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