source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/arduino/avr/firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/SERVICES/LWIP/lwip-1.3.2/src/core/ipv4/inet.c @ 4837

Last change on this file since 4837 was 4837, checked in by daduve, 2 years ago

Adding new version

File size: 7.1 KB
Line 
1/* This source file is part of the ATMEL AVR-UC3-SoftwareFramework-1.7.0 Release */
2
3/**
4 * @file
5 * Functions common to all TCP/IPv4 modules, such as the byte order functions.
6 *
7 */
8
9/*
10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without modification,
14 * are permitted provided that the following conditions are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright notice,
17 *    this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright notice,
19 *    this list of conditions and the following disclaimer in the documentation
20 *    and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote products
22 *    derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * OF SUCH DAMAGE.
34 *
35 * This file is part of the lwIP TCP/IP stack.
36 *
37 * Author: Adam Dunkels <adam@sics.se>
38 *
39 */
40
41#include "lwip/opt.h"
42
43#include "lwip/inet.h"
44
45/* Here for now until needed in other places in lwIP */
46#ifndef isprint
47#define in_range(c, lo, up)  ((u8_t)c >= lo && (u8_t)c <= up)
48#define isprint(c)           in_range(c, 0x20, 0x7f)
49#define isdigit(c)           in_range(c, '0', '9')
50#define isxdigit(c)          (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
51#define islower(c)           in_range(c, 'a', 'z')
52#define isspace(c)           (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
53#endif   
54   
55/**
56 * Ascii internet address interpretation routine.
57 * The value returned is in network order.
58 *
59 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
60 * @return ip address in network order
61 */
62u32_t
63inet_addr(const char *cp)
64{
65  struct in_addr val;
66
67  if (inet_aton(cp, &val)) {
68    return (val.s_addr);
69  }
70  return (INADDR_NONE);
71}
72
73/**
74 * Check whether "cp" is a valid ascii representation
75 * of an Internet address and convert to a binary address.
76 * Returns 1 if the address is valid, 0 if not.
77 * This replaces inet_addr, the return value from which
78 * cannot distinguish between failure and a local broadcast address.
79 *
80 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
81 * @param addr pointer to which to save the ip address in network order
82 * @return 1 if cp could be converted to addr, 0 on failure
83 */
84int
85inet_aton(const char *cp, struct in_addr *addr)
86{
87  u32_t val;
88  u8_t base;
89  char c;
90  u32_t parts[4];
91  u32_t *pp = parts;
92
93  c = *cp;
94  for (;;) {
95    /*
96     * Collect number up to ``.''.
97     * Values are specified as for C:
98     * 0x=hex, 0=octal, 1-9=decimal.
99     */
100    if (!isdigit(c))
101      return (0);
102    val = 0;
103    base = 10;
104    if (c == '0') {
105      c = *++cp;
106      if (c == 'x' || c == 'X') {
107        base = 16;
108        c = *++cp;
109      } else
110        base = 8;
111    }
112    for (;;) {
113      if (isdigit(c)) {
114        val = (val * base) + (int)(c - '0');
115        c = *++cp;
116      } else if (base == 16 && isxdigit(c)) {
117        val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
118        c = *++cp;
119      } else
120        break;
121    }
122    if (c == '.') {
123      /*
124       * Internet format:
125       *  a.b.c.d
126       *  a.b.c   (with c treated as 16 bits)
127       *  a.b (with b treated as 24 bits)
128       */
129      if (pp >= parts + 3)
130        return (0);
131      *pp++ = val;
132      c = *++cp;
133    } else
134      break;
135  }
136  /*
137   * Check for trailing characters.
138   */
139  if (c != '\0' && !isspace(c))
140    return (0);
141  /*
142   * Concoct the address according to
143   * the number of parts specified.
144   */
145  switch (pp - parts + 1) {
146
147  case 0:
148    return (0);       /* initial nondigit */
149
150  case 1:             /* a -- 32 bits */
151    break;
152
153  case 2:             /* a.b -- 8.24 bits */
154    if (val > 0xffffffUL)
155      return (0);
156    val |= parts[0] << 24;
157    break;
158
159  case 3:             /* a.b.c -- 8.8.16 bits */
160    if (val > 0xffff)
161      return (0);
162    val |= (parts[0] << 24) | (parts[1] << 16);
163    break;
164
165  case 4:             /* a.b.c.d -- 8.8.8.8 bits */
166    if (val > 0xff)
167      return (0);
168    val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
169    break;
170  }
171  if (addr)
172    addr->s_addr = htonl(val);
173  return (1);
174}
175
176/**
177 * Convert numeric IP address into decimal dotted ASCII representation.
178 * returns ptr to static buffer; not reentrant!
179 *
180 * @param addr ip address in network order to convert
181 * @return pointer to a global static (!) buffer that holds the ASCII
182 *         represenation of addr
183 */
184char *
185inet_ntoa(struct in_addr addr)
186{
187  static char str[16];
188  u32_t s_addr = addr.s_addr;
189  char inv[3];
190  char *rp;
191  u8_t *ap;
192  u8_t rem;
193  u8_t n;
194  u8_t i;
195
196  rp = str;
197  ap = (u8_t *)&s_addr;
198  for(n = 0; n < 4; n++) {
199    i = 0;
200    do {
201      rem = *ap % (u8_t)10;
202      *ap /= (u8_t)10;
203      inv[i++] = '0' + rem;
204    } while(*ap);
205    while(i--)
206      *rp++ = inv[i];
207    *rp++ = '.';
208    ap++;
209  }
210  *--rp = 0;
211  return str;
212}
213
214/**
215 * These are reference implementations of the byte swapping functions.
216 * Again with the aim of being simple, correct and fully portable.
217 * Byte swapping is the second thing you would want to optimize. You will
218 * need to port it to your architecture and in your cc.h:
219 *
220 * #define LWIP_PLATFORM_BYTESWAP 1
221 * #define LWIP_PLATFORM_HTONS(x) <your_htons>
222 * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
223 *
224 * Note ntohs() and ntohl() are merely references to the htonx counterparts.
225 */
226
227#if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
228
229/**
230 * Convert an u16_t from host- to network byte order.
231 *
232 * @param n u16_t in host byte order
233 * @return n in network byte order
234 */
235u16_t
236htons(u16_t n)
237{
238  return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
239}
240
241/**
242 * Convert an u16_t from network- to host byte order.
243 *
244 * @param n u16_t in network byte order
245 * @return n in host byte order
246 */
247u16_t
248ntohs(u16_t n)
249{
250  return htons(n);
251}
252
253/**
254 * Convert an u32_t from host- to network byte order.
255 *
256 * @param n u32_t in host byte order
257 * @return n in network byte order
258 */
259u32_t
260htonl(u32_t n)
261{
262  return ((n & 0xff) << 24) |
263    ((n & 0xff00) << 8) |
264    ((n & 0xff0000UL) >> 8) |
265    ((n & 0xff000000UL) >> 24);
266}
267
268/**
269 * Convert an u32_t from network- to host byte order.
270 *
271 * @param n u32_t in network byte order
272 * @return n in host byte order
273 */
274u32_t
275ntohl(u32_t n)
276{
277  return htonl(n);
278}
279
280#endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */
Note: See TracBrowser for help on using the repository browser.