myWc.cpp

/**********************************************
 * Last Name:   Golovin
 * First Name:  Artem
 * Student ID:  30018900
 * Course:      CPSC 457
 * Tutorial:    T05
 * Assignment:  1
 * Question:    Q5
 *
 * File name:   myWc.cpp
 *********************************************/

#include <fcntl.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

using namespace std;

const size_t CHAR_BUFFER_SIZE = 256;

int main(int argc, char *const argv[]) {
  // get the file name from command line
  string filename;
  if (argc != 2) {
    cerr << "Usage: readFile <input file> " << endl;
    return -1;
  } else {
    filename = argv[1];
  }

  // open the file for reading
  int fd = open(filename.c_str(), O_RDONLY);
  if (fd < 0) {
    cerr << "Could not open file " << filename << "\n";
    exit(-1);
  }

  // read file character by character and count lines
  char char_buffer[CHAR_BUFFER_SIZE];
  int lines = 0;

  while (true) {
    ssize_t bytes_read = read(fd, &char_buffer, CHAR_BUFFER_SIZE);

    if (bytes_read <= 0) {
      break;
    }

    for (int i = 0; i < bytes_read; i++) {
      if (char_buffer[i] == '\n') {
        lines++;
      }
    }
  }

  // close file and report results
  close(fd);
  cout << lines << " " << filename << "\n";
  return 0;
}