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[Emacs-diffs] Changes to emacs/lisp/select.el,v
From: |
Jan Djärv |
Subject: |
[Emacs-diffs] Changes to emacs/lisp/select.el,v |
Date: |
Thu, 19 Oct 2006 07:16:09 +0000 |
CVSROOT: /cvsroot/emacs
Module name: emacs
Changes by: Jan Djärv <jhd> 06/10/19 07:16:08
Index: select.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/select.el,v
retrieving revision 1.30
retrieving revision 1.31
diff -u -b -r1.30 -r1.31
--- select.el 16 Sep 2006 17:12:38 -0000 1.30
+++ select.el 19 Oct 2006 07:16:08 -0000 1.31
@@ -152,6 +152,41 @@
;;; Every selection type that Emacs handles is implemented this way, except
;;; for TIMESTAMP, which is a special case.
+(eval-when-compile (require 'ccl))
+
+(define-ccl-program ccl-check-utf-8
+ '(0
+ ((r0 = 1)
+ (loop
+ (read-if (r1 < #x80) (repeat)
+ ((r0 = 0)
+ (if (r1 < #xC2) (end))
+ (read r2)
+ (if ((r2 & #xC0) != #x80) (end))
+ (if (r1 < #xE0) ((r0 = 1) (repeat)))
+ (read r2)
+ (if ((r2 & #xC0) != #x80) (end))
+ (if (r1 < #xF0) ((r0 = 1) (repeat)))
+ (read r2)
+ (if ((r2 & #xC0) != #x80) (end))
+ (if (r1 < #xF8) ((r0 = 1) (repeat)))
+ (read r2)
+ (if ((r2 & #xC0) != #x80) (end))
+ (if (r1 == #xF8) ((r0 = 1) (repeat)))
+ (end))))))
+ "Check if the input unibyte string is a valid UTF-8 sequence or not.
+If it is valid, set the register `r0' to 1, else set it to 0.")
+
+(defun string-utf-8-p (string)
+ "Return non-nil iff STRING is a unibyte string of valid UTF-8 sequence."
+ (if (or (not (stringp string))
+ (multibyte-string-p string))
+ (error "Not a unibyte string: %s" string))
+ (let ((status (make-vector 9 0)))
+ (ccl-execute-on-string ccl-check-utf-8 status string)
+ (= (aref status 0) 1)))
+
+
(defun xselect-convert-to-string (selection type value)
(let (str coding)
;; Get the actual string from VALUE.
@@ -223,11 +258,10 @@
(setq str (encode-coding-string str coding))))
((eq type 'UTF8_STRING)
- (let ((charsets (find-charset-string str)))
- (if (or (memq 'eight-bit-control charsets)
- (memq 'eight-bit-graphic charsets))
- (setq type 'STRING)
- (setq str (encode-coding-string str 'utf-8)))))
+ (if (multibyte-string-p str)
+ (setq str (encode-coding-string str 'utf-8)))
+ (if (not (string-utf-8-p str))
+ (setq str nil))) ;; Decline request as we don't have UTF-8 data.
(t
(error "Unknow selection type: %S" type))
)))
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