[lwip-users] LWIP_DEBUGF

[Bernhard 'Gustl' Bauer]

Hi,

I cannot use a printf for the output. The only possibility for me is to 
use sprintf and write it to a part in the memory.

LWIP_DEBUGF is often used to get some variables along. So there a 
brackets () around the printf part:
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
        ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif,
        netif->name[0], netif->name[1], (u16_t)netif->num));

To use this with sprintf I have to get a string pointer inside the 
brackets. I added a '#define LWIP_DEBUG_F str_ptr,' and changed all 
LWIP_DEBUGF similar to this:
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, (LWIP_DEBUG_F
        "dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif,
        netif->name[0], netif->name[1], (u16_t)netif->num));

Is there any better way to do this? I like to avoid all the changes I 
have to do every time I change LWIP version.

TIA

Gustl