* Written by Kayvan Aghaiepour and David MacKenzie
* Taken from coreutils and turned into a busybox applet by Mike Frysinger
*
- * Licensed under the GPL v2, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config SUM
+//config: bool "sum"
+//config: default y
+//config: help
+//config: checksum and count the blocks in a file
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
+//applet:IF_SUM(APPLET(sum, BB_DIR_USR_BIN, BB_SUID_DROP))
-#include "busybox.h"
+//kbuild:lib-$(CONFIG_SUM) += sum.o
-/* 1 if any of the files read were the standard input */
-static int have_read_stdin;
+//usage:#define sum_trivial_usage
+//usage: "[-rs] [FILE]..."
+//usage:#define sum_full_usage "\n\n"
+//usage: "Checksum and count the blocks in a file\n"
+//usage: "\n -r Use BSD sum algorithm (1K blocks)"
+//usage: "\n -s Use System V sum algorithm (512byte blocks)"
-/* make a little more readable and avoid using strcmp for just 2 bytes */
-#define IS_STDIN(s) (s[0] == '-' && s[1] == '\0')
+#include "libbb.h"
+#include "common_bufsiz.h"
-/* 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)
-{
- FILE *fp;
- int checksum = 0; /* The checksum mod 2^16. */
- uintmax_t total_bytes = 0; /* The number of bytes. */
- int ch; /* Each character read. */
-
- if (IS_STDIN(file)) {
- fp = stdin;
- have_read_stdin = 1;
- } else {
- fp = bb_wfopen(file, "r");
- if (fp == NULL)
- 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(file);
- bb_fclose_nonstdin(fp);
- return 0;
- }
-
- if (bb_fclose_nonstdin(fp) == EOF) {
- bb_perror_msg(file);
- return 0;
- }
-
- printf("%05d %5ju ", checksum, (total_bytes+1023)/1024);
- if (print_name > 1)
- puts(file);
- else
- printf("\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. */
-#define MY_BUF_SIZE 8192
-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, unsigned type)
{
- RESERVE_CONFIG_UBUFFER(buf, MY_BUF_SIZE);
- int fd;
- uintmax_t total_bytes = 0;
-
+ unsigned long long total_bytes = 0;
+ int fd, 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 {
- fd = open(file, O_RDONLY);
- if (fd == -1)
- goto release_and_ret;
- }
+#define buf bb_common_bufsiz1
+ setup_common_bufsiz();
- while (1) {
- size_t bytes_read = safe_read(fd, buf, MY_BUF_SIZE);
-
- if (bytes_read == 0)
- break;
+ fd = open_or_warn_stdin(file);
+ if (fd == -1)
+ return 0;
- if (bytes_read == -1) {
-release_and_ret:
- bb_perror_msg(file);
- RELEASE_CONFIG_BUFFER(buf);
- if (!IS_STDIN(file))
- close(fd);
+ while (1) {
+ size_t bytes_read = safe_read(fd, buf, COMMON_BUFSIZE);
+
+ if ((ssize_t)bytes_read <= 0) {
+ r = (fd && close(fd) != 0);
+ if (!bytes_read && !r)
+ /* no error */
+ break;
+ bb_simple_perror_msg(file);
return 0;
}
total_bytes += bytes_read;
- while (bytes_read--)
- s += buf[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)
- goto release_and_ret;
- else
- RELEASE_CONFIG_BUFFER(buf);
-
- {
- int r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
+ if (type < PRINT_NAME)
+ file = "";
+ if (type >= SUM_SYSV) {
+ r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
s = (r & 0xffff) + (r >> 16);
-
- printf("%d %ju ", s, (total_bytes+511)/512);
- }
- puts(print_name ? file : "");
-
+ printf("%u %llu %s\n", s, (total_bytes + 511) / 512, file);
+ } else
+ printf("%05u %5llu %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) MAIN_EXTERNALLY_VISIBLE;
+int sum_main(int argc UNUSED_PARAM, char **argv)
{
- int flags;
- int ok;
- int (*sum_func)(const char *, int) = bsd_sum_file;
-
- /* 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;
-
- have_read_stdin = 0;
- if ((argc - optind) == 0)
- ok = sum_func("-", 0);
- else
- for (ok = 1; optind < argc; optind++)
- ok &= sum_func(argv[optind], 1);
-
- if (have_read_stdin && fclose(stdin) == EOF)
- bb_perror_msg_and_die("-");
-
- exit(ok ? EXIT_SUCCESS : EXIT_FAILURE);
+ unsigned n;
+ unsigned type = SUM_BSD;
+
+ n = getopt32(argv, "sr");
+ argv += optind;
+ if (n & 1) type = SUM_SYSV;
+ /* give the bsd priority over sysv func */
+ if (n & 2) type = SUM_BSD;
+
+ if (!argv[0]) {
+ /* 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 += (argv[1] || type == SUM_SYSV);
+ n = 1;
+ do {
+ n &= sum_file(*argv, type);
+ } while (*++argv);
+ }
+ return !n;
}
projects / oweals / busybox.git / blobdiff