Memory blocks often represent character strings; For ways of storing character strings in memory see String representations. For other string-processing words see Displaying characters and strings.
In case you want to write a program that is portable to systems with
1 chars>1 (not recommended), you have to note the difference
between words that take a number of aus (e.g., erase) and words
that take a number of chars (e.g., blank), and insert
chars as appropriate.
When copying characters between overlapping memory regions, use
move. Cmove and cmove> tend to be slower than a
well-implemented move.
move ( c-from c-to ucount – ) core “move”
Copy the contents of ucount aus at c-from to
c-to. move works correctly even if the two areas overlap.
cmove ( c-from c-to u – ) string “c-move”
Copy the contents of ucount characters from data space at
c-from to c-to. The copy proceeds char-by-char
from low address to high address; i.e., for overlapping areas it is
safe if c-to<=c-from.
cmove> ( c-from c-to u – ) string “c-move-up”
Copy the contents of ucount characters from data space at
c-from to c-to. The copy proceeds char-by-char
from high address to low address; i.e., for overlapping areas it is
safe if c-to>=c-from.
fill ( c-addr u c – ) core “fill”
Store c in u chars starting at c-addr.
erase ( addr u – ) core-ext “erase”
Clear all bits in u aus starting at addr.
blank ( c-addr u – ) string “blank”
Store the space character into u chars starting at c-addr.
pad ( – c-addr ) core-ext “pad”
c-addr is the address of a transient region that can be used as temporary data storage. At least 84 characters of space is available.