The code is carefully segregated into a system independent portion and a system dependent portion. The system dependent code is in the `unix' subdirectory, and also in the file `sysh.unx' (also known as `sysdep.h').
With the right configuration parameters, the system independent code
calls only ANSI C functions. Some of the less common ANSI C functions
are also provided in the `lib' directory. The replacement function
strtol in `lib/strtol.c' assumes that the characters A
to F and a to f appear in strictly sequential order.
The function igradecmp in `uuconf/grdcmp.c' assumes that the
upper and lower case letters appear in order. Both assumptions are true
for ASCII and EBCDIC, but neither is guaranteed by ANSI C. Disregarding
these caveats, I believe that the system independent portion of the code
is strictly conforming.
That's not too exciting, since all the work is done in the system dependent code. I think that this code can conform to POSIX 1003.1, given the right compilation parameters. I'm a bit less certain about this, though.
The code has been used on a 16 bit segmented system with no function prototypes, so I'm fairly certain that all casts to long and pointers are done when necessary.
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