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- /*-
- * 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.
- *
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)stdio.c 5.3 (Berkeley) 2/24/91";
- #endif /* LIBC_SCCS and not lint */
-
- #include <fcntl.h>
- #include <unistd.h>
- #include <stdio.h>
- #include "local.h"
-
- /*
- * Small standard I/O/seek/close functions.
- * These maintain the `known seek offset' for seek optimisation.
- */
- __sread(cookie, buf, n)
- void *cookie;
- char *buf;
- int n;
- {
- register FILE *fp = cookie;
- register int ret;
-
- ret = read(fp->_file, buf, n);
- /* if the read succeeded, update the current offset */
- if (ret >= 0)
- fp->_offset += ret;
- else
- fp->_flags &= ~__SOFF; /* paranoia */
- return (ret);
- }
-
- __swrite(cookie, buf, n)
- void *cookie;
- char const *buf;
- int n;
- {
- register FILE *fp = cookie;
-
- if (fp->_flags & __SAPP)
- (void) lseek(fp->_file, (off_t)0, SEEK_END);
- fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */
- return (write(fp->_file, buf, n));
- }
-
- fpos_t
- __sseek(cookie, offset, whence)
- void *cookie;
- fpos_t offset;
- int whence;
- {
- register FILE *fp = cookie;
- register off_t ret;
-
- ret = lseek(fp->_file, (off_t)offset, whence);
- if (ret == -1L)
- fp->_flags &= ~__SOFF;
- else {
- fp->_flags |= __SOFF;
- fp->_offset = ret;
- }
- return (ret);
- }
-
- __sclose(cookie)
- void *cookie;
- {
-
- return (close(((FILE *)cookie)->_file));
- }
-