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Top Forums Shell Programming and Scripting Extract sequences of bytes from binary for differents blocks Post 302844354 by Ophiuchus on Monday 19th of August 2013 01:24:04 AM
Old 08-19-2013
Hello ahamed,

Thanks for your help. I've tried the code and extracts the sequences.

Some other things may be pending for me, but I'll investigate how to do it (like printing some bytes as decimal, etc).

I was trying to print all the sequences for each block in the same line, but I'm only able to print correctly the firsts sequences fine, but the sequences of sub-block still appears in different line.

I was trying modifying the print routine as below, but is no correct yet for my goal.
Code:
void print_data(const unsigned char *ptr, int len)
{
        int i;
        printf("%02x", ptr[0]);
        printf(" ");        
        for(i=1;i<=3;i++)
                printf("%02x", ptr[i]);
        printf(" ");        
        for(i=4;i<=11;i++)
                printf("%02x", ptr[i]);
        printf(" ");
        for(i=12;i<=19;i++)
                printf("%02x", ptr[i]);           
        printf("\n");        
        return;
}

The desired output is:
Code:
32 000001 991145278934550f 73494549232fffff 
32 000002 991145278934551f 73494554768fffff 80 0f 01 02 00000030 7349526905ffffff 00 81 .... 83 ... 87 ...

Thanks again.

Regards
 

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SEQ(1)							    BSD General Commands Manual 						    SEQ(1)

NAME
seq -- print sequences of numbers SYNOPSIS
seq [-w] [-f format] [-s string] [-t string] [first [incr]] last DESCRIPTION
The seq utility prints a sequence of numbers, one per line (default), from first (default 1), to near last as possible, in increments of incr (default 1). When first is larger than last the default incr is -1. All numbers are interpreted as floating point. Normally integer values are printed as decimal integers. The seq utility accepts the following options: -f format Use a printf(3) style format to print each number. Only the A, a, E, e, F, f, G, g, and % conversion characters are valid, along with any optional flags and an optional numeric mimimum field width or precision. The format can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). The default is %g. -s string Use string to separate numbers. The string can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). The default is . -t string Use string to terminate sequence of numbers. The string can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). This option is useful when the default separator does not contain a . -w Equalize the widths of all numbers by padding with zeros as necessary. This option has no effect with the -f option. If any sequence numbers will be printed in exponential notation, the default conversion is changed to %e. The seq utility exits 0 on success and non-zero if an error occurs. EXAMPLES
# seq 1 3 1 2 3 # seq 3 1 3 2 1 # seq -w 0 .05 .1 0.00 0.05 0.10 SEE ALSO
jot(1), printf(1), printf(3) HISTORY
The seq command first appeared in Plan 9 from Bell Labs. A seq command appeared in NetBSD 3.0. This command was based on the command of the same name in Plan 9 from Bell Labs and the GNU core utilities. The GNU seq command first appeared in the 1.13 shell utilities release. BUGS
The -w option does not handle the transition from pure floating point to exponent representation very well. The seq command is not bug for bug compatible with the Plan 9 from Bell Labs or GNU versions of seq. BSD
May 27, 2010 BSD
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