buffers were historically a little strange. There were three cases.
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*
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* 1: Some motions are always line mode motions, which means
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* that the cut always goes into the numeric buffers.
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* 2: Some motions aren't line mode motions, e.g. d10w, but
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* can cross line boundaries. For these commands, if the
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* cut crosses a line boundary, it goes into the numeric
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* buffers. This includes most of the commands.
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* 3: Some motions aren't line mode motions, e.g. d`<char>,
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* but always go into the numeric buffers, regardless. This
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* was the commands: % ` / ? ( ) N n { } -- and nvi adds ^A.
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*
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* Otherwise, put it in the unnamed buffer.
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*/
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append = copy_one = copy_def = 0;
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if (namep != NULL) {
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name = *namep;
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if (LF_ISSET(CUT_NUMREQ) || (LF_ISSET(CUT_NUMOPT) &&
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(LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno))) {
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copy_one = 1;
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cb_rotate(sp);
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}
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if ((append = isupper(name))) {
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if (!copy_one)
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copy_def = 1;
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name = tolower(name);
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}
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namecb: CBNAME(sp, cbp, name);
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} else if (LF_ISSET(CUT_NUMREQ) || (LF_ISSET(CUT_NUMOPT) &&
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(LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno))) {
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name = '1';
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cb_rotate(sp);
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goto namecb;
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} else
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cbp = &sp->gp->dcb_store;
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copyloop:
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/*
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* If this is a new buffer, create it and add it into the list.
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* Otherwise, if it's not an append, free its current contents.
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*/
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if (cbp == NULL) {
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CALLOC_RET(sp, cbp, CB *, 1, sizeof(CB));
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cbp->name = name;
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TAILQ_INIT(cbp->textq);
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SLIST_INSERT_HEAD(sp->gp->cutq, cbp, q);
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} else if (!append) {
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text_lfree(cbp->textq);
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cbp->len = 0;
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cbp->flags = 0;
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}
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/* In line mode, it's pretty easy, just cut the lines. */
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if (LF_ISSET(CUT_LINEMODE)) {
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cbp->flags |= CB_LMODE;
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for (lno = fm->lno; lno <= tm->lno; ++lno)
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if (cut_line(sp, lno, 0, ENTIRE_LINE, cbp))
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goto cut_line_err;
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} else {
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/*
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* Get the first line. A length of ENTIRE_LINE causes
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* cut_line to cut from the MARK to the end of the line.
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*/
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if (cut_line(sp, fm->lno, fm->cno, fm->lno != tm->lno ?
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ENTIRE_LINE : (tm->cno - fm->cno) + 1, cbp))
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goto cut_line_err;
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/* Get the intermediate lines. */
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for (lno = fm->lno; ++lno < tm->lno;)
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if (cut_line(sp, lno, 0, ENTIRE_LINE, cbp))
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goto cut_line_err;
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/* Get the last line. */
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if (tm->lno != fm->lno &&
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cut_line(sp, lno, 0, tm->cno + 1, cbp))
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goto cut_line_err;
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}
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append = 0; /* Only append to the named buffer. */
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sp->gp->dcbp = cbp; /* Repoint the default buffer on each pass. */
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if (copy_one) { /* Copy into numeric buffer 1. */
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name = '1';
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CBNAME(sp, cbp, name);
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copy_one = 0;
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goto copyloop;
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}
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if (copy_def) { /* Copy into the default buffer. */
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cbp = &sp->gp->dcb_store;
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copy_def = 0;
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goto copyloop;
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}
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return (0);
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cut_line_err:
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text_lfree(cbp->textq);
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cbp->len = 0;
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cbp->flags = 0;
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return (1);
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}
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/*
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* cb_rotate --
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* Rotate the numbered buffers up one.
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*/
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static void
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cb_rotate(SCR *sp)
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{
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CB *cbp, *del_cbp = NULL, *pre_cbp = NULL;
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SLIST_FOREACH(cbp, sp->gp->cutq, q) {
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switch(cbp->name) {
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case '1': case '2': case '3':
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case '4': case '5': case '6':
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case '7': case '8':
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cbp->name += 1;
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break;
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case '9':
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if (cbp == SLIST_FIRST(sp->gp->cutq))
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SLIST_REMOVE_HEAD(sp->gp->cutq, q);
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else
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SLIST_REMOVE_AFTER(pre_cbp, q);
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del_cbp = cbp;
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break;
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}
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pre_cbp = cbp;
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}
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if (del_cbp != NULL) {
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text_lfree(del_cbp->textq);
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free(del_cbp);
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}
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}
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/*
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* cut_line --
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* Cut a portion of a single line.
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*
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* PUBLIC: int cut_line(SCR *, recno_t, size_t, size_t, CB *);
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*/
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int
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cut_line(
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SCR *sp,
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recno_t lno,
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size_t fcno,
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size_t clen,
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CB *cbp)
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{
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TEXT *tp;
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size_t len;
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CHAR_T *p;
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/* Get the line. */
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if (db_get(sp, lno, DBG_FATAL, &p, &len))
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return (1);
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/* Create a TEXT structure that can hold the entire line. */
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if ((tp = text_init(sp, NULL, 0, len)) == NULL)
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return (1);
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/*
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* If the line isn't empty and it's not the entire line,
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* copy the portion we want, and reset the TEXT length.
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*/
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if (len != 0) {
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if (clen == ENTIRE_LINE)
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clen = len - fcno;
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MEMCPY(tp->lb, p + fcno, clen);
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tp->len = clen;
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}
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/* Append to the end of the cut buffer. */
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TAILQ_INSERT_TAIL(cbp->textq, tp, q);
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cbp->len += tp->len;
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return (0);
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}
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/*
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* cut_close --
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* Discard all cut buffers.
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*
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* PUBLIC: void cut_close(GS *);
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*/
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void
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cut_close(GS *gp)
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{
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CB *cbp;
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/* Free cut buffer list. */
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while ((cbp = SLIST_FIRST(gp->cutq)) != NULL) {
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if (!TAILQ_EMPTY(cbp->textq))
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text_lfree(cbp->textq);
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SLIST_REMOVE_HEAD(gp->cutq, q);
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free(cbp);
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}
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/* Free default cut storage. */
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cbp = &gp->dcb_store;
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if (!TAILQ_EMPTY(cbp->textq))
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text_lfree(cbp->textq);
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}
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/*
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* text_init --
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* Allocate a new TEXT structure.
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*
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* PUBLIC: TEXT *text_init(SCR *, const CHAR_T *, size_t, size_t);
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*/
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TEXT *
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text_init(
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SCR *sp,
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const CHAR_T *p,
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size_t len,
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size_t total_len)
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{
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TEXT *tp;
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CALLOC(sp, tp, TEXT *, 1, sizeof(TEXT));
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if (tp == NULL)
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return (NULL);
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/* ANSI C doesn't define a call to malloc(3) for 0 bytes. */
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if ((tp->lb_len = total_len * sizeof(CHAR_T)) != 0) {
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MALLOC(sp, tp->lb, CHAR_T *, tp->lb_len);
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if (tp->lb == NULL) {
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free(tp);
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return (NULL);
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}
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if (p != NULL && len != 0)
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MEMCPY(tp->lb, p, len);
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}
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tp->len = len;
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return (tp);
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}
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/*
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* text_lfree --
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* Free a chain of text structures.
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*
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* PUBLIC: void text_lfree(TEXTH *);
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*/
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void
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text_lfree(TEXTH *headp)
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{
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TEXT *tp;
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while ((tp = TAILQ_FIRST(headp)) != NULL) {
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TAILQ_REMOVE(headp, tp, q);
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text_free(tp);
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}
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}
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/*
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* text_free --
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* Free a text structure.
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*
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* PUBLIC: void text_free(TEXT *);
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*/
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void
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text_free(TEXT *tp)
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{
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if (tp->lb != NULL)
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free(tp->lb);
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free(tp);
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}
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