4.3BSD/usr/include/assert.h

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/*	assert.h	4.2	85/01/21	*/

# ifndef NDEBUG
# define _assert(ex)	{if (!(ex)){fprintf(stderr,"Assertion failed: file \"%s\", line %d\n", __FILE__, __LINE__);exit(1);}}
# define assert(ex)	_assert(ex)
# else
# define _assert(ex)
# define assert(ex)
# endif