2007-12-12  Jakub Jelinek  <jakub@redhat.com>

	PR libfortran/34427

	Revert:
	2007-12-08  Tobias Burnus  <burnus@net-b.de>

	PR fortran/34319
	* io/list_read.c (parse_real, read_real): Support NaN/Infinity.

	* gfortran.dg/nan_3.f90: New.

--- libgfortran/io/list_read.c	(revision 130708)
+++ libgfortran/io/list_read.c	(revision 130707)
@@ -1078,12 +1078,7 @@ parse_real (st_parameter_dt *dtp, void *
     }
 
   if (!isdigit (c) && c != '.')
-    {
-      if (c == 'i' || c == 'I' || c == 'n' || c == 'N')
-	goto inf_nan;
-      else
-	goto bad;
-    }
+    goto bad;
 
   push_char (dtp, c);
 
@@ -1141,13 +1136,7 @@ parse_real (st_parameter_dt *dtp, void *
 
  exp2:
   if (!isdigit (c))
-    {
-      if (c == 'i' || c == 'I' || c == 'n' || c == 'N')
-	goto inf_nan;
-      else
-	goto bad;
-    }
-
+    goto bad;
   push_char (dtp, c);
 
   for (;;)
@@ -1177,41 +1166,6 @@ parse_real (st_parameter_dt *dtp, void *
 
   return m;
 
- inf_nan:
-  /* Match INF and Infinity.  */
-  if ((c == 'i' || c == 'I')
-      && ((c = next_char (dtp)) == 'n' || c == 'N')
-      && ((c = next_char (dtp)) == 'f' || c == 'F'))
-    {
-	c = next_char (dtp);
-	if ((c != 'i' && c != 'I')
-	    || ((c == 'i' || c == 'I')
-		&& ((c = next_char (dtp)) == 'n' || c == 'N')
-		&& ((c = next_char (dtp)) == 'i' || c == 'I')
-		&& ((c = next_char (dtp)) == 't' || c == 'T')
-		&& ((c = next_char (dtp)) == 'y' || c == 'Y')
-		&& (c = next_char (dtp))))
-	  {
-	     if (is_separator (c))
-	       unget_char (dtp, c);
-	     push_char (dtp, 'i');
-	     push_char (dtp, 'n');
-	     push_char (dtp, 'f');
-	     goto done;
-	  }
-    } /* Match NaN.  */
-  else if (((c = next_char (dtp)) == 'a' || c == 'A')
-	   && ((c = next_char (dtp)) == 'n' || c == 'N')
-	   && (c = next_char (dtp)))
-    {
-      if (is_separator (c))
-	unget_char (dtp, c);
-      push_char (dtp, 'n');
-      push_char (dtp, 'a');
-      push_char (dtp, 'n');
-      goto done;
-    }
-
  bad:
 
   if (nml_bad_return (dtp, c))
@@ -1339,12 +1293,6 @@ read_real (st_parameter_dt *dtp, int len
       eat_separator (dtp);
       return;
 
-    case 'i':
-    case 'I':
-    case 'n':
-    case 'N':
-      goto inf_nan;
-
     default:
       goto bad_real;
     }
@@ -1419,12 +1367,7 @@ read_real (st_parameter_dt *dtp, int len
     }
 
   if (!isdigit (c) && c != '.')
-    {
-      if (c == 'i' || c == 'I' || c == 'n' || c == 'N')
-	goto inf_nan;
-      else
-	goto bad_real;
-    }
+    goto bad_real;
 
   if (c == '.')
     {
@@ -1521,37 +1464,6 @@ read_real (st_parameter_dt *dtp, int len
   dtp->u.p.saved_type = BT_REAL;
   return;
 
- inf_nan:
-  /* Match INF and Infinity.  */
-  if ((c == 'i' || c == 'I')
-      && ((c = next_char (dtp)) == 'n' || c == 'N')
-      && ((c = next_char (dtp)) == 'f' || c == 'F'))
-    {
-	c = next_char (dtp);
-	if (is_separator (c)
-	    || ((c == 'i' || c == 'I')
-		&& ((c = next_char (dtp)) == 'n' || c == 'N')
-		&& ((c = next_char (dtp)) == 'i' || c == 'I')
-		&& ((c = next_char (dtp)) == 't' || c == 'T')
-		&& ((c = next_char (dtp)) == 'y' || c == 'Y')
-		&& (c = next_char (dtp)) && is_separator (c)))
-	  {
-	     push_char (dtp, 'i');
-	     push_char (dtp, 'n');
-	     push_char (dtp, 'f');
-	     goto done;
-	  }
-    } /* Match NaN.  */
-  else if (((c = next_char (dtp)) == 'a' || c == 'A')
-	   && ((c = next_char (dtp)) == 'n' || c == 'N')
-	   && (c = next_char (dtp)) && is_separator (c))
-    {
-      push_char (dtp, 'n');
-      push_char (dtp, 'a');
-      push_char (dtp, 'n');
-      goto done;
-    }
-
  bad_real:
 
   if (nml_bad_return (dtp, c))
--- gcc/testsuite/gfortran.dg/nan_3.f90	(revision 130708)
+++ gcc/testsuite/gfortran.dg/nan_3.f90	(revision 130707)
@@ -1,45 +0,0 @@
-! { dg-do run }
-! { dg-options "-fno-range-check" }
-! { dg-options "-fno-range-check -mieee" { target sh*-*-* } }
-!
-! PR fortran/34319
-!
-! Check support of INF/NaN for I/O.
-!
-program main
-  implicit none
-  real :: r
-  complex :: z
-  character(len=30) :: str
-
-  str = "nan"
-  read(str,*) r
-  if (.not.isnan(r)) call abort()
-  str = "(nan,4.0)"
-  read(str,*) z
-  if (.not.isnan(real(z)) .or. aimag(z) /= 4.0) call abort()
-  str = "(7.0,nan)"
-  read(str,*) z
-  if (.not.isnan(aimag(z)) .or. real(z) /= 7.0) call abort()
-
-  str = "inFinity"
-  read(str,*) r
-  if (r <= huge(r)) call abort()
-  str = "(+inFinity,4.0)"
-  read(str,*) z
-  if ((real(z) <= huge(r)) .or. aimag(z) /= 4.0) call abort()
-  str = "(7.0,-inFinity)"
-  read(str,*) z
-  if ((aimag(z) >= -huge(r)) .or. real(z) /= 7.0) call abort()
-
-  str = "inf"
-  read(str,*) r
-  if (r <= huge(r)) call abort()
-  str = "(+inf,4.0)"
-  read(str,*) z
-  if ((real(z) <= huge(r)) .or. aimag(z) /= 4.0) call abort()
-  str = "(7.0,-inf)"
-  read(str,*) z
-  if ((aimag(z) >= -huge(r)) .or. real(z) /= 7.0) call abort()
-
-end program main