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Get Command Line Parameters, a command line parser that extracts the command line parameters written in pure assembler.

akyprian
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Joined: 12-May 04


This is a command line parser that extracts the command line parameters. It is written in pure assembler.

CODE
ParseCommandLine Proc Uses EDI ESI lpCommandLine:LPSTR


MOV ESI,lpCommandLine

CMP BYTE PTR [ESI],'"'
JNE @F
;****************************************************
InQuotes:
ADD ESI,1
CMP BYTE PTR [ESI],'"'
JNE InQuotes
JMP Strip
;****************************************************
@@:
ADD ESI,1
CMP BYTE PTR [ESI],0
JE Ex
CMP BYTE PTR [ESI]," "
JNE @B
;Ok, the exe name is behind us
;****************************************************
;Let us strip spaces
Strip:
ADD ESI,1
MOV AL,BYTE PTR [ESI]
CMP AL,0
JE Ex;No arguments follow
CMP AL," "
JE Strip
;****************************************************
;Let's see if the following
;argument starts with quotes
XOR ECX,ECX
CMP BYTE PTR [ESI],'"'
JNE @F  ;NO
ADD ESI,1
MOV ECX,TRUE;YES
;****************************************************
;Let's find the end of this argument

@@:
;Store the start of this argument in EDI
MOV EDI,ESI

SUB ESI,1

Arg:
ADD ESI,1
MOV AL,BYTE PTR [ESI]

CMP AL,0
JE ArgFound

CMP ECX,0;Are we looking for a matching quote?
JE @F;No
CMP AL,'"';Yes
JNE Arg;Matching quote NOT found, try next byte
JMP ArgFound


@@:
CMP AL," "
JNE Arg

;ESI points to the end of this argument

;****************************************************

ArgFound:
PUSH EAX;Let's store BYTE PTR [ESI]

MOV BYTE PTR [ESI],0
;*************************************
;OK we have the argument from EDI to ESI
;Do what ever you want to the argument
;*************************************



IsLast:
POP EAX;Lets remind ourselves of BYTE PTR [ESI]
CMP AL,0;Was it a 0 ?
JNE Strip;No, so command line end not reached, continue parsing
;****************************************************

Ex:

RET

ParseCommandLine EndP

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