libsaria: Check if a song exists before loading it

This could lead to a segmentation fault if we don't do it...

Signed-off-by: Bryan Schumaker <bjschuma@gmail.com>

Sconstruct

@@ -3,7 +3,7 @@ import sys
 
 MAJOR = 5
 MINOR = 5
-BUG   = 1
+BUG   = 2
 EXTRA = ""
 DEBUG = False
 

include/libsaria/path.h

@@ -17,6 +17,7 @@ struct file
 
 string get_saria_dir();
 void make_saria_dir();
+bool exists(string);
 sid_t lookup_songid(string &);
 
 #endif /* LIBSARIA_PATH_H */

include/libsaria/path.h.orig

@@ -0,0 +1,22 @@
+#ifndef LIBSARIA_PATH_H
+#define LIBSARIA_PATH_H
+
+#include <libsaria/track.h>
+
+#include <string>
+#include <list>
+using namespace std;
+
+#include <sys/types.h>
+
+struct file
+{
+	string name;
+	sid_t  d_sid;
+};
+
+string get_saria_dir();
+void make_saria_dir();
+sid_t lookup_songid(string &);
+
+#endif /* LIBSARIA_PATH_H */

libsaria/audio/controls.cpp

@@ -2,6 +2,7 @@
 #include <libsaria/audio.h>
 #include <libsaria/callback.h>
 #include <libsaria/print.h>
+#include <libsaria/path.h>
 #include "audio.h"
 
 static string cur_file;
@@ -30,7 +31,7 @@ static void reset()
 
 void load_file(GstElement *playbin, string file)
 {
-	if (file == "")
+	if (file == "" || !exists(file))
 		return;
 	string uri = "file://" + file;
 	println("Loading uri: " + uri);

libsaria/path/dir.cpp

@@ -40,6 +40,12 @@ void make_saria_dir()
 	mkdir(saria.c_str(), mode);
 }
 
+bool exists(string path)
+{
+	struct stat stat;
+	return lstat(path.c_str(), &stat) == 0;
+}
+
 sid_t lookup_songid(string &filepath)
 {
 	struct stat stat;

libsaria/path/dir.cpp.orig

@@ -0,0 +1,50 @@
+
+#include <dirent.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <libsaria/path.h>
+
+#include <iostream>
+using namespace std;
+
+/* I want to use the d_type field in a dirent */
+#ifndef __USE_BSD
+#define __USE_BSD
+#endif
+
+#ifdef DEBUG
+	static string SARIA_DIR = "/saria-debug";
+#else /* DEBUG */
+	static string SARIA_DIR = "/saria";
+#endif /* DEBUG */
+
+string get_saria_dir()
+{
+	string saria = getenv("HOME");
+	string xdg   = getenv("XDG_CONFIG_HOME");
+
+	if (xdg == "")
+		saria += "/.config";
+	else if (xdg.compare(0, saria.size(), saria) == 0)
+		saria = xdg + "/";
+	else
+		saria += "/" + xdg += "/";
+
+	return saria += SARIA_DIR;
+}
+
+void make_saria_dir()
+{
+	string saria = get_saria_dir();
+	mode_t mode  = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
+	mkdir(saria.c_str(), mode);
+}
+
+sid_t lookup_songid(string &filepath)
+{
+	struct stat stat;
+	int err = lstat(filepath.c_str(), &stat);
+	if (err != 0)
+		return err;
+	return stat.st_ino;
+}