Cygwin: add support for GB18030 codeset

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

newlib/libc/locale/locale.c

@@ -65,8 +65,8 @@ build with multibyte support and support for all ISO and Windows Codepage.
 Otherwise all singlebyte charsets are simply mapped to ASCII.  Right now,
 only newlib for Cygwin is built with full charset support by default.
 Under Cygwin, this implementation additionally supports the charsets
-<<"GBK">>, <<"GB2312">>, <<"eucCN">>, <<"eucKR">>, and <<"Big5">>.  Cygwin
-does not support <<"JIS">>.
+<<"GB18030">>, <<"GBK">>, <<"GB2312">>, <<"eucCN">>, <<"eucKR">>, and
+<<"Big5">>.  Cygwin does not support <<"JIS">>.
 
 Cygwin additionally supports locales from the file
 /usr/share/locale/locale.alias.
@@ -823,6 +823,13 @@ restart:
 	  l_wctomb = __gbk_wctomb;
 	  l_mbtowc = __gbk_mbtowc;
 	}
+      else if (!strcasecmp (charset, "GB18030"))
+	{
+	  strcpy (charset, "GB18030");
+	  mbc_max = 4;
+	  l_wctomb = __gb18030_wctomb;
+	  l_mbtowc = __gb18030_mbtowc;
+	}
       else
 #endif /* __CYGWIN__ */
       /* GEORGIAN-PS and the alias without dash */

newlib/libc/stdlib/local.h

@@ -24,6 +24,7 @@ wctomb_p __iso_wctomb (int val);
 wctomb_p __cp_wctomb (int val);
 #ifdef __CYGWIN__
 wctomb_f __gbk_wctomb;
+wctomb_f __gb18030_wctomb;
 wctomb_f __kr_wctomb;
 wctomb_f __big5_wctomb;
 #endif
@@ -45,6 +46,7 @@ mbtowc_p __iso_mbtowc (int val);
 mbtowc_p __cp_mbtowc (int val);
 #ifdef __CYGWIN__
 mbtowc_f __gbk_mbtowc;
+mbtowc_f __gb18030_mbtowc;
 mbtowc_f __kr_mbtowc;
 mbtowc_f __big5_mbtowc;
 #endif

winsup/cygwin/fhandler/proc.cc

@@ -2323,6 +2323,7 @@ format_proc_codesets (void *, char *&destbuf)
 			 "EUC-CN\n"
 			 "EUC-JP\n"
 			 "EUC-KR\n"
+			 "GB18030\n"
 			 "GB2312\n"
 			 "GBK\n"
 			 "GEORGIAN-PS\n"

winsup/cygwin/nlsfuncs.cc

@@ -1578,8 +1578,8 @@ __eval_codepage_from_internal_charset ()
 	  break;
 	}
       break;
-    case 'G': /* GBK/GB2312 */
-      codepage = 936;
+    case 'G': /* GBK/GB2312/GB18030 */
+      codepage = (charset[2] == '1') ? 54936 : 936;
       break;
     case 'I': /* ISO-8859-x */
       codepage = strtoul (charset + 9, NULL, 10) + 28590;

winsup/cygwin/release/3.5.0

@@ -21,3 +21,5 @@ What's new:
   supported codesets and locales for all interested parties.  Locale(1)
   opens these files and uses the info for printing locale info like any
   other process could do.
+
+- Add support for GB18030 codeset.

winsup/cygwin/strfuncs.cc

@@ -245,7 +245,8 @@ mbsnrtowci(wint_t *dst, const char **src, size_t nms, size_t len, mbstate_t *ps)
    eucJP, the both most used Japanese charset encodings, this shouldn't
    be such a big problem. */
 
-/* GBK, eucKR, and Big5 conversions are not available so far in newlib. */
+/* GBK, GB18030, eucKR, and Big5 conversions are not available so far
+   in newlib. */
 
 static int
 __db_wctomb (struct _reent *r, char *s, wchar_t wchar, UINT cp)
@@ -325,6 +326,12 @@ __gbk_wctomb (struct _reent *r, char *s, wchar_t wchar, mbstate_t *state)
   return __db_wctomb (r,s, wchar, 936);
 }
 
+extern "C" int
+__gb18030_wctomb (struct _reent *r, char *s, wchar_t wchar, mbstate_t *state)
+{
+  return __db_wctomb (r,s, wchar, 54936);
+}
+
 extern "C" int
 __kr_wctomb (struct _reent *r, char *s, wchar_t wchar, mbstate_t *state)
 {
@@ -482,6 +489,13 @@ __gbk_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
   return __db_mbtowc (r, pwc, s, n, 936, state);
 }
 
+extern "C" int
+__gb18030_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
+		  mbstate_t *state)
+{
+  return __db_mbtowc (r, pwc, s, n, 54936, state);
+}
+
 extern "C" int
 __kr_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
 	     mbstate_t *state)

winsup/doc/new-features.xml

@@ -41,6 +41,10 @@ files and uses the info for printing locale info like any other process
 could do.
 </para></listitem>
 
+<listitem><para>
+Add support for GB18030 codeset.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>