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#include "holo.h" |
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#ifndef CACHESIZE |
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#define CACHESIZE 16 /* default cache size (Mbytes, 0==inf) */ |
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#ifdef BIGMEM |
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#define CACHESIZE 17 /* default cache size (Mbytes, 0==inf) */ |
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#else |
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#define CACHESIZE 5 |
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#endif |
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#endif |
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#ifndef FREEBEAMS |
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#define FREEBEAMS 1500 /* maximum beams to free at a time */ |
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#endif |
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#endif |
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#ifndef FF_DEFAULT |
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/* when to free a beam fragment */ |
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#define FF_DEFAULT (FF_ALLOC|FF_WRITE|FF_KILL) |
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#define FF_DEFAULT (FF_WRITE|FF_KILL) |
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#endif |
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#ifndef MINDIRSEL |
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/* minimum directory seek length */ |
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static int nhdfragls; /* size of hdfragl array */ |
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HOLO * |
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hdalloc(hproto) /* allocate and set holodeck section based on grid */ |
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HDGRID *hproto; |
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{ |
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HOLO hdhead; |
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register HOLO *hp; |
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int n; |
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/* copy grid to temporary header */ |
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bcopy((char *)hproto, (char *)&hdhead, sizeof(HDGRID)); |
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/* compute grid vectors and sizes */ |
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hdcompgrid(&hdhead); |
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/* allocate header with directory */ |
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n = sizeof(HOLO)+nbeams(&hdhead)*sizeof(BEAMI); |
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if ((hp = (HOLO *)malloc(n)) == NULL) |
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return(NULL); |
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/* copy header information */ |
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copystruct(hp, &hdhead); |
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/* allocate and clear beam list */ |
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hp->bl = (BEAM **)malloc((nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
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if (hp->bl == NULL) { |
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free((char *)hp); |
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return(NULL); |
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} |
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bzero((char *)hp->bl, (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
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hp->bl[0] = (BEAM *)(hp->bl+nbeams(hp)+1); /* set blglob(hp) */ |
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hp->fd = -1; |
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hp->dirty = 0; |
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hp->priv = NULL; |
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/* clear beam directory */ |
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bzero((char *)hp->bi, (nbeams(hp)+1)*sizeof(BEAMI)); |
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return(hp); /* all is well */ |
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} |
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|
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|
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char * |
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hdrealloc(ptr, siz, rout) /* (re)allocate memory, retry then error */ |
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char *ptr; |
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} |
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markdirty(hp, i) /* mark holodeck directory position dirty */ |
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hdmarkdirty(hp, i) /* mark holodeck directory position dirty */ |
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register HOLO *hp; |
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int i; |
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{ |
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if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), 0) < 0 |
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|| write(hp->fd, (char *)&smudge, |
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sizeof(BEAMI)) != sizeof(BEAMI)) |
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error(SYSTEM, "seek/write error in markdirty"); |
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error(SYSTEM, "seek/write error in hdmarkdirty"); |
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hp->dirseg[0].s = i; |
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hp->dirseg[0].n = 1; |
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return; |
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} |
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int |
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hdfreefrag(hp, i) /* free a file fragment */ |
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HOLO *hp; |
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int i; |
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register int j, k; |
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if (bi->nrd <= 0) |
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return; |
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return(0); |
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DCHECK(hp->fd < 0 | hp->fd >= nhdfragls || !hdfragl[hp->fd].nlinks, |
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CONSISTENCY, "bad file descriptor in hdfreefrag"); |
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f = &hdfragl[hp->fd]; |
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if (j >= MAXFRAGB*FRAGBLK) { |
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f->nfrags = j--; /* stop list growth */ |
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if (bi->nrd <= f->fi[j].nrd) |
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return; /* new one no better than discard */ |
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return(0); /* new one no better than discard */ |
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} |
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#endif |
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if (j % FRAGBLK == 0) { /* more (or less) free list space */ |
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(j+FRAGBLK)*sizeof(BEAMI)); |
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if (newp == NULL) { |
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f->nfrags--; /* graceful failure */ |
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return; |
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return(0); |
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} |
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f->fi = newp; |
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} |
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} |
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biglob(hp)->nrd -= bi->nrd; /* tell fragment it's free */ |
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bi->nrd = 0; |
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bi->fo = 0; |
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bi->fo = 0L; |
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hdmarkdirty(hp, i); /* assume we'll reallocate */ |
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return(1); |
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} |
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unsigned int4 nrays; |
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{ |
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register struct fraglist *f; |
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register int j, k; |
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register int j; |
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long nfo; |
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if (nrays == 0) |
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DCHECK(fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks, |
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CONSISTENCY, "bad file descriptor in hdallocfrag"); |
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f = &hdfragl[fd]; |
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k = -1; /* find closest-sized fragment */ |
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for (j = f->nfrags; j-- > 0; ) |
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if (f->fi[j].nrd >= nrays && |
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(k < 0 || f->fi[j].nrd < f->fi[k].nrd)) |
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if (f->fi[k=j].nrd == nrays) |
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break; |
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if (k < 0) { /* no fragment -- extend file */ |
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for (j = f->nfrags; j-- > 0; ) /* first fit algorithm */ |
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if (f->fi[j].nrd >= nrays) |
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break; |
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if (j < 0) { /* no fragment -- extend file */ |
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nfo = f->flen; |
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f->flen += nrays*sizeof(RAYVAL); |
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} else { /* else use fragment */ |
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nfo = f->fi[k].fo; |
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f->fi[k].fo += nrays*sizeof(RAYVAL); |
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f->fi[k].nrd -= nrays; |
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nfo = f->fi[j].fo; |
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f->fi[j].fo += nrays*sizeof(RAYVAL); |
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f->fi[j].nrd -= nrays; |
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} |
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return(nfo); |
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} |
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register HOLO *hp; |
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register int i; |
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{ |
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int fragfreed; |
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unsigned int4 nrays; |
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unsigned int n; |
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long nfo; |
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/* is current fragment OK? */ |
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if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
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return(0); |
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if (hdfragflags&FF_WRITE && hp->bi[i].nrd) |
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hdfreefrag(hp, i); /* relinquish old fragment */ |
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/* relinquish old fragment? */ |
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fragfreed = hdfragflags&FF_WRITE && hp->bi[i].nrd && hdfreefrag(hp,i); |
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if (nrays) { /* get and write new fragment */ |
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nfo = hdallocfrag(hp->fd, nrays); |
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errno = 0; |
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hp->bi[i].fo = nfo; |
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} else |
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hp->bi[i].fo = 0L; |
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biglob(hp)->nrd += hp->bi[i].nrd = nrays; |
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markdirty(hp, i); /* section directory now out of date */ |
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biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
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hp->bi[i].nrd = nrays; |
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if (!fragfreed) |
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hdmarkdirty(hp, i); /* need to flag dir. ent. */ |
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return(1); |
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} |
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if (hdfragl[hp->fd].writerr) /* check for file error */ |
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return(0); |
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if (i == 0) { /* clear entire holodeck */ |
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if (blglob(hp)->nrm == 0) |
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return(0); /* already clear */ |
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nchanged = 0; |
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for (i = nbeams(hp); i > 0; i--) |
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if (hp->bl[i] != NULL) |
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nchanged += hdfreebeam(hp, i); |
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DCHECK(blglob(hp)->nrm != 0, |
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CONSISTENCY, "bad beam count in hdfreebeam"); |
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return(nchanged); |
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} |
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DCHECK(i < 1 | i > nbeams(hp), |
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return(nchanged); |
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} |
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if (i == 0) { /* clobber entire holodeck */ |
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if (biglob(hp)->nrd == 0 & blglob(hp)->nrm == 0) |
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return(0); /* already empty */ |
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nchanged = 0; |
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nchanged = 0; |
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for (i = nbeams(hp); i > 0; i--) |
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if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
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nchanged += hdkillbeam(hp, i); |
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if (hp->bl[i] != NULL) { /* free memory */ |
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blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
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free((char *)hp->bl[i]); |
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hp->bl[i] = NULL; |
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} else |
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nchanged = hp->bi[i].nrd; |
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if (hp->bi[i].nrd) { |
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if (hdfragflags&FF_KILL) |
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hdfreefrag(hp, i); |
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hp->bi[i].nrd = 0; /* make sure it's gone */ |
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if (hp->bi[i].nrd && !(hdfragflags&FF_KILL && hdfreefrag(hp,i))) { |
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biglob(hp)->nrd -= hp->bi[i].nrd; /* free failed */ |
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hp->bi[i].nrd = 0; |
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hp->bi[i].fo = 0L; |
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hdmarkdirty(hp, i); |
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} |
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hp->bl[i] = NULL; |
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return(nchanged); |
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} |
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return; |
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} |
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/* flush all data and free memory */ |
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hdfreebeam(hp, 0); |
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hdsync(hp, 0); |
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hdflush(hp); |
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/* release fragment resources */ |
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hdrelease(hp->fd); |
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/* remove hp from active list */ |