Function cfile::open [−] [src]

pub fn open<P: AsRef<Path>>(path: P, mode: &str) -> Result<CFile>

opens the file whose name is the string pointed to by filename and associates a stream with it.

The argument mode points to a string beginning with one of the following sequences (Additional characters may follow these sequences.)

Modes

  • 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 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 writing. The file is created if it does not exist. The stream is positioned at the end of the file. Subsequent writes to the file will always end up at the then current end of file, irrespective of any intervening fseek(3) or similar.

  • a+ Open for reading and writing. The file is created if it does not exist. The stream is positioned at the end of the file. Subse- quent writes to the file will always end up at the then current end of file, irrespective of any intervening fseek(3) or similar.

The mode string can also include the letter b either as last charac- ter or as a character between the characters in any of the two-character strings described above. This is strictly for compatibility with ISO/IEC 9899:1990 (ISO C90) and has no effect; the b is ignored.