mirror of
https://git.busybox.net/busybox.git
synced 2024-11-23 05:33:33 +08:00
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/* 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 GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
//config:config SUM
|
|
//config: bool "sum (4.2 kb)"
|
|
//config: default y
|
|
//config: help
|
|
//config: checksum and count the blocks in a file
|
|
|
|
//applet:IF_SUM(APPLET(sum, BB_DIR_USR_BIN, BB_SUID_DROP))
|
|
|
|
//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 unsigned sum_file(const char *file, unsigned type)
|
|
{
|
|
unsigned long long total_bytes = 0;
|
|
int fd, r;
|
|
/* The sum of all the input bytes, modulo (UINT_MAX + 1). */
|
|
unsigned s = 0;
|
|
|
|
#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, COMMON_BUFSIZE);
|
|
|
|
if ((ssize_t)bytes_read <= 0) {
|
|
r = (fd && close(fd) != 0);
|
|
if (!bytes_read && !r)
|
|
/* no error */
|
|
break;
|
|
bb_simple_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("%u %llu %s\n", s, (total_bytes + 511) / 512, file);
|
|
} else
|
|
printf("%05u %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;
|
|
}
|