monero_c/libbridge/src/main/cpp/helpers.cpp

#include <inttypes.h>
#include <unistd.h>
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include <vector>
#include <string>
#include "helpers.hpp"
#include <set>
#include <sstream>
#include <cstring>

const char* vectorToString(const std::vector<std::string>& vec, const std::string separator) {
    // Concatenate all strings in the vector
    std::string result;
    for (const auto& str : vec) {
        result += str;
        result += separator;
    }
    const char* cstr = result.c_str();
    return cstr;
}

const char* vectorToString(const std::vector<uint32_t>& vec, const std::string separator) {
    // Calculate the size needed for the result string
    size_t size = 0;
    for (size_t i = 0; i < vec.size(); ++i) {
        // Calculate the number of digits in each element
        size += snprintf(nullptr, 0, "%u", vec[i]);
        // Add comma and space for all elements except the last one
        if (i < vec.size() - 1) {
            size += separator.size(); // comma and space
        }
    }

    // Allocate memory for the result string
    char* result = static_cast<char*>(malloc(size + 1));
    if (result == nullptr) {
        // Handle memory allocation failure
        return nullptr;
    }

    // Fill in the result string
    char* current = result;
    for (size_t i = 0; i < vec.size(); ++i) {
        // Convert each element to string and copy to the result string
        int written = snprintf(current, size + 1, "%u", vec[i]);
        current += written;
        // Add comma and space for all elements except the last one
        if (i < vec.size() - 1) {
            strcpy(current, separator.c_str());
            current += separator.size();
        }
    }

    return result;
}

const char* vectorToString(const std::vector<uint64_t>& vec, const std::string separator) {
    // Calculate the size needed for the result string
    size_t size = 0;
    for (size_t i = 0; i < vec.size(); ++i) {
        // Calculate the number of digits in each element
        size += snprintf(nullptr, 0, "%lu", vec[i]);
        // Add comma and space for all elements except the last one
        if (i < vec.size() - 1) {
            size += separator.size(); // comma and space
        }
    }

    // Allocate memory for the result string
    char* result = static_cast<char*>(malloc(size + 1));
    if (result == nullptr) {
        // Handle memory allocation failure
        return nullptr;
    }

    // Fill in the result string
    char* current = result;
    for (size_t i = 0; i < vec.size(); ++i) {
        // Convert each element to string and copy to the result string
        int written = snprintf(current, size + 1, "%lu", vec[i]);
        current += written;
        // Add comma and space for all elements except the last one
        if (i < vec.size() - 1) {
            strcpy(current, separator.c_str());
            current += separator.size();
        }
    }

    return result;
}

const char* vectorToString(const std::vector<std::set<uint32_t>>& vec, const std::string separator) {
    // Check if the vector is empty
    if (vec.empty()) {
        return "";
    }

    // Use a stringstream to concatenate sets with commas and individual elements with spaces
    std::ostringstream oss;
    oss << "{";
    for (auto it = vec.begin(); it != vec.end(); ++it) {
        if (it != vec.begin()) {
            oss << separator;
        }

        oss << "{";
        for (auto setIt = it->begin(); setIt != it->end(); ++setIt) {
            if (setIt != it->begin()) {
                oss << separator;
            }
            oss << *setIt;
        }
        oss << "}";
    }
    oss << "}";
    std::string str = oss.str();
    const std::string::size_type size = str.size();
    char *buffer = new char[size + 1];   //we need extra char for NUL
    memcpy(buffer, str.c_str(), size + 1);
    return buffer;
}

// Function to convert std::set<uint32_t> to a string
const char* vectorToString(const std::set<uint32_t>& intSet, const std::string separator) {
    // Check if the set is empty
    if (intSet.empty()) {
        return "";
    }

    // Use a stringstream to concatenate elements with commas
    std::ostringstream oss;
    auto it = intSet.begin();
    oss << *it;
    for (++it; it != intSet.end(); ++it) {
        oss << ", " << *it;
    }

    std::string str = oss.str();
    const std::string::size_type size = str.size();
    char *buffer = new char[size + 1];   //we need extra char for NUL
    memcpy(buffer, str.c_str(), size + 1);
    return buffer;
}