pnu-strfile 1.0.0

create a random access file for storing strings

Installation

pip install pnu-strfile

STRFILE(8), UNSTR(8)

NAME

strfile, unstr — create a random access file for storing strings

SYNOPSIS

strfile [-Ciorsx] [-c char] [--debug] [--help|-?] [--version] [--] source_file [output_file]

unstr [--debug] [--help|-?] [--version] [--] source_file

DESCRIPTION

The strfile utility 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.

The output file, if not specified on the command line, is named source_file.dat.

The options are as follows:

Options	Use
-C	Flag the file as containing comments. This option cases the STR_COMMENTS bit in the header str_flags field to be set. Comments are designated by two delimiter characters at the beginning of the line, though strfile does not give any special treatment to comment lines.
-c char	Change the delimiting character from the percent sign to char.
-i	Ignore case when ordering the strings.
-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 str_flags field to be set.
-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 str_flags field to be set. The -o option has precedence over the -r option.
-s	Run silently; do not give a summary message when finished.
-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 str_flags field to be set.
--debug	Enable debug mode
--help|-?	Print usage and a short help message and exit
--version	Print version and exit
--	Options processing terminator

The format of the header is:

#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 */

All fields are written in network byte order.

The purpose of unstr is to undo the work of strfile. It prints out the strings contained in the file source_file in the order that they are listed in the header file source_file.dat to standard output. It is possible to create sorted versions of input files by using -o when strfile is run and then using unstr to dump them out in the table order.

ENVIRONMENT

The STRFILE_DEBUG and UNSTR_DEBUG environment variables can also be set to any value to enable debug mode.

SEE ALSO

byteorder(3), fortune(6)

STANDARDS

This implementation is fully compatible with the FreeBSD version.

It tries to follow the PEP 8 style guide for Python code.

HISTORY

Contributed by Ken Arnold, the strfile utility first appeared in 2.9BSD.

This implementation was made for The PNU project.

LICENSE

This utility is available under the 3-clause BSD license.

AUTHORS

This version was written by Hubert Tournier.

The man page is derived from the FreeBSD project's one.