source: MondoRescue/branches/stable/mindi-busybox/coreutils/sum.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.8 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 the GPL v2, see the file LICENSE in this tarball.
14 */
15
16#include <stdio.h>
17#include <sys/types.h>
18#include <sys/stat.h>
19#include <fcntl.h>
20#include <unistd.h>
21
22#include "busybox.h"
23
24/* 1 if any of the files read were the standard input */
25static int have_read_stdin;
26
27/* make a little more readable and avoid using strcmp for just 2 bytes */
28#define IS_STDIN(s) (s[0] == '-' && s[1] == '\0')
29
30/* Calculate and print the rotated checksum and the size in 1K blocks
31   of file FILE, or of the standard input if FILE is "-".
32   If PRINT_NAME is >1, print FILE next to the checksum and size.
33   The checksum varies depending on sizeof (int).
34   Return 1 if successful.  */
35static int bsd_sum_file(const char *file, int print_name)
36{
37    FILE *fp;
38    int checksum = 0;          /* The checksum mod 2^16. */
39    uintmax_t total_bytes = 0; /* The number of bytes. */
40    int ch;                    /* Each character read. */
41
42    if (IS_STDIN(file)) {
43        fp = stdin;
44        have_read_stdin = 1;
45    } else {
46        fp = bb_wfopen(file, "r");
47        if (fp == NULL)
48            return 0;
49    }
50
51    while ((ch = getc(fp)) != EOF) {
52        ++total_bytes;
53        checksum = (checksum >> 1) + ((checksum & 1) << 15);
54        checksum += ch;
55        checksum &= 0xffff;             /* Keep it within bounds. */
56    }
57
58    if (ferror(fp)) {
59        bb_perror_msg(file);
60        bb_fclose_nonstdin(fp);
61        return 0;
62    }
63
64    if (bb_fclose_nonstdin(fp) == EOF) {
65        bb_perror_msg(file);
66        return 0;
67    }
68
69    printf("%05d %5ju ", checksum, (total_bytes+1023)/1024);
70    if (print_name > 1)
71        puts(file);
72    else
73        printf("\n");
74
75    return 1;
76}
77
78/* Calculate and print the checksum and the size in 512-byte blocks
79   of file FILE, or of the standard input if FILE is "-".
80   If PRINT_NAME is >0, print FILE next to the checksum and size.
81   Return 1 if successful.  */
82#define MY_BUF_SIZE 8192
83static int sysv_sum_file(const char *file, int print_name)
84{
85    RESERVE_CONFIG_BUFFER(buf, MY_BUF_SIZE);
86    int fd;
87    uintmax_t total_bytes = 0;
88
89    /* The sum of all the input bytes, modulo (UINT_MAX + 1).  */
90    unsigned int s = 0;
91
92    if (IS_STDIN(file)) {
93        fd = 0;
94        have_read_stdin = 1;
95    } else {
96        fd = open(file, O_RDONLY);
97        if (fd == -1)
98            goto release_and_ret;
99    }
100
101    while (1) {
102        size_t bytes_read = safe_read(fd, buf, MY_BUF_SIZE);
103
104        if (bytes_read == 0)
105            break;
106
107        if (bytes_read == -1) {
108release_and_ret:
109            bb_perror_msg(file);
110            RELEASE_CONFIG_BUFFER(buf);
111            if (!IS_STDIN(file))
112                close(fd);
113            return 0;
114        }
115
116        total_bytes += bytes_read;
117        while (bytes_read--)
118            s += buf[bytes_read];
119    }
120
121    if (!IS_STDIN(file) && close(fd) == -1)
122        goto release_and_ret;
123    else
124        RELEASE_CONFIG_BUFFER(buf);
125
126    {
127        int r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
128        s = (r & 0xffff) + (r >> 16);
129
130        printf("%d %ju ", s, (total_bytes+511)/512);
131    }
132    puts(print_name ? file : "");
133
134    return 1;
135}
136
137int sum_main(int argc, char **argv)
138{
139    int flags;
140    int ok;
141    int (*sum_func)(const char *, int) = bsd_sum_file;
142
143    /* give the bsd func priority over sysv func */
144    flags = bb_getopt_ulflags(argc, argv, "sr");
145    if (flags & 1)
146        sum_func = sysv_sum_file;
147    if (flags & 2)
148        sum_func = bsd_sum_file;
149
150    have_read_stdin = 0;
151    if ((argc - optind) == 0)
152        ok = sum_func("-", 0);
153    else
154        for (ok = 1; optind < argc; optind++)
155            ok &= sum_func(argv[optind], 1);
156
157    if (have_read_stdin && fclose(stdin) == EOF)
158        bb_perror_msg_and_die("-");
159
160    exit(ok ? EXIT_SUCCESS : EXIT_FAILURE);
161}
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