Lua inputbox: Allow negative values and floating point input. Unfinished, has problems of display (mouse cursor cleaning, display cleaning and alignment, removing redundant digits like in 15.000)

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1354 416bcca6-2ee7-4201-b75f-2eb2f807beb1

misc.c

@@ -24,6 +24,7 @@
 #include <string.h>
 #include <strings.h>
 #include <stdlib.h>
+#include <math.h>
 #include "struct.h"
 #include "sdlscreen.h"
 #include "global.h"
@@ -811,6 +812,14 @@ int Max(int a,int b)
   return (a>b)?a:b;
 }
 
+/* Round number n to d decimal points */
+double Fround(double n, unsigned d)
+{
+  double exp;
+  exp = pow(10.0, d);
+  return floor(n * exp + 0.5) / exp;
+}
+
 
 // Fonction retournant le libellé d'une mode (ex: " 320x200")
 char * Mode_label(int mode)