#include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include <stdio.h>
#include <string.h>
+#include <dirent.h>
+#include <config.h>
+
+/* Re-define some string functions for Python >= 3.0. */
+#if PY_VERSION_HEX >= 0x03000000
+#define PyString_AsString PyBytes_AsString
+#define PyString_FromString PyBytes_FromString
+#define PyString_Check PyBytes_Check
+#endif
+
+/* The list of protocol decoders. */
+GSList *list_pds = NULL;
+
+/*
+ * Here's a quick overview of Python/C API reference counting.
+ *
+ * Check the Python/C API docs for what type of reference a function returns.
+ *
+ * - If it returns a "new reference", you're responsible to Py_DECREF() it.
+ *
+ * - If it returns a "borrowed reference", you MUST NOT Py_DECREF() it.
+ *
+ * - If a function "steals" a reference, you no longer are responsible for
+ * Py_DECREF()ing it (someone else will do it for you at some point).
+ */
/**
* Initialize libsigrokdecode.
*
- * @return 0 upon success, non-zero otherwise.
+ * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
*/
int sigrokdecode_init(void)
{
+ DIR *dir;
+ struct dirent *dp;
+ char *tmp;
+
/* Py_Initialize() returns void and usually cannot fail. */
Py_Initialize();
- /* Add some more search directories for convenience. */
+ /* Add search directory for the protocol decoders. */
/* FIXME: Check error code. */
- PyRun_SimpleString(
- "import sys;"
- "sys.path.append('libsigrokdecode/scripts');"
- "sys.path.append('../libsigrokdecode/scripts');"
- "sys.path.append('/usr/local/share/sigrok');"
- );
-
- return 0;
+ /* FIXME: What happens if this function is called multiple times? */
+ PyRun_SimpleString("import sys;"
+ "sys.path.append(r'" DECODERS_DIR "');");
+
+ if (!(dir = opendir(DECODERS_DIR)))
+ return SIGROKDECODE_ERR_DECODERS_DIR;
+
+ while ((dp = readdir(dir)) != NULL) {
+ if (!g_str_has_suffix(dp->d_name, ".py"))
+ continue;
+ /* For now use the filename (without .py) as decoder name. */
+ if ((tmp = g_strndup(dp->d_name, strlen(dp->d_name) - 3)))
+ list_pds = g_slist_append(list_pds, tmp);
+ }
+ closedir(dir);
+
+ return SIGROKDECODE_OK;
+}
+
+/**
+ * Returns the list of supported/loaded protocol decoders.
+ *
+ * This is a GSList containing the names of the decoders as strings.
+ *
+ * @return List of decoders, NULL if none are supported or loaded.
+ */
+GSList *sigrokdecode_list_decoders(void)
+{
+ return list_pds;
}
/**
*
* TODO: @param entries.
*
- * @return 0 upon success, non-zero otherwise. The 'outstr' argument will
- * point to a malloc()ed string upon success.
+ * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
+ * The 'outstr' argument points to a malloc()ed string upon success.
*/
static int h_str(PyObject *py_res, PyObject *py_func, PyObject *py_mod,
const char *key, char **outstr)
py_str = PyMapping_GetItemString(py_res, (char *)key);
if (!py_str || !PyString_Check(py_str)) {
if (PyErr_Occurred())
- PyErr_Print();
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_func);
Py_DECREF(py_mod);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
}
+ /*
+ * PyString_AsString()'s returned string refers to an internal buffer
+ * (not a copy), i.e. the data must not be modified, and the memory
+ * must not be free()'d.
+ */
if (!(str = PyString_AsString(py_str))) {
if (PyErr_Occurred())
- PyErr_Print();
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_str);
Py_DECREF(py_func);
Py_DECREF(py_mod);
if (!(*outstr = strdup(str))) {
if (PyErr_Occurred())
- PyErr_Print();
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_str);
Py_DECREF(py_func);
Py_DECREF(py_mod);
Py_DECREF(py_str);
- return 0;
+ return SIGROKDECODE_OK;
}
/**
* TODO
*
* @param name TODO
- * @return 0 upon success, non-zero otherwise.
+ *
+ * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
*/
int sigrokdecode_load_decoder(const char *name,
struct sigrokdecode_decoder **dec)
int r;
/* Get the name of the decoder module as Python string. */
- if (!(py_name = PyString_FromString(name))) {
- PyErr_Print();
+ if (!(py_name = PyString_FromString(name))) { /* NEWREF */
+ PyErr_Print(); /* Returns void. */
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
}
/* "Import" the Python module. */
- if (!(py_mod = PyImport_Import(py_name))) {
- PyErr_Print();
+ if (!(py_mod = PyImport_Import(py_name))) { /* NEWREF */
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_name);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
}
Py_DECREF(py_name);
/* Get the 'register' function name as Python callable object. */
- py_func = PyObject_GetAttrString(py_mod, "register");
+ py_func = PyObject_GetAttrString(py_mod, "register"); /* NEWREF */
if (!py_func || !PyCallable_Check(py_func)) {
if (PyErr_Occurred())
- PyErr_Print();
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_mod);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
}
/* Call the 'register' function without arguments, get the result. */
- if (!(py_res = PyObject_CallFunction(py_func, NULL))) {
- PyErr_Print();
+ if (!(py_res = PyObject_CallFunction(py_func, NULL))) { /* NEWREF */
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_func);
Py_DECREF(py_mod);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
Py_DECREF(py_func);
/* Get the 'decode' function name as Python callable object. */
- py_func = PyObject_GetAttrString(py_mod, "decode");
+ py_func = PyObject_GetAttrString(py_mod, "decode"); /* NEWREF */
if (!py_func || !PyCallable_Check(py_func)) {
if (PyErr_Occurred())
- PyErr_Print();
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_mod);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
}
*dec = d;
- return 0;
+ return SIGROKDECODE_OK;
}
/**
* @param inbuflen TODO
* @param outbuf TODO
* @param outbuflen TODO
- * @return 0 upon success, non-zero otherwise.
+ *
+ * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
*/
int sigrokdecode_run_decoder(struct sigrokdecode_decoder *dec,
uint8_t *inbuf, uint64_t inbuflen,
/* TODO: Error handling. */
py_mod = dec->py_mod;
+ Py_INCREF(py_mod);
py_func = dec->py_func;
-
- /* TODO: Really run Py_DECREF on py_mod/py_func? */
+ Py_INCREF(py_func);
/* Create a Python tuple of size 1. */
- if (!(py_args = PyTuple_New(1))) {
- PyErr_Print();
+ if (!(py_args = PyTuple_New(1))) { /* NEWREF */
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_func);
Py_DECREF(py_mod);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
/* Get the input buffer as Python "string" (byte array). */
/* TODO: int vs. uint64_t for 'inbuflen'? */
- if (!(py_value = Py_BuildValue("s#", inbuf, inbuflen))) {
- PyErr_Print();
+ if (!(py_value = Py_BuildValue("s#", inbuf, inbuflen))) { /* NEWREF */
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_args);
Py_DECREF(py_func);
Py_DECREF(py_mod);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
}
- if (PyTuple_SetItem(py_args, 0, py_value) != 0) {
- PyErr_Print();
- Py_DECREF(py_value);
+ /*
+ * IMPORTANT: PyTuple_SetItem() "steals" a reference to py_value!
+ * That means we are no longer responsible for Py_DECREF()'ing it.
+ * It will automatically be free'd when the 'py_args' tuple is free'd.
+ */
+ if (PyTuple_SetItem(py_args, 0, py_value) != 0) { /* STEAL */
+ PyErr_Print(); /* Returns void. */
+ Py_DECREF(py_value); /* TODO: Ref. stolen upon error? */
Py_DECREF(py_args);
Py_DECREF(py_func);
Py_DECREF(py_mod);
return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
}
- if (!(py_res = PyObject_CallObject(py_func, py_args))) {
- PyErr_Print();
- Py_DECREF(py_value);
+ if (!(py_res = PyObject_CallObject(py_func, py_args))) { /* NEWREF */
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_args);
Py_DECREF(py_func);
Py_DECREF(py_mod);
if ((ret = PyObject_AsCharBuffer(py_res, (const char **)outbuf,
(Py_ssize_t *)outbuflen))) {
- PyErr_Print();
+ PyErr_Print(); /* Returns void. */
Py_DECREF(py_res);
- Py_DECREF(py_value);
Py_DECREF(py_args);
Py_DECREF(py_func);
Py_DECREF(py_mod);
}
Py_DECREF(py_res);
- // Py_DECREF(py_value);
Py_DECREF(py_args);
Py_DECREF(py_func);
Py_DECREF(py_mod);
- return 0;
+ return SIGROKDECODE_OK;
}
/**
* Shutdown libsigrokdecode.
*
- * @return 0 upon success, non-zero otherwise.
+ * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
*/
int sigrokdecode_shutdown(void)
{
/* Py_Finalize() returns void, any finalization errors are ignored. */
Py_Finalize();
- return 0;
+ return SIGROKDECODE_OK;
}
projects / libsigrokdecode.git / blobdiff