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1234 cejka 1 
/*
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 * Copyright (c) 2006 Josef Cejka
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 * Copyright (c) 2008 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup libc
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 * @{
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 */
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/** @file
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 */
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <io/printf_core.h>
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static int asprintf_str_write(const char *str, size_t count, void *unused)
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{
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    return str_nlength(str, count);
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}
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static int asprintf_wstr_write(const wchar_t *str, size_t count, void *unused)
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{
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    return wstr_nlength(str, count);
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}
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/** Allocate and print to string.
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 *
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 * @param strp Address of the pointer where to store the address of
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 *             the newly allocated string.
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 * @fmt        Format string.
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 *
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 * @return Number of characters printed or a negative error code.
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 *
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 */
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int asprintf(char **strp, const char *fmt, ...)
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{
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    struct printf_spec ps = {
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        asprintf_str_write,
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        asprintf_wstr_write,
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        NULL
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    };
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    va_list args;
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    va_start(args, fmt);
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    int ret = printf_core(fmt, &ps, args);
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    va_end(args);
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    if (ret > 0) {
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        *strp = malloc(STR_BOUNDS(ret) + 1);
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        if (*strp == NULL)
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            return -1;
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        va_start(args, fmt);
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        vsnprintf(*strp, STR_BOUNDS(ret) + 1, fmt, args);
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        va_end(args);
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    }
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    return ret;
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}
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/** @}
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 */