python/modules.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <Python.h>
  21 #include "py3compat.h"
  22 #include "includes.h"
  23 #include "python/modules.h"
  24 #include "dynconfig/dynconfig.h"
  25
  26 static bool PySys_PathPrepend(PyObject *list, const char *path)
  27 {
  28         bool ok;
  29         PyObject *py_path = PyUnicode_FromString(path);
  30         if (py_path == NULL) {
  31                 return false;
  32         }
  33         ok = PyList_Insert(list, 0, py_path) == 0;
  34         Py_XDECREF(py_path);
  35         return ok;
  36 }
  37
  38 bool py_update_path(void)
  39 {
  40         PyObject *mod_sys = NULL;
  41         PyObject *py_path = NULL;
  42
  43         mod_sys = PyImport_ImportModule("sys");
  44         if (mod_sys == NULL) {
  45                 return false;
  46         }
  47
  48         py_path = PyObject_GetAttrString(mod_sys, "path");
  49         if (py_path == NULL) {
  50                 goto error;
  51         }
  52
  53         if (!PyList_Check(py_path)) {
  54                 goto error;
  55         }
  56
  57         if (!PySys_PathPrepend(py_path, dyn_PYTHONDIR)) {
  58                 goto error;
  59         }
  60
  61         if (strcmp(dyn_PYTHONARCHDIR, dyn_PYTHONDIR) != 0) {
  62                 if (!PySys_PathPrepend(py_path, dyn_PYTHONARCHDIR)) {
  63                         goto error;
  64                 }
  65         }
  66         Py_XDECREF(py_path);
  67         Py_XDECREF(mod_sys);
  68         return true;
  69 error:
  70         Py_XDECREF(py_path);
  71         Py_XDECREF(mod_sys);
  72         return false;
  73 }
  74
  75 char **PyList_AsStringList(TALLOC_CTX *mem_ctx, PyObject *list,
  76                            const char *paramname)
  77 {
  78         char **ret;
  79         Py_ssize_t i;
  80         if (!PyList_Check(list)) {
  81                 PyErr_Format(PyExc_TypeError, "%s is not a list", paramname);
  82                 return NULL;
  83         }
  84         ret = talloc_array(NULL, char *, PyList_Size(list)+1);
  85         if (ret == NULL) {
  86                 PyErr_NoMemory();
  87                 return NULL;
  88         }
  89
  90         for (i = 0; i < PyList_Size(list); i++) {
  91                 const char *value;
  92                 Py_ssize_t size;
  93                 PyObject *item = PyList_GetItem(list, i);
  94                 if (!PyUnicode_Check(item)) {
  95                         PyErr_Format(PyExc_TypeError, "%s should be strings", paramname);
  96                         talloc_free(ret);
  97                         return NULL;
  98                 }
  99                 value = PyUnicode_AsUTF8AndSize(item, &size);
 100                 if (value == NULL) {
 101                         talloc_free(ret);
 102                         return NULL;
 103                 }
 104                 ret[i] = talloc_strndup(ret, value, size);
 105                 if (ret[i] == NULL) {
 106                         PyErr_NoMemory();
 107                         talloc_free(ret);
 108                         return NULL;
 109                 }
 110         }
 111         ret[i] = NULL;
 112         return ret;
 113 }
 114