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/**

 * @file

 * Functions common to all TCP/IPv4 modules, such as the byte order functions.

 *

 */

/*

 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. 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.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.

 *

 * This file is part of the lwIP TCP/IP stack.

 *

 * Author: Adam Dunkels <adam@sics.se>

 *

 */

#include "lwip/opt.h"

#include "lwip/inet.h"

/* Here for now until needed in other places in lwIP */

#ifndef isprint

#define in_range(c, lo, up)  ((u8_t)c >= lo && (u8_t)c <= up)

#define isprint(c)           in_range(c, 0x20, 0x7f)

#define isdigit(c)           in_range(c, '0', '9')

#define isxdigit(c)          (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))

#define islower(c)           in_range(c, 'a', 'z')

#define isspace(c)           (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')

#endif    

/**

 * Ascii internet address interpretation routine.

 * The value returned is in network order.

 *

 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")

 * @return ip address in network order

 */

u32_t

inet_addr(const char *cp)

{

  struct in_addr val;

  if (inet_aton(cp, &val)) {

    return (val.s_addr);

  }

  return (INADDR_NONE);

}

/**

 * Check whether "cp" is a valid ascii representation

 * of an Internet address and convert to a binary address.

 * Returns 1 if the address is valid, 0 if not.

 * This replaces inet_addr, the return value from which

 * cannot distinguish between failure and a local broadcast address.

 *

 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")

 * @param addr pointer to which to save the ip address in network order

 * @return 1 if cp could be converted to addr, 0 on failure

 */

int

inet_aton(const char *cp, struct in_addr *addr)

{

  u32_t val;

  u8_t base;

  char c;

  u32_t parts[4];

  u32_t *pp = parts;

  c = *cp;

  for (;;) {

    /*

     * Collect number up to ``.''.

     * Values are specified as for C:

     * 0x=hex, 0=octal, 1-9=decimal.

     */

    if (!isdigit(c))

      return (0);

    val = 0;

    base = 10;

    if (c == '0') {

      c = *++cp;

      if (c == 'x' || c == 'X') {

        base = 16;

        c = *++cp;

      } else

        base = 8;

    }

    for (;;) {

      if (isdigit(c)) {

        val = (val * base) + (int)(c - '0');

        c = *++cp;

      } else if (base == 16 && isxdigit(c)) {

        val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));

        c = *++cp;

      } else

        break;

    }

    if (c == '.') {

      /*

       * Internet format:

       *  a.b.c.d

       *  a.b.c   (with c treated as 16 bits)

       *  a.b (with b treated as 24 bits)

       */

      if (pp >= parts + 3)

        return (0);

      *pp++ = val;

      c = *++cp;

    } else

      break;

  }

  /*

   * Check for trailing characters.

   */

  if (c != '\0' && !isspace(c))

    return (0);

  /*

   * Concoct the address according to

   * the number of parts specified.

   */

  switch (pp - parts + 1) {

  case 0:

    return (0);       /* initial nondigit */

  case 1:             /* a -- 32 bits */

    break;

  case 2:             /* a.b -- 8.24 bits */

    if (val > 0xffffffUL)

      return (0);

    val |= parts[0] << 24;

    break;

  case 3:             /* a.b.c -- 8.8.16 bits */

    if (val > 0xffff)

      return (0);

    val |= (parts[0] << 24) | (parts[1] << 16);

    break;

  case 4:             /* a.b.c.d -- 8.8.8.8 bits */

    if (val > 0xff)

      return (0);

    val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);

    break;

  }

  if (addr)

    addr->s_addr = htonl(val);

  return (1);

}

/**

 * Convert numeric IP address into decimal dotted ASCII representation.

 * returns ptr to static buffer; not reentrant!

 *

 * @param addr ip address in network order to convert

 * @return pointer to a global static (!) buffer that holds the ASCII

 *         represenation of addr

 */

char *

inet_ntoa(struct in_addr addr)

{

  static char str[16];

  u32_t s_addr = addr.s_addr;

  char inv[3];

  char *rp;

  u8_t *ap;

  u8_t rem;

  u8_t n;

  u8_t i;

  rp = str;

  ap = (u8_t *)&s_addr;

  for(n = 0; n < 4; n++) {

    i = 0;

    do {

      rem = *ap % (u8_t)10;

      *ap /= (u8_t)10;

      inv[i++] = '0' + rem;

    } while(*ap);

    while(i--)

      *rp++ = inv[i];

    *rp++ = '.';

    ap++;

  }

  *--rp = 0;

  return str;

}

/**

 * These are reference implementations of the byte swapping functions.

 * Again with the aim of being simple, correct and fully portable.

 * Byte swapping is the second thing you would want to optimize. You will

 * need to port it to your architecture and in your cc.h:

 *

 * #define LWIP_PLATFORM_BYTESWAP 1

 * #define LWIP_PLATFORM_HTONS(x) <your_htons>

 * #define LWIP_PLATFORM_HTONL(x) <your_htonl>

 *

 * Note ntohs() and ntohl() are merely references to the htonx counterparts.

 */

#if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)

/**

 * Convert an u16_t from host- to network byte order.

 *

 * @param n u16_t in host byte order

 * @return n in network byte order

 */

u16_t

htons(u16_t n)

{

  return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);

}

/**

 * Convert an u16_t from network- to host byte order.

 *

 * @param n u16_t in network byte order

 * @return n in host byte order

 */

u16_t

ntohs(u16_t n)

{

  return htons(n);

}

/**

 * Convert an u32_t from host- to network byte order.

 *

 * @param n u32_t in host byte order

 * @return n in network byte order

 */

u32_t

htonl(u32_t n)

{

  return ((n & 0xff) << 24) |

    ((n & 0xff00) << 8) |

    ((n & 0xff0000UL) >> 8) |

    ((n & 0xff000000UL) >> 24);

}

/**

 * Convert an u32_t from network- to host byte order.

 *

 * @param n u32_t in network byte order

 * @return n in host byte order

 */

u32_t

ntohl(u32_t n)

{

  return htonl(n);

}

#endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */