source: branches/2.2.9/mindi-busybox/coreutils/sum.c @ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 2.5 KB
Line 
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 GPLv2 or later, see file LICENSE in this source tree.
14 */
15
16#include "libbb.h"
17
18enum { SUM_BSD, PRINT_NAME, SUM_SYSV };
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.  */
24static unsigned sum_file(const char *file, unsigned type)
25{
26#define buf bb_common_bufsiz1
27    unsigned long long total_bytes = 0;
28    int fd, r;
29    /* The sum of all the input bytes, modulo (UINT_MAX + 1).  */
30    unsigned s = 0;
31
32    fd = open_or_warn_stdin(file);
33    if (fd == -1)
34        return 0;
35
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            bb_simple_perror_msg(file);
45            return 0;
46        }
47
48        total_bytes += bytes_read;
49        if (type >= SUM_SYSV) {
50            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    if (type < PRINT_NAME)
62        file = "";
63    if (type >= SUM_SYSV) {
64        r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
65        s = (r & 0xffff) + (r >> 16);
66        printf("%d %llu %s\n", s, (total_bytes + 511) / 512, file);
67    } else
68        printf("%05d %5llu %s\n", s, (total_bytes + 1023) / 1024, file);
69    return 1;
70#undef buf
71}
72
73int sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
74int sum_main(int argc UNUSED_PARAM, char **argv)
75{
76    unsigned n;
77    unsigned type = SUM_BSD;
78
79    n = getopt32(argv, "sr");
80    argv += optind;
81    if (n & 1) type = SUM_SYSV;
82    /* give the bsd priority over sysv func */
83    if (n & 2) type = SUM_BSD;
84
85    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    return !n;
99}
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