Re: Proposal: /etc /usr/etc /usr/local/etc
Hi,
>>"Vadim" == Vadim Vygonets <vadik@cs.huji.ac.il> writes:
Vadim> But putting { } (blocks) in a macro isn't possible, as far as
Vadim> I know. We need { } anyway, regardles of wether we use malloc.
Oh, pish. Here's an excerpt from my basic Debugging
header. Look at the begin and end blocks.
manoj
/*
* Macros are dangerous if they use an if--then--else control statement,
* because they may be used in an if--then--else control statement
* themselsves, and should be enclosed in the following block to prevent
* problems (like dangling else statements).
*/
#ifdef BEGIN_BLOCK
#undef BEGIN_BLOCK
#endif /* BEGIN_BLOCK */
#ifdef END_BLOCK
#undef END_BLOCK
#endif /* END_BLOCK */
#define BEGIN_BLOCK do {
#define END_BLOCK } while (0)
/* Debugging */
/*
* DEBUGMASK provides explicit control over which debug levels are to be
* turned on, ie, DEBUGMASK = 0xFFFFFFFFL gives 32 DEBUG levels (all on);
* DEBUGMASK = 0x00000001L turns on level 1, DEBUGMASK = 0x00000009L
* turns on level 1 and 4, and so on.
*/
#ifndef DEBUGMASK
# define DEBUGMASK 0xFFFFFFFFL /* 32 DEBUG levels (all on) */
#else
# ifndef DEBUG
# define DEBUG 1 /* default level, in case the user did */
/* not turn it on*/
# endif
#endif
/* DEBUG takes integral values >= 0 */
#ifdef DEBUG
#define MAX_DEBUGLEVEL 32
/*
* A drop in replacement for assert.h
*/
#define ASSERT(expr)\
BEGIN_BLOCK \
if(!(expr)) /* so assert is false*/ \
{\
fprintf(stderr,(char *)"------------------------------------------\n");\
fprintf (stderr, (char *)"D %s(%d):\n\tAssert failed, %s\n", __FILE__,\
__LINE__, #expr);\
exit (33); /* a nice , non standard value*/ \
}\
END_BLOCK
/* Macro to print debug messages. example pargs is
* (stderr, "%s", "abcd"). Level takes values 1 to 32
* All messages at or below level DEBUG are suppressed. Assigning
* a high value for DEBUG ( = 32 ) can suppress all the messages.
*/
#define DEBUGMSG(level, pargs) \
BEGIN_BLOCK \
if (level && (level >= DEBUG) && (DEBUGMASK & \
(unsigned long int)(level <MAX_DEBUGLEVEL ? 1 << (level - 1): \
1 << (level % MAX_DEBUGLEVEL)))) \
fprintf pargs; \
END_BLOCK
#define DEBUGN(level,pargs) \
BEGIN_BLOCK\
if(level && (level >= DEBUG && (DEBUGMASK & \
(unsigned long int)(level <MAX_DEBUGLEVEL ? 1 << (level - 1): \
1 << (level % MAX_DEBUGLEVEL))))) \
{\
/* that is, this is a a valid debug statement */ \
fprintf(stderr,(char *)"------------------------------------------\n");\
fprintf(stderr,(char *)"D %s(%d):[%d]\n\t", __FILE__,__LINE__,level);\
fprintf pargs;\
fprintf(stderr,(char *)"\n");\
}\
END_BLOCK
#define DEBUG0(level,str) DEBUGN(level, (stderr,str))
#define DEBUG1(level,str,a1) DEBUGN(level, (stderr,str,a1))
#define DEBUG2(level,str,a1,a2) DEBUGN(level, (stderr,str,a1,a2))
#define DEBUG3(level,str,a1,a2,a3) DEBUGN(level, (stderr,str,a1,a2,a3))
#define DEBUG4(level,str,a1,a2,a3,a4) DEBUGN(level, (stderr,str,a1,a2,a3,a4))
#define DEBUG5(level,str,a1,a2,a3,a4,a5) \
DEBUGN(level, (stderr,str,a1,a2,a3,a4,a5))
#else /* DEBUG not defined */
#define DEBUGMSG(level, pargs)
#ifdef DEBUGMASK
# undef DEBUGMASK
# define DEBUGMASK /* remove the definition */
#endif /* DEBUGMASK */
#define ASSERT(expr)
#define DEBUG0(level,s)
#define DEBUG1(level,s,a1)
#define DEBUG2(level,s,a1,a2)
#define DEBUG3(level,s,a1,a2,a3)
#define DEBUG4(level,s,a1,a2,a3,a4)
#define DEBUG5(level,s,a1,a2,a3,a4,a5)
#define DEBUGN(level,pargs)
#endif /* DEBUG */
--
Monty Python "In accordance with our principles of free enterprise
and healthy competition, I'm going to ask you two to fight to the
death for it."
Manoj Srivastava <url:mailto:srivasta@acm.org>
Mobile, Alabama USA <url:http://www.datasync.com/%7Esrivasta/>
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