4.3BSD - /usr/src/usr.lib/libU77/test/gpctst.f

   1:         integer getc, putc, fgetc, fputc, oer
   2:         character c
   3:         open(1,status='s')
   4:         write(*,*) "Go"
   5:    10   ier = getc(c)
   6:         if (ier .eq. 0) then
   7:           oer = fputc(1,c)
   8:           goto 10
   9:         else
  10:           call perror("end of getc/fputc test")
  11:           write(*,*) "ier=", ier, "oer=", oer
  12:         endif
  13: 
  14:         rewind 1
  15:         write(*,*) "Go"
  16:    20   ier = fgetc(1, c)
  17:         if (ier .eq. 0) then
  18:           oer = putc(c)
  19:           goto 20
  20:         else
  21:           call perror("end of fgetc/putc test")
  22:           write(*,*) "ier=", ier, "oer=", oer
  23:         endif
  24:         end