123
utility/ip4tos.c
- Committer:
- hudakz
- Date:
- 2019-09-03
- Revision:
- 14:7648334eb41b
File content as of revision 14:7648334eb41b:
/* * Copyright (c) 2014-2018 ARM Limited. All rights reserved. * SPDX-License-Identifier: Apache-2.0 * Licensed under the Apache License, Version 2.0 (the License); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an AS IS BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "mbed_version.h" #if MBED_MAJOR_VERSION == 2 #include <stdio.h> #include <string.h> #include "common_functions.h" #include "ip4string.h" static void ipv4_itoa(char *string, uint8_t byte); /** * Print binary IPv4 address to a string. * String must contain enough room for full address, 16 bytes exact. * \param addr IPv4 address. * \p buffer to write string to. */ uint_fast8_t ip4tos(const void *ip4addr, char *p) { uint_fast8_t outputPos = 0; const uint8_t *byteArray = ip4addr; for (uint_fast8_t component = 0; component < 4; ++component) { //Convert the byte to string ipv4_itoa(&p[outputPos], byteArray[component]); //Move outputPos to the end of the string while (p[outputPos] != '\0') { outputPos += 1; } //Append a dot if this is not the last digit if (component < 3) { p[outputPos++] = '.'; } } // Return length of generated string, excluding the terminating null character return outputPos; } static void ipv4_itoa(char *string, uint8_t byte) { char *baseString = string; //Write the digits to the buffer from the least significant to the most // This is the incorrect order but we will swap later do { *string++ = '0' + byte % 10; byte /= 10; } while (byte); //We put the final \0, then go back one step on the last digit for the swap *string-- = '\0'; //We now swap the digits while (baseString < string) { uint8_t tmp = *string; *string-- = *baseString; *baseString++ = tmp; } } #endif