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- ----------------------------------------------------------------------
- | Citadel |
- | 241 East Eleventh Street * Brookville, IN 47012 * 317-647-4720 |
- | BBS 317-647-2403 |
- ----------------------------------------------------------------------
-
- blkio is distributed in a single compressed file blkioRL.zip; R and L
- would be the release and level numbers, respectively. The ZIP data
- compression utilities are needed to extract the individual files.
-
- The following files are obtained by decompressing blkioRL.zip:
-
- blkio.rme preliminary information
- license.txt license
- rlsnotes.txt release notes
- ansi.h ANSI compatibility header
- makefile UNIX makefile
- install.bat DOS installation batch file
- blkio.rsp Response file for building Borland C library.
- *.h blkio header source files
- *.c blkio C source files
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- Citadel 91/09/23
- ----------------------------------------------------------------------
- | blkio - block buffered i/o library |
- | Version 1.1.3 |
- ----------------------------------------------------------------------
-
- ======================================================================
- COPYRIGHT
-
- Copyright (c) 1989 Citadel
- All Rights Reserved
-
- Citadel Software, Inc.
- 241 East Eleventh Street
- Brookville, IN 47012
- 317-647-4720
- BBS 317-647-2403
-
- See the file license.txt for copyright information and disclaimer.
-
- ======================================================================
- BLKIO
-
- The blkio library is a buffered input/output library for C similar to
- the stdio library but designed for use with structured files. The LRU
- (least recently used) replacement algorithm is used for buffering.
- The reference manual is embedded in the source code (see INSTALLATION
- INSTRUCTIONS, below). For additional information on using the
- library, see the article "A Buffered I/O Library for Structured Files"
- in the October 1989 issue of "The C Users Journal."
-
- The blkio library is a component of cbase, a complete multiuser C
- database file management library developed by Citadel. A trial copy
- of cbase may be obtained on the Citadel BBS.
-
- ======================================================================
- INSTALLATION INSTRUCTIONS
-
- Before installing blkio, the manx utility should be compiled and
- placed in a directory in the path. manx is used to extract the
- reference manual. If manx was not received with blkio, it can be
- downloaded from the Citadel BBS.
-
- Since C compilers are currently at various stages of ANSI compliance,
- the user must specify to blkio what ANSI features are supported by
- his compiler. This is done by setting a set of ANSI compatibility
- macros that have been isolated in the file ansi.h. For instance, the
- macro AC_PROTO should be defined if function prototypes are supported.
- As distributed, ansi.h is set up for a fully ANSI compliant compiler.
- After ansi.h is set up, it should be copied to the include directory.
- Isolating these definitions in a separate header outside of blkio
-
- Citadel 91/09/23
- allows ansi.h to be readily available to applications and other
- libraries not using blkio.
-
- To select the operating system, set the OPSYS macro in the private
- header file blkio_.h. The modifications necessary to port blkio to a
- new operating system should not prove difficult, consisting mostly of
- direct translations of system calls such as open, close, and lseek.
- All operating system dependent code is located in the files buops.c
- and lockb.c.
-
- To select the C compiler, set the CCOM macro in blkio_.h. The
- modifications necessary to port to a new C compiler should be minimal
- (<ansi.h> will take care of most compiler differences), consisting
- only of translations of header file names and macro names such as
- those used by open and lseek.
-
- If only single-user applications are to be developed, the SINGLE_USER
- macro in blkio_.h can be defined to disable the file locking system
- calls. This is primarily intended to allow DOS applications to run
- without requiring share to be loaded. Note that it is still necessary
- to use the cbase locking functions in order to set flags checked
- internally by cbase.
-
- Because of the lack of uniformity among DOS C compilers, exact
- installation procedures for this system vary widely. The supplied
- batch file install.bat is written for Borland Turbo C. install.bat
- takes two arguments. The first specifies the memory model, legal
- values for which are s, m, c, l, and h; the library file is named
- blkiom.lib, where m would correspond to the memory model of the
- library. The second, if present, causes the reference manual to be
- extracted from the source code into the file blkio.man. See the
- comments at the head of install.bat for notes on editing it for
- other C compilers and differences in your system configuration.
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- Citadel 91/09/23
- UNIX
- 1. Set the OPSYS macro in blkio_.h to OS_UNIX.
- 2. Set the CCOM macro in blkio_.h to the C compiler being used.
- 3. Include or exclude the SINGLE_USER macro in blkio_.h as
- desired.
- 4. Install the boolean header file.
- $ su
- # cp bool.h /usr/include
- # ^d
- 5. Extract the reference manual.
- $ make man
- 6. Build the blkio library.
- $ make blkio
- 7. Install the blkio library. This will copy the blkio header
- file blkio.h to /usr/include and the blkio library archive
- to /usr/lib.
- $ su
- # make install
- # ^d
-
-
- DOS
- 1. Set the OPSYS macro in blkio_.h to OS_DOS.
- 2. Set the CCOM macro in blkio_.h to the C compiler being used.
- 3. Include or exclude the SINGLE_USER macro in blkio_.h as
- desired.
- 4. If necessary, modify install.bat for the C compiler being
- used.
- 5. Extract the reference manual, then build and install the blkio
- library.
- > install h x
- Install may be rerun (without the x argument) for each desired
- memory model.
-
- ======================================================================
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- Citadel 91/09/23
- ----------------------------------------------------------------------
- | cbase - The C Database Library |
- | Version 1.0.2 |
- ----------------------------------------------------------------------
-
- cbase is a complete multiuser C database file management library,
- providing indexed and sequential access on multiple keys. It features
- a layered architecture and comprises four individual libraries.
-
- -----------------------------------
- | ISAM* |
- -----------------------------------
- | File Structure |
- -----------------------------------
- | Buffered I/O |
- -----------------------------------
- | file system |
- -----------------------------------
- cbase Architecture
-
- -----------------------------------
- | cbase |
- -----------------------------------
- | lseq | btree |
- -----------------------------------
- | blkio |
- -----------------------------------
- | operating system |
- -----------------------------------
- cbase Libraries
-
- The four libraries are:
-
- cbase - C database library for indexed and sequential access
- lseq - doubly linked sequential file management library
- btree - B+-tree file management library
- blkio - block buffered input/output library
-
- cbase internally uses lseq for record storage and btree for inverted
- file index storage, which in turn use blkio for file access and
- buffering. blkio is analagous to stdio but based on a file model more
- appropriate for structured files such as used in database software.
-
- The lower level libraries can also be accessed directly for use
- independent of cbase. For example, the btree library can be used to
- manipulate B+-trees for purposes other than inverted files, and the
- blkio library to develop new structured file management libraries.
-
-
- * ISAM stands for Indexed Sequential Access Method.
-
- Citadel 91/09/23
- cbase Features
- --------------
- Portable:
- - Written in strict adherence to ANSI C standard.
- - K&R C compatibility maintained.
- - All operating system dependent code is isolated to a small portion
- of the blkio library to make porting to new systems easy.
- - UNIX and DOS currently supported.
- Buffered:
- - Both records and indexes are buffered using LRU (least recently
- used) buffering.
- Fast and efficient random access:
- - B+-trees are used for inverted file key storage.
- - Multiple keys are supported.
- - Both unique and duplicate keys are supported.
- Fast and efficient sequential access:
- - B+-trees also allow keyed sequential access.
- - Records are stored in doubly linked lists for non-keyed sequential
- access.
- - Both types of sequential access are bidirectional.
- Multiuser:
- - Read-only locking.
- Other Features:
- - Text file data import and export.
- - Custom data types can be defined.
- - Marker used to detect corrupt files.
- - Reference documentation is in standard UNIX manual entry format,
- including errno values.
- Utilities:
- - cbddlp, a data definition language processor, is provided to
- automatically generate the C code defining a database.
-
-
- $77 plus shipping VISA/MasterCard
-
- All source code included.
- No run-time fees or royalties.
-
- Citadel Software, Inc.
- 241 East Eleventh Street
- Brookville, IN 47012
- 317-647-4720
- BBS 317-647-2403
-
- An evaluation copy of cbase can be obtained at no charge on the
- Citadel BBS, or send $5 for diskette.
-
-
-
-
-
- Citadel 91/09/23