util.cpp

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/* src/toolbox/util.c - contains some utility functions

   Copyright (C) 1996-2005, 2006, 2008
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   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, or (at
   your option) any later version.

   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.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#include "config.h"

#include <assert.h>
#include <errno.h>
#include <stdarg.h>
#include <unistd.h>

#include "vm/types.hpp"

#include "vm/vm.hpp"


/* get_variable_message_length *************************************************

   This function simluates the print of a variable message and
   determines so the message length;

*******************************************************************************/

int get_variable_message_length(const char *fmt, va_list ap)
{
    int n;

    n = vsnprintf(NULL, 0, fmt, ap);

#if defined(__IRIX__)
    /* We know that IRIX returns -1 if the buffer is NULL */

    if (n == -1) {
        char *p, *np;
        s4    size;

        size = 100;                     /* start with 100-bytes               */

        p = MNEW(char, size);

        while (1) {
            /* Try to print in the allocated space. */

            n = vsnprintf(p, size, fmt, ap);

            /* If that worked, return the length. */
            if (n > -1 && n < size)
                return n;

            /* Else try again with more space. */
            size *= 2;  /* twice the old size */

            if ((np = MREALLOC(p, char, size, size)) == NULL) {
                assert(0);
            } else {
                p = np;
            }
        }
    }
#endif

    return n;
}


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c++
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 */