0x15. C File I O TASK 03 - humtej1204/holbertonschool-low_level_programming GitHub Wiki

3. cp

mandatory

Write a program that copies the content of a file to another file.

  • Usage: cp file_from file_to
  • if the number of argument is not the correct one, exit with code 97 and print Usage: cp file_from file_to, followed by a new line, on the POSIX standard error
  • if file_to already exists, truncate it
  • if file_from does not exist, or if you can not read it, exit with code 98 and print Error: Can't read from file NAME_OF_THE_FILE, followed by a new line, on the POSIX standard error
    • where NAME_OF_THE_FILE is the first argument passed to your program
  • if you can not create or if write to file_to fails, exit with code 99 and print Error: Can't write to NAME_OF_THE_FILE, followed by a new line, on the POSIX standard error
    • where NAME_OF_THE_FILE is the second argument passed to your program
  • if you can not close a file descriptor, exit with code 100 and print Error: Can't close fd FD_VALUE, followed by a new line, on the POSIX standard error
    • where FD_VALUE is the value of the file descriptor
  • Permissions of the created file: rw-rw-r--. If the file already exists, do not change the permissions
  • You must read 1,024 bytes at a time from the file_from to make less system calls. Use a buffer
  • You are allowed to use dprintf
julien@ubuntu:~/0x15. File descriptors and permissions$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 3-cp.c -o cp
julien@ubuntu:~/0x15. File descriptors and permissions$ cat incitatous 
Why you should think twice before putting pictures on social media.
(What you always wanted to know about @Incitatous)
#PrivacyAware
http://imgur.com/a/Mq1tc
julien@ubuntu:~/0x15. File descriptors and permissions$ ./cp incitatous Incitatous
julien@ubuntu:~/0x15. File descriptors and permissions$ ls -l Incitatous 
-rw-rw-r-- 1 julien julien 158 Dec  3 15:39 Incitatous
julien@ubuntu:~/0x15. File descriptors and permissions$ cat Incitatous 
Why you should think twice before putting pictures on social media.
(What you always wanted to know about @Incitatous)
#PrivacyAware
http://imgur.com/a/Mq1tc
julien@ubuntu:~/0x15. File descriptors and permissions$

Repo:

  • GitHub repository: holbertonschool-low_level_programming
  • Directory: 0x15-file_io
  • File: 3-cp.c