| 335 |
|
|
| 336 |
|
|
| 337 |
|
int |
| 338 |
< |
hdgetbi(hp, i) /* allocate a file fragment */ |
| 338 |
> |
hdsyncbi(hp, i) /* sync beam in memory with beam on disk */ |
| 339 |
|
register HOLO *hp; |
| 340 |
|
register int i; |
| 341 |
|
{ |
| 342 |
< |
int nrays = hp->bl[i]->nrm; |
| 343 |
< |
|
| 344 |
< |
if (hp->bi[i].nrd == nrays) /* current one will do? */ |
| 342 |
> |
unsigned int nrays = hp->bl[i]->nrm; |
| 343 |
> |
long nfo; |
| 344 |
> |
unsigned int n; |
| 345 |
> |
/* is current fragment OK? */ |
| 346 |
> |
if (nrays == hp->bi[i].nrd) |
| 347 |
|
return(0); |
| 348 |
+ |
/* check file status */ |
| 349 |
+ |
if (hp->dirty < 0) |
| 350 |
+ |
return(-1); |
| 351 |
|
|
| 352 |
|
if (hp->fd >= nhdfrags || !hdfrag[hp->fd].nlinks) /* untracked */ |
| 353 |
|
hp->bi[i].fo = lseek(hp->fd, 0L, 2); |
| 354 |
|
|
| 355 |
|
else if (hp->bi[i].fo + hp->bi[i].nrd*sizeof(RAYVAL) == |
| 356 |
|
hdfrag[hp->fd].flen) /* EOF special case */ |
| 357 |
< |
hdfrag[hp->fd].flen = hp->bi[i].fo + nrays*sizeof(RAYVAL); |
| 357 |
> |
hdfrag[hp->fd].flen = (nfo=hp->bi[i].fo) + nrays*sizeof(RAYVAL); |
| 358 |
|
|
| 359 |
|
else { /* general case */ |
| 360 |
|
register struct fragment *f = &hdfrag[hp->fd]; |
| 375 |
|
(j+FRAGBLK)*sizeof(BEAMI)); |
| 376 |
|
if (f->fi == NULL) |
| 377 |
|
error(SYSTEM, |
| 378 |
< |
"out of memory in hdgetbi"); |
| 378 |
> |
"out of memory in hdsyncbi"); |
| 379 |
|
} |
| 380 |
|
for ( ; ; j--) { /* insert in descending list */ |
| 381 |
|
if (!j || hp->bi[i].fo < f->fi[j-1].fo) { |
| 400 |
|
f->nfrags = j; |
| 401 |
|
} |
| 402 |
|
k = -1; /* find closest-sized fragment */ |
| 403 |
< |
for (j = f->nfrags; j-- > 0; ) |
| 403 |
> |
for (j = nrays ? f->nfrags : 0; j-- > 0; ) |
| 404 |
|
if (f->fi[j].nrd >= nrays && |
| 405 |
|
(k < 0 || f->fi[j].nrd < f->fi[k].nrd)) |
| 406 |
|
if (f->fi[k=j].nrd == nrays) |
| 407 |
|
break; |
| 408 |
|
if (k < 0) { /* no fragment -- extend file */ |
| 409 |
< |
hp->bi[i].fo = f->flen; |
| 409 |
> |
nfo = f->flen; |
| 410 |
|
f->flen += nrays*sizeof(RAYVAL); |
| 411 |
|
} else { /* else use fragment */ |
| 412 |
< |
hp->bi[i].fo = f->fi[k].fo; |
| 412 |
> |
nfo = f->fi[k].fo; |
| 413 |
|
if (f->fi[k].nrd == nrays) { /* delete fragment */ |
| 414 |
|
f->nfrags--; |
| 415 |
|
for (j = k; j < f->nfrags; j++) |
| 420 |
|
} |
| 421 |
|
} |
| 422 |
|
} |
| 423 |
+ |
if (nrays) { /* write the new fragment */ |
| 424 |
+ |
errno = 0; |
| 425 |
+ |
if (lseek(hp->fd, nfo, 0) < 0) |
| 426 |
+ |
error(SYSTEM, "cannot seek on holodeck file"); |
| 427 |
+ |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
| 428 |
+ |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
| 429 |
+ |
hp->dirty = -1; /* avoid recursive error */ |
| 430 |
+ |
error(SYSTEM, "write error in hdsyncbi"); |
| 431 |
+ |
} |
| 432 |
+ |
} |
| 433 |
|
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
| 434 |
|
hp->bi[i].nrd = nrays; |
| 435 |
+ |
hp->bi[i].fo = nfo; |
| 436 |
|
markdirty(hp); /* section directory now out of date */ |
| 437 |
|
return(1); |
| 438 |
|
} |
| 443 |
|
register HOLO *hp; |
| 444 |
|
register int i; |
| 445 |
|
{ |
| 446 |
< |
int nchanged, n; |
| 446 |
> |
int nchanged; |
| 447 |
|
|
| 448 |
|
if (hp == NULL) { /* clear all holodecks */ |
| 449 |
|
nchanged = 0; |
| 451 |
|
nchanged += hdfreebeam(hdlist[i], 0); |
| 452 |
|
return(nchanged); |
| 453 |
|
} |
| 438 |
– |
if (hp->fd < 0) /* check for recursive error */ |
| 439 |
– |
return(-1); |
| 454 |
|
if (i == 0) { /* clear entire holodeck */ |
| 455 |
|
nchanged = 0; |
| 456 |
|
for (i = nbeams(hp); i > 0; i--) |
| 464 |
|
return(0); |
| 465 |
|
/* check for additions */ |
| 466 |
|
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
| 467 |
< |
if (nchanged) { |
| 468 |
< |
hdgetbi(hp, i); /* allocate a file position */ |
| 455 |
< |
errno = 0; |
| 456 |
< |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
| 457 |
< |
error(SYSTEM, "cannot seek on holodeck file"); |
| 458 |
< |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
| 459 |
< |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
| 460 |
< |
hp->fd = -1; /* avoid recursive error */ |
| 461 |
< |
error(SYSTEM, "write error in hdfreebeam"); |
| 462 |
< |
} |
| 463 |
< |
} |
| 467 |
> |
if (nchanged) |
| 468 |
> |
hdsyncbi(hp, i); /* write new fragment */ |
| 469 |
|
blglob(hp)->nrm -= hp->bl[i]->nrm; |
| 470 |
|
free((char *)hp->bl[i]); /* free memory */ |
| 471 |
|
hp->bl[i] = NULL; |
| 479 |
|
register int i; |
| 480 |
|
{ |
| 481 |
|
static BEAM emptybeam; |
| 482 |
< |
int nchanged, n; |
| 482 |
> |
int nchanged; |
| 483 |
|
|
| 484 |
|
if (hp == NULL) { /* clobber all holodecks */ |
| 485 |
|
nchanged = 0; |
| 507 |
|
nchanged = hp->bi[i].nrd; |
| 508 |
|
if (hp->bi[i].nrd) { /* free file fragment */ |
| 509 |
|
hp->bl[i] = &emptybeam; |
| 510 |
< |
hdgetbi(hp, i); |
| 510 |
> |
hdsyncbi(hp, i); |
| 511 |
|
} |
| 512 |
|
hp->bl[i] = NULL; |
| 513 |
|
return(nchanged); |
