LinuxQuestions.org - Motorola 68000 assembly text strings

I am writing an assembly program for the Motorola 68000, and I am having trouble doing dynamic strings. I want to be able to append information to a string, and then print it out.

EDIT: Made some progress. I can dynamically generate a string, but to append to that string is a problem. I am having trouble using the kludgey pointer system here in Assembler. I cannot seem to use pointers to the actual buffer....

Code:

goodbuffer  MACRO

            LEA    bufferptr,A1    ; Load pointer to string buffer

            LEA    \1,A2          ; Load the string starting address

            LEA    \2,A3          ; Load the string ending address

for_loop\@  CMPA    A2,A3          ; Check loop counters

            BEQ    loop_end\@      ; Check for ending loop

            MOVE.B  (A2),(A1)+      ; Move a character of string in A2 into the buffer

            ADDA    #1,A2          ; Increment the loop counter by 1

            BRA    for_loop\@      ; Loop again

loop_end\@

            LEA    bufferptr,A1    ; Reload original pointing address of bufferptr

            ADDA    A3,A1          ; Add ending string address to  bufferptr address

            MOVE.L A1,bufferptr    ; Store the new address into bufferptr

            ENDM

Here is an example in C++ of what to do in Assembly:

string str = "";
// doing stuff....
str += "ADDI.W ";
// more stuff....
str += " D2,D4";
cout << str << endl;
[/code]

Edit: Solved, though not efficiently.