Initial Spring 2016 commit.

userland/bin/cp/Makefile

@@ -0,0 +1,12 @@
+# Makefile for cp
+
+TOP=../../..
+.include "$(TOP)/mk/os161.config.mk"
+
+PROG=cp
+SRCS=cp.c
+BINDIR=/bin
+
+
+.include "$(TOP)/mk/os161.prog.mk"
+

userland/bin/cp/cp.c

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
+ *	The President and Fellows of Harvard College.
+ *
+ * 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 UNIVERSITY 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 UNIVERSITY 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 <unistd.h>
+#include <err.h>
+
+/*
+ * cp - copy a file.
+ * Usage: cp oldfile newfile
+ */
+
+
+/* Copy one file to another. */
+static
+void
+copy(const char *from, const char *to)
+{
+	int fromfd;
+	int tofd;
+	char buf[1024];
+	int len, wr, wrtot;
+
+	/*
+	 * Open the files, and give up if they won't open
+	 */
+	fromfd = open(from, O_RDONLY);
+	if (fromfd<0) {
+		err(1, "%s", from);
+	}
+	tofd = open(to, O_WRONLY|O_CREAT|O_TRUNC);
+	if (tofd<0) {
+		err(1, "%s", to);
+	}
+
+	/*
+	 * As long as we get more than zero bytes, we haven't hit EOF.
+	 * Zero means EOF. Less than zero means an error occurred.
+	 * We may read less than we asked for, though, in various cases
+	 * for various reasons.
+	 */
+	while ((len = read(fromfd, buf, sizeof(buf)))>0) {
+		/*
+		 * Likewise, we may actually write less than we attempted
+		 * to. So loop until we're done.
+		 */
+		wrtot = 0;
+		while (wrtot < len) {
+			wr = write(tofd, buf+wrtot, len-wrtot);
+			if (wr<0) {
+				err(1, "%s", to);
+			}
+			wrtot += wr;
+		}
+	}
+	/*
+	 * If we got a read error, print it and exit.
+	 */
+	if (len<0) {
+		err(1, "%s", from);
+	}
+
+	if (close(fromfd) < 0) {
+		err(1, "%s: close", from);
+	}
+
+	if (close(tofd) < 0) {
+		err(1, "%s: close", to);
+	}
+}
+
+int
+main(int argc, char *argv[])
+{
+	/*
+	 * Just do it.
+	 *
+	 * We don't allow the Unix model where you can do
+	 *    cp file1 file2 file3 destination-directory
+	 *
+	 * although this would be pretty easy to add.
+	 */
+	if (argc!=3) {
+		errx(1, "Usage: cp OLDFILE NEWFILE");
+	}
+	copy(argv[1], argv[2]);
+	return 0;
+}