msvcrt: Add _mbsnccnt_l implementation.

dlls/msvcr100/msvcr100.spec

@@ -1150,7 +1150,7 @@
 @ stub _mbsncat_s
 @ stub _mbsncat_s_l
 @ cdecl _mbsnccnt(str long)
-@ stub _mbsnccnt_l
+@ cdecl _mbsnccnt_l(str long ptr)
 @ cdecl _mbsncmp(str str long)
 @ stub _mbsncmp_l
 @ stub _mbsncoll(str str long)

dlls/msvcr110/msvcr110.spec

@@ -1507,7 +1507,7 @@
 @ stub _mbsncat_s
 @ stub _mbsncat_s_l
 @ cdecl _mbsnccnt(str long)
-@ stub _mbsnccnt_l
+@ cdecl _mbsnccnt_l(str long ptr)
 @ cdecl _mbsncmp(str str long)
 @ stub _mbsncmp_l
 @ stub _mbsncoll(str str long)

dlls/msvcr120/msvcr120.spec

@@ -1518,7 +1518,7 @@
 @ stub _mbsncat_s
 @ stub _mbsncat_s_l
 @ cdecl _mbsnccnt(str long)
-@ stub _mbsnccnt_l
+@ cdecl _mbsnccnt_l(str long ptr)
 @ cdecl _mbsncmp(str str long)
 @ stub _mbsncmp_l
 @ stub _mbsncoll(str str long)

dlls/msvcr80/msvcr80.spec

@@ -822,7 +822,7 @@
 @ stub _mbsncat_s
 @ stub _mbsncat_s_l
 @ cdecl _mbsnccnt(str long)
-@ stub _mbsnccnt_l
+@ cdecl _mbsnccnt_l(str long ptr)
 @ cdecl _mbsncmp(str str long)
 @ stub _mbsncmp_l
 @ stub _mbsncoll(str str long)

dlls/msvcr90/msvcr90.spec

@@ -800,7 +800,7 @@
 @ stub _mbsncat_s
 @ stub _mbsncat_s_l
 @ cdecl _mbsnccnt(str long)
-@ stub _mbsnccnt_l
+@ cdecl _mbsnccnt_l(str long ptr)
 @ cdecl _mbsncmp(str str long)
 @ stub _mbsncmp_l
 @ stub _mbsncoll(str str long)

dlls/msvcrt/mbcs.c

@@ -2273,31 +2273,52 @@ unsigned char* CDECL _mbsnset(unsigned char* str, unsigned int c, size_t len)
 }
 
 /*********************************************************************
- *		_mbsnccnt(MSVCRT.@)
+ *		_mbsnccnt_l(MSVCRT.@)
  * 'c' is for 'character'.
  */
-size_t CDECL _mbsnccnt(const unsigned char* str, size_t len)
+size_t CDECL _mbsnccnt_l(const unsigned char* str, size_t len, _locale_t locale)
 {
-  size_t ret;
-  if(get_mbcinfo()->ismbcodepage)
-  {
-    ret=0;
-    while(*str && len-- > 0)
+    size_t ret;
+    pthreadmbcinfo mbcinfo;
+
+    if (!len)
+        return 0;
+    if (!MSVCRT_CHECK_PMT(str))
+        return 0;
+
+    if (locale)
+        mbcinfo = locale->mbcinfo;
+    else
+        mbcinfo = get_mbcinfo();
+
+    if (mbcinfo->ismbcodepage)
     {
-      if(_ismbblead(*str))
-      {
-        if (!len)
-          break;
-        len--;
-        str++;
-      }
-      str++;
-      ret++;
+        ret = 0;
+        while (*str && len-- > 0)
+        {
+            if (_ismbblead_l(*str, locale))
+            {
+                if (!len)
+                    break;
+                len--;
+                str++;
+            }
+            str++;
+            ret++;
+        }
+        return ret;
     }
-    return ret;
-  }
-  ret=u_strlen(str);
-  return min(ret, len); /* ASCII CP */
+    ret = u_strlen(str);
+    return min(ret, len); /* ASCII CP */
+}
+
+/*********************************************************************
+ *		_mbsnccnt(MSVCRT.@)
+ * 'c' is for 'character'.
+ */
+size_t CDECL _mbsnccnt(const unsigned char* str, size_t len)
+{
+    return _mbsnccnt_l(str, len, NULL);
 }
 
 /*********************************************************************

dlls/msvcrt/msvcrt.spec

@@ -771,7 +771,7 @@
 # stub _mbsncat_s(str long str long)
 # stub _mbsncat_s_l(str long str long ptr)
 @ cdecl _mbsnccnt(str long)
-# stub _mbsnccnt_l(str long ptr)
+@ cdecl _mbsnccnt_l(str long ptr)
 @ cdecl _mbsncmp(str str long)
 # stub _mbsncmp_l(str str long ptr)
 @ stub _mbsncoll(str str long)

dlls/ucrtbase/ucrtbase.spec

@@ -666,7 +666,7 @@
 @ stub _mbsncat_s
 @ stub _mbsncat_s_l
 @ cdecl _mbsnccnt(str long)
-@ stub _mbsnccnt_l
+@ cdecl _mbsnccnt_l(str long ptr)
 @ cdecl _mbsncmp(str str long)
 @ stub _mbsncmp_l
 @ stub _mbsncoll(str str long)
@@ -1235,7 +1235,7 @@
 @ stub _o__mbsncat_s
 @ stub _o__mbsncat_s_l
 @ cdecl _o__mbsnccnt(str long) _mbsnccnt
-@ stub _o__mbsnccnt_l
+@ cdecl _o__mbsnccnt_l(str long ptr) _mbsnccnt_l
 @ cdecl _o__mbsncmp(str str long) _mbsncmp
 @ stub _o__mbsncmp_l
 @ stub _o__mbsncoll