/*
 * Copyright 2016 Garrett D'Amore <garrett@damore.org>
 *
 * This software is supplied under the terms of the MIT License, a
 * copy of which should be located in the distribution where this
 * file was obtained (LICENSE.txt).  A copy of the license may also be
 * found online at https://opensource.org/licenses/MIT.
 */

#include <stdlib.h>
#include <string.h>
#include <stdarg.h>

#ifdef  NNG_HAVE_BACKTRACE
#include <execinfo.h>
#endif

#include "core/nng_impl.h"

/*
 * Panic handling.
 */
static void
show_backtrace(void)
{
#if NNG_HAVE_BACKTRACE
	void *frames[50];
	int nframes;
	char **lines;
	int i;

	nframes = backtrace(frames, sizeof (frames) / sizeof (frames[0]));
	if (nframes > 1) {
		lines = backtrace_symbols(frames, nframes);
		if (lines == NULL) {
			return;
		}
		for (i = 1; i < nframes; i++) {
			nni_println(lines[i]);
		}
	}
#endif
}


/*
 * nni_panic shows a panic message, a possible stack bracktrace, then aborts
 * the process/program.  This should only be called when a condition arises
 * that should not be possible, e.g. a programming assertion failure. It should
 * not be called in situations such as ENOMEM, as nni_panic is fairly rude
 * to any application it may be called from within.
 */
void
nni_panic(const char *fmt, ...)
{
	char buf[128];
	char fbuf[128];
	va_list va;

	va_start(va, fmt);
	(void) nni_snprintf(fbuf, sizeof (buf), "panic: %s", fmt);
	(void) nni_vsnprintf(buf, sizeof (buf), fbuf, va);
	va_end(va);

	nni_println(buf);
	nni_println("This message is indicative of a BUG.");
	nni_println("Report this at http://github.com/nanomsg/nanomsg");

	show_backtrace();
	nni_plat_abort();
}


void
nni_println(const char *msg)
{
	/* TODO: support redirection of this later. */
	nni_plat_println(msg);
}