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223 lines
13 KiB
C
223 lines
13 KiB
C
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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// % Project : GUSI - Grand Unified Socket Interface
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// % File : GUSIDiag.nw - Assertions and diagnostics
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// % Author : Matthias Neeracher
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// % Language : C++
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// %
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// % $Log: GUSIDiag.h,v $
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// % Revision 1.1 2001/03/11 22:35:00 sgehani%netscape.com
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// % First Checked In.
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// %
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// % Revision 1.12 2000/06/12 04:20:58 neeri
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// % Introduce GUSI_*printf
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// %
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// % Revision 1.11 2000/05/23 06:58:04 neeri
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// % Improve formatting
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// %
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// % Revision 1.10 1999/08/26 05:45:01 neeri
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// % Fixes for literate edition of source code
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// %
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// % Revision 1.9 1999/08/02 07:02:43 neeri
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// % Support for asynchronous errors and other socket options
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// %
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// % Revision 1.8 1999/05/29 06:26:42 neeri
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// % Fixed header guards
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// %
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// % Revision 1.7 1999/04/10 04:45:47 neeri
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// % Add DCon stubs
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// %
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// % Revision 1.6 1999/03/17 09:05:07 neeri
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// % Added GUSITimer, expanded docs
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// %
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// % Revision 1.5 1999/02/25 03:49:00 neeri
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// % Switched to DCon for logging
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// %
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// % Revision 1.4 1998/01/25 20:53:53 neeri
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// % Engine implemented, except for signals & scheduling
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// %
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// % Revision 1.3 1996/12/16 02:17:20 neeri
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// % Tune messages
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// %
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// % Revision 1.2 1996/11/24 12:52:07 neeri
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// % Added GUSIPipeSockets
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// %
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// % Revision 1.1.1.1 1996/11/03 02:43:32 neeri
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// % Imported into CVS
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// %
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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//
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// \chapter{Assertions and diagnostic messages}
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//
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// GUSI reports on three kinds of error conditions:
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//
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// \begin{itemize}
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// \item {\bf Internal} errors are usually caused by bugs in GUSI. They should be
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// considered fatal.
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// \item {\bf Client} errors are caused by calling GUSI routines with bad
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// parameters. They are typically handled by returning an appropriate error
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// code.
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// \item {\bf External} errors are caused by various OS and Network related
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// problems. Typically, they are also handled by returning an appropriate
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// error code.
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// \end{itemize}
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//
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// If you feel lucky, you can turn off the checking for internal and client errors,
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// but external errors will always be checked.
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//
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// <GUSIDiag.h>=
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#ifndef _GUSIDiag_
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#define _GUSIDiag_
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#include <sys/cdefs.h>
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#include <stdarg.h>
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#include <string.h>
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#include <MacTypes.h>
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__BEGIN_DECLS
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// \section{Definition of diagnostics}
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//
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// Depending on the diagnostic level, messages get printed to the DCon console.
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//
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// <Definition of diagnostic logfile>=
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extern char * GUSI_diag_log;
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// Printing is done by passing an argument list to [[GUSI_log]]. To simplify the job
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// for the diagnostic macros, [[GUSI_log]] returns a [[bool]] value which is
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// always [[false]]. [[GUSI_break]] stops with a [[DebugStr]] call. [[GUSI_pos]]
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// establishes the source code position for diagnostic messages.
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// instead of logging.
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//
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// <Definition of diagnostic logfile>=
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bool GUSI_pos(const char * file, int line);
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bool GUSI_log(const char * format, ...);
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bool GUSI_break(const char * format, ...);
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// There are four levels of diagnostic handling:
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// \begin{itemize}
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// \item [[GUSI_DIAG_RECKLESS]] totally ignores all internal and client errors. This
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// setting is not recommended.
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// \item [[GUSI_DIAG_RELAXED]] ignores internal errors, but checks client errors. This
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// setting is probably the best for production code.
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// \item [[GUSI_DIAG_CAUTIOUS]] checks and logs internal and client errors. This
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// setting is best for GUSI client development.
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// \item [[GUSI_DIAG_PARANOID]] immediately stops at internal errors, checks and
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// logs client and external errors. This is the preferred setting for GUSI
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// internal development.
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// \end{itemize}
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//
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//
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// <Definition of diagnostic levels>=
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#define GUSI_DIAG_RECKLESS 0
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#define GUSI_DIAG_RELAXED 1
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#define GUSI_DIAG_CAUTIOUS 2
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#define GUSI_DIAG_PARANOID 3
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// [[GUSI_DIAG]] is defined to the diagnostic level. It can be overridden on a
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// module by module basis, or by changing the default setting here.
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// [[GUSI_MESSAGE_LEVEL]] determines how important a message has to be to print it.
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// [[GUSI_LOG_POS]] determines whether we want to log the code position.
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//
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// <Definition of diagnostic levels>=
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#ifndef GUSI_DIAG
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#define GUSI_DIAG GUSI_DIAG_PARANOID
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#endif
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#ifndef GUSI_LOG_POS
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#define GUSI_LOG_POS 0
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#endif
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#ifndef GUSI_MESSAGE_LEVEL
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#define GUSI_MESSAGE_LEVEL 3
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#endif
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// <Definition of diagnostics>=
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#if GUSI_LOG_POS
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#define GUSI_POS GUSI_pos(__FILE__, __LINE__)
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#define GUSI_LOG GUSI_POS || GUSI_log
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#else
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#define GUSI_LOG GUSI_log
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#endif
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#define GUSI_BREAK GUSI_break
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// <Definition of diagnostics>=
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#if GUSI_DIAG == GUSI_DIAG_RECKLESS
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// [[GUSI_DIAG_RECKLESS]] only checks for external errors.
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//
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// <Diagnostics for [[GUSI_DIAG_RECKLESS]]>=
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#define GUSI_ASSERT_INTERNAL(COND, ARGLIST) true
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#define GUSI_ASSERT_CLIENT(COND, ARGLIST) true
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#define GUSI_ASSERT_EXTERNAL(COND, ARGLIST) (COND)
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#define GUSI_SASSERT_INTERNAL(COND, MSG) true
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#define GUSI_SASSERT_CLIENT(COND, MSG) true
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#define GUSI_SASSERT_EXTERNAL(COND, MSG) (COND)
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#elif GUSI_DIAG == GUSI_DIAG_RELAXED
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// [[GUSI_DIAG_RELAXED]] ignores internal errors, but checks client errors.
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//
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// <Diagnostics for [[GUSI_DIAG_RELAXED]]>=
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#define GUSI_ASSERT_INTERNAL(COND, ARGLIST) true
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#define GUSI_ASSERT_CLIENT(COND, ARGLIST) (COND)
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#define GUSI_ASSERT_EXTERNAL(COND, ARGLIST) (COND)
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#define GUSI_SASSERT_INTERNAL(COND, MSG) true
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#define GUSI_SASSERT_CLIENT(COND, MSG) (COND)
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#define GUSI_SASSERT_EXTERNAL(COND, MSG) (COND)
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#elif GUSI_DIAG == GUSI_DIAG_CAUTIOUS
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// [[GUSI_DIAG_CAUTIOUS]] checks and logs internal and client errors.
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//
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// <Diagnostics for [[GUSI_DIAG_CAUTIOUS]]>=
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#define GUSI_ASSERT_INTERNAL(COND, ARGLIST) ((COND) || GUSI_LOG ARGLIST)
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#define GUSI_ASSERT_CLIENT(COND, ARGLIST) ((COND) || GUSI_LOG ARGLIST)
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#define GUSI_ASSERT_EXTERNAL(COND, ARGLIST) (COND)
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#define GUSI_SASSERT_INTERNAL(COND, MSG) ((COND) || GUSI_LOG ("%s", MSG))
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#define GUSI_SASSERT_CLIENT(COND, MSG) ((COND) || GUSI_LOG ("%s", MSG))
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#define GUSI_SASSERT_EXTERNAL(COND, MSG) (COND)
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#elif GUSI_DIAG == GUSI_DIAG_PARANOID
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// [[GUSI_DIAG_PARANOID]] immediately stops at internal errors, checks and
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// logs client and external errors.
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//
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// <Diagnostics for [[GUSI_DIAG_PARANOID]]>=
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#define GUSI_ASSERT_INTERNAL(COND, ARGLIST) ((COND) || GUSI_BREAK ARGLIST)
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#define GUSI_ASSERT_CLIENT(COND, ARGLIST) ((COND) || GUSI_LOG ARGLIST)
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#define GUSI_ASSERT_EXTERNAL(COND, ARGLIST) ((COND) || GUSI_LOG ARGLIST)
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#define GUSI_SASSERT_INTERNAL(COND, MSG) ((COND) || GUSI_BREAK ("%s", (MSG)))
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#define GUSI_SASSERT_CLIENT(COND, MSG) ((COND) || GUSI_LOG ("%s", MSG))
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#define GUSI_SASSERT_EXTERNAL(COND, MSG) ((COND) || GUSI_LOG ("%s", MSG))
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#else
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#error "GUSI_DIAG defined to illegal value: " GUSI_DIAG
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#endif
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// There are 11 different diagnostic macros. [[GUSI_ASSERT_INTERNAL]],
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// [[GUSI_ASSERT_CLIENT]] and [[GUSI_ASSERT_EXTERNAL]] check for internal,
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// client, and external errors, respectively. Their first argument is a
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// conditional expression which when [[false]] indicates that an error
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// happened. [[GUSI_MESSAGE]] has the same logging status as
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// [[GUSI_ASSERT_EXTERNAL]], but does not check any conditions. The [[SASSERT]]
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// and [[SMESSAGE]] variants do the same checking, but only take a simple
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// message instead of an argument list. The [[CASSERT]] variants simply output
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// the condition as the message.
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//
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// <Definition of diagnostics>=
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#define GUSI_CASSERT_INTERNAL(COND) \
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GUSI_SASSERT_INTERNAL(COND, "(" #COND ") -- assertion failed.\n" )
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#define GUSI_CASSERT_CLIENT(COND) \
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GUSI_SASSERT_CLIENT(COND, "(" #COND ") -- assertion failed.\n" )
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#define GUSI_CASSERT_EXTERNAL(COND) \
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GUSI_SASSERT_EXTERNAL(COND, "(" #COND ") -- assertion failed.\n" )
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#define GUSI_MESSAGE1(ARGLIST) \
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GUSI_ASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>1, ARGLIST)
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#define GUSI_SMESSAGE1(MSG) \
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GUSI_SASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>1, MSG)
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#define GUSI_MESSAGE2(ARGLIST) \
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GUSI_ASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>2, ARGLIST)
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#define GUSI_SMESSAGE2(MSG) \
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GUSI_SASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>2, MSG)
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#define GUSI_MESSAGE3(ARGLIST) \
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GUSI_ASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>3, ARGLIST)
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#define GUSI_SMESSAGE3(MSG) \
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GUSI_SASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>3, MSG)
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#define GUSI_MESSAGE4(ARGLIST) \
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GUSI_ASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>4, ARGLIST)
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#define GUSI_SMESSAGE4(MSG) \
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GUSI_SASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>4, MSG)
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#define GUSI_MESSAGE5(ARGLIST) \
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GUSI_ASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>5, ARGLIST)
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#define GUSI_SMESSAGE5(MSG) \
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GUSI_SASSERT_EXTERNAL(GUSI_MESSAGE_LEVEL>5, MSG)
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#define GUSI_MESSAGE(ARGLIST) GUSI_MESSAGE3(ARGLIST)
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#define GUSI_SMESSAGE(MSG) GUSI_SMESSAGE3(MSG)
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__END_DECLS
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#endif /* _GUSIDiag_ */
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