| /* 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" |
| //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; |
| } |