Sed question

gjbanton · #1 (**permalink**) 04-20-2009

Hi All,

Let's say I have a C file such as follows:

Code:

#include <stdio.h>

#if DEFINED 
#define EFG 1
int foo()
{
    return 0;
}

// comment here
/* comment here */
#elif _NOT_DEFINED
#define ABC 0
int boo()
{
    return 0;
}

#else
void zoo()
{
    // nothing here
}
#endif 

int main()
{
    return 0;
}

Using sed (or any other widely used scripting tool), I want to modify the C file to look something like this:

Code:

#include <stdio.h>

#if DEFINED 
#define EFG 1
int foo()
{
    return 0;
}

// comment here
/* comment here */
#endif 

int main()
{
    return 0;
}

Basically, I want to remove the code that falls under _NOT_DEFINED or else blocks (equivalent of #if 0 blocks). Any ideas?

Thanks in advance.

vino · #2 (**permalink**) 04-21-2009

Why dont you use the C Processor utility i.e. cpp. Look at man cpp for more details.

Code:

/usr/bin/cpp -D DEFINED main.cpp

This would print out the contents of stdio.h as well.

gjbanton · #3 (**permalink**) 04-21-2009

Unfortunately this is not the option for me. Preprocessing option is not feasible due to cross-compilation and modular build, hence I have to resort to scripting.

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