[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/mbstring/mbsinc.cpp

@@ -0,0 +1,76 @@
+/***
+*mbsinc.c - Move MBCS string pointer ahead one charcter.
+*
+*       Copyright (c) Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*       Move MBCS string pointer ahead one character.
+*
+*******************************************************************************/
+#ifndef _MBCS
+    #error This file should only be compiled with _MBCS defined
+#endif
+
+#include <corecrt_internal.h>
+#include <corecrt_internal_mbstring.h>
+#include <stddef.h>
+
+#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
+
+/***
+*_mbsinc - Move MBCS string pointer ahead one charcter.
+*
+*Purpose:
+*       Move the supplied string pointer ahead by one
+*       character.  MBCS characters are handled correctly.
+*
+*Entry:
+*       const unsigned char *current = current char pointer (legal MBCS boundary)
+*
+*Exit:
+*       Returns pointer after moving it.
+*
+*Exceptions:
+*       Input parameters are validated. Refer to the validation section of the function.
+*
+*******************************************************************************/
+
+extern "C" unsigned char * __cdecl _mbsinc_l(
+        const unsigned char *current,
+        _locale_t plocinfo
+        )
+{
+        if ( (_ismbblead_l)(*(current++),plocinfo))
+        {
+            /* don't move forward two if we get leadbyte, EOS
+               also don't assert here as we are too low level
+            */
+            if(*current!='\0')
+            {
+                current++;
+            }
+        }
+
+        return (unsigned char *)current;
+}
+
+extern "C" unsigned char * (__cdecl _mbsinc)(
+        const unsigned char *current
+        )
+{
+        /* validation section */
+        _VALIDATE_RETURN(current != nullptr, EINVAL, nullptr);
+
+        if ( _ismbblead(*(current++)))
+        {
+            /* don't move forward two if we get leadbyte, EOS
+               also don't assert here as we are too low level
+            */
+            if(*current!='\0')
+            {
+                current++;
+            }
+        }
+
+        return (unsigned char *)current;
+}