1 files changed, 114 insertions, 0 deletions
diff --git a/gsl-1.9/ieee-utils/env.c b/gsl-1.9/ieee-utils/env.c
new file mode 100644
index 0000000..efff49c
--- /dev/null
+++ b/gsl-1.9/ieee-utils/env.c
@@ -0,0 +1,114 @@
+/* ieee-utils/env.c
+ * 
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <gsl/gsl_ieee_utils.h>
+#include <gsl/gsl_errno.h>
+
+void
+gsl_ieee_env_setup (void)
+{
+  const char * p = getenv("GSL_IEEE_MODE") ;
+
+  int precision = 0, rounding = 0, exception_mask = 0 ;
+
+  int comma = 0 ;
+
+  if (p == 0)  /* GSL_IEEE_MODE environment variable is not set */
+    return ;
+
+  if (*p == '\0') /* GSL_IEEE_MODE environment variable is empty */
+    return ;
+
+  gsl_ieee_read_mode_string (p, &precision, &rounding, &exception_mask) ;
+
+  gsl_ieee_set_mode (precision, rounding, exception_mask) ;
+  
+  fprintf(stderr, "GSL_IEEE_MODE=\"") ;
+
+  /* Print string with a preceeding comma if the list has already begun */
+
+#define PRINTC(x) do {if(comma) fprintf(stderr,","); fprintf(stderr,x); comma++ ;} while(0)
+  
+  switch (precision) 
+    {
+    case GSL_IEEE_SINGLE_PRECISION:
+      PRINTC("single-precision") ;
+      break ;
+    case GSL_IEEE_DOUBLE_PRECISION:
+      PRINTC("double-precision") ;
+      break ;
+    case GSL_IEEE_EXTENDED_PRECISION:
+      PRINTC("extended-precision") ;
+      break ;
+    }
+
+  switch (rounding) 
+    {
+    case GSL_IEEE_ROUND_TO_NEAREST:
+      PRINTC("round-to-nearest") ;
+      break ;
+    case GSL_IEEE_ROUND_DOWN:
+      PRINTC("round-down") ;
+      break ;
+    case GSL_IEEE_ROUND_UP:
+      PRINTC("round-up") ;
+      break ;
+    case GSL_IEEE_ROUND_TO_ZERO:
+      PRINTC("round-to-zero") ;
+      break ;
+    }
+
+  if ((exception_mask & GSL_IEEE_MASK_ALL) == GSL_IEEE_MASK_ALL)
+    {
+      PRINTC("mask-all") ;
+    }
+  else if ((exception_mask & GSL_IEEE_MASK_ALL) == 0)
+    {
+      PRINTC("trap-common") ;
+    }
+  else 
+    {
+      if (exception_mask & GSL_IEEE_MASK_INVALID)
+        PRINTC("mask-invalid") ;
+      
+      if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
+        PRINTC("mask-denormalized") ;
+      
+      if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
+        PRINTC("mask-division-by-zero") ;
+      
+      if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
+        PRINTC("mask-overflow") ;
+      
+      if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
+        PRINTC("mask-underflow") ;
+    }
+
+  if (exception_mask & GSL_IEEE_TRAP_INEXACT)
+    PRINTC("trap-inexact") ;
+  
+  fprintf(stderr,"\"\n") ;
+}
+
+
+
+
+