Function silc_buffer_push_tail
SYNOPSIS
static inline
unsigned char *silc_buffer_push_tail(SilcBuffer sb, SilcUInt32 len);
DESCRIPTION
Pushes current tail section towards beginning. Length of the current
valid data area is also decremented. Returns a pointer to the
tail section before pushing. Returns NULL on error.
EXAMPLE
---------------------------------
| head | data | tail |
---------------------------------
^
Pushes the start of the tail section.
---------------------------------
| head | data | tail |
---------------------------------
^
silc_buffer_push_tail(sb, 23);
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