[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/memccpy.c

@@ -0,0 +1,48 @@
+/***
+*memccpy.c - copy bytes until a character is found
+*
+*       Copyright (c) Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*       defines _memccpy() - copies bytes until a specifed character
+*       is found, or a maximum number of characters have been copied.
+*
+*******************************************************************************/
+
+#include <string.h>
+
+/***
+*char *_memccpy(dest, src, c, count) - copy bytes until character found
+*
+*Purpose:
+*       Copies bytes from src to dest until count bytes have been
+*       copied, or up to and including the character c, whichever
+*       comes first.
+*
+*Entry:
+*       void *dest - pointer to memory to receive copy
+*       void *src  - source of bytes
+*       int  c     - character to stop copy at
+*       size_t count - max number of bytes to copy
+*
+*Exit:
+*       returns pointer to byte immediately after c in dest
+*       returns NULL if c was never found
+*
+*Exceptions:
+*
+*******************************************************************************/
+
+void * __cdecl _memccpy (
+        void * dest,
+        const void * src,
+        int c,
+        size_t count
+        )
+{
+        while ( count && (*((char *)(dest = (char *)dest + 1) - 1) =
+        *((char *)(src = (char *)src + 1) - 1)) != (char)c )
+                count--;
+
+        return(count ? dest : NULL);
+}