| 35 |
|
|
| 36 |
|
static AMBTREE atrunk; /* our ambient trunk node */ |
| 37 |
|
|
| 38 |
– |
static char *ambfname = NULL; /* ambient file name */ |
| 38 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
| 39 |
+ |
static int nunflshed = 0; /* number of unflushed ambient values */ |
| 40 |
|
|
| 41 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
| 42 |
|
|
| 45 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
| 46 |
|
|
| 47 |
|
extern long ftell(), lseek(); |
| 48 |
< |
static int initambfile(), avsave(), avinsert(), ambsync(); |
| 48 |
> |
static int initambfile(), avsave(), avinsert(); |
| 49 |
|
|
| 50 |
|
|
| 51 |
|
setambres(ar) /* set ambient resolution */ |
| 74 |
|
/* init ambient limits */ |
| 75 |
|
setambres(ambres); |
| 76 |
|
/* open ambient file */ |
| 77 |
< |
if ((ambfname = afile) != NULL) |
| 77 |
> |
if (afile != NULL) { |
| 78 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 79 |
|
initambfile(0); |
| 80 |
|
headlen = ftell(ambfp); |
| 90 |
|
afile); |
| 91 |
|
error(SYSTEM, errmsg); |
| 92 |
|
} |
| 93 |
+ |
nunflshed++; /* lie */ |
| 94 |
+ |
ambsync(); |
| 95 |
+ |
} |
| 96 |
|
} |
| 97 |
|
|
| 98 |
|
|
| 326 |
|
putambmagic(ambfp); |
| 327 |
|
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 328 |
|
error(USER, "bad ambient file"); |
| 326 |
– |
ambsync(); |
| 329 |
|
} |
| 330 |
|
|
| 331 |
|
|
| 333 |
|
avsave(av) /* insert and save an ambient value */ |
| 334 |
|
AMBVAL *av; |
| 335 |
|
{ |
| 334 |
– |
static int nunflshed = 0; |
| 335 |
– |
|
| 336 |
|
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
| 337 |
|
if (ambfp == NULL) |
| 338 |
|
return; |
| 339 |
|
if (writambval(av, ambfp) < 0) |
| 340 |
|
goto writerr; |
| 341 |
< |
if (++nunflshed >= AMBFLUSH) { |
| 341 |
> |
if (++nunflshed >= AMBFLUSH) |
| 342 |
|
if (ambsync() == EOF) |
| 343 |
|
goto writerr; |
| 344 |
– |
nunflshed = 0; |
| 345 |
– |
} |
| 344 |
|
return; |
| 345 |
|
writerr: |
| 346 |
|
error(SYSTEM, "error writing ambient file"); |
| 384 |
|
} |
| 385 |
|
|
| 386 |
|
|
| 387 |
< |
#ifdef NIX |
| 387 |
> |
#ifdef F_SETLKW |
| 388 |
|
|
| 389 |
< |
static |
| 392 |
< |
ambsync() /* flush ambient file */ |
| 393 |
< |
{ |
| 394 |
< |
return(fflush(ambfp)); |
| 395 |
< |
} |
| 396 |
< |
|
| 397 |
< |
#else |
| 398 |
< |
|
| 399 |
< |
static |
| 389 |
> |
int |
| 390 |
|
ambsync() /* synchronize ambient file */ |
| 391 |
|
{ |
| 392 |
|
static FILE *ambinp = NULL; |
| 395 |
|
long flen; |
| 396 |
|
AMBVAL avs; |
| 397 |
|
register int n; |
| 398 |
+ |
|
| 399 |
+ |
if (nunflshed == 0) |
| 400 |
+ |
return(0); |
| 401 |
|
/* gain exclusive access */ |
| 402 |
|
fls.l_type = F_WRLCK; |
| 403 |
|
fls.l_whence = 0; |
| 411 |
|
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
| 412 |
|
error(SYSTEM, "cannot seek on ambient file"); |
| 413 |
|
if (n = flen - lastpos) { /* file has grown */ |
| 414 |
< |
if (ambinp == NULL) { |
| 415 |
< |
ambinp = fopen(ambfname, "r"); |
| 414 |
> |
if (ambinp == NULL) { /* use duplicate filedes */ |
| 415 |
> |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
| 416 |
|
if (ambinp == NULL) |
| 417 |
< |
error(SYSTEM, "fopen failed in ambsync"); |
| 417 |
> |
error(SYSTEM, "fdopen failed in ambsync"); |
| 418 |
|
} |
| 419 |
|
if (fseek(ambinp, lastpos, 0) < 0) |
| 420 |
|
error(SYSTEM, "fseek failed in ambsync"); |
| 431 |
|
lastpos = lseek(fileno(ambfp), 0L, 1); |
| 432 |
|
fls.l_type = F_UNLCK; /* release file */ |
| 433 |
|
fcntl(fileno(ambfp), F_SETLKW, &fls); |
| 434 |
+ |
nunflshed = 0; |
| 435 |
|
return(n); |
| 436 |
+ |
} |
| 437 |
+ |
|
| 438 |
+ |
#else |
| 439 |
+ |
|
| 440 |
+ |
int |
| 441 |
+ |
ambsync() /* flush ambient file */ |
| 442 |
+ |
{ |
| 443 |
+ |
if (nunflshed == 0) |
| 444 |
+ |
return(0); |
| 445 |
+ |
nunflshed = 0; |
| 446 |
+ |
return(fflush(ambfp)); |
| 447 |
|
} |
| 448 |
|
|
| 449 |
|
#endif |
