Initial revision

1 files changed, 217 insertions, 0 deletions

diff --git a/src/sum.c b/src/sum.c
new file mode 100644
index 000000000..9236614ca
--- /dev/null
+++ b/src/sum.c
@@ -0,0 +1,217 @@
+/* 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;
+}