global: convert indentation-TABs to spaces
[coreutils.git] / src / sum.c
blobe53bad2ca61bd3ce59b3ec861105a8d0a12a10ca
1 /* sum -- checksum and count the blocks in a file
2 Copyright (C) 86, 89, 91, 1995-2002, 2004, 2005,
3 2008-2009 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Like BSD sum or SysV sum -r, except like SysV sum if -s option is given. */
20 /* Written by Kayvan Aghaiepour and David MacKenzie. */
22 #include <config.h>
24 #include <stdio.h>
25 #include <sys/types.h>
26 #include <getopt.h>
27 #include "system.h"
28 #include "error.h"
29 #include "human.h"
30 #include "safe-read.h"
31 #include "xfreopen.h"
33 /* The official name of this program (e.g., no `g' prefix). */
34 #define PROGRAM_NAME "sum"
36 #define AUTHORS \
37 proper_name ("Kayvan Aghaiepour"), \
38 proper_name ("David MacKenzie")
40 /* True if any of the files read were the standard input. */
41 static bool have_read_stdin;
43 static struct option const longopts[] =
45 {"sysv", no_argument, NULL, 's'},
46 {GETOPT_HELP_OPTION_DECL},
47 {GETOPT_VERSION_OPTION_DECL},
48 {NULL, 0, NULL, 0}
51 void
52 usage (int status)
54 if (status != EXIT_SUCCESS)
55 fprintf (stderr, _("Try `%s --help' for more information.\n"),
56 program_name);
57 else
59 printf (_("\
60 Usage: %s [OPTION]... [FILE]...\n\
61 "),
62 program_name);
63 fputs (_("\
64 Print checksum and block counts for each FILE.\n\
65 \n\
66 -r use BSD sum algorithm, use 1K blocks\n\
67 -s, --sysv use System V sum algorithm, use 512 bytes blocks\n\
68 "), stdout);
69 fputs (HELP_OPTION_DESCRIPTION, stdout);
70 fputs (VERSION_OPTION_DESCRIPTION, stdout);
71 fputs (_("\
72 \n\
73 With no FILE, or when FILE is -, read standard input.\n\
74 "), stdout);
75 emit_bug_reporting_address ();
77 exit (status);
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 true if successful. */
86 static bool
87 bsd_sum_file (const char *file, int print_name)
89 FILE *fp;
90 int checksum = 0; /* The checksum mod 2^16. */
91 uintmax_t total_bytes = 0; /* The number of bytes. */
92 int ch; /* Each character read. */
93 char hbuf[LONGEST_HUMAN_READABLE + 1];
94 bool is_stdin = STREQ (file, "-");
96 if (is_stdin)
98 fp = stdin;
99 have_read_stdin = true;
100 if (O_BINARY && ! isatty (STDIN_FILENO))
101 xfreopen (NULL, "rb", stdin);
103 else
105 fp = fopen (file, (O_BINARY ? "rb" : "r"));
106 if (fp == NULL)
108 error (0, errno, "%s", file);
109 return false;
113 while ((ch = getc (fp)) != EOF)
115 total_bytes++;
116 checksum = (checksum >> 1) + ((checksum & 1) << 15);
117 checksum += ch;
118 checksum &= 0xffff; /* Keep it within bounds. */
121 if (ferror (fp))
123 error (0, errno, "%s", file);
124 if (!is_stdin)
125 fclose (fp);
126 return false;
129 if (!is_stdin && fclose (fp) != 0)
131 error (0, errno, "%s", file);
132 return false;
135 printf ("%05d %5s", checksum,
136 human_readable (total_bytes, hbuf, human_ceiling, 1, 1024));
137 if (print_name > 1)
138 printf (" %s", file);
139 putchar ('\n');
141 return true;
144 /* Calculate and print the checksum and the size in 512-byte blocks
145 of file FILE, or of the standard input if FILE is "-".
146 If PRINT_NAME is >0, print FILE next to the checksum and size.
147 Return true if successful. */
149 static bool
150 sysv_sum_file (const char *file, int print_name)
152 int fd;
153 unsigned char buf[8192];
154 uintmax_t total_bytes = 0;
155 char hbuf[LONGEST_HUMAN_READABLE + 1];
156 int r;
157 int checksum;
159 /* The sum of all the input bytes, modulo (UINT_MAX + 1). */
160 unsigned int s = 0;
162 bool is_stdin = STREQ (file, "-");
164 if (is_stdin)
166 fd = STDIN_FILENO;
167 have_read_stdin = true;
168 if (O_BINARY && ! isatty (STDIN_FILENO))
169 xfreopen (NULL, "rb", stdin);
171 else
173 fd = open (file, O_RDONLY | O_BINARY);
174 if (fd == -1)
176 error (0, errno, "%s", file);
177 return false;
181 while (1)
183 size_t i;
184 size_t bytes_read = safe_read (fd, buf, sizeof buf);
186 if (bytes_read == 0)
187 break;
189 if (bytes_read == SAFE_READ_ERROR)
191 error (0, errno, "%s", file);
192 if (!is_stdin)
193 close (fd);
194 return false;
197 for (i = 0; i < bytes_read; i++)
198 s += buf[i];
199 total_bytes += bytes_read;
202 if (!is_stdin && close (fd) != 0)
204 error (0, errno, "%s", file);
205 return false;
208 r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
209 checksum = (r & 0xffff) + (r >> 16);
211 printf ("%d %s", checksum,
212 human_readable (total_bytes, hbuf, human_ceiling, 1, 512));
213 if (print_name)
214 printf (" %s", file);
215 putchar ('\n');
217 return true;
221 main (int argc, char **argv)
223 bool ok;
224 int optc;
225 int files_given;
226 bool (*sum_func) (const char *, int) = bsd_sum_file;
228 initialize_main (&argc, &argv);
229 set_program_name (argv[0]);
230 setlocale (LC_ALL, "");
231 bindtextdomain (PACKAGE, LOCALEDIR);
232 textdomain (PACKAGE);
234 atexit (close_stdout);
236 have_read_stdin = false;
238 while ((optc = getopt_long (argc, argv, "rs", longopts, NULL)) != -1)
240 switch (optc)
242 case 'r': /* For SysV compatibility. */
243 sum_func = bsd_sum_file;
244 break;
246 case 's':
247 sum_func = sysv_sum_file;
248 break;
250 case_GETOPT_HELP_CHAR;
252 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
254 default:
255 usage (EXIT_FAILURE);
259 files_given = argc - optind;
260 if (files_given <= 0)
261 ok = sum_func ("-", files_given);
262 else
263 for (ok = true; optind < argc; optind++)
264 ok &= sum_func (argv[optind], files_given);
266 if (have_read_stdin && fclose (stdin) == EOF)
267 error (EXIT_FAILURE, errno, "-");
268 exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);