/*-
 * Copyright (c) 2013-2015 Sandvine Inc.  All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/stdarg.h>

int
vasprintf(char **buf, struct malloc_type *mtp, const char *format, va_list va)
{
        int len, ret;
        va_list tmp_va;
        char dummy;

        va_copy(tmp_va, va);
        len = vsnprintf(&dummy, 0, format, tmp_va);
        va_end(tmp_va);
        if (len < 0) {
                *buf = NULL;
                return (len);
        }

        /* Account for null terminator. */
        len += 1;
        *buf = malloc(len, mtp, M_NOWAIT);
        if (*buf == NULL)
                return (-1);

        ret = vsnprintf(*buf, len, format, va);
        if (ret < 0) {
                free(*buf, mtp);
                *buf = NULL;
        }

        return (ret);
}

int
asprintf(char **buf, struct malloc_type *mtp, const char *format, ...)
{
        int ret;
        va_list va;

        va_start(va, format);
        ret = vasprintf(buf, mtp, format, va);
        va_end(va);

        return (ret);
}