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A bit wasteful, but not too intrusive.
Also remove pushback buffer limitations, as this would be mostly useless
otherwise.
Incidentally, pushback buffer overflow detection in pbstr was wrong.
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Simply put, mkstemp/unlink/rewind has the proper semantics under Unix,
and so we don't have to keep track about temp file names and remove them.
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- use err.h and kill oops,
- use __progname and kill basename,
- let indx use strstr
- proper EOS decl
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that typedef 'short'. 'char' (which was previously used) because char
may be unsigned and ((char)EOF) != EOF if that is the case. That was
causing the (char)EOF (0xff) pushed back in main to be interepreted as
a character, and, in some cases, to be written to the output. 'short'
was used rather than 'signed char' because if the latter is used,
0xff characters in the input would confuse m4. (No point in introducing
(more?) 8-bit lossage.)
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