Initial Spring 2016 commit.

userland/testbin/hash/Makefile

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+# Makefile for hash
+
+TOP=../../..
+.include "$(TOP)/mk/os161.config.mk"
+
+PROG=hash
+SRCS=hash.c
+BINDIR=/testbin
+HOSTBINDIR=/hostbin
+
+.include "$(TOP)/mk/os161.prog.mk"
+.include "$(TOP)/mk/os161.hostprog.mk"
+

userland/testbin/hash/hash.c

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+/*
+ * 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.
+ */
+
+/*
+ * hash: Takes a file and computes a "hash" value by adding together all
+ * the values in the file mod some largish prime.
+ *
+ * Once the basic system calls are complete, this should work on any
+ * file the system supports. However, it's probably of most use for
+ * testing your file system code.
+ *
+ * This should really be replaced with a real hash, like MD5 or SHA-1.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <err.h>
+
+#ifdef HOST
+#include "hostcompat.h"
+#endif
+
+#define HASHP 104729
+
+int
+main(int argc, char *argv[])
+{
+	int fd;
+	char readbuf[1];
+	int j = 0;
+
+#ifdef HOST
+	hostcompat_init(argc, argv);
+#endif
+
+	if (argc != 2) {
+		errx(1, "Usage: hash filename");
+	}
+
+	fd = open(argv[1], O_RDONLY, 0664);
+
+	if (fd<0) {
+		err(1, "%s", argv[1]);
+	}
+
+	for (;;) {
+		if (read(fd, readbuf, 1) <= 0) break;
+		j = ((j*8) + (int) readbuf[0]) % HASHP;
+	}
+
+	close(fd);
+
+	printf("Hash : %d\n", j);
+
+	return 0;
+}