From 5bcc54e0219c8a177e6bdcdcbcf2e097d3eb0d3d Mon Sep 17 00:00:00 2001
From: peter1138 <peter1138@openttd.org>
Date: Wed, 29 Mar 2017 17:36:46 +0000
Subject: [PATCH] (svn r27834) -Change: Parse extmidi command string for
 parameters to pass on.

---
 src/music/extmidi.cpp | 36 +++++++++++++++++++++++++++++-------
 src/music/extmidi.h   |  2 +-
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/src/music/extmidi.cpp b/src/music/extmidi.cpp
index f4a35360c0..12b3689e2a 100644
--- a/src/music/extmidi.cpp
+++ b/src/music/extmidi.cpp
@@ -12,6 +12,7 @@
 #include "../stdafx.h"
 #include "../debug.h"
 #include "../string_func.h"
+#include "../core/alloc_func.hpp"
 #include "../sound/sound_driver.hpp"
 #include "../video/video_driver.hpp"
 #include "../gfx_func.h"
@@ -42,9 +43,33 @@ const char *MusicDriver_ExtMidi::Start(const char * const * parm)
 	}
 
 	const char *command = GetDriverParam(parm, "cmd");
+#ifndef MIDI_ARG
 	if (StrEmpty(command)) command = EXTERNAL_PLAYER;
+#else
+	if (StrEmpty(command)) command = EXTERNAL_PLAYER " " MIDI_ARG;
+#endif
+
+	/* Count number of arguments, but include 3 extra slots: 1st for command, 2nd for song title, and 3rd for terminating NULL. */
+	uint num_args = 3;
+	for (const char *t = command; *t != '\0'; t++) if (*t == ' ') num_args++;
+
+	this->params = CallocT<char *>(num_args);
+	this->params[0] = stredup(command);
+
+	/* Replace space with \0 and add next arg to params */
+	uint p = 1;
+	while (true) {
+		this->params[p] = strchr(this->params[p - 1], ' ');
+		if (this->params[p] == NULL) break;
+
+		this->params[p][0] = '\0';
+		this->params[p]++;
+		p++;
+	}
+
+	/* Last parameter is the song file. */
+	this->params[p] = this->song;
 
-	this->command = stredup(command);
 	this->song[0] = '\0';
 	this->pid = -1;
 	return NULL;
@@ -52,7 +77,8 @@ const char *MusicDriver_ExtMidi::Start(const char * const * parm)
 
 void MusicDriver_ExtMidi::Stop()
 {
-	free(command);
+	free(params[0]);
+	free(params);
 	this->song[0] = '\0';
 	this->DoStop();
 }
@@ -91,11 +117,7 @@ void MusicDriver_ExtMidi::DoPlay()
 			close(0);
 			int d = open("/dev/null", O_RDONLY);
 			if (d != -1 && dup2(d, 1) != -1 && dup2(d, 2) != -1) {
-				#if defined(MIDI_ARG)
-					execlp(this->command, "extmidi", MIDI_ARG, this->song, (char*)0);
-				#else
-					execlp(this->command, "extmidi", this->song, (char*)0);
-				#endif
+				execvp(this->params[0], this->params);
 			}
 			_exit(1);
 		}
diff --git a/src/music/extmidi.h b/src/music/extmidi.h
index c6a9e08f8d..cfbd894596 100644
--- a/src/music/extmidi.h
+++ b/src/music/extmidi.h
@@ -16,7 +16,7 @@
 
 class MusicDriver_ExtMidi : public MusicDriver {
 private:
-	char *command;
+	char **params;
 	char song[MAX_PATH];
 	pid_t pid;