fdopen.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1989 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.4 */
/*LINTLIBRARY*/
/*
* Unix routine to do an "fopen" on file descriptor
* The mode has to be repeated because you can't query its
* status
*/
#include <stdio.h>
#include <sys/errno.h>
extern int errno;
extern long lseek();
extern FILE *_findiop();
FILE *
fdopen(fd, mode)
int fd;
register char *mode;
{
static int nofile = -1;
register FILE *iop;
if(nofile < 0)
nofile = getdtablesize();
if(fd < 0 || fd >= nofile) {
errno = EINVAL;
return(NULL);
}
if((iop = _findiop()) == NULL)
return(NULL);
iop->_cnt = 0;
iop->_file = fd;
iop->_base = iop->_ptr = NULL;
iop->_bufsiz = 0;
switch(*mode) {
case 'r':
iop->_flag = _IOREAD;
break;
case 'a':
(void) lseek(fd, 0L, 2);
/* No break */
case 'w':
iop->_flag = _IOWRT;
break;
default:
errno = EINVAL;
return(NULL);
}
if(mode[1] == '+')
iop->_flag = _IORW;
return(iop);
}