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/*
* Diagnostic builder
* Copyright (C) 1998-2003 D. Hugh Redelmeier
* Copyright (C) 2004 Michael Richardson <mcr@xelerance.com>
*
* alg_info.c,v 1.1.2.1 2003/11/21 18:12:23 jjo Exp
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <stdarg.h>
#include <openswan.h>
#include "constants.h"
#include "oswlog.h"
/* Build up a diagnostic in a static buffer.
* Although this would be a generally useful function, it is very
* hard to come up with a discipline that prevents different uses
* from interfering. It is intended that by limiting it to building
* diagnostics, we will avoid this problem.
* Juggling is performed to allow an argument to be a previous
* result: the new string may safely depend on the old one. This
* restriction is not checked in any way: violators will produce
* confusing results (without crashing!).
*/
char diag_space[sizeof(diag_space)];
/** Build up a diagnostic in a static buffer.
*
* Although this would be a generally useful function, it is very
* hard to come up with a discipline that prevents different uses
* from interfering. It is intended that by limiting it to building
* diagnostics, we will avoid this problem.
* Juggling is performed to allow an argument to be a previous
* result: the new string may safely depend on the old one. This
* restriction is not checked in any way: violators will produce
* confusing results (without crashing!).
*
* @param fmt String format
* @param ... strings
* @return err_t
*/
err_t
builddiag(const char *fmt, ...)
{
static char diag_space[LOG_WIDTH]; /* longer messages will be truncated */
char t[sizeof(diag_space)]; /* build result here first */
va_list args;
va_start(args, fmt);
t[0] = '\0'; /* in case nothing terminates string */
vsnprintf(t, sizeof(t), fmt, args);
va_end(args);
strcpy(diag_space, t);
return diag_space;
}
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