1 files changed, 123 insertions, 0 deletions
diff --git a/usr.bin/cksum/cksum.c b/usr.bin/cksum/cksum.c
new file mode 100644
index 000000000000..ce69246e1861
--- /dev/null
+++ b/usr.bin/cksum/cksum.c
@@ -0,0 +1,123 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * James W. Williams of NASA Goddard Space Flight Center.
+ *
+ * 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 <sys/types.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "extern.h"
+
+static void usage(void) __dead2;
+
+int
+main(int argc, char **argv)
+{
+	uint32_t val;
+	int ch, fd, rval;
+	off_t len;
+	char *fn, *p;
+	int (*cfncn)(int, uint32_t *, off_t *);
+	void (*pfncn)(char *, uint32_t, off_t);
+
+	if ((p = strrchr(argv[0], '/')) == NULL)
+		p = argv[0];
+	else
+		++p;
+	if (!strcmp(p, "sum")) {
+		cfncn = csum1;
+		pfncn = psum1;
+		++argv;
+	} else {
+		cfncn = crc;
+		pfncn = pcrc;
+
+		while ((ch = getopt(argc, argv, "o:")) != -1)
+			switch (ch) {
+			case 'o':
+				if (!strcmp(optarg, "1")) {
+					cfncn = csum1;
+					pfncn = psum1;
+				} else if (!strcmp(optarg, "2")) {
+					cfncn = csum2;
+					pfncn = psum2;
+				} else if (!strcmp(optarg, "3")) {
+					cfncn = crc32;
+					pfncn = pcrc;
+				} else {
+					warnx("illegal argument to -o option");
+					usage();
+				}
+				break;
+			case '?':
+			default:
+				usage();
+			}
+		argc -= optind;
+		argv += optind;
+	}
+
+	fd = STDIN_FILENO;
+	fn = NULL;
+	rval = 0;
+	do {
+		if (*argv) {
+			fn = *argv++;
+			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
+				warn("%s", fn);
+				rval = 1;
+				continue;
+			}
+		}
+		if (cfncn(fd, &val, &len)) {
+			warn("%s", fn ? fn : "stdin");
+			rval = 1;
+		} else
+			pfncn(fn, val, len);
+		(void)close(fd);
+	} while (*argv);
+	exit(rval);
+}
+
+static void
+usage(void)
+{
+	(void)fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
+	(void)fprintf(stderr, "       sum [file ...]\n");
+	exit(1);
+}