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      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 
     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
    112 vdprintf(int fd, const char * __restrict fmt, va_list ap)
    113 {
    114 	return vdprintf_l(fd, _current_locale(), fmt, ap);
    115 }
    116