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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 <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <hurd.h>
#include <argp.h>
#include <argz.h>
#include "store.h"
static const struct argp_option options[] = {
{"machdev", 'm', 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).";
/* Used to hold data during argument parsing. */
struct store_parse_hook
{
/* A malloced vector of stores specified on the command line, NUM_STORES
long. */
struct store **stores;
size_t num_stores;
/* Pointer to params struct passed in by user. */
struct store_argp_params *params;
off_t interleave; /* --interleave value */
int machdev : 1; /* --machdev specified */
int layer : 1; /* --layer specified */
};
/* Free the parse hook H. If ERR_RETURN is true, also free the stores in H's
store vector, and any other return values, otherwise just free the vector
itself. */
static void
free_hook (struct store_parse_hook *h, int err_return)
{
int i;
if (err_return)
for (i = 0; i < h->num_stores; i++)
store_free (h->stores[i]);
if (h->stores)
free (h->stores);
if (err_return && h->params->return_args && h->params->args)
free (h->params->args);
free (h);
}
static error_t
open_file (char *name, struct store_parse_hook *h, struct store **s)
{
error_t err;
int flags = h->params->flags;
int open_flags = (flags & STORE_HARD_READONLY) ? O_RDONLY : O_RDWR;
file_t node = file_name_lookup (name, open_flags, 0);
if (node == MACH_PORT_NULL)
return errno;
err = store_create (node, flags, 0, s);
if (err)
{
if (! h->params->no_file_io)
/* Try making a store that does file io to NODE. */
err = store_file_create (node, flags, s);
if (err)
mach_port_deallocate (mach_task_self (), node);
}
return err;
}
static error_t
parse_opt (int opt, char *arg, struct argp_state *state)
{
error_t err = 0;
struct store_parse_hook *h = 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)
{
struct store *s;
case 'm':
h->machdev = 1; break;
case 'i':
if (h->layer)
PERR (EINVAL, "--layer and --interleave are exclusive");
if (h->interleave)
/* Actually no reason why we couldn't support this.... */
PERR (EINVAL, "--interleave specified multiple times");
h->interleave = atoi (arg);
if (! h->interleave)
PERR (EINVAL, "%s: Bad value for --interleave", arg);
break;
case 'l':
if (h->interleave)
PERR (EINVAL, "--layer and --interleave are exclusive");
h->layer = 1;
break;
case ARGP_KEY_ARG:
/* A store device to use! */
if (h->machdev)
err = store_device_open (arg, h->params->flags, &s);
else
err = open_file (arg, h, &s);
if (! err)
{
struct store **stores = realloc (h->stores, h->num_stores + 1);
if (stores)
{
stores[h->num_stores++] = s;
h->stores = stores;
if (h->params->return_args)
err = argz_add (&h->params->args, &h->params->args_len, arg);
}
else
err = ENOMEM; /* Just fucking lovely */
}
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. */
h = malloc (sizeof (struct store_parse_hook));
if (! h)
return ENOMEM;
bzero (h, sizeof (struct store_parse_hook));
h->params = state->input;
if (h->params->return_args)
/* Initialiaze the returned argument vector. */
{
h->params->args = 0;
h->params->args_len = 0;
}
state->hook = h;
break;
case ARGP_KEY_ERROR:
/* Parsing error occured, free everything. */
free_hook (h, 1); break;
case ARGP_KEY_SUCCESS:
/* Successfully finished parsing, return a result. */
if (h->num_stores == 0)
{
free_hook (h, 1);
PERR (EINVAL, "No store specified");
}
if (h->params->return_args)
{
if (h->machdev)
err = argz_insert (&h->params->args, &h->params->args_len,
h->params->args, "--machdev");
if (!err && h->num_stores > 1 && (h->interleave || h->layer))
{
char buf[40];
if (h->interleave)
snprintf (buf, sizeof buf, "--interleave=%ld", h->interleave);
else
snprintf (buf, sizeof buf, "--layer=%ld", h->layer);
err = argz_insert (&h->params->args, &h->params->args_len,
h->params->args, buf);
}
}
if (err)
/* nothing */;
else if (state->input == 0)
/* No way to return a value! */
err = EINVAL;
else if (h->num_stores == 1)
s = h->stores[0]; /* Just a single store. */
else if (h->interleave)
err =
store_ileave_create (h->stores, h->num_stores, h->interleave,
h->params->flags, &s);
else if (h->layer)
{
free_hook (h, 1);
PERR (EINVAL, "--layer not implemented");
}
else
err =
store_concat_create (h->stores, h->num_stores, h->params->flags, &s);
free_hook (h, err);
if (! err)
h->params->result = s;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
struct argp
store_argp = { options, parse_opt, args_doc, doc };
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