* R0 = number of command line arguments
R1 = arguments block
R2 = short options descriptor string
R3 = long options descriptor block
R4 = state block (as set up by MDWOpt_InitArgs)
R5 = flags
* R0 = preserved, or error if V set
R1 = meaning of option
R2 = long option index, or -1
R3 = number (if R0 indicates 'number')
R4 = pointer to parameter string (if the option has one)
R5 = index of next argument
Reads options. This is intended to be equivalent to standard getopt implementations, although it provides many more features even than the standard GNU implementation.
The precise manner of options parsing is determined by various flag settings, which is described in the section How programs parse options. By setting flag values appropriately, you can achieve behaviour very similar to most other getopt routines.
MDWOpt_ReadArgs R5 flags
bits /meaning/
0 set if no long options (R3 ignored)
1 set if no short options (R2 ignored)
2 set if to allow numeric options ("-1" etc.)
3 set if '+' is allowed to negate option arguments
4 set if to parse environment variable (if b5 clear)
5 set if no program name is supplied
6 set if to allow negated number options ("--1" etc.)
MDWOpt_ReadArgs R1 meaning
· option word (long option),
· character (short option),
· &23 '#' (number),
· &123 (negated number),
· &3F '?' on error (&3A ':' if the short opts string specifies)
· -1 (no more options)
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