1 /* $NetBSD: vdprintf.c,v 1.5 2017/01/10 17:45:12 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 1.5 2017/01/10 17:45:12 christos Exp $"); 38 #endif /* LIBC_SCCS and not lint */ 39 40 #include "namespace.h" 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 44 #include <assert.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <locale.h> 48 #include <unistd.h> 49 #include <stdio.h> 50 #include <limits.h> 51 52 #include "reentrant.h" 53 #include "setlocale_local.h" 54 #include "local.h" 55 56 #ifdef __weak_alias 57 __weak_alias(vdprintf,_vdprintf) 58 __weak_alias(vdprintf_l,_vdprintf_l) 59 #endif 60 61 int 62 vdprintf_l(int fd, locale_t loc, const char * __restrict fmt, va_list ap) 63 { 64 FILE f; 65 struct __sfileext fext; 66 unsigned char buf[BUFSIZ]; 67 int ret, fdflags, tmp; 68 69 _DIAGASSERT(fd != -1); 70 71 /* 72 * File descriptors are a full int, but _file is only a short. 73 * If we get a valid file descriptor that is greater or equal to 74 * USHRT_MAX, then the fd will get sign-extended into an 75 * invalid file descriptor. Handle this case by failing the 76 * open. (We treat the short as unsigned, and special-case -1). 77 */ 78 if (fd >= USHRT_MAX) { 79 errno = EMFILE; 80 return EOF; 81 } 82 83 if ((fdflags = fcntl(fd, F_GETFL, 0)) == -1) 84 return EOF; 85 86 tmp = fdflags & O_ACCMODE; 87 if (tmp != O_RDWR && tmp != O_WRONLY) { 88 errno = EINVAL; 89 return EOF; 90 } 91 92 if (fdflags & O_NONBLOCK) { 93 struct stat st; 94 if (fstat(fd, &st) == -1) 95 return -1; 96 if (!S_ISREG(st.st_mode)) { 97 errno = EFTYPE; 98 return EOF; 99 } 100 } 101 102 _FILEEXT_SETUP(&f, &fext); 103 __sfpinit(&f); 104 f._p = buf; 105 f._w = sizeof(buf); 106 f._flags = __SWR; 107 f._file = fd; 108 f._bf._base = buf; 109 f._bf._size = sizeof(buf); 110 f._cookie = &f; 111 f._read = NULL; 112 f._write = __swrite; 113 f._seek = NULL; 114 f._close = NULL; 115 116 if ((ret = vfprintf_l(&f, loc, fmt, ap)) < 0) 117 return ret; 118 119 return fflush(&f) ? EOF : ret; 120 } 121 122 int 123 vdprintf(int fd, const char * __restrict fmt, va_list ap) 124 { 125 return vdprintf_l(fd, _current_locale(), fmt, ap); 126 } 127