file: Don't use throw / catch to report errors

Needing to use throw / catch was getting in the way.  Instead, check for
a boolean return value.

Signed-off-by: Anna Schumaker <schumaker.anna@gmail.com>

DESIGN

@@ -42,8 +42,6 @@ Error Codes:
 		E_AUDIO = 1,	/* Audio error */
 		E_EXIST,	/* Requested object does not exist */
 		E_INVAL,	/* Invalid operation requested */
-		E_IO,		/* I/O error */
-		E_NOTRACK,	/* Track ID not found */
 	};
 
 
@@ -165,19 +163,23 @@ On-disk files:
 		Return true if the file exists in the filesystem.
 		Return false otherwise.
 
-	void File :: open(OpenMode mode);
+	bool File :: open(OpenMode mode);
+		Return false if:
+			- hint == FILE_TYPE_INVALID
+			- mode == NOT_OPEN
+			- The file is already open
+
 		When opening a file for reading (mode == OPEN_READ),
-			- Throw -EEXIST if the file does not exist
+			- Return false if the file does not exist
 			- Open the file
 			- Read in version from the start of the file
 
 		When opening a file for writing (mode == OPEN_WRITE),
-			- Throw -ELEGACY if the file has FILE_TYPE_LEGACY set
+			- Return false if the file has FILE_TYPE_LEGACY set
 			- Create missing directories as needed
 			- Write version information to the start of the file
 
-		Throw -EINVAL if hint == FILE_TYPE_INVALID.
-		Throw -EOPEN if the file is already open.
+		Return true on success.
 
 	void File :: close();
 		Close a file after IO.

include/error.h

@@ -8,8 +8,6 @@ enum o_error {
 	E_AUDIO = 1,	/* Audio error */
 	E_EXIST,	/* Requested object does not exist */
 	E_INVAL,	/* Invalid operation requested */
-	E_IO,		/* I/O error */
-	E_NOTRACK,	/* Track ID not found */
 };
 
 #endif /* OCARINA_ERROR_H */

include/file.h

@@ -29,8 +29,8 @@ private:
 	unsigned int version;
 
 	std::string find_dir();
-	void open_read();
-	void open_write();
+	bool open_read();
+	bool open_write();
 
 public:
 	File(const std::string &, FileLocHint);
@@ -38,7 +38,7 @@ public:
 	const char *get_filepath();
 	const unsigned int get_version();
 	bool exists();
-	void open(OpenMode);
+	bool open(OpenMode);
 	void close();
 	std::string getline();
 };

lib/file.cpp

@@ -65,64 +65,66 @@ std::string File :: find_dir()
 	return res;
 }
 
-void File :: open_read()
+bool File :: open_read()
 {
 	if (!exists()) {
 		dprint("ERROR: File does not exist\n");
-		throw -E_EXIST;
+		return false;
 	}
 
 	std::fstream::open(filepath.c_str(), std::fstream::in);
 	if (std::fstream::fail()) {
 		dprint("ERROR: File could not be opened for reading\n");
-		throw -E_IO;
+		return false;
 	}
 
 	mode = OPEN_READ;
 	std::fstream::operator>>(version);
 	getline();
+	return true;
 }
 
-void File :: open_write()
+bool File :: open_write()
 {
 	if (hint == FILE_TYPE_LEGACY) {
 		dprint("ERROR: Cannot write to legacy files\n");
-		throw -E_IO;
+		return false;
 	}
 
 	std::string dir = find_dir();
 	if (g_mkdir_with_parents(dir.c_str(), 0755) != 0) {
 		dprint("ERROR: Could not make directory\n");
-		throw -E_IO;
+		return false;
 	}
 
 	std::fstream::open(filepath.c_str(), std::fstream::out);
 	if (std::fstream::fail()) {
 		dprint("ERROR: Could not open file for writing\n");
-		throw -E_IO;
+		return false;
 	}
 
 	mode = OPEN_WRITE;
 	std::fstream::operator<<(FILE_VERSION) << std::endl;
+	return true;
 }
 
-void File :: open(OpenMode m)
+bool File :: open(OpenMode m)
 {
 	if (hint == FILE_TYPE_INVALID) {
 		dprint("ERROR: A file with hint = FILE_TYPE_INVALID cannot be opened\n");
-		throw -E_INVAL;
+		return false;
 	} else if (m == NOT_OPEN) {
 		dprint("ERROR: NOT_OPEN is not a legal OpenMode\n");
-		throw -E_INVAL;
+		return false;
 	} else if (mode != NOT_OPEN) {
 		dprint("ERROR: File is already open\n");
-		throw -E_IO;
+		return false;
 	}
 
 	else if (m == OPEN_READ)
-		open_read();
+		return open_read();
 	else /* m == OPEN_WRITE */
-		open_write();
+		return open_write();
 }
 
 void File :: close()

tests/src/file.cpp

@@ -37,12 +37,9 @@ int print_filepath(File &f)
 
 int open_file(File &f, OpenMode mode)
 {
-	try {
-		f.open(mode);
+	if (f.open(mode) == true)
 		return 0;
-	} catch (int err) {
-		return err;
-	}
+	return 1;
 }
 
 int main(int argc, char **argv)