util/SplitString: new utility class

Replaces GLib's g_strsplit().

Makefile.am

@@ -375,6 +375,7 @@ libutil_a_SOURCES = \
 	src/util/NumberParser.hxx \
 	src/util/StringUtil.cxx src/util/StringUtil.hxx \
 	src/util/DivideString.cxx src/util/DivideString.hxx \
+	src/util/SplitString.cxx src/util/SplitString.hxx \
 	src/util/FormatString.cxx src/util/FormatString.hxx \
 	src/util/Tokenizer.cxx src/util/Tokenizer.hxx \
 	src/util/TextFile.hxx \
@@ -2002,6 +2003,7 @@ endif
 
 test_test_util_SOURCES = \
 	test/DivideStringTest.hxx \
+	test/SplitStringTest.hxx \
 	test/UriUtilTest.hxx \
 	test/TestCircularBuffer.hxx \
 	test/test_util.cxx

configure.ac

@@ -1237,9 +1237,8 @@ fi
 AM_CONDITIONAL(ENABLE_HTTPD_OUTPUT, test x$enable_httpd_output = xyes)
 
 dnl ----------------------------------- JACK ----------------------------------
-MPD_ENABLE_AUTO_PKG_DEPENDS(jack, JACK, [jack >= 0.100],
-	[JACK output plugin], [libjack not found], [],
-	[enable_glib], [Cannot use --enable-jack with --disable-glib])
+MPD_ENABLE_AUTO_PKG(jack, JACK, [jack >= 0.100],
+	[JACK output plugin], [libjack not found])
 
 if test x$enable_jack = xyes; then
 	# check whether jack_set_info_function() is available
@@ -1252,9 +1251,8 @@ if test x$enable_jack = xyes; then
 fi
 
 dnl ---------------------------------- libao ----------------------------------
-MPD_ENABLE_AUTO_PKG_DEPENDS(ao, AO, [ao],
-	[libao output plugin], [libao not found], [],
-	[enable_glib], [Cannot use --enable-ao with --disable-glib])
+MPD_ENABLE_AUTO_PKG(ao, AO, [ao],
+	[libao output plugin], [libao not found])
 
 dnl ---------------------------------- OpenAL ---------------------------------
 AC_SUBST(OPENAL_CFLAGS,"")

src/output/plugins/AoOutputPlugin.cxx

@@ -21,12 +21,12 @@
 #include "AoOutputPlugin.hxx"
 #include "../OutputAPI.hxx"
 #include "util/DivideString.hxx"
+#include "util/SplitString.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "Log.hxx"
 
 #include <ao/ao.h>
-#include <glib.h>
 
 #include <string.h>
 
@@ -127,22 +127,18 @@ AoOutput::Configure(const config_param &param, Error &error)
 
 	value = param.GetBlockValue("options", nullptr);
 	if (value != nullptr) {
-		gchar **_options = g_strsplit(value, ";", 0);
-
-		for (unsigned i = 0; _options[i] != nullptr; ++i) {
-			const DivideString ss(_options[i], '=');
+		for (const auto &i : SplitString(value, ';')) {
+			const DivideString ss(i.c_str(), '=');
 
 			if (!ss.IsDefined()) {
 				error.Format(ao_output_domain,
 					     "problems parsing options \"%s\"",
-					     _options[i]);
+					     i.c_str());
 				return false;
 			}
 
 			ao_append_option(&options, ss.GetFirst(), ss.GetSecond());
 		}
-
-		g_strfreev(_options);
 	}
 
 	return true;

src/output/plugins/JackOutputPlugin.cxx

@@ -21,13 +21,13 @@
 #include "JackOutputPlugin.hxx"
 #include "../OutputAPI.hxx"
 #include "config/ConfigError.hxx"
+#include "util/SplitString.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "Log.hxx"
 
 #include <assert.h>
 
-#include <glib.h>
 #include <jack/jack.h>
 #include <jack/types.h>
 #include <jack/ringbuffer.h>
@@ -56,10 +56,10 @@ struct JackOutput {
 
 	/* configuration */
 
-	char *source_ports[MAX_PORTS];
+	std::string source_ports[MAX_PORTS];
 	unsigned num_source_ports;
 
-	char *destination_ports[MAX_PORTS];
+	std::string destination_ports[MAX_PORTS];
 	unsigned num_destination_ports;
 
 	size_t ringbuffer_size;
@@ -261,13 +261,13 @@ mpd_jack_connect(JackOutput *jd, Error &error)
 
 	for (unsigned i = 0; i < jd->num_source_ports; ++i) {
 		jd->ports[i] = jack_port_register(jd->client,
-						  jd->source_ports[i],
+						  jd->source_ports[i].c_str(),
 						  JACK_DEFAULT_AUDIO_TYPE,
 						  JackPortIsOutput, 0);
 		if (jd->ports[i] == nullptr) {
 			error.Format(jack_output_domain,
 				     "Cannot register output port \"%s\"",
-				     jd->source_ports[i]);
+				     jd->source_ports[i].c_str());
 			mpd_jack_disconnect(jd);
 			return false;
 		}
@@ -283,23 +283,19 @@ mpd_jack_test_default_device(void)
 }
 
 static unsigned
-parse_port_list(const char *source, char **dest, Error &error)
+parse_port_list(const char *source, std::string dest[], Error &error)
 {
-	char **list = g_strsplit(source, ",", 0);
 	unsigned n = 0;
-
-	for (n = 0; list[n] != nullptr; ++n) {
+	for (auto &&i : SplitString(source, ',')) {
 		if (n >= MAX_PORTS) {
 			error.Set(config_domain,
 				  "too many port names");
 			return 0;
 		}
 
-		dest[n] = list[n];
+		dest[n++] = std::move(i);
 	}
 
-	g_free(list);
-
 	if (n == 0) {
 		error.Format(config_domain,
 			     "at least one port name expected");
@@ -392,12 +388,6 @@ mpd_jack_finish(AudioOutput *ao)
 {
 	JackOutput *jd = (JackOutput *)ao;
 
-	for (unsigned i = 0; i < jd->num_source_ports; ++i)
-		g_free(jd->source_ports[i]);
-
-	for (unsigned i = 0; i < jd->num_destination_ports; ++i)
-		g_free(jd->destination_ports[i]);
-
 	delete jd;
 }
 
@@ -505,8 +495,8 @@ mpd_jack_start(JackOutput *jd, Error &error)
 		/* use the configured output ports */
 
 		num_destination_ports = jd->num_destination_ports;
-		memcpy(destination_ports, jd->destination_ports,
-		       num_destination_ports * sizeof(*destination_ports));
+		for (unsigned i = 0; i < num_destination_ports; ++i)
+			destination_ports[i] = jd->destination_ports[i].c_str();
 
 		jports = nullptr;
 	}

src/util/SplitString.cxx

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "SplitString.hxx"
+#include "StringUtil.hxx"
+
+#include <string.h>
+
+std::forward_list<std::string>
+SplitString(const char *s, char separator, bool strip)
+{
+	if (strip)
+		s = StripLeft(s);
+
+	std::forward_list<std::string> list;
+	if (*s == 0)
+		return list;
+
+	auto i = list.before_begin();
+
+	while (true) {
+		const char *next = strchr(s, separator);
+		if (next == nullptr)
+			break;
+
+		const char *end = next++;
+		if (strip)
+			end = StripRight(s, end);
+
+		i = list.emplace_after(i, s, end);
+
+		s = next;
+		if (strip)
+			s = StripLeft(s);
+	}
+
+	const char *end = s + strlen(s);
+	if (strip)
+		end = StripRight(s, end);
+
+	list.emplace_after(i, s, end);
+	return list;
+}

src/util/SplitString.hxx

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_SPLIT_STRING_HXX
+#define MPD_SPLIT_STRING_HXX
+
+#include <forward_list>
+#include <string>
+
+/**
+ * Split a string at a certain separator character into sub strings
+ * and returns a list of these.
+ *
+ * Two consecutive separator characters result in an empty string in
+ * the list.
+ *
+ * An empty input string, as a special case, results in an empty list
+ * (and not a list with an empty string).
+ */
+std::forward_list<std::string>
+SplitString(const char *s, char separator, bool strip=true);
+
+#endif

test/SplitStringTest.hxx

@@ -0,0 +1,65 @@
+/*
+ * Unit tests for src/util/
+ */
+
+#include "check.h"
+#include "util/SplitString.hxx"
+#include "util/Macros.hxx"
+
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/HelperMacros.h>
+
+#include <string.h>
+
+class SplitStringTest : public CppUnit::TestFixture {
+	CPPUNIT_TEST_SUITE(SplitStringTest);
+	CPPUNIT_TEST(TestBasic);
+	CPPUNIT_TEST(TestStrip);
+	CPPUNIT_TEST(TestNoStrip);
+	CPPUNIT_TEST(TestEmpty);
+	CPPUNIT_TEST_SUITE_END();
+
+public:
+	void TestBasic() {
+		constexpr char input[] = "foo.bar";
+		const char *const output[] = { "foo", "bar" };
+		size_t i = 0;
+		for (auto p : SplitString(input, '.')) {
+			CPPUNIT_ASSERT(i < ARRAY_SIZE(output));
+			CPPUNIT_ASSERT(p == output[i]);
+			++i;
+		}
+
+		CPPUNIT_ASSERT_EQUAL(ARRAY_SIZE(output), i);
+	}
+
+	void TestStrip() {
+		constexpr char input[] = " foo\t.\r\nbar\r\n2";
+		const char *const output[] = { "foo", "bar\r\n2" };
+		size_t i = 0;
+		for (auto p : SplitString(input, '.')) {
+			CPPUNIT_ASSERT(i < ARRAY_SIZE(output));
+			CPPUNIT_ASSERT(p == output[i]);
+			++i;
+		}
+
+		CPPUNIT_ASSERT_EQUAL(ARRAY_SIZE(output), i);
+	}
+
+	void TestNoStrip() {
+		constexpr char input[] = " foo\t.\r\nbar\r\n2";
+		const char *const output[] = { " foo\t", "\r\nbar\r\n2" };
+		size_t i = 0;
+		for (auto p : SplitString(input, '.', false)) {
+			CPPUNIT_ASSERT(i < ARRAY_SIZE(output));
+			CPPUNIT_ASSERT(p == output[i]);
+			++i;
+		}
+
+		CPPUNIT_ASSERT_EQUAL(ARRAY_SIZE(output), i);
+	}
+
+	void TestEmpty() {
+		CPPUNIT_ASSERT(SplitString("", '.').empty());
+	}
+};

test/test_util.cxx

@@ -4,6 +4,7 @@
 
 #include "config.h"
 #include "DivideStringTest.hxx"
+#include "SplitStringTest.hxx"
 #include "UriUtilTest.hxx"
 #include "TestCircularBuffer.hxx"
 
@@ -15,6 +16,7 @@
 #include <stdlib.h>
 
 CPPUNIT_TEST_SUITE_REGISTRATION(DivideStringTest);
+CPPUNIT_TEST_SUITE_REGISTRATION(SplitStringTest);
 CPPUNIT_TEST_SUITE_REGISTRATION(UriUtilTest);
 CPPUNIT_TEST_SUITE_REGISTRATION(TestCircularBuffer);