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); |