/*
 * Copyright (c) 2007-2009, 2013 Paul Mattes.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the names of Paul Mattes nor the names of his contributors
 *       may be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PAUL MATTES "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL PAUL MATTES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *	w3misc.c
 *		Miscellaneous Win32 functions.
 */

#include "globals.h"

#if !defined(_WIN32) /*[*/
#error This module is only for Win32.
#endif /*]*/

#include <stdio.h>
#include <errno.h>

#include "w3miscc.h"

/* Initialize Winsock. */
int
sockstart(void)
{
	static int initted = 0;
	WORD wVersionRequested;
	WSADATA wsaData;
 
	if (initted)
		return 0;

	initted = 1;

	wVersionRequested = MAKEWORD(2, 2);
 
	if (WSAStartup(wVersionRequested, &wsaData) != 0) {
		fprintf(stderr, "WSAStartup failed: %s\n",
			win32_strerror(GetLastError()));
		return -1;
	}
 
	if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
		fprintf(stderr, "Bad winsock version: %d.%d\n",
			LOBYTE(wsaData.wVersion), HIBYTE(wsaData.wVersion));
		return -1;
	}

	return 0;
}

/* Convert a network address to a string. */
const char *
inet_ntop(int af, const void *src, char *dst, socklen_t cnt)
{
    	union {
	    	struct sockaddr sa;
		struct sockaddr_in sin;
		struct sockaddr_in6 sin6;
	} sa;
	DWORD ssz;
	DWORD sz = cnt;

	memset(&sa, '\0', sizeof(sa));

	switch (af) {
	case AF_INET:
	    	sa.sin = *(struct sockaddr_in *)src;	/* struct copy */
		ssz = sizeof(struct sockaddr_in);
		break;
	case AF_INET6:
	    	sa.sin6 = *(struct sockaddr_in6 *)src;	/* struct copy */
		ssz = sizeof(struct sockaddr_in6);
		break;
	default:
	    	if (cnt > 0)
			dst[0] = '\0';
		return NULL;
	}

	sa.sa.sa_family = af;

	if (WSAAddressToString(&sa.sa, ssz, NULL, dst, &sz) != 0) {
	    	if (cnt > 0)
			dst[0] = '\0';
		return NULL;
	}

	return dst;
}

/* Decode a Win32 error number. */
const char *
win32_strerror(int e)
{
	static char buffer[4096];

	if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
	    NULL,
	    e,
	    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
	    buffer,
	    sizeof(buffer),
	    NULL) == 0) {
	    
	    sprintf(buffer, "Windows error %d", e);
	}

	return buffer;
}

#if defined(_MSC_VER) /*[*/

/* MinGW has gettimofday(), but MSVC does not. */

#define SECS_BETWEEN_EPOCHS	11644473600ULL
#define SECS_TO_100NS		10000000ULL /* 10^7 */

int
gettimeofday(struct timeval *tv, void *ignored)
{
	FILETIME t;
	ULARGE_INTEGER u;

	GetSystemTimeAsFileTime(&t);
	memcpy(&u, &t, sizeof(ULARGE_INTEGER));

	/* Isolate seconds and move epochs. */
	tv->tv_sec = (DWORD)((u.QuadPart / SECS_TO_100NS) -
			       	SECS_BETWEEN_EPOCHS);
	tv->tv_usec = (u.QuadPart % SECS_TO_100NS) / 10ULL;
	return 0;
}

/* MinGW has getopt(), but MSVC does not. */

char *optarg;
int optind = 1, opterr = 1, optopt;
static const char *nextchar = NULL;

int
getopt(int argc, char * const argv[], const char *optstring)
{
    	char c;
	const char *s;

    	if (optind == 1)
		nextchar = argv[optind++];

	do {
	    	if (nextchar == argv[optind - 1]) {
			if (optind > argc) {
				--optind; /* went too far */
				return -1;
			}
			if (nextchar == NULL) {
				--optind; /* went too far */
				return -1;
			}
			if (!strcmp(nextchar, "--"))
				return -1;
			if (*nextchar++ != '-') {
				--optind;
				return -1;
			}
		}

		if ((c = *nextchar++) == '\0')
			nextchar = argv[optind++];
	} while (nextchar == argv[optind - 1]);

	s = strchr(optstring, c);
	if (s == NULL) {
	    	if (opterr)
		    	fprintf(stderr, "Unknown option '%c'\n", c);
		return '?';
	}
	if (*(s + 1) == ':') {
	    	if (*nextchar) {
		    	optarg = (char *)nextchar;
			nextchar = argv[optind++];
			return c;
		} else if (optind < argc && argv[optind] != NULL) {
		    	optarg = (char *)argv[optind++];
			nextchar = argv[optind++];
			return c;
		} else {
		    	if (opterr)
			    	fprintf(stderr, "Missing value after '%c'\n",
					c);
			return -1;
		}
	} else
	    	return c;
}

#endif /*]*/
