- * \param mode points to a string beginning with one of the following sequences (Additional characters may follow these sequences.):
- * r Open text file for reading. The stream is positioned at the beginning of the file.
- * r+ Open for reading and writing. The stream is positioned at the beginning of the file.
- * w Truncate file to zero length or create text file for writing. The stream is positioned at the beginning of the file.
- * w+ Open for reading and writing. The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the
- * beginning of the file.
- * a Open for appending (writing at end of file). The file is created if it does not exist. The stream is positioned at the end of the file.
- * a+ Open for reading and appending (writing at end of file). The file is created if it does not exist. The initial file position for reading
- * is at the beginning of the file, but output is always appended to the end of the file.