Function: po-find-charset

po-find-charset is a byte-compiled function defined in po.el.gz.

Signature

(po-find-charset FILENAME)

Documentation

Return PO charset value for FILENAME.

If FILENAME is a cons cell, its CDR is a buffer that already contains the PO file (but not yet decoded).

Source Code

;; Defined in /usr/src/emacs/lisp/textmodes/po.el.gz
(defun po-find-charset (filename)
  "Return PO charset value for FILENAME.
If FILENAME is a cons cell, its CDR is a buffer that already contains
the PO file (but not yet decoded)."
  (let ((charset-regexp
	 "^\"Content-Type:[ \t]*text/plain;[ \t]*charset=\\(.*\\)\\\\n\"")
	(buf (and (consp filename) (cdr filename)))
	(short-read nil))
    (when buf
      (set-buffer buf)
      (goto-char (point-min)))
    ;; Try the first 4096 bytes.  In case we cannot find the charset value
    ;; within the first 4096 bytes (the PO file might start with a long
    ;; comment) try the next 4096 bytes repeatedly until we'll know for sure
    ;; we've checked the empty header entry entirely.
    (while (not (or short-read (re-search-forward "^msgid" nil t) buf))
      (save-excursion
        (goto-char (point-max))
	(let ((pair (insert-file-contents-literally filename nil
						    (1- (point))
						    (1- (+ (point) 4096)))))
	  (setq short-read (< (nth 1 pair) 4096)))))
    (cond ((re-search-forward charset-regexp nil t) (match-string 1))
	  ((or short-read buf) nil)
	  ;; We've found the first msgid; maybe, only a part of the msgstr
	  ;; value was loaded.  Load the next 1024 bytes; if charset still
	  ;; isn't available, give up.
	  (t (save-excursion
	       (goto-char (point-max))
	       (insert-file-contents-literally filename nil
					       (1- (point))
					       (1- (+ (point) 1024))))
	     (if (re-search-forward charset-regexp nil t)
		 (match-string 1))))))