[En-Nut-Discussion] fmode update

[Ralph Mason]

I have made the following change to fmode so it gives the flags to create or
truncate a file.

I would like to submit it as part of the general code base.

Regards
Ralph

/*! \internal
 * \brief Return the flags for a given mode string.
 *
 * \return Flags or EOF to indicate an error.
 */
int _fmode(CONST char *mode)
{
    int mflags = _O_TEXT;

    switch (*mode) {
    case 'r':
        mflags |= _O_RDONLY;
        break;
    case 'w':
        mflags |= _O_WRONLY | _O_CREAT |_O_TRUNC ;
        break;
    case 'a':
        mflags |= _O_APPEND | _O_CREAT;
        break;
    default:
        errno = EINVAL;
        return EOF;
    }
    while (*++mode) {
        switch (*mode) {
        case '+':
            mflags &= ~(_O_RDONLY | _O_WRONLY);
            mflags |= _O_RDWR;
            break;
        case 'b':
            mflags &= ~_O_TEXT;
            mflags |= _O_BINARY;
            break;
        default:
            errno = EINVAL;
            return EOF;
        }
    }
    return mflags;
}
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