| rsc | 7a4ee46 | 2003-11-23 17:54:58 +0000 | [diff] [blame] | 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 | } |
