I have dabbled with this one for a while but wanted to avoid a tangled mess of allocations and de-allocations but have come up with a design that combined both library modules and a macro pair to keep it simple and tidy to use without it being a nightmare to clean up.
It is a space delimited parser that can handle single arguments or multiple arguments enclosed in double quotes so that you can pass long files names with spaces to a application that requires this type of support. This is the batch file used with this test piece, it is enclosed in the zip file below.
@echo off
p6 one two three four five six seven eight
p6 "one" two "three 333" four "five 555" six "seven 777" eight
p6 one "two 222" three "four 444" five "six 666" seven "eight 888"
pause
Because of its design it should not be vulnerable to exploits that pass a command line via CreateProcess() that is far larger than the normal 260 character limit for non UNICODE paths and about the only limitation that I can find is the app that uses this code cannot have a file name that has spaces in it.
The short name is due to how I developed the idea. I started at p1 and and got the version I wanted at p6. It can also be done using 2 library modules but the macro system is simpler to use. This is the test code for the technique.
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entry_point proc
USING r12,r13
LOCAL parr :QWORD
LOCAL acnt :QWORD
SaveRegs
; --------------------------------------------
; get command line pointer array and arg count
; --------------------------------------------
CmdBegin parr,acnt ; start here
; -----------------------------------
; loop through command tail arguments
; -----------------------------------
mov r12, parr ; load array pointer into r12
mov r13, acnt ; load argument count into r13
lpst:
conout QWORD PTR [r12],lf ; QWORD PTR for array member
add r12, 8 ; add 8 to get next array member
sub r13, 1 ; decrement the argument counter
jnz lpst ; loop back if not zero
conout "arg count = ",str$(acnt),lf,lf ; display arg count
; -----------------------------------
; ***********************************
; free cmd arg processing memory
; ***********************************
CmdEnd ; end here
RestoreRegs
.exit
entry_point endp
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