Re: SV: [lwip-users] Re: LWIP_PLATFORM_DIAG

[Jonathan Larmour]

Jan Wester wrote:
> Hi
> I'm not calling by myself, trying to enable standard debug output 
> In debug.h it is declared as:
[snip]
> And in lwipopts.h I try to declare:
> #define LWIP_PLATFORM_DIAG(m) {sprintf(buffer, m); \
>                                SioWriteString(2, buffer); \
>                               }
>
> SioWriteString() is my function to write to my serialport.
> LWIP_DEBUGF(debug,(("foo\n"))); This works (only format string)
> LWIP_DEBUGF(debug,(("foo=%d\n", foo))); This don't works
>
> I can't use printf becuse of library use system calls for _write()

In that case it is best to write your own alternative function to do it in 
there, e.g.:

extern int my_printf(const char *fmt, ...);
#define LWIP_PLATFORM_DIAG(m) do {my_printf m;} while(0)

and elsewhere something like:
int my_printf(const char *fmt, ...)
{
  int ret;
  va_list ap;
  va_start(ap, fmt);
  ret = vsprintf(buffer, fmt, ap);
  va_end(ap);
  SioWriteString(2, buffer);
  return ret;
}

Jifl
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