ryg's version: byte count == 22

gistfile1.txt

# ryg's version
# getchar:
        31 C0                   # xor eax, eax
        50                      # push eax
        89 E1                   # mov ecx, esp
        50                      # push eax
        51                      # push ecx
        50                      # push eax
        50                      # push eax
        B0 03                   # mov al, 3
        CD 80                   # int 80h
        85 C0                   # test eax, eax
        74 05                   # je exit
        83 C4 10                # add esp, 16
        58                      # pop eax
        C3                      # ret