Chapter 10, Problem 10.10HW

Explanation of Solution

Modified code from figure 10.5:

The modified code for “cpfile.c” is shown below:

//Include header file

#include <stdio.h>

#include "csapp.h"

//Main function

int main(int argc, char* argv[])

{

  //Declare "int" variable

  int n;

  //Create the object for read buffer of type

  rio_t rio;

  //Declare "MAXLINE" for memory

  char buf[MAXLINE];

/* Check the command line arguments. If the command line contains two argument, then copy the infile to standard output */

  if (argc == 2)

  {

    /* Store the descriptor number in "fd" */

    int fd = Open(argv[1], O_RDONLY, 0);

    while ((n = Rio_readn(fd, buf, MAXBUF)) != 0)

      Rio_writen(STDOUT_FILENO, buf, n);

    //Exit the process

    exit(0);

  }

/* Otherwise copy a text file from standard input to...