Thread: Problem with a text macro.

Hi,

Just found out about preprocessor macros, and was trying to create a popen command that would include a changing directory.

I tried the following:

Code:

#define COMMAND(dir) "find " #dir " -type f -printf '%T@ %t %p\\n' | sort -k 1 -nr | rev | cut -d' ' -f1 | rev"

And it does what I need with the following:

Code:

printf("%s\n", COMMAND("/home/user/directory"));

But I'm now trying to use a '#define' as the argument for the macro, but it just uses the NAME rather than the value:

Code:

printf("%s\n", COMMAND(DIRECTORY));

Prints:

Code:

find DIRECTORY -type f -printf '%T@ %t %p\n' | sort -k 1 -nr | rev | cut -d' ' -f1 | rev

Instead of:

Code:

find "/home/user/directory" -type f -printf '%T@ %t %p\n' | sort -k 1 -nr | rev | cut -d' ' -f1 | rev

What am I doing wrong? Is this even possible?

Yes, that worked, but I found the following:

Code:

#define COMMAND(dir) "find " dir " -type f -printf '%T@ %t %p\\n' | sort -k 1 -nr | rev | cut -d' ' -f1 | rev"

Includes the double quotes around the directory name (which I wasn't really concrened with, but is nice to have). It's without the pound symbol (#).

Other than the double quotes being included, is there anything I need to be aware of if I choose to use "dir" without the preceeding pound symbol. Or is it safer to use STR(dir)?