I recently started learning C since I want to be able to write Python
extension modules. In fact, there is no need for it, but I simply want
to try something new ...
I tried to implement the bubblesort algorithm in C and to use it in
python; bubblesort.c compiles fine, but whenever I want to import the
modul and call the function I get a segmentation fault. This is what the
code looks like:
static PyObject *py_bubblesort(PyObject *self, PyObject *args) {
PyObject *seq = NULL, *item, *newseq = NULL;
int seqlen, i;
if(!PyArg_ParseTuple(args, "O", &seq)) {
return NULL;
}
seq = PySequence_Fast(seq, "argument must be iterable");
if(!seq) {
return NULL;
}
seqlen = PySequence_Fast_GET_SIZE(seq);
int list[seqlen];
for (i = 0; i <= seqlen; i++) {
item = PySequence_Fast_GET_ITEM(seq, i);
list[i] = item;
}
bubblesort(list, seqlen);
newseq = PyList_New(seqlen);
if(!newseq) {
return NULL;
}
for(i = 0; i < seqlen; i++) {
PyList_SetItem(newseq, i, list[i]);
}
return newseq;
bubblesort(int list[], int seqlen) is doing the actual job and it is
working.
What did I do wrong? As I am quite new to C, I probably made many
mistakes, so please feel free to correct me.
Cheers,
Fabian
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