mirror of
https://github.com/9fans/plan9port.git
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91 lines
1.6 KiB
C
91 lines
1.6 KiB
C
#include "stdinc.h"
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#include "dat.h"
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#include "fns.h"
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static int verbose;
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void
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usage(void)
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{
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fprint(2, "usage: rdarena [-v] arenapart arena\n");
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threadexitsall(0);
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}
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static void
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rdarena(Arena *arena)
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{
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ZBlock *b;
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u64int a, e;
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u32int bs;
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fprint(2, "copying %s to standard output\n", arena->name);
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printarena(2, arena);
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bs = MaxIoSize;
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if(bs < arena->blocksize)
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bs = arena->blocksize;
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b = alloczblock(bs, 0, arena->blocksize);
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e = arena->base + arena->size + arena->blocksize;
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for(a = arena->base - arena->blocksize; a + arena->blocksize <= e; a += bs){
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if(a + bs > e)
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bs = arena->blocksize;
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if(readpart(arena->part, a, b->data, bs) < 0)
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fprint(2, "can't copy %s, read at %lld failed: %r\n", arena->name, a);
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if(write(1, b->data, bs) != bs)
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sysfatal("can't copy %s, write at %lld failed: %r", arena->name, a);
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}
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freezblock(b);
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}
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void
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threadmain(int argc, char *argv[])
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{
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ArenaPart *ap;
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Part *part;
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char *file, *aname;
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int i;
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ventifmtinstall();
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statsinit();
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ARGBEGIN{
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case 'v':
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verbose++;
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break;
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default:
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usage();
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break;
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}ARGEND
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readonly = 1;
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if(argc != 2)
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usage();
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file = argv[0];
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aname = argv[1];
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part = initpart(file, OREAD|ODIRECT);
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if(part == nil)
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sysfatal("can't open partition %s: %r", file);
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ap = initarenapart(part);
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if(ap == nil)
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sysfatal("can't initialize arena partition in %s: %r", file);
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if(verbose)
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printarenapart(2, ap);
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initdcache(8 * MaxDiskBlock);
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for(i = 0; i < ap->narenas; i++){
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if(strcmp(ap->arenas[i]->name, aname) == 0){
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rdarena(ap->arenas[i]);
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threadexitsall(0);
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}
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}
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sysfatal("couldn't find arena %s\n", aname);
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}
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