1 #include "stdinc.h"
2 #include "dat.h"
3 #include "fns.h"
4 
5 static int	verbose;
6 
7 void
8 usage(void)
9 {
10 	fprint(2, "usage: rdarena [-v] arenapart arena\n");
11 	threadexitsall(0);
12 }
13 
14 static void
15 rdarena(Arena *arena)
16 {
17 	ZBlock *b;
18 	u64int a, e;
19 	u32int bs;
20 
21 	fprint(2, "copying %s to standard output\n", arena->name);
22 	printarena(2, arena);
23 
24 	bs = MaxIoSize;
25 	if(bs < arena->blocksize)
26 		bs = arena->blocksize;
27 
28 	b = alloczblock(bs, 0);
29 	e = arena->base + arena->size + arena->blocksize;
30 	for(a = arena->base - arena->blocksize; a + arena->blocksize <= e; a += bs){
31 		if(a + bs > e)
32 			bs = arena->blocksize;
33 		if(readpart(arena->part, a, b->data, bs) < 0)
34 			fprint(2, "can't copy %s, read at %lld failed: %r\n", arena->name, a);	
35 		if(write(1, b->data, bs) != bs)
36 			sysfatal("can't copy %s, write at %lld failed: %r", arena->name, a);
37 	}
38 
39 	freezblock(b);
40 }
41 
42 void
43 threadmain(int argc, char *argv[])
44 {
45 	ArenaPart *ap;
46 	Part *part;
47 	char *file, *aname;
48 	int i;
49 
50 	fmtinstall('V', vtscorefmt);
51 	statsinit();
52 
53 	ARGBEGIN{
54 	case 'v':
55 		verbose++;
56 		break;
57 	default:
58 		usage();
59 		break;
60 	}ARGEND
61 
62 	readonly = 1;
63 
64 	if(argc != 2)
65 		usage();
66 
67 	file = argv[0];
68 	aname = argv[1];
69 
70 	part = initpart(file, 0);
71 	if(part == nil)
72 		sysfatal("can't open partition %s: %r", file);
73 
74 	ap = initarenapart(part);
75 	if(ap == nil)
76 		sysfatal("can't initialize arena partition in %s: %r", file);
77 
78 	if(verbose)
79 		printarenapart(2, ap);
80 
81 	initdcache(8 * MaxDiskBlock);
82 
83 	for(i = 0; i < ap->narenas; i++){
84 		if(strcmp(ap->arenas[i]->name, aname) == 0){
85 			rdarena(ap->arenas[i]);
86 			threadexitsall(0);
87 		}
88 	}
89 
90 	sysfatal("couldn't find arena %s\n", aname);
91 }