src/sum.c

   1 /* sum -- checksum and count the blocks in a file
   2    Copyright (C) 86, 89, 91, 1995-1999 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 #include "safe-read.h"
  30
  31 /* The official name of this program (e.g., no `g' prefix).  */
  32 #define PROGRAM_NAME "sum"
  33
  34 #define AUTHORS "Kayvan Aghaiepour and David MacKenzie"
  35
  36 /* The name this program was run with. */
  37 char *program_name;
  38
  39 /* Nonzero if any of the files read were the standard input. */
  40 static int have_read_stdin;
  41
  42 /* Right-rotate 32-bit integer variable C. */
  43 #define ROTATE_RIGHT(c) if ((c) & 01) (c) = ((c) >>1) + 0x8000; else (c) >>= 1;
  44
  45 static struct option const longopts[] =
  46 {
  47   {"sysv", no_argument, NULL, 's'},
  48   {GETOPT_HELP_OPTION_DECL},
  49   {GETOPT_VERSION_OPTION_DECL},
  50   {NULL, 0, NULL, 0}
  51 };
  52
  53 void
  54 usage (int status)
  55 {
  56   if (status != 0)
  57     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  58              program_name);
  59   else
  60     {
  61       printf (_("\
  62 Usage: %s [OPTION]... [FILE]...\n\
  63 "),
  64               program_name);
  65       printf (_("\
  66 Print checksum and block counts for each FILE.\n\
  67 \n\
  68   -r              defeat -s, use BSD sum algorithm, use 1K blocks\n\
  69   -s, --sysv      use System V sum algorithm, use 512 bytes blocks\n\
  70       --help      display this help and exit\n\
  71       --version   output version information and exit\n\
  72 \n\
  73 With no FILE, or when FILE is -, read standard input.\n\
  74 "));
  75       puts (_("\nReport bugs to <bug-textutils@gnu.org>."));
  76     }
  77   exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
  78 }
  79
  80 /* Calculate and print the rotated checksum and the size in 1K blocks
  81    of file FILE, or of the standard input if FILE is "-".
  82    If PRINT_NAME is >1, print FILE next to the checksum and size.
  83    The checksum varies depending on sizeof(int).
  84    Return 0 if successful, -1 if an error occurs. */
  85
  86 static int
  87 bsd_sum_file (const char *file, int print_name)
  88 {
  89   register FILE *fp;
  90   register unsigned long checksum = 0; /* The checksum mod 2^16. */
  91   register long total_bytes = 0; /* The number of bytes. */
  92   register int ch;              /* Each character read. */
  93
  94   if (STREQ (file, "-"))
  95     {
  96       fp = stdin;
  97       have_read_stdin = 1;
  98     }
  99   else
 100     {
 101       fp = fopen (file, "r");
 102       if (fp == NULL)
 103         {
 104           error (0, errno, "%s", file);
 105           return -1;
 106         }
 107     }
 108   /* Need binary I/O, or else byte counts and checksums are incorrect.  */
 109   SET_BINARY (fileno(fp));
 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 (!STREQ (file, "-"))
 123         fclose (fp);
 124       return -1;
 125     }
 126
 127   if (!STREQ (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 (STREQ (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   /* Need binary I/O, or else byte counts and checksums are incorrect.  */
 170   SET_BINARY (fd);
 171
 172   while ((bytes_read = safe_read (fd, buf, sizeof buf)) > 0)
 173     {
 174       register int i;
 175
 176       for (i = 0; i < bytes_read; i++)
 177         checksum += buf[i];
 178       total_bytes += bytes_read;
 179     }
 180
 181   if (bytes_read < 0)
 182     {
 183       error (0, errno, "%s", file);
 184       if (!STREQ (file, "-"))
 185         close (fd);
 186       return -1;
 187     }
 188
 189   if (!STREQ (file, "-") && close (fd) == -1)
 190     {
 191       error (0, errno, "%s", file);
 192       return -1;
 193     }
 194
 195   printf ("%lu %ld", checksum % 0xffff, (total_bytes + 512 - 1) / 512);
 196   if (print_name)
 197     printf (" %s", file);
 198   putchar ('\n');
 199
 200   return 0;
 201 }
 202
 203 int
 204 main (int argc, char **argv)
 205 {
 206   int errors = 0;
 207   int optc;
 208   int files_given;
 209   int (*sum_func) () = bsd_sum_file;
 210
 211   program_name = argv[0];
 212   setlocale (LC_ALL, "");
 213   bindtextdomain (PACKAGE, LOCALEDIR);
 214   textdomain (PACKAGE);
 215
 216   have_read_stdin = 0;
 217
 218   while ((optc = getopt_long (argc, argv, "rs", longopts, NULL)) != -1)
 219     {
 220       switch (optc)
 221         {
 222         case 0:
 223           break;
 224
 225         case 'r':               /* For SysV compatibility. */
 226           sum_func = bsd_sum_file;
 227           break;
 228
 229         case 's':
 230           sum_func = sysv_sum_file;
 231           break;
 232
 233         case_GETOPT_HELP_CHAR;
 234
 235         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 236
 237         default:
 238           usage (1);
 239         }
 240     }
 241
 242   files_given = argc - optind;
 243   if (files_given == 0)
 244     {
 245       if ((*sum_func) ("-", files_given) < 0)
 246         errors = 1;
 247     }
 248   else
 249     for (; optind < argc; optind++)
 250       if ((*sum_func) (argv[optind], files_given) < 0)
 251         errors = 1;
 252
 253   if (have_read_stdin && fclose (stdin) == EOF)
 254     error (EXIT_FAILURE, errno, "-");
 255   exit (errors == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
 256 }