ks_common.h

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/*
 * libkarmaclient - A C Library to the Karmasphere Reputation Server
 * Copyright (C) 2006 Karmasphere <http://www.karmasphere.com/>
 *  - Shevek <shevek@karmasphere.com>
 *  - Dave Stewart <dave.stewart@karmasphere.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 */

#ifndef INC_KS_COMMON_H
#define INC_KS_COMMON_H

#include "ks_malloc.h"

typedef struct _ks_base_t ks_base_t;

typedef struct _ks_string_t ks_string_t;

typedef void (*ks_destroy_t)(ks_base_t *);

typedef void (*ks_bappend_t)(ks_string_t *, ks_base_t *);

typedef struct _ks_type_t {
        const char      *name;         
        ks_destroy_t destroy;      
        ks_bappend_t bappend;      
} ks_type_t;

struct _ks_base_t {
        ks_type_t *type;
};

static inline void
ks_destroy(ks_base_t *b)
{
        b->type->destroy(b);
}

static inline void
ks_bappend(ks_string_t *r, ks_base_t *b)
{
        b->type->bappend(r, b);
}

typedef void (*ks_error_handler_t)(const char *);

void ks_error_handler_set(ks_error_handler_t);
void ks_error(const char *, ...);

static inline ks_base_t *
ks_cast_error(const char *req, ks_base_t *v)
{
        ks_error("Error casting to %s: got %s\n", req, v->type);
        return v;
}

/* XXX This doesn't allow us to cast NULL. Do better. */
#define KS_CAST(t, v) ((t ## _t *)      \
                (       \
                        ((v)->type == t ## _type())     \
                                ? (v)   \
                                : ks_cast_error(#t, v)  \
                )       \
        )

#endif

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