src/sum.c

   1 /* sum -- checksum and count the blocks in a file
   2    Copyright (C) 86, 89, 91, 1995-2000 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 Foundation,
  16    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 "closeout.h"
  29 #include "error.h"
  30 #include "safe-read.h"
  31
  32 /* The official name of this program (e.g., no `g' prefix).  */
  33 #define PROGRAM_NAME "sum"
  34
  35 #define AUTHORS "Kayvan Aghaiepour and David MacKenzie"
  36
  37 /* The name this program was run with. */
  38 char *program_name;
  39
  40 /* Nonzero if any of the files read were the standard input. */
  41 static int have_read_stdin;
  42
  43 /* Right-rotate 32-bit integer variable C. */
  44 #define ROTATE_RIGHT(c) if ((c) & 01) (c) = ((c) >>1) + 0x8000; else (c) >>= 1;
  45
  46 static struct option const longopts[] =
  47 {
  48   {"sysv", no_argument, NULL, 's'},
  49   {GETOPT_HELP_OPTION_DECL},
  50   {GETOPT_VERSION_OPTION_DECL},
  51   {NULL, 0, NULL, 0}
  52 };
  53
  54 void
  55 usage (int status)
  56 {
  57   if (status != 0)
  58     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  59              program_name);
  60   else
  61     {
  62       printf (_("\
  63 Usage: %s [OPTION]... [FILE]...\n\
  64 "),
  65               program_name);
  66       printf (_("\
  67 Print checksum and block counts for each FILE.\n\
  68 \n\
  69   -r              defeat -s, use BSD sum algorithm, use 1K blocks\n\
  70   -s, --sysv      use System V sum algorithm, use 512 bytes blocks\n\
  71       --help      display this help and exit\n\
  72       --version   output version information and exit\n\
  73 \n\
  74 With no FILE, or when FILE is -, read standard input.\n\
  75 "));
  76       puts (_("\nReport bugs to <bug-textutils@gnu.org>."));
  77     }
  78   exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
  79 }
  80
  81 /* Calculate and print the rotated checksum and the size in 1K blocks
  82    of file FILE, or of the standard input if FILE is "-".
  83    If PRINT_NAME is >1, print FILE next to the checksum and size.
  84    The checksum varies depending on sizeof(int).
  85    Return 0 if successful, -1 if an error occurs. */
  86
  87 static int
  88 bsd_sum_file (const char *file, int print_name)
  89 {
  90   register FILE *fp;
  91   register unsigned long checksum = 0; /* The checksum mod 2^16. */
  92   register long total_bytes = 0; /* The number of bytes. */
  93   register int ch;              /* Each character read. */
  94
  95   if (STREQ (file, "-"))
  96     {
  97       fp = stdin;
  98       have_read_stdin = 1;
  99     }
 100   else
 101     {
 102       fp = fopen (file, "r");
 103       if (fp == NULL)
 104         {
 105           error (0, errno, "%s", file);
 106           return -1;
 107         }
 108     }
 109   /* Need binary I/O, or else byte counts and checksums are incorrect.  */
 110   SET_BINARY (fileno(fp));
 111
 112   while ((ch = getc (fp)) != EOF)
 113     {
 114       total_bytes++;
 115       ROTATE_RIGHT (checksum);
 116       checksum += ch;
 117       checksum &= 0xffff;       /* Keep it within bounds. */
 118     }
 119
 120   if (ferror (fp))
 121     {
 122       error (0, errno, "%s", file);
 123       if (!STREQ (file, "-"))
 124         fclose (fp);
 125       return -1;
 126     }
 127
 128   if (!STREQ (file, "-") && fclose (fp) == EOF)
 129     {
 130       error (0, errno, "%s", file);
 131       return -1;
 132     }
 133
 134   printf ("%05lu %5ld", checksum, (total_bytes + 1024 - 1) / 1024);
 135   if (print_name > 1)
 136     printf (" %s", file);
 137   putchar ('\n');
 138
 139   return 0;
 140 }
 141
 142 /* Calculate and print the checksum and the size in 512-byte blocks
 143    of file FILE, or of the standard input if FILE is "-".
 144    If PRINT_NAME is >0, print FILE next to the checksum and size.
 145    Return 0 if successful, -1 if an error occurs. */
 146
 147 static int
 148 sysv_sum_file (const char *file, int print_name)
 149 {
 150   int fd;
 151   unsigned char buf[8192];
 152   register int bytes_read;
 153   register unsigned long checksum = 0;
 154   long total_bytes = 0;
 155
 156   if (STREQ (file, "-"))
 157     {
 158       fd = 0;
 159       have_read_stdin = 1;
 160     }
 161   else
 162     {
 163       fd = open (file, O_RDONLY);
 164       if (fd == -1)
 165         {
 166           error (0, errno, "%s", file);
 167           return -1;
 168         }
 169     }
 170   /* Need binary I/O, or else byte counts and checksums are incorrect.  */
 171   SET_BINARY (fd);
 172
 173   while ((bytes_read = safe_read (fd, buf, sizeof buf)) > 0)
 174     {
 175       register int i;
 176
 177       for (i = 0; i < bytes_read; i++)
 178         checksum += buf[i];
 179       /* Reduce checksum mod 0xffff, to avoid overflow.  */
 180       checksum = (checksum & 0xffff) + (checksum >> 16);
 181
 182       total_bytes += bytes_read;
 183     }
 184
 185   if (bytes_read < 0)
 186     {
 187       error (0, errno, "%s", file);
 188       if (!STREQ (file, "-"))
 189         close (fd);
 190       return -1;
 191     }
 192
 193   if (!STREQ (file, "-") && close (fd) == -1)
 194     {
 195       error (0, errno, "%s", file);
 196       return -1;
 197     }
 198
 199   printf ("%lu %ld", checksum % 0xffff, (total_bytes + 512 - 1) / 512);
 200   if (print_name)
 201     printf (" %s", file);
 202   putchar ('\n');
 203
 204   return 0;
 205 }
 206
 207 int
 208 main (int argc, char **argv)
 209 {
 210   int errors = 0;
 211   int optc;
 212   int files_given;
 213   int (*sum_func) () = bsd_sum_file;
 214
 215   program_name = argv[0];
 216   setlocale (LC_ALL, "");
 217   bindtextdomain (PACKAGE, LOCALEDIR);
 218   textdomain (PACKAGE);
 219
 220   atexit (close_stdout);
 221
 222   have_read_stdin = 0;
 223
 224   while ((optc = getopt_long (argc, argv, "rs", longopts, NULL)) != -1)
 225     {
 226       switch (optc)
 227         {
 228         case 0:
 229           break;
 230
 231         case 'r':               /* For SysV compatibility. */
 232           sum_func = bsd_sum_file;
 233           break;
 234
 235         case 's':
 236           sum_func = sysv_sum_file;
 237           break;
 238
 239         case_GETOPT_HELP_CHAR;
 240
 241         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 242
 243         default:
 244           usage (1);
 245         }
 246     }
 247
 248   files_given = argc - optind;
 249   if (files_given == 0)
 250     {
 251       if ((*sum_func) ("-", files_given) < 0)
 252         errors = 1;
 253     }
 254   else
 255     for (; optind < argc; optind++)
 256       if ((*sum_func) (argv[optind], files_given) < 0)
 257         errors = 1;
 258
 259   if (have_read_stdin && fclose (stdin) == EOF)
 260     error (EXIT_FAILURE, errno, "-");
 261   exit (errors == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
 262 }