Oops, never mind, it looks like you have already analyzed yy_scan_byte
and found it calls yy_scan_buffer internally (!!!). Oh well.
David Herrmann wrote:
Internally, we depend on yy_scan_{string,byte}() helpers. According to
flex documentation these already copy the input string because they are
wrappers around yy_scan_buffer().
yy_scan_buffer() on the other hand has some insane requirements. The
buffer must be writeable and the last two bytes must be ASCII-NUL. But the
buffer may contain other 0 bytes just fine.
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