Program to copy one file into another using command line arguments?

Answer 1

#include<iostream>

#include<fstream>

#include<algorithm>

#include<string>

int copy_file (const std::string& src_name, const std::string& dst_name)

{

// Ensure source exists for input.

if (!std::ifstream (src_name).good())

{

std::cerr << "The system cannot find the file specified.\n" << std::endl;

return -1;

}

// If destination exists (for input), ask to overwrite.

if (std::ifstream (dst_name).good())

{

std::string yn;

while (!yn.size())

{

std::cerr << "The destination file exists. Overwrite? [Y/N]";

std::getline (std::cin, yn);

if (yn.size())

{

switch (yn[0])

{

case ('Y'): case ('y'): continue;

case ('N'): case ('n'): return -1;

default: yn.clear();

}

}

}

}

// Try opening or creating the destination.

std::ofstream dst (dst_name, std::ios_base::binary);

if (!dst.good())

{

std::cerr << "The destination file could not be created or opened for writing.\n" << std::endl;

return -1;

}

// Definitely good to go.

std::ifstream src (src_name, std::ios_base::binary);

std::cout << "Copying " << src_name << " to " << dst_name << std::endl;

dst << src.rdbuf();

std::cout << "\t1 file copied.\n" << std::endl;

return 0;

// Note: both files close when they fall from scope...

}

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

{

switch (argc)

{

case (3):

return copy_file (argv[1], argv[2]);

case (2):

if (std::string(argv[1])!="/?")

break;

// strip the path and extension from the command

std::string command (argv[0]);

size_t last_backslash = command.rfind ('\\') + 1;

size_t last_period = command.rfind ('.');

std::string exe = command.substr (last_backslash, last_period-last_backslash);

std::transform (exe.begin(), exe.end(), exe.begin(), ::toupper);

std::cerr << "Copies a file to another location.\n\n"

<< exe << " source destination\n\n"

"source\t\tSpecifies the file to be copied.\n"

"destination\tSpecifies the filename for the new file.\n" << std::endl;

return 0;

}

std::cerr << "The syntax of the command is incorrect.\n" << std::endl;

return -1;

}

Answer 2

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

#include<fcntl.h>

#include<dos.h>

#include<sys\stat.h>

#include<io.h>

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

{

int fp,ft,buffsize=10;

char *buff=(char *)malloc(sizeof(char)*10);

char ch;

long count=0;

int cur1,cur2;

long ret1,ret2;

clrscr();

if(argc!=3)

{

puts("wrong syntax:use the below\n");

puts("copy file1 file2\n");

puts("copy source destination");

return(1);

}

if((fp=open(argv[1],O_RDONLY|O_BINARY,S_IREAD))==-1)

{

printf("can't open the file : %s\n", argv[1]);

perror("Error no:");

return(1);

}

if((ft=open(argv[2],O_RDWR|O_CREAT|O_BINARY,S_IREAD|S_IWRITE))==-1)

{

printf("can't open the file : %s\n", argv[2]);

perror("Error no:");

close(fp);

return(1);

}

while(read(fp,buff,buffsize)==buffsize)

{

if(write(ft,buff,buffsize)!=buffsize)

{

printf("cant write to file 1\n");

perror("Error no:");

close(fp);

close(ft);

return(1);

}

count++;

}

if ( lseek(fp,0L,SEEK_END)==-1)

{

printf("lseek failed 2");

close(ft);

close(fp);

return(1);

}

cur1=tell(fp);

if(cur1 -1)

{

printf("tell failed 4");

close(ft);

close(fp);

return(1);

}

ret1=read(fp,buff,cur1-cur2);

if(ret1==-1)

{

printf("read failed 6");

close(fp);

close(ft);

return(1);

}

ret2=write(ft,buff,cur1-cur2);

if(ret2==-1)

{

printf("write failed 7");

close(fp);

close(ft);

return(1);

}

close(fp);

close(ft);

printf("\n Copying file is successfull");

return 0;

}

Answer 3

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