1 |
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/* Copyright (c) 1991 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1993 Regents of the University of California */ |
2 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
6 |
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|
7 |
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/* |
8 |
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* ambient.c - routines dealing with ambient (inter-reflected) component. |
9 |
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* |
10 |
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* The macro AMBFLUSH (if defined) is the number of ambient values |
11 |
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* to wait before flushing to the ambient file. |
12 |
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* |
13 |
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* 5/9/86 |
9 |
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*/ |
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|
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#include "ray.h" |
18 |
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|
19 |
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#include "random.h" |
20 |
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|
21 |
< |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
21 |
> |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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|
23 |
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typedef struct ambtree { |
24 |
< |
AMBVAL *alist; /* ambient value list */ |
25 |
< |
struct ambtree *kid; /* 8 child nodes */ |
24 |
> |
AMBVAL *alist; /* ambient value list */ |
25 |
> |
struct ambtree *kid; /* 8 child nodes */ |
26 |
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} AMBTREE; /* ambient octree */ |
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|
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extern CUBE thescene; /* contains space boundaries */ |
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|
30 |
< |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
< |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
30 |
> |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
> |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
32 |
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|
33 |
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double maxarad; /* maximum ambient radius */ |
34 |
< |
double minarad; /* minimum ambient radius */ |
33 |
> |
double maxarad; /* maximum ambient radius */ |
34 |
> |
double minarad; /* minimum ambient radius */ |
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|
36 |
< |
static AMBTREE atrunk; /* our ambient trunk node */ |
36 |
> |
static AMBTREE atrunk; /* our ambient trunk node */ |
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|
38 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
39 |
+ |
static int nunflshed = 0; /* number of unflushed ambient values */ |
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|
41 |
< |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
41 |
> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
42 |
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|
43 |
< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
43 |
> |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
44 |
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|
45 |
+ |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
46 |
+ |
#define freeambtree(t) free((char *)(t)) |
47 |
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|
48 |
< |
setambient(afile) /* initialize calculation */ |
49 |
< |
char *afile; |
48 |
> |
extern long ftell(), lseek(); |
49 |
> |
static int initambfile(), avsave(), avinsert(), loadatree(); |
50 |
> |
static AMBVAL *avstore(); |
51 |
> |
#ifdef F_SETLKW |
52 |
> |
static aflock(); |
53 |
> |
#endif |
54 |
> |
|
55 |
> |
|
56 |
> |
setambres(ar) /* set ambient resolution */ |
57 |
> |
int ar; |
58 |
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{ |
59 |
< |
long ftell(); |
60 |
< |
AMBVAL amb; |
59 |
> |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
60 |
> |
/* set min & max radii */ |
61 |
> |
if (ar <= 0) { |
62 |
> |
minarad = 0.0; |
63 |
> |
maxarad = thescene.cusize / 2.0; |
64 |
> |
} else { |
65 |
> |
minarad = thescene.cusize / ar; |
66 |
> |
maxarad = 16.0 * minarad; /* heuristic */ |
67 |
> |
if (maxarad > thescene.cusize / 2.0) |
68 |
> |
maxarad = thescene.cusize / 2.0; |
69 |
> |
} |
70 |
> |
if (maxarad <= FTINY) |
71 |
> |
maxarad = .001; |
72 |
> |
} |
73 |
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|
56 |
– |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
57 |
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/* minimum radius */ |
58 |
– |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
74 |
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|
75 |
< |
/* open ambient file */ |
76 |
< |
if (afile != NULL) |
77 |
< |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
78 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
79 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, |
80 |
< |
thescene.cusize); |
81 |
< |
/* align */ |
82 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
83 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
84 |
< |
sprintf(errmsg, "cannot open ambient file \"%s\"", |
85 |
< |
afile); |
86 |
< |
error(SYSTEM, errmsg); |
87 |
< |
} |
75 |
> |
setambacc(newa) /* set ambient accuracy */ |
76 |
> |
double newa; |
77 |
> |
{ |
78 |
> |
static double oldambacc = -1.0; |
79 |
> |
AMBTREE oldatrunk; |
80 |
> |
|
81 |
> |
ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
82 |
> |
if (oldambacc < -FTINY) |
83 |
> |
oldambacc = ambacc; /* do nothing first call */ |
84 |
> |
if (fabs(newa - oldambacc) < 0.01) |
85 |
> |
return; /* insignificant -- don't bother */ |
86 |
> |
if (ambacc <= FTINY) |
87 |
> |
return; /* cannot build new tree */ |
88 |
> |
/* else need to rebuild tree */ |
89 |
> |
copystruct(&oldatrunk, &atrunk); |
90 |
> |
atrunk.alist = NULL; |
91 |
> |
atrunk.kid = NULL; |
92 |
> |
loadatree(&oldatrunk); |
93 |
> |
oldambacc = ambacc; /* remeber setting for next call */ |
94 |
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} |
95 |
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|
96 |
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|
97 |
+ |
setambient(afile) /* initialize calculation */ |
98 |
+ |
char *afile; |
99 |
+ |
{ |
100 |
+ |
long headlen; |
101 |
+ |
AMBVAL amb; |
102 |
+ |
/* init ambient limits */ |
103 |
+ |
setambres(ambres); |
104 |
+ |
setambacc(ambacc); |
105 |
+ |
if (afile == NULL) |
106 |
+ |
return; |
107 |
+ |
if (ambacc <= FTINY) { |
108 |
+ |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
109 |
+ |
afile); |
110 |
+ |
error(WARNING, errmsg); |
111 |
+ |
return; |
112 |
+ |
} |
113 |
+ |
/* open ambient file */ |
114 |
+ |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
115 |
+ |
initambfile(0); |
116 |
+ |
headlen = ftell(ambfp); |
117 |
+ |
while (readambval(&amb, ambfp)) |
118 |
+ |
avinsert(avstore(&amb)); |
119 |
+ |
/* align */ |
120 |
+ |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
121 |
+ |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
122 |
+ |
initambfile(1); |
123 |
+ |
else { |
124 |
+ |
sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
125 |
+ |
error(SYSTEM, errmsg); |
126 |
+ |
} |
127 |
+ |
nunflshed++; /* lie */ |
128 |
+ |
ambsync(); |
129 |
+ |
} |
130 |
+ |
|
131 |
+ |
|
132 |
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ambnotify(obj) /* record new modifier */ |
133 |
< |
OBJECT obj; |
133 |
> |
OBJECT obj; |
134 |
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{ |
135 |
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static int hitlimit = 0; |
136 |
< |
register OBJREC *o = objptr(obj); |
136 |
> |
register OBJREC *o = objptr(obj); |
137 |
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register char **amblp; |
138 |
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|
139 |
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if (hitlimit || !ismodifier(o->otype)) |
156 |
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register RAY *r; |
157 |
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{ |
158 |
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static int rdepth = 0; /* ambient recursion */ |
159 |
< |
double wsum; |
159 |
> |
double d; |
160 |
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|
105 |
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rdepth++; /* increment level */ |
106 |
– |
|
161 |
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if (ambdiv <= 0) /* no ambient calculation */ |
162 |
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goto dumbamb; |
163 |
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/* check number of bounces */ |
164 |
< |
if (rdepth > ambounce) |
164 |
> |
if (rdepth >= ambounce) |
165 |
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goto dumbamb; |
166 |
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/* check ambient list */ |
167 |
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if (ambincl != -1 && r->ro != NULL && |
169 |
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goto dumbamb; |
170 |
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|
171 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
172 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
172 |
> |
rdepth++; |
173 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
174 |
> |
rdepth--; |
175 |
> |
if (d == 0.0) |
176 |
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goto dumbamb; |
177 |
< |
goto done; |
177 |
> |
return; |
178 |
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} |
179 |
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/* get ambient value */ |
180 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
181 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
182 |
< |
if (wsum > FTINY) |
183 |
< |
scalecolor(acol, 1.0/wsum); |
184 |
< |
else if (makeambient(acol, r) == 0.0) |
185 |
< |
goto dumbamb; |
186 |
< |
goto done; |
187 |
< |
|
181 |
> |
d = sumambient(acol, r, rdepth, |
182 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
183 |
> |
if (d > FTINY) |
184 |
> |
scalecolor(acol, 1.0/d); |
185 |
> |
else { |
186 |
> |
d = makeambient(acol, r, rdepth++); |
187 |
> |
rdepth--; |
188 |
> |
} |
189 |
> |
if (d > FTINY) |
190 |
> |
return; |
191 |
|
dumbamb: /* return global value */ |
192 |
|
copycolor(acol, ambval); |
133 |
– |
done: /* must finish here! */ |
134 |
– |
rdepth--; |
193 |
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} |
194 |
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|
195 |
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|
196 |
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double |
197 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
197 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
198 |
|
COLOR acol; |
199 |
|
register RAY *r; |
200 |
< |
AMBTREE *at; |
200 |
> |
int al; |
201 |
> |
AMBTREE *at; |
202 |
|
FVECT c0; |
203 |
< |
double s; |
203 |
> |
double s; |
204 |
|
{ |
205 |
< |
extern double sqrt(); |
147 |
< |
double d, e1, e2, wt, wsum; |
205 |
> |
double d, e1, e2, wt, wsum; |
206 |
|
COLOR ct; |
207 |
|
FVECT ck0; |
208 |
|
int i; |
209 |
|
register int j; |
210 |
< |
register AMBVAL *av; |
210 |
> |
register AMBVAL *av; |
211 |
|
/* do this node */ |
212 |
|
wsum = 0.0; |
213 |
|
for (av = at->alist; av != NULL; av = av->next) { |
214 |
|
/* |
215 |
< |
* Ray strength test. |
215 |
> |
* Ambient level test. |
216 |
|
*/ |
217 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
217 |
> |
if (av->lvl > al) /* list sorted, so this works */ |
218 |
> |
break; |
219 |
> |
if (av->weight < r->rweight-FTINY) |
220 |
|
continue; |
221 |
|
/* |
222 |
|
* Ambient radius test. |
243 |
|
for (j = 0; j < 3; j++) |
244 |
|
d += (r->rop[j] - av->pos[j]) * |
245 |
|
(av->dir[j] + r->ron[j]); |
246 |
< |
if (d*0.5 < -minarad*ambacc) |
246 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
247 |
|
continue; |
248 |
|
/* |
249 |
|
* Jittering final test reduces image artifacts. |
250 |
|
*/ |
251 |
|
wt = sqrt(e1) + sqrt(e2); |
252 |
< |
wt *= .9 + .2*frandom(); |
252 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
253 |
|
if (wt > ambacc) |
254 |
|
continue; |
255 |
|
if (wt <= 1e-3) |
257 |
|
else |
258 |
|
wt = 1.0 / wt; |
259 |
|
wsum += wt; |
260 |
< |
copycolor(ct, av->val); |
260 |
> |
extambient(ct, av, r->rop, r->ron); |
261 |
|
scalecolor(ct, wt); |
262 |
|
addcolor(acol, ct); |
263 |
|
} |
276 |
|
break; |
277 |
|
} |
278 |
|
if (j == 3) |
279 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
279 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
280 |
|
} |
281 |
|
return(wsum); |
282 |
|
} |
283 |
|
|
284 |
|
|
285 |
|
double |
286 |
< |
makeambient(acol, r) /* make a new ambient value */ |
286 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
287 |
|
COLOR acol; |
288 |
|
register RAY *r; |
289 |
+ |
int al; |
290 |
|
{ |
291 |
< |
AMBVAL amb; |
291 |
> |
AMBVAL amb; |
292 |
|
FVECT gp, gd; |
293 |
< |
|
294 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
293 |
> |
/* compute weight */ |
294 |
> |
amb.weight = pow(AVGREFL, (double)al); |
295 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
296 |
> |
amb.weight = r->rweight; |
297 |
> |
/* compute ambient */ |
298 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
299 |
|
if (amb.rad == 0.0) |
300 |
|
return(0.0); |
301 |
|
/* store it */ |
302 |
|
VCOPY(amb.pos, r->rop); |
303 |
|
VCOPY(amb.dir, r->ron); |
304 |
< |
amb.lvl = r->rlvl; |
240 |
< |
amb.weight = r->rweight; |
304 |
> |
amb.lvl = al; |
305 |
|
copycolor(amb.val, acol); |
306 |
|
VCOPY(amb.gpos, gp); |
307 |
|
VCOPY(amb.gdir, gd); |
308 |
|
/* insert into tree */ |
309 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
246 |
< |
avsave(&amb); /* write to file */ |
309 |
> |
avsave(&amb); /* and save to file */ |
310 |
|
return(amb.rad); |
311 |
|
} |
312 |
|
|
313 |
|
|
314 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
315 |
+ |
COLOR cr; |
316 |
+ |
register AMBVAL *ap; |
317 |
+ |
FVECT pv, nv; |
318 |
+ |
{ |
319 |
+ |
FVECT v1, v2; |
320 |
+ |
register int i; |
321 |
+ |
double d; |
322 |
+ |
|
323 |
+ |
d = 1.0; /* zeroeth order */ |
324 |
+ |
/* gradient due to translation */ |
325 |
+ |
for (i = 0; i < 3; i++) |
326 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
327 |
+ |
/* gradient due to rotation */ |
328 |
+ |
VCOPY(v1, ap->dir); |
329 |
+ |
fcross(v2, v1, nv); |
330 |
+ |
d += DOT(ap->gdir, v2); |
331 |
+ |
if (d <= 0.0) { |
332 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
333 |
+ |
return; |
334 |
+ |
} |
335 |
+ |
copycolor(cr, ap->val); |
336 |
+ |
scalecolor(cr, d); |
337 |
+ |
} |
338 |
+ |
|
339 |
+ |
|
340 |
|
static |
341 |
< |
avsave(av) /* save an ambient value */ |
342 |
< |
AMBVAL *av; |
341 |
> |
initambfile(creat) /* initialize ambient file */ |
342 |
> |
int creat; |
343 |
|
{ |
344 |
< |
#ifdef AMBFLUSH |
345 |
< |
static int nunflshed = 0; |
344 |
> |
extern char *progname, *octname, VersionID[]; |
345 |
> |
|
346 |
> |
#ifdef F_SETLKW |
347 |
> |
aflock(creat ? F_WRLCK : F_RDLCK); |
348 |
|
#endif |
349 |
+ |
#ifdef MSDOS |
350 |
+ |
setmode(fileno(ambfp), O_BINARY); |
351 |
+ |
#endif |
352 |
+ |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
353 |
+ |
if (creat) { /* new file */ |
354 |
+ |
newheader("RADIANCE", ambfp); |
355 |
+ |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
356 |
+ |
progname, colval(ambval,RED), |
357 |
+ |
colval(ambval,GRN), colval(ambval,BLU), |
358 |
+ |
ambounce, ambacc); |
359 |
+ |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
360 |
+ |
ambdiv, ambssamp, ambres, |
361 |
+ |
octname==NULL ? "" : octname); |
362 |
+ |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
363 |
+ |
fputformat(AMBFMT, ambfp); |
364 |
+ |
putc('\n', ambfp); |
365 |
+ |
putambmagic(ambfp); |
366 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
367 |
+ |
error(USER, "bad ambient file"); |
368 |
+ |
} |
369 |
+ |
|
370 |
+ |
|
371 |
+ |
static |
372 |
+ |
avsave(av) /* insert and save an ambient value */ |
373 |
+ |
AMBVAL *av; |
374 |
+ |
{ |
375 |
+ |
avinsert(avstore(av)); |
376 |
|
if (ambfp == NULL) |
377 |
|
return; |
378 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
378 |
> |
if (writambval(av, ambfp) < 0) |
379 |
|
goto writerr; |
380 |
< |
#ifdef AMBFLUSH |
381 |
< |
if (++nunflshed >= AMBFLUSH) { |
264 |
< |
if (fflush(ambfp) == EOF) |
380 |
> |
if (++nunflshed >= AMBFLUSH) |
381 |
> |
if (ambsync() == EOF) |
382 |
|
goto writerr; |
266 |
– |
nunflshed = 0; |
267 |
– |
} |
268 |
– |
#endif |
383 |
|
return; |
384 |
|
writerr: |
385 |
|
error(SYSTEM, "error writing ambient file"); |
386 |
|
} |
387 |
|
|
388 |
|
|
389 |
+ |
static AMBVAL * |
390 |
+ |
avstore(aval) /* allocate memory and store aval */ |
391 |
+ |
register AMBVAL *aval; |
392 |
+ |
{ |
393 |
+ |
register AMBVAL *av; |
394 |
+ |
|
395 |
+ |
if ((av = newambval()) == NULL) |
396 |
+ |
error(SYSTEM, "out of memory in avstore"); |
397 |
+ |
copystruct(av, aval); |
398 |
+ |
return(av); |
399 |
+ |
} |
400 |
+ |
|
401 |
+ |
|
402 |
|
static |
403 |
< |
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
404 |
< |
AMBVAL *aval; |
278 |
< |
register AMBTREE *at; |
279 |
< |
FVECT c0; |
280 |
< |
double s; |
403 |
> |
avinsert(av) /* insert ambient value in our tree */ |
404 |
> |
register AMBVAL *av; |
405 |
|
{ |
406 |
+ |
register AMBTREE *at; |
407 |
+ |
register AMBVAL *ap; |
408 |
+ |
AMBVAL avh; |
409 |
|
FVECT ck0; |
410 |
+ |
double s; |
411 |
|
int branch; |
284 |
– |
register AMBVAL *av; |
412 |
|
register int i; |
413 |
|
|
414 |
< |
if ((av = newambval()) == NULL) |
415 |
< |
goto memerr; |
416 |
< |
copystruct(av, aval); |
417 |
< |
VCOPY(ck0, c0); |
414 |
> |
if (av->rad <= FTINY) |
415 |
> |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
416 |
> |
at = &atrunk; |
417 |
> |
VCOPY(ck0, thescene.cuorg); |
418 |
> |
s = thescene.cusize; |
419 |
|
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
420 |
|
if (at->kid == NULL) |
421 |
|
if ((at->kid = newambtree()) == NULL) |
422 |
< |
goto memerr; |
422 |
> |
error(SYSTEM, "out of memory in avinsert"); |
423 |
|
s *= 0.5; |
424 |
|
branch = 0; |
425 |
|
for (i = 0; i < 3; i++) |
429 |
|
} |
430 |
|
at = at->kid + branch; |
431 |
|
} |
432 |
< |
av->next = at->alist; |
433 |
< |
at->alist = av; |
434 |
< |
return; |
435 |
< |
memerr: |
436 |
< |
error(SYSTEM, "out of memory in avinsert"); |
432 |
> |
avh.next = at->alist; /* order by increasing level */ |
433 |
> |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
434 |
> |
if (ap->next->lvl >= av->lvl) |
435 |
> |
break; |
436 |
> |
av->next = ap->next; |
437 |
> |
ap->next = av; |
438 |
> |
at->alist = avh.next; |
439 |
|
} |
440 |
+ |
|
441 |
+ |
|
442 |
+ |
static |
443 |
+ |
loadatree(at) /* move tree to main store */ |
444 |
+ |
register AMBTREE *at; |
445 |
+ |
{ |
446 |
+ |
register AMBVAL *av; |
447 |
+ |
register int i; |
448 |
+ |
/* transfer values at this node */ |
449 |
+ |
for (av = at->alist; av != NULL; av = at->alist) { |
450 |
+ |
at->alist = av->next; |
451 |
+ |
avinsert(av); |
452 |
+ |
} |
453 |
+ |
if (at->kid == NULL) |
454 |
+ |
return; |
455 |
+ |
for (i = 0; i < 8; i++) /* transfer and free children */ |
456 |
+ |
loadatree(at->kid+i); |
457 |
+ |
freeambtree(at->kid); |
458 |
+ |
} |
459 |
+ |
|
460 |
+ |
|
461 |
+ |
#ifdef F_SETLKW |
462 |
+ |
|
463 |
+ |
static |
464 |
+ |
aflock(typ) /* lock/unlock ambient file */ |
465 |
+ |
int typ; |
466 |
+ |
{ |
467 |
+ |
static struct flock fls; /* static so initialized to zeroes */ |
468 |
+ |
|
469 |
+ |
fls.l_type = typ; |
470 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
471 |
+ |
error(SYSTEM, "cannot (un)lock ambient file"); |
472 |
+ |
} |
473 |
+ |
|
474 |
+ |
|
475 |
+ |
int |
476 |
+ |
ambsync() /* synchronize ambient file */ |
477 |
+ |
{ |
478 |
+ |
static FILE *ambinp = NULL; |
479 |
+ |
static long lastpos = -1; |
480 |
+ |
long flen; |
481 |
+ |
AMBVAL avs; |
482 |
+ |
register int n; |
483 |
+ |
|
484 |
+ |
if (nunflshed == 0) |
485 |
+ |
return(0); |
486 |
+ |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
487 |
+ |
goto syncend; |
488 |
+ |
/* gain exclusive access */ |
489 |
+ |
aflock(F_WRLCK); |
490 |
+ |
/* see if file has grown */ |
491 |
+ |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
492 |
+ |
goto seekerr; |
493 |
+ |
if (n = flen - lastpos) { /* file has grown */ |
494 |
+ |
if (ambinp == NULL) { /* use duplicate filedes */ |
495 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
496 |
+ |
if (ambinp == NULL) |
497 |
+ |
error(SYSTEM, "fdopen failed in ambsync"); |
498 |
+ |
} |
499 |
+ |
if (fseek(ambinp, lastpos, 0) < 0) |
500 |
+ |
goto seekerr; |
501 |
+ |
while (n >= AMBVALSIZ) { /* load contributed values */ |
502 |
+ |
readambval(&avs, ambinp); |
503 |
+ |
avinsert(avstore(&avs)); |
504 |
+ |
n -= AMBVALSIZ; |
505 |
+ |
} |
506 |
+ |
/*** seek always as safety measure |
507 |
+ |
if (n) ***/ /* alignment */ |
508 |
+ |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
509 |
+ |
goto seekerr; |
510 |
+ |
} |
511 |
+ |
#ifdef DEBUG |
512 |
+ |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
513 |
+ |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
514 |
+ |
ambfp->_ptr - ambfp->_base, |
515 |
+ |
nunflshed*AMBVALSIZ); |
516 |
+ |
error(CONSISTENCY, errmsg); |
517 |
+ |
} |
518 |
+ |
#endif |
519 |
+ |
syncend: |
520 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
521 |
+ |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
522 |
+ |
goto seekerr; |
523 |
+ |
aflock(F_UNLCK); /* release file */ |
524 |
+ |
nunflshed = 0; |
525 |
+ |
return(n); |
526 |
+ |
seekerr: |
527 |
+ |
error(SYSTEM, "seek failed in ambsync"); |
528 |
+ |
} |
529 |
+ |
|
530 |
+ |
#else |
531 |
+ |
|
532 |
+ |
int |
533 |
+ |
ambsync() /* flush ambient file */ |
534 |
+ |
{ |
535 |
+ |
if (nunflshed == 0) |
536 |
+ |
return(0); |
537 |
+ |
nunflshed = 0; |
538 |
+ |
return(fflush(ambfp)); |
539 |
+ |
} |
540 |
+ |
|
541 |
+ |
#endif |