/*
FUNCTION
<<assert>>---macro for debugging diagnostics
INDEX
assert
ANSI_SYNOPSIS
#include <assert.h>
void assert(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]>, function: <[func]>
If the name of the current function is not known (for example,
when using a C89 compiler that does not understand __func__),
the function location is omitted.
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>
/* func can be NULL, in which case no function information is given. */
void
_DEFUN (__assert_func, (file, line, func, failedexpr),
const char *file _AND
int line _AND
const char *func _AND
const char *failedexpr)
{
fiprintf(stderr,
"assertion \"%s\" failed: file \"%s\", line %d%s%s\n",
failedexpr, file, line,
func ? ", function: " : "", func ? func : "");
/* NOTREACHED */
}
void
_DEFUN (_assert, (file, line, failedexpr),
const char *file _AND
int line _AND
const char *failedexpr)
{
__assert_func (file, line, NULL, failedexpr);
/* NOTREACHED */
}