Created
April 3, 2019 15:11
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Utility functions to map common file inputs to vectors
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| #include <bits/stdc++.h> | |
| #include <string> | |
| #include <fstream> | |
| #include <sstream> | |
| #include <algorithm> | |
| using namespace std; | |
| long int n_buffers, buffer_size, output_offset; | |
| string input_buffer; | |
| vector<int> int_tokens; | |
| vector<string> input_tokens; | |
| void extractInt(string str) { | |
| stringstream ss; | |
| ss << str; | |
| string temp; | |
| int found; | |
| while (!ss.eof()) { | |
| ss >> temp; | |
| if (stringstream(temp) >> found) int_tokens.emplace_back(found); | |
| temp = ""; | |
| } | |
| } | |
| void processInput(istream &input) { | |
| string buffer(buffer_size, 0); | |
| int _iter = 0; | |
| while (!input.eof() and _iter < n_buffers - 1) { | |
| input.read(buffer.data(), buffer.size()); | |
| vector<char> del_chars = {'\n', 'I', 'N', 'D', 'O', 'U', 'T', 'A', 'G', 'E'}; | |
| for(auto ch: del_chars) buffer.erase(remove(buffer.begin(), buffer.end(), ch), buffer.end()); | |
| input_buffer.insert(input_buffer.end(), buffer.begin(), buffer.end()); | |
| _iter++; | |
| } | |
| output_offset = input.tellg(); | |
| extractInt(input_buffer); | |
| vector<char> del_nos = {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-'}; | |
| for(auto ch: del_nos) input_buffer.erase(remove(input_buffer.begin(), input_buffer.end(), ch), input_buffer.end()); | |
| istringstream temp_buf(input_buffer); | |
| input_tokens = vector<string>(istream_iterator<string>{temp_buf}, | |
| istream_iterator<string>()); | |
| } | |
| signed main() { | |
| n_buffers = atoi(argv[2]), buffer_size = atoi(argv[3]); | |
| ifstream fin(argv[1], ifstream::binary); | |
| processInput(fin); | |
| fin.close(); | |
| ofstream fout(argv[1], ios::out | ios::app); | |
| if(output_offset < 0) | |
| fout.seekp(0, ios::end); | |
| else | |
| fout.seekp(output_offset, ios::beg); | |
| auto output = process(int_tokens, input_tokens); // should return ostringstream | |
| cout<<output.str(); | |
| fout<<output.str(); // if ostringstream and not str | |
| fout.close(); | |
| } | |
| } |
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