* sprintf.c (rb_str_format): should preserve format encoding

before raising CompatibilityError.  [ruby-list:46274]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24507 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Aug 12 08:39:15 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* sprintf.c (rb_str_format): should preserve format encoding
+	  before raising CompatibilityError.  [ruby-list:46274]
+
 Wed Aug 12 07:41:31 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* encoding.c (rb_enc_compatible): If a string is empty and

sprintf.c

@@ -482,6 +482,10 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
 
 	for (t = p; t < end && *t != '%'; t++) ;
 	PUSH(p, t - p);
+	if (coderange != ENC_CODERANGE_BROKEN && scanned < blen) {
+	    scanned = rb_str_coderange_scan_restartable(buf+scanned, buf+blen, enc, &coderange);
+	    ENC_CODERANGE_SET(result, coderange);
+	}
 	if (t >= end) {
 	    /* end of fmt string */
 	    goto sprint_exit;
@@ -673,7 +677,7 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
 				      (cr == ENC_CODERANGE_UNKNOWN ?
 				       ENC_CODERANGE_BROKEN : (coderange = cr)));
 		}
-		enc = rb_enc_check(result, str);
+		enc = rb_enc_check((RSTRING_LEN(result) == 0 ? fmt : result), str);
 		if (flags&(FPREC|FWIDTH)) {
 		    slen = rb_enc_strlen(RSTRING_PTR(str),RSTRING_END(str),enc);
 		    if (slen < 0) {
@@ -1055,10 +1059,6 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
 	if (RTEST(ruby_debug)) rb_raise(rb_eArgError, "%s", mesg);
 	if (RTEST(ruby_verbose)) rb_warn("%s", mesg);
     }
-    if (scanned < blen) {
-	rb_str_coderange_scan_restartable(buf+scanned, buf+blen, enc, &coderange);
-	ENC_CODERANGE_SET(result, coderange);
-    }
     rb_str_resize(result, blen);
 
     if (tainted) OBJ_TAINT(result);