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183 lines
4.6 KiB
C
183 lines
4.6 KiB
C
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/*
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* sum -- checksum and count the blocks in a file
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* Like BSD sum or SysV sum -r, except like SysV sum if -s option is given.
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*
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* Copyright (C) 86, 89, 91, 1995-2002, 2004 Free Software Foundation, Inc.
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* Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
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* Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
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*
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* Written by Kayvan Aghaiepour and David MacKenzie
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* Taken from coreutils and turned into a busybox applet by Mike Frysinger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <getopt.h>
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#include "libbb.h"
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/* 1 if any of the files read were the standard input */
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static int have_read_stdin;
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/* make a little more readable and avoid using strcmp for just 2 bytes */
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#define IS_STDIN(s) (s[0] == '-' && s[1] == '\0')
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/* Calculate and print the rotated checksum and the size in 1K blocks
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of file FILE, or of the standard input if FILE is "-".
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If PRINT_NAME is >1, print FILE next to the checksum and size.
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The checksum varies depending on sizeof (int).
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Return 1 if successful. */
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static int bsd_sum_file(const char *file, int print_name)
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{
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register FILE *fp;
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register int checksum = 0; /* The checksum mod 2^16. */
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register uintmax_t total_bytes = 0; /* The number of bytes. */
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register int ch; /* Each character read. */
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if (IS_STDIN(file)) {
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fp = stdin;
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have_read_stdin = 1;
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} else {
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fp = fopen(file, "r");
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if (fp == NULL) {
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bb_perror_msg("%s", file);
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return 0;
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}
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}
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while ((ch = getc(fp)) != EOF) {
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++total_bytes;
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checksum = (checksum >> 1) + ((checksum & 1) << 15);
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checksum += ch;
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checksum &= 0xffff; /* Keep it within bounds. */
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}
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if (ferror(fp)) {
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bb_perror_msg("%s", file);
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if (!IS_STDIN(file))
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fclose(fp);
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return 0;
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}
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if (!IS_STDIN(file) && fclose(fp) == EOF) {
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bb_perror_msg("%s", file);
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return 0;
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}
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printf("%05d %5s", checksum,
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make_human_readable_str(total_bytes, 1, 1024));
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if (print_name > 1)
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printf(" %s", file);
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putchar('\n');
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return 1;
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}
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/* Calculate and print the checksum and the size in 512-byte blocks
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of file FILE, or of the standard input if FILE is "-".
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If PRINT_NAME is >0, print FILE next to the checksum and size.
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Return 1 if successful. */
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static int sysv_sum_file(const char *file, int print_name)
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{
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int fd;
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unsigned char buf[8192];
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uintmax_t total_bytes = 0;
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int r;
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int checksum;
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/* The sum of all the input bytes, modulo (UINT_MAX + 1). */
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unsigned int s = 0;
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if (IS_STDIN(file)) {
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fd = 0;
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have_read_stdin = 1;
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} else {
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fd = open(file, O_RDONLY);
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if (fd == -1) {
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bb_perror_msg("%s", file);
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return 0;
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}
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}
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while (1) {
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size_t i;
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size_t bytes_read = safe_read(fd, buf, sizeof(buf));
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if (bytes_read == 0)
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break;
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if (bytes_read == -1) {
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bb_perror_msg("%s", file);
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if (!IS_STDIN(file))
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close(fd);
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return 0;
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}
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for (i = 0; i < bytes_read; i++)
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s += buf[i];
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total_bytes += bytes_read;
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}
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if (!IS_STDIN(file) && close(fd) == -1) {
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bb_perror_msg("%s", file);
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return 0;
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}
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r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
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checksum = (r & 0xffff) + (r >> 16);
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printf("%d %s", checksum,
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make_human_readable_str(total_bytes, 1, 512));
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if (print_name)
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printf(" %s", file);
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putchar('\n');
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return 1;
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}
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int sum_main(int argc, char **argv)
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{
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int flags;
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int ok;
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int files_given;
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int (*sum_func)(const char *, int) = bsd_sum_file;
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/* give the bsd func priority over sysv func */
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flags = bb_getopt_ulflags(argc, argv, "sr");
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if (flags & 1)
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sum_func = sysv_sum_file;
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if (flags & 2)
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sum_func = bsd_sum_file;
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have_read_stdin = 0;
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files_given = argc - optind;
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if (files_given <= 0)
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ok = sum_func("-", files_given);
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else
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for (ok = 1; optind < argc; optind++)
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ok &= sum_func(argv[optind], files_given);
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if (have_read_stdin && fclose(stdin) == EOF)
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bb_perror_msg_and_die("-");
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exit(ok ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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