[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/string/memicmp.cpp

@@ -0,0 +1,120 @@
+/***
+*memicmp.cpp - compare memory, ignore case
+*
+*       Copyright (c) Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*       defines _memicmp() - compare two blocks of memory for ordinal
+*       order.  Case is ignored in the comparison.
+*
+*******************************************************************************/
+#include <corecrt_internal.h>
+#include <ctype.h>
+#include <locale.h>
+#include <string.h>
+
+/***
+*int _memicmp(lhs, rhs, count) - compare two blocks of memory, ignore case
+*
+*Purpose:
+*       Compares count bytes of the two blocks of memory stored at lhs
+*       and rhs.  The characters are converted to lowercase before
+*       comparing (not permanently), so case is ignored in the search.
+*
+*Entry:
+*       char *lhs, *rhs - memory buffers to compare
+*       size_t count - maximum length to compare
+*
+*Exit:
+*       Returns < 0 if lhs < rhs
+*       Returns 0 if lhs == rhs
+*       Returns > 0 if lhs > rhs
+*       Returns _NLSCMPERROR if something went wrong
+*
+*Uses:
+*
+*Exceptions:
+*       Input parameters are validated. Refer to the validation section of the function.
+*
+*******************************************************************************/
+
+extern "C" int __cdecl _memicmp_l (
+        void const * const lhs,
+        void const * const rhs,
+        size_t       const count,
+        _locale_t    const plocinfo
+        )
+{
+    /* validation section */
+    _VALIDATE_RETURN(lhs != nullptr || count == 0, EINVAL, _NLSCMPERROR);
+    _VALIDATE_RETURN(rhs != nullptr || count == 0, EINVAL, _NLSCMPERROR);
+
+    if (count == 0)
+    {
+        return 0;
+    }
+
+    unsigned char const * lhs_ptr = static_cast<unsigned char const *>(lhs);
+    unsigned char const * rhs_ptr = static_cast<unsigned char const *>(rhs);
+
+    _LocaleUpdate _loc_update(plocinfo);
+
+    int result;
+    size_t remaining = count;
+    do
+    {
+        result = _tolower_fast_internal(*lhs_ptr++, _loc_update.GetLocaleT())
+            - _tolower_fast_internal(*rhs_ptr++, _loc_update.GetLocaleT());
+    }
+    while (result == 0 && --remaining != 0);
+
+    return result;
+}
+
+
+#if !defined(_M_IX86) || defined(_M_HYBRID_X86_ARM64)
+
+extern "C" int __cdecl __ascii_memicmp (
+        void const * const lhs,
+        void const * const rhs,
+        size_t       const count
+        )
+{
+    if (count == 0)
+    {
+        return 0;
+    }
+
+    unsigned char const * lhs_ptr = static_cast<unsigned char const *>(lhs);
+    unsigned char const * rhs_ptr = static_cast<unsigned char const *>(rhs);
+
+    int result;
+    size_t remaining = count;
+    do
+    {
+        result = __ascii_tolower(*lhs_ptr++) - __ascii_tolower(*rhs_ptr++);
+    }
+    while (result == 0 && --remaining != 0);
+
+    return result;
+}
+
+#endif  /* !_M_IX86 || _M_HYBRID_X86_ARM64 */
+
+extern "C" int __cdecl _memicmp (
+        void const * const lhs,
+        void const * const rhs,
+        size_t       const count
+        )
+{
+    if (!__acrt_locale_changed())
+    {
+        /* validation section */
+        _VALIDATE_RETURN(lhs != nullptr || count == 0, EINVAL, _NLSCMPERROR);
+        _VALIDATE_RETURN(rhs != nullptr || count == 0, EINVAL, _NLSCMPERROR);
+
+        return __ascii_memicmp(lhs, rhs, count);
+    }
+
+    return _memicmp_l(lhs, rhs, count, nullptr);
+}