1 /* cmp - compare two files byte by byte
19    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
26 #include <c-stack.h>
31 #include <file-type.h>
33 #include <hard-locale.h>
36 #include <unlocked-io.h>
37 #include <version-etc.h>
85 /* If nonzero, print values of bytes quoted like cat -t does. */
88 /* Values for long options that do not have single-letter equivalents.  */
96   {"print-bytes", 0, 0, 'b'},
97   {"print-chars", 0, 0, 'c'}, /* obsolescent as of diffutils 2.7.3 */
98   {"ignore-initial", 1, 0, 'i'},
115 	 _("Try `%s --help' for more information."), program_name);  in try_help()
122    *operand ARGPTR of --ignore-initial, updating *ARGPTR to point
124    *followed by DELIMITER; otherwise it must be null-terminated.  */
135     try_help ("invalid --ignore-initial value `%s'", arg);  in specify_ignore_initial()
145     try_help ("options -l and -s are incompatible", 0);  in specify_comparison_type()
159   N_("-b  --print-bytes  Print differing bytes."),
160   N_("-i SKIP  --ignore-initial=SKIP  Skip the first SKIP bytes of input."),
161   N_("-i SKIP1:SKIP2  --ignore-initial=SKIP1:SKIP2"),
163   N_("-l  --verbose  Output byte numbers and values of all differing bytes."),
164   N_("-n LIMIT  --bytes=LIMIT  Compare at most LIMIT bytes."),
165   N_("-s  --quiet  --silent  Output nothing; yield exit status only."),
166   N_("-v  --version  Output version info."),
167   N_("--help  Output this help."),
186 	  _("If a FILE is `-' or missing, read standard input."),  in usage()
188 	  _("Report bugs to <bug-gnu-utils@gnu.org>."));  in usage()
208 	 != -1)  in main()
232 	    try_help ("invalid --bytes value `%s'", optarg);  in main()
244 	   Granlund" to an o-with-umlaut (U+00F6, LATIN SMALL LETTER O  in main()
261     try_help ("missing operand after `%s'", argv[argc - 1]);  in main()
264   file[1] = optind < argc ? argv[optind++] : "-";  in main()
277       /* If file[1] is "-", treat it first; this avoids a misdiagnostic if  in main()
279       int f1 = f ^ (strcmp (file[1], "-") == 0);  in main()
287       file_desc[f1] = (strcmp (file[f1], "-") == 0  in main()
309   /* If output is redirected to the null device, we may assume `-s'.  */  in main()
323      conclude that the files differ if they have different sizes  in main()
330       off_t s0 = stat_buf[0].st_size - file_position (0);  in main()
331       off_t s1 = stat_buf[1].st_size - file_position (1);  in main()
344 			 PTRDIFF_MAX - sizeof (word));  in main()
346   /* Allocate word-aligned buffers, with space for sentinels at the end.  */  in main()
348   words_per_buffer = (buf_size + 2 * sizeof (word) - 1) / sizeof (word);  in main()
392 	    off_t file_bytes = stat_buf[f].st_size - file_position (f);  in cmp()
404       if (ig && file_position (f) == -1)  in cmp()
417 	      ig -= r;  in cmp()
431 	  remaining -= bytes_to_read;  in cmp()
468 		    /* See POSIX 1003.1-2001 for this format.  This  in cmp()
472 		      "%s %s differ: char %s, line %s\n";  in cmp()
481 		      N_("%s %s differ: byte %s, line %s\n");  in cmp()
497 		    printf (_("%s %s differ: byte %s, line %s is %3o %s %3o %s\n"),  in cmp()
517 			  /* See POSIX 1003.1-2001 for this format.  */  in cmp()
527 			  printf ("%*s %3o %-4s %3o %s\n",  in cmp()
544 	      /* See POSIX 1003.1-2001 for this format.  */  in cmp()
556 /* Compare two blocks of memory P0 and P1 until they differ,
601   return c0 - (char const *) p0;  in block_compare_and_count()
604 /* Compare two blocks of memory P0 and P1 until they differ.
629   return c0 - (char const *) p0;  in block_compare()
633    visible by quoting like cat -t does.  */
643 	  *buf++ = '-';  in sprintc()
644 	  c -= 128;  in sprintc()