src/cold/read-from-file.lisp

   1 ;;;; This software is part of the SBCL system. See the README file for
   2 ;;;; more information.
   3 ;;;;
   4 ;;;; This software is derived from the CMU CL system, which was
   5 ;;;; written at Carnegie Mellon University and released into the
   6 ;;;; public domain. The software is in the public domain and is
   7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
   8 ;;;; files for more information.
   9
  10 (in-package "SB-COLD")
  11
  12 ;;; Return an expression read from the file named PATHNAME-DESIGNATOR.
  13 (export 'read-from-file)
  14 (defun read-from-file (pathname-designator)
  15   (with-open-file (s pathname-designator)
  16     (let* ((result (read s))
  17            (eof-result (cons nil nil))
  18            (after-result (read s nil eof-result)))
  19       (unless (eq after-result eof-result)
  20         (error "more than one expression in file ~S" pathname-designator))
  21       result)))
  22 (compile 'read-from-file)