parsers.c - chromiumos/third_party/libsigrok-cli - Git at Google

 /*
  * This file is part of the sigrok-cli project.
  *
  * Copyright (C) 2011 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 <config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
 #include <glib.h>
 #include "sigrok-cli.h"

 struct sr_channel *find_channel(GSList *channellist, const char *channelname)
 {
 	struct sr_channel *ch;
 	GSList *l;

 	ch = NULL;
 	for (l = channellist; l; l = l->next) {
 		ch = l->data;
 		if (!strcmp(ch->name, channelname))
 			break;
 	}
 	ch = l ? l->data : NULL;

 	return ch;
 }

 GSList *parse_channelstring(struct sr_dev_inst *sdi, const char *channelstring)
 {
 	struct sr_channel *ch;
 	GSList *channellist, *channels;
 	int ret, n, b, e, i;
 	char **tokens, **range, **names, *eptr, str[8];

 	channels = sr_dev_inst_channels_get(sdi);

 	if (!channelstring || !channelstring[0])
 		/* Use all channels by default. */
 		return g_slist_copy(channels);

 	ret = SR_OK;
 	range = NULL;
 	names = NULL;
 	channellist = NULL;
 	tokens = g_strsplit(channelstring, ",", 0);
 	for (i = 0; tokens[i]; i++) {
 		if (tokens[i][0] == '\0') {
 			g_critical("Invalid empty channel.");
 			ret = SR_ERR;
 			break;
 		}
 		if (strchr(tokens[i], '-')) {
 			/*
 			 * A range of channels in the form a-b. This will only work
 			 * if the channels are named as numbers -- so every channel
 			 * in the range must exist as a channel name string in the
 			 * device.
 			 */
 			range = g_strsplit(tokens[i], "-", 2);
 			if (!range[0] || !range[1] || range[2]) {
 				/* Need exactly two arguments. */
 				g_critical("Invalid channel syntax '%s'.", tokens[i]);
 				ret = SR_ERR;
 				goto range_fail;
 			}

 			b = strtol(range[0], &eptr, 10);
 			if (eptr == range[0] || *eptr != '\0') {
 				g_critical("Invalid channel '%s'.", range[0]);
 				ret = SR_ERR;
 				goto range_fail;
 			}
 			e = strtol(range[1], NULL, 10);
 			if (eptr == range[1] || *eptr != '\0') {
 				g_critical("Invalid channel '%s'.", range[1]);
 				ret = SR_ERR;
 				goto range_fail;
 			}
 			if (b < 0 || b >= e) {
 				g_critical("Invalid channel range '%s'.", tokens[i]);
 				ret = SR_ERR;
 				goto range_fail;
 			}

 			while (b <= e) {
 				n = snprintf(str, 8, "%d", b);
 				if (n < 0 || n > 8) {
 					g_critical("Invalid channel '%d'.", b);
 					ret = SR_ERR;
 					break;
 				}
 				ch = find_channel(channels, str);
 				if (!ch) {
 					g_critical("unknown channel '%d'.", b);
 					ret = SR_ERR;
 					break;
 				}
 				channellist = g_slist_append(channellist, ch);
 				b++;
 			}
 range_fail:
 			if (range)
 				g_strfreev(range);

 			if (ret != SR_OK)
 				break;
 		} else {
 			names = g_strsplit(tokens[i], "=", 2);
 			if (!names[0] || (names[1] && names[2])) {
 				/* Need one or two arguments. */
 				g_critical("Invalid channel '%s'.", tokens[i]);
 				g_strfreev(names);
 				ret = SR_ERR;
 				break;
 			}

 			ch = find_channel(channels, names[0]);
 			if (!ch) {
 				g_critical("unknown channel '%s'.", names[0]);
 				g_strfreev(names);
 				ret = SR_ERR;
 				break;
 			}
 			if (names[1]) {
 				/* Rename channel. */
 				g_free(ch->name);
 				ch->name = g_strdup(names[1]);
 			}
 			channellist = g_slist_append(channellist, ch);

 			g_strfreev(names);
 		}
 	}

 	if (ret != SR_OK) {
 		g_slist_free(channellist);
 		channellist = NULL;
 	}

 	g_strfreev(tokens);

 	return channellist;
 }

 int parse_trigger_match(char c)
 {
 	int match;

 	if (c == '0')
 		match = SR_TRIGGER_ZERO;
 	else if (c == '1')
 		match = SR_TRIGGER_ONE;
 	else if (c == 'r')
 		match = SR_TRIGGER_RISING;
 	else if (c == 'f')
 		match = SR_TRIGGER_FALLING;
 	else if (c == 'e')
 		match = SR_TRIGGER_EDGE;
 	else if (c == 'o')
 		match = SR_TRIGGER_OVER;
 	else if (c == 'u')
 		match = SR_TRIGGER_UNDER;
 	else
 		match = 0;

 	return match;
 }

 int parse_triggerstring(const struct sr_dev_inst *sdi, const char *s,
 		struct sr_trigger **trigger)
 {
 	struct sr_channel *ch;
 	struct sr_trigger_stage *stage;
 	GVariant *gvar;
 	GSList *l, *channels;
 	gsize num_matches;
 	gboolean found_match, error;
 	const int32_t *matches;
 	int32_t match;
 	unsigned int j;
 	int t, i;
 	char **tokens, *sep;
 	struct sr_dev_driver *driver;

 	driver = sr_dev_inst_driver_get(sdi);
 	channels = sr_dev_inst_channels_get(sdi);

 	if (maybe_config_list(driver, sdi, NULL, SR_CONF_TRIGGER_MATCH,
 			&gvar) != SR_OK) {
 		g_critical("Device doesn't support any triggers.");
 		return FALSE;
 	}
 	matches = g_variant_get_fixed_array(gvar, &num_matches, sizeof(int32_t));

 	*trigger = sr_trigger_new(NULL);
 	error = FALSE;
 	tokens = g_strsplit(s, ",", -1);
 	for (i = 0; tokens[i]; i++) {
 		if (!(sep = strchr(tokens[i], '='))) {
 			g_critical("Invalid trigger '%s'.", tokens[i]);
 			error = TRUE;
 			break;
 		}
 		*sep++ = 0;
 		ch = NULL;
 		for (l = channels; l; l = l->next) {
 			ch = l->data;
 			if (ch->enabled && !strcmp(ch->name, tokens[i]))
 				break;
 			ch = NULL;
 		}
 		if (!ch) {
 			g_critical("Invalid channel '%s'.", tokens[i]);
 			error = TRUE;
 			break;
 		}
 		for (t = 0; sep[t]; t++) {
 			if (!(match = parse_trigger_match(sep[t]))) {
 				g_critical("Invalid trigger match '%c'.", sep[t]);
 				error = TRUE;
 				break;
 			}
 			found_match = FALSE;
 			for (j = 0; j < num_matches; j++) {
 				if (matches[j] == match) {
 					found_match = TRUE;
 					break;
 				}
 			}
 			if (!found_match) {
 				g_critical("Trigger match '%c' not supported by device.", sep[t]);
 				error = TRUE;
 				break;
 			}
 			/* Make sure this ends up in the right stage, creating
 			 * them as needed. */
 			while (!(stage = g_slist_nth_data((*trigger)->stages, t)))
 				sr_trigger_stage_add(*trigger);
 			if (sr_trigger_match_add(stage, ch, match, 0) != SR_OK) {
 				error = TRUE;
 				break;
 			}
 		}
 	}
 	g_strfreev(tokens);
 	g_variant_unref(gvar);

 	if (error)
 		sr_trigger_free(*trigger);

 	return !error;
 }

 GHashTable *parse_generic_arg(const char *arg, gboolean sep_first)
 {
 	GHashTable *hash;
 	int i;
 	char **elements, *e;

 	if (!arg || !arg[0])
 		return NULL;

 	i = 0;
 	hash = g_hash_table_new_full(g_str_hash, g_str_equal,
 			g_free, g_free);
 	elements = g_strsplit(arg, ":", 0);
 	if (sep_first)
 		g_hash_table_insert(hash, g_strdup("sigrok_key"),
 				g_strdup(elements[i++]));
 	for (; elements[i]; i++) {
 		e = strchr(elements[i], '=');
 		if (!e)
 			g_hash_table_insert(hash, g_strdup(elements[i]), NULL);
 		else {
 			*e++ = '\0';
 			g_hash_table_insert(hash, g_strdup(elements[i]), g_strdup(e));
 		}
 	}
 	g_strfreev(elements);

 	return hash;
 }

 GHashTable *generic_arg_to_opt(const struct sr_option **opts, GHashTable *genargs)
 {
 	GHashTable *hash;
 	GVariant *gvar;
 	int i;
 	char *s;
 	gboolean b;

 	hash = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
 			(GDestroyNotify)g_variant_unref);
 	for (i = 0; opts[i]; i++) {
 		if (!(s = g_hash_table_lookup(genargs, opts[i]->id)))
 			continue;
 		if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_UINT32)) {
 			gvar = g_variant_new_uint32(strtoul(s, NULL, 10));
 			g_hash_table_insert(hash, g_strdup(opts[i]->id),
 					g_variant_ref_sink(gvar));
 		} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_INT32)) {
 			gvar = g_variant_new_int32(strtoul(s, NULL, 10));
 			g_hash_table_insert(hash, g_strdup(opts[i]->id),
 					g_variant_ref_sink(gvar));
 		} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_UINT64)) {
 			gvar = g_variant_new_uint64(strtoul(s, NULL, 10));
 			g_hash_table_insert(hash, g_strdup(opts[i]->id),
 					g_variant_ref_sink(gvar));
 		} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_DOUBLE)) {
 			gvar = g_variant_new_double(strtod(s, NULL));
 			g_hash_table_insert(hash, g_strdup(opts[i]->id),
 					g_variant_ref_sink(gvar));
 		} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_STRING)) {
 			gvar = g_variant_new_string(s);
 			g_hash_table_insert(hash, g_strdup(opts[i]->id),
 					g_variant_ref_sink(gvar));
 		} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_BOOLEAN)) {
 			b = TRUE;
 			if (0 == strcmp(s, "false") || 0 == strcmp(s, "no")) {
 				b = FALSE;
 			} else if (!(0 == strcmp(s, "true") || 0 == strcmp(s, "yes"))) {
 				g_critical("Unable to convert '%s' to boolean!", s);
 			}

 			gvar = g_variant_new_boolean(b);
 			g_hash_table_insert(hash, g_strdup(opts[i]->id),
 					g_variant_ref_sink(gvar));
 		} else {
 			g_critical("Don't know GVariant type for option '%s'!", opts[i]->id);
 		 }
 	}

 	return hash;
 }

 static char *strcanon(const char *str)
 {
 	int p0, p1;
 	char *s;

 	/* Returns newly allocated string. */
 	s = g_ascii_strdown(str, -1);
 	for (p0 = p1 = 0; str[p0]; p0++) {
 		if ((s[p0] >= 'a' && s[p0] <= 'z')
 				|| (s[p0] >= '0' && s[p0] <= '9'))
 			s[p1++] = s[p0];
 	}
 	s[p1] = '\0';

 	return s;
 }

 int canon_cmp(const char *str1, const char *str2)
 {
 	int ret;
 	char *s1, *s2;

 	s1 = strcanon(str1);
 	s2 = strcanon(str2);
 	ret = g_ascii_strcasecmp(s1, s2);
 	g_free(s2);
 	g_free(s1);

 	return ret;
 }

 /* Convert driver options hash to GSList of struct sr_config. */
 static GSList *hash_to_hwopt(GHashTable *hash)
 {
 	struct sr_config *src;
 	GList *gl, *keys;
 	GSList *opts;
 	char *key;

 	keys = g_hash_table_get_keys(hash);
 	opts = NULL;
 	for (gl = keys; gl; gl = gl->next) {
 		key = gl->data;
 		src = g_malloc(sizeof(struct sr_config));
 		if (opt_to_gvar(key, g_hash_table_lookup(hash, key), src) != 0)
 			return NULL;
 		opts = g_slist_append(opts, src);
 	}
 	g_list_free(keys);

 	return opts;
 }

 int parse_driver(char *arg, struct sr_dev_driver **driver, GSList **drvopts)
 {
 	struct sr_dev_driver **drivers;
 	GHashTable *drvargs;
 	int i;
 	char *drvname;

 	if (!arg)
 		return FALSE;

 	drvargs = parse_generic_arg(arg, TRUE);

 	drvname = g_strdup(g_hash_table_lookup(drvargs, "sigrok_key"));
 	g_hash_table_remove(drvargs, "sigrok_key");
 	*driver = NULL;
 	drivers = sr_driver_list(sr_ctx);
 	for (i = 0; drivers[i]; i++) {
 		if (strcmp(drivers[i]->name, drvname))
 			continue;
 		*driver = drivers[i];
 	}
 	if (!*driver) {
 		g_critical("Driver %s not found.", drvname);
 		g_hash_table_destroy(drvargs);
 		g_free(drvname);
 		return FALSE;
 	}
 	g_free(drvname);
 	if (sr_driver_init(sr_ctx, *driver) != SR_OK) {
 		g_critical("Failed to initialize driver.");
 		g_hash_table_destroy(drvargs);
 		return FALSE;
 	}

 	if (drvopts) {
 		*drvopts = NULL;
 		if (g_hash_table_size(drvargs) > 0) {
 			if (!(*drvopts = hash_to_hwopt(drvargs))) {
 				/* Unknown options, already logged. */
 				g_hash_table_destroy(drvargs);
 				return FALSE;
 			}
 		}
 	}

 	g_hash_table_destroy(drvargs);

 	return TRUE;
 }
	/*
	* This file is part of the sigrok-cli project.
	*
	* Copyright (C) 2011 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 <config.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <stdint.h>
	#include <string.h>
	#include <glib.h>
	#include "sigrok-cli.h"

	struct sr_channel find_channel(GSList channellist, const char *channelname)
	{
	struct sr_channel *ch;
	GSList *l;

	ch = NULL;
	for (l = channellist; l; l = l->next) {
	ch = l->data;
	if (!strcmp(ch->name, channelname))
	break;
	}
	ch = l ? l->data : NULL;

	return ch;
	}

	GSList parse_channelstring(struct sr_dev_inst sdi, const char *channelstring)
	{
	struct sr_channel *ch;
	GSList channellist, channels;
	int ret, n, b, e, i;
	char tokens, range, *names, eptr, str[8];

	channels = sr_dev_inst_channels_get(sdi);

	if (!channelstring \|\| !channelstring[0])
	/* Use all channels by default. */
	return g_slist_copy(channels);

	ret = SR_OK;
	range = NULL;
	names = NULL;
	channellist = NULL;
	tokens = g_strsplit(channelstring, ",", 0);
	for (i = 0; tokens[i]; i++) {
	if (tokens[i][0] == '\0') {
	g_critical("Invalid empty channel.");
	ret = SR_ERR;
	break;
	}
	if (strchr(tokens[i], '-')) {
	/*
	* A range of channels in the form a-b. This will only work
	* if the channels are named as numbers -- so every channel
	* in the range must exist as a channel name string in the
	* device.
	*/
	range = g_strsplit(tokens[i], "-", 2);
	if (!range[0] \|\| !range[1] \|\| range[2]) {
	/* Need exactly two arguments. */
	g_critical("Invalid channel syntax '%s'.", tokens[i]);
	ret = SR_ERR;
	goto range_fail;
	}

	b = strtol(range[0], &eptr, 10);
	if (eptr == range[0] \|\| *eptr != '\0') {
	g_critical("Invalid channel '%s'.", range[0]);
	ret = SR_ERR;
	goto range_fail;
	}
	e = strtol(range[1], NULL, 10);
	if (eptr == range[1] \|\| *eptr != '\0') {
	g_critical("Invalid channel '%s'.", range[1]);
	ret = SR_ERR;
	goto range_fail;
	}
	if (b < 0 \|\| b >= e) {
	g_critical("Invalid channel range '%s'.", tokens[i]);
	ret = SR_ERR;
	goto range_fail;
	}

	while (b <= e) {
	n = snprintf(str, 8, "%d", b);
	if (n < 0 \|\| n > 8) {
	g_critical("Invalid channel '%d'.", b);
	ret = SR_ERR;
	break;
	}
	ch = find_channel(channels, str);
	if (!ch) {
	g_critical("unknown channel '%d'.", b);
	ret = SR_ERR;
	break;
	}
	channellist = g_slist_append(channellist, ch);
	b++;
	}
	range_fail:
	if (range)
	g_strfreev(range);

	if (ret != SR_OK)
	break;
	} else {
	names = g_strsplit(tokens[i], "=", 2);
	if (!names[0] \|\| (names[1] && names[2])) {
	/* Need one or two arguments. */
	g_critical("Invalid channel '%s'.", tokens[i]);
	g_strfreev(names);
	ret = SR_ERR;
	break;
	}

	ch = find_channel(channels, names[0]);
	if (!ch) {
	g_critical("unknown channel '%s'.", names[0]);
	g_strfreev(names);
	ret = SR_ERR;
	break;
	}
	if (names[1]) {
	/* Rename channel. */
	g_free(ch->name);
	ch->name = g_strdup(names[1]);
	}
	channellist = g_slist_append(channellist, ch);

	g_strfreev(names);
	}
	}

	if (ret != SR_OK) {
	g_slist_free(channellist);
	channellist = NULL;
	}

	g_strfreev(tokens);

	return channellist;
	}

	int parse_trigger_match(char c)
	{
	int match;

	if (c == '0')
	match = SR_TRIGGER_ZERO;
	else if (c == '1')
	match = SR_TRIGGER_ONE;
	else if (c == 'r')
	match = SR_TRIGGER_RISING;
	else if (c == 'f')
	match = SR_TRIGGER_FALLING;
	else if (c == 'e')
	match = SR_TRIGGER_EDGE;
	else if (c == 'o')
	match = SR_TRIGGER_OVER;
	else if (c == 'u')
	match = SR_TRIGGER_UNDER;
	else
	match = 0;

	return match;
	}

	int parse_triggerstring(const struct sr_dev_inst sdi, const char s,
	struct sr_trigger **trigger)
	{
	struct sr_channel *ch;
	struct sr_trigger_stage *stage;
	GVariant *gvar;
	GSList l, channels;
	gsize num_matches;
	gboolean found_match, error;
	const int32_t *matches;
	int32_t match;
	unsigned int j;
	int t, i;
	char *tokens, sep;
	struct sr_dev_driver *driver;

	driver = sr_dev_inst_driver_get(sdi);
	channels = sr_dev_inst_channels_get(sdi);

	if (maybe_config_list(driver, sdi, NULL, SR_CONF_TRIGGER_MATCH,
	&gvar) != SR_OK) {
	g_critical("Device doesn't support any triggers.");
	return FALSE;
	}
	matches = g_variant_get_fixed_array(gvar, &num_matches, sizeof(int32_t));

	*trigger = sr_trigger_new(NULL);
	error = FALSE;
	tokens = g_strsplit(s, ",", -1);
	for (i = 0; tokens[i]; i++) {
	if (!(sep = strchr(tokens[i], '='))) {
	g_critical("Invalid trigger '%s'.", tokens[i]);
	error = TRUE;
	break;
	}
	*sep++ = 0;
	ch = NULL;
	for (l = channels; l; l = l->next) {
	ch = l->data;
	if (ch->enabled && !strcmp(ch->name, tokens[i]))
	break;
	ch = NULL;
	}
	if (!ch) {
	g_critical("Invalid channel '%s'.", tokens[i]);
	error = TRUE;
	break;
	}
	for (t = 0; sep[t]; t++) {
	if (!(match = parse_trigger_match(sep[t]))) {
	g_critical("Invalid trigger match '%c'.", sep[t]);
	error = TRUE;
	break;
	}
	found_match = FALSE;
	for (j = 0; j < num_matches; j++) {
	if (matches[j] == match) {
	found_match = TRUE;
	break;
	}
	}
	if (!found_match) {
	g_critical("Trigger match '%c' not supported by device.", sep[t]);
	error = TRUE;
	break;
	}
	/* Make sure this ends up in the right stage, creating
	* them as needed. */
	while (!(stage = g_slist_nth_data((*trigger)->stages, t)))
	sr_trigger_stage_add(*trigger);
	if (sr_trigger_match_add(stage, ch, match, 0) != SR_OK) {
	error = TRUE;
	break;
	}
	}
	}
	g_strfreev(tokens);
	g_variant_unref(gvar);

	if (error)
	sr_trigger_free(*trigger);

	return !error;
	}

	GHashTable parse_generic_arg(const char arg, gboolean sep_first)
	{
	GHashTable *hash;
	int i;
	char *elements, e;

	if (!arg \|\| !arg[0])
	return NULL;

	i = 0;
	hash = g_hash_table_new_full(g_str_hash, g_str_equal,
	g_free, g_free);
	elements = g_strsplit(arg, ":", 0);
	if (sep_first)
	g_hash_table_insert(hash, g_strdup("sigrok_key"),
	g_strdup(elements[i++]));
	for (; elements[i]; i++) {
	e = strchr(elements[i], '=');
	if (!e)
	g_hash_table_insert(hash, g_strdup(elements[i]), NULL);
	else {
	*e++ = '\0';
	g_hash_table_insert(hash, g_strdup(elements[i]), g_strdup(e));
	}
	}
	g_strfreev(elements);

	return hash;
	}

	GHashTable generic_arg_to_opt(const struct sr_option opts, GHashTable genargs)
	{
	GHashTable *hash;
	GVariant *gvar;
	int i;
	char *s;
	gboolean b;

	hash = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
	(GDestroyNotify)g_variant_unref);
	for (i = 0; opts[i]; i++) {
	if (!(s = g_hash_table_lookup(genargs, opts[i]->id)))
	continue;
	if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_UINT32)) {
	gvar = g_variant_new_uint32(strtoul(s, NULL, 10));
	g_hash_table_insert(hash, g_strdup(opts[i]->id),
	g_variant_ref_sink(gvar));
	} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_INT32)) {
	gvar = g_variant_new_int32(strtoul(s, NULL, 10));
	g_hash_table_insert(hash, g_strdup(opts[i]->id),
	g_variant_ref_sink(gvar));
	} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_UINT64)) {
	gvar = g_variant_new_uint64(strtoul(s, NULL, 10));
	g_hash_table_insert(hash, g_strdup(opts[i]->id),
	g_variant_ref_sink(gvar));
	} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_DOUBLE)) {
	gvar = g_variant_new_double(strtod(s, NULL));
	g_hash_table_insert(hash, g_strdup(opts[i]->id),
	g_variant_ref_sink(gvar));
	} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_STRING)) {
	gvar = g_variant_new_string(s);
	g_hash_table_insert(hash, g_strdup(opts[i]->id),
	g_variant_ref_sink(gvar));
	} else if (g_variant_is_of_type(opts[i]->def, G_VARIANT_TYPE_BOOLEAN)) {
	b = TRUE;
	if (0 == strcmp(s, "false") \|\| 0 == strcmp(s, "no")) {
	b = FALSE;
	} else if (!(0 == strcmp(s, "true") \|\| 0 == strcmp(s, "yes"))) {
	g_critical("Unable to convert '%s' to boolean!", s);
	}

	gvar = g_variant_new_boolean(b);
	g_hash_table_insert(hash, g_strdup(opts[i]->id),
	g_variant_ref_sink(gvar));
	} else {
	g_critical("Don't know GVariant type for option '%s'!", opts[i]->id);
	}
	}

	return hash;
	}

	static char strcanon(const char str)
	{
	int p0, p1;
	char *s;

	/* Returns newly allocated string. */
	s = g_ascii_strdown(str, -1);
	for (p0 = p1 = 0; str[p0]; p0++) {
	if ((s[p0] >= 'a' && s[p0] <= 'z')
	\|\| (s[p0] >= '0' && s[p0] <= '9'))
	s[p1++] = s[p0];
	}
	s[p1] = '\0';

	return s;
	}

	int canon_cmp(const char str1, const char str2)
	{
	int ret;
	char s1, s2;

	s1 = strcanon(str1);
	s2 = strcanon(str2);
	ret = g_ascii_strcasecmp(s1, s2);
	g_free(s2);
	g_free(s1);

	return ret;
	}

	/* Convert driver options hash to GSList of struct sr_config. */
	static GSList hash_to_hwopt(GHashTable hash)
	{
	struct sr_config *src;
	GList gl, keys;
	GSList *opts;
	char *key;

	keys = g_hash_table_get_keys(hash);
	opts = NULL;
	for (gl = keys; gl; gl = gl->next) {
	key = gl->data;
	src = g_malloc(sizeof(struct sr_config));
	if (opt_to_gvar(key, g_hash_table_lookup(hash, key), src) != 0)
	return NULL;
	opts = g_slist_append(opts, src);
	}
	g_list_free(keys);

	return opts;
	}

	int parse_driver(char arg, struct sr_dev_driver driver, GSList *drvopts)
	{
	struct sr_dev_driver **drivers;
	GHashTable *drvargs;
	int i;
	char *drvname;

	if (!arg)
	return FALSE;

	drvargs = parse_generic_arg(arg, TRUE);

	drvname = g_strdup(g_hash_table_lookup(drvargs, "sigrok_key"));
	g_hash_table_remove(drvargs, "sigrok_key");
	*driver = NULL;
	drivers = sr_driver_list(sr_ctx);
	for (i = 0; drivers[i]; i++) {
	if (strcmp(drivers[i]->name, drvname))
	continue;
	*driver = drivers[i];
	}
	if (!*driver) {
	g_critical("Driver %s not found.", drvname);
	g_hash_table_destroy(drvargs);
	g_free(drvname);
	return FALSE;
	}
	g_free(drvname);
	if (sr_driver_init(sr_ctx, *driver) != SR_OK) {
	g_critical("Failed to initialize driver.");
	g_hash_table_destroy(drvargs);
	return FALSE;
	}

	if (drvopts) {
	*drvopts = NULL;
	if (g_hash_table_size(drvargs) > 0) {
	if (!(*drvopts = hash_to_hwopt(drvargs))) {
	/* Unknown options, already logged. */
	g_hash_table_destroy(drvargs);
	return FALSE;
	}
	}
	}

	g_hash_table_destroy(drvargs);

	return TRUE;
	}