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/* Store argument parsing
Copyright (C) 1996 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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.,
675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h>
#include <assert.h>
#include <hurd.h>
#include <argp.h>
#include <argz.h>
#include "store.h"
static const struct argp_option options[] = {
{"device", 'D', 0, 0, "DEVICE is a mach device, not a file"},
{"interleave",'i', "BLOCKS", 0, "Interleave in runs of length BLOCKS"},
{"layer", 'l', 0, 0, "Layer multiple devices for redundancy"},
{0}
};
static const char args_doc[] = "DEVICE...";
static const char doc[] = "\vIf multiple DEVICEs are specified, they are"
" concatenated unless either --interleave or --layer is specified (mutually"
" exlusive).";
struct store_parsed
{
char *names;
size_t names_len;
off_t interleave; /* --interleave value */
int machdev : 1; /* --machdev specified */
int layer : 1; /* --layer specified */
};
void
store_parsed_free (struct store_parsed *parsed)
{
free (parsed->names);
free (parsed);
}
/* Add the arguments PARSED, and return the corresponding store in STORE. */
error_t
store_parsed_append_args (const struct store_parsed *parsed,
char **args, size_t *args_len)
{
error_t err = 0;
size_t num_names = argz_count (parsed->names, parsed->names_len);
if (parsed->machdev)
err = argz_add (args, args_len, "--machdev");
if (!err && num_names > 1 && (parsed->interleave || parsed->layer))
{
char buf[40];
if (parsed->interleave)
snprintf (buf, sizeof buf, "--interleave=%ld", parsed->interleave);
else
snprintf (buf, sizeof buf, "--layer=%ld", parsed->layer);
err = argz_add (args, args_len, buf);
}
if (! err)
err = argz_append (args, args_len, parsed->names, parsed->names_len);
return err;
}
/* Open PARSED, and return the corresponding store in STORE. */
error_t
store_parsed_open (const struct store_parsed *parsed, int flags,
struct store_class *classes,
struct store **store)
{
size_t num = argz_count (parsed->names, parsed->names_len);
error_t open (char *name, struct store **store)
{
if (parsed->machdev)
return store_device_open (name, flags, store);
else
return store_open (name, flags, classes, store);
}
if (num == 1)
return open (parsed->names, store);
else
{
int i;
char *name;
error_t err = 0;
struct store **stores = malloc (sizeof (struct store *) * num);
if (! stores)
return ENOMEM;
for (i = 0, name = parsed->names;
!err && i < num;
i++, name = argz_next (parsed->names, parsed->names_len, name))
err = open (name, &stores[i]);
if (! err)
if (parsed->interleave)
err =
store_ileave_create (stores, num, parsed->interleave,
flags, store);
else if (parsed->layer)
assert (! parsed->layer);
else
err = store_concat_create (stores, num, flags, store);
if (err)
{
while (i > 0)
store_free (stores[i--]);
free (stores);
}
return err;
}
}
static error_t
parse_opt (int opt, char *arg, struct argp_state *state)
{
error_t err;
struct store_parsed *parsed = state->hook;
/* Print a parsing error message and (if exiting is turned off) return the
error code ERR. */
#define PERR(err, fmt, args...) \
do { argp_error (state, fmt , ##args); return err; } while (0)
switch (opt)
{
case 'm':
parsed->machdev = 1; break;
case 'i':
if (parsed->layer)
PERR (EINVAL, "--layer and --interleave are exclusive");
if (parsed->interleave)
/* Actually no reason why we couldn't support this.... */
PERR (EINVAL, "--interleave specified multiple times");
parsed->interleave = atoi (arg);
if (! parsed->interleave)
PERR (EINVAL, "%s: Bad value for --interleave", arg);
break;
case 'l':
#if 1
argp_failure (state, 5, 0, "--layer not implemented");
return EINVAL;
#else
if (parsed->interleave)
PERR (EINVAL, "--layer and --interleave are exclusive");
parsed->layer = 1;
#endif
break;
case ARGP_KEY_ARG:
/* A store device to use! */
err = argz_add (&parsed->names, &parsed->names_len, arg);
if (err)
argp_failure (state, 1, err, "%s", arg);
return err;
break;
case ARGP_KEY_INIT:
/* Initialize our parsing state. */
if (! state->input)
return EINVAL; /* Need at least a way to return a result. */
state->hook = malloc (sizeof (struct store_parsed));
if (! state->hook)
return ENOMEM;
bzero (state->hook, sizeof (struct store_parsed));
break;
case ARGP_KEY_ERROR:
/* Parsing error occured, free everything. */
store_parsed_free (parsed); break;
case ARGP_KEY_SUCCESS:
/* Successfully finished parsing, return a result. */
if (parsed->names == 0)
{
store_parsed_free (parsed);
PERR (EINVAL, "No store specified");
}
else
*(struct store_parsed **)state->input = parsed;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
struct argp
store_argp = { options, parse_opt, args_doc, doc };
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