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/*
* Copyright (C) 2007,2008 Red Hat, Inc. All rights reserved.
*
* Module Author: Heinz Mauelshagen <Mauelshagen@RedHat.de>
*
* General device-mapper message interface argument parser.
*
* This file is released under the GPL.
*
*/
#ifndef DM_MESSAGE_H
#define DM_MESSAGE_H
/* Factor out to dm.h. */
/* Reference to array end. */
#define ARRAY_END(a) ((a) + ARRAY_SIZE(a))
/* Message return bits. */
enum dm_message_return {
dm_msg_ret_ambiguous, /* Action ambiguous. */
dm_msg_ret_inval, /* Action invalid. */
dm_msg_ret_undef, /* Action undefined. */
dm_msg_ret_option, /* Option error. */
dm_msg_ret_arg, /* Argument error. */
dm_msg_ret_argcount, /* Argument count error. */
};
/* Message argument type conversions. */
enum dm_message_argument_type {
dm_msg_base_t, /* Basename string. */
dm_msg_str_t, /* String. */
dm_msg_int_t, /* Signed int. */
dm_msg_uint_t, /* Unsigned int. */
dm_msg_uint64_t, /* Unsigned int 64. */
};
/* A message option. */
struct dm_message_option {
unsigned num_options;
char **options;
unsigned long *actions;
};
/* Message arguments and types. */
struct dm_message_argument {
unsigned num_args;
unsigned long **ptr;
enum dm_message_argument_type types[];
};
/* Client message. */
struct dm_msg {
unsigned long action; /* Identified action. */
unsigned long ret; /* Return bits. */
unsigned num_specs; /* # of sepcifications listed. */
struct dm_msg_spec *specs; /* Specification list. */
struct dm_msg_spec *spec; /* Specification selected. */
};
/* Secification of the message. */
struct dm_msg_spec {
const char *cmd; /* Name of the command (i.e. 'bandwidth'). */
unsigned long action;
struct dm_message_option *options;
struct dm_message_argument *args;
unsigned long parm; /* Parameter to pass through to callback. */
/* Function to process for action. */
int (*f) (struct dm_msg *msg, void *context);
};
/* Parameter access macros. */
#define DM_MSG_PARM(msg) ((msg)->spec->parm)
#define DM_MSG_STR_ARGS(msg, idx) ((char *) *(msg)->spec->args->ptr[idx])
#define DM_MSG_INT_ARGS(msg, idx) ((int) *(msg)->spec->args->ptr[idx])
#define DM_MSG_UINT_ARGS(msg, idx) ((unsigned) DM_MSG_INT_ARG(msg, idx))
#define DM_MSG_UINT64_ARGS(msg, idx) ((uint64_t) *(msg)->spec->args->ptr[idx])
#define DM_MSG_STR_ARG(msg) DM_MSG_STR_ARGS(msg, 0)
#define DM_MSG_INT_ARG(msg) DM_MSG_INT_ARGS(msg, 0)
#define DM_MSG_UINT_ARG(msg) DM_MSG_UINT_ARGS(msg, 0)
#define DM_MSG_UINT64_ARG(msg) DM_MSG_UINT64_ARGS(msg, 0)
/* Parse a message and its options and optionally call a function back. */
int dm_message_parse(const char *caller, struct dm_msg *msg, void *context,
int argc, char **argv);
#endif
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