src/sum.c

   1 /* sum -- checksum and count the blocks in a file
   2    Copyright (C) 86, 89, 91, 95, 1996 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Like BSD sum or SysV sum -r, except like SysV sum if -s option is given. */
  19
  20 /* Written by Kayvan Aghaiepour and David MacKenzie. */
  21
  22 #include <config.h>
  23
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26 #include <getopt.h>
  27 #include "system.h"
  28 #include "error.h"
  29
  30 int safe_read ();
  31
  32 /* The name this program was run with. */
  33 char *program_name;
  34
  35 /* Nonzero if any of the files read were the standard input. */
  36 static int have_read_stdin;
  37
  38 /* Right-rotate 32-bit integer variable C. */
  39 #define ROTATE_RIGHT(c) if ((c) & 01) (c) = ((c) >>1) + 0x8000; else (c) >>= 1;
  40
  41 /* If nonzero, display usage information and exit.  */
  42 static int show_help;
  43
  44 /* If nonzero, print the version on standard output then exit.  */
  45 static int show_version;
  46
  47 static struct option const longopts[] =
  48 {
  49   {"sysv", no_argument, NULL, 's'},
  50   {"help", no_argument, &show_help, 1},
  51   {"version", no_argument, &show_version, 1},
  52   {NULL, 0, NULL, 0}
  53 };
  54
  55 static void
  56 usage (int status)
  57 {
  58   if (status != 0)
  59     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  60              program_name);
  61   else
  62     {
  63       printf (_("\
  64 Usage: %s [OPTION]... [FILE]...\n\
  65 "),
  66               program_name);
  67       printf (_("\
  68 Print checksum and block counts for each FILE.\n\
  69 \n\
  70   -r              defeat -s, use BSD sum algorithm, use 1K blocks\n\
  71   -s, --sysv      use System V sum algorithm, use 512 bytes blocks\n\
  72       --help      display this help and exit\n\
  73       --version   output version information and exit\n\
  74 \n\
  75 With no FILE, or when FILE is -, read standard input.\n\
  76 "));
  77       puts (_("\nReport bugs to textutils-bugs@gnu.ai.mit.edu"));
  78     }
  79   exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
  80 }
  81
  82 /* Calculate and print the rotated checksum and the size in 1K blocks
  83    of file FILE, or of the standard input if FILE is "-".
  84    If PRINT_NAME is >1, print FILE next to the checksum and size.
  85    The checksum varies depending on sizeof(int).
  86    Return 0 if successful, -1 if an error occurs. */
  87
  88 static int
  89 bsd_sum_file (const char *file, int print_name)
  90 {
  91   register FILE *fp;
  92   register unsigned long checksum = 0; /* The checksum mod 2^16. */
  93   register long total_bytes = 0; /* The number of bytes. */
  94   register int ch;              /* Each character read. */
  95
  96   if (!strcmp (file, "-"))
  97     {
  98       fp = stdin;
  99       have_read_stdin = 1;
 100     }
 101   else
 102     {
 103       fp = fopen (file, "r");
 104       if (fp == NULL)
 105         {
 106           error (0, errno, "%s", file);
 107           return -1;
 108         }
 109     }
 110
 111   while ((ch = getc (fp)) != EOF)
 112     {
 113       total_bytes++;
 114       ROTATE_RIGHT (checksum);
 115       checksum += ch;
 116       checksum &= 0xffff;       /* Keep it within bounds. */
 117     }
 118
 119   if (ferror (fp))
 120     {
 121       error (0, errno, "%s", file);
 122       if (strcmp (file, "-"))
 123         fclose (fp);
 124       return -1;
 125     }
 126
 127   if (strcmp (file, "-") && fclose (fp) == EOF)
 128     {
 129       error (0, errno, "%s", file);
 130       return -1;
 131     }
 132
 133   printf ("%05lu %5ld", checksum, (total_bytes + 1024 - 1) / 1024);
 134   if (print_name > 1)
 135     printf (" %s", file);
 136   putchar ('\n');
 137
 138   return 0;
 139 }
 140
 141 /* Calculate and print the checksum and the size in 512-byte blocks
 142    of file FILE, or of the standard input if FILE is "-".
 143    If PRINT_NAME is >0, print FILE next to the checksum and size.
 144    Return 0 if successful, -1 if an error occurs. */
 145
 146 static int
 147 sysv_sum_file (const char *file, int print_name)
 148 {
 149   int fd;
 150   unsigned char buf[8192];
 151   register int bytes_read;
 152   register unsigned long checksum = 0;
 153   long total_bytes = 0;
 154
 155   if (!strcmp (file, "-"))
 156     {
 157       fd = 0;
 158       have_read_stdin = 1;
 159     }
 160   else
 161     {
 162       fd = open (file, O_RDONLY);
 163       if (fd == -1)
 164         {
 165           error (0, errno, "%s", file);
 166           return -1;
 167         }
 168     }
 169
 170   while ((bytes_read = safe_read (fd, buf, sizeof buf)) > 0)
 171     {
 172       register int i;
 173
 174       for (i = 0; i < bytes_read; i++)
 175         checksum += buf[i];
 176       total_bytes += bytes_read;
 177     }
 178
 179   if (bytes_read < 0)
 180     {
 181       error (0, errno, "%s", file);
 182       if (strcmp (file, "-"))
 183         close (fd);
 184       return -1;
 185     }
 186
 187   if (strcmp (file, "-") && close (fd) == -1)
 188     {
 189       error (0, errno, "%s", file);
 190       return -1;
 191     }
 192
 193   printf ("%lu %ld", checksum % 0xffff, (total_bytes + 512 - 1) / 512);
 194   if (print_name)
 195     printf (" %s", file);
 196   putchar ('\n');
 197
 198   return 0;
 199 }
 200
 201 int
 202 main (int argc, char **argv)
 203 {
 204   int errors = 0;
 205   int optc;
 206   int files_given;
 207   int (*sum_func) () = bsd_sum_file;
 208
 209   program_name = argv[0];
 210   setlocale (LC_ALL, "");
 211   bindtextdomain (PACKAGE, LOCALEDIR);
 212   textdomain (PACKAGE);
 213
 214   have_read_stdin = 0;
 215
 216   while ((optc = getopt_long (argc, argv, "rs", longopts, (int *) 0)) != -1)
 217     {
 218       switch (optc)
 219         {
 220         case 0:
 221           break;
 222
 223         case 'r':               /* For SysV compatibility. */
 224           sum_func = bsd_sum_file;
 225           break;
 226
 227         case 's':
 228           sum_func = sysv_sum_file;
 229           break;
 230
 231         default:
 232           usage (1);
 233         }
 234     }
 235
 236   if (show_version)
 237     {
 238       printf ("sum (%s) %s\n", GNU_PACKAGE, VERSION);
 239       exit (EXIT_SUCCESS);
 240     }
 241
 242   if (show_help)
 243     usage (0);
 244
 245   files_given = argc - optind;
 246   if (files_given == 0)
 247     {
 248       if ((*sum_func) ("-", files_given) < 0)
 249         errors = 1;
 250     }
 251   else
 252     for (; optind < argc; optind++)
 253       if ((*sum_func) (argv[optind], files_given) < 0)
 254         errors = 1;
 255
 256   if (have_read_stdin && fclose (stdin) == EOF)
 257     error (EXIT_FAILURE, errno, "-");
 258   exit (errors == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
 259 }
 260