[C] List files in directory & macro question

[SpinningAround]

Is there a way in a linux environment to list all files in a specific directory? I wonder if it's possible in C and not C++ or C# since I studying for a course.

Macro question:
Could someone explain what this macro do?

#define DATA_REG (*(unsigned char *) 0x200 )

[dwhitney67]

You can use the combination of opendir() and then readdir() to get the contents of a directory. Don't forget to use closedir() when you are done.

As for your other question, the inner cast is treating the 0x200 as an address, and then the outer '*' is dereferencing the address so that the value at the address can be read (and if permitted, written to). If for example, the address represents a 16-bit (2-word) register, you could use the macro as such:


unsigned short value = DATA_REG;

[SpinningAround]

Thanks :D