[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/mbsnbcmp.cpp

@@ -0,0 +1,107 @@
+/***
+*mbsnbcmp.c - Compare n bytes of two MBCS strings
+*
+*       Copyright (c) Microsoft Corporation.  All rights reserved.
+*
+*Purpose:
+*       Compare n bytes of two MBCS strings
+*
+*******************************************************************************/
+#ifndef _MBCS
+    #error This file should only be compiled with _MBCS defined
+#endif
+
+#include <corecrt_internal_mbstring.h>
+#include <locale.h>
+
+#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
+
+/***
+*int mbsnbcmp(s1, s2, n) - Compare n bytes of two MBCS strings
+*
+*Purpose:
+*       Compares up to n bytes of two strings for ordinal order.
+*
+*       UTF-8 and SBCS are merely compared in byte order.
+*       DBCS are compared by codepoint to ensure double byte chars sort last
+*
+*Entry:
+*       unsigned char *s1, *s2 = strings to compare
+*       size_t n = maximum number of bytes to compare
+*
+*Exit:
+*       Returns <0 if s1 < s2
+*       Returns  0 if s1 == s2
+*       Returns >0 if s1 > s2
+*       Returns _NLSCMPERROR is something went wrong
+*
+*Exceptions:
+*       Input parameters are validated. Refer to the validation section of the function.
+*
+*******************************************************************************/
+
+extern "C" int __cdecl _mbsnbcmp_l(
+        const unsigned char *s1,
+        const unsigned char *s2,
+        size_t n,
+        _locale_t plocinfo
+        )
+{
+        unsigned short c1, c2;
+
+        if (n==0)
+                return(0);
+
+        _LocaleUpdate _loc_update(plocinfo);
+
+        if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
+            return strncmp((const char *)s1, (const char *)s2, n);
+
+        /* validation section */
+        _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR);
+        _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR);
+
+        while (n--) {
+
+            c1 = *s1++;
+            if ( _ismbblead_l(c1, _loc_update.GetLocaleT()) )
+            {
+                if (n==0)
+                {
+                    c1 = 0; /* 'naked' lead - end of string */
+                    c2 = _ismbblead_l(*s2, _loc_update.GetLocaleT()) ? 0 : *s2;
+                    goto test;
+                }
+                c1 = ( (*s1 == '\0') ? 0 : ((c1<<8) | *s1++) );
+            }
+
+            c2 = *s2++;
+            if ( _ismbblead_l(c2, _loc_update.GetLocaleT()) )
+            {
+                if (n==0)
+                {
+                    c2 = 0; /* 'naked' lead - end of string */
+                    goto test;
+                }
+                --n;
+                c2 = ( (*s2 == '\0') ? 0 : ((c2<<8) | *s2++) );
+            }
+test:
+            if (c1 != c2)
+                return( (c1 > c2) ? 1 : -1);
+
+            if (c1 == 0)
+                return(0);
+        }
+
+        return(0);
+}
+
+extern "C" int (__cdecl _mbsnbcmp)(
+        const unsigned char *s1,
+        const unsigned char *s2,
+        size_t n
+        )
+{
+    return _mbsnbcmp_l(s1, s2, n, nullptr);
+}