% avlstuff.w

% Copyright 1996-2006 Han The Thanh <thanh@@pdftex.org>
% Copyright 2006-2009 Taco Hoekwater <taco@@luatex.org>

% This file is part of LuaTeX.

% LuaTeX is free software; you can redistribute it and/or modify it under
% the terms of the GNU General Public License as published by the Free
% Software Foundation; either version 2 of the License, or (at your
% option) any later version.

% LuaTeX is distributed in the hope that it will be useful, but WITHOUT
% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
% FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
% License for more details.

% You should have received a copy of the GNU General Public License along
% with LuaTeX; if not, see <http://www.gnu.org/licenses/>.

@* AVL helper functions.

@ @c
#include "ptexlib.h"
#include "utils/avl.h"

static const char _svn_version[] =
    "$Id: avlstuff.w 3584 2010-04-02 17:45:55Z hhenkel $ "
    "$URL: http://foundry.supelec.fr/svn/luatex/tags/beta-0.70.1/source/texk/web2c/luatexdir/utils/avlstuff.w $";

@ memory management functions for AVL
@c
static void *avl_xmalloc(struct libavl_allocator *allocator, size_t size)
{
    assert(allocator != NULL && size > 0);
    return xmalloc((unsigned) size);
}

static void avl_xfree(struct libavl_allocator *allocator, void *block)
{
    assert(allocator != NULL && block != NULL);
    xfree(block);
}

struct libavl_allocator avl_xallocator = {
    avl_xmalloc,
    avl_xfree
};

@ general AVL comparison functions
@c
int comp_int_entry(const void *pa, const void *pb, void *p)
{
    (void) p;
    cmp_return(*(const int *) pa, *(const int *) pb);
    return 0;
}

int comp_string_entry(const void *pa, const void *pb, void *p)
{
    (void) p;
    return strcmp((const char *) pa, (const char *) pb);
}