//----------------------------------------------------------------------
//
// FsClose
//
// Close an open file. Call the FS-specific routine, and then mark
// the file table entry unused.
//
//----------------------------------------------------------------------
int
FsClose (int fd)
{
int retval;
if (!FdValid (fd)) {
return (-1);
}
retval = fs[openfiles[fd].fs].Close (fd);
FsFreeEntry (fd);
return (retval);
}
//----------------------------------------------------------------------
//
// FsOpen
//
// Open a file. The name of the file is passed, along with the file
// mode (read or write).
//
// This function figures out which file system is desired using a
// simple heuristic. Basically, if the file starts with "dlx:", it's
// a DLX file system file. Otherwise, it's a UNIX file.
//
// Once the file system is figured out, this routine allocates a
// file descriptor and calls the file-system specific open routine.
//
//----------------------------------------------------------------------
int
FsOpen (const char *name, int mode)
{
int i, retval;
dbprintf ('f', "Attepmting to open %s mode=%d.\n", name, mode);
/* printf ("Attepmting to open %s mode=%d.\n", name, mode); */
// Mask off all but the mode bits
mode &= FS_MODE_RW;
// ERROR if the caller hasn't specified a file mode.
if (mode == 0) {
printf("FsOpen: file mode unspecified!\n");
return (-1);
}
for (i = 0; i < FS_MAX_OPEN_FILES; i++) {
if (openfiles[i].flags == 0) {
break;
}
}
if (i >= FS_MAX_OPEN_FILES) {
printf("FsOpen: no available open file structures!\n");
return (-1);
}
openfiles[i].flags = mode;
// If file name starts with "dlx:", it's a DLX file system file. Pass
// the remainder of the file name to FsDlxOpen.
if (!dstrncmp (name, "dlx:", 4)) {
name += 4; // Skip past the "dlx:"
openfiles[i].fs = 1;
} else {
openfiles[i].fs = 0;
}
dbprintf ('f', "File %s opening in file system %d.\n",name,openfiles[i].fs);
/* printf ("File %s opening in file system %d.\n",name,openfiles[i].fs); */
retval = fs[openfiles[i].fs].Open (i, name, mode);
if (retval < 0) {
// Open failed, so return error code
printf("FsOpen: failed to open file with Open function pointer\n");
FsFreeEntry (i);
return (retval);
}
dbprintf ('f', "Opened %s in FS %d, mode=%d slot=%d.\n", name,
openfiles[i].fs, mode, i);
return (i);
}
