[patch, libgfortran] [4.9/5/6/7 Regression] incorrect reading of values from file on Windows

[Jerry DeLisle <jvdelisle@charter.net>]

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Hi all,

The attached simple patch fixes the regression.  The regression results in
failure to read correctly and not know it.  This is due to the unhandled '/r'
being interpreted as a null value.

Regression tested on x86-64-linux. Though originally reported on Windows, it
does effect linux when a user uses a CR-LF combination.

OK for trunk and then backports as I can?  If I hear nothing I will commit
tomorrow as simple patch.

New test case attaced.

Regards,

Jerry

2016-04-18  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/70684
	* io/list_read (check_buffers): Add '\r' to check for end of line.
	factor.

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diff --git a/libgfortran/io/list_read.c b/libgfortran/io/list_read.c
index e24b3922..b8e174c5 100644
--- a/libgfortran/io/list_read.c
+++ b/libgfortran/io/list_read.c
@@ -197,7 +197,7 @@ check_buffers (st_parameter_dt *dtp)
     }
 
 done:
-  dtp->u.p.at_eol = (c == '\n' || c == EOF);
+  dtp->u.p.at_eol = (c == '\n' || c == '\r' || c == EOF);
   return c;
 }
 

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! { dg-do run }
! PR70684 incorrect reading of values from file on Windows 
program test
implicit none
integer,parameter :: isize=12
integer,parameter :: funit=12
integer :: i
character(1), parameter :: cr=char(13)
double precision, dimension(isize) :: a, res
res= (/ 1.0000000000000000, 2.0000000000000000, 3.0000000000000000, &    
        4.0000000000000000, 5.0000000000000000, 6.0000000000000000, &    
        7.0000000000000000, 8.0000000000000000, 9.0000000000000000, &     
        10.000000000000000, 11.000000000000000, 12.000000000000000 /)  
do i=1,isize
 a(i)=dble(i)
enddo
open(funit,status="scratch")
write(funit,'(1x,6(f25.20,'',''),a)') (a(i),i=1,6), cr
write(funit,'(1x,6(f25.20,'',''),a)') (a(i),i=7,12), cr
rewind(funit)
a=0d0
read(funit,*) (a(i),i=1,isize)
close(funit)
if (any(a /= res)) call abort
end