75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
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/*
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FUNCTION
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<<assert>>---macro for debugging diagnostics
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INDEX
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assert
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ANSI_SYNOPSIS
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#include <assert.h>
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void assert(int <[expression]>);
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DESCRIPTION
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Use this macro to embed debuggging diagnostic statements in
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your programs. The argument <[expression]> should be an
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expression which evaluates to true (nonzero) when your program
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is working as you intended.
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When <[expression]> evaluates to false (zero), <<assert>>
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calls <<abort>>, after first printing a message showing what
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failed and where:
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. Assertion failed: <[expression]>, file <[filename]>, line <[lineno]>, function: <[func]>
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If the name of the current function is not known (for example,
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when using a C89 compiler that does not understand __func__),
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the function location is omitted.
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The macro is defined to permit you to turn off all uses of
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<<assert>> at compile time by defining <<NDEBUG>> as a
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preprocessor variable. If you do this, the <<assert>> macro
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expands to
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. (void(0))
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RETURNS
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<<assert>> does not return a value.
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PORTABILITY
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The <<assert>> macro is required by ANSI, as is the behavior
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when <<NDEBUG>> is defined.
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Supporting OS subroutines required (only if enabled): <<close>>, <<fstat>>,
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<<getpid>>, <<isatty>>, <<kill>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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/* func can be NULL, in which case no function information is given. */
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void
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_DEFUN (__assert_func, (file, line, func, failedexpr),
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const char *file _AND
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int line _AND
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const char *func _AND
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const char *failedexpr)
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{
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fiprintf(stderr,
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"assertion \"%s\" failed: file \"%s\", line %d%s%s\n",
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failedexpr, file, line,
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func ? ", function: " : "", func ? func : "");
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abort();
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/* NOTREACHED */
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}
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void
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_DEFUN (_assert, (file, line, failedexpr),
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const char *file _AND
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int line _AND
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const char *failedexpr)
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{
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__assert_func (file, line, NULL, failedexpr);
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/* NOTREACHED */
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}
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