pass constant pointers

And again, convert arguments to const.

src/audio.c

@@ -419,7 +419,7 @@ void closeAudioDevice(void)
 	audioOpened = 0;
 }
 
-void sendMetadataToAudioDevice(MpdTag * tag)
+void sendMetadataToAudioDevice(const MpdTag * tag)
 {
 	unsigned int i;
 

src/audio.h

@@ -55,7 +55,7 @@ int isAudioDeviceOpen(void);
 
 int isCurrentAudioFormat(const AudioFormat * audioFormat);
 
-void sendMetadataToAudioDevice(MpdTag * tag);
+void sendMetadataToAudioDevice(const MpdTag * tag);
 
 /* these functions are called in the main parent process while the child
 	process is busy playing to the audio */

src/audioOutput.c

@@ -244,7 +244,7 @@ void finishAudioOutput(AudioOutput * audioOutput)
 		free(audioOutput->convBuffer);
 }
 
-void sendMetadataToAudioOutput(AudioOutput * audioOutput, MpdTag * tag)
+void sendMetadataToAudioOutput(AudioOutput * audioOutput, const MpdTag * tag)
 {
 	if (!audioOutput->sendMetdataFunc)
 		return;

src/audioOutput.h

@@ -50,7 +50,7 @@ typedef void (*AudioOutputDropBufferedAudioFunc) (AudioOutput * audioOutput);
 typedef void (*AudioOutputCloseDeviceFunc) (AudioOutput * audioOutput);
 
 typedef void (*AudioOutputSendMetadataFunc) (AudioOutput * audioOutput,
-					     MpdTag * tag);
+					     const MpdTag * tag);
 
 struct _AudioOutput {
 	int open;
@@ -104,7 +104,7 @@ void dropBufferedAudioOutput(AudioOutput * audioOutput);
 void closeAudioOutput(AudioOutput * audioOutput);
 void finishAudioOutput(AudioOutput * audioOutput);
 int keepAudioOutputAlive(AudioOutput * audioOutput, int ms);
-void sendMetadataToAudioOutput(AudioOutput * audioOutput, MpdTag * tag);
+void sendMetadataToAudioOutput(AudioOutput * audioOutput, const MpdTag * tag);
 
 void printAllOutputPluginTypes(FILE * fp);
 

src/ls.c

@@ -42,10 +42,10 @@ int printRemoteUrlHandlers(int fd)
 	return 0;
 }
 
-int isValidRemoteUtf8Url(char *utf8url)
+int isValidRemoteUtf8Url(const char *utf8url)
 {
 	int ret = 0;
-	char *temp;
+	const char *temp;
 
 	switch (isRemoteUrl(utf8url)) {
 	case 1:
@@ -82,7 +82,7 @@ int isValidRemoteUtf8Url(char *utf8url)
 	return ret;
 }
 
-int isRemoteUrl(char *url)
+int isRemoteUrl(const char *url)
 {
 	int count = 0;
 	const char **urlPrefixes = remoteUrlPrefixes;

src/ls.h

@@ -25,9 +25,9 @@ int lsPlaylists(int fd, const char *utf8path);
 
 const char *getSuffix(const char *utf8file);
 
-int isValidRemoteUtf8Url(char *utf8url);
+int isValidRemoteUtf8Url(const char *utf8url);
 
-int isRemoteUrl(char *url);
+int isRemoteUrl(const char *url);
 
 int myStat(const char *utf8file, struct stat *st);
 

src/tagTracker.c

@@ -106,7 +106,7 @@ void resetVisitedFlagsInTagTracker(int type)
 	}
 }
 
-void visitInTagTracker(int type, char *str)
+void visitInTagTracker(int type, const char *str)
 {
 	TreeIterator iter;
 

src/tagTracker.h

@@ -29,7 +29,7 @@ void printMemorySavedByTagTracker(void);
 
 void resetVisitedFlagsInTagTracker(int type);
 
-void visitInTagTracker(int type, char *str);
+void visitInTagTracker(int type, const char *str);
 
 void printVisitedInTagTracker(int fd, int type);
 

src/tree.c

@@ -71,7 +71,7 @@ _ClearKeyData(TreeKeyData * keyData)
 
 static
 int
-_FindPosition(Tree * tree, TreeNode * node, void * key, int * pos)
+_FindPosition(Tree * tree, TreeNode * node, const void * key, int * pos)
 {
 #ifdef USE_BINARY_SEARCH
 	int low = 0;
@@ -113,7 +113,7 @@ _FindPosition(Tree * tree, TreeNode * node, void * key, int * pos)
 
 static
 int
-_Find(TreeIterator * iter, void * key)
+_Find(TreeIterator * iter, const void * key)
 {
 	while (1)
 	{
@@ -680,7 +680,7 @@ RemoveFromTreeByIterator(Tree * tree, TreeIterator * iter)
 }
 
 int
-FindInTree(Tree * tree, void * key, TreeIterator * iter)
+FindInTree(Tree * tree, const void * key, TreeIterator * iter)
 {
 	TreeIterator i;
 	

src/tree.h

@@ -57,6 +57,7 @@ int InsertInTree(Tree * tree, void * key, void * data);
 int RemoveFromTreeByKey(Tree * tree, void * key);
 void RemoveFromTreeByIterator(Tree * tree, TreeIterator * iter);
 
-int FindInTree(Tree * tree, void * key, TreeIterator * iter /* can be NULL */);
+int FindInTree(Tree * tree, const void * key,
+	       TreeIterator * iter /* can be NULL */);
 
 #endif