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
__weak_alias(vdprintf,_vdprintf)56 __weak_alias(vdprintf,_vdprintf)
57 __weak_alias(vdprintf_l,_vdprintf_l)
58 #endif
59
60 int
61 vdprintf_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
111 int
vdprintf(int fd,const char * __restrict fmt,va_list ap)112 vdprintf(int fd, const char * __restrict fmt, va_list ap)
113 {
114 return vdprintf_l(fd, _current_locale(), fmt, ap);
115 }
116