vdprintf.c revision 1.4 
1/*	$NetBSD: vdprintf.c,v 1.4 2013/05/17 12:55:57 joerg 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 1.4 2013/05/17 12:55:57 joerg 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	if (fdflags & O_NONBLOCK) {
92		struct stat st;
93		if (fstat(fd, &st) == -1)
94			return -1;
95		if (!S_ISREG(st.st_mode)) {
96			errno = EFTYPE;
97			return EOF;
98		}
99	}
100
101	_FILEEXT_SETUP(&f, &fext);
102	__sfpinit(&f);
103	f._p = buf;
104	f._w = sizeof(buf);
105	f._flags = __SWR;
106	f._file = fd;
107	f._bf._base = buf;
108	f._bf._size = sizeof(buf);
109	f._cookie = &f;
110	f._read = NULL;
111	f._write = __swrite;
112	f._seek = NULL;
113	f._close = NULL;
114
115	if ((ret = vfprintf_l(&f, loc, fmt, ap)) < 0)
116		return ret;
117
118	return fflush(&f) ? EOF : ret;
119}
120
121int
122vdprintf(int fd, const char * __restrict fmt, va_list ap)
123{
124	return vdprintf_l(fd, _current_locale(), fmt, ap);
125}
126