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#include "stdinc.h"
#include "dat.h"
#include "fns.h"
static int verbose;
void
usage(void)
{
fprint(2, "usage: rdarena [-v] arenapart arena\n");
threadexitsall(0);
}
static void
rdarena(Arena *arena)
{
ZBlock *b;
u64int a, e;
u32int bs;
fprint(2, "copying %s to standard output\n", arena->name);
printarena(2, arena);
bs = MaxIoSize;
if(bs < arena->blocksize)
bs = arena->blocksize;
b = alloczblock(bs, 0, arena->blocksize);
e = arena->base + arena->size + arena->blocksize;
for(a = arena->base - arena->blocksize; a + arena->blocksize <= e; a += bs){
if(a + bs > e)
bs = arena->blocksize;
if(readpart(arena->part, a, b->data, bs) < 0)
fprint(2, "can't copy %s, read at %lld failed: %r\n", arena->name, a);
if(write(1, b->data, bs) != bs)
sysfatal("can't copy %s, write at %lld failed: %r", arena->name, a);
}
freezblock(b);
}
void
threadmain(int argc, char *argv[])
{
ArenaPart *ap;
Part *part;
char *file, *aname;
int i;
ventifmtinstall();
statsinit();
ARGBEGIN{
case 'v':
verbose++;
break;
default:
usage();
break;
}ARGEND
readonly = 1;
if(argc != 2)
usage();
file = argv[0];
aname = argv[1];
part = initpart(file, OREAD|ODIRECT);
if(part == nil)
sysfatal("can't open partition %s: %r", file);
ap = initarenapart(part);
if(ap == nil)
sysfatal("can't initialize arena partition in %s: %r", file);
if(verbose)
printarenapart(2, ap);
initdcache(8 * MaxDiskBlock);
for(i = 0; i < ap->narenas; i++){
if(strcmp(ap->arenas[i]->name, aname) == 0){
rdarena(ap->arenas[i]);
threadexitsall(0);
}
}
sysfatal("couldn't find arena %s\n", aname);
}
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