memstat-0.9 hurd patch (PATH_MAX)

[Tanguy LE CARROUR]

Dear Hurd developers,

Here is my first attempt to fix a PATH_MAX related FTBFS. So please, be indulgent!

1) Why memstat?

Because of PATH_MAX, I though would be easy to fix. Also because the source code was relatively small.

This package maybe useless but I needed something to start with...

2) Parts to fix

 a) use of PATH_MAX to create a char[] to store a path 

 b) use of PATH_MAX to read line from a file (that contains 1 file path on each line) in a char[] buffer 

 c) use of readlink(str1, str2, PATH_MAX)

3) Fix...

 a) "piece of cake" (TM), but include <math.h> (for log10() function) to get an accurate length for the buffer... which may be an overhead!

 b) read file lines in a dynamically re-sized buffer

 c) use lstat as described in readlink man page

4) Results

The code build on Hurd. dpkg-buildpackage successful.

5) But...

 - memstat uses /proc/XYZ/exe and /proc/XYZ/maps... and the output of memstat on Hurd is different than the one on Linux

 - implement (copy/paste mostly) a get_line function. Might have been better to use the GNU get_line()... or not?!

Feel free to make comments on everything (code, decisions, style), I know that I still have a lot to learn! 

Hope to be more helpful in the future,

Tanguy

memstat-0.9.hurd.patch
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