[Dwarf-Discuss] _dwarf_p_error(): Does it correctly handle negative error values?
davea42 at earthlink.net
Fri Jan 21 10:30:24 PST 2011
On 01/21/2011 07:57 AM, Ron Louzon wrote:
> Sorry, somehow the original question became garbled. Here is the same post in
> ungarbled form:
...[ Thanks, that helps, deleted here to save space]
> If the supplied "errval" is negative, the conversion code "-errval-1" is used to
> convert "errval" to a positive index.
> Assume that "errval" had a value of -5. This conversion generates an index of 4
> which is then used to retrieve a string from the _dwarf_errmsgs table. Was it
> intended to have an index which is off by 1 or should the conversion be using
> the positive equivalent of "errval" as an index into the _dwarf_errmsgs table?
I do not recall any intent to support negative numbers as error values,
it is possible that an early version of libdwarf had negatives as error
Indeed I vaguely recall that libdwarf error numbers had negative values
very early on
(meaning 1991-1994). But now negative error values should not be
I cannot remember why that libdwarf-internal function treats negatives
as it does,
but it seems unimportant (unless there is something I am missing here).
Perhaps a comment in the source about the intent would be a good idea.
Maybe it's in the basement, let me go up stairs and check . -- M. C. Escher
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