Contents of /trunk/mkinitrd-magellan/busybox/coreutils/sum.c
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 2330 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* 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 | #include "busybox.h" |
17 | |
18 | enum { sysv_sum, bsd_sum }; |
19 | |
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 | static int sum_file(const char *file, int type, int print_name) |
25 | { |
26 | #define buf bb_common_bufsiz1 |
27 | int r, fd; |
28 | uintmax_t total_bytes = 0; |
29 | |
30 | /* The sum of all the input bytes, modulo (UINT_MAX + 1). */ |
31 | unsigned s = 0; |
32 | |
33 | fd = 0; |
34 | if (NOT_LONE_DASH(file)) { |
35 | fd = open(file, O_RDONLY); |
36 | if (fd == -1) |
37 | goto ret_bad; |
38 | } |
39 | |
40 | while (1) { |
41 | size_t bytes_read = safe_read(fd, buf, BUFSIZ); |
42 | |
43 | if ((ssize_t)bytes_read <= 0) { |
44 | r = (fd && close(fd) != 0); |
45 | if (!bytes_read && !r) |
46 | /* no error */ |
47 | break; |
48 | ret_bad: |
49 | bb_perror_msg(file); |
50 | return 0; |
51 | } |
52 | |
53 | total_bytes += bytes_read; |
54 | if (type == sysv_sum) { |
55 | do s += buf[--bytes_read]; while (bytes_read); |
56 | } else { |
57 | r = 0; |
58 | do { |
59 | s = (s >> 1) + ((s & 1) << 15); |
60 | s += buf[r++]; |
61 | s &= 0xffff; /* Keep it within bounds. */ |
62 | } while (--bytes_read); |
63 | } |
64 | } |
65 | |
66 | if (!print_name) file = ""; |
67 | if (type == sysv_sum) { |
68 | r = (s & 0xffff) + ((s & 0xffffffff) >> 16); |
69 | s = (r & 0xffff) + (r >> 16); |
70 | printf("%d %ju %s\n", s, (total_bytes+511)/512, file); |
71 | } else |
72 | printf("%05d %5ju %s\n", s, (total_bytes+1023)/1024, file); |
73 | return 1; |
74 | #undef buf |
75 | } |
76 | |
77 | int sum_main(int argc, char **argv) |
78 | { |
79 | int n; |
80 | int type = bsd_sum; |
81 | |
82 | n = getopt32(argc, argv, "sr"); |
83 | if (n & 1) type = sysv_sum; |
84 | /* give the bsd priority over sysv func */ |
85 | if (n & 2) type = bsd_sum; |
86 | |
87 | if (argc == optind) |
88 | n = sum_file("-", type, 0); |
89 | else |
90 | for (n = 1; optind < argc; optind++) |
91 | n &= sum_file(argv[optind], type, 1); |
92 | |
93 | return !n; |
94 | } |