- int osmode = 0;
- if ( mode & _PDCLIB_FRW ) osmode |= O_RDWR;
- if ( mode & ( _PDCLIB_FWRITE | _PDCLIB_FAPPEND ) ) osmode |= O_CREAT;
- if ( mode & _PDCLIB_FWRITE ) osmode |= O_TRUNC;
- if ( mode & _PDCLIB_FAPPEND ) osmode |= O_APPEND;
- if ( ( mode & _PDCLIB_FREAD ) && ! ( mode & _PDCLIB_FRW ) ) osmode |= O_RDONLY;
- return open( filename, osmode );
+ /* FIXME: THIS IS NOT TO BE USED OUT-OF-THE-BOX.
+ It is a proof-of-concept implementation. E.g. a stream may only be fully
+ buffered IF IT CAN BE DETERMINED NOT TO REFER TO AN INTERACTIVE DEVICE.
+ This logic is not represented here, as this is the EXAMPLE platform, and
+ actual platform overlays may differ widely. Another point is the value
+ for permissions being hardcoded to 0664 for file creations.
+ */
+ int osmode;
+ switch ( mode & ~_PDCLIB_FBIN )
+ {
+ case _PDCLIB_FREAD: /* "r" */
+ osmode = O_RDONLY;
+ break;
+ case _PDCLIB_FWRITE: /* "w" */
+ osmode = O_WRONLY | O_CREAT | O_TRUNC;
+ break;
+ case _PDCLIB_FAPPEND: /* "a" */
+ osmode = O_APPEND | O_CREAT;
+ break;
+ case _PDCLIB_FREAD | _PDCLIB_FRW: /* "r+" */
+ osmode = O_RDWR;
+ break;
+ case _PDCLIB_FWRITE | _PDCLIB_FRW: /* "w+" */
+ osmode = O_RDWR | O_CREAT | O_TRUNC;
+ break;
+ case _PDCLIB_FAPPEND | _PDCLIB_FRW: /* "a+" */
+ osmode = O_RDWR | O_APPEND | O_CREAT;
+ break;
+ default: /* Invalid mode */
+ return -1;
+ }
+ if ( osmode & O_CREAT )
+ {
+ return open( filename, osmode, S_IRUSR | S_IWUSR );
+ }
+ else
+ {
+ return open( filename, osmode );
+ }