Switch to upstream OpenBSD fread/fvwrite.
Change-Id: I3dc11083693bc8d99edc0cbcc6f70dc9e5dc6565
diff --git a/libc/upstream-openbsd/lib/libc/stdio/fread.c b/libc/upstream-openbsd/lib/libc/stdio/fread.c
new file mode 100644
index 0000000..430865d
--- /dev/null
+++ b/libc/upstream-openbsd/lib/libc/stdio/fread.c
@@ -0,0 +1,74 @@
+/* $OpenBSD: fread.c,v 1.11 2009/11/21 09:53:44 guenther 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 <stdio.h>
+#include <string.h>
+#include "local.h"
+
+size_t
+fread(void *buf, size_t size, size_t count, FILE *fp)
+{
+ size_t resid;
+ char *p;
+ int r;
+ size_t total;
+
+ /*
+ * ANSI and SUSv2 require a return value of 0 if size or count are 0.
+ */
+ if ((resid = count * size) == 0)
+ return (0);
+ FLOCKFILE(fp);
+ _SET_ORIENTATION(fp, -1);
+ if (fp->_r < 0)
+ fp->_r = 0;
+ total = resid;
+ p = buf;
+ while (resid > (r = fp->_r)) {
+ (void)memcpy((void *)p, (void *)fp->_p, (size_t)r);
+ fp->_p += r;
+ /* fp->_r = 0 ... done in __srefill */
+ p += r;
+ resid -= r;
+ if (__srefill(fp)) {
+ /* no more input: return partial result */
+ FUNLOCKFILE(fp);
+ return ((total - resid) / size);
+ }
+ }
+ (void)memcpy((void *)p, (void *)fp->_p, resid);
+ fp->_r -= resid;
+ fp->_p += resid;
+ FUNLOCKFILE(fp);
+ return (count);
+}