* 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config SUM
+//config: bool "sum (4.3 kb)"
+//config: default y
+//config: help
+//config: checksum and count the blocks in a file
-#include "busybox.h"
+//applet:IF_SUM(APPLET(sum, BB_DIR_USR_BIN, BB_SUID_DROP))
-enum { sysv_sum, bsd_sum };
+//kbuild:lib-$(CONFIG_SUM) += sum.o
+
+//usage:#define sum_trivial_usage
+//usage: "[-rs] [FILE]..."
+//usage:#define sum_full_usage "\n\n"
+//usage: "Checksum and count the blocks in a file\n"
+//usage: "\n -r Use BSD sum algorithm (1K blocks)"
+//usage: "\n -s Use System V sum algorithm (512byte blocks)"
+
+#include "libbb.h"
+#include "common_bufsiz.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 int sum_file(const char *file, int type, int print_name)
+static unsigned sum_file(const char *file, unsigned type)
{
-#define buf bb_common_bufsiz1
- int r, fd;
- uintmax_t total_bytes = 0;
-
+ unsigned long long total_bytes = 0;
+ int fd, r;
/* The sum of all the input bytes, modulo (UINT_MAX + 1). */
unsigned s = 0;
- fd = 0;
- if (NOT_LONE_DASH(file)) {
- fd = open(file, O_RDONLY);
- if (fd == -1)
- goto ret_bad;
- }
+#define buf bb_common_bufsiz1
+ setup_common_bufsiz();
+
+ fd = open_or_warn_stdin(file);
+ if (fd == -1)
+ return 0;
while (1) {
- size_t bytes_read = safe_read(fd, buf, BUFSIZ);
+ size_t bytes_read = safe_read(fd, buf, COMMON_BUFSIZE);
if ((ssize_t)bytes_read <= 0) {
r = (fd && close(fd) != 0);
if (!bytes_read && !r)
/* no error */
break;
- ret_bad:
- bb_perror_msg(file);
+ bb_simple_perror_msg(file);
return 0;
}
total_bytes += bytes_read;
- if (type == sysv_sum) {
+ if (type >= SUM_SYSV) {
do s += buf[--bytes_read]; while (bytes_read);
} else {
r = 0;
}
}
- if (!print_name) file = "";
- if (type == sysv_sum) {
+ 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);
+ printf("%u %llu %s\n", s, (total_bytes + 511) / 512, file);
} else
- printf("%05d %5ju %s\n", s, (total_bytes+1023)/1024, file);
+ printf("%05u %5llu %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) MAIN_EXTERNALLY_VISIBLE;
+int sum_main(int argc UNUSED_PARAM, char **argv)
{
- int n;
- int type = bsd_sum;
+ unsigned n;
+ unsigned type = SUM_BSD;
- n = getopt32(argc, argv, "sr");
- if (n & 1) type = sysv_sum;
+ n = getopt32(argv, "sr");
+ argv += optind;
+ if (n & 1) type = SUM_SYSV;
/* give the bsd priority over sysv func */
- if (n & 2) type = bsd_sum;
-
- if (argc == optind)
- n = sum_file("-", type, 0);
- else
- for (n = 1; optind < argc; optind++)
- n &= sum_file(argv[optind], type, 1);
+ 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;
}