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! { dg-do run }
!
! PR fortran/43551
!
! Writes a 672000 byte file with buffering. The writing failed because
! of a missing lseek.
implicit none
integer, parameter :: size = 2800 ! << needs to be large enough
real(8) :: vec1(size,30), dummy(size)
integer i
CALL RANDOM_NUMBER(vec1)
open(99, file='test.dat', form='unformatted', access='direct', recl=size*8)
do i = 1, 10
write(99,rec=i) vec1(:,i)
write(99,rec=i+10) vec1(:,i+10)
write(99,rec=i+20) vec1(:,i+20) ! << rec = 30 was written to rec = 21
end do
do i = 1, 10
read(99,rec=i) dummy
if (any (dummy /= vec1(:,i))) call abort()
read(99,rec=i+10) dummy
if (any (dummy /= vec1(:,i+10))) call abort()
read(99,rec=i+20) dummy
if (any (dummy /= vec1(:,i+20))) call abort() ! << aborted here for rec = 21
end do
close(99, status='delete')
end
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