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Gunnar Ritter
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ex_temp.h
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191
ex_temp.h
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/*
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* This code contains changes by
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* Gunnar Ritter, Freiburg i. Br., Germany, 2002. All rights reserved.
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*
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* Conditions 1, 2, and 4 and the no-warranty notice below apply
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* to these changes.
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*
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*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* Redistributions of source code and documentation must retain the
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* above copyright notice, this list of conditions and the following
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* disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed or owned by Caldera
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* International, Inc.
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* Neither the name of Caldera International, Inc. nor the names of
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* other contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
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* INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE
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* LIABLE FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from ex_temp.h 7.4 (Berkeley) 5/31/85
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*
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* @(#)ex_temp.h 1.8 (gritter) 1/26/02
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*/
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/*
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* The editor uses a temporary file for files being edited, in a structure
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* similar to that of ed. The first block of the file is used for a header
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* block which guides recovery after editor/system crashes.
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* Lines are represented in core by a pointer into the temporary file which
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* is packed into 16 bits (32 on VMUNIX). All but the low bit index the temp
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* file; the last is used by global commands. The parameters below control
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* how much the other bits are shifted left before they index the temp file.
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* Larger shifts give more slop in the temp file but allow larger files
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* to be edited.
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*
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* The editor does not garbage collect the temporary file. When a new
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* file is edited, the temporary file is rather discarded and a new one
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* created for the new file. Garbage collection would be rather complicated
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* in ex because of the general undo, and in any case would require more
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* work when throwing lines away because marks would have be carefully
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* checked before reallocating temporary file space. Said another way,
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* each time you create a new line in the temporary file you get a unique
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* number back, and this is a property used by marks.
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*
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* The following temp file parameters allow 256k bytes in the temporary
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* file. By changing to the numbers in comments you can get 512k.
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* For VMUNIX you get more than you could ever want.
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* VMUNIX uses long (32 bit) integers giving much more
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* space in the temp file and no waste. This doubles core
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* requirements but allows files of essentially unlimited size to be edited.
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*/
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#ifndef VMUNIX
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#define BLKMSK 0777 /* 01777 */
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#define BNDRY 8 /* 16 */
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#define INCRMT 0200 /* 0100 */
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#define LBTMSK 0770 /* 0760 */
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#define NMBLKS 506 /* 1018 */
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#define OFFBTS 7 /* 6 */
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#define OFFMSK 0177 /* 077 */
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#define SHFT 2 /* 3 */
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#else
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#ifdef LARGEF
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#define BLKMSK 017777777777
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#else
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#define BLKMSK 077777
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#endif
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#define BNDRY 2
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#define INCRMT 02000
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#define LBTMSK 01776
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#ifdef LARGEF
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#define NMBLKS 017777777770
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#else
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#define NMBLKS 077770
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#endif
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#define OFFBTS 10
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#define OFFMSK 01777
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#define SHFT 0
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#endif
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/*
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* The editor uses three buffers into the temporary file (ed uses two
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* and is very similar). These are two read buffers and one write buffer.
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* Basically, the editor deals with the file as a sequence of BUFSIZ character
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* blocks. Each block contains some number of lines (and lines
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* can run across block boundaries.
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*
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* New lines are written into the last block in the temporary file
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* which is in core as obuf. When a line is needed which isn't in obuf,
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* then it is brought into an input buffer. As there are two, the choice
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* is to take the buffer into which the last read (of the two) didn't go.
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* Thus this is a 2 buffer LRU replacement strategy. Measurement
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* shows that this saves roughly 25% of the buffer reads over a one
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* input buffer strategy. Since the editor (on our VAX over 1 week)
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* spends (spent) roughly 30% of its time in the system read routine,
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* this can be a big help.
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*/
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var bool hitin2; /* Last read hit was ibuff2 not ibuff */
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var bool ichang2; /* Have actually changed ibuff2 */
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var bool ichanged; /* Have actually changed ibuff */
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var bloc iblock; /* Temp file block number of ibuff (or -1) */
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var bloc iblock2; /* Temp file block number of ibuff2 (or -1) */
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var bloc ninbuf; /* Number useful chars left in input buffer */
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var bloc nleft; /* Number usable chars left in output buffer */
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var bloc oblock; /* Temp file block number of obuff (or -1) */
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var bbloc tline; /* Current temp file ptr */
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var char ibuff[BUFSIZ];
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var char ibuff2[BUFSIZ];
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var char obuff[BUFSIZ];
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/*
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* Structure of the descriptor block which resides
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* in the first block of the temporary file and is
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* the guiding light for crash recovery.
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*
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* As the Blocks field below implies, there are temporary file blocks
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* devoted to (some) image of the incore array of pointers into the temp
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* file. Thus, to recover from a crash we use these indices to get the
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* line pointers back, and then use the line pointers to get the text back.
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* Except for possible lost lines due to sandbagged I/O, the entire
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* file (at the time of the last editor "sync") can be recovered from
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* the temp file.
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*/
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/* This definition also appears in expreserve.c... beware */
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struct header {
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time_t Time; /* Time temp file last updated */
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uid_t Uid;
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bbloc Flines; /* Number of lines in file */
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char Savedfile[FNSIZE]; /* The current file name */
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bloc Blocks[LBLKS]; /* Blocks where line pointers stashed */
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};
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var struct header H;
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#define uid H.Uid
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#define flines H.Flines
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#define savedfile H.Savedfile
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#define blocks H.Blocks
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