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162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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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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* Licensed under the GPL v2, see the file LICENSE in this tarball.
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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 "busybox.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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FILE *fp;
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int checksum = 0; /* The checksum mod 2^16. */
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uintmax_t total_bytes = 0; /* The number of bytes. */
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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 = bb_wfopen(file, "r");
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if (fp == NULL)
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return 0;
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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(file);
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bb_fclose_nonstdin(fp);
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return 0;
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}
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if (bb_fclose_nonstdin(fp) == EOF) {
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bb_perror_msg(file);
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return 0;
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}
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printf("%05d %5ju ", checksum, (total_bytes+1023)/1024);
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if (print_name > 1)
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puts(file);
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else
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printf("\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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#define MY_BUF_SIZE 8192
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static int sysv_sum_file(const char *file, int print_name)
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{
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RESERVE_CONFIG_UBUFFER(buf, MY_BUF_SIZE);
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int fd;
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uintmax_t total_bytes = 0;
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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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goto release_and_ret;
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}
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while (1) {
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size_t bytes_read = safe_read(fd, buf, MY_BUF_SIZE);
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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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release_and_ret:
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bb_perror_msg(file);
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RELEASE_CONFIG_BUFFER(buf);
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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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total_bytes += bytes_read;
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while (bytes_read--)
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s += buf[bytes_read];
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}
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if (!IS_STDIN(file) && close(fd) == -1)
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goto release_and_ret;
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else
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RELEASE_CONFIG_BUFFER(buf);
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{
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int r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
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s = (r & 0xffff) + (r >> 16);
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printf("%d %ju ", s, (total_bytes+511)/512);
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}
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puts(print_name ? file : "");
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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 (*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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if ((argc - optind) == 0)
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ok = sum_func("-", 0);
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else
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for (ok = 1; optind < argc; optind++)
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ok &= sum_func(argv[optind], 1);
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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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