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/* Write portions of a store to stdout
Copyright (C) 1996,97,99,2001,02 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <argp.h>
#include <error.h>
#include <unistd.h>
#include <hurd.h>
#include <sys/fcntl.h>
#include <sys/mman.h>
#include <hurd/store.h>
#include <version.h>
const char *argp_program_version = STANDARD_HURD_VERSION (storeread);
struct argp_option options[] = {
{"file", 'f', 0, 0, "Use file IO instead of the raw device"},
{"block-size", 'b', "BYTES", 0, "Set the file block size"},
{0, 0}
};
char *arg_doc = "FILE [ADDR [LENGTH]]...";
char *doc = "\vADDR is in blocks, and defaults to 0; LENGTH is in bytes, and defaults to the remainder of FILE.";
int
main (int argc, char **argv)
{
struct store *store = 0;
store_offset_t addr = -1;
int dumped = 0, use_file_io = 0, block_size = 0;
void dump (store_offset_t addr, ssize_t len)
{
char buf[4096];
void *data = buf;
size_t data_len = sizeof (buf);
/* XXX: store->size can be too big for len. */
error_t err =
store_read (store, addr, len < 0 ? store->size : len,
&data, &data_len);
if (err)
error (5, err, store->name ? "%s" : "<store>", store->name);
if (write (1, data, data_len) < 0)
error (6, errno, "stdout");
if (data != buf)
munmap (data, data_len);
}
error_t parse_opt (int key, char *arg, struct argp_state *state)
{
switch (key)
{
case 'f': use_file_io = 1; break;
case 'b': block_size = atoi (arg); break;
case ARGP_KEY_ARG:
if (! store)
{
error_t err;
file_t source = file_name_lookup (arg, O_READ, 0);
if (errno)
error (2, errno, "%s", arg);
if (use_file_io)
if (block_size)
{
struct stat stat;
err = io_stat (source, &stat);
if (! err)
{
struct store_run run = {0, stat.st_size / block_size};
err = _store_file_create (source, 0, block_size, &run, 1,
&store);
}
}
else
err = store_file_create (source, 0, &store);
else
err = store_create (source, 0, 0, &store);
if (err)
error (3, err, "%s", arg);
}
else if (addr < 0)
addr = atoll (arg);
else
{
dump (addr, atoi (arg));
dumped = 1;
addr = -1;
}
break;
case ARGP_KEY_END:
if (addr >= 0)
dump (addr, -1);
else if (! dumped)
dump (0, -1);
break;
case ARGP_KEY_NO_ARGS:
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
struct argp argp = {options, parse_opt, arg_doc, doc};
argp_parse (&argp, argc, argv, 0, 0, 0);
exit (0);
}
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