From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 3 Jan 2015 13:58:15 +0100
Subject: patch to Vanilla Tomato 1.28

---
 release/src/router/busybox/coreutils/sum.c | 99 ++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 release/src/router/busybox/coreutils/sum.c

(limited to 'release/src/router/busybox/coreutils/sum.c')

diff --git a/release/src/router/busybox/coreutils/sum.c b/release/src/router/busybox/coreutils/sum.c
new file mode 100644
index 00000000..60f3b300
--- /dev/null
+++ b/release/src/router/busybox/coreutils/sum.c
@@ -0,0 +1,99 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * sum -- checksum and count the blocks in a file
+ *     Like BSD sum or SysV sum -r, except like SysV sum if -s option is given.
+ *
+ * Copyright (C) 86, 89, 91, 1995-2002, 2004 Free Software Foundation, Inc.
+ * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
+ *
+ * Written by Kayvan Aghaiepour and David MacKenzie
+ * Taken from coreutils and turned into a busybox applet by Mike Frysinger
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+#include "libbb.h"
+
+enum { SUM_BSD, PRINT_NAME, SUM_SYSV };
+
+/* BSD: calculate and print the rotated checksum and the size in 1K blocks
+   The checksum varies depending on sizeof (int). */
+/* SYSV: calculate and print the checksum and the size in 512-byte blocks */
+/* Return 1 if successful.  */
+static unsigned sum_file(const char *file, unsigned type)
+{
+#define buf bb_common_bufsiz1
+	unsigned long long total_bytes = 0;
+	int fd, r;
+	/* The sum of all the input bytes, modulo (UINT_MAX + 1).  */
+	unsigned s = 0;
+
+	fd = open_or_warn_stdin(file);
+	if (fd == -1)
+		return 0;
+
+	while (1) {
+		size_t bytes_read = safe_read(fd, buf, BUFSIZ);
+
+		if ((ssize_t)bytes_read <= 0) {
+			r = (fd && close(fd) != 0);
+			if (!bytes_read && !r)
+				/* no error */
+				break;
+			bb_perror_msg(file);
+			return 0;
+		}
+
+		total_bytes += bytes_read;
+		if (type >= SUM_SYSV) {
+			do s += buf[--bytes_read]; while (bytes_read);
+		} else {
+			r = 0;
+			do {
+				s = (s >> 1) + ((s & 1) << 15);
+				s += buf[r++];
+				s &= 0xffff; /* Keep it within bounds. */
+			} while (--bytes_read);
+		}
+	}
+
+	if (type < PRINT_NAME)
+		file = "";
+	if (type >= SUM_SYSV) {
+		r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
+		s = (r & 0xffff) + (r >> 16);
+		printf("%d %llu %s\n", s, (total_bytes + 511) / 512, file);
+	} else
+		printf("%05d %5llu %s\n", s, (total_bytes + 1023) / 1024, file);
+	return 1;
+#undef buf
+}
+
+int sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sum_main(int argc UNUSED_PARAM, char **argv)
+{
+	unsigned n;
+	unsigned type = SUM_BSD;
+
+	n = getopt32(argv, "sr");
+	argv += optind;
+	if (n & 1) type = SUM_SYSV;
+	/* give the bsd priority over sysv func */
+	if (n & 2) type = SUM_BSD;
+
+	if (!argv[0]) {
+		/* Do not print the name */
+		n = sum_file("-", type);
+	} else {
+		/* Need to print the name if either
+		   - more than one file given
+		   - doing sysv */
+		type += (argv[1] || type == SUM_SYSV);
+		n = 1;
+		do {
+			n &= sum_file(*argv, type);
+		} while (*++argv);
+	}
+	return !n;
+}
-- 
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