Libc-262.tar.gz

[apple/libc.git] / stdio / stdio.c

diff --git a/stdio/stdio.c b/stdio/stdio.c
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--- /dev/null
+++ b/stdio/stdio.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * 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.
+ */
+
+
+#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.
+ */
+int
+__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);
+}
+
+int
+__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);
+}
+
+int
+__sclose(cookie)
+       void *cookie;
+{
+
+       return (close(((FILE *)cookie)->_file));
+}