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- /* sum -- checksum and count the blocks in a file
- Copyright (C) 1986, 1989, 1991 Free Software Foundation, Inc.
-
- 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Like BSD sum or SysV sum -r, except like SysV sum if -s option is given. */
-
- /* Written by Kayvan Aghaiepour and David MacKenzie. */
-
- #include <config.h>
-
- #include <stdio.h>
- #include <sys/types.h>
- #include <getopt.h>
- #include "system.h"
- #include "version.h"
-
- static int bsd_sum_file ();
- static int sysv_sum_file ();
-
- void error ();
- int safe_read ();
-
- /* The name this program was run with. */
- char *program_name;
-
- /* Nonzero if any of the files read were the standard input. */
- static int have_read_stdin;
-
- /* Right-rotate 32-bit integer variable C. */
- #define ROTATE_RIGHT(c) if ((c) & 01) (c) = ((c) >>1) + 0x8000; else (c) >>= 1;
-
- /* If non-zero, display usage information and exit. */
- static int show_help;
-
- /* If non-zero, print the version on standard output then exit. */
- static int show_version;
-
- static struct option const longopts[] =
- {
- {"sysv", no_argument, NULL, 's'},
- {"help", no_argument, &show_help, 1},
- {"version", no_argument, &show_version, 1},
- {NULL, 0, NULL, 0}
- };
-
- static void
- usage (status)
- int status;
- {
- if (status != 0)
- fprintf (stderr, "Try `%s --help' for more information.\n",
- program_name);
- else
- {
- printf ("\
- Usage: %s [OPTION]... [FILE]...\n\
- ",
- program_name);
- printf ("\
- \n\
- -r defeat -s, use BSD sum algorithm, use 1K blocks\n\
- -s, --sysv use System V sum algorithm, use 512 bytes blocks\n\
- --help display this help and exit\n\
- --version output version information and exit\n\
- \n\
- With no FILE, or when FILE is -, read standard input.\n\
- ");
- }
- exit (status);
- }
-
- main (argc, argv)
- int argc;
- char **argv;
- {
- int errors = 0;
- int optc;
- int files_given;
- int (*sum_func) () = bsd_sum_file;
-
- program_name = argv[0];
- have_read_stdin = 0;
-
- while ((optc = getopt_long (argc, argv, "rs", longopts, (int *) 0)) != -1)
- {
- switch (optc)
- {
- case 0:
- break;
-
- case 'r': /* For SysV compatibility. */
- sum_func = bsd_sum_file;
- break;
-
- case 's':
- sum_func = sysv_sum_file;
- break;
-
- default:
- usage (1);
- }
- }
-
- if (show_version)
- {
- printf ("sum - %s\n", version_string);
- exit (0);
- }
-
- if (show_help)
- usage (0);
-
- files_given = argc - optind;
- if (files_given == 0)
- {
- if ((*sum_func) ("-", files_given) < 0)
- errors = 1;
- }
- else
- for (; optind < argc; optind++)
- if ((*sum_func) (argv[optind], files_given) < 0)
- errors = 1;
-
- if (have_read_stdin && fclose (stdin) == EOF)
- error (1, errno, "-");
- exit (errors);
- }
-
- /* 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 0 if successful, -1 if an error occurs. */
-
- static int
- bsd_sum_file (file, print_name)
- char *file;
- int print_name;
- {
- register FILE *fp;
- register unsigned long checksum = 0; /* The checksum mod 2^16. */
- register long total_bytes = 0; /* The number of bytes. */
- register int ch; /* Each character read. */
-
- if (!strcmp (file, "-"))
- {
- fp = stdin;
- have_read_stdin = 1;
- }
- else
- {
- fp = fopen (file, "r");
- if (fp == NULL)
- {
- error (0, errno, "%s", file);
- return -1;
- }
- }
-
- /* This algorithm seems to depend on sign extension in `ch' in order to
- give the right results. Ick. */
- while ((ch = getc (fp)) != EOF)
- {
- total_bytes++;
- ROTATE_RIGHT (checksum);
- checksum += ch;
- checksum &= 0xffff; /* Keep it within bounds. */
- }
-
- if (ferror (fp))
- {
- error (0, errno, "%s", file);
- if (strcmp (file, "-"))
- fclose (fp);
- return -1;
- }
-
- if (strcmp (file, "-") && fclose (fp) == EOF)
- {
- error (0, errno, "%s", file);
- return -1;
- }
-
- printf ("%05lu %5ld", checksum, (total_bytes + 1024 - 1) / 1024);
- if (print_name > 1)
- printf (" %s", file);
- putchar ('\n');
-
- return 0;
- }
-
- /* 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 0 if successful, -1 if an error occurs. */
-
- static int
- sysv_sum_file (file, print_name)
- char *file;
- int print_name;
- {
- int fd;
- unsigned char buf[8192];
- register int bytes_read;
- register unsigned long checksum = 0;
- long total_bytes = 0;
-
- if (!strcmp (file, "-"))
- {
- fd = 0;
- have_read_stdin = 1;
- }
- else
- {
- fd = open (file, O_RDONLY);
- if (fd == -1)
- {
- error (0, errno, "%s", file);
- return -1;
- }
- }
-
- while ((bytes_read = safe_read (fd, buf, sizeof buf)) > 0)
- {
- register int i;
-
- for (i = 0; i < bytes_read; i++)
- checksum += buf[i];
- total_bytes += bytes_read;
- }
-
- if (bytes_read < 0)
- {
- error (0, errno, "%s", file);
- if (strcmp (file, "-"))
- close (fd);
- return -1;
- }
-
- if (strcmp (file, "-") && close (fd) == -1)
- {
- error (0, errno, "%s", file);
- return -1;
- }
-
- printf ("%lu %ld", checksum % 0xffff, (total_bytes + 512 - 1) / 512);
- if (print_name)
- printf (" %s", file);
- putchar ('\n');
-
- return 0;
- }
-