/*      $NetBSD: vdprintf.c,v 1.6 2020/08/28 22:02:24 christos Exp $    */

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: vdprintf.c,v 1.6 2020/08/28 22:02:24 christos Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <sys/types.h>

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <unistd.h>
#include <stdio.h>
#include <limits.h>

#include "reentrant.h"
#include "setlocale_local.h"
#include "local.h"

#ifdef __weak_alias
__weak_alias(vdprintf,_vdprintf)
__weak_alias(vdprintf_l,_vdprintf_l)
#endif

int
vdprintf_l(int fd, locale_t loc, const char * __restrict fmt, va_list ap)
{
        FILE f;
        struct __sfileext fext;
        unsigned char buf[BUFSIZ];
        int ret, fdflags, tmp;

        _DIAGASSERT(fd != -1);

        /*
         * File descriptors are a full int, but _file is only a short.
         * If we get a valid file descriptor that is greater or equal to
         * USHRT_MAX, then the fd will get sign-extended into an
         * invalid file descriptor.  Handle this case by failing the
         * open. (We treat the short as unsigned, and special-case -1).
         */
        if (fd >= USHRT_MAX) {
                errno = EMFILE;
                return EOF;
        }

        if ((fdflags = fcntl(fd, F_GETFL, 0)) == -1)
                return EOF;

        tmp = fdflags & O_ACCMODE;
        if (tmp != O_RDWR && tmp != O_WRONLY) {
                errno = EINVAL;
                return EOF;
        }

        _FILEEXT_SETUP(&f, &fext);
        __sfpinit(&f);
        f._p = buf;
        f._w = sizeof(buf);
        f._flags = __SWR;
        f._file = fd;
        f._bf._base = buf;
        f._bf._size = sizeof(buf);
        f._cookie = &f;
        f._read = NULL;
        f._write = __swrite;
        f._seek = NULL;
        f._close = NULL;

        if ((ret = vfprintf_l(&f, loc, fmt, ap)) < 0)
                return ret;

        return fflush(&f) ? EOF : ret;
}

int
vdprintf(int fd, const char * __restrict fmt, va_list ap)
{
        return vdprintf_l(fd, _current_locale(), fmt, ap);
}