Re: debugging /usr/bin/info reading compressed files

[Randall R Schulz <rrschulz at cris dot com>]

Joshua,

Gzip / gunzip doesn't handle BZip2-compressed files.

I can think of two alternatives for gixing "info:" Make "info" sensitive to 
the variant compression scheme based on file name suffixes or introduce a 
separate decompression program (script or binary) to handle the variant 
compression formats and have "info" invoke that intermediary instead of 
directly invoking a single-format decompression utility.

Randall Schulz
Mountain View, CA USA



At 09:08 2002-08-03, Joshua Daniel Franklin wrote:
> Hi. The /usr/bin/info program is supposed to be able to automatically
> read compressed files, but this functionality is broken on Cygwin for
> some reason. I've tracked it down to a function in info's filesys.c
> that is failing. The code, with some debugging statements I've added, is:
>
>   stream = popen (command, FOPEN_RBIN);
>     /* FOO */
>     printf("%s\n", command);
>   if (stream)
>     {
>     /* This never gets printed */
>     printf("stream OK\n");
>     }
>     /* end FOO */
>
> The output looks like this:
> $ ./ginfo.exe -f ./gzip.info.bz2
> COMMAND IS:bunzip2.exe < /usr/local/src/texinfo-4.2/info/./gzip.info.bz2
> info: ./gzip.info.bz2: Invalid argument
>
> >From bash, running the command,
> $ bunzip2.exe < /usr/local/src/texinfo-4.2/info/./gzip.info.bz2
> produces the expected file on STDOUT.
>
> As far as I can tell popen() works in Cygwin (it's listed under
> 'Other' fuctions in the API Ref), but I have no experience using it.
> Anyone know what needs to be done for this to work?
>
> Attached is some strace output...I deleted about 200 lines of ginfo trying
> to guess the filename, please let me know if more (or less) is needed.
>
> Thanks.

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