/* This is from the BIND 4.9.4 release, modified to compile by itself */

/* Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/* Portions Copyright (c) Microsoft Open Technologies, Inc.  */

/*modifications by Microsoft Open Technologies, Inc. to implement missing inet_pton() from Windows 8 SDK */

#if defined(__MINGW32__)

#    include <errno.h>
#    include <assert.h>
#    include <WS2tcpip.h>
#    include <Winsock2.h>

#    define ERRNO ((int)GetLastError())
#    define SET_ERRNO(x) (SetLastError((DWORD)(x)))

#    include "platform/win32/inet_pton_mingw.h"

#    define ENABLE_IPV6

#    define IN6ADDRSZ 16
#    define INADDRSZ 4
#    define INT16SZ 2

/*
 * WARNING: Don't even consider trying to compile this on a system where
 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
 */

static int inet_pton4(const char* src, unsigned char* dst);
#    ifdef ENABLE_IPV6
static int inet_pton6(const char* src, unsigned char* dst);
#    endif

/* int
 * inet_pton(af, src, dst)
 *      convert from presentation format (which usually means ASCII printable)
 *      to network format (which is usually some kind of binary format).
 * return:
 *      1 if the address was valid for the specified address family
 *      0 if the address wasn't valid (`dst' is untouched in this case)
 *      -1 if some other error occurred (`dst' is untouched in this case, too)
 * notice:
 *      On Windows we store the error in the thread errno, not
 *      in the winsock error code. This is to avoid losing the
 *      actual last winsock error. So use macro ERRNO to fetch the
 *      errno this function sets when returning (-1), not SOCKERRNO.
 * author:
 *      Paul Vixie, 1996.
 */

int inet_pton(int af, const char* src, void* dst)
{
    switch (af)
    {
    case AF_INET:
        return (inet_pton4(src, (unsigned char*)dst));
#    ifdef ENABLE_IPV6
    case AF_INET6:
        return (inet_pton6(src, (unsigned char*)dst));
#    endif
    default:
        SET_ERRNO(EAFNOSUPPORT);
        return (-1);
    }
    /* NOTREACHED */
}

/* int
 * inet_pton4(src, dst)
 *      like inet_aton() but without all the hexadecimal and shorthand.
 * return:
 *      1 if `src' is a valid dotted quad, else 0.
 * notice:
 *      does not touch `dst' unless it's returning 1.
 * author:
 *      Paul Vixie, 1996.
 */
static int inet_pton4(const char* src, unsigned char* dst)
{
    static const char digits[] = "0123456789";
    int saw_digit, octets, ch;
    unsigned char tmp[INADDRSZ], *tp;

    saw_digit = 0;
    octets    = 0;
    tp        = tmp;
    *tp       = 0;
    while ((ch = *src++) != '\0')
    {
        const char* pch;

        if ((pch = strchr(digits, ch)) != NULL)
        {
            unsigned int val = *tp * 10 + (unsigned int)(pch - digits);

            if (saw_digit && *tp == 0)
                return (0);
            if (val > 255)
                return (0);
            *tp = (unsigned char)val;
            if (!saw_digit)
            {
                if (++octets > 4)
                    return (0);
                saw_digit = 1;
            }
        }
        else if (ch == '.' && saw_digit)
        {
            if (octets == 4)
                return (0);
            *++tp     = 0;
            saw_digit = 0;
        }
        else
            return (0);
    }
    if (octets < 4)
        return (0);
    memcpy(dst, tmp, INADDRSZ);
    return (1);
}

#    ifdef ENABLE_IPV6
/* int
 * inet_pton6(src, dst)
 *      convert presentation level address to network order binary form.
 * return:
 *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 * notice:
 *      (1) does not touch `dst' unless it's returning 1.
 *      (2) :: in a full address is silently ignored.
 * credit:
 *      inspired by Mark Andrews.
 * author:
 *      Paul Vixie, 1996.
 */
static int inet_pton6(const char* src, unsigned char* dst)
{
    static const char xdigits_l[] = "0123456789abcdef", xdigits_u[] = "0123456789ABCDEF";
    unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
    const char *xdigits, *curtok;
    int ch, saw_xdigit;
    size_t val;

    memset((tp = tmp), 0, IN6ADDRSZ);
    endp   = tp + IN6ADDRSZ;
    colonp = NULL;
    /* Leading :: requires some special handling. */
    if (*src == ':')
        if (*++src != ':')
            return (0);
    curtok     = src;
    saw_xdigit = 0;
    val        = 0;
    while ((ch = *src++) != '\0')
    {
        const char* pch;

        if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
            pch = strchr((xdigits = xdigits_u), ch);
        if (pch != NULL)
        {
            val <<= 4;
            val |= (pch - xdigits);
            if (++saw_xdigit > 4)
                return (0);
            continue;
        }
        if (ch == ':')
        {
            curtok = src;
            if (!saw_xdigit)
            {
                if (colonp)
                    return (0);
                colonp = tp;
                continue;
            }
            if (tp + INT16SZ > endp)
                return (0);
            *tp++      = (unsigned char)(val >> 8) & 0xff;
            *tp++      = (unsigned char)val & 0xff;
            saw_xdigit = 0;
            val        = 0;
            continue;
        }
        if (ch == '.' && ((tp + INADDRSZ) <= endp) && inet_pton4(curtok, tp) > 0)
        {
            tp += INADDRSZ;
            saw_xdigit = 0;
            break; /* '\0' was seen by inet_pton4(). */
        }
        return (0);
    }
    if (saw_xdigit)
    {
        if (tp + INT16SZ > endp)
            return (0);
        *tp++ = (unsigned char)(val >> 8) & 0xff;
        *tp++ = (unsigned char)val & 0xff;
    }
    if (colonp != NULL)
    {
        /*
         * Since some memmove()'s erroneously fail to handle
         * overlapping regions, we'll do the shift by hand.
         */
        const ssize_t n = tp - colonp;
        ssize_t i;

        if (tp == endp)
            return (0);
        for (i = 1; i <= n; i++)
        {
            *(endp - i)       = *(colonp + n - i);
            *(colonp + n - i) = 0;
        }
        tp = endp;
    }
    if (tp != endp)
        return (0);
    memcpy(dst, tmp, IN6ADDRSZ);
    return (1);
}
#    endif /* ENABLE_IPV6 */

#endif /* HAVE_INET_PTON */