greg@suntan.viewlogic.com (Gregory Larkin) (05/29/91)
Hi there,
I would like to construct an assertion macro so that I
can print the exact condition that failed as a string.
Here is the way I call the macro:
ASSERT(foo != NULL, "Unexpected NULL pointer");
And here is how it is currently defined:
#define ASSERT(relation, msg) { if(!(relation)) { \
printf("ASSERTION FAILED: File %s Line %d %s\n",\
__FILE__, __LINE__, msg); \
exit(FatalError); } }
I would like to expand the macro so that I can print the message as:
ASSERTION FAILED: foo != NULL, File xxxx Line yyyy Unexpected NULL pointer
How can I print the string "foo != NULL" without passing in the test as
a string. Can I print the test directly as a string somehow?
Thanks for any help,
--
Greg Larkin (ASIC Engineer)|"This is a fragile ball we are living on;
Viewlogic Systems, Inc. |it's a miracle and we are destroying it.."
293 Boston Post Road West |Peter Garrett, Midnight Oil
Marlboro, MA 01752 (greg@Viewlogic.COM)msh30@ruts.ccc.amdahl.com (Mark Hahn) (06/01/91)
>From: greg@suntan.viewlogic.com (Gregory Larkin) > > >Hi there, > >I would like to construct an assertion macro so that I >can print the exact condition that failed as a string. > >Here is the way I call the macro: > >ASSERT(foo != NULL, "Unexpected NULL pointer"); > >And here is how it is currently defined: > >#define ASSERT(relation, msg) { if(!(relation)) { \ > printf("ASSERTION FAILED: File %s Line %d %s\n",\ > __FILE__, __LINE__, msg); \ > exit(FatalError); } } > >I would like to expand the macro so that I can print the message as: > >ASSERTION FAILED: foo != NULL, File xxxx Line yyyy Unexpected NULL pointer > >How can I print the string "foo != NULL" without passing in the test as >a string. Can I print the test directly as a string somehow? > >Thanks for any help, >-- >Greg Larkin (ASIC Engineer)|"This is a fragile ball we are living on; >Viewlogic Systems, Inc. |it's a miracle and we are destroying it.." >293 Boston Post Road West |Peter Garrett, Midnight Oil >Marlboro, MA 01752 (greg@Viewlogic.COM) #define ASSERT_ARG(relation, msg, action) \ if ( !(relation) ) { \ printf("ASSERTION FAILED: File %s Line %d %s %s\n",\ __FILE__, __LINE__, "relation", msg);\ action; \ } /* if assertion failed */ should work in standard C; I'm not sure about ANSI C, though. This version has the advantage of being able to specify a C statement as an action to be taken rather than calling exit(), which is useful if you need to clean up some things first. Usage: ASSERT_ARG( foo != NULL, "Unexpected NULL pointer", cleanup_routine(arg1, arg2, ..., argn) );
mccrady@torolab6.vnet.ibm.com ("Don McCrady") (06/03/91)
>>From: greg@suntan.viewlogic.com (Gregory Larkin) >>I would like to construct an assertion macro so that I >>can print the exact condition that failed as a string. >> ASSERT(foo != NULL, "Unexpected NULL pointer"); >>Greg Larkin (ASIC Engineer) > #define ASSERT_ARG(relation, msg, action) \ > if ( !(relation) ) { \ > printf("ASSERTION FAILED: File %s Line %d %s %s\n",\ > __FILE__, __LINE__, "relation", msg);\ > action; \ > } /* if assertion failed */ > > should work in standard C; I'm not sure about ANSI C, though. > From: msh30@ruts.ccc.amdahl.com (Mark Hahn) No, this won't work in ANSI C... If you use an ANSI C preprocessor, you can do this easily with the "stringize" operator, #... Try this: #define ASSERT_ARG(relation, msg, action) \ if ( !(relation) ) { \ printf("ASSERTION FAILED: " #relation "File %s Line %d %s\n",\ __FILE__, __LINE__, msg); \ action(); \ } Better yet, if you have an ANSI compiler, you should have a header file called <assert.h>, which will do exactly what you want; that is, print the failing assertion, the file and line number, and call the abort() function to terminate the program. Enjoy. ++Don;