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o remove macro callPutChar() from tty_update.c, since this is no longer
needed (reported by Philippe Blain).
o add a null-pointer check in tic.c to handle the case when the input
file is really empty. Modify the next_char() function in comp_scan.c
to allow arbitrarily long lines, and incidentally supply a newline to
files that do not end in a newline. These changes improve tic's
recovery from attempts to read binary files, e.g., its output from
the terminfo database (reported by Bernhard Rosenkraenzer).
o revert change to c++/demo.cc from 20001209, which changed definition
of main() apparently to accommodate cygwin linker, but broke the demo
program.
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