Added a bunch of new file natives.

Fixed possible corruption in snprintf when input buffer was bigger than output buffer and relaying on its retval.
Fixed all cases when the above situation happened.
Fixed _PrintToHL2Log not taking va_list in.

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40279

plugins/include/files.inc

@@ -18,6 +18,10 @@ enum FileType
 
 #define PLATFORM_MAX_PATH		256
 
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
 /**
  * @brief Opens a directory/folder for contents enumeration.
  * @note Directories are closed with CloseHandle().
@@ -41,3 +45,111 @@ native Handle:OpenDirectory(const String:path[]);
  * @error				Invalid or corrupt Handle. 
  */
 native bool:ReadDirEntry(Handle:dir, String:buffer[], maxlength, &FileType:type=FileType_Unknown);
+
+/**
+ * @brief Opens a file.
+ * @note Files are closed with CloseHandle().
+ * @note File Handles can be cloned.
+ *
+ * @param file			File to open.
+ * @param mode			Open mode.
+ * @return			A Handle to the file, INVALID_HANDLE on open error.
+ */
+native Handle:OpenFile(const String:file[], const String:mode[]);
+
+/**
+ * @brief Deletes a file.
+ *
+ * @param path			Path of the file to delete.
+ * @return			True on success, false otherwise.
+ */
+native bool:DeleteFile(const String:path[]);
+
+/**
+ * @brief Reads a line from a text file.
+ *
+ * @param hndl			Handle to the file.
+ * @param buffer		String buffer to hold the line.
+ * @param maxlength		Maximum size of string buffer.	
+ * @return			True on success, false otherwise.
+ */
+native bool:ReadFileLine(Handle:hndl, String:buffer[], maxlength);
+
+/**
+ * @brief Tests if the end of file has been reached.
+ *
+ * @param file			Handle to the file.
+ * @return			True if end of file has been reached, false otherwise.
+ */
+native bool:IsEndOfFile(Handle:file);
+
+/**
+ * @brief Sets the file position indicator.
+ *
+ * @param file			Handle to the file.
+ * @param position		Position relative to what is specified in whence.
+ * @param whence		Look at the SEEK_* definitions.
+ * @return			True on success, false otherwise.
+ */
+native bool:FileSeek(Handle:file, position, whence);
+
+/**
+ * @brief Get current position in the file.
+ *
+ * @param file			Handle to the file.
+ * @return			Value for the file position indicator.
+ */
+native FilePosition(Handle:file);
+
+/**
+ * @brief Checks if a file exists.
+ *
+ * @param path			Path to the file.
+ * @return			True if the file exists, false otherwise.
+ */
+native bool:FileExists(const String:path[]);
+
+/**
+ * @brief Renames a file.
+ *
+ * @param newpath		New path to the file.
+ * @param oldpath		Path to the existing file.
+ * @return			True on success, false otherwise.
+ */
+native bool:RenameFile(const String:newpath[], const String:oldpath[]);
+
+/**
+ * @brief Checks if a directory exists.
+ *
+ * @param path			Path to the directory.
+ * @return			True if the directory exists, false otherwise.
+ */
+native bool:DirExists(const String:path[]);
+
+/**
+ * @brief Get the file size in bytes.
+ *
+ * @param path			Path to the file.
+ * @return			File size in bytes, -1 if file not found.
+ */
+native FileSize(const String:path[]);
+
+/**
+ * @brief Removes a directory.
+ * @note On most Operating Systems you cannot remove a directory which has files inside it.
+ *
+ * @param path			Path to the directory.
+ * @return			True on success, false otherwise.
+ */
+native bool:RemoveDir(const String:path[]);
+
+/**
+ * @brief Writes a line of text in a file.
+ * @note This native will append the newline character.
+ *
+ * @param hndl			Handle to the file.
+ * @param format		Formatting rules.
+ * @param ...			Variable number of format parameters.
+ * @return			True on success, false otherwise.
+ */
+native bool:WriteFileLine(Handle:hndl, const String:format[], ...);