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authorThomas Ulmer <thomasmulmer02@gmail.com>2026-03-02 20:03:16 -0800
committerThomas Ulmer <thomasmulmer02@gmail.com>2026-03-02 20:03:16 -0800
commit8b9a895e4425462787aba1b9b0b55495880fe707 (patch)
tree5c6faa3afd20729b86def89762e33606a001f3b8 /src/vi/ex-070224/ex_temp.h
parent8e8d7917d5742c7ce42b46681c7c4430a51da505 (diff)
move vi to separate repo
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-/*
- * This code contains changes by
- * Gunnar Ritter, Freiburg i. Br., Germany, 2002. All rights reserved.
- *
- * Conditions 1, 2, and 4 and the no-warranty notice below apply
- * to these changes.
- *
- *
- * Copyright (c) 1980, 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.
- *
- *
- * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * Redistributions of source code and documentation must retain the
- * above copyright notice, this list of conditions and the following
- * disclaimer.
- * 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.
- * All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed or owned by Caldera
- * International, Inc.
- * Neither the name of Caldera International, Inc. nor the names of
- * other contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
- * INTERNATIONAL, INC. 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 CALDERA INTERNATIONAL, INC. 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.
- *
- * from ex_temp.h 7.4 (Berkeley) 5/31/85
- *
- * Sccsid @(#)ex_temp.h 1.10 (gritter) 8/4/05
- */
-
-/*
- * The editor uses a temporary file for files being edited, in a structure
- * similar to that of ed. The first block of the file is used for a header
- * block which guides recovery after editor/system crashes.
- * Lines are represented in core by a pointer into the temporary file which
- * is packed into 16 bits (32 on VMUNIX). All but the low bit index the temp
- * file; the last is used by global commands. The parameters below control
- * how much the other bits are shifted left before they index the temp file.
- * Larger shifts give more slop in the temp file but allow larger files
- * to be edited.
- *
- * The editor does not garbage collect the temporary file. When a new
- * file is edited, the temporary file is rather discarded and a new one
- * created for the new file. Garbage collection would be rather complicated
- * in ex because of the general undo, and in any case would require more
- * work when throwing lines away because marks would have be carefully
- * checked before reallocating temporary file space. Said another way,
- * each time you create a new line in the temporary file you get a unique
- * number back, and this is a property used by marks.
- *
- * The following temp file parameters allow 256k bytes in the temporary
- * file. By changing to the numbers in comments you can get 512k.
- * For VMUNIX you get more than you could ever want.
- * VMUNIX uses long (32 bit) integers giving much more
- * space in the temp file and no waste. This doubles core
- * requirements but allows files of essentially unlimited size to be edited.
- */
-#ifndef VMUNIX
-#define BLKMSK 0777 /* 01777 */
-#define BNDRY 8 /* 16 */
-#define INCRMT 0200 /* 0100 */
-#define LBTMSK 0770 /* 0760 */
-#define NMBLKS 506 /* 1018 */
-#define OFFBTS 7 /* 6 */
-#define OFFMSK 0177 /* 077 */
-#define SHFT 2 /* 3 */
-#define TLNMSK 077776
-#else /* VMUNIX */
-#ifdef LARGEF
-#define BLKMSK 017777777777
-#else
-#define BLKMSK 077777
-#endif
-#define BNDRY 2
-#define INCRMT 02000
-#define LBTMSK 01776
-#ifdef LARGEF
-#define NMBLKS 017777777770
-#else
-#define NMBLKS 077770
-#endif
-#define OFFBTS 10
-#define OFFMSK 01777
-#define SHFT 0
-#define TLNMSK 017777777776
-#endif /* VMUNIX */
-
-/*
- * The editor uses three buffers into the temporary file (ed uses two
- * and is very similar). These are two read buffers and one write buffer.
- * Basically, the editor deals with the file as a sequence of BUFSIZ character
- * blocks. Each block contains some number of lines (and lines
- * can run across block boundaries.
- *
- * New lines are written into the last block in the temporary file
- * which is in core as obuf. When a line is needed which isn't in obuf,
- * then it is brought into an input buffer. As there are two, the choice
- * is to take the buffer into which the last read (of the two) didn't go.
- * Thus this is a 2 buffer LRU replacement strategy. Measurement
- * shows that this saves roughly 25% of the buffer reads over a one
- * input buffer strategy. Since the editor (on our VAX over 1 week)
- * spends (spent) roughly 30% of its time in the system read routine,
- * this can be a big help.
- */
-var bool hitin2; /* Last read hit was ibuff2 not ibuff */
-var bool ichang2; /* Have actually changed ibuff2 */
-var bool ichanged; /* Have actually changed ibuff */
-var bloc iblock; /* Temp file block number of ibuff (or -1) */
-var bloc iblock2; /* Temp file block number of ibuff2 (or -1) */
-var bloc ninbuf; /* Number useful chars left in input buffer */
-var bloc nleft; /* Number usable chars left in output buffer */
-var bloc oblock; /* Temp file block number of obuff (or -1) */
-var bbloc tline; /* Current temp file ptr */
-
-var char ibuff[BUFSIZ];
-var char ibuff2[BUFSIZ];
-var char obuff[BUFSIZ];
-
-/*
- * Structure of the descriptor block which resides
- * in the first block of the temporary file and is
- * the guiding light for crash recovery.
- *
- * As the Blocks field below implies, there are temporary file blocks
- * devoted to (some) image of the incore array of pointers into the temp
- * file. Thus, to recover from a crash we use these indices to get the
- * line pointers back, and then use the line pointers to get the text back.
- * Except for possible lost lines due to sandbagged I/O, the entire
- * file (at the time of the last editor "sync") can be recovered from
- * the temp file.
- */
-
-/* This definition also appears in expreserve.c... beware */
-struct header {
- time_t Time; /* Time temp file last updated */
- uid_t Uid;
- bbloc Flines; /* Number of lines in file */
- char Savedfile[FNSIZE]; /* The current file name */
- bloc Blocks[LBLKS]; /* Blocks where line pointers stashed */
-};
-var struct header H;
-
-#define uid H.Uid
-#define flines H.Flines
-#define savedfile H.Savedfile
-#define blocks H.Blocks