From 13238c06a2e3ea8feac96d02690a856b7a2a1d37 Mon Sep 17 00:00:00 2001
From: reinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f>
Date: Wed, 4 May 2005 05:22:12 +0000
Subject: [lcd4linux @ 2005-05-04 05:22:12 by reinelt] * replaced
 fprintf(stderr,...  with error() * corrected a "dangling reference" memory
 problem * removed some PyErr_Print() spam * fixed a segmentation fault that
 occured when python module was not found * improved error messages

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@538 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
---
 plugin_python.c | 59 ++++++++++++++++++++++++++++++---------------------------
 1 file changed, 31 insertions(+), 28 deletions(-)

diff --git a/plugin_python.c b/plugin_python.c
index 7b61096..d832808 100644
--- a/plugin_python.c
+++ b/plugin_python.c
@@ -1,4 +1,4 @@
-/* $Id: plugin_python.c,v 1.2 2005/05/03 11:13:24 reinelt Exp $
+/* $Id: plugin_python.c,v 1.3 2005/05/04 05:22:12 reinelt Exp $
  *
  * Python plugin
  *
@@ -23,6 +23,14 @@
  *
  *
  * $Log: plugin_python.c,v $
+ * Revision 1.3  2005/05/04 05:22:12  reinelt
+ * * replaced fprintf(stderr,...  with error()
+ * * corrected a "dangling reference" memory problem
+ * * removed some PyErr_Print() spam
+ * * fixed a segmentation fault that occured when python module was not
+ * found
+ * * improved error messages
+ *
  * Revision 1.2  2005/05/03 11:13:24  reinelt
  * rearranged autoconf a bit,
  * libX11 will be linked only if really needed (i.e. when the X11 driver has been selected)
@@ -38,19 +46,12 @@
  *
  * int plugin_init_python (void)
  *  adds a python interpreter
- *
+ * 
  */
 
 #include <Python.h>
-
-#include "config.h"
-
-#include <stdlib.h>
-#include <stdio.h>
-
 #include "debug.h"
 #include "plugin.h"
-#include "hash.h"
 
 /* 
  * Executes a python function specified by function name and module.
@@ -58,10 +59,12 @@
  * This method is more or less a copy of an example found in the python 
  * documentation. Kudos goes to Guido van Rossum and Fred L. Drake.
  * 
- * Returns a char* directly from PyString_AsString() !!! DO NOT DEALLOCATE !!!
+ * Fixme: this function should be able to accept and receive any types 
+ * of arguments supported by the evaluator. Right now only strings are accepted.
  */
-static const char* 
-pyt_exec_str(const char* module, const char* function, int argc, const char* argv[]) {
+ 
+static void 
+pyt_exec_str(RESULT *result, const char* module, const char* function, int argc, const char* argv[]) {
 
   PyObject *pName, *pModule, *pDict, *pFunc;
   PyObject *pArgs, *pValue;
@@ -88,8 +91,9 @@ pyt_exec_str(const char* module, const char* function, int argc, const char* arg
         if (!pValue) {
           Py_DECREF(pArgs);
           Py_DECREF(pModule);
-          fprintf(stderr, "Cannot convert argument %s\n", argv[i]);
-          return NULL;
+          error("Cannot convert argument \"%s\" to python format", argv[i]);
+          SetResult(&result, R_STRING, "");
+          return;
         }
         /* pValue reference stolen here: */
         PyTuple_SetItem(pArgs, i, pValue);
@@ -98,40 +102,39 @@ pyt_exec_str(const char* module, const char* function, int argc, const char* arg
       Py_DECREF(pArgs);
       if (pValue != NULL) {
         rv = PyString_AsString(pValue);
-        //printf("Result of call: %s\n", rv);
+        SetResult(&result, R_STRING, rv);
         Py_DECREF(pValue);
-        return rv;
+        /* rv is now a 'dangling reference' */
+        return;
       }
       else {
         Py_DECREF(pModule);
-        PyErr_Print();
-        fprintf(stderr,"Call failed\n");
-        return NULL;
+        error("Python call failed (\"%s.%s\")", module, function); 
+        SetResult(&result, R_STRING, "");
+        return;
       }
       /* pDict and pFunc are borrowed and must not be Py_DECREF-ed */
     }
     else {
-      if (PyErr_Occurred())
-        PyErr_Print();
-      fprintf(stderr, "Cannot find function \"%s\"\n", argv[2]);
+      error("Can not find python function \"%s.%s\"", module, function);
     }
     Py_DECREF(pModule);
   }
   else {
-    PyErr_Print();
-    fprintf(stderr, "Failed to load \"%s\"\n", argv[1]);
-    return NULL;
+    error("Failed to load python module \"%s\"", module);
   }
-  return NULL;
+  SetResult(&result, R_STRING, "");
+  return;
 }
 
 static int python_cleanup_responsibility = 0;
     
 static void my_exec (RESULT *result, RESULT *module, RESULT *function, RESULT *arg )
 { 
+  /* Fixme: a plugin should be able to accept any number of arguments, don't know how
+     to code that (yet) */
   const char* args[] = {R2S(arg)};
-  const char* value = pyt_exec_str(R2S(module),R2S(function),1,args);
-  SetResult(&result, R_STRING, value); 
+  pyt_exec_str(result, R2S(module), R2S(function), 1, args);
 }
 
 int plugin_init_python (void)
-- 
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