Learn the movsb (mov string) instruction to do a memory-to-memory copy and implement the strcpy function.
source code:
https://github.com/vishmohan/inline_assembly_examples/blob/master/strcpy/strcpy.cpp
Here is the pseudo code snippet from the Intel manual - When DF = 0 the operation moves forward (so the program uses CLD instruction to clear DF before executing movsb).
IF (Byte move)
THEN IF DF = 0
THEN
(E)SI ← (E)SI + 1;
(E)DI ← (E)DI + 1;
ELSE
(E)SI ← (E)SI – 1;
(E)DI ← (E)DI – 1;
FI
