/*
 * Copyright (C) 2006 Martin Willi
 * Hochschule fuer Technik Rapperswil
 *
 * This program 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program 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 General Public License
 * for more details.
 *
 * $Id: enum.c 3589 2008-03-13 14:14:44Z martin $
 */

#include <stddef.h>
#include <stdio.h>

#include "enum.h"

#include <printf_hook.h>

/**
 * get the name of an enum value in a enum_name_t list
 */
static char *enum_name(enum_name_t *e, int val)
{
	do
	{
		if (val >= e->first && val <= e->last)
		{
			return e->names[val - e->first];
		}
	}
	while ((e = e->next));
	return NULL;
}

/**
 * output handler in printf() for enum names
 */
static int print(FILE *stream, const struct printf_info *info,
					  const void *const *args)
{
	enum_name_t *ed = *((enum_name_t**)(args[0]));
	int val = *((int*)(args[1]));

	char *name = enum_name(ed, val);

	if (name == NULL)
	{
		return fprintf(stream, "(%d)", val);
	}
	else
	{
		return fprintf(stream, "%s", name);
	}
}

/**
 * arginfo handler for printf() hook
 */
static int arginfo(const struct printf_info *info, size_t n, int *argtypes)
{
	if (n > 1)
	{
		argtypes[0] = PA_POINTER;
		argtypes[1] = PA_INT;
	}
	return 2;
}

/**
 * return printf hook functions
 */
printf_hook_functions_t enum_get_printf_hooks()
{
	printf_hook_functions_t hooks = {print, arginfo};
	
	return hooks;
}