;; This file serves Emacs version dependent definitions

(if (and (fboundp 'set-buffer-multibyte)
	 (subrp (symbol-function 'set-buffer-multibyte)))
    ;; Emacs 20.3
    (progn
      (defun egg-char-bytes (x) 1)
      (defun egg-charset-bytes (x) 1)
      (defun egg-char-bytes-at (str pos) 1)
      (defun egg-chars-in-period (str pos len) len)
      (defalias 'egg-string-to-vector 'identity)
      (defalias 'egg-string-to-char-at 'aref)
      )
  ;; Emacs 20.2
  (defun set-buffer-multibyte (flag)
    (setq enable-multibyte-characters flag))
  (defalias 'string-as-unibyte 'identity)
  (defalias 'string-as-multibyte 'identity)
  (defalias 'coding-system-put 'put)

  (defalias 'egg-char-bytes 'char-bytes)
  (defalias 'egg-charset-bytes 'charset-bytes)
  (defun egg-char-bytes-at (str pos)
    (char-bytes (egg-string-to-char-at str pos)))
  (defun egg-chars-in-period (str pos len)
    (chars-in-string (substring str pos (+ pos len))))
  (defalias 'egg-string-to-vector 'string-to-vector)
  (defun egg-string-to-char-at (str pos)
    (let ((c (aref str pos)))
      (if (or (< c ?\200)
	      (>= c ?\240)
	      (>= (1+ pos) (length str))
	      (< (aref str (1+ pos)) ?\240))
	  c
	(string-match "[\240-\377]+" str (1+ pos))
	(string-to-char (substring str pos (match-end 0))))))
  )

;; Elisp bug fix

(defun egg-next-single-property-change (pos prop &optional object limit)
  (min limit (next-single-property-change pos prop object (1+ limit))))

(provide 'egg-edep)