39 lines
1 KiB
C
39 lines
1 KiB
C
/* The <assert.h> header contains a macro called "assert" that allows
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* programmers to put assertions in the code. These assertions can be verified
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* at run time. If an assertion fails, an error message is printed and the
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* program aborts.
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* Assertion checking can be disabled by adding the statement
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*
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* #define NDEBUG
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*
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* to the program before the
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*
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* #include <assert.h>
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*
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* statement.
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*/
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#undef assert
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#ifndef _ANSI_H
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#include <ansi.h>
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#endif
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#ifdef NDEBUG
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/* Debugging disabled -- do not evaluate assertions. */
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#define assert(expr) ((void) 0)
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#else
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/* Debugging enabled -- verify assertions at run time. */
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#ifdef _ANSI
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#define __makestr(x) # x
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#define __xstr(x) __makestr(x)
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_PROTOTYPE( void __bad_assertion, (const char *_mess) );
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#define assert(expr) ((expr)? (void)0 : \
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__bad_assertion("Assertion \"" #expr \
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"\" failed, file " __xstr(__FILE__) \
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", line " __xstr(__LINE__) "\n"))
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#else
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#define assert(expr) ((void) ((expr) ? 0 : __assert( __FILE__, __LINE__)))
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#endif /* _ANSI */
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#endif
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