* R0 = 0, or pointer to state block
R1 = program name (argv[0]), if R2b5 clear
R2 = flags
* If input R0 = 0:
R0 = size of the state block
Else:
State block is filled in
Initialise the state block ready for MDWOpt_ReadArgs.
If input R0 = 0, then find and return the amount of space required for the state block; it is up to the calling program to claim a block of this size and set it to all 0s (optionally setting block®err non-zero), then call MDWOpt_InitArgs again, with R0 pointing to the block.
If input R0 ¹ 0, then the state block is filled in according to the input R1 and R2. If R2b4 is set and R2b5 is clear, then the environment variable PROGRAM$Options (failing that, PROGRAM) is read; PROGRAM is the leafname part of the string pointed to by R1. Note that this call does not fill the block with 0s for you.
MDWOpt_InitArgs R2 flags
bits /meaning/
0..3 ignored
4 set if to read environment variable (needs program name)
5 set if no program name is supplied
6 ignored
7..31 reserved; set to 0
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