/* sum -- checksum and count the blocks in a file Copyright (C) 86, 89, 91, 1995-2002, 2004, 2005 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 #include #include #include #include "system.h" #include "error.h" #include "human.h" #include "safe-read.h" /* The official name of this program (e.g., no `g' prefix). */ #define PROGRAM_NAME "sum" #define AUTHORS "Kayvan Aghaiepour", "David MacKenzie" /* The name this program was run with. */ char *program_name; /* True if any of the files read were the standard input. */ static bool have_read_stdin; static struct option const longopts[] = { {"sysv", no_argument, NULL, 's'}, {GETOPT_HELP_OPTION_DECL}, {GETOPT_VERSION_OPTION_DECL}, {NULL, 0, NULL, 0} }; void usage (int status) { if (status != EXIT_SUCCESS) fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name); else { printf (_("\ Usage: %s [OPTION]... [FILE]...\n\ "), program_name); fputs (_("\ Print checksum and block counts for each FILE.\n\ \n\ -r defeat -s, use BSD sum algorithm, use 1K blocks\n\ -s, --sysv use System V sum algorithm, use 512 bytes blocks\n\ "), stdout); fputs (HELP_OPTION_DESCRIPTION, stdout); fputs (VERSION_OPTION_DESCRIPTION, stdout); fputs (_("\ \n\ With no FILE, or when FILE is -, read standard input.\n\ "), stdout); printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); } exit (status); } /* 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 true if successful. */ static bool bsd_sum_file (const char *file, int print_name) { FILE *fp; int checksum = 0; /* The checksum mod 2^16. */ uintmax_t total_bytes = 0; /* The number of bytes. */ int ch; /* Each character read. */ char hbuf[LONGEST_HUMAN_READABLE + 1]; if (STREQ (file, "-")) { fp = stdin; have_read_stdin = true; } else { fp = fopen (file, "r"); if (fp == NULL) { error (0, errno, "%s", file); return false; } } /* Need binary I/O, or else byte counts and checksums are incorrect. */ SET_BINARY (fileno(fp)); while ((ch = getc (fp)) != EOF) { total_bytes++; checksum = (checksum >> 1) + ((checksum & 1) << 15); checksum += ch; checksum &= 0xffff; /* Keep it within bounds. */ } if (ferror (fp)) { error (0, errno, "%s", file); if (!STREQ (file, "-")) fclose (fp); return false; } if (!STREQ (file, "-") && fclose (fp) == EOF) { error (0, errno, "%s", file); return false; } printf ("%05d %5s", checksum, human_readable (total_bytes, hbuf, human_ceiling, 1, 1024)); if (print_name > 1) printf (" %s", file); putchar ('\n'); return true; } /* 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 true if successful. */ static bool sysv_sum_file (const char *file, int print_name) { int fd; unsigned char buf[8192]; uintmax_t total_bytes = 0; char hbuf[LONGEST_HUMAN_READABLE + 1]; int r; int checksum; /* The sum of all the input bytes, modulo (UINT_MAX + 1). */ unsigned int s = 0; if (STREQ (file, "-")) { fd = 0; have_read_stdin = true; } else { fd = open (file, O_RDONLY); if (fd == -1) { error (0, errno, "%s", file); return false; } } /* Need binary I/O, or else byte counts and checksums are incorrect. */ SET_BINARY (fd); while (1) { size_t i; size_t bytes_read = safe_read (fd, buf, sizeof buf); if (bytes_read == 0) break; if (bytes_read == SAFE_READ_ERROR) { error (0, errno, "%s", file); if (!STREQ (file, "-")) close (fd); return false; } for (i = 0; i < bytes_read; i++) s += buf[i]; total_bytes += bytes_read; } if (!STREQ (file, "-") && close (fd) == -1) { error (0, errno, "%s", file); return false; } r = (s & 0xffff) + ((s & 0xffffffff) >> 16); checksum = (r & 0xffff) + (r >> 16); printf ("%d %s", checksum, human_readable (total_bytes, hbuf, human_ceiling, 1, 512)); if (print_name) printf (" %s", file); putchar ('\n'); return true; } int main (int argc, char **argv) { bool ok; int optc; int files_given; bool (*sum_func) (const char *, int) = bsd_sum_file; initialize_main (&argc, &argv); program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); atexit (close_stdout); have_read_stdin = false; while ((optc = getopt_long (argc, argv, "rs", longopts, NULL)) != -1) { switch (optc) { case 'r': /* For SysV compatibility. */ sum_func = bsd_sum_file; break; case 's': sum_func = sysv_sum_file; break; case_GETOPT_HELP_CHAR; case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); default: usage (EXIT_FAILURE); } } files_given = argc - optind; if (files_given <= 0) ok = sum_func ("-", files_given); else for (ok = true; optind < argc; optind++) ok &= sum_func (argv[optind], files_given); if (have_read_stdin && fclose (stdin) == EOF) error (EXIT_FAILURE, errno, "-"); exit (ok ? EXIT_SUCCESS : EXIT_FAILURE); }