+/* vi: set sw=4 ts=4: */
/*
* sum -- checksum and count the blocks in a file
* Like BSD sum or SysV sum -r, except like SysV sum if -s option is given.
* Written by Kayvan Aghaiepour and David MacKenzie
* Taken from coreutils and turned into a busybox applet by Mike Frysinger
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <getopt.h>
-
-#include "libbb.h"
-
-/* 1 if any of the files read were the standard input */
-static int have_read_stdin;
-
-/* make a little more readable and avoid using strcmp for just 2 bytes */
-#define IS_STDIN(s) (s[0] == '-' && s[1] == '\0')
-
-/* Calculate and print the rotated checksum and the size in 1K blocks
- of file FILE, or of the standard input if FILE is "-".
- If PRINT_NAME is >1, print FILE next to the checksum and size.
- The checksum varies depending on sizeof (int).
- Return 1 if successful. */
-static int bsd_sum_file(const char *file, int print_name)
-{
- register FILE *fp;
- register int checksum = 0; /* The checksum mod 2^16. */
- register uintmax_t total_bytes = 0; /* The number of bytes. */
- register int ch; /* Each character read. */
-
- if (IS_STDIN(file)) {
- fp = stdin;
- have_read_stdin = 1;
- } else {
- fp = fopen(file, "r");
- if (fp == NULL) {
- bb_perror_msg("%s", file);
- return 0;
- }
- }
-
- while ((ch = getc(fp)) != EOF) {
- ++total_bytes;
- checksum = (checksum >> 1) + ((checksum & 1) << 15);
- checksum += ch;
- checksum &= 0xffff; /* Keep it within bounds. */
- }
-
- if (ferror(fp)) {
- bb_perror_msg("%s", file);
- if (!IS_STDIN(file))
- fclose(fp);
- return 0;
- }
-
- if (!IS_STDIN(file) && fclose(fp) == EOF) {
- bb_perror_msg("%s", file);
- return 0;
- }
+#include "busybox.h"
- printf("%05d %5s", checksum,
- make_human_readable_str(total_bytes, 1, 1024));
- if (print_name > 1)
- printf(" %s", file);
- putchar('\n');
+enum { SUM_BSD, PRINT_NAME, SUM_SYSV };
- return 1;
-}
-
-/* Calculate and print the checksum and the size in 512-byte blocks
- of file FILE, or of the standard input if FILE is "-".
- If PRINT_NAME is >0, print FILE next to the checksum and size.
- Return 1 if successful. */
-static int sysv_sum_file(const char *file, int print_name)
+/* BSD: calculate and print the rotated checksum and the size in 1K blocks
+ The checksum varies depending on sizeof (int). */
+/* SYSV: calculate and print the checksum and the size in 512-byte blocks */
+/* Return 1 if successful. */
+static unsigned sum_file(const char *file, const unsigned type)
{
- int fd;
- unsigned char buf[8192];
+#define buf bb_common_bufsiz1
uintmax_t total_bytes = 0;
- int r;
- int checksum;
+ int fd = 0, r;
/* The sum of all the input bytes, modulo (UINT_MAX + 1). */
- unsigned int s = 0;
+ unsigned s = 0;
- if (IS_STDIN(file)) {
- fd = 0;
- have_read_stdin = 1;
- } else {
+ if (NOT_LONE_DASH(file)) {
fd = open(file, O_RDONLY);
- if (fd == -1) {
- bb_perror_msg("%s", file);
- return 0;
- }
+ if (fd == -1)
+ goto ret_bad;
}
while (1) {
- size_t i;
- size_t bytes_read = safe_read(fd, buf, sizeof(buf));
-
- if (bytes_read == 0)
- break;
-
- if (bytes_read == -1) {
- bb_perror_msg("%s", file);
- if (!IS_STDIN(file))
- close(fd);
+ size_t bytes_read = safe_read(fd, buf, BUFSIZ);
+
+ if ((ssize_t)bytes_read <= 0) {
+ r = (fd && close(fd) != 0);
+ if (!bytes_read && !r)
+ /* no error */
+ break;
+ ret_bad:
+ bb_perror_msg(file);
return 0;
}
- for (i = 0; i < bytes_read; i++)
- s += buf[i];
total_bytes += bytes_read;
+ if (type >= SUM_SYSV) {
+ do s += buf[--bytes_read]; while (bytes_read);
+ } else {
+ r = 0;
+ do {
+ s = (s >> 1) + ((s & 1) << 15);
+ s += buf[r++];
+ s &= 0xffff; /* Keep it within bounds. */
+ } while (--bytes_read);
+ }
}
- if (!IS_STDIN(file) && close(fd) == -1) {
- bb_perror_msg("%s", file);
- return 0;
- }
-
- r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
- checksum = (r & 0xffff) + (r >> 16);
-
- printf("%d %s", checksum,
- make_human_readable_str(total_bytes, 1, 512));
- if (print_name)
- printf(" %s", file);
- putchar('\n');
-
+ if (type < PRINT_NAME)
+ file = "";
+ if (type >= SUM_SYSV) {
+ r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
+ s = (r & 0xffff) + (r >> 16);
+ printf("%d %ju %s\n", s, (total_bytes+511)/512, file);
+ } else
+ printf("%05d %5ju %s\n", s, (total_bytes+1023)/1024, file);
return 1;
+#undef buf
}
+int sum_main(int argc, char **argv);
int sum_main(int argc, char **argv)
{
- int flags;
- int ok;
- int files_given;
- int (*sum_func)(const char *, int) = bsd_sum_file;
+ unsigned n;
+ unsigned type = SUM_BSD;
- /* give the bsd func priority over sysv func */
- flags = bb_getopt_ulflags(argc, argv, "sr");
- if (flags & 1)
- sum_func = sysv_sum_file;
- if (flags & 2)
- sum_func = bsd_sum_file;
+ n = getopt32(argc, argv, "sr");
+ if (n & 1) type = SUM_SYSV;
+ /* give the bsd priority over sysv func */
+ if (n & 2) type = SUM_BSD;
- have_read_stdin = 0;
- files_given = argc - optind;
- if (files_given <= 0)
- ok = sum_func("-", files_given);
- else
- for (ok = 1; optind < argc; optind++)
- ok &= sum_func(argv[optind], files_given);
-
- if (have_read_stdin && fclose(stdin) == EOF)
- bb_perror_msg_and_die("-");
-
- exit(ok ? EXIT_SUCCESS : EXIT_FAILURE);
+ if (argc == optind) {
+ /* Do not print the name */
+ n = sum_file("-", type);
+ } else {
+ /* Need to print the name if either
+ - more than one file given
+ - doing sysv */
+ type += argc - 1 > optind || type == SUM_SYSV;
+ for (n = 1; optind < argc; optind++)
+ n &= sum_file(argv[optind], type);
+ }
+ return !n;
}
projects / oweals / busybox.git / blobdiff