/* 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. */ #ifdef HAVE_CONFIG_H #if defined (CONFIG_BROKETS) /* We use instead of "config.h" so that a compilation using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h (which it would do because it found this file in $srcdir). */ #include #else #include "config.h" #endif #endif #include #include #include #include "system.h" #include "version.h" static int bsd_sum_file (); static 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. */ static 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; /* If non-zero, display usage information and exit. */ static int show_help; /* If non-zero, print the version on standard output then exit. */ static int show_version; static struct option const longopts[] = { {"sysv", no_argument, NULL, 's'}, {"help", no_argument, &show_help, 1}, {"version", no_argument, &show_version, 1}, {NULL, 0, NULL, 0} }; static void usage (status) int status; { if (status != 0) fprintf (stderr, "Try `%s --help' for more information.\n", program_name); else { print_version("sum"); printf ("\ Usage: %s [OPTION]... [FILE]...\n\ ", program_name); printf ("\ \n\ -r defeat -s, use BSD sum algorithm, use 1K blocks\n\ -s, --sysv use System V sum algorithm, use 512 bytes blocks\n\ --help display this help and exit\n\ --version output version information and exit\n\ \n\ With no FILE, or when FILE is -, read standard input.\n\ "); } exit (status); } 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 0: break; case 'r': /* For SysV compatibility. */ sum_func = bsd_sum_file; break; case 's': sum_func = sysv_sum_file; break; default: usage (1); } } if (show_version) { printf ("%s\n", version_string); exit (0); } if (show_help) usage (0); files_given = argc - optind; if (files_given == 0) { if (isatty (0)) usage (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. */ static 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; #ifdef OS2 setmode(0, O_BINARY); #endif } else { fp = fopen (file, "rb"); 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. */ static 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; #ifdef OS2 setmode(0, O_BINARY); #endif } else { fd = open (file, O_RDONLY | O_BINARY); 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; }