[w3m-dev 04015] Re: Canna patch and utf-8 related fixes

> > JIS X 0208(0x2141,)UCS0xFF5E(
> > )iconvnkf
> > 0x301C
> 
> CP932 ()
> Shift_JIS(CP932)  EUC-JP( ISO-2022-JP) 

giconvcp932.h

 * 2. Some characters in the JISX0208 range are defined differently:
 *
 *     code   SHIFTJIS.TXT                   CP932.TXT
 *    0x815F  0x005C # REVERSE SOLIDUS       0xFF3C # FULLWIDTH REVERSE SOLIDUS
 *    0x8160  0x301C # WAVE DASH             0xFF5E # FULLWIDTH TILDE
 *    0x8161  0x2016 # DOUBLE VERTICAL LINE  0x2225 # PARALLEL TO
 *    0x817C  0x2212 # MINUS SIGN            0xFF0D # FULLWIDTH HYPHEN-MINUS
 *    0x8191  0x00A2 # CENT SIGN             0xFFE0 # FULLWIDTH CENT SIGN
 *    0x8192  0x00A3 # POUND SIGN            0xFFE1 # FULLWIDTH POUND SIGN
 *    0x81CA  0x00AC # NOT SIGN              0xFFE2 # FULLWIDTH NOT SIGN
 *
 *    We don't implement these changes. SHIFTJIS.TXT makes more sense.

0x815F(0x2140) -> 0xFF3C # FULLWIDTH REVERSE SOLIDUS
0x8160(0x2141) -> 0x301C # WAVE DASH
0x8161(0x2142) -> 0x2016 # DOUBLE VERTICAL LINE
0x817C(0x215D) -> 0x2212 # MINUS SIGN
0x8191(0x2171) -> 0x00A2 # CENT SIGN
0x8192(0x2172) -> 0x00A3 # POUND SIGN
0x81CA(0x224C) -> 0x00AC # NOT SIGN
nkf,NSString(NSShiftJISStringEncoding)
3East Asian Ambiguous
CP932.TXT2
4SHIFTJIS.TXT