[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/strncpy.c

@@ -0,0 +1,56 @@
+/***
+*strncpy.c - copy at most n characters of string
+*
+*       Copyright (c) Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*       defines strncpy() - copy at most n characters of string
+*
+*******************************************************************************/
+
+#include <string.h>
+
+#if defined _M_ARM
+    #pragma function(strncpy)
+#endif
+
+/***
+*char *strncpy(dest, source, count) - copy at most n characters
+*
+*Purpose:
+*       Copies count characters from the source string to the
+*       destination.  If count is less than the length of source,
+*       NO NULL CHARACTER is put onto the end of the copied string.
+*       If count is greater than the length of sources, dest is padded
+*       with null characters to length count.
+*
+*
+*Entry:
+*       char *dest - pointer to destination
+*       char *source - source string for copy
+*       unsigned count - max number of characters to copy
+*
+*Exit:
+*       returns dest
+*
+*Exceptions:
+*
+*******************************************************************************/
+
+char * __cdecl strncpy (
+        char * dest,
+        const char * source,
+        size_t count
+        )
+{
+        char *start = dest;
+
+        while (count && (*dest++ = *source++) != '\0')    /* copy string */
+                count--;
+
+        if (count)                              /* pad out with zeroes */
+                while (--count)
+                        *dest++ = '\0';
+
+        return(start);
+}