System Calls using C w/BASH Post: 302611817

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Top Forums Programming System Calls using C w/BASH Post 302611817 by pflynn on Friday 23rd of March 2012 02:40:37 PM

03-23-2012

Registered User

I would suggest you prefer strncat to strcat. strncat is the secure sister of strcat:

Quote:

char * strncat ( char * destination, char * source, size_t num ); Append characters from string
Appends the first num characters of source to destination, plus a terminating null-character. If the length of the C string in source is less than num, only the content up to the terminating null-character is copied.

strncat - C++ Reference

usage of strncat is the same as strcat. The only difference is that strncat has an aditional third argument, that you use to tell the function the maximum amount of characters that should be copied to the destination buffer. This is very important to prevent your programs being vulnerable to buffer overflow errors.

Code:

for (i = 1; i < argc; i++)
    {
        strncat(theCommand, argv[i], sizeof(theCommand) - 1);
    }

Last edited by Corona688; 03-23-2012 at 03:44 PM.. Reason: horizontally stretching the window

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LEARN ABOUT DEBIAN

xclip-copyfile

XCLIP-COPYFILE(1)					      General Commands Manual						 XCLIP-COPYFILE(1)

NAME

       xclip-copyfile, xclip-cutfile, xclip-pastefile - copy and move files via the X clipboard

SYNOPSIS

       xclip-copyfile [-p] FILES...

       xclip-cutfile [-p] FILES...

       xclip-pastefile

DESCRIPTION

       xclip-copyfile copies files into the X clipboard, recursing into directories.

       xclip-cutfile copies the files, but also deletes them afterwards.

       -p     preserve path formation

       xclip-pastefile pastes the files out of the clipboard

EXAMPLES

       Copying a file to a remote host

       [maggie.lkpg.cendio.se ~]$ echo "A file created on ${HOSTNAME}" > file1
       [maggie.lkpg.cendio.se ~]$ xclip-copyfile file1
       [sofie.homeip.net ~/doc]$ xclip-pastefile
       file1
       [sofie.homeip.net ~/doc]$ cat file1
       A file created on maggie.lkpg.cendio.se

       Copying an entire tree structure

       [sofie.homeip.net ~]$ xclip-copyfile doc
       [maggie.lkpg.cendio.se ~/tmp]$ xclip-pastefile
       doc/
       doc/letter-mom-april.txt
       doc/file1
       doc/letter-dad-march.txt

       Copying files with preserved path information

       [maggie.lkpg.cendio.se ~]$ xclip-copyfile -p /etc/sysconfig/grub
       tar: Removing leading `/' from member names
       [sofie.homeip.net ~/tmp]$ xclip-pastefile
       etc/sysconfig/grub
       [sofie.homeip.net ~/tmp]$ ls etc/sysconfig/grub
       etc/sysconfig/grub

       Moving files

       [sofie.homeip.net ~]$ ls letter-brother-may.txt
       letter-brother-may.txt
       [sofie.homeip.net ~]$ xclip-cutfile letter-brother-may.txt
       [sofie.homeip.net ~]$ ls letter-brother-may.txt
       ls: cannot access letter-brother-may.txt: No such file or directory
       [sofie.homeip.net ~]$ cd doc
       [sofie.homeip.net ~/doc]$ xclip-pastefile
       letter-brother-may.txt

AUTHORS

       This  manual  page  was written by Maximilian Gass <mxey@cloudconnected.org> for the Debian project. It may be used for everything else, of
       course.

																 XCLIP-COPYFILE(1)

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