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! { dg-do run { target fd_truncate } }
! PR31052 Bad IOSTAT values when readings NAMELISTs past EOF.
! Patch derived from PR, submitted by Jerry DeLisle <jvdelisle@gcc.gnu.org>
program gfcbug61
implicit none
integer :: stat
open (12, status="scratch")
write (12, '(a)')"!================"
write (12, '(a)')"! Namelist REPORT"
write (12, '(a)')"!================"
write (12, '(a)')" &REPORT type = 'SYNOP' "
write (12, '(a)')" use = 'active'"
write (12, '(a)')" max_proc = 20"
write (12, '(a)')" /"
write (12, '(a)')"! Other namelists..."
write (12, '(a)')" &OTHER i = 1 /"
rewind (12)
! Read /REPORT/ the first time
rewind (12)
call position_nml (12, "REPORT", stat)
if (stat.ne.0) call abort()
if (stat == 0) call read_report (12, stat)
! Comment out the following lines to hide the bug
rewind (12)
call position_nml (12, "MISSING", stat)
if (stat.ne.-1) call abort ()
! Read /REPORT/ again
rewind (12)
call position_nml (12, "REPORT", stat)
if (stat.ne.0) call abort()
contains
subroutine position_nml (unit, name, status)
! Check for presence of namelist 'name'
integer :: unit, status
character(len=*), intent(in) :: name
character(len=255) :: line
integer :: ios, idx
logical :: first
first = .true.
status = 0
ios = 0
line = ""
do
read (unit,'(a)',iostat=ios) line
if (first) then
first = .false.
end if
if (ios < 0) then
! EOF encountered!
backspace (unit)
status = -1
return
else if (ios > 0) then
! Error encountered!
status = +1
return
end if
idx = index (line, "&"//trim (name))
if (idx > 0) then
backspace (unit)
return
end if
end do
end subroutine position_nml
subroutine read_report (unit, status)
integer :: unit, status
integer :: iuse, ios
!------------------
! Namelist 'REPORT'
!------------------
character(len=12) :: type, use
integer :: max_proc
namelist /REPORT/ type, use, max_proc
!-------------------------------------
! Loop to read namelist multiple times
!-------------------------------------
iuse = 0
do
!----------------------------------------
! Preset namelist variables with defaults
!----------------------------------------
type = ''
use = ''
max_proc = -1
!--------------
! Read namelist
!--------------
read (unit, nml=REPORT, iostat=ios)
if (ios /= 0) exit
iuse = iuse + 1
end do
if (iuse.ne.1) call abort()
status = ios
end subroutine read_report
end program gfcbug61
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