[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/mbslwr.cpp

@@ -0,0 +1,136 @@
+/***
+*mbslwr.c - Convert string lower case (MBCS)
+*
+*       Copyright (c) Microsoft Corporation.  All rights reserved.
+*
+*Purpose:
+*       Convert string lower case (MBCS)
+*
+*******************************************************************************/
+#ifndef _MBCS
+    #error This file should only be compiled with _MBCS defined
+#endif
+
+#include <corecrt_internal.h>
+#include <corecrt_internal_mbstring.h>
+#include <corecrt_internal_securecrt.h>
+#include <locale.h>
+#include <string.h>
+
+#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
+
+/***
+* _mbslwr - Convert string lower case (MBCS)
+*
+*Purpose:
+*       Convrts all the upper case characters in a string
+*       to lower case in place.  MBCS chars are handled
+*       correctly.
+*
+*Entry:
+*       unsigned char *string = pointer to string
+*
+*Exit:
+*       Returns a pointer to the input string.
+*       Returns nullptr on error.
+*
+*Exceptions:
+*       Input parameters are validated. Refer to the validation section of the function.
+*
+*******************************************************************************/
+
+errno_t __cdecl _mbslwr_s_l(
+        unsigned char *string,
+        size_t sizeInBytes,
+        _locale_t plocinfo
+        )
+{
+        size_t stringlen;
+
+        /* validation section */
+        _VALIDATE_RETURN_ERRCODE((string != nullptr && sizeInBytes > 0) || (string == nullptr && sizeInBytes == 0), EINVAL);
+
+        if (string == nullptr)
+        {
+            /* nothing to do */
+            return 0;
+        }
+
+        stringlen = strnlen((char *)string, sizeInBytes);
+        if (stringlen >= sizeInBytes)
+        {
+            _RESET_STRING(string, sizeInBytes);
+            _RETURN_DEST_NOT_NULL_TERMINATED(string, sizeInBytes);
+        }
+        _FILL_STRING(string, sizeInBytes, stringlen + 1);
+
+        unsigned char *cp, *dst;
+        _LocaleUpdate _loc_update(plocinfo);
+
+        for (cp = string, dst = string; *cp != '\0'; ++cp)
+        {
+            if (_ismbblead_l(*cp, _loc_update.GetLocaleT()))
+            {
+
+
+                int retval;
+                unsigned char ret[4];
+                if ((retval = __acrt_LCMapStringA(
+                                _loc_update.GetLocaleT(),
+                                _loc_update.GetLocaleT()->mbcinfo->mblocalename,
+                                LCMAP_LOWERCASE,
+                                (const char *)cp,
+                                2,
+                                (char *)ret,
+                                2,
+                                _loc_update.GetLocaleT()->mbcinfo->mbcodepage,
+                                TRUE )) == 0 )
+                {
+                    errno = EILSEQ;
+                    _RESET_STRING(string, sizeInBytes);
+                    return errno;
+                }
+
+                *(dst++) = ret[0];
+                ++cp;
+                if (retval > 1)
+                {
+                    *(dst++) = ret[1];
+                }
+
+
+            }
+            else
+            {
+                /* single byte, macro version */
+                *(dst++) = (unsigned char) _mbbtolower_l(*cp, _loc_update.GetLocaleT());
+            }
+        }
+        /* null terminate the string */
+        *dst = '\0';
+
+        return 0;
+}
+
+errno_t (__cdecl _mbslwr_s)(
+        unsigned char *string,
+        size_t sizeInBytes
+        )
+{
+    return _mbslwr_s_l(string, sizeInBytes, nullptr);
+}
+
+unsigned char * (__cdecl _mbslwr_l)(
+        unsigned char *string,
+        _locale_t plocinfo
+        )
+{
+    return (_mbslwr_s_l(string, (string == nullptr ? 0 : (size_t)-1), plocinfo) == 0 ? string : nullptr);
+}
+
+unsigned char * (__cdecl _mbslwr)(
+        unsigned char *string
+        )
+{
+    return (_mbslwr_s_l(string, (string == nullptr ? 0 : (size_t)-1), nullptr) == 0 ? string : nullptr);
+}