Libc-498.tar.gz

[apple/libc.git] / stdio / fwrite-fbsd.c

diff --git a/stdio/fwrite-fbsd.c b/stdio/fwrite-fbsd.c
new file mode 100644 (file)
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--- /dev/null
+++ b/stdio/fwrite-fbsd.c
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+/*-
+ * 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[] = "@(#)fwrite.c   8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/stdio/fwrite.c,v 1.11 2002/10/12 16:13:41 mike Exp $");
+
+#include "namespace.h"
+#include <stdio.h>
+#include "un-namespace.h"
+#include "local.h"
+#include "fvwrite.h"
+#include "libc_private.h"
+
+/*
+ * Write `count' objects (each size `size') from memory to the given file.
+ * Return the number of whole objects written.
+ */
+size_t
+fwrite(buf, size, count, fp)
+       const void * __restrict buf;
+       size_t size, count;
+       FILE * __restrict fp;
+{
+       size_t n;
+       struct __suio uio;
+       struct __siov iov;
+
+       iov.iov_base = (void *)buf;
+       uio.uio_resid = iov.iov_len = n = count * size;
+
+#if __DARWIN_UNIX03
+       if (n == 0)             /* POSIX */
+               return 0;
+#endif /* __DARWIN_UNIX03 */
+       uio.uio_iov = &iov;
+       uio.uio_iovcnt = 1;
+
+       FLOCKFILE(fp);
+       ORIENT(fp, -1);
+       /*
+        * The usual case is success (__sfvwrite returns 0);
+        * skip the divide if this happens, since divides are
+        * generally slow and since this occurs whenever size==0.
+        */
+       if (__sfvwrite(fp, &uio) != 0)
+           count = (n - uio.uio_resid) / size;
+       FUNLOCKFILE(fp);
+       return (count);
+}