* configure.ac: Check for srand48 and drand48.

* src/misc/random.cc (srand, drand): Use srand48 and drand48 if
available.

ChangeLog

 2004-11-12  Alexandre Duret-Lutz  <adl@src.lip6.fr>
 
+	* configure.ac: Check for srand48 and drand48.
+	* src/misc/random.cc (srand, drand): Use srand48 and drand48 if
+	available.
+
 	* src/tgbaalgos/randomgraph.cc, src/tgbaalgos/randomgraph.hh: New files.
 	* src/tgbaalgos/Makefile.am (tgbaalgos_HEADERS)
 	(libtgbaalgos_la_SOURCES): Add them.

configure.ac

@@ -45,6 +45,8 @@ AX_CHECK_BUDDY
 AX_CHECK_LBTT
 AX_CHECK_GSPNLIB
 
+AC_CHECK_FUNCS([srand48 drand48])
+
 AC_LIBTOOL_WIN32_DLL
 AC_PROG_LIBTOOL
 

src/misc/random.cc

@@ -27,24 +27,30 @@ namespace spot
   void
   srand(unsigned int seed)
   {
+#if HAVE_SRAND48 && HAVE_DRAND48
+    ::srand48(seed);
+#else
     ::srand(seed);
+#endif
   }
 
   double
   drand()
   {
+#if HAVE_SRAND48 && HAVE_DRAND48
+    return ::drand48();
+#else
     double r = ::rand();
     return r / (1.0 + RAND_MAX);
+#endif
   }
 
   int
   mrand(int max)
   {
-    int res = static_cast<int>(max * drand());
-    return res;
+    return static_cast<int>(max * drand());
   }
 
-
   int
   rrand(int min, int max)
   {