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/* File : example.i */
%module example
%include exception.i
%include typemaps.i
extern int gcd(int x, int y);
%typemap(in,fragment="t_output_helper") (int argc, char *argv[]) {
int i;
if (!PyList_Check($input)) {
SWIG_exception(SWIG_ValueError, "Expecting a list");
return NULL;
}
$1 = PyList_Size($input);
if ($1 == 0) {
SWIG_exception(SWIG_ValueError, "List must contain at least 1 element");
return NULL;
}
$2 = (char **) malloc(($1+1)*sizeof(char *));
for (i = 0; i < $1; i++) {
PyObject *s = PyList_GetItem($input,i);
if (!PyString_Check(s)) {
SWIG_exception(SWIG_ValueError, "List items must be strings");
free($2);
return NULL;
}
$2[i] = PyString_AsString(s);
}
$2[i] = 0;
}
extern int gcdmain(int argc, char *argv[]);
%typemap(python,in) (char *bytes, int len) {
if (!PyString_Check($input)) {
PyErr_SetString(PyExc_ValueError,"Expected a string");
return NULL;
}
$1 = PyString_AsString($input);
$2 = PyString_Size($input);
}
extern int count(char *bytes, int len, char c);
/* This example shows how to wrap a function that mutates a string */
/* Since str is modified, we make a copy of the Python object
so that we don't violate it's mutability */
%typemap(python,in) (char *str, int len) {
$2 = PyString_Size($input);
$1 = (char *) malloc($2+1);
memmove($1,PyString_AsString($input),$2);
}
/* Return the mutated string as a new object. The t_output_helper
function takes an object and appends it to the output object
to create a tuple */
%typemap(python,argout) (char *str, int len) {
PyObject *o;
o = PyString_FromStringAndSize($1,$2);
$result = t_output_helper($result,o);
free($1);
}
extern void capitalize(char *str, int len);
/* A multi-valued constraint. Force two arguments to lie
inside the unit circle */
%typemap(check) (double cx, double cy) {
double a = $1*$1 + $2*$2;
if (a > 1.0) {
SWIG_exception(SWIG_ValueError,"$1_name and $2_name must be in unit circle");
return NULL;
}
}
extern void circle(double cx, double cy);
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