1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4
5 #define index findex
6 char choice[2048];
7 char *index = "#9/lib/fortunes.index";
8 char *fortunes = "#9/lib/fortunes";
9
10 void
main(int argc,char * argv[])11 main(int argc, char *argv[])
12 {
13 int i;
14 long offs;
15 uchar off[4];
16 int ix, nix;
17 int newindex, oldindex;
18 char *p;
19 Dir *fbuf, *ixbuf;
20 Biobuf *f, g;
21
22 index = unsharp(index);
23 fortunes = unsharp(fortunes);
24
25 newindex = 0;
26 oldindex = 0;
27 ix = offs = 0;
28 if((f=Bopen(argc>1?argv[1]:fortunes, OREAD)) == 0){
29 print("Misfortune!\n");
30 exits("misfortune");
31 }
32 ixbuf = nil;
33 if(argc == 1){
34 ix = open(index, OREAD);
35 if(ix>=0){
36 oldindex = 1;
37 ixbuf = dirfstat(ix);
38 fbuf = dirfstat(Bfildes(f));
39 if(ixbuf == nil || fbuf == nil){
40 print("Misfortune?\n");
41 exits("misfortune");
42 }
43 if(fbuf->mtime > ixbuf->mtime){
44 nix = create(index, OWRITE, 0666);
45 if(nix >= 0){
46 close(ix);
47 ix = nix;
48 newindex = 1;
49 oldindex = 0;
50 }
51 }
52 }else{
53 ix = create(index, OWRITE, 0666);
54 if(ix >= 0)
55 newindex = 1;
56 }
57 }
58 if(oldindex){
59 srand(getpid());
60 seek(ix, lrand()%(ixbuf->length/sizeof(offs))*sizeof(offs), 0);
61 read(ix, off, sizeof(off));
62 Bseek(f, off[0]|(off[1]<<8)|(off[2]<<16)|(off[3]<<24), 0);
63 p = Brdline(f, '\n');
64 if(p){
65 p[Blinelen(f)-1] = 0;
66 strcpy(choice, p);
67 }else
68 strcpy(choice, "Misfortune!");
69 }else{
70 Binit(&g, ix, 1);
71 srand(getpid());
72 for(i=1;;i++){
73 if(newindex)
74 offs = Boffset(f);
75 p = Brdline(f, '\n');
76 if(p == 0)
77 break;
78 p[Blinelen(f)-1] = 0;
79 if(newindex){
80 off[0] = offs;
81 off[1] = offs>>8;
82 off[2] = offs>>16;
83 off[3] = offs>>24;
84 Bwrite(&g, off, sizeof(off));
85 }
86 if(lrand()%i==0)
87 strcpy(choice, p);
88 }
89 }
90 print("%s\n", choice);
91 exits(0);
92 }
93