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/*=========================================================================*\
* LuaSocket 2.0.2
* Copyright (C) 2004-2007 Diego Nehab
*
* Socket compatibilization module for Win32
*
* The penalty of calling select to avoid busy-wait is only paid when
* the I/O call fail in the first place. 
*
* RCS ID: $Id: wsocket.c,v 1.36 2007/06/11 23:44:54 diego Exp $
\*=========================================================================*/
#include <string.h>

#include "socket.h"

/*-------------------------------------------------------------------------*\
* Initializes module 
\*-------------------------------------------------------------------------*/
int socket_open(void) {
    WSADATA wsaData;
    WORD wVersionRequested = MAKEWORD(2, 0); 
    int err = WSAStartup(wVersionRequested, &wsaData );
    if (err != 0) return 0;
    if ((LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 0) &&
        (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1)) {
        WSACleanup();
        return 0; 
    }
    return 1;
}

/*-------------------------------------------------------------------------*\
* Close module 
\*-------------------------------------------------------------------------*/
int socket_close(void) {
    WSACleanup();
    return 1;
}

/*-------------------------------------------------------------------------*\
* Wait for readable/writable/connected socket with timeout
\*-------------------------------------------------------------------------*/
int socket_waitfd(p_socket ps, int sw, p_timeout tm) {
    int ret;
    fd_set rfds, wfds, efds, *rp = NULL, *wp = NULL, *ep = NULL;
    struct timeval tv, *tp = NULL;
    double t;
    if (timeout_iszero(tm)) return IO_TIMEOUT;  /* optimize timeout == 0 case */
    if (sw & WAITFD_R) { 
        FD_ZERO(&rfds); 
		FD_SET(*ps, &rfds);
        rp = &rfds; 
    }
    if (sw & WAITFD_W) { FD_ZERO(&wfds); FD_SET(*ps, &wfds); wp = &wfds; }
    if (sw & WAITFD_C) { FD_ZERO(&efds); FD_SET(*ps, &efds); ep = &efds; }
    if ((t = timeout_get(tm)) >= 0.0) {
        tv.tv_sec = (int) t;
        tv.tv_usec = (int) ((t-tv.tv_sec)*1.0e6);
        tp = &tv;
    }
    ret = select(0, rp, wp, ep, tp);
    if (ret == -1) return WSAGetLastError();
    if (ret == 0) return IO_TIMEOUT;
    if (sw == WAITFD_C && FD_ISSET(*ps, &efds)) return IO_CLOSED;
    return IO_DONE;
}

/*-------------------------------------------------------------------------*\
* Close and inutilize socket
\*-------------------------------------------------------------------------*/
void socket_destroy(p_socket ps) {
    if (*ps != SOCKET_INVALID) {
        socket_setblocking(ps); /* close can take a long time on WIN32 */
        closesocket(*ps);
        *ps = SOCKET_INVALID;
    }
}

/*-------------------------------------------------------------------------*\
* Put socket into blocking mode
\*-------------------------------------------------------------------------*/
void socket_setblocking(p_socket ps) {
    u_long argp = 0;
    ioctlsocket(*ps, FIONBIO, &argp);
}

/*-------------------------------------------------------------------------*\
* Put socket into non-blocking mode
\*-------------------------------------------------------------------------*/
void socket_setnonblocking(p_socket ps) {
    u_long argp = 1;
    ioctlsocket(*ps, FIONBIO, &argp);
}

/*-------------------------------------------------------------------------*\
* Error translation functions
\*-------------------------------------------------------------------------*/

/* WinSock doesn't have a strerror... */
static const char *wstrerror(int err) {
    switch (err) {
        case WSAEINTR: return "Interrupted function call";
        case WSAEACCES: return "Permission denied";
        case WSAEFAULT: return "Bad address";
        case WSAEINVAL: return "Invalid argument";
        case WSAEMFILE: return "Too many open files";
        case WSAEWOULDBLOCK: return "Resource temporarily unavailable";
        case WSAEINPROGRESS: return "Operation now in progress";
        case WSAEALREADY: return "Operation already in progress";
        case WSAENOTSOCK: return "Socket operation on nonsocket";
        case WSAEDESTADDRREQ: return "Destination address required";
        case WSAEMSGSIZE: return "Message too long";
        case WSAEPROTOTYPE: return "Protocol wrong type for socket";
        case WSAENOPROTOOPT: return "Bad protocol option";
        case WSAEPROTONOSUPPORT: return "Protocol not supported";
        case WSAESOCKTNOSUPPORT: return "Socket type not supported";
        case WSAEOPNOTSUPP: return "Operation not supported";
        case WSAEPFNOSUPPORT: return "Protocol family not supported";
        case WSAEAFNOSUPPORT: 
            return "Address family not supported by protocol family"; 
        case WSAEADDRINUSE: return "Address already in use";
        case WSAEADDRNOTAVAIL: return "Cannot assign requested address";
        case WSAENETDOWN: return "Network is down";
        case WSAENETUNREACH: return "Network is unreachable";
        case WSAENETRESET: return "Network dropped connection on reset";
        case WSAECONNABORTED: return "Software caused connection abort";
        case WSAECONNRESET: return "Connection reset by peer";
        case WSAENOBUFS: return "No buffer space available";
        case WSAEISCONN: return "Socket is already connected";
        case WSAENOTCONN: return "Socket is not connected";
        case WSAESHUTDOWN: return "Cannot send after socket shutdown";
        case WSAETIMEDOUT: return "Connection timed out";
        case WSAECONNREFUSED: return "Connection refused";
        case WSAEHOSTDOWN: return "Host is down";
        case WSAEHOSTUNREACH: return "No route to host";
        case WSAEPROCLIM: return "Too many processes";
        case WSASYSNOTREADY: return "Network subsystem is unavailable";
        case WSAVERNOTSUPPORTED: return "Winsock.dll version out of range";
        case WSANOTINITIALISED: 
            return "Successful WSAStartup not yet performed";
        case WSAEDISCON: return "Graceful shutdown in progress";
        case WSAHOST_NOT_FOUND: return "Host not found";
        case WSATRY_AGAIN: return "Nonauthoritative host not found";
        case WSANO_RECOVERY: return "Nonrecoverable name lookup error"; 
        case WSANO_DATA: return "Valid name, no data record of requested type";
        default: return "Unknown error";
    }
}

const char *socket_strerror(int err) {
    if (err <= 0) return io_strerror(err);
    switch (err) {
        case WSAEADDRINUSE: return "address already in use";
        case WSAECONNREFUSED: return "connection refused";
        case WSAEISCONN: return "already connected";
        case WSAEACCES: return "permission denied";
        case WSAECONNABORTED: return "closed";
        case WSAECONNRESET: return "closed";
        case WSAETIMEDOUT: return "timeout";
        default: return wstrerror(err);
    }
}

/* Socket error code */
int socket_error()
{
   return WSAGetLastError();
}