[igraph] igraph 0.5.x visual studio 2005 'fixes'

[Laurence Muller]

Hi,

Recently I modified the latest version of igraph 0.5.x to make it work 
with Visual Studio 2005.
While this modified version isn't bug free, it is in quite a usable state.

As far as I know, only the graph file reading/writing part is broken 
(GML GraphML etc).

The full (modified) source code (changelist below), developer binaries 
(include dir + lib file) and an example project are available at the 
following location:
http://www.multigesture.net/projects/igraph-05x-visual-studio-2005-fix/


List of changes:

Using revision 1294
Repository: https://code.launchpad.net/~igraph/igraph/0.5-main

1. bliss_timer.cc line 18, Remove or make the following line a comment:
#include <unistd.h>

2. Add #ifndef YY_NO_UNISTD_H at the top of the following files:
foreign-gml-lexer.c
foreign-lgl-lexer.c
foreign-ncol-lexer.c
foreign-pajek-lexer.c

After these 'fixes' the library will build (igraph.lib) but not work yet.
When trying the examples from:
http://cneurocvs.rmki.kfki.hu/igraph/doc/html/ch03s01.html
http://cneurocvs.rmki.kfki.hu/igraph/doc/html/ch03s03.html

3. Fix the missing _ifinite issue:
Add in random.c:
#include <float.h>

4. Fix the missing isnan issue (also in random.c, _isnan requires float.h):
int R_isnancpp(double x)
{
   return (_isnan(x)!=0);
   // return (isnan(x)!=0);
}

and

#ifdef __cplusplus
   int R_isnancpp(double); /* in arithmetic.c */
   #define ISNAN(x) R_isnancpp(x)
#else
   //#define ISNAN(x) (isnan(x)!=0)
   #define ISNAN(x) (_isnan(x)!=0)
#endif

5. Fix the missing round issue (also in random.c):
Add this line near the includes at the top:

int round (double x)
{
   int i = (int) x;

   if (x >= 0.0)
   {
       return ((x-i) >= 0.5) ? (i + 1) : (i);
   }
   else
   {
       return (-x+i >= 0.5) ? (i - 1) : (i);
   }
}

6. Fix the missing isnan issue (in math.c)
change line 44:
return (!isnan(x) & (x != IGRAPH_POSINFINITY) & (x != IGRAPH_NEGINFINITY));
to
return (!_isnan(x) & (x != IGRAPH_POSINFINITY) & (x != IGRAPH_NEGINFINITY));

7. igraph.lib(structure_generators.obj):
error LNK2019: unresolved external symbol _strcasecmp referenced in 
function _igraph_famous
solution
http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/cf092a87-3256-4d02-81c6-57c707e71e13/

add this at the top of the file:
#if defined(WIN32) || defined(WIN64)
#define strcasecmp _stricmp
#endif /* Def WIN32 or Def WIN64 */

------------------------------------------
Laurence Muller (M.Sc.)

Website/Blog/Portfolio:
http://www.multigesture.net/