minix/lib/nbsd_libc/stdio/vdprintf.c

117 lines
3.3 KiB
C
Raw Normal View History

/* $NetBSD: vdprintf.c,v 1.1 2010/09/06 14:52:55 christos Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: vdprintf.c,v 1.1 2010/09/06 14:52:55 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <limits.h>
#include "reentrant.h"
#include "local.h"
#ifdef __weak_alias
__weak_alias(vdprintf,_vdprintf)
#endif
int
vdprintf(int fd, const char * __restrict fmt, _BSD_VA_LIST_ ap)
{
FILE f;
struct __sfileext fext;
unsigned char buf[BUFSIZ];
int ret, fdflags, tmp;
_DIAGASSERT(fd != -1);
/*
* File descriptors are a full int, but _file is only a short.
* If we get a valid file descriptor that is greater or equal to
* USHRT_MAX, then the fd will get sign-extended into an
* invalid file descriptor. Handle this case by failing the
* open. (We treat the short as unsigned, and special-case -1).
*/
if (fd >= USHRT_MAX) {
errno = EMFILE;
return EOF;
}
if ((fdflags = fcntl(fd, F_GETFL, 0)) == -1)
return EOF;
tmp = fdflags & O_ACCMODE;
if (tmp != O_RDWR && tmp != O_WRONLY) {
errno = EINVAL;
return EOF;
}
if (fdflags & O_NONBLOCK) {
struct stat st;
if (fstat(fd, &st) == -1)
return -1;
if (!S_ISREG(st.st_mode)) {
errno = EFTYPE;
return EOF;
}
}
_FILEEXT_SETUP(&f, &fext);
__sfpinit(&f);
f._p = buf;
f._w = sizeof(buf);
f._flags = __SWR;
f._file = fd;
f._bf._base = buf;
f._bf._size = sizeof(buf);
f._cookie = &f;
f._read = NULL;
f._write = __swrite;
f._seek = NULL;
f._close = NULL;
if ((ret = vfprintf(&f, fmt, ap)) < 0)
return ret;
return fflush(&f) ? EOF : ret;
}