Make sure calls to dirname that modify the string passed in aren't trying to modify read-only memory

dir.c

@@ -3,20 +3,27 @@
 #include <sys/stat.h>
 #include <libgen.h>
 #include <string.h>
+#include <stdlib.h>
 
-void mkdir_p( char* buffer, int mode )
+void mkdir_p_inside( char* buffer, int mode )
 {
 	if( !*buffer || buffer[1] == '/' ) { return; }
 
 	struct stat s = {0};
 	dirname(buffer);
 	if( -1 == stat(buffer,&s) ) {
-		mkdir_p( buffer, mode );
+		mkdir_p_inside( buffer, mode );
 	}
 
 	buffer[strlen(buffer)] = '/';
 	mkdir( buffer, mode );
 }
+void mkdir_p( char* buffer, int mode )
+{
+	char* copy = strdup(buffer);
+	mkdir_p_inside(copy,mode);
+	free(copy);
+}
 void util_dir_create_containing( const char* buffer, int mode )
 {
 	int size = strlen(buffer);