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A string, both in Common-Lisp and in ECL is nothing but a vector of
characters. Therefore, almost everything mentioned in the section of arrays
remains valid here. The only important difference is that ECL stores
strings as a lisp object with a pointer to a zero terminated C string. Thus, if
a string has n characters, ECL will reserve n+1 bytes for the
string. This allows us to pass the string self
pointer to any C
routine.
If x is a lisp object of type string, we can access the following fields:
x->string.dim
x->string.fillp
x->string.self
x->string.hasfillp
x->string.fillp
can be smaller than x->string.dim
.
Both routines build a lisp string from a C string.
make_string_copy
allocates new space and copies the content of the string to it.make_simple_string
simply uses the memory pointed by s, which should not be deallocated. Both routines usestrlen
to calculate the length of the string.