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CDEBUG.C
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1986-03-14
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/*
* If you wish to use these macros copy them from [11,1]debug.h
*
*/
/* debug.h - This contains the definition of the debugging macros denter,
* debug, and dleave. In order to invoke the macros the preprocessor
* symbol DEBUG must be defined. If the symbol DEBUG is not defined the
* macros are translated to the NULL statement ';'. Once your debugging
* statements are in place, they do not have to be commented out, or
* deleted from your program in order to suppress the debugging output.
*
* Note one of the modules of your program must have the preprocessor symbol
* MAIN defined. Logically this dictates the module containing the
* main() will be the one defining this symbol. The debugging package
* sets up the GLOBAL symbols D_S and D_I. D_S is the the string of
* blanks that the indents are taken from, and D_I is the current
* indentation level.
*
* Debugging output is directed to the pseudo file descriptor STDBUG. The user
* should direct any of their own debugging output to this file using:
*
* fprintf (STDBUG, fmt, args);
*
* where the fmt is a valid printf family format string, and args is a
* list of arguements satisfying the fmt string. The user can define
* STDERR to any fd, and the debugging output will be redirected to that
* file.
*
* The denter, debug, and dleave are used as follows:
*
* denter(str);
* This will display a message indented two more spaces than what
* currently indented. When used with dleave, this macro provides a
* useful means of tracing the nesting of loops and functions.
*
* debug(x);
*
* This will ensure that indentation is correct and excute the
* function x only when DEBUG is defined. The most comman usage is with
* the function fprintf as:
*
* debug(fprintf(DEBUG,"%x=%d, y=%d\n", x, y));
*
* dleave(str);
*
* This will display a message undented two more spaces than what
* it is currently indented. The dleave call will have no effect it is
* up against the left margin
*
*
* indent();
*
* This will cause the debug output to be indented two more than
* it is already.
*
* undent();
* This will cause the debug output to be undented two more than
* it is already.
*
*/
#ifndef STDBUG
#define STDBUG STDERR
#endif
/* The preprocessor symbol MAIN must be defined in only one of the modules that
* wish to use the debugging macros. It causes the global variables D_I
* and D_S to be properly initialized. If MAIN is not defined then the
* proper external reference to these variables is set.
*/
#define D_L 70
#ifdef MAIN
extern int D_I = 0;
extern char D_S[] =
/*1234567890123456789012345678901234567890123456789012345678901234567890*/
" ";
#else
extern int D_I;
extern char D_S[];
#endif
#ifdef DEBUG
#define indent() (D_I < 35 ? D_I++ : D_I)
#define undent() (D_I > 0 ? --D_I : D_I)
#define INS_INDENT fprintf(STDBUG, "%s", &D_S[D_L - indent()*2])
#define DEL_INDENT fprintf(STDBUG, "%s", &D_S[D_L - undent()*2])
#define INDENT fprintf(STDBUG, "%s", &D_S[D_L-D_I*2])
#define denter(x) (INS_INDENT, fprintf(STDBUG, "entering: %s\n", x))
#define debug(x) (INDENT, x)
#define dleave(x) (DEL_INDENT, fprintf(STDBUG, "leaving: %s\n", x))
/* If DEBUG is not defined then replace the 'calls' to the debugging
* macros by null expressions. ie. ';'.
*/
#else
#define denter(x) ;
#define debug(x) ;
#define dleave(x) ;
#define indent() ;
#define undent() ;
#endif
.
*/
#else
#define denter(x) ;
#define debug(x) ;
#define dleave(x) ;