AsciiStringParsingUtils/Src/AsciiStringParsingUtils.c

//
// Created by xemon on 10.09.22.
//

#include "AsciiStringParsingUtils.h"
#include <stdlib.h>
#include <string.h>

uint8_t iAsciiStringParseCharToDecimalInt(char symbol) {
    return (symbol - '0'); // return overvalue if not a decimal number
}

uint8_t iAsciiStringParseHexCharToInt(char symbol) {
    if (symbol >= '0' && symbol <= '9') {
        return iAsciiStringParseCharToDecimalInt(symbol);
    } else if (symbol >= 'a' && symbol <= 'f') {
        return 0xA + symbol - 'a';
    } else if (symbol >= 'A' && symbol <= 'F') {
        return 0xA + (symbol - 'A');
    } else {
        return 0x10; //not a hex number, return overvalue
    }
}


uint8_t iAsciiStringParseHexByte(const char *str) {
    return iAsciiStringParseHexCharToInt(*str) * 0x10 + iAsciiStringParseHexCharToInt(*(str + 1));
}

size_t iAsciiStringParseHexBytes(uint8_t *bytesData, char *str, size_t stringLen) {
    char *end = str + stringLen;

    size_t dataLen = stringLen / 2;

    while (end > str) {

        *bytesData = iAsciiStringParseHexByte(str);

        str += 2;
        ++bytesData;
    }

    return dataLen;
}

uint64_t iAsciiStringParseUIntDecimalNumberWhitEnd(char **str, const char *strEnd) {


    uint32_t value = 0;
    uint8_t digit;

    while ((*str) < strEnd) {
        digit = iAsciiStringParseCharToDecimalInt(**str);
        if (digit > 9) {
            return value;
        } else {
            value = (value * 10) + digit;
        }
        ++(*str);
    }

    return value;
}

int64_t iAsciiStringParseSignedLongDecimalNumber(char *str, const char *strEnd) {
    int8_t sign = 1;
    if (*str == '-') {
        sign = -1;
        ++str;
    }

    return iAsciiStringParseUIntDecimalNumberWhitEnd(&str, strEnd) * sign;
}

uint64_t iAsciiStringParseUnsignedLongDecimalNumber(char *str, const char *strEnd) {
    return iAsciiStringParseUIntDecimalNumberWhitEnd(&str, strEnd);
}


char *xAsciiStringSkipChar(char *utcString, char const *utcStringEnd, char symbol) {
    while ((utcString < utcStringEnd) && (*utcString == symbol)) {
        ++utcString;
    }
    return utcString;
}

char *xAsciiStringSeekChar(char *utcString, char const *utcStringEnd, char symbol) {
    while ((utcString < utcStringEnd) && (*utcString != symbol)) {
        ++utcString;
    }
    return utcString;
}

double dAsciiStringParseDouble(char *str, const char *strEnd) {
    double sign = 1;
    if (str[0] == '-') {
        sign = -1;
        ++str;
    }
    char *dividerSymbol = xAsciiStringSeekChar(str, strEnd, '.');

    double result = iAsciiStringParseUnsignedLongDecimalNumber(str, dividerSymbol);

    if (dividerSymbol < (strEnd - 1)) {
        ++dividerSymbol;
        char *fractionalStr = dividerSymbol;
        double fractional = iAsciiStringParseUIntDecimalNumberWhitEnd(&fractionalStr, strEnd);

        for (; dividerSymbol < fractionalStr; ++dividerSymbol) {
            fractional /= 10;
        }
        result += fractional;
    }


    return result * sign;
}

uint8_t iAsciiStringMoveToNextParsingBlock(char **blockBeginPos, char **blockDividerPos, char *strEnd, char divider) {
    *blockBeginPos = xAsciiStringSkipSpace((*blockDividerPos + 1), strEnd);
    *blockDividerPos = xAsciiStringSeekChar(*blockBeginPos, strEnd, divider);
    return *blockDividerPos - *blockBeginPos; //return block length
}