Libc-320.tar.gz

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

diff --git a/stdio/FreeBSD/fread.c b/stdio/FreeBSD/fread.c
new file mode 100644 (file)
index 0000000..ad5d81b
--- /dev/null
+++ b/stdio/FreeBSD/fread.c
@@ -0,0 +1,91 @@
+/*-
+ * 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[] = "@(#)fread.c    8.2 (Berkeley) 12/11/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/stdio/fread.c,v 1.12 2002/10/12 16:13:37 mike Exp $");
+
+#include "namespace.h"
+#include <stdio.h>
+#include <string.h>
+#include "un-namespace.h"
+#include "local.h"
+#include "libc_private.h"
+
+size_t
+fread(buf, size, count, fp)
+       void * __restrict buf;
+       size_t size, count;
+       FILE * __restrict fp;
+{
+       size_t resid;
+       char *p;
+       int r;
+       size_t total;
+
+       /*
+        * The ANSI standard requires a return value of 0 for a count
+        * or a size of 0.  Peculiarily, it imposes no such requirements
+        * on fwrite; it only requires fread to be broken.
+        */
+       if ((resid = count * size) == 0)
+               return (0);
+       FLOCKFILE(fp);
+       ORIENT(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);
+}