/*- * 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. 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 8.1 (Berkeley) 6/4/93"; #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)); }