To: vim-dev@vim.org
Subject: Patch 7.2.245
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------

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,
  /**/

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 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
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