Clib string & memory functions

git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60

programs/develop/open watcom/trunk/clib/string/strlcat.c

@@ -0,0 +1,68 @@
+/****************************************************************************
+*
+*                            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 BSD style strlcat() and wcslcat().
+*
+****************************************************************************/
+
+
+#include "variety.h"
+#include "widechar.h"
+#include <string.h>
+
+
+_WCRTLINK size_t __F_NAME(strlcat,wcslcat)( CHAR_TYPE *dst, const CHAR_TYPE *t, size_t n )
+{
+    CHAR_TYPE   *s;
+    size_t      len;
+
+    s = dst;
+    // Find end of string in destination buffer but don't overrun
+    for( len = n; len; --len ) {
+        if( *s == NULLCHAR ) break;
+        ++s;
+    }
+    // If no null char was found in dst, the buffer is messed up; don't
+    // touch it
+    if( *s == NULLCHAR ) {
+        --len;      // Decrement len to leave space for terminating null
+        while( len != 0 ) {
+            *s = *t;
+            if( *s == NULLCHAR ) {
+                return( n - len - 1 );
+            }
+            ++s;
+            ++t;
+            --len;
+        }
+        // Buffer not large enough. Terminate and figure out desired length
+        *s = NULLCHAR;
+        while( *t++ != NULLCHAR )
+            ++n;
+        --n;
+    }
+    return( n );
+}