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