source: mainline/uspace/lib/libc/generic/io/asprintf.c@ ab00d5a

/*
 * Copyright (c) 2006 Josef Cejka
 * Copyright (c) 2008 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <io/printf_core.h>

static int asprintf_prewrite(const char *str, size_t count, void *unused)
{
        return count;
}

int asprintf(char **strp, const char *fmt, ...)
{
        struct printf_spec ps = {
                 asprintf_prewrite,
                 NULL
        };
        int ret;
        va_list args;

        va_start(args, fmt);
        ret = printf_core(fmt, &ps, args);
        va_end(args);
        if (ret > 0) {
                *strp = malloc(ret + 20);
                if (!*strp)
                        return -1;
                va_start(args, fmt);
                vsprintf(*strp, fmt, args);
                va_end(args);           
        }

        return ret;
}

/** @}
 */