cli: removed obsolete debugging, setup for proper stderr logging

[sigrok-cli.git] / sigrok-cli.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <sigrok.h>
#include "sigrok-cli.h"
#include "config.h"

#define DEFAULT_OUTPUT_FORMAT "bits:width=64"

extern struct sr_hwcap_option sr_hwcap_options[];

static uint64_t limit_samples = 0;
static struct sr_output_format *output_format = NULL;
static int default_output_format = FALSE;
static char *output_format_param = NULL;
static char *input_format_param = NULL;
static GData *pd_ann_visible = NULL;

static gboolean opt_version = FALSE;
static gint opt_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */
static gboolean opt_list_devs = FALSE;
static gboolean opt_wait_trigger = FALSE;
static gchar *opt_input_file = NULL;
static gchar *opt_output_file = NULL;
static gchar *opt_dev = NULL;
static gchar *opt_probes = NULL;
static gchar *opt_triggers = NULL;
static gchar *opt_pds = NULL;
static gchar *opt_pd_stack = NULL;
static gchar *opt_input_format = NULL;
static gchar *opt_output_format = NULL;
static gchar *opt_time = NULL;
static gchar *opt_samples = NULL;
static gchar *opt_continuous = NULL;

static GOptionEntry optargs[] = {
	{"version", 'V', 0, G_OPTION_ARG_NONE, &opt_version, "Show version and support list", NULL},
	{"loglevel", 'l', 0, G_OPTION_ARG_INT, &opt_loglevel, "Select libsigrok/libsigrokdecode loglevel", NULL},
	{"list-devices", 'D', 0, G_OPTION_ARG_NONE, &opt_list_devs, "Scan for devices", NULL},
	{"device", 'd', 0, G_OPTION_ARG_STRING, &opt_dev, "Use specified device", NULL},
	{"input-file", 'i', 0, G_OPTION_ARG_FILENAME, &opt_input_file, "Load input from file", NULL},
	{"input-format", 'I', 0, G_OPTION_ARG_STRING, &opt_input_format, "Input format", NULL},
	{"output-file", 'o', 0, G_OPTION_ARG_FILENAME, &opt_output_file, "Save output to file", NULL},
	{"output-format", 'O', 0, G_OPTION_ARG_STRING, &opt_output_format, "Output format", NULL},
	{"probes", 'p', 0, G_OPTION_ARG_STRING, &opt_probes, "Probes to use", NULL},
	{"triggers", 't', 0, G_OPTION_ARG_STRING, &opt_triggers, "Trigger configuration", NULL},
	{"wait-trigger", 'w', 0, G_OPTION_ARG_NONE, &opt_wait_trigger, "Wait for trigger", NULL},
	{"protocol-decoders", 'a', 0, G_OPTION_ARG_STRING, &opt_pds, "Protocol decoders to run", NULL},
	{"protocol-decoder-stack", 's', 0, G_OPTION_ARG_STRING, &opt_pd_stack, "Protocol decoder stack", NULL},
	{"time", 0, 0, G_OPTION_ARG_STRING, &opt_time, "How long to sample (ms)", NULL},
	{"samples", 0, 0, G_OPTION_ARG_STRING, &opt_samples, "Number of samples to acquire", NULL},
	{"continuous", 0, 0, G_OPTION_ARG_NONE, &opt_continuous, "Sample continuously", NULL},
	{NULL, 0, 0, 0, NULL, NULL, NULL}
};

static void show_version(void)
{
	GSList *l;
	struct sr_dev_driver **drivers;
	struct sr_input_format **inputs;
	struct sr_output_format **outputs;
	struct srd_decoder *dec;
	int i;

	printf("sigrok-cli %s\n\n", VERSION);

	printf("Using libsigrok %s (lib version %s).\n",
	       sr_package_version_string_get(), sr_lib_version_string_get());
	printf("Using libsigrokdecode %s (lib version %s).\n\n",
	       srd_package_version_string_get(), srd_lib_version_string_get());

	printf("Supported hardware drivers:\n");
	drivers = sr_driver_list();
	for (i = 0; drivers[i]; i++) {
		printf("  %-20s %s\n", drivers[i]->name, drivers[i]->longname);
	}
	printf("\n");

	printf("Supported input formats:\n");
	inputs = sr_input_list();
	for (i = 0; inputs[i]; i++)
		printf("  %-20s %s\n", inputs[i]->id, inputs[i]->description);
	printf("\n");

	printf("Supported output formats:\n");
	outputs = sr_output_list();
	for (i = 0; outputs[i]; i++)
		printf("  %-20s %s\n", outputs[i]->id, outputs[i]->description);
	printf("\n");

	if (srd_init(NULL) == SRD_OK) {
		printf("Supported protocol decoders:\n");
		srd_decoder_load_all();
		for (l = srd_decoder_list(); l; l = l->next) {
			dec = l->data;
			printf("  %-20s %s\n", dec->id, dec->longname);
			/* Print protocol description upon "-l 3" or higher. */
			if (opt_loglevel >= SR_LOG_INFO)
				printf("  %-20s %s\n", "", dec->desc);
		}
		srd_exit();
	}
	printf("\n");
}

static void print_dev_line(const struct sr_dev *dev)
{
	const struct sr_dev_inst *sdi;

	sr_dev_info_get(dev, SR_DI_INST, (const void **)&sdi);

	if (sdi->vendor && sdi->vendor[0])
		printf("%s ", sdi->vendor);
	if (sdi->model && sdi->model[0])
		printf("%s ", sdi->model);
	if (sdi->version && sdi->version[0])
		printf("%s ", sdi->version);
	if (dev->probes)
		printf("with %d probes", g_slist_length(dev->probes));
	printf("\n");
}

static void show_dev_list(void)
{
	struct sr_dev *dev, *demo_dev;
	GSList *devs, *l;
	int devcnt;

	devcnt = 0;
	devs = sr_dev_list();

	if (g_slist_length(devs) == 0)
		return;

	printf("The following devices were found:\nID    Device\n");
	demo_dev = NULL;
	for (l = devs; l; l = l->next) {
		dev = l->data;
		if (sr_dev_has_hwcap(dev, SR_HWCAP_DEMO_DEV)) {
			demo_dev = dev;
			continue;
		}
		printf("%-3d   ", devcnt++);
		print_dev_line(dev);
	}
	if (demo_dev) {
		printf("demo  ");
		print_dev_line(demo_dev);
	}
}

static void show_dev_detail(void)
{
	struct sr_dev *dev;
	struct sr_hwcap_option *hwo;
	const struct sr_samplerates *samplerates;
	int cap, *hwcaps, i;
	char *s, *title;
	const char *charopts, **stropts;

	dev = parse_devstring(opt_dev);
	if (!dev) {
		printf("No such device. Use -D to list all devices.\n");
		return;
	}

	print_dev_line(dev);

	if (sr_dev_info_get(dev, SR_DI_TRIGGER_TYPES,
					(const void **)&charopts) == SR_OK) {
		printf("Supported triggers: ");
		while (*charopts) {
			printf("%c ", *charopts);
			charopts++;
		}
		printf("\n");
	}

	title = "Supported options:\n";
	hwcaps = dev->driver->hwcap_get_all();
	for (cap = 0; hwcaps[cap]; cap++) {
		if (!(hwo = sr_hw_hwcap_get(hwcaps[cap])))
			continue;

		if (title) {
			printf("%s", title);
			title = NULL;
		}

		if (hwo->hwcap == SR_HWCAP_PATTERN_MODE) {
			printf("    %s", hwo->shortname);
			if (sr_dev_info_get(dev, SR_DI_PATTERNS,
					(const void **)&stropts) == SR_OK) {
				printf(" - supported patterns:\n");
				for (i = 0; stropts[i]; i++)
					printf("      %s\n", stropts[i]);
			} else {
				printf("\n");
			}
		} else if (hwo->hwcap == SR_HWCAP_SAMPLERATE) {
			printf("    %s", hwo->shortname);
			/* Supported samplerates */
			if (sr_dev_info_get(dev, SR_DI_SAMPLERATES,
					(const void **)&samplerates) != SR_OK) {
				printf("\n");
				continue;
			}

			if (samplerates->step) {
				/* low */
				if (!(s = sr_samplerate_string(samplerates->low)))
					continue;
				printf(" (%s", s);
				g_free(s);
				/* high */
				if (!(s = sr_samplerate_string(samplerates->high)))
					continue;
				printf(" - %s", s);
				g_free(s);
				/* step */
				if (!(s = sr_samplerate_string(samplerates->step)))
					continue;
				printf(" in steps of %s)\n", s);
				g_free(s);
			} else {
				printf(" - supported samplerates:\n");
				for (i = 0; samplerates->list[i]; i++) {
					printf("      %s\n", sr_samplerate_string(samplerates->list[i]));
				}
			}
		} else {
			printf("    %s\n", hwo->shortname);
		}
	}
}

static void show_pd_detail(void)
{
	GSList *l;
	struct srd_decoder *dec;
	char **pdtokens, **pdtok, **ann, *doc;
	struct srd_probe *p;

	pdtokens = g_strsplit(opt_pds, ",", -1);
	for (pdtok = pdtokens; *pdtok; pdtok++) {
		if (!(dec = srd_decoder_get_by_id(*pdtok))) {
			printf("Protocol decoder %s not found.", *pdtok);
			return;
		}
		printf("ID: %s\nName: %s\nLong name: %s\nDescription: %s\n",
				dec->id, dec->name, dec->longname, dec->desc);
		printf("License: %s\n", dec->license);
		printf("Annotations:\n");
		if (dec->annotations) {
			for (l = dec->annotations; l; l = l->next) {
				ann = l->data;
				printf("- %s\n  %s\n", ann[0], ann[1]);
			}
		} else {
			printf("None.\n");
		}
		/* TODO: Print supported decoder options. */
		printf("Required probes:\n");
		if (dec->probes) {
			for (l = dec->probes; l; l = l->next) {
				p = l->data;
				printf("- %s (%s): %s\n",
				       p->name, p->id, p->desc);
			}
		} else {
			printf("None.\n");
		}
		printf("Optional probes:\n");
		if (dec->opt_probes) {
			for (l = dec->opt_probes; l; l = l->next) {
				p = l->data;
				printf("- %s (%s): %s\n",
				       p->name, p->id, p->desc);
			}
		} else {
			printf("None.\n");
		}
		if ((doc = srd_decoder_doc_get(dec))) {
			printf("Documentation:\n%s\n",
			       doc[0] == '\n' ? doc + 1 : doc);
			g_free(doc);
		}
	}

	g_strfreev(pdtokens);
}

static void datafeed_in(struct sr_dev *dev, struct sr_datafeed_packet *packet)
{
	static struct sr_output *o = NULL;
	static int probelist[SR_MAX_NUM_PROBES + 1] = { 0 };
	static uint64_t received_samples = 0;
	static int unitsize = 0;
	static int triggered = 0;
	static FILE *outfile = NULL;
	struct sr_probe *probe;
	struct sr_datafeed_header *header;
	struct sr_datafeed_logic *logic;
	int num_enabled_probes, sample_size, ret, i;
	uint64_t output_len, filter_out_len;
	uint8_t *output_buf, *filter_out;

	/* If the first packet to come in isn't a header, don't even try. */
	if (packet->type != SR_DF_HEADER && o == NULL)
		return;

	sample_size = -1;
	switch (packet->type) {
	case SR_DF_HEADER:
		g_message("cli: Received SR_DF_HEADER");
		/* Initialize the output module. */
		if (!(o = g_try_malloc(sizeof(struct sr_output)))) {
			printf("Output module malloc failed.\n");
			exit(1);
		}
		o->format = output_format;
		o->dev = dev;
		o->param = output_format_param;
		if (o->format->init) {
			if (o->format->init(o) != SR_OK) {
				printf("Output format initialization failed.\n");
				exit(1);
			}
		}

		header = packet->payload;
		num_enabled_probes = 0;
		for (i = 0; i < header->num_logic_probes; i++) {
			probe = g_slist_nth_data(dev->probes, i);
			if (probe->enabled)
				probelist[num_enabled_probes++] = probe->index;
		}
		/* How many bytes we need to store num_enabled_probes bits */
		unitsize = (num_enabled_probes + 7) / 8;

		outfile = stdout;
		if (opt_output_file) {
			if (default_output_format) {
				/* output file is in session format, which means we'll
				 * dump everything in the datastore as it comes in,
				 * and save from there after the session. */
				outfile = NULL;
				ret = sr_datastore_new(unitsize, &(dev->datastore));
				if (ret != SR_OK) {
					printf("Failed to create datastore.\n");
					exit(1);
				}
			} else {
				/* saving to a file in whatever format was set
				 * with -O, so all we need is a filehandle */
				outfile = g_fopen(opt_output_file, "wb");
			}
		}
		if (opt_pds)
			srd_session_start(num_enabled_probes, unitsize,
					header->samplerate);
		break;
	case SR_DF_END:
		g_message("cli: Received SR_DF_END");
		if (!o) {
			g_message("cli: double end!");
			break;
		}
		if (o->format->event) {
			o->format->event(o, SR_DF_END, &output_buf, &output_len);
			if (output_len) {
				if (outfile)
					fwrite(output_buf, 1, output_len, outfile);
				g_free(output_buf);
				output_len = 0;
			}
		}
		if (limit_samples && received_samples < limit_samples)
			printf("Device only sent %" PRIu64 " samples.\n",
			       received_samples);
		if (opt_continuous)
			printf("Device stopped after %" PRIu64 " samples.\n",
			       received_samples);
		sr_session_halt();
		if (outfile && outfile != stdout)
			fclose(outfile);
		g_free(o);
		o = NULL;
		break;
	case SR_DF_TRIGGER:
		g_message("cli: received SR_DF_TRIGGER");
		if (o->format->event)
			o->format->event(o, SR_DF_TRIGGER, &output_buf,
					 &output_len);
		triggered = 1;
		break;
	case SR_DF_LOGIC:
		logic = packet->payload;
		sample_size = logic->unitsize;
		g_message("cli: received SR_DF_LOGIC, %"PRIu64" bytes", logic->length);
		break;
	}

	/* not supporting anything but SR_DF_LOGIC for now */

	if (sample_size == -1 || logic->length == 0)
		return;

	/* Don't store any samples until triggered. */
	if (opt_wait_trigger && !triggered)
		return;

	if (limit_samples && received_samples >= limit_samples)
		return;

	/* TODO: filters only support SR_DF_LOGIC */
	ret = sr_filter_probes(sample_size, unitsize, probelist,
				   logic->data, logic->length,
				   &filter_out, &filter_out_len);
	if (ret != SR_OK)
		return;

	/* what comes out of the filter is guaranteed to be packed into the
	 * minimum size needed to support the number of samples at this sample
	 * size. however, the driver may have submitted too much -- cut off
	 * the buffer of the last packet according to the sample limit.
	 */
	if (limit_samples && (received_samples + logic->length / sample_size >
			limit_samples * sample_size))
		filter_out_len = limit_samples * sample_size - received_samples;

	if (dev->datastore)
		sr_datastore_put(dev->datastore, filter_out,
				 filter_out_len, sample_size, probelist);

	if (opt_output_file && default_output_format)
		/* saving to a session file, don't need to do anything else
		 * to this data for now. */
		goto cleanup;

	if (opt_pds) {
		if (srd_session_send(received_samples, (uint8_t*)filter_out,
				filter_out_len) != SRD_OK)
			sr_session_halt();
	} else {
		output_len = 0;
		if (o->format->data && packet->type == o->format->df_type)
			o->format->data(o, filter_out, filter_out_len, &output_buf, &output_len);
		if (output_len) {
			fwrite(output_buf, 1, output_len, outfile);
			g_free(output_buf);
		}
	}

cleanup:
	g_free(filter_out);
	received_samples += logic->length / sample_size;
}

/* Register the given PDs for this session.
 * Accepts a string of the form: "spi:sck=3:sdata=4,spi:sck=3:sdata=5"
 * That will instantiate two SPI decoders on the clock but different data
 * lines.
 */
static int register_pds(struct sr_dev *dev, const char *pdstring)
{
	GHashTable *pd_opthash;
	struct srd_decoder_inst *di;
	char **pdtokens, **pdtok, *pd_name;

	/* Avoid compiler warnings. */
	(void)dev;

	g_datalist_init(&pd_ann_visible);
	pdtokens = g_strsplit(pdstring, ",", -1);
	pd_opthash = NULL;
	pd_name = NULL;

	for (pdtok = pdtokens; *pdtok; pdtok++) {
		if (!(pd_opthash = parse_generic_arg(*pdtok))) {
			fprintf(stderr, "Invalid protocol decoder option '%s'.\n", *pdtok);
			goto err_out;
		}

		pd_name = g_strdup(g_hash_table_lookup(pd_opthash, "sigrok_key"));
		g_hash_table_remove(pd_opthash, "sigrok_key");
		if (srd_decoder_load(pd_name) != SRD_OK) {
			fprintf(stderr, "Failed to load protocol decoder %s\n", pd_name);
			goto err_out;
		}
		if (!(di = srd_inst_new(pd_name, pd_opthash))) {
			fprintf(stderr, "Failed to instantiate protocol decoder %s\n", pd_name);
			goto err_out;
		}
		g_datalist_set_data(&pd_ann_visible, di->inst_id, pd_name);

		/* Any keys left in the options hash are probes, where the key
		 * is the probe name as specified in the decoder class, and the
		 * value is the probe number i.e. the order in which the PD's
		 * incoming samples are arranged. */
		if (srd_inst_probe_set_all(di, pd_opthash) != SRD_OK)
			goto err_out;
		g_hash_table_destroy(pd_opthash);
		pd_opthash = NULL;
	}

err_out:
	g_strfreev(pdtokens);
	if (pd_opthash)
		g_hash_table_destroy(pd_opthash);
	if (pd_name)
		g_free(pd_name);

	return 0;
}

void show_pd_annotation(struct srd_proto_data *pdata, void *cb_data)
{
	int i;
	char **annotations;

	/* 'cb_data' is not used in this specific callback. */
	(void)cb_data;

	if (pdata->ann_format != 0) {
		/* CLI only shows the default annotation format. */
		return;
	}

	if (!g_datalist_get_data(&pd_ann_visible, pdata->pdo->di->inst_id)) {
		/* Not in the list of PDs whose annotations we're showing. */
		return;
	}

	annotations = pdata->data;
	if (opt_loglevel > SR_LOG_WARN)
		printf("%"PRIu64"-%"PRIu64" ", pdata->start_sample, pdata->end_sample);
	printf("%s: ", pdata->pdo->proto_id);
	for (i = 0; annotations[i]; i++)
		printf("\"%s\" ", annotations[i]);
	printf("\n");
}

static int select_probes(struct sr_dev *dev)
{
	struct sr_probe *probe;
	char **probelist;
	int max_probes, i;

	if (!opt_probes)
		return SR_OK;

	/*
	 * This only works because a device by default initializes
	 * and enables all its probes.
	 */
	max_probes = g_slist_length(dev->probes);
	probelist = parse_probestring(max_probes, opt_probes);
	if (!probelist) {
		return SR_ERR;
	}

	for (i = 0; i < max_probes; i++) {
		if (probelist[i]) {
			sr_dev_probe_name_set(dev, i + 1, probelist[i]);
			g_free(probelist[i]);
		} else {
			probe = sr_dev_probe_find(dev, i + 1);
			probe->enabled = FALSE;
		}
	}
	g_free(probelist);

	return SR_OK;
}

/**
 * Return the input file format which the CLI tool should use.
 *
 * If the user specified -I / --input-format, use that one. Otherwise, try to
 * autodetect the format as good as possible. Failing that, return NULL.
 *
 * @param filename The filename of the input file. Must not be NULL.
 * @param opt The -I / --input-file option the user specified (or NULL).
 *
 * @return A pointer to the 'struct sr_input_format' that should be used,
 *         or NULL if no input format was selected or auto-detected.
 */
static struct sr_input_format *determine_input_file_format(
			const char *filename, const char *opt)
{
	int i;
	struct sr_input_format **inputs;

	/* If there are no input formats, return NULL right away. */
	inputs = sr_input_list();
	if (!inputs) {
		fprintf(stderr, "cli: %s: no supported input formats "
			"available", __func__);
		return NULL;
	}

	/* If the user specified -I / --input-format, use that one. */
	if (opt) {
		for (i = 0; inputs[i]; i++) {
			if (strcasecmp(inputs[i]->id, opt_input_format))
				continue;
			printf("Using user-specified input file format"
			       " '%s'.\n", inputs[i]->id);
			return inputs[i];
		}

		/* The user specified an unknown input format, return NULL. */
		fprintf(stderr, "Error: Specified input file format '%s' is "
			"unknown.\n", opt_input_format);
		return NULL;
	}

	/* Otherwise, try to find an input module that can handle this file. */
	for (i = 0; inputs[i]; i++) {
		if (inputs[i]->format_match(filename))
			break;
	}

	/* Return NULL if no input module wanted to touch this. */
	if (!inputs[i]) {
		fprintf(stderr, "Error: No matching input module found.\n");
		return NULL;
	}
		
	printf("Using input file format '%s'.\n", inputs[i]->id);
	return inputs[i];
}

static void load_input_file_format(void)
{
	struct stat st;
	struct sr_input *in;
	struct sr_input_format *input_format;

	input_format = determine_input_file_format(opt_input_file,
						   opt_input_format);
	if (!input_format) {
		fprintf(stderr, "Error: Couldn't detect input file format.\n");
		return;
	}

	if (stat(opt_input_file, &st) == -1) {
		printf("Failed to load %s: %s\n", opt_input_file,
			strerror(errno));
		exit(1);
	}

	/* Initialize the input module. */
	if (!(in = g_try_malloc(sizeof(struct sr_input)))) {
		printf("Failed to allocate input module.\n");
		exit(1);
	}
	in->format = input_format;
	in->param = input_format_param;
	if (in->format->init) {
		if (in->format->init(in) != SR_OK) {
			printf("Input format init failed.\n");
			exit(1);
		}
	}

	if (select_probes(in->vdev) > 0)
            return;

	sr_session_new();
	sr_session_datafeed_callback_add(datafeed_in);
	if (sr_session_dev_add(in->vdev) != SR_OK) {
		printf("Failed to use device.\n");
		sr_session_destroy();
		return;
	}

	input_format->loadfile(in, opt_input_file);
	if (opt_output_file && default_output_format) {
		if (sr_session_save(opt_output_file) != SR_OK)
			printf("Failed to save session.\n");
	}
	sr_session_destroy();
}

static void load_input_file(void)
{

	if (sr_session_load(opt_input_file) == SR_OK) {
		/* sigrok session file */
		sr_session_datafeed_callback_add(datafeed_in);
		sr_session_start();
		sr_session_run();
		sr_session_stop();
	}
	else {
		/* fall back on input modules */
		load_input_file_format();
	}
}

int num_real_devs(void)
{
	struct sr_dev *dev;
	GSList *devs, *l;
	int num_devs;

	num_devs = 0;
	devs = sr_dev_list();
	for (l = devs; l; l = l->next) {
		dev = l->data;
		if (!sr_dev_has_hwcap(dev, SR_HWCAP_DEMO_DEV))
			num_devs++;
	}

	return num_devs;
}

static int set_dev_options(struct sr_dev *dev, GHashTable *args)
{
	GHashTableIter iter;
	gpointer key, value;
	int ret, i;
	uint64_t tmp_u64;
	gboolean found;
	gboolean tmp_bool;

	g_hash_table_iter_init(&iter, args);
	while (g_hash_table_iter_next(&iter, &key, &value)) {
		found = FALSE;
		for (i = 0; sr_hwcap_options[i].hwcap; i++) {
			if (strcmp(sr_hwcap_options[i].shortname, key))
				continue;
			if ((value == NULL) && 
			    (sr_hwcap_options[i].type != SR_T_BOOL)) {
				printf("Option '%s' needs a value.\n", (char *)key);
				return SR_ERR;
			}
			found = TRUE;
			switch (sr_hwcap_options[i].type) {
			case SR_T_UINT64:
				ret = sr_parse_sizestring(value, &tmp_u64);
				if (ret != SR_OK)
					break;
				ret = dev->driver->dev_config_set(dev->driver_index,
					sr_hwcap_options[i].hwcap, &tmp_u64);
				break;
			case SR_T_CHAR:
				ret = dev->driver->dev_config_set(dev->driver_index,
					sr_hwcap_options[i].hwcap, value);
				break;
			case SR_T_BOOL:
				if (!value)
					tmp_bool = TRUE;
				else 
					tmp_bool = sr_parse_boolstring(value);
				ret = dev->driver->dev_config_set(dev->driver_index,
						sr_hwcap_options[i].hwcap, 
						GINT_TO_POINTER(tmp_bool));
				break;
			default:
				ret = SR_ERR;
			}

			if (ret != SR_OK) {
				printf("Failed to set device option '%s'.\n", (char *)key);
				return ret;
			}
			else
				break;
		}
		if (!found) {
			printf("Unknown device option '%s'.\n", (char *) key);
			return SR_ERR;
		}
	}

	return SR_OK;
}

static void run_session(void)
{
	struct sr_dev *dev;
	GHashTable *devargs;
	int num_devs, max_probes, i;
	uint64_t time_msec;
	char **probelist, *devspec;

	devargs = NULL;
	if (opt_dev) {
		devargs = parse_generic_arg(opt_dev);
		devspec = g_hash_table_lookup(devargs, "sigrok_key");
		dev = parse_devstring(devspec);
		if (!dev) {
			g_warning("Device not found.");
			return;
		}
		g_hash_table_remove(devargs, "sigrok_key");
	} else {
		num_devs = num_real_devs();
		if (num_devs == 1) {
			/* No device specified, but there is only one. */
			devargs = NULL;
			dev = parse_devstring("0");
		} else if (num_devs == 0) {
			printf("No devices found.\n");
			return;
		} else {
			printf("%d devices found, please select one.\n", num_devs);
			return;
		}
	}

	sr_session_new();
	sr_session_datafeed_callback_add(datafeed_in);

	if (sr_session_dev_add(dev) != SR_OK) {
		printf("Failed to use device.\n");
		sr_session_destroy();
		return;
	}

	if (devargs) {
		if (set_dev_options(dev, devargs) != SR_OK) {
			sr_session_destroy();
			return;
		}
		g_hash_table_destroy(devargs);
	}

	if (select_probes(dev) != SR_OK)
            return;

	if (opt_continuous) {
		if (!sr_driver_hwcap_exists(dev->driver, SR_HWCAP_CONTINUOUS)) {
			printf("This device does not support continuous sampling.");
			sr_session_destroy();
			return;
		}
	}

	if (opt_triggers) {
		probelist = sr_parse_triggerstring(dev, opt_triggers);
		if (!probelist) {
			sr_session_destroy();
			return;
		}

		max_probes = g_slist_length(dev->probes);
		for (i = 0; i < max_probes; i++) {
			if (probelist[i]) {
				sr_dev_trigger_set(dev, i + 1, probelist[i]);
				g_free(probelist[i]);
			}
		}
		g_free(probelist);
	}

	if (opt_time) {
		time_msec = sr_parse_timestring(opt_time);
		if (time_msec == 0) {
			printf("Invalid time '%s'\n", opt_time);
			sr_session_destroy();
			return;
		}

		if (sr_driver_hwcap_exists(dev->driver, SR_HWCAP_LIMIT_MSEC)) {
			if (dev->driver->dev_config_set(dev->driver_index,
			    SR_HWCAP_LIMIT_MSEC, &time_msec) != SR_OK) {
				printf("Failed to configure time limit.\n");
				sr_session_destroy();
				return;
			}
		}
		else {
			/* time limit set, but device doesn't support this...
			 * convert to samples based on the samplerate.
			 */
			limit_samples = 0;
			if (sr_dev_has_hwcap(dev, SR_HWCAP_SAMPLERATE)) {
				const uint64_t *samplerate;

				sr_dev_info_get(dev, SR_DI_CUR_SAMPLERATE,
						(const void **)&samplerate);
				limit_samples = (*samplerate) * time_msec / (uint64_t)1000;
			}
			if (limit_samples == 0) {
				printf("Not enough time at this samplerate.\n");
				sr_session_destroy();
				return;
			}

			if (dev->driver->dev_config_set(dev->driver_index,
			    SR_HWCAP_LIMIT_SAMPLES, &limit_samples) != SR_OK) {
				printf("Failed to configure time-based sample limit.\n");
				sr_session_destroy();
				return;
			}
		}
	}

	if (opt_samples) {
		if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)
			|| (dev->driver->dev_config_set(dev->driver_index,
			    SR_HWCAP_LIMIT_SAMPLES, &limit_samples) != SR_OK)) {
			printf("Failed to configure sample limit.\n");
			sr_session_destroy();
			return;
		}
	}

	if (dev->driver->dev_config_set(dev->driver_index,
		  SR_HWCAP_PROBECONFIG, (char *)dev->probes) != SR_OK) {
		printf("Failed to configure probes.\n");
		sr_session_destroy();
		return;
	}

	if (sr_session_start() != SR_OK) {
		printf("Failed to start session.\n");
		sr_session_destroy();
		return;
	}

	if (opt_continuous)
		add_anykey();

	sr_session_run();

	if (opt_continuous)
		clear_anykey();

	if (opt_output_file && default_output_format) {
		if (sr_session_save(opt_output_file) != SR_OK)
			printf("Failed to save session.\n");
	}
	sr_session_destroy();
}

static void logger(const gchar *log_domain, GLogLevelFlags log_level,
		   const gchar *message, gpointer cb_data)
{
	/* Avoid compiler warnings. */
	(void)log_domain;
	(void)cb_data;

	/*
	 * All messages, warnings, errors etc. go to stderr (not stdout) in
	 * order to not mess up the CLI tool data output, e.g. VCD output.
	 */
	if (log_level & (G_LOG_LEVEL_ERROR | G_LOG_LEVEL_WARNING)
			|| opt_loglevel > SR_LOG_WARN) {
		fprintf(stderr, "%s\n", message);
		fflush(stderr);
	}
}

int main(int argc, char **argv)
{
	GOptionContext *context;
	GError *error;
	GHashTable *fmtargs;
	GHashTableIter iter;
	gpointer key, value;
	struct sr_output_format **outputs;
	struct srd_decoder_inst *di_from, *di_to;
	int i, ret;
	char *fmtspec, **pds;

	g_log_set_default_handler(logger, NULL);

	error = NULL;
	context = g_option_context_new(NULL);
	g_option_context_add_main_entries(context, optargs, NULL);

	if (!g_option_context_parse(context, &argc, &argv, &error)) {
		g_warning("%s", error->message);
		return 1;
	}

	/* Set the loglevel (amount of messages to output) for libsigrok. */
	if (sr_log_loglevel_set(opt_loglevel) != SR_OK) {
		fprintf(stderr, "cli: %s: sr_log_loglevel_set(%d) failed\n",
			__func__, opt_loglevel);
		return 1;
	}

	/* Set the loglevel (amount of messages to output) for libsigrokdecode. */
	if (srd_log_loglevel_set(opt_loglevel) != SRD_OK) {
		fprintf(stderr, "cli: %s: srd_log_loglevel_set(%d) failed\n",
			__func__, opt_loglevel);
		return 1;
	}

	if (sr_init() != SR_OK)
		return 1;

	if (opt_pds) {
		if (srd_init(NULL) != SRD_OK) {
			printf("Failed to initialize sigrokdecode\n");
			return 1;
		}
		if (register_pds(NULL, opt_pds) != 0) {
			printf("Failed to register protocol decoders\n");
			return 1;
		}
		if (srd_pd_output_callback_add(SRD_OUTPUT_ANN,
				show_pd_annotation, NULL) != SRD_OK) {
			printf("Failed to register protocol decoder callback\n");
			return 1;
		}

		pds = g_strsplit(opt_pds, ",", 0);
		if (g_strv_length(pds) > 1) {
			if (opt_pd_stack) {
				/* A stack setup was specified, use that. */
				g_strfreev(pds);
				pds = g_strsplit(opt_pd_stack, ",", 0);
				if (g_strv_length(pds) < 2) {
					g_strfreev(pds);
					printf("Specify at least two protocol decoders to stack.\n");
					return 1;
				}
			}

			if (!(di_from = srd_inst_find_by_id(pds[0]))) {
				printf("Cannot stack protocol decoder '%s': instance not found.\n", pds[0]);
				return 1;
			}
			for (i = 1; pds[i]; i++) {
				if (!(di_to = srd_inst_find_by_id(pds[i]))) {
					printf("Cannot stack protocol decoder '%s': instance not found.\n", pds[i]);
					return 1;
				}
				if ((ret = srd_inst_stack(di_from, di_to)) != SRD_OK)
					return ret;

				/* Don't show annotation from this PD. Only the last PD in
				 * the stack will be left on the annotation list.
				 */
				g_datalist_remove_data(&pd_ann_visible, di_from->inst_id);

				di_from = di_to;
			}
		}
		g_strfreev(pds);
	}

	if (!opt_output_format) {
		opt_output_format = DEFAULT_OUTPUT_FORMAT;
		/* we'll need to remember this so when saving to a file
		 * later, sigrok session format will be used.
		 */
		default_output_format = TRUE;
	}
	fmtargs = parse_generic_arg(opt_output_format);
	fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
	if (!fmtspec) {
		printf("Invalid output format.\n");
		return 1;
	}
	outputs = sr_output_list();
	for (i = 0; outputs[i]; i++) {
		if (strcmp(outputs[i]->id, fmtspec))
			continue;
		g_hash_table_remove(fmtargs, "sigrok_key");
		output_format = outputs[i];
		g_hash_table_iter_init(&iter, fmtargs);
		while (g_hash_table_iter_next(&iter, &key, &value)) {
			/* only supporting one parameter per output module
			 * for now, and only its value */
			output_format_param = g_strdup(value);
			break;
		}
		break;
	}
	if (!output_format) {
		printf("invalid output format %s\n", opt_output_format);
		return 1;
	}

	if (opt_version)
		show_version();
	else if (opt_list_devs)
		show_dev_list();
	else if (opt_input_file)
		load_input_file();
	else if (opt_samples || opt_time || opt_continuous)
		run_session();
	else if (opt_dev)
		show_dev_detail();
	else if (opt_pds)
		show_pd_detail();
	else
		printf("%s", g_option_context_get_help(context, TRUE, NULL));

	if (opt_pds)
		srd_exit();

	g_option_context_free(context);
	g_hash_table_destroy(fmtargs);
	sr_exit();

	return 0;
}