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New applet cksum, from Rob Sullivan.

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This commit is contained in:
Rob Landley 2006-04-18 20:57:28 +00:00
parent bbd50b58ea
commit 856489b63c
5 changed files with 69 additions and 0 deletions
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6
coreutils/Config.in
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@ -52,6 +52,12 @@ config CONFIG_CHROOT
chroot is used to change the root directory and run a command.
The default command is `/bin/sh'.
config CONFIG_CKSUM
bool "cksum"
default n
help
cksum is used to calculate the CRC32 checksum of a file.
config CONFIG_CMP
bool "cmp"
default n

1
coreutils/Makefile.in
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@ -18,6 +18,7 @@ COREUTILS-$(CONFIG_CHGRP) += chgrp.o
COREUTILS-$(CONFIG_CHMOD) += chmod.o
COREUTILS-$(CONFIG_CHOWN) += chown.o
COREUTILS-$(CONFIG_CHROOT) += chroot.o
COREUTILS-$(CONFIG_CKSUM) += cksum.o
COREUTILS-$(CONFIG_CMP) += cmp.o
COREUTILS-$(CONFIG_COMM) += comm.o
COREUTILS-$(CONFIG_CP) += cp.o

56
coreutils/cksum.c Normal file
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@ -0,0 +1,56 @@
/* vi: set sw=4 ts=4: */
/*
* cksum - calculate the CRC32 checksum of a file
*
* Copyright (C) 2006 by Rob Sullivan, with ideas from code by Walter Harms
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <inttypes.h>
#include "busybox.h"
int cksum_main(int argc, char **argv) {
uint32_t *crc32_table = bb_crc32_filltable(1);
FILE *fp;
uint32_t crc;
long length, filesize;
int bytes_read;
char *cp;
RESERVE_CONFIG_BUFFER(buf, BUFSIZ);
int inp_stdin = (argc == optind) ? 1 : 0;
do {
fp = bb_wfopen_input((inp_stdin) ? bb_msg_standard_input : *++argv);
crc = 0;
length = 0;
while ((bytes_read = fread(buf, 1, BUFSIZ, fp)) > 0) {
cp = buf;
length += bytes_read;
while (bytes_read--)
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ (*cp++)) & 0xffL];
}
filesize = length;
for (; length; length >>= 8)
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ length) & 0xffL];
crc ^= 0xffffffffL;
if (inp_stdin) {
printf("%"PRIu32" %li\n", crc, filesize);
break;
}
printf("%"PRIu32" %li %s\n", crc, filesize, *argv);
fclose(fp);
} while (*(argv+1));
return EXIT_SUCCESS;
}

1
include/applets.h
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@ -70,6 +70,7 @@ USE_CHMOD(APPLET(chmod, chmod_main, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_CHOWN(APPLET(chown, chown_main, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_CHROOT(APPLET(chroot, chroot_main, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
USE_CHVT(APPLET(chvt, chvt_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_CKSUM(APPLET(cksum, cksum_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_CLEAR(APPLET(clear, clear_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_CMP(APPLET(cmp, cmp_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_COMM(APPLET(comm, comm_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))

5
include/usage.h
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@ -224,6 +224,11 @@
#define chvt_full_usage \
"Changes the foreground virtual terminal to /dev/ttyN"
#define cksum_trivial_usage \
"FILES..."
#define cksum_full_usage \
"Calculates the CRC32 checksums of FILES."
#define clear_trivial_usage \
""
#define clear_full_usage \