[libsigrokdecode.git] / decode.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#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_XDECREF() it.
 *
 *  - If it returns a "borrowed reference", you MUST NOT Py_XDECREF() it.
 *
 *  - If a function "steals" a reference, you no longer are responsible for
 *    Py_XDECREF()ing it (someone else will do it for you at some point).
 */

/**
 * Initialize libsigrokdecode.
 *
 * @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 search directory for the protocol decoders. */
	/* FIXME: Check error code. */
	/* 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;
}

/**
 * Helper function to handle Python strings.
 *
 * TODO: @param entries.
 *
 * @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)
{
	PyObject *py_str;
	char *str;
	int ret;

	py_str = PyMapping_GetItemString(py_res, (char *)key);
	if (!py_str || !PyString_Check(py_str)) {
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_h_decref_func;
	}

	/*
	 * 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))) {
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_h_decref_str;
	}

	if (!(*outstr = strdup(str))) {
		ret = SIGROKDECODE_ERR_MALLOC;
		goto err_h_decref_str;
	}

	Py_XDECREF(py_str);

	return SIGROKDECODE_OK;

err_h_decref_str:
	Py_XDECREF(py_str);
err_h_decref_func:
	Py_XDECREF(py_func);
	Py_XDECREF(py_mod);

	if (PyErr_Occurred())
		PyErr_Print(); /* Returns void. */

	return ret;
}

/**
 * TODO
 *
 * @param name TODO
 *
 * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
 */
int sigrokdecode_load_decoder(const char *name,
			      struct sigrokdecode_decoder **dec)
{
	struct sigrokdecode_decoder *d;
	PyObject *py_mod, *py_func, *py_res /* , *py_tuple */;
	int r;

	/* "Import" the Python module. */
	if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */
		PyErr_Print(); /* Returns void. */
		return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	}

	/* Get the 'register' function name as Python callable object. */
	py_func = PyObject_GetAttrString(py_mod, "register"); /* NEWREF */
	if (!py_func || !PyCallable_Check(py_func)) {
		if (PyErr_Occurred())
			PyErr_Print(); /* Returns void. */
		Py_XDECREF(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))) { /* NEWREF */
		PyErr_Print(); /* Returns void. */
		Py_XDECREF(py_func);
		Py_XDECREF(py_mod);
		return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	}

	if (!(d = malloc(sizeof(struct sigrokdecode_decoder))))
		return SIGROKDECODE_ERR_MALLOC;

	if ((r = h_str(py_res, py_func, py_mod, "id", &(d->id))) < 0)
		return r;

	if ((r = h_str(py_res, py_func, py_mod, "name", &(d->name))) < 0)
		return r;

	if ((r = h_str(py_res, py_func, py_mod, "desc", &(d->desc))) < 0)
		return r;

	d->py_mod = py_mod;

	Py_XDECREF(py_res);
	Py_XDECREF(py_func);

	/* Get the 'decode' function name as Python callable object. */
	py_func = PyObject_GetAttrString(py_mod, "decode"); /* NEWREF */
	if (!py_func || !PyCallable_Check(py_func)) {
		if (PyErr_Occurred())
			PyErr_Print(); /* Returns void. */
		Py_XDECREF(py_mod);
		return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	}

	d->py_func = py_func;

	/* TODO: Handle inputformats, outputformats. */

	*dec = d;

	return SIGROKDECODE_OK;
}

/**
 * Run the specified decoder function.
 *
 * @param dec TODO
 * @param inbuf TODO
 * @param inbuflen TODO
 * @param outbuf TODO
 * @param outbuflen TODO
 *
 * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
 */
int sigrokdecode_run_decoder(struct sigrokdecode_decoder *dec,
			     uint8_t *inbuf, uint64_t inbuflen,
			     uint8_t **outbuf, uint64_t *outbuflen)
{
	PyObject *py_mod, *py_func, *py_args, *py_value, *py_res;
	int r, ret;

	/* TODO: Use #defines for the return codes. */

	/* Return an error upon unusable input. */
	if (dec == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (inbuf == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (inbuflen == 0) /* No point in working on empty buffers. */
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (outbuf == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (outbuflen == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */

	/* TODO: Error handling. */
	py_mod = dec->py_mod;
	Py_XINCREF(py_mod);
	py_func = dec->py_func;
	Py_XINCREF(py_func);

	/* Create a Python tuple of size 1. */
	if (!(py_args = PyTuple_New(1))) { /* NEWREF */
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_run_decref_func;
	}

	/* Get the input buffer as Python "string" (byte array). */
	/* TODO: int vs. uint64_t for 'inbuflen'? */
	if (!(py_value = Py_BuildValue("s#", inbuf, inbuflen))) { /* NEWREF */
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_run_decref_args;
	}

	/*
	 * IMPORTANT: PyTuple_SetItem() "steals" a reference to py_value!
	 * That means we are no longer responsible for Py_XDECREF()'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 */
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		Py_XDECREF(py_value); /* TODO: Ref. stolen upon error? */
		goto err_run_decref_args;
	}

	if (!(py_res = PyObject_CallObject(py_func, py_args))) { /* NEWREF */
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_run_decref_args;
	}

	if ((r = PyObject_AsCharBuffer(py_res, (const char **)outbuf,
				      (Py_ssize_t *)outbuflen))) {
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		Py_XDECREF(py_res);
		goto err_run_decref_args;
	}

	ret = SIGROKDECODE_OK;

	Py_XDECREF(py_res);

err_run_decref_args:
	Py_XDECREF(py_args);
err_run_decref_func:
	Py_XDECREF(py_func);
	Py_XDECREF(py_mod);

	if (PyErr_Occurred())
		PyErr_Print(); /* Returns void. */

	return ret;
}

/**
 * Shutdown libsigrokdecode.
 *
 * @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 SIGROKDECODE_OK;
}
Commit	Line	Data
1c6fa20f UH	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	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 2 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, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
	22	#include <stdio.h>
5c55017c	23	#include <string.h>
7c24d086	24	#include <dirent.h>
d842aebe	25	#include <config.h>
1c6fa20f	26
e6c7a826 UH	27	/* Re-define some string functions for Python >= 3.0. */
	28	#if PY_VERSION_HEX >= 0x03000000
	29	#define PyString_AsString PyBytes_AsString
	30	#define PyString_FromString PyBytes_FromString
	31	#define PyString_Check PyBytes_Check
	32	#endif
	33
7c24d086	34	/* The list of protocol decoders. */
871d21e2	35	GSList *list_pds = NULL;
7c24d086	36
f800adc4 UH	37	/*
	38	* Here's a quick overview of Python/C API reference counting.
	39	*
	40	* Check the Python/C API docs for what type of reference a function returns.
	41	*
2557ad9d	42	* - If it returns a "new reference", you're responsible to Py_XDECREF() it.
f800adc4	43	*
2557ad9d	44	* - If it returns a "borrowed reference", you MUST NOT Py_XDECREF() it.
f800adc4 UH	45	*
f800adc4 UH	46	* - If a function "steals" a reference, you no longer are responsible for
2557ad9d	47	* Py_XDECREF()ing it (someone else will do it for you at some point).
f800adc4 UH	48	*/
f800adc4 UH	49
1c6fa20f UH	50	/**
	51	* Initialize libsigrokdecode.
	52	*
70e44845	53	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f UH	54	*/
	55	int sigrokdecode_init(void)
	56	{
7c24d086 UH	57	DIR *dir;
	58	struct dirent *dp;
	59	char *tmp;
	60
1c6fa20f UH	61	/* Py_Initialize() returns void and usually cannot fail. */
	62	Py_Initialize();
	63
0895f56a	64	/* Add search directory for the protocol decoders. */
2454527d	65	/* FIXME: Check error code. */
70e44845	66	/* FIXME: What happens if this function is called multiple times? */
0895f56a	67	PyRun_SimpleString("import sys;"
10426068	68	"sys.path.append(r'" DECODERS_DIR "');");
1c6fa20f	69
7c24d086 UH	70	if (!(dir = opendir(DECODERS_DIR)))
	71	return SIGROKDECODE_ERR_DECODERS_DIR;
	72
	73	while ((dp = readdir(dir)) != NULL) {
276b55eb	74	if (!g_str_has_suffix(dp->d_name, ".py"))
7c24d086	75	continue;
5b05904d UH	76	/* For now use the filename (without .py) as decoder name. */
5b05904d UH	77	if ((tmp = g_strndup(dp->d_name, strlen(dp->d_name) - 3)))
7c24d086 UH	78	list_pds = g_slist_append(list_pds, tmp);
	79	}
	80	closedir(dir);
	81
70e44845	82	return SIGROKDECODE_OK;
1c6fa20f UH	83	}
1c6fa20f UH	84
871d21e2 UH	85	/**
	86	* Returns the list of supported/loaded protocol decoders.
	87	*
	88	* This is a GSList containing the names of the decoders as strings.
	89	*
	90	* @return List of decoders, NULL if none are supported or loaded.
	91	*/
	92	GSList *sigrokdecode_list_decoders(void)
	93	{
	94	return list_pds;
	95	}
	96
5c55017c UH	97	/**
	98	* Helper function to handle Python strings.
	99	*
	100	* TODO: @param entries.
	101	*
3a9a7e38	102	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
70e44845	103	* The 'outstr' argument points to a malloc()ed string upon success.
5c55017c UH	104	*/
	105	static int h_str(PyObject py_res, PyObject py_func, PyObject *py_mod,
	106	const char key, char *outstr)
	107	{
	108	PyObject *py_str;
	109	char *str;
f7313eea	110	int ret;
5c55017c UH	111
	112	py_str = PyMapping_GetItemString(py_res, (char *)key);
	113	if (!py_str \|\| !PyString_Check(py_str)) {
f7313eea UH	114	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
f7313eea UH	115	goto err_h_decref_func;
5c55017c UH	116	}
5c55017c UH	117
6b08da24 UH	118	/*
	119	* PyString_AsString()'s returned string refers to an internal buffer
	120	* (not a copy), i.e. the data must not be modified, and the memory
	121	* must not be free()'d.
	122	*/
5c55017c	123	if (!(str = PyString_AsString(py_str))) {
f7313eea UH	124	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
f7313eea UH	125	goto err_h_decref_str;
5c55017c UH	126	}
	127
	128	if (!(*outstr = strdup(str))) {
f7313eea UH	129	ret = SIGROKDECODE_ERR_MALLOC;
f7313eea UH	130	goto err_h_decref_str;
5c55017c UH	131	}
5c55017c UH	132
2557ad9d	133	Py_XDECREF(py_str);
5c55017c	134
70e44845	135	return SIGROKDECODE_OK;
f7313eea UH	136
	137	err_h_decref_str:
	138	Py_XDECREF(py_str);
	139	err_h_decref_func:
	140	Py_XDECREF(py_func);
f7313eea UH	141	Py_XDECREF(py_mod);
	142
	143	if (PyErr_Occurred())
	144	PyErr_Print(); /* Returns void. */
	145
	146	return ret;
5c55017c UH	147	}
5c55017c UH	148
1c6fa20f UH	149	/**
	150	* TODO
	151	*
	152	* @param name TODO
70e44845	153	*
3a9a7e38	154	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f	155	*/
5c55017c UH	156	int sigrokdecode_load_decoder(const char *name,
5c55017c UH	157	struct sigrokdecode_decoder **dec)
1c6fa20f	158	{
5c55017c	159	struct sigrokdecode_decoder *d;
c7bb5dff	160	PyObject py_mod, py_func, py_res / , py_tuple /;
5c55017c UH	161	int r;
5c55017c UH	162
5c55017c	163	/* "Import" the Python module. */
c7bb5dff	164	if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */
6b08da24	165	PyErr_Print(); /* Returns void. */
5c55017c UH	166	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
5c55017c UH	167	}
5c55017c UH	168
5c55017c UH	169	/* Get the 'register' function name as Python callable object. */
6b08da24	170	py_func = PyObject_GetAttrString(py_mod, "register"); /* NEWREF */
5c55017c UH	171	if (!py_func \|\| !PyCallable_Check(py_func)) {
5c55017c UH	172	if (PyErr_Occurred())
6b08da24	173	PyErr_Print(); /* Returns void. */
2557ad9d	174	Py_XDECREF(py_mod);
5c55017c UH	175	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	176	}
	177
	178	/* Call the 'register' function without arguments, get the result. */
6b08da24 UH	179	if (!(py_res = PyObject_CallFunction(py_func, NULL))) { /* NEWREF */
6b08da24 UH	180	PyErr_Print(); /* Returns void. */
2557ad9d UH	181	Py_XDECREF(py_func);
2557ad9d UH	182	Py_XDECREF(py_mod);
5c55017c UH	183	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	184	}
	185
	186	if (!(d = malloc(sizeof(struct sigrokdecode_decoder))))
	187	return SIGROKDECODE_ERR_MALLOC;
	188
	189	if ((r = h_str(py_res, py_func, py_mod, "id", &(d->id))) < 0)
	190	return r;
	191
	192	if ((r = h_str(py_res, py_func, py_mod, "name", &(d->name))) < 0)
	193	return r;
	194
	195	if ((r = h_str(py_res, py_func, py_mod, "desc", &(d->desc))) < 0)
	196	return r;
	197
	198	d->py_mod = py_mod;
	199
2557ad9d UH	200	Py_XDECREF(py_res);
2557ad9d UH	201	Py_XDECREF(py_func);
5c55017c UH	202
5c55017c UH	203	/* Get the 'decode' function name as Python callable object. */
6b08da24	204	py_func = PyObject_GetAttrString(py_mod, "decode"); /* NEWREF */
5c55017c UH	205	if (!py_func \|\| !PyCallable_Check(py_func)) {
5c55017c UH	206	if (PyErr_Occurred())
6b08da24	207	PyErr_Print(); /* Returns void. */
2557ad9d	208	Py_XDECREF(py_mod);
5c55017c UH	209	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	210	}
	211
	212	d->py_func = py_func;
	213
	214	/* TODO: Handle inputformats, outputformats. */
	215
	216	*dec = d;
910e5fd8	217
70e44845	218	return SIGROKDECODE_OK;
1c6fa20f UH	219	}
	220
	221	/**
	222	* Run the specified decoder function.
	223	*
5c55017c	224	* @param dec TODO
1c6fa20f UH	225	* @param inbuf TODO
	226	* @param inbuflen TODO
	227	* @param outbuf TODO
	228	* @param outbuflen TODO
70e44845	229	*
3a9a7e38	230	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f	231	*/
5c55017c	232	int sigrokdecode_run_decoder(struct sigrokdecode_decoder *dec,
2b45dd71	233	uint8_t *inbuf, uint64_t inbuflen,
2b45dd71	234	uint8_t *outbuf, uint64_t outbuflen)
1c6fa20f	235	{
5c55017c	236	PyObject py_mod, py_func, py_args, py_value, *py_res;
036e6f67	237	int r, ret;
1c6fa20f UH	238
	239	/* TODO: Use #defines for the return codes. */
	240
	241	/* Return an error upon unusable input. */
5c55017c UH	242	if (dec == NULL)
5c55017c UH	243	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	244	if (inbuf == NULL)
5c55017c	245	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	246	if (inbuflen == 0) /* No point in working on empty buffers. */
5c55017c	247	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	248	if (outbuf == NULL)
5c55017c	249	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	250	if (outbuflen == NULL)
5c55017c	251	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	252
5c55017c UH	253	/* TODO: Error handling. */
5c55017c UH	254	py_mod = dec->py_mod;
2557ad9d	255	Py_XINCREF(py_mod);
5c55017c	256	py_func = dec->py_func;
2557ad9d	257	Py_XINCREF(py_func);
1c6fa20f UH	258
1c6fa20f UH	259	/* Create a Python tuple of size 1. */
6b08da24	260	if (!(py_args = PyTuple_New(1))) { /* NEWREF */
036e6f67 UH	261	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
036e6f67 UH	262	goto err_run_decref_func;
1c6fa20f UH	263	}
	264
	265	/* Get the input buffer as Python "string" (byte array). */
	266	/* TODO: int vs. uint64_t for 'inbuflen'? */
6b08da24	267	if (!(py_value = Py_BuildValue("s#", inbuf, inbuflen))) { /* NEWREF */
036e6f67 UH	268	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
036e6f67 UH	269	goto err_run_decref_args;
1c6fa20f UH	270	}
1c6fa20f UH	271
f800adc4 UH	272	/*
f800adc4 UH	273	* IMPORTANT: PyTuple_SetItem() "steals" a reference to py_value!
2557ad9d	274	* That means we are no longer responsible for Py_XDECREF()'ing it.
f800adc4 UH	275	* It will automatically be free'd when the 'py_args' tuple is free'd.
f800adc4 UH	276	*/
6b08da24	277	if (PyTuple_SetItem(py_args, 0, py_value) != 0) { /* STEAL */
036e6f67	278	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
2557ad9d	279	Py_XDECREF(py_value); /* TODO: Ref. stolen upon error? */
036e6f67	280	goto err_run_decref_args;
1c6fa20f UH	281	}
1c6fa20f UH	282
6b08da24	283	if (!(py_res = PyObject_CallObject(py_func, py_args))) { /* NEWREF */
036e6f67 UH	284	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
036e6f67 UH	285	goto err_run_decref_args;
1c6fa20f UH	286	}
1c6fa20f UH	287
036e6f67 UH	288	if ((r = PyObject_AsCharBuffer(py_res, (const char **)outbuf,
	289	(Py_ssize_t *)outbuflen))) {
	290	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
2557ad9d	291	Py_XDECREF(py_res);
036e6f67	292	goto err_run_decref_args;
1c6fa20f UH	293	}
1c6fa20f UH	294
036e6f67 UH	295	ret = SIGROKDECODE_OK;
036e6f67 UH	296
2557ad9d	297	Py_XDECREF(py_res);
036e6f67 UH	298
036e6f67 UH	299	err_run_decref_args:
2557ad9d	300	Py_XDECREF(py_args);
036e6f67	301	err_run_decref_func:
2557ad9d	302	Py_XDECREF(py_func);
2557ad9d	303	Py_XDECREF(py_mod);
1c6fa20f	304
036e6f67 UH	305	if (PyErr_Occurred())
	306	PyErr_Print(); /* Returns void. */
	307
	308	return ret;
1c6fa20f UH	309	}
	310
	311	/**
	312	* Shutdown libsigrokdecode.
	313	*
3a9a7e38	314	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f UH	315	*/
	316	int sigrokdecode_shutdown(void)
	317	{
	318	/* Py_Finalize() returns void, any finalization errors are ignored. */
	319	Py_Finalize();
	320
70e44845	321	return SIGROKDECODE_OK;
1c6fa20f	322	}