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.Dd February 17, 2005
.Dt STRFILE 8
.Os
.Sh NAME
.Nm strfile ,
.Nm unstr
.Nd "create a random access file for storing strings"
.Sh SYNOPSIS
.Nm
.Op Fl Ciorsx
.Op Fl c Ar char
.Ar source_file
.Op Ar output_file
.Nm unstr
.Ar source_file
.Sh DESCRIPTION
The
.Nm
utility
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 Pa .dat .
.Pp
The options are as follows:
.Bl -tag -width ".Fl c Ar char"
.It Fl C
Flag the file as containing comments.
This option cases the
.Dv STR_COMMENTS
bit in the header
.Va str_flags
field to be set.
Comments are designated by two delimiter characters at the
beginning of the line, though
.Nm
does not give any special
treatment to comment lines.
.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
.Va 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
.Va str_flags
field to be set.
.It Fl s
Run silently; do not 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 cypher.
This option causes the
.Dv STR_ROTATED
bit in the header
.Va str_flags
field to be set.
.El
.Pp
The format of the header is:
.Bd -literal
#define	VERSION	1
uint32_t	str_version;	/* version number */
uint32_t	str_numstr;	/* # of strings in the file */
uint32_t	str_longlen;	/* length of longest string */
uint32_t	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 */
#define	STR_COMMENTS	0x8	/* embedded comments */
uint32_t	str_flags;	/* bit field for flags */
char		str_delim;	/* delimiting character */
.Ed
.Pp
All fields are written in network 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 Pa .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 ".Pa strfile.dat" -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 .