strfile.8

.\" Copyright (c) 1989 The Regents of the University of California.
.\" All rights reserved.
.\" 
.\" This code is derived from software contributed to Berkeley by
.\" Ken Arnold.
.\"
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.\"	@(#)strfile.8	5.8 (Berkeley) 6/24/90
.\"
.TH STRFILE 8 "June 24, 1990"
.UC 4
.SH NAME
strfile, unstr \- create a random access file for storing strings
.SH SYNOPSIS
.B strfile [
.I \-iorsx
.B ] [
.I \-c char
.B ]
.I source_file
.B [
.I output_file
.B ]
.br
.B unstr
.I source_file
.SH DESCRIPTION
.I Strfile
reads a file containing groups of lines separated by a line containing
a single percent (``%'') sign and creates a data file which contains
a header structure and a table of file offsets for each group of lines.
This allows random access of the strings.
.PP
The output file, if not specified on the command line, is named
\fIsource_file\fB.out\fR.
.PP
The options are as follows:
.TP
.BI \-c \ char
Change the delimiting character from the percent sign to
.IR char .
.TP
.B \-i
Ignore case when ordering the strings.
.TP
.B \-o
Order the strings in alphabetical order.
The offset table will be sorted in the alphabetical order of the
groups of lines referenced.
Any initial non-alphanumeric characters are ignored.
This option causes the STR_ORDERED bit in the header
.I str_flags
field to be set.
.TP
.B \-r
Randomize access to the strings.
Entries in the offset table will be randomly ordered.
This option causes the STR_RANDOM bit in the header
.I str_flags
field to be set.
.TP
.B \-s
Run silently; don't give a summary message when finished.
.TP
.B \-x
Note that each alphabetic character in the groups of lines is rotated
13 positions in a simple caesar cypher.
This option causes the STR_ROTATED bit in the header
.I str_flags
field to be set.
.PP
The format of the header is:
.in +5
.nf
#define	VERSION	1
unsigned long	str_version;	/* version number */
unsigned long	str_numstr;	/* # of strings in the file */
unsigned long	str_longlen;	/* length of longest string */
unsigned long	str_shortlen;	/* length of shortest string */
#define	STR_RANDOM	0x1	/* randomized pointers */
#define	STR_ORDERED	0x2	/* ordered pointers */
#define	STR_ROTATED	0x4	/* rot-13'd text */
unsigned long	str_flags;	/* bit field for flags */
char str_delim;			/* delimiting character */
.fi
.PP
All fields are written in network byte order.
.PP
The purpose of
.I unstr
is to undo the work of
.IR strfile .
It prints out the strings contained in the file
.I source_file
in the order that they are listed in
the header file
.IB source_file .dat
to standard output.
It is possible to create sorted versions of input files by using
.B \-o
when
.I strfile
is run and then using
.I unstr
to dump them out in the table order.
.SH "SEE ALSO"
byteorder(3), fortune(6)