1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libc/stdio/fflush.c b/lib/libc/stdio/fflush.c
new file mode 100644
index 0000000..4a5cf0f
--- /dev/null
+++ b/lib/libc/stdio/fflush.c
@@ -0,0 +1,89 @@
+/*-
+ * 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[] = "@(#)fflush.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include <errno.h>
+#include <stdio.h>
+#include "local.h"
+
+/* Flush a single file, or (if fp is NULL) all files.  */
+fflush(fp)
+	register FILE *fp;
+{
+
+	if (fp == NULL)
+		return (_fwalk(__sflush));
+	if ((fp->_flags & (__SWR | __SRW)) == 0) {
+		errno = EBADF;
+		return (EOF);
+	}
+	return (__sflush(fp));
+}
+
+__sflush(fp)
+	register FILE *fp;
+{
+	register unsigned char *p;
+	register int n, t;
+
+	t = fp->_flags;
+	if ((t & __SWR) == 0)
+		return (0);
+
+	if ((p = fp->_bf._base) == NULL)
+		return (0);
+
+	n = fp->_p - p;		/* write this much */
+
+	/*
+	 * Set these immediately to avoid problems with longjmp and to allow
+	 * exchange buffering (via setvbuf) in user write function.
+	 */
+	fp->_p = p;
+	fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
+
+	for (; n > 0; n -= t, p += t) {
+		t = (*fp->_write)(fp->_cookie, (char *)p, n);
+		if (t <= 0) {
+			fp->_flags |= __SERR;
+			return (EOF);
+		}
+	}
+	return (0);
+}