Patch 7.2.244
Problem:    When 'enc' is utf-8 and 'fenc' is latin1, writing a non-latin1
            character gives a conversion error without any hint what is wrong.
Solution:   When known add the line number to the error message.
Files:      src/fileio.c


*** ../vim-7.2.243/src/fileio.c 2009-07-29 12:09:49.000000000 +0200
--- src/fileio.c        2009-07-29 17:04:06.000000000 +0200
***************
*** 121,126 ****
--- 121,128 ----
      char_u    *bw_conv_buf;   /* buffer for writing converted chars */
      int               bw_conv_buflen; /* size of bw_conv_buf */
      int               bw_conv_error;  /* set for conversion error */
+     linenr_T  bw_conv_error_lnum;  /* first line with error or zero */
+     linenr_T  bw_start_lnum;  /* line number at start of buffer */
  # ifdef USE_ICONV
      iconv_t   bw_iconv_fd;    /* descriptor for iconv() or -1 */
  # endif
***************
*** 2924,2929 ****
--- 2925,2931 ----
      linenr_T      lnum;
      long          nchars;
      char_u        *errmsg = NULL;
+     int                   errmsg_allocated = FALSE;
      char_u        *errnum = NULL;
      char_u        *buffer;
      char_u        smallbuf[SMBUFSIZE];
***************
*** 2987,2992 ****
--- 2989,2995 ----
      /* must init bw_conv_buf and bw_iconv_fd before jumping to "fail" */
      write_info.bw_conv_buf = NULL;
      write_info.bw_conv_error = FALSE;
+     write_info.bw_conv_error_lnum = 0;
      write_info.bw_restlen = 0;
  # ifdef USE_ICONV
      write_info.bw_iconv_fd = (iconv_t)-1;
***************
*** 4243,4248 ****
--- 4245,4251 ----
                nchars += write_info.bw_len;
        }
      }
+     write_info.bw_start_lnum = start;
  #endif
  
      write_info.bw_len = bufsize;
***************
*** 4278,4283 ****
--- 4281,4289 ----
            nchars += bufsize;
            s = buffer;
            len = 0;
+ #ifdef FEAT_MBYTE
+           write_info.bw_start_lnum = lnum;
+ #endif
        }
        /* write failed or last line has no EOL: stop here */
        if (end == 0
***************
*** 4474,4480 ****
        {
  #ifdef FEAT_MBYTE
            if (write_info.bw_conv_error)
!               errmsg = (char_u *)_("E513: write error, conversion failed 
(make 'fenc' empty to override)");
            else
  #endif
                if (got_int)
--- 4480,4496 ----
        {
  #ifdef FEAT_MBYTE
            if (write_info.bw_conv_error)
!           {
!               if (write_info.bw_conv_error_lnum == 0)
!                   errmsg = (char_u *)_("E513: write error, conversion failed 
(make 'fenc' empty to override)");
!               else
!               {
!                   errmsg_allocated = TRUE;
!                   errmsg = alloc(300);
!                   vim_snprintf((char *)errmsg, 300, _("E513: write error, 
conversion failed in line %ld (make 'fenc' empty to override)"),
!                                        (long)write_info.bw_conv_error_lnum);
!               }
!           }
            else
  #endif
                if (got_int)
***************
*** 4550,4555 ****
--- 4566,4577 ----
        {
            STRCAT(IObuff, _(" CONVERSION ERROR"));
            c = TRUE;
+           if (write_info.bw_conv_error_lnum != 0)
+           {
+               int l = STRLEN(IObuff);
+               vim_snprintf((char *)IObuff + l, IOSIZE - l, _(" in line %ld;"),
+                       (long)write_info.bw_conv_error_lnum);
+           }
        }
        else if (notconverted)
        {
***************
*** 4746,4751 ****
--- 4768,4775 ----
        }
        STRCAT(IObuff, errmsg);
        emsg(IObuff);
+       if (errmsg_allocated)
+           vim_free(errmsg);
  
        retval = FAIL;
        if (end == 0)
***************
*** 5105,5111 ****
                        c = buf[wlen];
                }
  
!               ip->bw_conv_error |= ucs2bytes(c, &p, flags);
            }
            if (flags & FIO_LATIN1)
                len = (int)(p - buf);
--- 5129,5141 ----
                        c = buf[wlen];
                }
  
!               if (ucs2bytes(c, &p, flags) && !ip->bw_conv_error)
!               {
!                   ip->bw_conv_error = TRUE;
!                   ip->bw_conv_error_lnum = ip->bw_start_lnum;
!               }
!               if (c == NL)
!                   ++ip->bw_start_lnum;
            }
            if (flags & FIO_LATIN1)
                len = (int)(p - buf);
***************
*** 5386,5391 ****
--- 5416,5422 ----
  #ifdef FEAT_MBYTE
  /*
   * Convert a Unicode character to bytes.
+  * Return TRUE for an error, FALSE when it's OK.
   */
      static int
  ucs2bytes(c, pp, flags)
*** ../vim-7.2.243/src/version.c        2009-07-29 16:13:35.000000000 +0200
--- src/version.c       2009-07-29 18:01:27.000000000 +0200
***************
*** 678,679 ****
--- 678,681 ----
  {   /* Add new patch number below this line */
+ /**/
+     244,
  /**/

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