Yuri, Zhihao,

this commit totally broke Russian input for me in nvi. After
exiting edit mode, nvi immediately converts all text to ???????.

I don't have any special settings in my environment. All I have
is "russian" class for my user which yields in these environment
variables:

declare -x LANG="ru_RU.UTF-8"
declare -x MM_CHARSET="UTF-8"
declare -x XTERM_LOCALE="ru_RU.UTF-8"

I'm already digging into that problem, but may be you have
a clue immediately.

On Sat, Jun 13, 2020 at 02:11:02PM +0000, Yuri Pankov wrote:
Y> Author: yuripv
Y> Date: Sat Jun 13 14:11:02 2020
Y> New Revision: 362148
Y> URL: https://svnweb.freebsd.org/changeset/base/362148
Y> 
Y> Log:
Y>   nvi: fallback to ISO8859-1 as last resort
Y>   
Y>   Current logic of using user's locale encoding that is UTF-8 doesn't make
Y>   much sense if we already failed the looks_utf8() check and skipped
Y>   encoding set using "fileencoding" as being UTF-8 as well; fallback to
Y>   ISO8859-1 in that case.
Y>   
Y>   Reviewed by:       Zhihao Yuan <lich...@gmail.com>
Y>   Differential Revision:     https://reviews.freebsd.org/D24919
Y> 
Y> Modified:
Y>   head/contrib/nvi/common/exf.c
Y> 
Y> Modified: head/contrib/nvi/common/exf.c
Y> 
==============================================================================
Y> --- head/contrib/nvi/common/exf.c    Sat Jun 13 09:16:07 2020        
(r362147)
Y> +++ head/contrib/nvi/common/exf.c    Sat Jun 13 14:11:02 2020        
(r362148)
Y> @@ -1237,7 +1237,10 @@ file_encinit(SCR *sp)
Y>      }
Y>  
Y>      /*
Y> -     * Detect UTF-8 and fallback to the locale/preset encoding.
Y> +     * 1. Check for valid UTF-8.
Y> +     * 2. Check if fallback fileencoding is set and is NOT UTF-8.
Y> +     * 3. Check if user locale's encoding is NOT UTF-8.
Y> +     * 4. Use ISO8859-1 as last resort.
Y>       *
Y>       * XXX
Y>       * A manually set O_FILEENCODING indicates the "fallback
Y> @@ -1246,9 +1249,13 @@ file_encinit(SCR *sp)
Y>       */
Y>      if (looks_utf8(buf, blen) > 1)
Y>              o_set(sp, O_FILEENCODING, OS_STRDUP, "utf-8", 0);
Y> -    else if (!O_ISSET(sp, O_FILEENCODING) ||
Y> -        !strcasecmp(O_STR(sp, O_FILEENCODING), "utf-8"))
Y> +    else if (O_ISSET(sp, O_FILEENCODING) &&
Y> +        strcasecmp(O_STR(sp, O_FILEENCODING), "utf-8") != 0)
Y> +            /* Use fileencoding as is */ ;
Y> +    else if (strcasecmp(codeset(), "utf-8") != 0)
Y>              o_set(sp, O_FILEENCODING, OS_STRDUP, codeset(), 0);
Y> +    else
Y> +            o_set(sp, O_FILEENCODING, OS_STRDUP, "iso8859-1", 0);
Y>  
Y>      conv_enc(sp, O_FILEENCODING, 0);
Y>  #endif
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-- 
Gleb Smirnoff
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