CS3013Proj2/proj2.cpp at main · AMarkenson/CS3013Proj2 · GitHub

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#include <iostream>
using namespace std;
#include <cstring>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <typeinfo>


extern char **environ;

void readFile(int fdIn, int buffer, int &total, int &ascii, int &upper, int &lower, int &digit, int &space) {
    char* buf = new char[buffer];
    ssize_t bytesRead;
    while ((bytesRead = read(fdIn, buf, buffer)) > 0) {
        total += bytesRead;
        for (ssize_t i = 0; i < bytesRead; ++i) {
            unsigned char c = buf[i];
            if (c < 128) {
                ascii++;
                if (isupper(c)) upper++;
                else if (islower(c)) lower++;
                else if (isdigit(c)) digit++;
                else if (isspace(c)) space++;
            }
        }
    }
    delete[] buf;
    if (bytesRead < 0) {
        cerr << "Error reading file." << endl;
        exit(1);
    }
}


int main(int argc, char* argv[]) {
    bool no_mmap = true;
    bool use_processes = false;
    int buffer = 1024;
    int fdIn;
    int total = 0;
    int ascii = 0;
    int upper = 0;
    int lower = 0;
    int digit = 0;
    int space = 0;

    if (argc < 2) {
        fdIn = 0; // stdin
    } else if ((fdIn = open(argv[1], O_RDONLY)) < 0) {
        cerr << "Error opening file: " << argv[1] << endl;
        exit(1);
    }


    if(argc > 2) {
        if(atoi(argv[2]) != 0) {
            buffer = atoi(argv[2]);
            if (buffer <= 0) {
                cerr << "Buffer size must be a positive integer." << endl;
                exit(1);
            }
            if (buffer > 8192) {
                cerr << "Buffer size must not exceed 8192 bytes." << endl;
                exit(1);
            }
        } else if(strcmp(argv[2], "mmap") == 0) {
            no_mmap = false;
            struct stat sb;
            if (fstat(fdIn, &sb) == -1) {
                cerr << "Error getting file size." << endl;
                exit(1);
            }
            size_t file_size = sb.st_size;
            total = file_size;
            char* fileptr;
            if ((fileptr = static_cast<char*>(mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, fdIn, 0))) == MAP_FAILED) {
                cerr << "Error mapping file." << endl;
                exit(1);
            }

            //cout << "Using mmap for file size: " << file_size << " bytes" << endl;

            for (size_t i = 0; i < total; ++i) {
                unsigned char c = fileptr[i];
                if (c < 128) {
                    ascii++;
                    if (isupper(c)) upper++;
                    else if (islower(c)) lower++;
                    else if (isdigit(c)) digit++;
                    else if (isspace(c)) space++;
                }
            }
            munmap(fileptr, total);
        } else if (argv[2][0] == 'p') {
            use_processes = true;
            no_mmap = false;
            argv[2]++;
            int num_processes = atoi(argv[2]);
            if (num_processes <= 0) {
                cerr << "Number of processes must be a positive integer." << endl;
                exit(1);
            }
            if (num_processes > 16) {
                cerr << "Number of processes must not exceed 16." << endl;
                exit(1);
            }
            struct stat sb;
            if (fstat(fdIn, &sb) == -1) {
                cerr << "Error getting file size." << endl;
                exit(1);
            }
            size_t file_size = sb.st_size;
            size_t chunk_size = file_size / num_processes;
            pid_t pids[num_processes];
            int pipefd[num_processes][2];
            for (int i =0; i < num_processes; ++i) {
                if (pipe(pipefd[i]) == -1) {
                    cerr << "Error creating pipe." << endl;
                    exit(1);
                }
                if ((pids[i] = fork()) < 0) {
                    cerr << "Error forking process." << endl;
                    exit(1);
                } else if (pids[i] == 0) { // Child process
                    close(pipefd[i][0]); // Close read end
                    int local_total = 0, local_ascii = 0, local_upper = 0, local_lower = 0, local_digit = 0, local_space = 0;
                    size_t start = i * chunk_size;
                    size_t end = (i == num_processes - 1) ? file_size : start + chunk_size;
                    lseek(fdIn, start, SEEK_SET);
                    size_t to_read = end - start;
                    char* buf = new char[to_read];
                    ssize_t bytesRead = read(fdIn, buf, to_read);
                    if (bytesRead < 0) {
                        cerr << "Error reading file in child process." << endl;
                        exit(1);
                    }
                    local_total += bytesRead;
                    for (ssize_t j = 0; j < bytesRead; ++j) {
                        unsigned char c = buf[j];
                        if (c < 128) {
                            local_ascii++;
                            if (isupper(c)) local_upper++;
                            else if (islower(c)) local_lower++;
                            else if (isdigit(c)) local_digit++;
                            else if (isspace(c)) local_space++;
                        }
                    }
                    delete[] buf;
                    cout << "Process " << i << " (PID " << getpid() << "): ascii: " << local_ascii << ", upper: " << local_upper << ", lower: " << local_lower << ", digit: " << local_digit << ", space: " << local_space << " out of " << local_total << " bytes" << endl;
                    write(pipefd[i][1], &local_total, sizeof(local_total));
                    write(pipefd[i][1], &local_ascii, sizeof(local_ascii));
                    write(pipefd[i][1], &local_upper, sizeof(local_upper));
                    write(pipefd[i][1], &local_lower, sizeof(local_lower));
                    write(pipefd[i][1], &local_digit, sizeof(local_digit));
                    write(pipefd[i][1], &local_space, sizeof(local_space));
                    close(pipefd[i][1]);
                    exit(0);
                } else { // Parent process
                    close(pipefd[i][1]); // Close write end
                }
            }
        }
    }
    if(no_mmap) {
        cout << "Using read with buffer size: " << buffer << " bytes" << endl;
        readFile(fdIn, buffer, total, ascii, upper, lower, digit, space);
    }
    if (fdIn > 0) {
        close(fdIn);
    }
    if (!use_processes) cout << "ascii: " << ascii << ", upper: " << upper << ", lower: " << lower << ", digit: " << digit << ", space: " << space << " out of " << total << " bytes" << endl;
}