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/fstrstr.c

@@ -0,0 +1,93 @@
+/****************************************************************************
+*
+*                            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:  _fstrstr() implementation.
+*
+****************************************************************************/
+
+
+#include "variety.h"
+#include <stddef.h>
+#include <string.h>
+
+#ifdef M_I86
+#if defined(__QNX__)
+#include <i86.h>
+#else
+#include <dos.h>
+#endif
+
+extern  int     i86_memeq( const char _WCFAR *, const char _WCFAR *, int );
+
+#define _ZFLAG          (INTR_ZF<<8)
+
+#pragma aux     i86_memeq = \
+        0x1e            /* push ds */\
+        0x96            /* xchg si,ax */\
+        0x8e 0xd8       /* mov ds,ax  */\
+        0xf3 0xa6       /* rep cmpsb */\
+        0x9f            /* lahf */\
+        0x1f            /* pop ds */\
+        parm caller     [si ax] [es di] [cx]\
+        value           [ax] \
+        modify exact    [si di cx ax];
+
+#define memeq( p1, p2, len )    ( i86_memeq((p1),(p2),(len)) & _ZFLAG )
+
+#else
+
+#define memeq( p1, p2, len )    ( _fmemcmp((p1),(p2),(len)) == 0 )
+
+#endif
+
+/* Locate the first occurrence of the string pointed to by s2 in the
+   string pointed to by s1.
+   The strstr function returns a pointer to the located string, or a
+   null pointer if the string is not found.
+*/
+
+_WCRTLINK char _WCFAR *_fstrstr( const char _WCFAR *s1, const char _WCFAR *s2 )
+    {
+        char _WCFAR *end_of_s1;
+        size_t s1len, s2len;
+
+        if( s2[0] == '\0' ) {
+            return( (char _WCFAR *)s1 );
+        } else if( s2[1] == '\0' ) {
+            return( _fstrchr( s1, s2[0] ) );
+        }
+        end_of_s1 = _fmemchr( s1, '\0', ~0u );
+        s2len = _fstrlen( s2 );
+        for(;;) {
+            s1len = end_of_s1 - s1;
+            if( s1len < s2len ) break;
+            s1 = _fmemchr( s1, *s2, s1len ); /* find start of possible match */
+            if( s1 == NULL ) break;
+            if( memeq( s1, s2, s2len ) ) return( (char _WCFAR *)s1 );
+            ++s1;
+        }
+        return( NULL );
+    }