Dec 192017
Spell checker with C source code.
File SSPELL14.ZIP from The Programmer’s Corner in
Category C Source Code
Spell checker with C source code.
File Name File Size Zip Size Zip Type
CACHE.C 4593 1374 deflated
CACHE.H 174 93 deflated
CFGLOAD.C 5461 1449 deflated
CHECK.C 5651 1641 deflated
CHECK.H 52 40 deflated
CONFIG.H 568 337 deflated
DOS.C 2539 840 deflated
ERROR.H 85 66 deflated
FILE.C 7304 2227 deflated
FILE.H 333 149 deflated
IOFN.H 225 96 deflated
MAIN.DCT 173713 47851 deflated
MAIN.STP 23 23 stored
MAKEFILE.TC 815 267 deflated
MAKEFILE.UNX 712 244 deflated
README 10850 4002 deflated
ROOT.C 13001 2843 deflated
ROOT.H 313 156 deflated
RULE.LST 1319 466 deflated
SSPELL.C 8833 2376 deflated
SSPELL.CFG 150 125 deflated
STOP.C 4558 1487 deflated
STOP.H 60 43 deflated
STRFN.H 157 83 deflated
STRING.C 5295 1438 deflated
STRING.H 134 61 deflated
UTILITY.C 4242 1326 deflated
UTILITY.H 52 33 deflated

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Contents of the README file

sspell - similar to Unix spell
version 1.4

Author: Maurice Castro
Release Date: 4 Jul 1992
Bug Reports: [email protected]

This code has been placed by the Author into the Public Domain.
The code is NOT covered by any warranty, the user of the code is
solely responsible for determining the fitness of the program
for their purpose. No liability is accepted by the author for
the direct or indirect losses incurred through the use of this

Segments of this code may be used for any purpose that the user
deems appropriate. It would be polite to acknowledge the source
of the code. If you modify the code and redistribute it please
include a message indicating your changes and how users may
contact you for support.

The author reserves the right to issue the official version of
this program. If you have useful suggestions or changes for the
code, please forward them to the author so that they might be
incorporated into the official version

Please forward bug reports to the author via Internet.

* Introduction

The program SSPELL was written by the author to provide a Unix like
spell checker on a PC. There are several utilities of this type already
available, however, most lacked at least one of the following:

1. Public Domain
2. Source Code
3. Simple, editable word list structure
4. Configurable prefix and suffix list.
5. To use minimal memory
6. To have an unlimited word list length
7. Reasonable speed
8. Portable

The SSPELL program provides all these features. The program currently
compiles under Turbo C++ (Borland) for MS-DOS, DJGCC for MS-DOS, GCC
for Decstations and cc for Unix (OSx for Pyramid, SunOS for Sun 3/50,
Ultrix for Decstation 2100). Minor modification will be required to
compile under other Unix variants.

* Features

The SSPELL program uses a sorted plain ASCII word list for its dictionary.
This makes adding new words to the list easy. Simply add the words and
re-sort the list.

To gain speed, without loading the complete list into memory, a cache
of words recently recovered from the word list is maintained, the disk
is only searched if the word is not found in the cache.

A suffix/prefix list is used to allow a smaller dictionary to be used.

A stop file is provided to permit the exclusion of words. This is typically
used to exclude words that have been incorrectly identified as correct
by applying a rule in the rule list. The stop list is a plain ASCII
word list.

* Operation

Edit the config.h file to set up the required default locations and
compile the code. Place the dictionary in the file specified in the
config.h and make sure that the index file is writable. SSPELL should
now be ready for use.

The SEPARATOR variable should be set to the subdirectory separator for
your system (Unix '/', MS-DOS '\'). The path to the index, dictionary
and rule file is determined by concatenating DICT_PATH with the
separator and the individual file names.

Performance gains may be had by altering the parameters found in the
config.h file. Increasing CACHESIZE increases the memory usage of the
program, but decreases disk search time. IDXSIZ and HASHWID control
the size of the index to the disk file. HASHWID determines the maximum
number of characters compared to determine if an item occurs in a given
slot. IDXSIZ determines the number of slots.

A typical IBM-PC implementation could be written as:

#define DICT_PATH "c:\\utility\\dict"
#define CFGNAME "sspell.cfg"
#define DICTIONARY "main.dct"
#define INDEX "main.idx"
#define STOP "main.stp"
#define RULE "rule.lst"
#define CACHESIZE 1000
#define ROOTNAME "sspell"
#define SORT "c:\\dos\\sort"
#define SEPARATOR "\\"

#define MAXSTR 128
#define SEPSTR " \n\r\[email protected]#$%^&*(),.<>~`\":;|/\\{}[]"

/* HASHWID must always be 2 or greater */
#define HASHWID 8
#define IDXSIZ 1000

* Environment Variable

A single Environment Variable named SSPELL is consulted by SSPELL.
If the environment variable is not set then the `hardwired' default
(ie. the value found in the `config.h' file) will be used.
The Environment variable specifies a path which is concatenated with a
separator and a file name to locate the configuration, dictionary, index
and rule files.

* Configuration file

If a configuration file (typically named "sspell.cfg") is present in the
default directory or the directory specified by the SSPELL environment
variable, the options contained in the file will override the defaults.
These configuration file options can be overridden by command line
options. Example configuration files are shown below:

# configuration file for SSPELL under MSDOS
DICT_PATH "c:\\utility\\dict"
DICTIONARY "main.dct"
INDEX "main.idx"
RULE "rule.lst"
STOP "main.stp"
SORT "c:\\dos\\sort"

# configuration file for SSPELL under Unix
DICT_PATH "/usr/dict"
DICTIONARY "main.dct"
INDEX "main.idx"
STOP "main.stp"
RULE "rule.lst"
SORT "sort -fu"

* Command Line

SSPELL has the following command line options:

sspell [-u] [-v] [-x] [-c config] [-D dict] [-I index] [-R rule]
[-C cachesize] [-S stop] [file] ...

-c`config' is the pathname of a configuration file.

-u Unsorted. The list of words produced is not sorted and contains

-vall words not actually in the word list are printed and plausible
derivations from the word list are indicated

-x all plausible stems are output

-D`dict' is the pathname of an alternate dictionary

-I`index' is the pathname of an alternate index. This should be
used if using a personalised dictionary or if the index file is

-R`rule' is the pathname of an alternate rule list

-S`stop' is the pathname of an alternate stop file

-C`cachesize' is the size of the cache of words found in the

SSPELL will take input from a list of files on the command line or from
stdin if no files are supplied.

The dictionary must be in sorted order with the capital letters folded onto
the small letters. (Using Unix sort: sort -fu). The case of words in the
dictionary is significant. Any letter appearing as a capital in the
dictionary must appear as a capital in the text to be regarded as spelled

The format of the rule list is fixed. `#' in the first column indicates a
comment. All other lines are of the form:


Any field not used must be filled with a `-'. The following examples
illustrate the features of the rules.

pre un - - -
post ive - e -
post ive e - e
post ied y ay,ey,iy,oy,uy y

The prefix rules are simple, their are no required or forbidden sequences
and nothing to delete. Prefixes must not be more complex.

The suffix rules are more complex. These rule specify the ending to be
added to the root after the deletion of the delete field, provided that
the word has a required ending, provided that the combination is not

Example rule:
post ive - e -
The word 'transitive' is found in the document, the suffix 'ive' is
removed and there is no deleted suffix to replace. The new word
'transit' does not end in the forbidden suffix 'e' and there is
no required ending so a search is made in the dictionary for 'transit'.
The word 'deceive' is found in the document, the suffix 'ive' is
removed to produce 'dece'. This ends in the forbidden sequence 'e'
so a search is not made.

Example rule:
post ied y ay,ey,iy,oy,uy y
The word 'carried' is found in the document, the suffix 'ied' is replaced
by the deleted suffix 'y' of the root word to produce 'carry'.
Since 'carry' now ends in the required sequence 'y' and does not end in the
forbidden sequences 'ay','ey','iy', 'oy' or 'uy', a search is made for it in
the dictionary.

Example rule:
post ed ay,ey,iy,oy,uy - -
The word 'delayed' is found in the document, the suffix 'ed' is
removed, and there is no deleted suffix to replace. Since the word
'delay' ends in one of the required endings and does not end in
a forbidden ending (there are none) a search is made in the

* Overview of Internal Operation

SSPELL creates an index file which speeds access to the main dictionary,
the index is a simple list of the first part of words evenly spaced through
the dictionary, the number of significant letters and the number of slots
are set using hash defines in the config.h file.

The index file is only created if: No index file exists or the dictionary
has been modified since the index was created. The Dictionary is checked
for correct ordering during the creation of the index file.

Words are checked for correct spelling by initially checking the cache. The
cache is a move to front list, so more recently used words are at the
front of the cache. The cache size is bounded by a limit set in the config.h
file. If the word is not found in the cache then an exact match is checked
for in the file. If no exact match is found then a derivation is checked
for in the cache and subsequently in the file. If a word in the dictionary
matches either a derivation or the original then the dictionary word is
inserted at the head of the cache list.

Hyphenation and number identification have been left out of the above
description. The output of the search process is put in a file, the
file is then sorted using the local operating system sorting utility.
The result is then listed on standard out such that duplicated lines
appear only once.

* Acknowledgments

My thanks to people who have contributed to this program:

Michael Oldfield ([email protected]) for a number of bug fixes
Mike O'Carroll ([email protected]) for suggestions and bug fixes
Russell Lang for assistance in clarifying documentation and finding bug

* Conclusion

I hope that this program proves useful. Comments and suggestions welcomed;
I can be contacted via E-Mail at [email protected]

Maurice Castro

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