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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 <stdio.h>
#include <sys/types.h>
#include <getopt.h>
#include "system.h"
int bsd_sum_file ();
int sysv_sum_file ();
void error ();
/* The name this program was run with. */
char *program_name;
/* Nonzero if any of the files read were the standard input. */
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;
struct option longopts[] =
{
{"sysv", 0, NULL, 's'},
{NULL, 0, NULL, 0}
};
void
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 'r': /* For SysV compatibility. */
sum_func = bsd_sum_file;
break;
case 's':
sum_func = sysv_sum_file;
break;
case '?':
fprintf (stderr, "\
Usage: %s [-rs] [--sysv] [file...]\n", argv[0]);
exit (1);
}
}
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. */
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. */
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 = 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;
}
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