msvcrt: Implement _mbcjmstojis.

dlls/msvcrt/mbcs.c

@@ -474,7 +474,23 @@ unsigned int CDECL _mbcjmstojis(unsigned int c)
      In all other cases, c is returned unchanged */
   if(get_mbcinfo()->mbcodepage == 932)
   {
-    FIXME("(%x): stub\n", c);
+    if(_ismbclegal(c) && HIBYTE(c) < 0xf0)
+    {
+      if(HIBYTE(c) >= 0xe0)
+        c -= 0x4000;
+
+      c = (((HIBYTE(c) - 0x81)*2 + 0x21) << 8) | LOBYTE(c);
+
+      if(LOBYTE(c) > 0x7f)
+        c -= 0x1;
+
+      if(LOBYTE(c) > 0x9d)
+        c += 0x83;
+      else
+        c -= 0x1f;
+    }
+    else
+      return 0; /* Codepage is 932, but c can't be converted */
   }
 
   return c;

dlls/msvcrt/msvcrt.h

@@ -913,6 +913,7 @@ int _setmbcp_l(int, LCID, MSVCRT_pthreadmbcinfo) DECLSPEC_HIDDEN;
 int            __cdecl MSVCRT__write(int,const void*,unsigned int);
 int            __cdecl _getch(void);
 int            __cdecl _ismbblead(unsigned int);
+int            __cdecl _ismbclegal(unsigned int c);
 int            __cdecl _ismbstrail(const unsigned char* start, const unsigned char* str);
 MSVCRT_size_t  __cdecl MSVCRT_mbstowcs(MSVCRT_wchar_t*,const char*,MSVCRT_size_t);
 MSVCRT_intptr_t __cdecl MSVCRT__spawnve(int,const char*,const char* const *,const char* const *);

dlls/msvcrt/tests/string.c

@@ -901,12 +901,8 @@ static void test_mbcjmsjis(void)
             unsigned int ret, exp;
             ret = _mbcjmstojis(jmsjis[j][0]);
             exp = (cp[i] == 932) ? jmsjis[j][1] : jmsjis[j][0];
-            if (cp[i] == 932)
-                todo_wine ok(ret == exp, "Expected 0x%x, got 0x%x (0x%x, codepage=%d)\n",
-                   exp, ret, jmsjis[j][0], cp[i]);
-            else
-                ok(ret == exp, "Expected 0x%x, got 0x%x (0x%x, codepage=%d)\n",
-                   exp, ret, jmsjis[j][0], cp[i]);
+            ok(ret == exp, "Expected 0x%x, got 0x%x (0x%x, codepage=%d)\n",
+               exp, ret, jmsjis[j][0], cp[i]);
         }
     }
     _setmbcp(prev_cp);