Prefer std::regex, and modern C++ string search

libs/ardour/port_engine_shared.cc

@@ -18,7 +18,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <regex.h>
+#include <regex>
 
 #include "pbd/error.h"
 
@@ -289,11 +289,14 @@ PortEngineSharedImpl::get_ports (
 	std::vector<std::string>& port_names) const
 {
 	int rv = 0;
-	regex_t port_regex;
+	std::regex port_regex;
 	bool use_regexp = false;
-	if (port_name_pattern.size () > 0) {
-		if (!regcomp (&port_regex, port_name_pattern.c_str (), REG_EXTENDED|REG_NOSUB)) {
+	if (!port_name_pattern.empty()) {
+		try {
+			port_regex.assign (port_name_pattern, std::regex::extended);
 			use_regexp = true;
+		} catch (const std::regex_error&) {
+			use_regexp = false;
 		}
 	}
 
@@ -301,15 +304,12 @@ PortEngineSharedImpl::get_ports (
 
 	for (auto const& port : *p) {
 		if ((port->type () == type) && flags == (port->flags () & flags)) {
-			if (!use_regexp || !regexec (&port_regex, port->name ().c_str (), 0, NULL, 0)) {
+			if (!use_regexp || std::regex_search (port->name(), port_regex)) {
 				port_names.push_back (port->name ());
 				++rv;
 			}
 		}
 	}
-	if (use_regexp) {
-		regfree (&port_regex);
-	}
 	return rv;
 }
 

libs/ardour/port_manager.cc

@@ -24,8 +24,6 @@
 #ifdef COMPILER_MSVC
 #include <ardourext/misc.h>
 #include <io.h> // Microsoft's nearest equivalent to <unistd.h>
-#else
-#include <regex.h>
 #endif
 
 #include <glibmm/fileutils.h>
@@ -1493,40 +1491,29 @@ PortManager::port_engine ()
 bool
 PortManager::port_is_control_only (std::string const& name)
 {
-	static regex_t compiled_pattern;
-	static string  pattern;
-
-	if (pattern.empty ()) {
-		/* This is a list of regular expressions that match ports
-		 * related to physical MIDI devices that we do not want to
-		 * expose as normal physical ports.
+	/* This is a list of substrings that identify ports related
+	 * to physical MIDI devices that we do not want to expose as
+	 * normal physical ports.
 	 */
 
-		const char* const control_only_ports[] = {
-			X_(".*Ableton Push.*"),
-			X_(".*FaderPort .*"),
-			X_(".*FaderPort8 .*"),
-			X_(".*FaderPort16 .*"),
-			X_(".*FaderPort2 .*"),
-			X_(".*US-2400 .*"),
-			X_(".*Mackie .*"),
-			X_(".*MIDI Control .*"),
-			X_(".*Console1 .*"),
+	static const char* const control_only_ports[] = {
+		X_("Ableton Push"),
+		X_("FaderPort "),
+		X_("FaderPort8 "),
+		X_("FaderPort16 "),
+		X_("FaderPort2 "),
+		X_("US-2400 "),
+		X_("Mackie "),
+		X_("MIDI Control "),
+		X_("Console1 "),
 	};
 
-		pattern = "(";
 	for (size_t n = 0; n < sizeof (control_only_ports) / sizeof (control_only_ports[0]); ++n) {
-			if (n > 0) {
-				pattern += '|';
+		if (name.find (control_only_ports[n]) != string::npos) {
+			return true;
 		}
-			pattern += control_only_ports[n];
 	}
-		pattern += ')';
-
-		regcomp (&compiled_pattern, pattern.c_str (), REG_EXTENDED | REG_NOSUB);
-	}
-
-	return regexec (&compiled_pattern, name.c_str (), 0, 0, 0) == 0;
+	return false;
 }
 
 static bool

libs/ardour/smf_source.cc

@@ -27,9 +27,11 @@
 
 #include <sys/time.h>
 #include <sys/stat.h>
-#include <unistd.h>
 #include <errno.h>
-#include <regex.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
 #include "pbd/file_utils.h"
 #include "pbd/stl_delete.h"
@@ -688,11 +690,6 @@ SMFSource::valid_midi_file (const string& file)
 bool
 SMFSource::safe_midi_file_extension (const string& file)
 {
-	static regex_t compiled_pattern;
-	static bool compile = true;
-	const int nmatches = 2;
-	regmatch_t matches[nmatches];
-
 	if (Glib::file_test (file, Glib::FILE_TEST_EXISTS)) {
 		if (!Glib::file_test (file, Glib::FILE_TEST_IS_REGULAR)) {
 			/* exists but is not a regular file */
@@ -700,17 +697,14 @@ SMFSource::safe_midi_file_extension (const string& file)
 		}
 	}
 
-	if (compile && regcomp (&compiled_pattern, "\\.[mM][iI][dD][iI]?$", REG_EXTENDED)) {
-		return false;
-	} else {
-		compile = false;
-	}
-
-	if (regexec (&compiled_pattern, file.c_str(), nmatches, matches, 0)) {
+	const size_t dot_pos = file.rfind ('.');
+	if (dot_pos == string::npos) {
 		return false;
 	}
 
-	return true;
+	std::string const ext = PBD::downcase (file.substr(dot_pos + 1));
+
+	return ext == "mid" || ext == "midi";
 }
 
 static bool compare_eventlist (

libs/ardour/utils.cc

@@ -37,14 +37,9 @@
 #include <cstring>
 #include <cerrno>
 #include <iostream>
-#include <sys/types.h>
 #include <sys/time.h>
-#include <fcntl.h>
-#ifndef COMPILER_MSVC
-#include <dirent.h>
-#endif
 #include <errno.h>
-#include <regex.h>
+#include <fcntl.h>
 
 #include "pbd/gstdio_compat.h"
 
@@ -673,45 +668,30 @@ bool
 ARDOUR::matching_unsuffixed_filename_exists_in (const string& dir, const string& path)
 {
 	string bws = basename_nosuffix (path);
-	struct dirent* dentry;
-	GStatBuf statbuf;
-	DIR* dead;
-	bool ret = false;
 
-        if ((dead = ::opendir (dir.c_str())) == 0) {
-                error << string_compose (_("cannot open directory %1 (%2)"), dir, strerror (errno)) << endl;
+	try {
+		Glib::Dir directory (dir);
+
+		for (const auto& name : directory) {
+			if (name == "." || name == "..") {
+				continue;
+			}
+
+			string fullpath = Glib::build_filename (dir, name);
+			if (!Glib::file_test (fullpath, Glib::FILE_TEST_IS_REGULAR)) {
+				continue;
+			}
+
+			if (basename_nosuffix (name) == bws) {
+				return true;
+			}
+		}
+	} catch (const Glib::Error& e) {
+		error << string_compose (_("cannot open directory %1 (%2)"), dir, e.what()) << endl;
 		return false;
 	}
 
-        while ((dentry = ::readdir (dead)) != 0) {
-
-                /* avoid '.' and '..' */
-
-                if ((dentry->d_name[0] == '.' && dentry->d_name[1] == '\0') ||
-                    (dentry->d_name[2] == '\0' && dentry->d_name[0] == '.' && dentry->d_name[1] == '.')) {
-                        continue;
-                }
-
-                string fullpath = Glib::build_filename (dir, dentry->d_name);
-
-                if (g_stat (fullpath.c_str(), &statbuf)) {
-                        continue;
-                }
-
-                if (!S_ISREG (statbuf.st_mode)) {
-                        continue;
-                }
-
-                string bws2 = basename_nosuffix (dentry->d_name);
-
-                if (bws2 == bws) {
-                        ret = true;
-                        break;
-                }
-        }
-
-        ::closedir (dead);
-        return ret;
+	return false;
 }
 
 uint32_t

libs/backends/alsa/alsa_audiobackend.cc

@@ -18,7 +18,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <regex.h>
 #include <sys/mman.h>
 #include <sys/time.h>
 

libs/backends/coreaudio/coreaudio_backend.cc

@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <regex.h>
 #include <sys/mman.h>
 #include <sys/time.h>
 

libs/backends/dummy/dummy_audiobackend.cc

@@ -21,7 +21,6 @@
 
 #include <math.h>
 #include <sys/time.h>
-#include <regex.h>
 #include <stdlib.h>
 
 #include <glibmm.h>

libs/backends/portaudio/portaudio_backend.cc

@@ -18,8 +18,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <regex.h>
-
 #ifndef PLATFORM_WINDOWS
 #include <sys/mman.h>
 #include <sys/time.h>

libs/backends/pulseaudio/pulseaudio_backend.cc

@@ -17,7 +17,6 @@
  */
 
 #include <math.h>
-#include <regex.h>
 #include <stdlib.h>
 #include <sys/mman.h>
 #include <sys/time.h>

libs/surfaces/generic_midi/generic_midi_control_protocol.cc

@@ -25,6 +25,7 @@
 
 #include <sstream>
 #include <algorithm>
+#include <regex>
 
 #ifdef COMPILER_MSVC
 #include <io.h> // Microsoft's nearest equivalent to <unistd.h>
@@ -1029,24 +1030,13 @@ GenericMidiControlProtocol::lookup_controllable (const string & str, MIDIControl
 	int id = 1;
 	string name;
 
-	static regex_t compiled_pattern;
-	static bool compiled = false;
-
-	if (!compiled) {
-		const char * const pattern = "^[BS]?[0-9]+";
-		/* this pattern compilation is not going to fail */
-		regcomp (&compiled_pattern, pattern, REG_EXTENDED|REG_NOSUB);
-		/* leak compiled pattern */
-		compiled = true;
-	}
-
 	/* Step 3: identify what "rest" looks like - name, or simple nueric, or
 	 * banked/selection specifier
 	 */
 
-	bool matched = (regexec (&compiled_pattern, rest[0].c_str(), 0, 0, 0) == 0);
+	static const std::regex pattern ("^[BS]?[0-9]+", std::regex::extended);
 
-	if (matched) {
+	if (std::regex_search (rest[0], pattern)) {
 		bool banked = false;
 
 		if (rest[0][0] == 'B') {