mirror of
https://github.com/9fans/plan9port.git
synced 2025-01-15 11:20:03 +00:00
94 lines
1.7 KiB
C
94 lines
1.7 KiB
C
#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#define index findex
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char choice[2048];
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char *index = "#9/lib/fortunes.index";
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char *fortunes = "#9/lib/fortunes";
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#define lrand rand
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void
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main(int argc, char *argv[])
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{
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int i;
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long offs;
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uchar off[4];
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int ix, nix;
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int newindex, oldindex;
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char *p;
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Dir *fbuf, *ixbuf;
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Biobuf *f, g;
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index = unsharp(index);
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fortunes = unsharp(fortunes);
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newindex = 0;
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oldindex = 0;
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ix = offs = 0;
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if((f=Bopen(argc>1?argv[1]:fortunes, OREAD)) == 0){
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print("Misfortune!\n");
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exits("misfortune");
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}
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ixbuf = nil;
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if(argc == 1){
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ix = open(index, OREAD);
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if(ix>=0){
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oldindex = 1;
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ixbuf = dirfstat(ix);
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fbuf = dirfstat(Bfildes(f));
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if(ixbuf == nil || fbuf == nil){
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print("Misfortune?\n");
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exits("misfortune");
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}
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if(fbuf->mtime > ixbuf->mtime){
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nix = create(index, OWRITE, 0666);
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if(nix >= 0){
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close(ix);
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ix = nix;
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newindex = 1;
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oldindex = 0;
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}
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}
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}else{
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ix = create(index, OWRITE, 0666);
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if(ix >= 0)
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newindex = 1;
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}
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}
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if(oldindex){
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srand(getpid());
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seek(ix, lrand()%(ixbuf->length/sizeof(offs))*sizeof(offs), 0);
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read(ix, off, sizeof(off));
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Bseek(f, off[0]|(off[1]<<8)|(off[2]<<16)|(off[3]<<24), 0);
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p = Brdline(f, '\n');
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if(p){
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p[Blinelen(f)-1] = 0;
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strcpy(choice, p);
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}else
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strcpy(choice, "Misfortune!");
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}else{
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Binit(&g, ix, 1);
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srand(getpid());
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for(i=1;;i++){
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if(newindex)
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offs = Boffset(f);
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p = Brdline(f, '\n');
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if(p == 0)
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break;
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p[Blinelen(f)-1] = 0;
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if(newindex){
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off[0] = offs;
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off[1] = offs>>8;
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off[2] = offs>>16;
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off[3] = offs>>24;
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Bwrite(&g, off, sizeof(off));
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}
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if(lrand()%i==0)
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strcpy(choice, p);
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}
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}
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print("%s\n", choice);
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exits(0);
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}
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