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Full Discussion: Find and increment value in string of hex
Top Forums Shell Programming and Scripting Find and increment value in string of hex Post 303009762 by Don Cragun on Tuesday 19th of December 2017 01:27:50 PM
Old 12-19-2017
Hi securegooner,
If you increment 7F to 80 and on subsequent runs to 81, 82, 83, and 84; you then have an ambiguity as to where the string starting with 84 starts. Should the string 84017Fa7 be incremented to 84020080a7 or to 84020100a7??? And, can there only be values 01 and 02 after the leading 84? Or, should 8402FFFFa7 or 84027F7Fa7 be incremented to 8403010000a7?

And will you really have an uppercase 7F and a lowercase a7?

Please be very sure that your specification is clear and complete and accurately specifies what you are trying to do.

Hi RudiC,
Note also that using match($0,/84[^a]*a7/) may get a false match on even byte boundaries such as 0840a7 and RSTART and RLENGTH won't be set correctly for a cases like 08012aa7 and 08020a0aa7.

To get proper alignment, we have to be sure tha characters are matched in pairs starting on odd character boundaries.
This User Gave Thanks to Don Cragun For This Post:
RudiC
 

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LEARN ABOUT CENTOS

acpihelp

ACPIHELP(1)						      General Commands Manual						       ACPIHELP(1)

NAME

       acpihelp - ACPI help utility

SYNOPSIS

       acpihelp <option>...  [<name-prefix>|<hex-value>]

DESCRIPTION

       This manual page briefly documents the acpihelp command. The option list is taken from the acpihelp interactive help.

       acpihelp provides descriptive text for AML and ASL keywords, methods, and opcodes.

       Much more detailed documentation may be found at http://www.acpica.org/documentation/.

       If neither a <name-prefix> or a <hex-value> is provided, acpihelp will do the logical equivalent of a "display all."

       A default search (that is, a search with no options) and a <name-prefix> can mean two different things: (1) if <name-prefix> does not start
       with an underscore, find ASL operator names, or (2) if <name-prefix> does start with an underscore, find ASL predefined method names.

OPTIONS

   ACPI Names and Symbols
       -k [<name-prefix>]
	      Find/Display ASL non-operator keyword(s)

       -m [<name-prefix>]
	      Find/Display AML opcode name(s)

       -p [<name-prefix>]
	      Find/Display ASL predefined method name(s)

       -s [<name-prefix>]
	      Find/Display ASL operator name(s)

   ACPI Values
       -e [<hex-value>]
	      Decode ACPICA exception code

       -i     Display known ACPI Device IDs (_HID)

       -i [<hex-value>]
	      Decode hex AML opcode

AUTHOR

       acpihelp was written by Robert Moore <robert.moore@intel.com>.

       This manual page was written by Al Stone <ahs3@redhat.com> for the Fedora project (but may be used by others).

								 January 23, 2013						       ACPIHELP(1)
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