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/*
* Compile command :
* gcc -o interpreter -W -Wall -g --std=c99 -I/usr/include/python3.1/ -lpython3.1 interpreter.c
*/
#include <Python.h>
#include <stdio.h>
#include <string.h>
/*
* PyObjectList
*/
typedef struct PyObjectListElem
{
PyObject *object;
struct PyObjectListElem *next;
} PyObjectListElem;
typedef struct PyObjectList
{
PyObjectListElem *root;
int count;
} PyObjectList;
PyObjectList *createObjectList()
{
PyObjectList *ret = malloc(sizeof(PyObjectList));
ret->count = 0;
ret->root = 0;
return ret;
}
void insert(PyObjectList* list, PyObject *object)
{
if (!list || !object)
return;
PyObjectListElem *node = malloc(sizeof(PyObjectListElem));
node->object = object;
node->next = list->root;
list->root = node;
list->count++;
}
PyObject *moduleNamed(const char *name, PyObjectList *list)
{
PyObjectListElem *node = list->root;
while (node)
{
if (strcmp(PyModule_GetName(node->object), name) == 0)
return node->object;
node = node->next;
}
return NULL;
}
int listCount(PyObjectList *list)
{
return (list ? list->count : 0);
}
void freeList(PyObjectList *list, int deref)
{
if (!list)
return;
PyObjectListElem *node = list->root;
while (node)
{
PyObjectListElem *tmp = node;
node = node->next;
if (deref)
Py_DECREF(tmp->object);
free(tmp);
}
free(list);
}
/*
* Interpreter
*
* A Python interpreter object keeps the context like the loaded modules.
*/
typedef struct Interpreter
{
PyObjectList *modules;
} Interpreter;
Interpreter *createInterpreter()
{
Interpreter *ret = malloc(sizeof(Interpreter));
ret->modules = createObjectList();
return ret;
}
void freeInterpreter(Interpreter *inter)
{
if (!inter)
return;
freeList(inter->modules, 1);
free(inter);
Py_Finalize();
}
/*
* printf() like function that executes a python function
* @param interpreter Python interpreter object on which the function should be ran
* @param module name of the python module in which the function is
* @param funcName the function name to call
* @param arg_types printf() like list of arguments. See Python documentation
* @param ... arguments for the function
* FIXME:why are default arguments necessary ?
*/
PyObject *executeFunction(Interpreter *interpreter, const char *module, const char *funcName, const char* format, ...)
{
if (!Py_IsInitialized())
Py_Initialize();
// Make argument list
PyObject *args;
if (format == NULL)
args = Py_None;
else
{
va_list listArgs;
va_start(listArgs, format);
args = Py_VaBuildValue(format, listArgs);
}
// Look for the module.
PyObject *mod = 0;
if (interpreter->modules)
{
mod = moduleNamed(module, interpreter->modules);
}
if (!mod)
{
mod = PyImport_ImportModule(module);
if (!mod)
return NULL;
insert(interpreter->modules, mod);
}
/*printf("mod: %p ", mod);
PyObject_Print(mod, stdout, 0);
printf("\n");*/
// Look for the function
PyObject *func = PyObject_GetAttrString(mod, funcName);
if (!PyCallable_Check(func))
return NULL;
// Call the function
/*printf("func: %p\n", func);
PyObject_Print(func, stdout, 0);
printf("\n");*/
PyObject *val = PyObject_Call(func, args, NULL);
// Add return value object in a local list so it can be DECREF'ed when the interpreter is deleted.
// TODO
Py_DECREF(args);
return val;
}
/*
PyObject *executeMethod(PyObject *object, const char *methName, const char* format, ...)
{
if (!Py_IsInitialized())
Py_Initialize();
// Make argument list
PyObject *args;
if (format == NULL)
args = Py_None;
else
{
va_list listArgs;
va_start(listArgs, format);
args = Py_VaBuildValue(format, listArgs);
}
PyObject *ret = PyObject_CallMethod(object, methName, )
}*/
int main(int argc, char *argv[])
{
Interpreter *in = createInterpreter();
executeFunction(in, "portage.data", "portage_group_warning", NULL);
PyObject *arg1 = executeFunction(in, "portage", "pkgsplit", "sI", "app-portage/kuroo4-4.2", 1);
PyObject *arg2 = executeFunction(in, "portage", "pkgsplit", "sI", "app-portage/kuroo4-4.1", 1);
PyObject *ret = executeFunction(in, "portage", "pkgcmp", "OO", arg1, arg2);
if (!ret)
printf("failed :-( \n");
else
printf("Return %ld\n", PyLong_AsLong(ret));
Py_DECREF(ret);
Py_DECREF(arg1);
Py_DECREF(arg2);
PyObject *tbz = executeFunction(in, "portage.output", "ProgressBar", "sIs", "titre", 100, "status");
ret = PyObject_CallMethod(tbz, "inc", "I", 25);
Py_DECREF(tbz);
Py_DECREF(ret);
freeInterpreter(in);
return 0;
}
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