I,ve got a task to create a copy program:
Task goes:
Write a copy program(copies simple text files) called mycopy. This utility should be adopted by the systems administrator and made available to users.
I,m running Redhat 5.2 and was wondering if i could do it as a script or a C prog.
Regards
CropA

I am not a programmer, but if they can make adduser scripts to add users to the system, I see why not to use just a script instead of C in general.

Here is a simple copy I just wrote in C. It will copy text files and binary files as well. This is copy in its most basic form. This program does not display any error messages if any of the file operations should fail.

Gary

Here it goes: copy.c

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define BUFFER_SIZE 1000
main(int argc, char * argv[] )
{
int fdIn = 0;
int fdOut = 0;
int iReadSize = 0;
int iWriteSize = 0;
char szBuffer[ BUFFER_SIZE + 1 ];

if ( argc != 3 )
printf("Usage: copy src dest\n");

fdIn = open( argv[1], O_RDONLY );
fdOut = creat( argv[2], S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );

while ( (iReadSize = read( fdIn, szBuffer, BUFFER_SIZE )) > 0 )
{
iWriteSize = write( fdOut, szBuffer, iReadSize );

} // end while

close( fdIn );
close( fdOut );
}