[libsigrok.git] / output / gnuplot.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 <stdlib.h>
#include <string.h>
#include <glib.h>
#include "config.h"
#include "sigrok.h"
#include "sigrok-internal.h"

struct context {
	unsigned int num_enabled_probes;
	unsigned int unitsize;
	char *probelist[SR_MAX_NUM_PROBES + 1];
	char *header;
};

#define MAX_HEADER_LEN \
	(1024 + (SR_MAX_NUM_PROBES * (SR_MAX_PROBENAME_LEN + 10)))

static const char *gnuplot_header = "\
# Sample data in space-separated columns format usable by gnuplot\n\
#\n\
# Generated by: %s on %s%s\
# Period: %s\n\
#\n\
# Column\tProbe\n\
# -------------------------------------\
----------------------------------------\n\
# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";

static const char *gnuplot_header_comment = "\
# Comment: Acquisition with %d/%d probes at %s\n";

static int init(struct sr_output *o)
{
	struct context *ctx;
	struct sr_probe *probe;
	GSList *l;
	uint64_t samplerate;
	unsigned int i;
	int b, num_probes;
	char *c, *frequency_s;
	char wbuf[1000], comment[128];
	time_t t;

	if (!o) {
		sr_err("gnuplot out: %s: o was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!o->dev) {
		sr_err("gnuplot out: %s: o->dev was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!o->dev->plugin) {
		sr_err("gnuplot out: %s: o->dev->plugin was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
		sr_err("gnuplot out: %s: ctx malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	if (!(ctx->header = g_try_malloc0(MAX_HEADER_LEN + 1))) {
		sr_err("gnuplot out: %s: ctx->header malloc failed", __func__);
		g_free(ctx);
		return SR_ERR_MALLOC;
	}

	o->internal = ctx;
	ctx->num_enabled_probes = 0;
	for (l = o->dev->probes; l; l = l->next) {
		probe = l->data; /* TODO: Error checks. */
		if (!probe->enabled)
			continue;
		ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	}
	ctx->probelist[ctx->num_enabled_probes] = 0;
	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;

	num_probes = g_slist_length(o->dev->probes);
	comment[0] = '\0';
	if (sr_dev_has_hwcap(o->dev, SR_HWCAP_SAMPLERATE)) {
		samplerate = *((uint64_t *) o->dev->plugin->get_dev_info(
				o->dev->plugin_index, SR_DI_CUR_SAMPLERATE));
		if (!(frequency_s = sr_samplerate_string(samplerate))) {
			sr_err("gnuplot out: %s: sr_samplerate_string failed",
			       __func__);
			g_free(ctx->header);
			g_free(ctx);
			return SR_ERR;
		}
		snprintf(comment, 127, gnuplot_header_comment,
			ctx->num_enabled_probes, num_probes, frequency_s);
		g_free(frequency_s);
	}

	/* Columns / channels */
	wbuf[0] = '\0';
	for (i = 0; i < ctx->num_enabled_probes; i++) {
		c = (char *)&wbuf + strlen((char *)&wbuf);
		sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	}

	if (!(frequency_s = sr_period_string(samplerate))) {
		sr_err("gnuplot out: %s: sr_period_string failed", __func__);
		g_free(ctx->header);
		g_free(ctx);
		return SR_ERR;
	}

	t = time(NULL);
	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
		     PACKAGE_STRING, ctime(&t), comment, frequency_s,
		     (char *)&wbuf);
	g_free(frequency_s);

	if (b < 0) {
		sr_err("gnuplot out: %s: sprintf failed", __func__);
		g_free(ctx->header);
		g_free(ctx);
		return SR_ERR;
	}

	return 0;
}

static int event(struct sr_output *o, int event_type, char **data_out,
		 uint64_t *length_out)
{
	struct context *ctx;

	if (!o) {
		sr_err("gnuplot out: %s: o was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!data_out) {
		sr_err("gnuplot out: %s: data_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!length_out) {
		sr_err("gnuplot out: %s: length_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	ctx = o->internal;

	switch (event_type) {
	case SR_DF_TRIGGER:
		/* TODO: Can a trigger mark be in a gnuplot data file? */
		break;
	case SR_DF_END:
		g_free(o->internal);
		o->internal = NULL;
		break;
	default:
		sr_err("gnuplot out: %s: unsupported event type: %d",
		       __func__, event_type);
		break;
	}

	*data_out = NULL;
	*length_out = 0;

	return SR_OK;
}

static int data(struct sr_output *o, const char *data_in, uint64_t length_in,
		char **data_out, uint64_t *length_out)
{
	struct context *ctx;
	unsigned int max_linelen, outsize, p, curbit, i;
	uint64_t sample;
	static uint64_t samplecount = 0, old_sample = 0;
	char *outbuf, *c;

	if (!o) {
		sr_err("gnuplot out: %s: o was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!o->internal) {
		sr_err("gnuplot out: %s: o->internal was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!data_in) {
		sr_err("gnuplot out: %s: data_in was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!data_out) {
		sr_err("gnuplot out: %s: data_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!length_out) {
		sr_err("gnuplot out: %s: length_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	ctx = o->internal;
	max_linelen = 16 + ctx->num_enabled_probes * 2;
	outsize = length_in / ctx->unitsize * max_linelen;
	if (ctx->header)
		outsize += strlen(ctx->header);

	if (!(outbuf = g_try_malloc0(outsize))) {
		sr_err("gnuplot out: %s: outbuf malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	outbuf[0] = '\0';
	if (ctx->header) {
		/* The header is still here, this must be the first packet. */
		strncpy(outbuf, ctx->header, outsize);
		g_free(ctx->header);
		ctx->header = NULL;
	}

	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {

		memcpy(&sample, data_in + i, ctx->unitsize);

		/*
		 * Don't output the same samples multiple times. However, make
		 * sure to output at least the first and last sample.
		 */
		if (samplecount++ != 0 && sample == old_sample) {
			if (i != (length_in - ctx->unitsize))
				continue;
		}
		old_sample = sample;

		/* The first column is a counter (needed for gnuplot). */
		c = outbuf + strlen(outbuf);
		sprintf(c, "%" PRIu64 "\t", samplecount++);

		/* The next columns are the values of all channels. */
		for (p = 0; p < ctx->num_enabled_probes; p++) {
			curbit = (sample & ((uint64_t) (1 << p))) >> p;
			c = outbuf + strlen(outbuf);
			sprintf(c, "%d ", curbit);
		}

		c = outbuf + strlen(outbuf);
		sprintf(c, "\n");
	}

	*data_out = outbuf;
	*length_out = strlen(outbuf);

	return SR_OK;
}

SR_PRIV struct sr_output_format output_gnuplot = {
	.id = "gnuplot",
	.description = "Gnuplot",
	.df_type = SR_DF_LOGIC,
	.init = init,
	.data = data,
	.event = event,
};

/* Temporarily disabled. */
#if 0
static int analog_init(struct sr_output *o)
{
	struct context *ctx;
	struct sr_probe *probe;
	GSList *l;
	uint64_t samplerate;
	unsigned int i;
	int b, num_probes;
	char *c, *frequency_s;
	char wbuf[1000], comment[128];
	time_t t;

	if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
		sr_err("gnuplot out: %s: ctx malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	if (!(ctx->header = g_try_malloc0(MAX_HEADER_LEN + 1))) {
		g_free(ctx);
		sr_err("gnuplot out: %s: ctx->header malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	o->internal = ctx;
	ctx->num_enabled_probes = 0;
	for (l = o->dev->probes; l; l = l->next) {
		probe = l->data;
		if (!probe->enabled)
			continue;
		ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	}
	ctx->probelist[ctx->num_enabled_probes] = 0;
//	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
	ctx->unitsize = sizeof(struct sr_analog_sample) +
			(ctx->num_enabled_probes * sizeof(struct sr_analog_probe));

	num_probes = g_slist_length(o->dev->probes);
	comment[0] = '\0';
	if (o->dev->plugin && sr_dev_has_hwcap(o->dev, SR_HWCAP_SAMPLERATE)) {
		samplerate = *((uint64_t *) o->dev->plugin->get_dev_info(
				o->dev->plugin_index, SR_DI_CUR_SAMPLERATE));
		if (!(frequency_s = sr_samplerate_string(samplerate))) {
			g_free(ctx->header);
			g_free(ctx);
			return SR_ERR;
		}
		snprintf(comment, 127, gnuplot_header_comment,
			ctx->num_enabled_probes, num_probes, frequency_s);
		g_free(frequency_s);
	}

	/* Columns / channels */
	wbuf[0] = '\0';
	for (i = 0; i < ctx->num_enabled_probes; i++) {
		c = (char *)&wbuf + strlen((char *)&wbuf);
		sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	}

	if (!(frequency_s = sr_period_string(samplerate))) {
		g_free(ctx->header);
		g_free(ctx);
		return SR_ERR;
	}
	t = time(NULL);
	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
		     PACKAGE_STRING, ctime(&t), comment, frequency_s,
		     (char *)&wbuf);
	g_free(frequency_s);

	if (b < 0) {
		g_free(ctx->header);
		g_free(ctx);
		return SR_ERR;
	}

	return 0;
}

static int analog_data(struct sr_output *o, char *data_in, uint64_t length_in,
		char **data_out, uint64_t *length_out)
{
	struct context *ctx;
	unsigned int max_linelen, outsize, p, /* curbit, */ i;
//	uint64_t sample;
	static uint64_t samplecount = 0;
	char *outbuf, *c;
	struct sr_analog_sample *sample;

	ctx = o->internal;
//	max_linelen = 16 + ctx->num_enabled_probes * 2;
	max_linelen = 16 + ctx->num_enabled_probes * 30;
	outsize = length_in / ctx->unitsize * max_linelen;
	if (ctx->header)
		outsize += strlen(ctx->header);

	if (!(outbuf = g_try_malloc0(outsize))) {
		sr_err("gnuplot out: %s: outbuf malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	outbuf[0] = '\0';
	if (ctx->header) {
		/* The header is still here, this must be the first packet. */
		strncpy(outbuf, ctx->header, outsize);
		g_free(ctx->header);
		ctx->header = NULL;
	}

	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
//		memcpy(&sample, data_in + i, ctx->unitsize);
		sample = (struct sr_analog_sample *) (data_in + i);

		/* The first column is a counter (needed for gnuplot). */
		c = outbuf + strlen(outbuf);
		sprintf(c, "%" PRIu64 "\t", samplecount++);

		/* The next columns are the values of all channels. */
		for (p = 0; p < ctx->num_enabled_probes; p++) {
//			curbit = (sample & ((uint64_t) (1 << p))) >> p;
			c = outbuf + strlen(outbuf);
//			sprintf(c, "%d ", curbit);
			/*
			 * FIXME: Should be doing proper raw->voltage conversion
			 * here, casting to int16_t isn't it. Remember that if
			 * res = 1 conversion isn't necessary.
			 */
			sprintf(c, "%f ", (double) ((int16_t) (sample->probes[p].val &
					((1 << sample->probes[p].res) - 1))));
		}

		c = outbuf + strlen(outbuf);
		sprintf(c, "\n");
	}

	*data_out = outbuf;
	*length_out = strlen(outbuf);

	return SR_OK;
}

struct sr_output_format output_analog_gnuplot = {
	.id = "analog_gnuplot",
	.description = "Gnuplot analog",
	.df_type = SR_DF_ANALOG,
	.init = analog_init,
	.data = analog_data,
	.event = event,
};
#endif
Commit	Line	Data
	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 <stdlib.h>
	22	#include <string.h>
	23	#include <glib.h>
	24	#include "config.h"
	25	#include "sigrok.h"
	26	#include "sigrok-internal.h"
	27
	28	struct context {
	29	unsigned int num_enabled_probes;
	30	unsigned int unitsize;
	31	char *probelist[SR_MAX_NUM_PROBES + 1];
	32	char *header;
	33	};
	34
	35	#define MAX_HEADER_LEN \
	36	(1024 + (SR_MAX_NUM_PROBES * (SR_MAX_PROBENAME_LEN + 10)))
	37
	38	static const char *gnuplot_header = "\
	39	# Sample data in space-separated columns format usable by gnuplot\n\
	40	#\n\
	41	# Generated by: %s on %s%s\
	42	# Period: %s\n\
	43	#\n\
	44	# Column\tProbe\n\
	45	# -------------------------------------\
	46	----------------------------------------\n\
	47	# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";
	48
	49	static const char *gnuplot_header_comment = "\
	50	# Comment: Acquisition with %d/%d probes at %s\n";
	51
	52	static int init(struct sr_output *o)
	53	{
	54	struct context *ctx;
	55	struct sr_probe *probe;
	56	GSList *l;
	57	uint64_t samplerate;
	58	unsigned int i;
	59	int b, num_probes;
	60	char c, frequency_s;
	61	char wbuf[1000], comment[128];
	62	time_t t;
	63
	64	if (!o) {
	65	sr_err("gnuplot out: %s: o was NULL", __func__);
	66	return SR_ERR_ARG;
	67	}
	68
	69	if (!o->dev) {
	70	sr_err("gnuplot out: %s: o->dev was NULL", __func__);
	71	return SR_ERR_ARG;
	72	}
	73
	74	if (!o->dev->plugin) {
	75	sr_err("gnuplot out: %s: o->dev->plugin was NULL", __func__);
	76	return SR_ERR_ARG;
	77	}
	78
	79	if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
	80	sr_err("gnuplot out: %s: ctx malloc failed", __func__);
	81	return SR_ERR_MALLOC;
	82	}
	83
	84	if (!(ctx->header = g_try_malloc0(MAX_HEADER_LEN + 1))) {
	85	sr_err("gnuplot out: %s: ctx->header malloc failed", __func__);
	86	g_free(ctx);
	87	return SR_ERR_MALLOC;
	88	}
	89
	90	o->internal = ctx;
	91	ctx->num_enabled_probes = 0;
	92	for (l = o->dev->probes; l; l = l->next) {
	93	probe = l->data; /* TODO: Error checks. */
	94	if (!probe->enabled)
	95	continue;
	96	ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	97	}
	98	ctx->probelist[ctx->num_enabled_probes] = 0;
	99	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
	100
	101	num_probes = g_slist_length(o->dev->probes);
	102	comment[0] = '\0';
	103	if (sr_dev_has_hwcap(o->dev, SR_HWCAP_SAMPLERATE)) {
	104	samplerate = ((uint64_t ) o->dev->plugin->get_dev_info(
	105	o->dev->plugin_index, SR_DI_CUR_SAMPLERATE));
	106	if (!(frequency_s = sr_samplerate_string(samplerate))) {
	107	sr_err("gnuplot out: %s: sr_samplerate_string failed",
	108	__func__);
	109	g_free(ctx->header);
	110	g_free(ctx);
	111	return SR_ERR;
	112	}
	113	snprintf(comment, 127, gnuplot_header_comment,
	114	ctx->num_enabled_probes, num_probes, frequency_s);
	115	g_free(frequency_s);
	116	}
	117
	118	/* Columns / channels */
	119	wbuf[0] = '\0';
	120	for (i = 0; i < ctx->num_enabled_probes; i++) {
	121	c = (char )&wbuf + strlen((char )&wbuf);
	122	sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	123	}
	124
	125	if (!(frequency_s = sr_period_string(samplerate))) {
	126	sr_err("gnuplot out: %s: sr_period_string failed", __func__);
	127	g_free(ctx->header);
	128	g_free(ctx);
	129	return SR_ERR;
	130	}
	131
	132	t = time(NULL);
	133	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
	134	PACKAGE_STRING, ctime(&t), comment, frequency_s,
	135	(char *)&wbuf);
	136	g_free(frequency_s);
	137
	138	if (b < 0) {
	139	sr_err("gnuplot out: %s: sprintf failed", __func__);
	140	g_free(ctx->header);
	141	g_free(ctx);
	142	return SR_ERR;
	143	}
	144
	145	return 0;
	146	}
	147
	148	static int event(struct sr_output o, int event_type, char *data_out,
	149	uint64_t *length_out)
	150	{
	151	struct context *ctx;
	152
	153	if (!o) {
	154	sr_err("gnuplot out: %s: o was NULL", __func__);
	155	return SR_ERR_ARG;
	156	}
	157
	158	if (!data_out) {
	159	sr_err("gnuplot out: %s: data_out was NULL", __func__);
	160	return SR_ERR_ARG;
	161	}
	162
	163	if (!length_out) {
	164	sr_err("gnuplot out: %s: length_out was NULL", __func__);
	165	return SR_ERR_ARG;
	166	}
	167
	168	ctx = o->internal;
	169
	170	switch (event_type) {
	171	case SR_DF_TRIGGER:
	172	/* TODO: Can a trigger mark be in a gnuplot data file? */
	173	break;
	174	case SR_DF_END:
	175	g_free(o->internal);
	176	o->internal = NULL;
	177	break;
	178	default:
	179	sr_err("gnuplot out: %s: unsupported event type: %d",
	180	__func__, event_type);
	181	break;
	182	}
	183
	184	*data_out = NULL;
	185	*length_out = 0;
	186
	187	return SR_OK;
	188	}
	189
	190	static int data(struct sr_output o, const char data_in, uint64_t length_in,
	191	char *data_out, uint64_t length_out)
	192	{
	193	struct context *ctx;
	194	unsigned int max_linelen, outsize, p, curbit, i;
	195	uint64_t sample;
	196	static uint64_t samplecount = 0, old_sample = 0;
	197	char outbuf, c;
	198
	199	if (!o) {
	200	sr_err("gnuplot out: %s: o was NULL", __func__);
	201	return SR_ERR_ARG;
	202	}
	203
	204	if (!o->internal) {
	205	sr_err("gnuplot out: %s: o->internal was NULL", __func__);
	206	return SR_ERR_ARG;
	207	}
	208
	209	if (!data_in) {
	210	sr_err("gnuplot out: %s: data_in was NULL", __func__);
	211	return SR_ERR_ARG;
	212	}
	213
	214	if (!data_out) {
	215	sr_err("gnuplot out: %s: data_out was NULL", __func__);
	216	return SR_ERR_ARG;
	217	}
	218
	219	if (!length_out) {
	220	sr_err("gnuplot out: %s: length_out was NULL", __func__);
	221	return SR_ERR_ARG;
	222	}
	223
	224	ctx = o->internal;
	225	max_linelen = 16 + ctx->num_enabled_probes * 2;
	226	outsize = length_in / ctx->unitsize * max_linelen;
	227	if (ctx->header)
	228	outsize += strlen(ctx->header);
	229
	230	if (!(outbuf = g_try_malloc0(outsize))) {
	231	sr_err("gnuplot out: %s: outbuf malloc failed", __func__);
	232	return SR_ERR_MALLOC;
	233	}
	234
	235	outbuf[0] = '\0';
	236	if (ctx->header) {
	237	/* The header is still here, this must be the first packet. */
	238	strncpy(outbuf, ctx->header, outsize);
	239	g_free(ctx->header);
	240	ctx->header = NULL;
	241	}
	242
	243	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
	244
	245	memcpy(&sample, data_in + i, ctx->unitsize);
	246
	247	/*
	248	* Don't output the same samples multiple times. However, make
	249	* sure to output at least the first and last sample.
	250	*/
	251	if (samplecount++ != 0 && sample == old_sample) {
	252	if (i != (length_in - ctx->unitsize))
	253	continue;
	254	}
	255	old_sample = sample;
	256
	257	/* The first column is a counter (needed for gnuplot). */
	258	c = outbuf + strlen(outbuf);
	259	sprintf(c, "%" PRIu64 "\t", samplecount++);
	260
	261	/* The next columns are the values of all channels. */
	262	for (p = 0; p < ctx->num_enabled_probes; p++) {
	263	curbit = (sample & ((uint64_t) (1 << p))) >> p;
	264	c = outbuf + strlen(outbuf);
	265	sprintf(c, "%d ", curbit);
	266	}
	267
	268	c = outbuf + strlen(outbuf);
	269	sprintf(c, "\n");
	270	}
	271
	272	*data_out = outbuf;
	273	*length_out = strlen(outbuf);
	274
	275	return SR_OK;
	276	}
	277
	278	SR_PRIV struct sr_output_format output_gnuplot = {
	279	.id = "gnuplot",
	280	.description = "Gnuplot",
	281	.df_type = SR_DF_LOGIC,
	282	.init = init,
	283	.data = data,
	284	.event = event,
	285	};
	286
	287	/* Temporarily disabled. */
	288	#if 0
	289	static int analog_init(struct sr_output *o)
	290	{
	291	struct context *ctx;
	292	struct sr_probe *probe;
	293	GSList *l;
	294	uint64_t samplerate;
	295	unsigned int i;
	296	int b, num_probes;
	297	char c, frequency_s;
	298	char wbuf[1000], comment[128];
	299	time_t t;
	300
	301	if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
	302	sr_err("gnuplot out: %s: ctx malloc failed", __func__);
	303	return SR_ERR_MALLOC;
	304	}
	305
	306	if (!(ctx->header = g_try_malloc0(MAX_HEADER_LEN + 1))) {
	307	g_free(ctx);
	308	sr_err("gnuplot out: %s: ctx->header malloc failed", __func__);
	309	return SR_ERR_MALLOC;
	310	}
	311
	312	o->internal = ctx;
	313	ctx->num_enabled_probes = 0;
	314	for (l = o->dev->probes; l; l = l->next) {
	315	probe = l->data;
	316	if (!probe->enabled)
	317	continue;
	318	ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	319	}
	320	ctx->probelist[ctx->num_enabled_probes] = 0;
	321	// ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
	322	ctx->unitsize = sizeof(struct sr_analog_sample) +
	323	(ctx->num_enabled_probes * sizeof(struct sr_analog_probe));
	324
	325	num_probes = g_slist_length(o->dev->probes);
	326	comment[0] = '\0';
	327	if (o->dev->plugin && sr_dev_has_hwcap(o->dev, SR_HWCAP_SAMPLERATE)) {
	328	samplerate = ((uint64_t ) o->dev->plugin->get_dev_info(
	329	o->dev->plugin_index, SR_DI_CUR_SAMPLERATE));
	330	if (!(frequency_s = sr_samplerate_string(samplerate))) {
	331	g_free(ctx->header);
	332	g_free(ctx);
	333	return SR_ERR;
	334	}
	335	snprintf(comment, 127, gnuplot_header_comment,
	336	ctx->num_enabled_probes, num_probes, frequency_s);
	337	g_free(frequency_s);
	338	}
	339
	340	/* Columns / channels */
	341	wbuf[0] = '\0';
	342	for (i = 0; i < ctx->num_enabled_probes; i++) {
	343	c = (char )&wbuf + strlen((char )&wbuf);
	344	sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	345	}
	346
	347	if (!(frequency_s = sr_period_string(samplerate))) {
	348	g_free(ctx->header);
	349	g_free(ctx);
	350	return SR_ERR;
	351	}
	352	t = time(NULL);
	353	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
	354	PACKAGE_STRING, ctime(&t), comment, frequency_s,
	355	(char *)&wbuf);
	356	g_free(frequency_s);
	357
	358	if (b < 0) {
	359	g_free(ctx->header);
	360	g_free(ctx);
	361	return SR_ERR;
	362	}
	363
	364	return 0;
	365	}
	366
	367	static int analog_data(struct sr_output o, char data_in, uint64_t length_in,
	368	char *data_out, uint64_t length_out)
	369	{
	370	struct context *ctx;
	371	unsigned int max_linelen, outsize, p, /* curbit, */ i;
	372	// uint64_t sample;
	373	static uint64_t samplecount = 0;
	374	char outbuf, c;
	375	struct sr_analog_sample *sample;
	376
	377	ctx = o->internal;
	378	// max_linelen = 16 + ctx->num_enabled_probes * 2;
	379	max_linelen = 16 + ctx->num_enabled_probes * 30;
	380	outsize = length_in / ctx->unitsize * max_linelen;
	381	if (ctx->header)
	382	outsize += strlen(ctx->header);
	383
	384	if (!(outbuf = g_try_malloc0(outsize))) {
	385	sr_err("gnuplot out: %s: outbuf malloc failed", __func__);
	386	return SR_ERR_MALLOC;
	387	}
	388
	389	outbuf[0] = '\0';
	390	if (ctx->header) {
	391	/* The header is still here, this must be the first packet. */
	392	strncpy(outbuf, ctx->header, outsize);
	393	g_free(ctx->header);
	394	ctx->header = NULL;
	395	}
	396
	397	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
	398	// memcpy(&sample, data_in + i, ctx->unitsize);
	399	sample = (struct sr_analog_sample *) (data_in + i);
	400
	401	/* The first column is a counter (needed for gnuplot). */
	402	c = outbuf + strlen(outbuf);
	403	sprintf(c, "%" PRIu64 "\t", samplecount++);
	404
	405	/* The next columns are the values of all channels. */
	406	for (p = 0; p < ctx->num_enabled_probes; p++) {
	407	// curbit = (sample & ((uint64_t) (1 << p))) >> p;
	408	c = outbuf + strlen(outbuf);
	409	// sprintf(c, "%d ", curbit);
	410	/*
	411	* FIXME: Should be doing proper raw->voltage conversion
	412	* here, casting to int16_t isn't it. Remember that if
	413	* res = 1 conversion isn't necessary.
	414	*/
	415	sprintf(c, "%f ", (double) ((int16_t) (sample->probes[p].val &
	416	((1 << sample->probes[p].res) - 1))));
	417	}
	418
	419	c = outbuf + strlen(outbuf);
	420	sprintf(c, "\n");
	421	}
	422
	423	*data_out = outbuf;
	424	*length_out = strlen(outbuf);
	425
	426	return SR_OK;
	427	}
	428
	429	struct sr_output_format output_analog_gnuplot = {
	430	.id = "analog_gnuplot",
	431	.description = "Gnuplot analog",
	432	.df_type = SR_DF_ANALOG,
	433	.init = analog_init,
	434	.data = analog_data,
	435	.event = event,
	436	};
	437	#endif