minix/games/fortune/strfile/strfile.8

.\"	$NetBSD: strfile.8,v 1.16 2013/09/19 00:58:11 uwe Exp $
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.\" This code is derived from software contributed to Berkeley by
.\" Ken Arnold.
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.\"     @(#)strfile.8	8.1 (Berkeley) 6/9/93
.\"
.Dd January 17, 2010
.Dt STRFILE 8
.Os
.Sh NAME
.Nm strfile ,
.Nm unstr
.Nd "create a random access file for storing strings"
.Sh SYNOPSIS
.Nm
.Op Fl iorsx
.Op Fl c Ar char
.Ar source_file
.Op Ar output_file
.Nm unstr
.Ar source_file
.Sh DESCRIPTION
.Nm
reads a file containing groups of lines separated by a line containing
a single percent
.Ql \&%
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
.Ar source_file Ns Sy .dat .
.Pp
The options are as follows:
.Bl -tag -width "-c char"
.It Fl c Ar char
Change the delimiting character from the percent sign to
.Ar char .
.It Fl i
Ignore case when ordering the strings.
.It Fl 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
.Dv STR_ORDERED
bit in the header
.Fa str_flags
field to be set.
.It Fl r
Randomize access to the strings.
Entries in the offset table will be randomly ordered.
This option causes the
.Dv STR_RANDOM
bit in the header
.Fa str_flags
field to be set.
.It Fl s
Run silently; don't give a summary message when finished.
.It Fl x
Note that each alphabetic character in the groups of lines is rotated
13 positions in a simple caesar cipher.
This option causes the
.Dv STR_ROTATED
bit in the header
.Fa str_flags
field to be set.
.El
.Pp
The format of the header is:
.Bd -literal -offset indent
#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 */
.Ed
.Pp
All fields are written in big-endian byte order.
.Pp
The purpose of
.Nm unstr
is to undo the work of
.Nm .
It prints out the strings contained in the file
.Ar source_file
in the order that they are listed in the header file
.Ar source_file Ns Sy .dat
to standard output.
It is possible to create sorted versions of input files by using
.Fl o
when
.Nm
is run and then using
.Nm unstr
to dump them out in the table order.
.Sh FILES
.Bl -tag -width strfile.out -compact
.It Pa strfile.dat
default output file.
.El
.Sh SEE ALSO
.Xr byteorder 3 ,
.Xr fortune 6
.Sh HISTORY
The
.Nm
utility first appeared in
.Bx 4.4 .