A Solution

Notes

• I will probably never find out how many lines of code the previous solution will generate.
  • The code should not be hard to generate,
  • But I also don't feel that we would gain anything from generating it.
• So I have a partial solution
  • Take a look at lib.cpp
  • This has a memory leak
  • I just call fdopen (see man fdopen)
  • Also, I ran up hard against the 16 byte stack alignment rule
    • So here is a solution

    • mov r12, rsp
      and rsp, -16
      call GetString
      mov rsp, r12 

• I moved on to build a GET_WORD function
  • I needed STRLEN and STRCPY
    • There are standard library implementations of these
    • But they are quite easy to write, so I wrote them.
    • Note that they are both leaf routines
    • I could, and probably should have written STRDUP, but I built that into GET_WORD
  • This reads in a maximum size word.
    • How could this be avoided? (yuck in assembly)
  • Everything should be fairly straight forward from here.
  • Gaze upon preList.asm.
• I abstracted these out into a library
  • And added any string functions I need (strcmp) to complete the list task.