gcc/testsuite/gfortran.dg/fseek.f90

   1 ! { dg-do run }
   2
   3 PROGRAM test_fseek
   4   INTEGER, PARAMETER :: SEEK_SET = 0, SEEK_CUR = 1, SEEK_END = 2, fd=10
   5   INTEGER :: ierr = 0
   6   INTEGER :: newline_length
   7
   8   ! We first need to determine if a newline is one or two characters
   9   open (911,status="scratch")
  10   write(911,"()")
  11   newline_length = ftell(911)
  12   close (911)
  13   if (newline_length < 1 .or. newline_length > 2) call abort()
  14
  15   open(fd, status="scratch")
  16   ! expected position: one leading blank + 10 + newline
  17   WRITE(fd, *) "1234567890"
  18   IF (FTELL(fd) /= 11 + newline_length) CALL abort()
  19
  20   ! move backward from current position
  21   CALL FSEEK(fd, -11 - newline_length, SEEK_CUR, ierr)
  22   IF (ierr /= 0 .OR. FTELL(fd) /= 0) CALL abort()
  23
  24   ! move to negative position (error)
  25   CALL FSEEK(fd, -1, SEEK_SET, ierr)
  26   IF (ierr == 0 .OR. FTELL(fd) /= 0) CALL abort()
  27
  28   ! move forward from end (11 + 10 + newline)
  29   CALL FSEEK(fd, 10, SEEK_END, ierr)
  30   IF (ierr /= 0 .OR. FTELL(fd) /= 21 + newline_length) CALL abort()
  31
  32   ! set position (0)
  33   CALL FSEEK(fd, 0, SEEK_SET, ierr)
  34   IF (ierr /= 0 .OR. FTELL(fd) /= 0) CALL abort()
  35
  36   ! move forward from current position
  37   CALL FSEEK(fd, 5, SEEK_CUR, ierr)
  38   IF (ierr /= 0 .OR. FTELL(fd) /= 5) CALL abort()
  39
  40   CALL FSEEK(fd, HUGE(0_1), SEEK_SET, ierr)
  41   IF (ierr /= 0 .OR. FTELL(fd) /= HUGE(0_1)) CALL abort()
  42
  43   CALL FSEEK(fd, HUGE(0_2), SEEK_SET, ierr)
  44   IF (ierr /= 0 .OR. FTELL(fd) /= HUGE(0_2)) CALL abort()
  45
  46   CALL FSEEK(fd, HUGE(0_4), SEEK_SET, ierr)
  47   IF (ierr /= 0 .OR. FTELL(fd) /= HUGE(0_4)) CALL abort()
  48
  49   CALL FSEEK(fd, -HUGE(0_4), SEEK_CUR, ierr)
  50   IF (ierr /= 0 .OR. FTELL(fd) /= 0) CALL abort()
  51 END PROGRAM
  52