Method: FFI::AbstractMemory#get_array_of_string

Defined in:
ext/ffi_c/AbstractMemory.c

#get_array_of_string(offset, count = nil) ⇒ Array<String>

Return an array of strings contained in memory.

Parameters:

  • offset (Integer) —

    point in memory to start from

  • count (Integer) —

    number of strings to get. If nil, return all strings

Returns:

  • (Array<String>)

Raises:

  • (IndexError) —

    if offset is too great

  • (NullPointerError) —

    if memory not initialized



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# File 'ext/ffi_c/AbstractMemory.c', line 444

static VALUE
memory_get_array_of_string(int argc, VALUE* argv, VALUE self)
{
    VALUE offset = Qnil, countnum = Qnil, retVal = Qnil;
    AbstractMemory* ptr;
    long off;
    int count;

    rb_scan_args(argc, argv, "11", &offset, &countnum);
    off = NUM2LONG(offset);
    count = (countnum == Qnil ? 0 : NUM2INT(countnum));
    retVal = rb_ary_new2(count);

    TypedData_Get_Struct(self, AbstractMemory, &rbffi_abstract_memory_data_type, ptr);
    checkRead(ptr);

    if (countnum != Qnil) {
        int i;

        checkBounds(ptr, off, count * sizeof (char*));

        for (i = 0; i < count; ++i) {
            const char* strptr = *((const char**) (ptr->address + off) + i);
            rb_ary_push(retVal, (strptr == NULL ? Qnil : rb_str_new2(strptr)));
        }

    } else {
        checkBounds(ptr, off, sizeof (char*));
        for ( ; off < ptr->size - (long) sizeof (void *); off += (long) sizeof (void *)) {
            const char* strptr = *(const char**) (ptr->address + off);
            if (strptr == NULL) {
                break;
            }
            rb_ary_push(retVal, rb_str_new2(strptr));
        }
    }

    return retVal;
}