Is there a way to copy or append something to the end of a string?
What I specificly want to do is to get the current directory with getwd() (or with pwd using fork(), whatever suits my project best) and then append/copy a filename to the path. I'm sure there's a simple way to do to this. Can anyone help?
strcat( )
Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah
You. Fetch me my copy of the Wall Street Journal. You two, fight to the death - Stewie
strcat( )
** edit **
Rats! You beat me.
The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.
Wow, didn't take more than one minute to get a reply. Thanks.
A feel a bit stupid for not knowing about strcat(), though.
Here's a good reference: http://cppreference.com/
Its got a list of all such string functions, and other Standard Library functions (for both C and C++).
The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.
Thank you, Zach, a very good list indeed. Bookmarked it.
Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah
You. Fetch me my copy of the Wall Street Journal. You two, fight to the death - Stewie
Bookmarked that one too, thanks.
Edit:
Another problem in my project has come up (related to the previous one, that's why I'm not creating a new thread). I got strcat() to work, and I'm using:
The problem is my file, 'input_file.txt' is empty. My guess is that the second array is failing, but how can I make the '>>' to work?Code:// added the / in the filename to make it work strcat(¤tDir, fileName); [...] // the using the variable in an array char *argv1[] = {"touch", "input_file.txt", NULL}; char *argv2[] = {"cat", setPath, ">>", ¤tDir, NULL}; [...] // using the arrays in the child process execve("/usr/bin/touch", argv1, NULL); execve("/bin/cat", argv2, NULL);
Last edited by kristy; 07-18-2003 at 04:50 PM.
I know, but as i.e. char *argv[] = {"ping", "-c 5", ping_host, NULL}; is equal to 'ping -c 5 apple.com' (if ping_host is set to apple.com that is) it should work, at least in theory (at least in my theoryOriginally posted by Salem
Shell redirections like >> are handled by the shell, not exec level functions.
My code looks like this (and works):> strcat(¤tDir, fileName);
Your use of & is unusual - how did you declare currentDir?If this is bad code (or a bad idea to solve it), please let me know.Code:char *fileName = { "/input_file.txt" }; char currentDir; getwd(¤tDir); strcat(¤tDir, fileName);
Thanks for pointing that out. My array did work as it should, though, but it really doesn't matter if it's still done the wrong way..Originally posted by Salem
The shell assigns each word of a command line to a separate argv, so ping -c 5 apple.com would be
char *argv[] = {"ping", "-c", "5", ping_host, NULL};
Ouch, yes I am. (How could I not see that..) I applied your code to my project, thank you. What can overwriting memory like I did do to the system in the long run, btw?Yeah - you're overwriting memory you don't own
Do you mean from my code, or the function's return values?Does getwd() return an error of any sort?
Last edited by kristy; 07-19-2003 at 03:51 AM.
According to the man page for getwd() (and getcwd() - which apparently should be used instead, as getwd() is for FreeBSD compatibility only) a pointer to the pathname is returned upon successful completion. If it fails a NULL pointer is returned. The functions also has five error macros EACCES, EINVAL, ENOENT, ENOMEM and ERANGE.
*can't live without man pages*
