python: Add new helper functions for python to C integral conversion

https://bugzilla.redhat.com/show_bug.cgi?id=807751

    int libvirt_intUnwrap(PyObject *obj, int *val);
    int libvirt_uintUnwrap(PyObject *obj, unsigned int *val);
    int libvirt_longUnwrap(PyObject *obj, long *val);
    int libvirt_ulongUnwrap(PyObject *obj, unsigned long *val);
    int libvirt_longlongUnwrap(PyObject *obj, long long *val);
    int libvirt_ulonglongUnwrap(PyObject *obj, unsigned long long *val);
    int libvirt_doubleUnwrap(PyObject *obj, double *val);
    int libvirt_boolUnwrap(PyObject *obj, bool *val);
(cherry picked from commit 384ebd3fc5deec035d6894352a25fd2b7f637cf0)

2 files changed, 141 insertions, 0 deletions

diff --git a/typewrappers.c b/typewrappers.c
index 3f200b3..8b9df75 100644
--- a/typewrappers.c
+++ b/typewrappers.c
@@ -119,6 +119,138 @@ libvirt_constcharPtrWrap(const char *str)
     return (ret);
 }
 
+int
+libvirt_intUnwrap(PyObject *obj, int *val)
+{
+    long long_val;
+
+    /* If obj is type of PyInt_Type, PyInt_AsLong converts it
+     * to C long type directly. If it is of PyLong_Type, PyInt_AsLong
+     * will call PyLong_AsLong() to deal with it automatically.
+     */
+    long_val = PyInt_AsLong(obj);
+    if ((long_val == -1) && PyErr_Occurred())
+        return -1;
+
+    if ((int)long_val == long_val) {
+        *val = long_val;
+    } else {
+        PyErr_SetString(PyExc_OverflowError,
+                        "Python int too large to convert to C int");
+        return -1;
+    }
+    return 0;
+}
+
+int
+libvirt_uintUnwrap(PyObject *obj, unsigned int *val)
+{
+    long long_val;
+
+    long_val = PyInt_AsLong(obj);
+    if ((long_val == -1) && PyErr_Occurred())
+        return -1;
+
+    if ((unsigned int)long_val == long_val) {
+        *val = long_val;
+    } else {
+        PyErr_SetString(PyExc_OverflowError,
+                        "Python int too large to convert to C unsigned int");
+        return -1;
+    }
+    return 0;
+}
+
+int
+libvirt_longUnwrap(PyObject *obj, long *val)
+{
+    long long_val;
+
+    long_val = PyInt_AsLong(obj);
+    if ((long_val == -1) && PyErr_Occurred())
+        return -1;
+
+    *val = long_val;
+    return 0;
+}
+
+int
+libvirt_ulongUnwrap(PyObject *obj, unsigned long *val)
+{
+    long long_val;
+
+    long_val = PyInt_AsLong(obj);
+    if ((long_val == -1) && PyErr_Occurred())
+        return -1;
+
+    *val = long_val;
+    return 0;
+}
+
+int
+libvirt_longlongUnwrap(PyObject *obj, long long *val)
+{
+    long long llong_val;
+
+    /* If obj is of PyInt_Type, PyLong_AsLongLong
+     * will call PyInt_AsLong() to handle it automatically.
+     */
+    llong_val = PyLong_AsLongLong(obj);
+    if ((llong_val == -1) && PyErr_Occurred())
+        return -1;
+
+    *val = llong_val;
+    return 0;
+}
+
+int
+libvirt_ulonglongUnwrap(PyObject *obj, unsigned long long *val)
+{
+    unsigned long long ullong_val = -1;
+
+    /* The PyLong_AsUnsignedLongLong doesn't check the type of
+     * obj, only accept argument of PyLong_Type, so we check it instead.
+     */
+    if (PyInt_Check(obj))
+        ullong_val = PyInt_AsLong(obj);
+    else if (PyLong_Check(obj))
+        ullong_val = PyLong_AsUnsignedLongLong(obj);
+    else
+        PyErr_SetString(PyExc_TypeError, "an integer is required");
+
+    if ((ullong_val == -1) && PyErr_Occurred())
+        return -1;
+
+    *val = ullong_val;
+    return 0;
+}
+
+int
+libvirt_doubleUnwrap(PyObject *obj, double *val)
+{
+    double double_val;
+
+    double_val = PyFloat_AsDouble(obj);
+    if ((double_val == -1) && PyErr_Occurred())
+        return -1;
+
+    *val = double_val;
+    return 0;
+}
+
+int
+libvirt_boolUnwrap(PyObject *obj, bool *val)
+{
+    int ret;
+
+    ret = PyObject_IsTrue(obj);
+    if (ret < 0)
+        return ret;
+
+    *val = ret > 0;
+    return 0;
+}
+
 PyObject *
 libvirt_virDomainPtrWrap(virDomainPtr node)
 {
diff --git a/typewrappers.h b/typewrappers.h
index 1e34dfa..af68bce 100644
--- a/typewrappers.h
+++ b/typewrappers.h
@@ -7,6 +7,7 @@
  */
 
 #include <Python.h>
+#include <stdbool.h>
 #include "libvirt/libvirt.h"
 #include "libvirt/virterror.h"
 
@@ -163,6 +164,14 @@ PyObject * libvirt_ulonglongWrap(unsigned long long val);
 PyObject * libvirt_charPtrWrap(char *str);
 PyObject * libvirt_charPtrSizeWrap(char *str, Py_ssize_t size);
 PyObject * libvirt_constcharPtrWrap(const char *str);
+int libvirt_intUnwrap(PyObject *obj, int *val);
+int libvirt_uintUnwrap(PyObject *obj, unsigned int *val);
+int libvirt_longUnwrap(PyObject *obj, long *val);
+int libvirt_ulongUnwrap(PyObject *obj, unsigned long *val);
+int libvirt_longlongUnwrap(PyObject *obj, long long *val);
+int libvirt_ulonglongUnwrap(PyObject *obj, unsigned long long *val);
+int libvirt_doubleUnwrap(PyObject *obj, double *val);
+int libvirt_boolUnwrap(PyObject *obj, bool *val);
 PyObject * libvirt_virConnectPtrWrap(virConnectPtr node);
 PyObject * libvirt_virDomainPtrWrap(virDomainPtr node);
 PyObject * libvirt_virNetworkPtrWrap(virNetworkPtr node);