CHRTBL(1M) INTERACTIVE UNIX System CHRTBL(1M)
NAME
chrtbl - generate character classification and conversion
tables
SYNOPSIS
chrtbl [file]
DESCRIPTION
The chrtbl command creates a character classification table
and an upper/lower-case conversion table. The tables are
contained in a byte-sized array encoded such that a table
lookup can be used to determine the character classification
of a character or to convert a character [see ctype(3C)].
The size of the array is 257*2 bytes: 257 bytes are
required for the 8-bit code set character classification
table and 257 bytes for the upper- to lower-case and lower-
to upper-case conversion table.
chrtbl reads the user-defined character classification and
conversion information from file and creates two output
files in the current directory. One output file, ctype.c (a
C-language source file), contains the 257*2-byte array gen-
erated from processing the information from file. You
should review the content of ctype.c to verify that the
array is set up as you had planned. (In addition, an appli-
cation program could use ctype.c.) The first 257 bytes of
the array in ctype.c are used for character classification.
The characters used for initializing these bytes of the
array represent character classifications that are defined
in /usr/include/ctype.h; for example, _L means a character
is lower case and _S|_B means the character is both a spac-
ing character and a blank. The last 257 bytes of the array
are used for character conversion. These bytes of the array
are initialized so that characters for which you do not pro-
vide conversion information will be converted to themselves.
When you do provide conversion information, the first value
of the pair is stored where the second one would be stored
normally, and vice versa; for example, if you provide <0x41
0x61>, then 0x61 is stored where 0x41 would be stored nor-
mally, and 0x61 is stored where 0x41 would be stored nor-
mally.
The second output file (a data file) contains the same
information, but is structured for efficient use by the
character classification and conversion routines [see
ctype(3C)]. The name of this output file is the value of
the character classification chrclass read in from file.
This output file must be installed in the /lib/chrclass
directory under this name by someone who is super-user or a
member of group bin. This file must be readable by user,
group, and other; no other permissions should be set. To
use the character classification and conversion tables on
this file, set the environmental variable CHRCLASS [see
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environ(5)] to the name of this file and export the vari-
able; for example, if the name of this file (and character
class) is xyz, you should issue the commands: CHRCLASS=xyz
; export CHRCLASS .
If no input file is given, or if the argument - is encoun-
tered, chrtbl reads from the standard input file.
The syntax of file allows the user to define the name of the
data file created by chrtbl, the assignment of characters to
character classifications and the relationship between
upper- and lower-case letters. The character classifica-
tions recognized by chrtbl are:
chrclass name of the data file to be created by
chrtbl.
isupper character codes to be classified as upper-
case letters.
islower character codes to be classified as lower-
case letters.
isdigit character codes to be classified as
numeric.
isspace character codes to be classified as a spac-
ing (delimiter) character.
ispunct character codes to be classified as a punc-
tuation character.
iscntrl character codes to be classified as a con-
trol character.
isblank character code for the space character.
isxdigit character codes to be classified as hexade-
cimal digits.
ul relationship between upper- and lower-case
characters.
Any lines with the number sign (#) in the first column are
treated as comments and are ignored. Blank lines are also
ignored.
A character can be represented as a hexadecimal or octal
constant (for example, the letter a can be represented as
0x61 in hexadecimal or 0141 in octal). Hexadecimal and
octal constants may be separated by one or more space and
tab characters.
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CHRTBL(1M) INTERACTIVE UNIX System CHRTBL(1M)
The dash character (-) may be used to indicate a range of
consecutive numbers. Zero or more space characters may be
used for separating the dash character from the numbers.
The backslash character (\) is used for line continuation.
Only a carriage return is permitted after the backslash
character.
The relationship between upper- and lower-case letters (ul)
is expressed as ordered pairs of octal or hexadecimal con-
stants: <upper-case_character lower-case_character>. These
two constants may be separated by one or more space charac-
ters. Zero or more space characters may be used for
separating the angle brackets (< >) from the numbers.
EXAMPLE
The following is an example of an input file used to create
the ASCII code set definition table on a file named ascii:
chrclass ascii
isupper 0x41 - 0x5a
islower 0x61 - 0x7a
isdigit 0x30 - 0x39
isspace 0x20 0x9 - 0xd
ispunct 0x21 - 0x2f 0x3a - 0x40 \
0x5b - 0x60 0x7b - 0x7e
iscntrl 0x0 - 0x1f 0x7f
isblank 0x20
isxdigit 0x30 - 0x39 0x61 - 0x66 \
0x41 - 0x46
ul <0x41 0x61> <0x42 0x62> <0x43 0x63> \
<0x44 0x64> <0x45 0x65> <0x46 0x66> \
<0x47 0x67> <0x48 0x68> <0x49 0x69> \
<0x4a 0x6a> <0x4b 0x6b> <0x4c 0x6c> \
<0x4d 0x6d> <0x4e 0x6e> <0x4f 0x6f> \
<0x50 0x70> <0x51 0x71> <0x52 0x72> \
<0x53 0x73> <0x54 0x74> <0x55 0x75> \
<0x56 0x76> <0x57 0x77> <0x58 0x78> \
<0x59 0x79> <0x5a 0x7a>
FILES
/lib/chrclass/* data file containing character classifica-
tion and conversion tables created by chrtbl
/usr/include/ctype.h
header file containing information used by
character classification and conversion rou-
tines
SEE ALSO
ctype(3C), environ(5) in the INTERACTIVE SDS Guide and
Programmer's Reference Manual.
DIAGNOSTICS
The error messages produced by chrtbl are intended to be
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CHRTBL(1M) INTERACTIVE UNIX System CHRTBL(1M)
self-explanatory. They indicate errors in the command line
or syntactic errors encountered within the input file.
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