Merge pull request #600 from ivan-pi/npy

Fix iomsg allocation in save_npy

src/stdlib_io_npy_save.fypp

@@ -128,7 +128,9 @@ contains
         end if
 
         if (present(iomsg)) then
-            iomsg = "Failed to write array to file '"//filename//"'"
+            if (stat /= 0) then
+                iomsg = "Failed to write array to file '"//filename//"'"
+            end if
         end if
     end subroutine save_npy_${t1[0]}$${k1}$_${rank}$
   #:endfor

src/tests/io/test_npy.f90

@@ -34,7 +34,8 @@ subroutine collect_npy(testsuite)
             new_unittest("duplicate-descr", test_duplicate_descr, should_fail=.true.), &
             new_unittest("missing-descr", test_missing_descr, should_fail=.true.), &
             new_unittest("missing-fortran_order", test_missing_fortran_order, should_fail=.true.), &
-            new_unittest("missing-shape", test_missing_shape, should_fail=.true.) &
+            new_unittest("missing-shape", test_missing_shape, should_fail=.true.), &
+            new_unittest("iomsg-deallocated", test_iomsg_deallocated) &
             ]
     end subroutine collect_npy
 
@@ -619,6 +620,27 @@ subroutine test_missing_shape(error)
         call check(error, stat, msg)
     end subroutine test_missing_shape
 
+    subroutine test_iomsg_deallocated(error)
+        !> Error handling
+        type(error_type), allocatable, intent(out) :: error
+
+        integer :: stat
+        character(len=:), allocatable :: msg
+
+        character(len=*), parameter :: filename = ".test-iomsg-deallocated.npy"
+        real(sp), allocatable :: input(:, :), output(:, :)
+
+        msg = "This message should be deallocated."
+
+        allocate(input(12, 5))
+        call random_number(input)
+        call save_npy(filename, input, stat, msg)
+        call delete_file(filename)
+
+        call check(error,.not. allocated(msg), "Message wrongly allocated.")
+
+    end subroutine
+
     subroutine delete_file(filename)
         character(len=*), intent(in) :: filename