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Once upon a time Upas ran on many versions of Unix.
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This is a partial rewrite to ANSI C specifically for Plan 9.
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It uses's Plan 9's bio library instead of stdio and Plan 9's
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regular expression library.
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I've tried to make portability possible but it has
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never been ported. To port Upas to another system:
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- port Plan 9's libbio library working on that system (already available).
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- port Plan 9's regexp library working on that system (should just compile).
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- rewrite common/libsys.c to reflect system calls for that system. This
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file contains all the really system dependent code that differs between
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Plan 9 and each Unix. This includes file management, signal
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handling, process control and error handling.
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- change the important directory trees in common/mail.c to reflect
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where you want things like
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- get the ARGBEGIN/ARGEND/ARGF macros from Plan 9's libc.h
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- get the include files correct in common/sys.h
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- rewrite smtp/mxdial to use the conventions of that system
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- rewrite runq.c to walk queues on that system.
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