// file: lecture_15/example.cc
//

// local include files
//
#include "example.h"

// my main program starts here
//
int main(int argc, char** argv) {

  // open the file
  //
  FILE* fp = fopen(argv[1], "r");
  if (fp == (FILE*)NULL) {
    fprintf(stdout, "%s: error opening file (%s)\n", argv[0], argv[1]);
  }

  // declare a buffer to hold one line of data
  //
  char str[MAX_LINE_LEN];

  // compute the number of lines in the file
  //
  long nlines = 0;
  while (fgets(str, MAX_LINE_LEN - 1, fp) != (char*)NULL) {
    nlines++;
  }
  fprintf(stdout, "the number of lines in %s is %d\n", argv[1], nlines);

  // rewind the file so we can read from it again
  //
  rewind(fp);

  // declare a data structure to hold the file
  //
  //  char** mstr;
  //  mstr = new char*[nlines];
  //
  char* mstr[nlines];

  // loop over all lines in the file
  //
  long linenum = 0;
  while (fgets(str, MAX_LINE_LEN - 1, fp) != (char*)NULL) {

    // allocate space: strip the newline character and adjust the length
    // of the string by decreasing it by one character
    //
    long len = strlen(str);
    str[len - 1] = (char)NULL;
    len--;

    // allocate space to hold the line - remember to allocate space for
    // the null character
    //
    mstr[linenum] = new char[len + 1];

    // copy the data
    //
    strcpy(mstr[linenum], str);

    // increment the line number
    //
    linenum++;
  }
  
  // close the file
  //
  fclose(fp);

  // print the file
  //
  for (long i = 0; i < nlines; i++) {
    fprintf(stdout, "%d: %s\n", i, mstr[i]);
  }

  // deallocate memory
  //
  while (nlines > 0) {
    nlines--;
    delete [] mstr[nlines];
  }
  //  delete [] mstr;
  
  // exit gracefully
  //
  return 0;
}