Python comes in two flavors. In one, sys.maxunicode is 65535 and Py_UNICODE is a 16-bit type, and in the other, sys.maxunicode is 1114111 and Py_UNICODE is a 32-bit type. This is selected at compile time, and RedHat has chosen in some versions to compile for sys.maxunicode == 1114111.
By using the Py_UNICODE typedef, you generally don't have to worry about this
distinction. Here is some code that works on RedHat 9's Python 2.2
(sys.maxunicode == 1114111) and a manually built Python 2.3 (sys.maxunicode ==
65535).
#include <Python.h>
PyObject *f(PyObject *self, PyObject *o) {
if(PyString_Check(o)) {
char *c = PyString_AS_STRING(o);
int sz = PyString_GET_SIZE(o);
int i;
printf(" Byte string: ");
for(i=0; i<sz; i++) { printf("%4x ", c[i]); }
printf("\n");
} else if (PyUnicode_Check(o)) {
Py_UNICODE *c = PyUnicode_AS_UNICODE(o);
int sz = PyUnicode_GET_SIZE(o);
int i;
printf("Unicode string: ");
for(i=0; i<sz; i++) { printf("%4x ", c[i]); }
printf("\n");
}
Py_INCREF(Py_None);
return Py_None;
}
PyMethodDef d[] = {
{ "f", (PyCFunction)f, METH_O, "Print out the values in a string from C" },
{ NULL, NULL, 0, NULL }
};
void initunidemo(void) {
Py_InitModule("unidemo", d);
}
$ # build unidemo for python2.2
$ python2.2 -c 'import unidemo, sys; print sys.maxunicode;
unidemo.f(u"\N{copyright sign}\N{greek capital letter sigma}")'
1114111
Unicode string: a9 3a3
$ # rebuild unidemo for python2.3
$ python2.3 -c 'import unidemo, sys; print sys.maxunicode;
unidemo.f(u"\N{copyright sign}\N{greek capital letter sigma}")'
65535
Unicode string: a9 3a3
Jeff
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