[GRASS5] Libgrass_gis on Mingw - open.c patch

[Javier A. Yebrin]

Hi all!
This patch solves the problem of binary files read/write under win32.
Practically forces the c runtime to binary-mode file translation as 
default.
It is not the cleanest way but it is simple.
More info at: http://www.mingw.org/MinGWiki/index.php/binary

Cheers,

Javier Yebrin





Javier A. Yebrin wrote:

> Finally I've got most of grass modules compiled under Mingw/Msys. Then 
> started to test them (first the raster modules, of course), and found 
> some strange behaviour depending on the studied raster. I've used the 
> Spearfish database and ran r.sum for all the present rasters (using 
> spot.image to define the current region). These are the results(first 
> line the raster name, then the stdout or
> stderr):

> aspect
> WARNING: Fail of initial read of compressed file [aspect in PERMANENT]

> You may see that the response changes from one type of raster to 
> another, whether it is compresed or not. I'm trying to debug this 
> module at the moment...
> 
> In the meanwhile, do you have any ideas?

The usual reason for that error message on Windows is that something is
performing CRLF->LF conversion, which is inappropriate for a binary file.

ISTR that the MinGW runtime includes a function to enable/disable the
conversions. You need to ensure that all I/O is done without conversions.

-- 
Glynn Clements <glynn at gclements.plus.com>
-------------- next part --------------
diff -u -r /home/javier/grass-6.1.cvs_src_snapshot_2005_05_07/lib/gis/open.c /home/javier/static_grass/lib/gis/open.c
--- /home/javier/grass-6.1.cvs_src_snapshot_2005_05_07/lib/gis/open.c	Tue Nov  9 12:20:13 2004
+++ /home/javier/static_grass/lib/gis/open.c	Thu May 12 15:14:09 2005
@@ -83,6 +83,13 @@
 #include <unistd.h>
 #include <fcntl.h>
 
+#ifdef __MINGW32__ 
+#include <stdlib.h> /*  _fmode */
+#include <fcntl.h> /*  _O_BINARY */
+#undef _fmode
+int _fmode = _O_BINARY;
+#endif 
+
 int G__open (
     char *element,
     char *name,