[GNUnet-developers] [patch] add GNUNET_append_printf function

[Andrew Cann]

This patch adds a function which realloc()s a string and prints to the end of
it. Useful for building up strings when you don't know how large a buffer to
allocate beforehand.

I've also added the format(printf) __attribute__ to this and the other *printf
functions.

 - Andrew

GNUNET_append_sprintf.diff
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