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Diffstat (limited to 'i/pc104/initrd/conf/busybox/coreutils/sum.c')
-rw-r--r--i/pc104/initrd/conf/busybox/coreutils/sum.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/coreutils/sum.c b/i/pc104/initrd/conf/busybox/coreutils/sum.c
new file mode 100644
index 0000000..9327ca5
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/coreutils/sum.c
@@ -0,0 +1,100 @@
+/* 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 "busybox.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, const unsigned type)
+{
+#define buf bb_common_bufsiz1
+ uintmax_t total_bytes = 0;
+ int fd = 0, r;
+
+ /* The sum of all the input bytes, modulo (UINT_MAX + 1). */
+ unsigned s = 0;
+
+ if (NOT_LONE_DASH(file)) {
+ fd = open(file, O_RDONLY);
+ if (fd == -1)
+ goto ret_bad;
+ }
+
+ 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;
+ ret_bad:
+ 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 %ju %s\n", s, (total_bytes+511)/512, file);
+ } else
+ printf("%05d %5ju %s\n", s, (total_bytes+1023)/1024, file);
+ return 1;
+#undef buf
+}
+
+int sum_main(int argc, char **argv);
+int sum_main(int argc, char **argv)
+{
+ unsigned n;
+ unsigned type = SUM_BSD;
+
+ n = getopt32(argc, argv, "sr");
+ if (n & 1) type = SUM_SYSV;
+ /* give the bsd priority over sysv func */
+ if (n & 2) type = SUM_BSD;
+
+ if (argc == optind) {
+ /* 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 += argc - 1 > optind || type == SUM_SYSV;
+ for (n = 1; optind < argc; optind++)
+ n &= sum_file(argv[optind], type);
+ }
+ return !n;
+}