delete zopen(3) from the C library, moved to compress source tree
[unix-history] / usr / src / lib / libc / stdio / fdopen.c
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* %sccs.include.redist.c%
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)fdopen.c 5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include "local.h"
FILE *
fdopen(fd, mode)
int fd;
const char *mode;
{
register FILE *fp;
static int nofile;
int flags, oflags, fdflags, tmp;
if (nofile == 0)
nofile = getdtablesize();
if ((flags = __sflags(mode, &oflags)) == 0)
return (NULL);
/* Make sure the mode the user wants is a subset of the actual mode. */
if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
return (NULL);
tmp = fdflags & O_ACCMODE;
if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
errno = EINVAL;
return (NULL);
}
if ((fp = __sfp()) == NULL)
return (NULL);
fp->_flags = flags;
/*
* If opened for appending, but underlying descriptor does not have
* O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
* end before each write.
*/
if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
fp->_flags |= __SAPP;
fp->_file = fd;
fp->_cookie = fp;
fp->_read = __sread;
fp->_write = __swrite;
fp->_seek = __sseek;
fp->_close = __sclose;
return (fp);
}