    /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
    /*
     * This file is part of the LibreOffice project.
     *
     * This Source Code Form is subject to the terms of the Mozilla Public
     * License, v. 2.0. If a copy of the MPL was not distributed with this
     * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     *
     * This file incorporates work covered by the following license notice:
     *
     *   Licensed to the Apache Software Foundation (ASF) under one or more
     *   contributor license agreements. See the NOTICE file distributed
     *   with this work for additional information regarding copyright
     *   ownership. The ASF licenses this file to you under the Apache
     *   License, Version 2.0 (the "License"); you may not use this file
     *   except in compliance with the License. You may obtain a copy of
     *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
     */
    #include <sal/config.h>

    #include <assert.h>
    #include <rtl/alloc.h>
    #include <rtl/ustring.h>
    #include <rtllifecycle.h>

    #include "strimp.hxx"
    #include "alloc_impl.hxx"
    #include "alloc_arena.hxx"

    sal_Int16 rtl_ImplGetDigit( sal_Unicode ch, sal_Int16 nRadix )
    {
        sal_Int16 n = -1;
        if ( (ch >= '0') && (ch <= '9') )
            n = ch-'0';
        else if ( (ch >= 'a') && (ch <= 'z') )
            n = ch-'a'+10;
        else if ( (ch >= 'A') && (ch <= 'Z') )
            n = ch-'A'+10;
        return (n < nRadix) ? n : -1;
    }

    bool rtl_ImplIsWhitespace( sal_Unicode c )
    {
        /* Space or Control character? */
        if ( (c <= 32) && c )
            return true;

        /* Only in the General Punctuation area Space or Control characters are included? */
        if ( (c < 0x2000) || (c > 0x206F) )
            return false;

        if ( ((c >= 0x2000) && (c <= 0x200B)) ||    /* All Spaces           */
             (c == 0x2028) ||                       /* LINE SEPARATOR       */
             (c == 0x2029) )                        /* PARAGRAPH SEPARATOR  */
            return true;

        return false;
    }

    /*
     * TODO: add a slower, more awful, but more space efficient
     * custom allocator for the pre-init phase. Existing slab
     * allocator's minimum alloc size is 24bytes, and by default
     * is 32 bytes.
     */
    static rtl_arena_type *pre_arena = nullptr;

    rtl_allocateStringFn rtl_allocateString = malloc;
    rtl_freeStringFn rtl_freeString = free;

    extern "C" {
    static void *pre_allocateStringFn(size_t n)
    {
        sal_Size size = RTL_MEMORY_ALIGN(n + 4, 4);
        char *addr = static_cast<char*>(rtl_arena_alloc(pre_arena, &size));
        assert(size>= 12);
        reinterpret_cast<sal_uInt32*>(addr)[0] = size - 12;
        return addr + 4;
    }

    static void pre_freeStringFn(void *data)
    {
        char    *addr = static_cast<char*>(data) - 4;
        sal_uInt32 size = reinterpret_cast<sal_uInt32*>(addr)[0] + 12;

        rtl_arena_free(pre_arena, addr, size);
    }
    } // extern "C"

    static void mark_static(void *addr, sal_Size /* size */)
    {
        char *inner = static_cast<char*>(addr) + 4;
        rtl_uString *str = reinterpret_cast<rtl_uString *>(inner);
        str->refCount |= SAL_STRING_STATIC_FLAG;
    }

    void SAL_CALL rtl_alloc_preInit (sal_Bool start) SAL_THROW_EXTERN_C()
    {
        if (start)
        {
            rtl_allocateString = pre_allocateStringFn;
            rtl_freeString = pre_freeStringFn;
            pre_arena = rtl_arena_create("pre-init strings", 4, 0,
                                         nullptr, rtl_arena_alloc,
                                         rtl_arena_free, 0);

            // To be consistent (and to ensure the rtl_cache threads are started).
            ensureCacheSingleton();
        }
        else
        {
            rtl_arena_foreach(pre_arena, mark_static);
            rtl_allocateString = malloc;
            rtl_freeString = free;

            // TODO: also re-initialize main allocator as well.
        }
    }

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V560 A part of conditional expression is always true: (c >= 0x2000).