home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OS/2 Shareware BBS: 11 Util
/
11-Util.zip
/
txtut122.zip
/
textutil
/
src
/
sum.c
< prev
next >
Wrap
C/C++ Source or Header
|
1998-04-11
|
6KB
|
268 lines
/* sum -- checksum and count the blocks in a file
Copyright (C) 86, 89, 91, 95, 1996 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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"
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 nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, 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 (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 (_("\
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\
--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\
"));
puts (_("\nReport bugs to textutils-bugs@gnu.ai.mit.edu"));
}
exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
/* 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 (const 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;
}
}
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 (const 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;
}
int
main (int argc, char **argv)
{
int errors = 0;
int optc;
int files_given;
int (*sum_func) () = bsd_sum_file;
#ifdef __EMX__
_wildcard(&argc, &argv);
#endif
program_name = argv[0];
#ifndef __EMX__
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
#endif
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) %s\n", GNU_PACKAGE, VERSION);
exit (EXIT_SUCCESS);
}
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 (EXIT_FAILURE, errno, "-");
exit (errors == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}