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/*
* Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
*
* This software may be freely used, copied, modified, and distributed
* provided that the above copyright notice is preserved in all copies of the
* software.
*/
/* -*-C-*-
*
* $Revision$
* $Date$
*
*
* msgbuild.h - utilities for assembling and interpreting ADP messages
*/
#ifndef angel_msgbuild_h
#define angel_msgbuild_h
#include <stdarg.h>
#include "channels.h"
/*
* msgbuild
* --------
* We use a "varargs" function to enable a description of how the
* final message should look to be provided. We use a function rather
* than in-line macros to keep the size of Angel small.
*
* The "buffer" pointer is the starting point from where the data will
* be written. Note: If a NULL pointer is passed then no data will be
* written, but the size information will be returned. This allows
* code to call this routine with a NULL "buffer" pointer to ascertain
* whether the pointer they are passing contains enough space for the
* message being constructed.
*
* The "format" string should contain sequences of the following
* tokens:
* %w - insert 32bit word value
* %p - insert 32bit target pointer value
* %h - insert 16bit value
* %b - insert 8bit byte value
*
* The return parameter is the final byte length of the data written.
*/
unsigned int msgbuild(unsigned char *buffer, const char *format, ...);
unsigned int vmsgbuild(unsigned char *buffer, const char *format,
va_list args);
/*---------------------------------------------------------------------------*/
/*
* msgsend
* -------
* As for msgbuild except that it allocates a buffer, formats the data as
* for msgbuild and transmits the packet. Returns 0 if successful non 0 if ot
* fails.
* Not for use on cooked channels e.g. debug channels only.
*/
extern int msgsend(ChannelID chan, const char *format, ...);
/*---------------------------------------------------------------------------*/
/*
* Unpack_message
* --------------
* This basically does the opposite of msg_build, it takes a message, and
* a scanf type format string (but much cut down functionality) and returns
* the arguments in the message.
*/
extern unsigned int unpack_message(unsigned char *buffer, const char *format, ...);
#endif /* ndef angel_msgbuild_h */
/* EOF msgbuild.h */
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