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/*

FUNCTION

<<assert>>---Macro for Debugging Diagnostics

INDEX

        assert

ANSI_SYNOPSIS

        #include <assert.h>

        void assert(int <[expression]>);

TRAD_SYNOPSIS

        #include <assert.h>

        assert(<[expression]>)

        int <[expression]>;

DESCRIPTION

        Use this macro to embed debuggging diagnostic statements in

        your programs.  The argument <[expression]> should be an

        expression which evaluates to true (nonzero) when your program

        is working as you intended.

        When <[expression]> evaluates to false (zero), <<assert>>

        calls <<abort>>, after first printing a message showing what

        failed and where:

. Assertion failed: <[expression]>, file <[filename]>, line <[lineno]>

        The macro is defined to permit you to turn off all uses of

        <<assert>> at compile time by defining <<NDEBUG>> as a

        preprocessor variable.   If you do this, the <<assert>> macro

        expands to

. (void(0))

RETURNS

        <<assert>> does not return a value.

PORTABILITY

        The <<assert>> macro is required by ANSI, as is the behavior

        when <<NDEBUG>> is defined.

Supporting OS subroutines required (only if enabled): <<close>>, <<fstat>>,

<<getpid>>, <<isatty>>, <<kill>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#include <assert.h>

#include <stdlib.h>

#include <stdio.h>

void

_DEFUN (__assert, (file, line, failedexpr),

        const char *file _AND

        int line _AND

        const char *failedexpr)

{

  (void)fiprintf(stderr,

        "assertion \"%s\" failed: file \"%s\", line %d\n",

        failedexpr, file, line);

  abort();

  /* NOTREACHED */

}