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+To: vim-dev@vim.org
+Subject: Patch 7.2.245
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.2.245
+Problem: When 'enc' is "utf-16" and 'fenc' is "utf-8" writing a file does
+ conversion while none should be done. (Yukihiro Nakadaira) When
+ 'fenc' is empty the file is written as utf-8 instead of utf-16.
+Solution: Do proper comparison of encodings, taking into account that all
+ Unicode values for 'enc' use utf-8 internally.
+Files: src/fileio.c
+
+
+*** ../vim-7.2.244/src/fileio.c 2009-07-29 18:05:57.000000000 +0200
+--- src/fileio.c 2009-07-29 17:04:06.000000000 +0200
+***************
+*** 134,140 ****
+ #ifdef FEAT_MBYTE
+ static linenr_T readfile_linenr __ARGS((linenr_T linecnt, char_u *p, char_u *endp));
+ static int ucs2bytes __ARGS((unsigned c, char_u **pp, int flags));
+! static int same_encoding __ARGS((char_u *a, char_u *b));
+ static int get_fio_flags __ARGS((char_u *ptr));
+ static char_u *check_for_bom __ARGS((char_u *p, long size, int *lenp, int flags));
+ static int make_bom __ARGS((char_u *buf, char_u *name));
+--- 134,140 ----
+ #ifdef FEAT_MBYTE
+ static linenr_T readfile_linenr __ARGS((linenr_T linecnt, char_u *p, char_u *endp));
+ static int ucs2bytes __ARGS((unsigned c, char_u **pp, int flags));
+! static int need_conversion __ARGS((char_u *fenc));
+ static int get_fio_flags __ARGS((char_u *ptr));
+ static char_u *check_for_bom __ARGS((char_u *p, long size, int *lenp, int flags));
+ static int make_bom __ARGS((char_u *buf, char_u *name));
+***************
+*** 1043,1055 ****
+ }
+
+ /*
+! * Conversion is required when the encoding of the file is different
+! * from 'encoding' or 'encoding' is UTF-16, UCS-2 or UCS-4 (requires
+! * conversion to UTF-8).
+ */
+ fio_flags = 0;
+! converted = (*fenc != NUL && !same_encoding(p_enc, fenc));
+! if (converted || enc_unicode != 0)
+ {
+
+ /* "ucs-bom" means we need to check the first bytes of the file
+--- 1043,1054 ----
+ }
+
+ /*
+! * Conversion may be required when the encoding of the file is different
+! * from 'encoding' or 'encoding' is UTF-16, UCS-2 or UCS-4.
+ */
+ fio_flags = 0;
+! converted = need_conversion(fenc);
+! if (converted)
+ {
+
+ /* "ucs-bom" means we need to check the first bytes of the file
+***************
+*** 3969,3978 ****
+ fenc = buf->b_p_fenc;
+
+ /*
+! * The file needs to be converted when 'fileencoding' is set and
+! * 'fileencoding' differs from 'encoding'.
+ */
+! converted = (*fenc != NUL && !same_encoding(p_enc, fenc));
+
+ /*
+ * Check if UTF-8 to UCS-2/4 or Latin1 conversion needs to be done. Or
+--- 3968,3976 ----
+ fenc = buf->b_p_fenc;
+
+ /*
+! * Check if the file needs to be converted.
+ */
+! converted = need_conversion(fenc);
+
+ /*
+ * Check if UTF-8 to UCS-2/4 or Latin1 conversion needs to be done. Or
+***************
+*** 5502,5521 ****
+ }
+
+ /*
+! * Return TRUE if "a" and "b" are the same 'encoding'.
+! * Ignores difference between "ansi" and "latin1", "ucs-4" and "ucs-4be", etc.
+ */
+ static int
+! same_encoding(a, b)
+! char_u *a;
+! char_u *b;
+ {
+! int f;
+
+! if (STRCMP(a, b) == 0)
+! return TRUE;
+! f = get_fio_flags(a);
+! return (f != 0 && get_fio_flags(b) == f);
+ }
+
+ /*
+--- 5500,5536 ----
+ }
+
+ /*
+! * Return TRUE if file encoding "fenc" requires conversion from or to
+! * 'encoding'.
+ */
+ static int
+! need_conversion(fenc)
+! char_u *fenc;
+ {
+! int same_encoding;
+! int enc_flags;
+! int fenc_flags;
+
+! if (*fenc == NUL || STRCMP(p_enc, fenc) == 0)
+! same_encoding = TRUE;
+! else
+! {
+! /* Ignore difference between "ansi" and "latin1", "ucs-4" and
+! * "ucs-4be", etc. */
+! enc_flags = get_fio_flags(p_enc);
+! fenc_flags = get_fio_flags(fenc);
+! same_encoding = (enc_flags != 0 && fenc_flags == enc_flags);
+! }
+! if (same_encoding)
+! {
+! /* Specified encoding matches with 'encoding'. This requires
+! * conversion when 'encoding' is Unicode but not UTF-8. */
+! return enc_unicode != 0;
+! }
+!
+! /* Encodings differ. However, conversion is not needed when 'enc' is any
+! * Unicode encoding and the file is UTF-8. */
+! return !(enc_utf8 && fenc_flags == FIO_UTF8);
+ }
+
+ /*
+*** ../vim-7.2.244/src/version.c 2009-07-29 18:05:57.000000000 +0200
+--- src/version.c 2009-07-29 18:20:08.000000000 +0200
+***************
+*** 678,679 ****
+--- 678,681 ----
+ { /* Add new patch number below this line */
++ /**/
++ 245,
+ /**/
+
+--
+An actual excerpt from a classified section of a city newspaper:
+"Illiterate? Write today for free help!"
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\
+/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\ download, build and distribute -- http://www.A-A-P.org ///
+ \\\ help me help AIDS victims -- http://ICCF-Holland.org ///