12 snprint(buf, sizeof buf, "/tmp/X%d.%.4ssam", getpid(), getuser());
13 for(i='A'; i<='Z'; i++){
15 if(access(buf, AEXIST) == 0)
17 fd = create(buf, ORDWR|ORCLOSE|OCEXEC, 0600);
24 extern int tempdisk(void);
32 d = emalloc(sizeof(Disk));
35 fprint(2, "sam: can't create temp file: %r\n");
43 ntosize(uint n, uint *ip)
48 panic("internal error: ntosize");
50 if(size & (Blockincr-1))
51 size += Blockincr - (size & (Blockincr-1));
52 /* last bucket holds blocks of exactly Maxblock */
55 return size * sizeof(Rune);
59 disknewblock(Disk *d, uint n)
64 size = ntosize(n, &i);
67 d->free[i] = b->u.next;
69 /* allocate in chunks to reduce malloc overhead */
71 blist = emalloc(100*sizeof(Block));
72 for(j=0; j<100-1; j++)
73 blist[j].u.next = &blist[j+1];
78 if(d->addr+size < d->addr){
79 panic("temp file overflow");
88 diskrelease(Disk *d, Block *b)
93 b->u.next = d->free[i];
98 diskwrite(Disk *d, Block **bp, Rune *r, uint n)
104 size = ntosize(b->u.n, nil);
105 nsize = ntosize(n, nil);
108 b = disknewblock(d, n);
111 if(pwrite(d->fd, r, n*sizeof(Rune), b->addr) != n*sizeof(Rune))
112 panic("write error to temp file");
117 diskread(Disk *d, Block *b, Rune *r, uint n)
120 panic("internal error: diskread");
122 ntosize(b->u.n, nil); /* called only for sanity check on Maxblock */
123 if(pread(d->fd, r, n*sizeof(Rune), b->addr) != n*sizeof(Rune))
124 panic("read error from temp file");