#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <sys/types.h>
#include <sys/socket.h>

#include "gai.h"

/*
 * Basic error checking of flags, family, socket type, and protocol.
 */

int ga_echeck(const char *hostname, const char *servname, int flags, int family, int socktype, int protocol)
{
    if (flags & ~(AI_PASSIVE | AI_CANONNAME))
	return (EAI_BADFLAGS);	/* unknown flag bits */

    if (hostname == NULL || hostname[0] == '\0') {
	if (servname == NULL || servname[0] == '\0')
	    return (EAI_NONAME);	/* host or service must be specified */
    }

    switch (family) {
    case AF_UNSPEC:
	break;
#ifdef	IPV4
    case AF_INET:
	if (socktype != 0 && (socktype != SOCK_STREAM && socktype != SOCK_DGRAM && socktype != SOCK_RAW))
	    return (EAI_SOCKTYPE);	/* invalid socket type */
	break;
#endif
#ifdef	IPV6
    case AF_INET6:
	if (socktype != 0 && (socktype != SOCK_STREAM && socktype != SOCK_DGRAM && socktype != SOCK_RAW))
	    return (EAI_SOCKTYPE);	/* invalid socket type */
	break;
#endif
    case AF_LOCAL:
	if (socktype != 0 && (socktype != SOCK_STREAM && socktype != SOCK_DGRAM))
	    return (EAI_SOCKTYPE);	/* invalid socket type */
	break;
    default:
	return (EAI_FAMILY);	/* unknown protocol family */
    }
    return (0);
}