Eventually, dprintf might be conjuncted with logging facilities such as something in entangle. I would expect there is no direct call to printf.

Lower-case dprintf is better than the opposite form DPRINTF.

Eventually, dprintf might be conjuncted with logging facilities such as something in entangle. I would expect there is no direct call to printf.

I guess it will be left to the future modification?

We can proceed at the moment since it could be involved in small chunks of changes.

I found the logging function of entangled: log_debug()

static inline void dprintf(...) {
#if defined(ENABLE_DEBUG)
    log_debug();
#endif
}

void log_debug() {
    // The current dcurl implementation would be printf()
    // In the future,
    // it might be integrated with other logging facilities like entangled
    printf(...);
}

Is this what you expected to see?

selftest programs inside Linux kernel tree come with a nice example for writing dprintf: https://github.com/torvalds/linux/blob/master/tools/testing/selftests/x86/pkey-helpers.h

Since dprintf() has been declared in stdio.h, I rename it to dbgprintf() instead.