| 41 |
|
static AMBTREE atrunk; /* our ambient trunk node */ |
| 42 |
|
|
| 43 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
| 44 |
– |
static char *afname; /* ambient file name */ |
| 44 |
|
|
| 45 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
| 46 |
|
|
| 49 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
| 50 |
|
|
| 51 |
|
extern long ftell(), lseek(); |
| 52 |
+ |
static int initambfile(), avsave(), avinsert(), ambsync(); |
| 53 |
|
|
| 54 |
|
|
| 55 |
|
setambres(ar) /* set ambient resolution */ |
| 78 |
|
/* init ambient limits */ |
| 79 |
|
setambres(ambres); |
| 80 |
|
/* open ambient file */ |
| 81 |
< |
if ((afname = afile) != NULL) |
| 81 |
> |
if (afile != NULL) |
| 82 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 83 |
|
initambfile(0); |
| 84 |
|
headlen = ftell(ambfp); |
| 87 |
|
thescene.cusize); |
| 88 |
|
/* align */ |
| 89 |
|
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
| 90 |
< |
} else if ((ambfp = fopen(afile, "w")) != NULL) |
| 90 |
> |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
| 91 |
|
initambfile(1); |
| 92 |
|
else { |
| 93 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", |
| 324 |
|
putc('\n', ambfp); |
| 325 |
|
putambmagic(ambfp); |
| 326 |
|
fflush(ambfp); |
| 327 |
< |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 |
| 328 |
< |
|| !hasambmagic(ambfp)) { |
| 329 |
< |
sprintf(errmsg, "\"%s\" is not an ambient file", afname); |
| 330 |
< |
error(USER, errmsg); |
| 331 |
< |
} |
| 327 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 328 |
> |
error(USER, "bad ambient file"); |
| 329 |
|
} |
| 330 |
|
|
| 331 |
|
|
| 388 |
|
} |
| 389 |
|
|
| 390 |
|
|
| 391 |
< |
#include <fcntl.h> |
| 391 |
> |
#ifdef NIX |
| 392 |
|
|
| 393 |
+ |
static |
| 394 |
+ |
ambsync() /* flush ambient file */ |
| 395 |
+ |
{ |
| 396 |
+ |
return(fflush(ambfp)); |
| 397 |
+ |
} |
| 398 |
|
|
| 399 |
+ |
#else |
| 400 |
+ |
|
| 401 |
+ |
#include <fcntl.h> |
| 402 |
+ |
#include <sys/types.h> |
| 403 |
+ |
#include <sys/stat.h> |
| 404 |
+ |
|
| 405 |
|
static |
| 406 |
|
ambsync() /* synchronize ambient file */ |
| 407 |
|
{ |
| 408 |
|
static FILE *ambinp = NULL; |
| 409 |
|
struct flock fls; |
| 410 |
+ |
struct stat sts; |
| 411 |
|
AMBVAL avs; |
| 412 |
|
long lastpos, flen; |
| 413 |
|
register int n; |
| 420 |
|
error(SYSTEM, "cannot lock ambient file"); |
| 421 |
|
/* see if file has grown */ |
| 422 |
|
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
| 423 |
< |
flen = lseek(fileno(ambfp), 0L, 2); /* new(?) file length */ |
| 424 |
< |
if (n = (flen - lastpos)%AMBVALSIZ) /* assure alignment */ |
| 425 |
< |
lseek(fileno(ambfp), (long)-n, 1); |
| 423 |
> |
if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
| 424 |
> |
error(SYSTEM, "cannot stat ambient file"); |
| 425 |
> |
flen = sts.st_size; |
| 426 |
|
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
| 427 |
< |
if (ambinp == NULL && (ambinp = fopen(afname, "r")) == NULL) |
| 428 |
< |
error(SYSTEM, "cannot reopen ambient file"); |
| 420 |
< |
fseek(ambinp, lastpos, 0); /* go to previous position */ |
| 427 |
> |
if (ambinp == NULL) /* use duplicate file */ |
| 428 |
> |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
| 429 |
|
while (n--) { /* load contributed values */ |
| 430 |
|
readambval(&avs, ambinp); |
| 431 |
|
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
| 432 |
< |
} |
| 432 |
> |
} /* moves shared file pointer */ |
| 433 |
> |
if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
| 434 |
> |
lseek(fileno(ambfp), flen-n, 0); |
| 435 |
|
} |
| 436 |
|
n = fflush(ambfp); /* calls write() at last */ |
| 437 |
|
fls.l_type = F_UNLCK; /* release file */ |
| 438 |
|
fcntl(fileno(ambfp), F_SETLKW, &fls); |
| 439 |
|
return(n); |
| 440 |
|
} |
| 441 |
+ |
|
| 442 |
+ |
#endif |
