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+/* sum -- checksum and count the blocks in a file
+ Copyright (C) 86, 89, 91, 1995-2002, 2004, 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 "error.h"
+#include "human.h"
+#include "safe-read.h"
+
+/* The official name of this program (e.g., no `g' prefix). */
+#define PROGRAM_NAME "sum"
+
+#define AUTHORS "Kayvan Aghaiepour", "David MacKenzie"
+
+/* The name this program was run with. */
+char *program_name;
+
+/* True if any of the files read were the standard input. */
+static bool have_read_stdin;
+
+static struct option const longopts[] =
+{
+ {"sysv", no_argument, NULL, 's'},
+ {GETOPT_HELP_OPTION_DECL},
+ {GETOPT_VERSION_OPTION_DECL},
+ {NULL, 0, NULL, 0}
+};
+
+void
+usage (int status)
+{
+ if (status != EXIT_SUCCESS)
+ fprintf (stderr, _("Try `%s --help' for more information.\n"),
+ program_name);
+ else
+ {
+ printf (_("\
+Usage: %s [OPTION]... [FILE]...\n\
+"),
+ program_name);
+ fputs (_("\
+Print checksum and block counts for each FILE.\n\
+\n\
+ -r defeat -s, use BSD sum algorithm, use 1K blocks\n\
+ -s, --sysv use System V sum algorithm, use 512 bytes blocks\n\
+"), stdout);
+ fputs (HELP_OPTION_DESCRIPTION, stdout);
+ fputs (VERSION_OPTION_DESCRIPTION, stdout);
+ fputs (_("\
+\n\
+With no FILE, or when FILE is -, read standard input.\n\
+"), stdout);
+ printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
+ }
+ exit (status);
+}
+
+/* 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 true if successful. */
+
+static bool
+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. */
+ char hbuf[LONGEST_HUMAN_READABLE + 1];
+ bool is_stdin = STREQ (file, "-");
+
+ if (is_stdin)
+ {
+ fp = stdin;
+ have_read_stdin = true;
+ if (O_BINARY && ! isatty (STDIN_FILENO))
+ freopen (NULL, "rb", stdin);
+ }
+ else
+ {
+ fp = fopen (file, (O_BINARY ? "rb" : "r"));
+ if (fp == NULL)
+ {
+ error (0, errno, "%s", file);
+ return false;
+ }
+ }
+
+ while ((ch = getc (fp)) != EOF)
+ {
+ total_bytes++;
+ checksum = (checksum >> 1) + ((checksum & 1) << 15);
+ checksum += ch;
+ checksum &= 0xffff; /* Keep it within bounds. */
+ }
+
+ if (ferror (fp))
+ {
+ error (0, errno, "%s", file);
+ if (!is_stdin)
+ fclose (fp);
+ return false;
+ }
+
+ if (!is_stdin && fclose (fp) != 0)
+ {
+ error (0, errno, "%s", file);
+ return false;
+ }
+
+ printf ("%05d %5s", checksum,
+ human_readable (total_bytes, hbuf, human_ceiling, 1, 1024));
+ if (print_name > 1)
+ printf (" %s", file);
+ putchar ('\n');
+
+ return true;
+}
+
+/* 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 true if successful. */
+
+static bool
+sysv_sum_file (const char *file, int print_name)
+{
+ int fd;
+ unsigned char buf[8192];
+ uintmax_t total_bytes = 0;
+ char hbuf[LONGEST_HUMAN_READABLE + 1];
+ int r;
+ int checksum;
+
+ /* The sum of all the input bytes, modulo (UINT_MAX + 1). */
+ unsigned int s = 0;
+
+ bool is_stdin = STREQ (file, "-");
+
+ if (is_stdin)
+ {
+ fd = STDIN_FILENO;
+ have_read_stdin = true;
+ if (O_BINARY && ! isatty (STDIN_FILENO))
+ freopen (NULL, "rb", stdin);
+ }
+ else
+ {
+ fd = open (file, O_RDONLY | O_BINARY);
+ if (fd == -1)
+ {
+ error (0, errno, "%s", file);
+ return false;
+ }
+ }
+
+ while (1)
+ {
+ size_t i;
+ size_t bytes_read = safe_read (fd, buf, sizeof buf);
+
+ if (bytes_read == 0)
+ break;
+
+ if (bytes_read == SAFE_READ_ERROR)
+ {
+ error (0, errno, "%s", file);
+ if (!is_stdin)
+ close (fd);
+ return false;
+ }
+
+ for (i = 0; i < bytes_read; i++)
+ s += buf[i];
+ total_bytes += bytes_read;
+ }
+
+ if (!is_stdin && close (fd) != 0)
+ {
+ error (0, errno, "%s", file);
+ return false;
+ }
+
+ r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
+ checksum = (r & 0xffff) + (r >> 16);
+
+ printf ("%d %s", checksum,
+ human_readable (total_bytes, hbuf, human_ceiling, 1, 512));
+ if (print_name)
+ printf (" %s", file);
+ putchar ('\n');
+
+ return true;
+}
+
+int
+main (int argc, char **argv)
+{
+ bool ok;
+ int optc;
+ int files_given;
+ bool (*sum_func) (const char *, int) = bsd_sum_file;
+
+ initialize_main (&argc, &argv);
+ program_name = argv[0];
+ setlocale (LC_ALL, "");
+ bindtextdomain (PACKAGE, LOCALEDIR);
+ textdomain (PACKAGE);
+
+ atexit (close_stdout);
+
+ have_read_stdin = false;
+
+ while ((optc = getopt_long (argc, argv, "rs", longopts, NULL)) != -1)
+ {
+ switch (optc)
+ {
+ case 'r': /* For SysV compatibility. */
+ sum_func = bsd_sum_file;
+ break;
+
+ case 's':
+ sum_func = sysv_sum_file;
+ break;
+
+ case_GETOPT_HELP_CHAR;
+
+ case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+
+ default:
+ usage (EXIT_FAILURE);
+ }
+ }
+
+ files_given = argc - optind;
+ if (files_given <= 0)
+ ok = sum_func ("-", files_given);
+ else
+ for (ok = true; optind < argc; optind++)
+ ok &= sum_func (argv[optind], files_given);
+
+ if (have_read_stdin && fclose (stdin) == EOF)
+ error (EXIT_FAILURE, errno, "-");
+ exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
+}
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