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#include <Python.h>
#include "stations-code.h"
static struct {
char *callsign;
char *locator;
} station_list[] = {
#include "stations.dat.h"
};
static int hash_f (const char *s, const int *T)
{
register int i, sum = 0;
for (i = 0; s[i] != '\0'; i++) {
sum += T[i] * s[i];
sum %= NG;
}
return sum;
}
static int perf_hash (const char *k)
{
if (strlen (k) > NS)
return 0;
return (G[ hash_f(k, T1) ] + G[ hash_f(k, T2)] ) % NG;
}
static int getlocator (char *locator, const char *callsign)
{
int hashval = perf_hash (callsign);
if (hashval < NK && strcmp(callsign, station_list[hashval].callsign) == 0) {
strcpy (locator, station_list[hashval].locator);
return 1;
}
return 0;
}
static PyObject *
stations_locator(PyObject *self, PyObject *args)
{
const char *callsign;
char locator[6];
if (!PyArg_ParseTuple(args, "s", &callsign))
return NULL;
return Py_BuildValue("s", (getlocator (locator, callsign) == 1) ?
locator : NULL);
}
static PyMethodDef StationsMethods[] = {
{"locator", stations_locator, METH_VARARGS,
"Get locator from callsign."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
PyMODINIT_FUNC
initstations(void)
{
(void) Py_InitModule("stations", StationsMethods);
}
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