develop/open_watcom: Post-SVN tidy

- Move source code from `trunk` into program root directory.
- Update build files.
- Note: Line endings standardised from `CRLF` > `LF`, so best to view diffs with whitespace changes hidden.

programs/develop/open watcom/clib/string/stncpy_s.c

@@ -0,0 +1,81 @@
+/****************************************************************************
+*
+*                            Open Watcom Project
+*
+*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
+*
+*  ========================================================================
+*
+*    This file contains Original Code and/or Modifications of Original
+*    Code as defined in and that are subject to the Sybase Open Watcom
+*    Public License version 1.0 (the 'License'). You may not use this file
+*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
+*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
+*    provided with the Original Code and Modifications, and is also
+*    available at www.sybase.com/developer/opensource.
+*
+*    The Original Code and all software distributed under the License are
+*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
+*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
+*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
+*    NON-INFRINGEMENT. Please see the License for the specific language
+*    governing rights and limitations under the License.
+*
+*  ========================================================================
+*
+* Description:  Implementation of strncpy_s() - bounds-checking strncpy().
+*
+****************************************************************************/
+
+
+#include "variety.h"
+#include "saferlib.h"
+#include "widechar.h"
+#include <string.h>
+#include <wchar.h>
+
+
+_WCRTLINK errno_t __F_NAME(strncpy_s,wcsncpy_s)( CHAR_TYPE * __restrict s1,
+                            rsize_t s1max, const CHAR_TYPE * __restrict s2,
+                            rsize_t n )
+/*************************************************************************/
+{
+    errno_t     rc = -1;
+    const char  *msg;
+
+    // strnlen_s is safe to use as it has no rt constraints
+    rsize_t     s2len = __F_NAME(strnlen_s,wcsnlen_s)( s2, s1max );
+
+    // Verify runtime-constraints
+    // s1 not NULL
+    // s2 not NULL
+    // s1max <= RSIZE_MAX
+    // n     <= RSIZE_MAX
+    // s1max != 0
+    // if n >= s1max then s1max > strnlen_s( s2, s1max )
+    // s1 s2 no overlap
+    if( __check_constraint_nullptr_msg( msg, s1 ) &&
+        __check_constraint_nullptr_msg( msg, s2 ) &&
+        __check_constraint_maxsize_msg( msg, s1max ) &&
+        __check_constraint_maxsize_msg( msg, n ) &&
+        __check_constraint_zero_msg( msg, s1max ) &&
+        ((n < s1max) || __check_constraint_a_gt_b_msg( msg, s2len, s1max - 1 )) &&
+        __check_constraint_overlap_msg( msg, s1, s1max, s2, s2len )) {
+
+         for( ; n; --n) {
+             if( *s2 == '\0' ) break;
+             *s1++ = *s2++;
+         }
+         *s1 = '\0';
+         rc = 0;
+    } else {
+        // Runtime-constraints found, store zero in receiving field
+        if( (s1 != NULL) && (s1max > 0) && __lte_rsizmax( s1max ) ) {
+            s1[0] = '\0';
+        }
+        // Now call the handler
+        __rtct_fail( __func__, msg, NULL );
+    }
+    return( rc );
+}