drivers/net/nsos_netdb.c

/**
 * Copyright (c) 2023-2024 Marcin Niestroj
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * netdb.h related code common to Zephyr (top: nsos_sockets.c) and Linux
 * (bottom: nsos_adapt.c).
 *
 * It is needed by both sides to share the same macro definitions/values
 * (prefixed with NSOS_MID_), which is not possible to achieve with two separate
 * standard libc libraries, since they use different values for the same
 * symbols.
 */

#include "nsos_netdb.h"

#ifdef __ZEPHYR__

#include <zephyr/net/socket.h>
#define ERR(_name)				\
	{ DNS_ ## _name, NSOS_MID_ ## _name }

#else

#include <netdb.h>
#define ERR(_name)				\
	{ _name, NSOS_MID_ ## _name }

#endif

#ifndef ARRAY_SIZE
#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
#endif

struct nsos_eai_map {
	int err;
	int mid_err;
};

static const struct nsos_eai_map map[] = {
	ERR(EAI_BADFLAGS),
	ERR(EAI_NONAME),
	ERR(EAI_AGAIN),
	ERR(EAI_FAIL),
	ERR(EAI_FAMILY),
	ERR(EAI_SOCKTYPE),
	ERR(EAI_SERVICE),
	ERR(EAI_MEMORY),
	ERR(EAI_SYSTEM),
	ERR(EAI_OVERFLOW),
};

int eai_to_nsos_mid(int err)
{
	for (int i = 0; i < ARRAY_SIZE(map); i++) {
		if (map[i].err == err) {
			return map[i].mid_err;
		}
	}

	return err;
}

int eai_from_nsos_mid(int err)
{
	for (int i = 0; i < ARRAY_SIZE(map); i++) {
		if (map[i].mid_err == err) {
			return map[i].err;
		}
	}

	return err;
}