1/*	$NetBSD: vdprintf.c,v 1.6 2020/08/28 22:02:24 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37__RCSID("$NetBSD: vdprintf.c,v 1.6 2020/08/28 22:02:24 christos Exp $");
38#endif /* LIBC_SCCS and not lint */
39
40#include "namespace.h"
41#include <sys/types.h>
42
43#include <assert.h>
44#include <errno.h>
45#include <fcntl.h>
46#include <locale.h>
47#include <unistd.h>
48#include <stdio.h>
49#include <limits.h>
50
51#include "reentrant.h"
52#include "setlocale_local.h"
53#include "local.h"
54
55#ifdef __weak_alias
56__weak_alias(vdprintf,_vdprintf)
57__weak_alias(vdprintf_l,_vdprintf_l)
58#endif
59
60int
61vdprintf_l(int fd, locale_t loc, const char * __restrict fmt, va_list ap)
62{
63	FILE f;
64	struct __sfileext fext;
65	unsigned char buf[BUFSIZ];
66	int ret, fdflags, tmp;
67
68	_DIAGASSERT(fd != -1);
69
70	/*
71	 * File descriptors are a full int, but _file is only a short.
72	 * If we get a valid file descriptor that is greater or equal to
73	 * USHRT_MAX, then the fd will get sign-extended into an
74	 * invalid file descriptor.  Handle this case by failing the
75	 * open. (We treat the short as unsigned, and special-case -1).
76	 */
77	if (fd >= USHRT_MAX) {
78		errno = EMFILE;
79		return EOF;
80	}
81
82	if ((fdflags = fcntl(fd, F_GETFL, 0)) == -1)
83		return EOF;
84
85	tmp = fdflags & O_ACCMODE;
86	if (tmp != O_RDWR && tmp != O_WRONLY) {
87		errno = EINVAL;
88		return EOF;
89	}
90
91	_FILEEXT_SETUP(&f, &fext);
92	__sfpinit(&f);
93	f._p = buf;
94	f._w = sizeof(buf);
95	f._flags = __SWR;
96	f._file = fd;
97	f._bf._base = buf;
98	f._bf._size = sizeof(buf);
99	f._cookie = &f;
100	f._read = NULL;
101	f._write = __swrite;
102	f._seek = NULL;
103	f._close = NULL;
104
105	if ((ret = vfprintf_l(&f, loc, fmt, ap)) < 0)
106		return ret;
107
108	return fflush(&f) ? EOF : ret;
109}
110
111int
112vdprintf(int fd, const char * __restrict fmt, va_list ap)
113{
114	return vdprintf_l(fd, _current_locale(), fmt, ap);
115}
116