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Add -i option to the cp code - please help to add that feature to code

//$ cp file1 file2 =will destroy the original contents of file2
//$ cp file1 -i files =ask you before writing over a file
//this code is written for SUN OS

/** cp1.c
* version 1 of cp - uses read and write with tunable buffer size
*
* usage: cp1 src dest
*
*/
#include
#include
#include

#define BUFFERSIZE 4096
#define COPYMODE 0644

void oops(char *, char *);

main(int ac, char *av[])
{
int in_fd, out_fd, n_chars;
char buf[BUFFERSIZE];
/* check args */
if ( ac != 3 ){
fprintf( stderr, "usage: %s source destination
", *av);
exit(1);
}
/* open files */

if ( (in_fd=open(av[1], O_RDONLY)) == -1 )
oops("Cannot open ", av[1]);

if ( (out_fd=creat( av[2], COPYMODE)) == -1 )
oops( "Cannot creat", av[2]);

/* copy files */

while ( (n_chars = read(in_fd , buf, BUFFERSIZE)) > 0 )
if ( write( out_fd, buf, n_chars ) != n_chars )
oops("Write error to ", av[2]);
if ( n_chars == -1 )
oops("Read error from ", av[1]);

/* close files */

if ( close(in_fd) == -1 || close(out_fd) == -1 )
oops("Error closing files","");
}

void oops(char *s1, char *s2)
{
fprintf(stderr,"Error: %s ", s1);
perror(s2);
exit(1);
}


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