1 files changed, 52 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/fseek.f90 b/gcc/testsuite/gfortran.dg/fseek.f90
new file mode 100644
index 000000000..9e3c7195a
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/fseek.f90
@@ -0,0 +1,52 @@
+! { dg-do run }
+
+PROGRAM test_fseek
+  INTEGER, PARAMETER :: SEEK_SET = 0, SEEK_CUR = 1, SEEK_END = 2, fd=10
+  INTEGER :: ierr = 0
+  INTEGER :: newline_length
+
+  ! We first need to determine if a newline is one or two characters
+  open (911,status="scratch")
+  write(911,"()")
+  newline_length = ftell(911)
+  close (911)
+  if (newline_length < 1 .or. newline_length > 2) call abort()
+
+  open(fd, status="scratch")
+  ! expected position: one leading blank + 10 + newline
+  WRITE(fd, *) "1234567890"
+  IF (FTELL(fd) /= 11 + newline_length) CALL abort()
+
+  ! move backward from current position
+  CALL FSEEK(fd, -11 - newline_length, SEEK_CUR, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= 0) CALL abort()
+
+  ! move to negative position (error)
+  CALL FSEEK(fd, -1, SEEK_SET, ierr)
+  IF (ierr == 0 .OR. FTELL(fd) /= 0) CALL abort()
+
+  ! move forward from end (11 + 10 + newline)
+  CALL FSEEK(fd, 10, SEEK_END, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= 21 + newline_length) CALL abort()
+
+  ! set position (0)
+  CALL FSEEK(fd, 0, SEEK_SET, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= 0) CALL abort()
+
+  ! move forward from current position
+  CALL FSEEK(fd, 5, SEEK_CUR, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= 5) CALL abort()
+
+  CALL FSEEK(fd, HUGE(0_1), SEEK_SET, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= HUGE(0_1)) CALL abort()
+
+  CALL FSEEK(fd, HUGE(0_2), SEEK_SET, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= HUGE(0_2)) CALL abort()
+
+  CALL FSEEK(fd, HUGE(0_4), SEEK_SET, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= HUGE(0_4)) CALL abort()
+  
+  CALL FSEEK(fd, -HUGE(0_4), SEEK_CUR, ierr)
+  IF (ierr /= 0 .OR. FTELL(fd) /= 0) CALL abort()
+END PROGRAM
+