1 files changed, 90 insertions, 0 deletions
diff --git a/libc/stdio/stdio.c b/libc/stdio/stdio.c
new file mode 100644
index 0000000..13b9887
--- /dev/null
+++ b/libc/stdio/stdio.c
@@ -0,0 +1,90 @@
+/*	$OpenBSD: stdio.c,v 1.9 2005/08/08 08:05:36 espie Exp $ */
+/*-
+ * 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. 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 <errno.h>
+#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(void *cookie, char *buf, int n)
+{
+	FILE *fp = cookie;
+	int ret;
+	
+	ret = TEMP_FAILURE_RETRY(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(void *cookie, const char *buf, int n)
+{
+	FILE *fp = cookie;
+
+	if (fp->_flags & __SAPP)
+		(void) TEMP_FAILURE_RETRY(lseek(fp->_file, (off_t)0, SEEK_END));
+	fp->_flags &= ~__SOFF;	/* in case FAPPEND mode is set */
+	return TEMP_FAILURE_RETRY(write(fp->_file, buf, n));
+}
+
+fpos_t
+__sseek(void *cookie, fpos_t offset, int whence)
+{
+	FILE *fp = cookie;
+	off_t ret;
+	
+	ret = TEMP_FAILURE_RETRY(lseek(fp->_file, (off_t)offset, whence));
+	if (ret == (off_t)-1)
+		fp->_flags &= ~__SOFF;
+	else {
+		fp->_flags |= __SOFF;
+		fp->_offset = ret;
+	}
+	return (ret);
+}
+
+int
+__sclose(void *cookie)
+{
+	return TEMP_FAILURE_RETRY(close(((FILE *)cookie)->_file));
+}