Ivo Noorhoff / UIPEthernet

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utility/os2_stoip4.c@16:269f652b4d0b, 2020-06-05 (annotated)

Committer:
hudakz
Date:
Fri Jun 05 15:12:21 2020 +0000
Revision:
16:269f652b4d0b
Parent:
utility/stoip4.c@14:7648334eb41b 
Library for ENC28J60 Ethernet modules.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 14:7648334eb41b 1 /*
hudakz 14:7648334eb41b 2 * Copyright (c) 2014-2018 ARM Limited. All rights reserved.
hudakz 14:7648334eb41b 3 * SPDX-License-Identifier: Apache-2.0
hudakz 14:7648334eb41b 4 * Licensed under the Apache License, Version 2.0 (the License); you may
hudakz 14:7648334eb41b 5 * not use this file except in compliance with the License.
hudakz 14:7648334eb41b 6 * You may obtain a copy of the License at
hudakz 14:7648334eb41b 7 *
hudakz 14:7648334eb41b 8 * http://www.apache.org/licenses/LICENSE-2.0
hudakz 14:7648334eb41b 9 *
hudakz 14:7648334eb41b 10 * Unless required by applicable law or agreed to in writing, software
hudakz 14:7648334eb41b 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
hudakz 14:7648334eb41b 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
hudakz 14:7648334eb41b 13 * See the License for the specific language governing permissions and
hudakz 14:7648334eb41b 14 * limitations under the License.
hudakz 14:7648334eb41b 15 */
hudakz 14:7648334eb41b 16 #include "mbed_version.h"
hudakz 14:7648334eb41b 17
hudakz 14:7648334eb41b 18 #if MBED_MAJOR_VERSION == 2
hudakz 14:7648334eb41b 19
hudakz 14:7648334eb41b 20 #include <string.h>
hudakz 14:7648334eb41b 21 #include <stdlib.h>
hudakz 14:7648334eb41b 22 #include <stdint.h>
hudakz 14:7648334eb41b 23 #include "common_functions.h"
hudakz 14:7648334eb41b 24 #include "ip4string.h"
hudakz 14:7648334eb41b 25
hudakz 14:7648334eb41b 26 /**
hudakz 14:7648334eb41b 27 * Convert numeric IPv4 address string to a binary.
hudakz 14:7648334eb41b 28 * \param ip4addr IPv4 address in string format.
hudakz 14:7648334eb41b 29 * \param len Length of IPv4 string, maximum of 16..
hudakz 14:7648334eb41b 30 * \param dest buffer for address. MUST be 4 bytes.
hudakz 14:7648334eb41b 31 * \return boolean set to true if conversion succeded, false if it didn't
hudakz 14:7648334eb41b 32 */
hudakz 14:7648334eb41b 33 bool stoip4(const char *ip4addr, size_t len, void *dest)
hudakz 14:7648334eb41b 34 {
hudakz 14:7648334eb41b 35 uint8_t *addr = dest;
hudakz 14:7648334eb41b 36
hudakz 14:7648334eb41b 37 if (len > 16) { // Too long, not possible
hudakz 14:7648334eb41b 38 return false;
hudakz 14:7648334eb41b 39 }
hudakz 14:7648334eb41b 40
hudakz 14:7648334eb41b 41 uint_fast8_t stringLength = 0, byteCount = 0;
hudakz 14:7648334eb41b 42
hudakz 14:7648334eb41b 43 //Iterate over each component of the IP. The exit condition is in the middle of the loop
hudakz 14:7648334eb41b 44 while (true) {
hudakz 14:7648334eb41b 45
hudakz 14:7648334eb41b 46 //No valid character (IPv4 addresses don't have implicit 0, that is x.y..z being read as x.y.0.z)
hudakz 14:7648334eb41b 47 if (stringLength == len || ip4addr[stringLength] < '0' || ip4addr[stringLength] > '9') {
hudakz 14:7648334eb41b 48 return false;
hudakz 14:7648334eb41b 49 }
hudakz 14:7648334eb41b 50
hudakz 14:7648334eb41b 51 //For each component, we convert it to the raw value
hudakz 14:7648334eb41b 52 uint_fast16_t byte = 0;
hudakz 14:7648334eb41b 53 while (stringLength < len && ip4addr[stringLength] >= '0' && ip4addr[stringLength] <= '9') {
hudakz 14:7648334eb41b 54 byte *= 10;
hudakz 14:7648334eb41b 55 byte += ip4addr[stringLength++] - '0';
hudakz 14:7648334eb41b 56
hudakz 14:7648334eb41b 57 //We go over the maximum value for an IPv4 component
hudakz 14:7648334eb41b 58 if (byte > 0xff) {
hudakz 14:7648334eb41b 59 return false;
hudakz 14:7648334eb41b 60 }
hudakz 14:7648334eb41b 61 }
hudakz 14:7648334eb41b 62
hudakz 14:7648334eb41b 63 //Append the component
hudakz 14:7648334eb41b 64 addr[byteCount++] = (uint8_t) byte;
hudakz 14:7648334eb41b 65
hudakz 14:7648334eb41b 66 //If we're at the end, we leave the loop. It's the only way to reach the `true` output
hudakz 14:7648334eb41b 67 if (byteCount == 4) {
hudakz 14:7648334eb41b 68 break;
hudakz 14:7648334eb41b 69 }
hudakz 14:7648334eb41b 70
hudakz 14:7648334eb41b 71 //If the next character is invalid, we return false
hudakz 14:7648334eb41b 72 if (stringLength == len || ip4addr[stringLength++] != '.') {
hudakz 14:7648334eb41b 73 return false;
hudakz 14:7648334eb41b 74 }
hudakz 14:7648334eb41b 75 }
hudakz 14:7648334eb41b 76
hudakz 14:7648334eb41b 77 return stringLength == len || ip4addr[stringLength] == '\0';
hudakz 14:7648334eb41b 78 }
hudakz 14:7648334eb41b 79 #endif