textscan: Avoid buffer out-of-bounds errors in delimited_stream * textscan.cc (delimited_stream::get, delimited_stream::peek, delimited_stream::putback): Check for eof before advancing, rewinding, or dereferencing the pointer into the stream buffer.

273589d5bdbf4d34ea0c458bcfdfe2fb7a457457 gnulib-hg