[libsigrok.git] / output / 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 <sigrok.h>
#include "config.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 (!(ctx = calloc(1, sizeof(struct context))))
		return SR_ERR_MALLOC;

	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
		free(ctx);
		return SR_ERR_MALLOC;
	}

	o->internal = ctx;
	ctx->num_enabled_probes = 0;
	for (l = o->device->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;

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

	if (b < 0) {
		free(ctx->header);
		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;

	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:
		free(o->internal);
		o->internal = NULL;
		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;
	char *outbuf, *c;

	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 = calloc(1, outsize)))
		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);
		free(ctx->header);
		ctx->header = NULL;
	}

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

		/* 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;
}

struct sr_output_format output_gnuplot = {
	"gnuplot",
	"Gnuplot",
	SR_DF_LOGIC,
	init,
	data,
	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 = calloc(1, sizeof(struct context))))
		return SR_ERR_MALLOC;

	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
		free(ctx);
		return SR_ERR_MALLOC;
	}

	o->internal = ctx;
	ctx->num_enabled_probes = 0;
	for (l = o->device->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->device->probes);
	comment[0] = '\0';
	if (o->device->plugin && sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
		samplerate = *((uint64_t *) o->device->plugin->get_device_info(
				o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
		if (!(frequency_s = sr_samplerate_string(samplerate))) {
			free(ctx->header);
			free(ctx);
			return SR_ERR;
		}
		snprintf(comment, 127, gnuplot_header_comment,
			ctx->num_enabled_probes, num_probes, frequency_s);
		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))) {
		free(ctx->header);
		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);
	free(frequency_s);

	if (b < 0) {
		free(ctx->header);
		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 = calloc(1, outsize)))
		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);
		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 = {
	"analog_gnuplot",
	"Gnuplot analog",
	SR_DF_ANALOG,
	analog_init,
	analog_data,
	event,
};
#endif
Commit	Line	Data
e2ad47b5 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 <stdlib.h>
	22	#include <string.h>
	23	#include <glib.h>
	24	#include <sigrok.h>
	25	#include "config.h"
	26
	27	struct context {
afc8e4de UH	28	unsigned int num_enabled_probes;
afc8e4de UH	29	unsigned int unitsize;
9688b443	30	char *probelist[SR_MAX_NUM_PROBES + 1];
e2ad47b5 UH	31	char *header;
	32	};
	33
9688b443 UH	34	#define MAX_HEADER_LEN \
	35	(1024 + (SR_MAX_NUM_PROBES * (SR_MAX_PROBENAME_LEN + 10)))
	36
d078d2e5	37	static const char *gnuplot_header = "\
e2ad47b5 UH	38	# Sample data in space-separated columns format usable by gnuplot\n\
e2ad47b5 UH	39	#\n\
5cca9adb	40	# Generated by: %s on %s%s\
d4ae8eaa	41	# Period: %s\n\
114fb93f UH	42	#\n\
	43	# Column\tProbe\n\
	44	# -------------------------------------\
	45	----------------------------------------\n\
	46	# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";
e2ad47b5	47
d078d2e5	48	static const char *gnuplot_header_comment = "\
7aae7462 BV	49	# Comment: Acquisition with %d/%d probes at %s\n";
7aae7462 BV	50
f50f3f40	51	static int init(struct sr_output *o)
e2ad47b5	52	{
e2ad47b5	53	struct context *ctx;
1afe8989	54	struct sr_probe *probe;
e2ad47b5 UH	55	GSList *l;
e2ad47b5 UH	56	uint64_t samplerate;
afc8e4de UH	57	unsigned int i;
afc8e4de UH	58	int b, num_probes;
d4ae8eaa	59	char c, frequency_s;
7aae7462	60	char wbuf[1000], comment[128];
5cca9adb	61	time_t t;
e2ad47b5	62
a821069b	63	if (!(ctx = calloc(1, sizeof(struct context))))
e46b8fb1	64	return SR_ERR_MALLOC;
a821069b	65
d4ae8eaa BV	66	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
d4ae8eaa BV	67	free(ctx);
e46b8fb1	68	return SR_ERR_MALLOC;
d4ae8eaa BV	69	}
d4ae8eaa BV	70
e2ad47b5 UH	71	o->internal = ctx;
	72	ctx->num_enabled_probes = 0;
	73	for (l = o->device->probes; l; l = l->next) {
	74	probe = l->data;
757b8c62 UH	75	if (!probe->enabled)
	76	continue;
	77	ctx->probelist[ctx->num_enabled_probes++] = probe->name;
e2ad47b5	78	}
e2ad47b5 UH	79	ctx->probelist[ctx->num_enabled_probes] = 0;
	80	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
	81
e2ad47b5	82	num_probes = g_slist_length(o->device->probes);
a821069b	83	comment[0] = '\0';
2bf4aca6	84	if (o->device->plugin && sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
7aae7462	85	samplerate = ((uint64_t ) o->device->plugin->get_device_info(
5a2326a7	86	o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
a00ba012	87	if (!(frequency_s = sr_samplerate_string(samplerate))) {
a821069b UH	88	free(ctx->header);
a821069b UH	89	free(ctx);
e46b8fb1	90	return SR_ERR;
a821069b UH	91	}
a821069b UH	92	snprintf(comment, 127, gnuplot_header_comment,
d4ae8eaa BV	93	ctx->num_enabled_probes, num_probes, frequency_s);
d4ae8eaa BV	94	free(frequency_s);
7aae7462	95	}
e2ad47b5 UH	96
	97	/* Columns / channels */
	98	wbuf[0] = '\0';
	99	for (i = 0; i < ctx->num_enabled_probes; i++) {
	100	c = (char )&wbuf + strlen((char )&wbuf);
114fb93f	101	sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
e2ad47b5 UH	102	}
e2ad47b5 UH	103
a00ba012	104	if (!(frequency_s = sr_period_string(samplerate))) {
d4ae8eaa BV	105	free(ctx->header);
d4ae8eaa BV	106	free(ctx);
e46b8fb1	107	return SR_ERR;
d4ae8eaa	108	}
5cca9adb	109	t = time(NULL);
e2ad47b5	110	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
d4ae8eaa	111	PACKAGE_STRING, ctime(&t), comment, frequency_s,
5cca9adb	112	(char *)&wbuf);
d4ae8eaa	113	free(frequency_s);
e2ad47b5	114
d4ae8eaa BV	115	if (b < 0) {
	116	free(ctx->header);
	117	free(ctx);
e46b8fb1	118	return SR_ERR;
d4ae8eaa	119	}
e2ad47b5 UH	120
	121	return 0;
	122	}
	123
f50f3f40	124	static int event(struct sr_output o, int event_type, char *data_out,
e2ad47b5 UH	125	uint64_t *length_out)
	126	{
	127	struct context *ctx;
e2ad47b5 UH	128
e2ad47b5 UH	129	ctx = o->internal;
99c1fc59	130	switch (event_type) {
5a2326a7	131	case SR_DF_TRIGGER:
9ab95e54	132	/* TODO: can a trigger mark be in a gnuplot data file? */
e2ad47b5	133	break;
5a2326a7	134	case SR_DF_END:
e2ad47b5 UH	135	free(o->internal);
	136	o->internal = NULL;
	137	break;
	138	}
	139
9ab95e54 BV	140	*data_out = NULL;
	141	*length_out = 0;
	142
e46b8fb1	143	return SR_OK;
e2ad47b5 UH	144	}
e2ad47b5 UH	145
54ac5277	146	static int data(struct sr_output o, const char data_in, uint64_t length_in,
e2ad47b5 UH	147	char *data_out, uint64_t length_out)
	148	{
	149	struct context *ctx;
d4ae8eaa	150	unsigned int max_linelen, outsize, p, curbit, i;
086eac7c UH	151	uint64_t sample;
086eac7c UH	152	static uint64_t samplecount = 0;
e2ad47b5 UH	153	char outbuf, c;
	154
	155	ctx = o->internal;
d4ae8eaa BV	156	max_linelen = 16 + ctx->num_enabled_probes * 2;
d4ae8eaa BV	157	outsize = length_in / ctx->unitsize * max_linelen;
e273a904	158	if (ctx->header)
d4ae8eaa	159	outsize += strlen(ctx->header);
a821069b	160
d4ae8eaa	161	if (!(outbuf = calloc(1, outsize)))
e46b8fb1	162	return SR_ERR_MALLOC;
a821069b UH	163
a821069b UH	164	outbuf[0] = '\0';
e2ad47b5 UH	165	if (ctx->header) {
	166	/* The header is still here, this must be the first packet. */
	167	strncpy(outbuf, ctx->header, outsize);
	168	free(ctx->header);
	169	ctx->header = NULL;
e2ad47b5 UH	170	}
e2ad47b5 UH	171
607b58de UH	172	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
607b58de UH	173	memcpy(&sample, data_in + i, ctx->unitsize);
e2ad47b5 UH	174
	175	/* The first column is a counter (needed for gnuplot). */
	176	c = outbuf + strlen(outbuf);
d4ae8eaa	177	sprintf(c, "%" PRIu64 "\t", samplecount++);
e2ad47b5 UH	178
	179	/* The next columns are the values of all channels. */
	180	for (p = 0; p < ctx->num_enabled_probes; p++) {
fbe2f794	181	curbit = (sample & ((uint64_t) (1 << p))) >> p;
e2ad47b5 UH	182	c = outbuf + strlen(outbuf);
	183	sprintf(c, "%d ", curbit);
	184	}
	185
	186	c = outbuf + strlen(outbuf);
	187	sprintf(c, "\n");
e2ad47b5 UH	188	}
	189
	190	*data_out = outbuf;
	191	*length_out = strlen(outbuf);
	192
e46b8fb1	193	return SR_OK;
e2ad47b5 UH	194	}
e2ad47b5 UH	195
77b45442 UH	196	struct sr_output_format output_gnuplot = {
	197	"gnuplot",
	198	"Gnuplot",
	199	SR_DF_LOGIC,
	200	init,
	201	data,
	202	event,
	203	};
	204
	205	/* Temporarily disabled. */
	206	#if 0
f50f3f40	207	static int analog_init(struct sr_output *o)
81bbdf6a DR	208	{
81bbdf6a DR	209	struct context *ctx;
1afe8989	210	struct sr_probe *probe;
81bbdf6a DR	211	GSList *l;
	212	uint64_t samplerate;
	213	unsigned int i;
	214	int b, num_probes;
	215	char c, frequency_s;
	216	char wbuf[1000], comment[128];
	217	time_t t;
	218
	219	if (!(ctx = calloc(1, sizeof(struct context))))
e46b8fb1	220	return SR_ERR_MALLOC;
81bbdf6a DR	221
	222	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
	223	free(ctx);
e46b8fb1	224	return SR_ERR_MALLOC;
81bbdf6a DR	225	}
	226
	227	o->internal = ctx;
	228	ctx->num_enabled_probes = 0;
	229	for (l = o->device->probes; l; l = l->next) {
	230	probe = l->data;
	231	if (!probe->enabled)
	232	continue;
	233	ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	234	}
	235	ctx->probelist[ctx->num_enabled_probes] = 0;
	236	// ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
809c5f20 UH	237	ctx->unitsize = sizeof(struct sr_analog_sample) +
809c5f20 UH	238	(ctx->num_enabled_probes * sizeof(struct sr_analog_probe));
81bbdf6a DR	239
	240	num_probes = g_slist_length(o->device->probes);
	241	comment[0] = '\0';
2bf4aca6	242	if (o->device->plugin && sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
81bbdf6a	243	samplerate = ((uint64_t ) o->device->plugin->get_device_info(
5a2326a7	244	o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
a00ba012	245	if (!(frequency_s = sr_samplerate_string(samplerate))) {
81bbdf6a DR	246	free(ctx->header);
81bbdf6a DR	247	free(ctx);
e46b8fb1	248	return SR_ERR;
81bbdf6a DR	249	}
	250	snprintf(comment, 127, gnuplot_header_comment,
	251	ctx->num_enabled_probes, num_probes, frequency_s);
	252	free(frequency_s);
	253	}
	254
	255	/* Columns / channels */
	256	wbuf[0] = '\0';
	257	for (i = 0; i < ctx->num_enabled_probes; i++) {
	258	c = (char )&wbuf + strlen((char )&wbuf);
	259	sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	260	}
	261
a00ba012	262	if (!(frequency_s = sr_period_string(samplerate))) {
81bbdf6a DR	263	free(ctx->header);
81bbdf6a DR	264	free(ctx);
e46b8fb1	265	return SR_ERR;
81bbdf6a DR	266	}
	267	t = time(NULL);
	268	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
	269	PACKAGE_STRING, ctime(&t), comment, frequency_s,
	270	(char *)&wbuf);
	271	free(frequency_s);
	272
	273	if (b < 0) {
	274	free(ctx->header);
	275	free(ctx);
e46b8fb1	276	return SR_ERR;
81bbdf6a DR	277	}
	278
	279	return 0;
	280	}
	281
f50f3f40	282	static int analog_data(struct sr_output o, char data_in, uint64_t length_in,
81bbdf6a DR	283	char *data_out, uint64_t length_out)
	284	{
	285	struct context *ctx;
ff35879b	286	unsigned int max_linelen, outsize, p, /* curbit, */ i;
81bbdf6a DR	287	// uint64_t sample;
	288	static uint64_t samplecount = 0;
	289	char outbuf, c;
809c5f20	290	struct sr_analog_sample *sample;
81bbdf6a DR	291
	292	ctx = o->internal;
	293	// max_linelen = 16 + ctx->num_enabled_probes * 2;
	294	max_linelen = 16 + ctx->num_enabled_probes * 30;
	295	outsize = length_in / ctx->unitsize * max_linelen;
	296	if (ctx->header)
	297	outsize += strlen(ctx->header);
	298
	299	if (!(outbuf = calloc(1, outsize)))
e46b8fb1	300	return SR_ERR_MALLOC;
81bbdf6a DR	301
	302	outbuf[0] = '\0';
	303	if (ctx->header) {
	304	/* The header is still here, this must be the first packet. */
	305	strncpy(outbuf, ctx->header, outsize);
	306	free(ctx->header);
	307	ctx->header = NULL;
	308	}
	309
	310	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
	311	// memcpy(&sample, data_in + i, ctx->unitsize);
809c5f20	312	sample = (struct sr_analog_sample *) (data_in + i);
81bbdf6a DR	313
	314	/* The first column is a counter (needed for gnuplot). */
	315	c = outbuf + strlen(outbuf);
	316	sprintf(c, "%" PRIu64 "\t", samplecount++);
	317
	318	/* The next columns are the values of all channels. */
	319	for (p = 0; p < ctx->num_enabled_probes; p++) {
	320	// curbit = (sample & ((uint64_t) (1 << p))) >> p;
	321	c = outbuf + strlen(outbuf);
	322	// sprintf(c, "%d ", curbit);
	323	/*
	324	* FIXME: Should be doing proper raw->voltage conversion
	325	* here, casting to int16_t isn't it. Remember that if
	326	* res = 1 conversion isn't necessary.
	327	*/
	328	sprintf(c, "%f ", (double) ((int16_t) (sample->probes[p].val &
	329	((1 << sample->probes[p].res) - 1))));
	330	}
	331
	332	c = outbuf + strlen(outbuf);
	333	sprintf(c, "\n");
	334	}
	335
	336	*data_out = outbuf;
	337	*length_out = strlen(outbuf);
	338
e46b8fb1	339	return SR_OK;
81bbdf6a DR	340	}
81bbdf6a DR	341
f50f3f40	342	struct sr_output_format output_analog_gnuplot = {
81bbdf6a DR	343	"analog_gnuplot",
81bbdf6a DR	344	"Gnuplot analog",
5a2326a7	345	SR_DF_ANALOG,
81bbdf6a DR	346	analog_init,
	347	analog_data,
	348	event,
	349	};
77b45442	350	#endif