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