The
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:
-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
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.
-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.
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
.
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
is run and then using
unstr
to dump them out in the table order.
