Annotation of /trunk/mkinitrd-magellan/busybox/coreutils/sum.c
Parent Directory | Revision Log
Revision 984 -
(hide annotations)
(download)
Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
File MIME type: text/plain
File size: 2558 byte(s)
Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
File MIME type: text/plain
File size: 2558 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * sum -- checksum and count the blocks in a file | ||
4 | * Like BSD sum or SysV sum -r, except like SysV sum if -s option is given. | ||
5 | * | ||
6 | * Copyright (C) 86, 89, 91, 1995-2002, 2004 Free Software Foundation, Inc. | ||
7 | * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org> | ||
8 | * Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org> | ||
9 | * | ||
10 | * Written by Kayvan Aghaiepour and David MacKenzie | ||
11 | * Taken from coreutils and turned into a busybox applet by Mike Frysinger | ||
12 | * | ||
13 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. | ||
14 | */ | ||
15 | |||
16 | niro | 816 | #include "libbb.h" |
17 | niro | 532 | |
18 | niro | 816 | enum { SUM_BSD, PRINT_NAME, SUM_SYSV }; |
19 | niro | 532 | |
20 | /* BSD: calculate and print the rotated checksum and the size in 1K blocks | ||
21 | The checksum varies depending on sizeof (int). */ | ||
22 | /* SYSV: calculate and print the checksum and the size in 512-byte blocks */ | ||
23 | /* Return 1 if successful. */ | ||
24 | niro | 816 | static unsigned sum_file(const char *file, unsigned type) |
25 | niro | 532 | { |
26 | #define buf bb_common_bufsiz1 | ||
27 | niro | 816 | unsigned long long total_bytes = 0; |
28 | int fd, r; | ||
29 | niro | 532 | /* The sum of all the input bytes, modulo (UINT_MAX + 1). */ |
30 | unsigned s = 0; | ||
31 | |||
32 | niro | 816 | fd = open_or_warn_stdin(file); |
33 | if (fd == -1) | ||
34 | return 0; | ||
35 | niro | 532 | |
36 | while (1) { | ||
37 | size_t bytes_read = safe_read(fd, buf, BUFSIZ); | ||
38 | |||
39 | if ((ssize_t)bytes_read <= 0) { | ||
40 | r = (fd && close(fd) != 0); | ||
41 | if (!bytes_read && !r) | ||
42 | /* no error */ | ||
43 | break; | ||
44 | niro | 984 | bb_simple_perror_msg(file); |
45 | niro | 532 | return 0; |
46 | } | ||
47 | |||
48 | total_bytes += bytes_read; | ||
49 | niro | 816 | if (type >= SUM_SYSV) { |
50 | niro | 532 | do s += buf[--bytes_read]; while (bytes_read); |
51 | } else { | ||
52 | r = 0; | ||
53 | do { | ||
54 | s = (s >> 1) + ((s & 1) << 15); | ||
55 | s += buf[r++]; | ||
56 | s &= 0xffff; /* Keep it within bounds. */ | ||
57 | } while (--bytes_read); | ||
58 | } | ||
59 | } | ||
60 | |||
61 | niro | 816 | if (type < PRINT_NAME) |
62 | file = ""; | ||
63 | if (type >= SUM_SYSV) { | ||
64 | niro | 532 | r = (s & 0xffff) + ((s & 0xffffffff) >> 16); |
65 | s = (r & 0xffff) + (r >> 16); | ||
66 | niro | 816 | printf("%d %llu %s\n", s, (total_bytes + 511) / 512, file); |
67 | niro | 532 | } else |
68 | niro | 816 | printf("%05d %5llu %s\n", s, (total_bytes + 1023) / 1024, file); |
69 | niro | 532 | return 1; |
70 | #undef buf | ||
71 | } | ||
72 | |||
73 | niro | 816 | int sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
74 | int sum_main(int argc UNUSED_PARAM, char **argv) | ||
75 | niro | 532 | { |
76 | niro | 816 | unsigned n; |
77 | unsigned type = SUM_BSD; | ||
78 | niro | 532 | |
79 | niro | 816 | n = getopt32(argv, "sr"); |
80 | argv += optind; | ||
81 | if (n & 1) type = SUM_SYSV; | ||
82 | niro | 532 | /* give the bsd priority over sysv func */ |
83 | niro | 816 | if (n & 2) type = SUM_BSD; |
84 | niro | 532 | |
85 | niro | 816 | if (!argv[0]) { |
86 | /* Do not print the name */ | ||
87 | n = sum_file("-", type); | ||
88 | } else { | ||
89 | /* Need to print the name if either | ||
90 | - more than one file given | ||
91 | - doing sysv */ | ||
92 | type += (argv[1] || type == SUM_SYSV); | ||
93 | n = 1; | ||
94 | do { | ||
95 | n &= sum_file(*argv, type); | ||
96 | } while (*++argv); | ||
97 | } | ||
98 | niro | 532 | return !n; |
99 | } |