1125 lines
30 KiB
C
1125 lines
30 KiB
C
/* GNU DIFF main routine.
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Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
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This file is part of GNU DIFF.
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GNU DIFF is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU DIFF is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU DIFF; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* GNU DIFF was written by Mike Haertel, David Hayes,
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Richard Stallman, Len Tower, and Paul Eggert. */
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/* $FreeBSD$ */
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#define GDIFF_MAIN
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#include "diff.h"
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#include <signal.h>
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#include "getopt.h"
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#ifdef __FreeBSD__
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#include <locale.h>
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#include <fnmatch.h>
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#else
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#include "fnmatch.h"
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#endif
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#include "prepend_args.h"
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#ifndef DEFAULT_WIDTH
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#define DEFAULT_WIDTH 130
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#endif
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#ifndef GUTTER_WIDTH_MINIMUM
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#define GUTTER_WIDTH_MINIMUM 3
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#endif
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static char const *filetype PARAMS((struct stat const *));
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static char *option_list PARAMS((char **, int));
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static int add_exclude_file PARAMS((char const *));
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static int ck_atoi PARAMS((char const *, int *));
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static int compare_files PARAMS((char const *, char const *, char const *, char const *, int));
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static int specify_format PARAMS((char **, char *));
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static void add_exclude PARAMS((char const *));
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static void add_regexp PARAMS((struct regexp_list **, char const *));
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static void specify_style PARAMS((enum output_style));
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static void try_help PARAMS((char const *));
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static void check_stdout PARAMS((void));
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static void usage PARAMS((void));
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/* Nonzero for -r: if comparing two directories,
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compare their common subdirectories recursively. */
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static int recursive;
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/* For debugging: don't do discard_confusing_lines. */
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int no_discards;
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#if HAVE_SETMODE
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/* I/O mode: nonzero only if using binary input/output. */
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static int binary_I_O;
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#endif
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/* Return a string containing the command options with which diff was invoked.
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Spaces appear between what were separate ARGV-elements.
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There is a space at the beginning but none at the end.
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If there were no options, the result is an empty string.
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Arguments: OPTIONVEC, a vector containing separate ARGV-elements, and COUNT,
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the length of that vector. */
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static char *
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option_list (optionvec, count)
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char **optionvec; /* Was `vector', but that collides on Alliant. */
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int count;
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{
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int i;
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size_t length = 0;
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char *result;
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for (i = 0; i < count; i++)
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length += strlen (optionvec[i]) + 1;
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result = xmalloc (length + 1);
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result[0] = 0;
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for (i = 0; i < count; i++)
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{
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strcat (result, " ");
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strcat (result, optionvec[i]);
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}
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return result;
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}
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/* Convert STR to a positive integer, storing the result in *OUT.
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If STR is not a valid integer, return -1 (otherwise 0). */
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static int
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ck_atoi (str, out)
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char const *str;
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int *out;
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{
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char const *p;
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for (p = str; *p; p++)
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if (*p < '0' || *p > '9')
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return -1;
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*out = atoi (optarg);
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return 0;
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}
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/* Keep track of excluded file name patterns. */
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static char const **exclude;
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static int exclude_alloc, exclude_count;
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int
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excluded_filename (f)
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char const *f;
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{
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int i;
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for (i = 0; i < exclude_count; i++)
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if (fnmatch (exclude[i], f, 0) == 0)
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return 1;
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return 0;
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}
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static void
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add_exclude (pattern)
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char const *pattern;
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{
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if (exclude_alloc <= exclude_count)
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exclude = (char const **)
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(exclude_alloc == 0
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? xmalloc ((exclude_alloc = 64) * sizeof (*exclude))
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: xrealloc (exclude, (exclude_alloc *= 2) * sizeof (*exclude)));
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exclude[exclude_count++] = pattern;
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}
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static int
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add_exclude_file (name)
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char const *name;
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{
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struct file_data f;
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char *p, *q, *lim;
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f.name = optarg;
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f.desc = (strcmp (optarg, "-") == 0
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? STDIN_FILENO
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: open (optarg, O_RDONLY, 0));
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if (f.desc < 0 || fstat (f.desc, &f.stat) != 0)
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return -1;
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sip (&f, 1);
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slurp (&f);
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for (p = f.buffer, lim = p + f.buffered_chars; p < lim; p = q)
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{
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q = (char *) memchr (p, '\n', lim - p);
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if (!q)
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q = lim;
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*q++ = 0;
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add_exclude (p);
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}
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return close (f.desc);
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}
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/* The numbers 129- that appear in the fourth element of some entries
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tell the big switch in `main' how to process those options. */
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static struct option const longopts[] =
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{
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{"ignore-blank-lines", 0, 0, 'B'},
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{"context", 2, 0, 'C'},
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{"ifdef", 1, 0, 'D'},
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{"show-function-line", 1, 0, 'F'},
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{"speed-large-files", 0, 0, 'H'},
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{"ignore-matching-lines", 1, 0, 'I'},
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{"label", 1, 0, 'L'},
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{"file-label", 1, 0, 'L'}, /* An alias, no longer recommended */
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{"new-file", 0, 0, 'N'},
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{"entire-new-file", 0, 0, 'N'}, /* An alias, no longer recommended */
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{"unidirectional-new-file", 0, 0, 'P'},
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{"starting-file", 1, 0, 'S'},
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{"initial-tab", 0, 0, 'T'},
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{"width", 1, 0, 'W'},
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{"text", 0, 0, 'a'},
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{"ascii", 0, 0, 'a'}, /* An alias, no longer recommended */
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{"ignore-space-change", 0, 0, 'b'},
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{"minimal", 0, 0, 'd'},
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{"ed", 0, 0, 'e'},
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{"forward-ed", 0, 0, 'f'},
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{"ignore-case", 0, 0, 'i'},
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{"paginate", 0, 0, 'l'},
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{"print", 0, 0, 'l'}, /* An alias, no longer recommended */
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{"rcs", 0, 0, 'n'},
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{"show-c-function", 0, 0, 'p'},
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{"brief", 0, 0, 'q'},
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{"recursive", 0, 0, 'r'},
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{"report-identical-files", 0, 0, 's'},
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{"expand-tabs", 0, 0, 't'},
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{"version", 0, 0, 'v'},
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{"ignore-all-space", 0, 0, 'w'},
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{"exclude", 1, 0, 'x'},
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{"exclude-from", 1, 0, 'X'},
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{"side-by-side", 0, 0, 'y'},
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{"unified", 2, 0, 'U'},
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{"left-column", 0, 0, 129},
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{"suppress-common-lines", 0, 0, 130},
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{"sdiff-merge-assist", 0, 0, 131},
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{"old-line-format", 1, 0, 132},
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{"new-line-format", 1, 0, 133},
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{"unchanged-line-format", 1, 0, 134},
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{"line-format", 1, 0, 135},
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{"old-group-format", 1, 0, 136},
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{"new-group-format", 1, 0, 137},
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{"unchanged-group-format", 1, 0, 138},
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{"changed-group-format", 1, 0, 139},
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{"horizon-lines", 1, 0, 140},
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{"help", 0, 0, 141},
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{"binary", 0, 0, 142},
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{0, 0, 0, 0}
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};
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int
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main (argc, argv)
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int argc;
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char *argv[];
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{
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int val;
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int c;
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int prev = -1;
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int width = DEFAULT_WIDTH;
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int show_c_function = 0;
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#ifdef __FreeBSD__
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setlocale(LC_ALL, "");
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#endif
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/* Do our initializations. */
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initialize_main (&argc, &argv);
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program_name = argv[0];
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output_style = OUTPUT_NORMAL;
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context = -1;
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prepend_default_options (getenv ("DIFF_OPTIONS"), &argc, &argv);
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/* Decode the options. */
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while ((c = getopt_long (argc, argv,
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"0123456789abBcC:dD:efF:hHiI:lL:nNopPqrsS:tTuU:vwW:x:X:y",
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longopts, 0)) != EOF)
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{
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switch (c)
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{
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/* All digits combine in decimal to specify the context-size. */
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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case '0':
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if (context == -1)
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context = 0;
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/* If a context length has already been specified,
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more digits allowed only if they follow right after the others.
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Reject two separate runs of digits, or digits after -C. */
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else if (prev < '0' || prev > '9')
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fatal ("context length specified twice");
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context = context * 10 + c - '0';
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break;
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case 'a':
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/* Treat all files as text files; never treat as binary. */
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always_text_flag = 1;
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break;
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case 'b':
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/* Ignore changes in amount of white space. */
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ignore_space_change_flag = 1;
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ignore_some_changes = 1;
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ignore_some_line_changes = 1;
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break;
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case 'B':
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/* Ignore changes affecting only blank lines. */
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ignore_blank_lines_flag = 1;
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ignore_some_changes = 1;
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break;
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case 'C': /* +context[=lines] */
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case 'U': /* +unified[=lines] */
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if (optarg)
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{
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if (context >= 0)
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fatal ("context length specified twice");
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if (ck_atoi (optarg, &context))
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fatal ("invalid context length argument");
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}
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/* Falls through. */
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case 'c':
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/* Make context-style output. */
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specify_style (c == 'U' ? OUTPUT_UNIFIED : OUTPUT_CONTEXT);
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break;
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case 'd':
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/* Don't discard lines. This makes things slower (sometimes much
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slower) but will find a guaranteed minimal set of changes. */
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no_discards = 1;
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break;
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case 'D':
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/* Make merged #ifdef output. */
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specify_style (OUTPUT_IFDEF);
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{
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int i, err = 0;
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static char const C_ifdef_group_formats[] =
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"#ifndef %s\n%%<#endif /* not %s */\n%c#ifdef %s\n%%>#endif /* %s */\n%c%%=%c#ifndef %s\n%%<#else /* %s */\n%%>#endif /* %s */\n";
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char *b = xmalloc (sizeof (C_ifdef_group_formats)
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+ 7 * strlen(optarg) - 14 /* 7*"%s" */
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- 8 /* 5*"%%" + 3*"%c" */);
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sprintf (b, C_ifdef_group_formats,
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optarg, optarg, 0,
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optarg, optarg, 0, 0,
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optarg, optarg, optarg);
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for (i = 0; i < 4; i++)
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{
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err |= specify_format (&group_format[i], b);
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b += strlen (b) + 1;
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}
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if (err)
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error ("conflicting #ifdef formats", 0, 0);
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}
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break;
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case 'e':
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/* Make output that is a valid `ed' script. */
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specify_style (OUTPUT_ED);
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break;
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case 'f':
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/* Make output that looks vaguely like an `ed' script
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but has changes in the order they appear in the file. */
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specify_style (OUTPUT_FORWARD_ED);
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break;
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case 'F':
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/* Show, for each set of changes, the previous line that
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matches the specified regexp. Currently affects only
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context-style output. */
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add_regexp (&function_regexp_list, optarg);
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break;
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case 'h':
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/* Split the files into chunks of around 1500 lines
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for faster processing. Usually does not change the result.
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This currently has no effect. */
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break;
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case 'H':
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/* Turn on heuristics that speed processing of large files
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with a small density of changes. */
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heuristic = 1;
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break;
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||
case 'i':
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/* Ignore changes in case. */
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ignore_case_flag = 1;
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ignore_some_changes = 1;
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ignore_some_line_changes = 1;
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break;
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|
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case 'I':
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/* Ignore changes affecting only lines that match the
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specified regexp. */
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add_regexp (&ignore_regexp_list, optarg);
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ignore_some_changes = 1;
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break;
|
||
|
||
case 'l':
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/* Pass the output through `pr' to paginate it. */
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paginate_flag = 1;
|
||
#if !defined(SIGCHLD) && defined(SIGCLD)
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#define SIGCHLD SIGCLD
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||
#endif
|
||
#ifdef SIGCHLD
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/* Pagination requires forking and waiting, and
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System V fork+wait does not work if SIGCHLD is ignored. */
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signal (SIGCHLD, SIG_DFL);
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#endif
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||
break;
|
||
|
||
case 'L':
|
||
/* Specify file labels for `-c' output headers. */
|
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if (!file_label[0])
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file_label[0] = optarg;
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else if (!file_label[1])
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file_label[1] = optarg;
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||
else
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fatal ("too many file label options");
|
||
break;
|
||
|
||
case 'n':
|
||
/* Output RCS-style diffs, like `-f' except that each command
|
||
specifies the number of lines affected. */
|
||
specify_style (OUTPUT_RCS);
|
||
break;
|
||
|
||
case 'N':
|
||
/* When comparing directories, if a file appears only in one
|
||
directory, treat it as present but empty in the other. */
|
||
entire_new_file_flag = 1;
|
||
break;
|
||
|
||
case 'o':
|
||
/* Output in the old tradition style. */
|
||
specify_style (OUTPUT_NORMAL);
|
||
break;
|
||
|
||
case 'p':
|
||
/* Make context-style output and show name of last C function. */
|
||
show_c_function = 1;
|
||
add_regexp (&function_regexp_list, "^[_a-zA-Z$]");
|
||
break;
|
||
|
||
case 'P':
|
||
/* When comparing directories, if a file appears only in
|
||
the second directory of the two,
|
||
treat it as present but empty in the other. */
|
||
unidirectional_new_file_flag = 1;
|
||
break;
|
||
|
||
case 'q':
|
||
no_details_flag = 1;
|
||
break;
|
||
|
||
case 'r':
|
||
/* When comparing directories,
|
||
recursively compare any subdirectories found. */
|
||
recursive = 1;
|
||
break;
|
||
|
||
case 's':
|
||
/* Print a message if the files are the same. */
|
||
print_file_same_flag = 1;
|
||
break;
|
||
|
||
case 'S':
|
||
/* When comparing directories, start with the specified
|
||
file name. This is used for resuming an aborted comparison. */
|
||
dir_start_file = optarg;
|
||
break;
|
||
|
||
case 't':
|
||
/* Expand tabs to spaces in the output so that it preserves
|
||
the alignment of the input files. */
|
||
tab_expand_flag = 1;
|
||
break;
|
||
|
||
case 'T':
|
||
/* Use a tab in the output, rather than a space, before the
|
||
text of an input line, so as to keep the proper alignment
|
||
in the input line without changing the characters in it. */
|
||
tab_align_flag = 1;
|
||
break;
|
||
|
||
case 'u':
|
||
/* Output the context diff in unidiff format. */
|
||
specify_style (OUTPUT_UNIFIED);
|
||
break;
|
||
|
||
case 'v':
|
||
printf ("diff - GNU diffutils version %s\n", version_string);
|
||
exit (0);
|
||
|
||
case 'w':
|
||
/* Ignore horizontal white space when comparing lines. */
|
||
ignore_all_space_flag = 1;
|
||
ignore_some_changes = 1;
|
||
ignore_some_line_changes = 1;
|
||
break;
|
||
|
||
case 'x':
|
||
add_exclude (optarg);
|
||
break;
|
||
|
||
case 'X':
|
||
if (add_exclude_file (optarg) != 0)
|
||
pfatal_with_name (optarg);
|
||
break;
|
||
|
||
case 'y':
|
||
/* Use side-by-side (sdiff-style) columnar output. */
|
||
specify_style (OUTPUT_SDIFF);
|
||
break;
|
||
|
||
case 'W':
|
||
/* Set the line width for OUTPUT_SDIFF. */
|
||
if (ck_atoi (optarg, &width) || width <= 0)
|
||
fatal ("column width must be a positive integer");
|
||
break;
|
||
|
||
case 129:
|
||
sdiff_left_only = 1;
|
||
break;
|
||
|
||
case 130:
|
||
sdiff_skip_common_lines = 1;
|
||
break;
|
||
|
||
case 131:
|
||
/* sdiff-style columns output. */
|
||
specify_style (OUTPUT_SDIFF);
|
||
sdiff_help_sdiff = 1;
|
||
break;
|
||
|
||
case 132:
|
||
case 133:
|
||
case 134:
|
||
specify_style (OUTPUT_IFDEF);
|
||
if (specify_format (&line_format[c - 132], optarg) != 0)
|
||
error ("conflicting line format", 0, 0);
|
||
break;
|
||
|
||
case 135:
|
||
specify_style (OUTPUT_IFDEF);
|
||
{
|
||
int i, err = 0;
|
||
for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
|
||
err |= specify_format (&line_format[i], optarg);
|
||
if (err)
|
||
error ("conflicting line format", 0, 0);
|
||
}
|
||
break;
|
||
|
||
case 136:
|
||
case 137:
|
||
case 138:
|
||
case 139:
|
||
specify_style (OUTPUT_IFDEF);
|
||
if (specify_format (&group_format[c - 136], optarg) != 0)
|
||
error ("conflicting group format", 0, 0);
|
||
break;
|
||
|
||
case 140:
|
||
if (ck_atoi (optarg, &horizon_lines) || horizon_lines < 0)
|
||
fatal ("horizon must be a nonnegative integer");
|
||
break;
|
||
|
||
case 141:
|
||
usage ();
|
||
check_stdout ();
|
||
exit (0);
|
||
|
||
case 142:
|
||
/* Use binary I/O when reading and writing data.
|
||
On Posix hosts, this has no effect. */
|
||
#if HAVE_SETMODE
|
||
binary_I_O = 1;
|
||
setmode (STDOUT_FILENO, O_BINARY);
|
||
#endif
|
||
break;
|
||
|
||
default:
|
||
try_help (0);
|
||
}
|
||
prev = c;
|
||
}
|
||
|
||
if (argc - optind != 2)
|
||
try_help (argc - optind < 2 ? "missing operand" : "extra operand");
|
||
|
||
|
||
{
|
||
/*
|
||
* We maximize first the half line width, and then the gutter width,
|
||
* according to the following constraints:
|
||
* 1. Two half lines plus a gutter must fit in a line.
|
||
* 2. If the half line width is nonzero:
|
||
* a. The gutter width is at least GUTTER_WIDTH_MINIMUM.
|
||
* b. If tabs are not expanded to spaces,
|
||
* a half line plus a gutter is an integral number of tabs,
|
||
* so that tabs in the right column line up.
|
||
*/
|
||
int t = tab_expand_flag ? 1 : TAB_WIDTH;
|
||
int off = (width + t + GUTTER_WIDTH_MINIMUM) / (2*t) * t;
|
||
sdiff_half_width = max (0, min (off - GUTTER_WIDTH_MINIMUM, width - off)),
|
||
sdiff_column2_offset = sdiff_half_width ? off : width;
|
||
}
|
||
|
||
if (show_c_function && output_style != OUTPUT_UNIFIED)
|
||
specify_style (OUTPUT_CONTEXT);
|
||
|
||
if (output_style != OUTPUT_CONTEXT && output_style != OUTPUT_UNIFIED)
|
||
context = 0;
|
||
else if (context == -1)
|
||
/* Default amount of context for -c. */
|
||
context = 3;
|
||
|
||
if (output_style == OUTPUT_IFDEF)
|
||
{
|
||
/* Format arrays are char *, not char const *,
|
||
because integer formats are temporarily modified.
|
||
But it is safe to assign a constant like "%=" to a format array,
|
||
since "%=" does not format any integers. */
|
||
int i;
|
||
for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
|
||
if (!line_format[i])
|
||
line_format[i] = "%l\n";
|
||
if (!group_format[OLD])
|
||
group_format[OLD]
|
||
= group_format[UNCHANGED] ? group_format[UNCHANGED] : "%<";
|
||
if (!group_format[NEW])
|
||
group_format[NEW]
|
||
= group_format[UNCHANGED] ? group_format[UNCHANGED] : "%>";
|
||
if (!group_format[UNCHANGED])
|
||
group_format[UNCHANGED] = "%=";
|
||
if (!group_format[CHANGED])
|
||
group_format[CHANGED] = concat (group_format[OLD],
|
||
group_format[NEW], "");
|
||
}
|
||
|
||
no_diff_means_no_output =
|
||
(output_style == OUTPUT_IFDEF ?
|
||
(!*group_format[UNCHANGED]
|
||
|| (strcmp (group_format[UNCHANGED], "%=") == 0
|
||
&& !*line_format[UNCHANGED]))
|
||
: output_style == OUTPUT_SDIFF ? sdiff_skip_common_lines : 1);
|
||
|
||
switch_string = option_list (argv + 1, optind - 1);
|
||
|
||
val = compare_files (0, argv[optind], 0, argv[optind + 1], 0);
|
||
|
||
/* Print any messages that were saved up for last. */
|
||
print_message_queue ();
|
||
|
||
check_stdout ();
|
||
exit (val);
|
||
return val;
|
||
}
|
||
|
||
/* Add the compiled form of regexp PATTERN to REGLIST. */
|
||
|
||
static void
|
||
add_regexp (reglist, pattern)
|
||
struct regexp_list **reglist;
|
||
char const *pattern;
|
||
{
|
||
struct regexp_list *r;
|
||
char const *m;
|
||
|
||
r = (struct regexp_list *) xmalloc (sizeof (*r));
|
||
bzero (r, sizeof (*r));
|
||
r->buf.fastmap = xmalloc (256);
|
||
m = re_compile_pattern (pattern, strlen (pattern), &r->buf);
|
||
if (m != 0)
|
||
error ("%s: %s", pattern, m);
|
||
|
||
/* Add to the start of the list, since it's easier than the end. */
|
||
r->next = *reglist;
|
||
*reglist = r;
|
||
}
|
||
|
||
static void
|
||
try_help (reason)
|
||
char const *reason;
|
||
{
|
||
if (reason)
|
||
error ("%s", reason, 0);
|
||
error ("Try `%s --help' for more information.", program_name, 0);
|
||
exit (2);
|
||
}
|
||
|
||
static void
|
||
check_stdout ()
|
||
{
|
||
if (ferror (stdout) || fclose (stdout) != 0)
|
||
fatal ("write error");
|
||
}
|
||
|
||
static char const * const option_help[] = {
|
||
"-i --ignore-case Consider upper- and lower-case to be the same.",
|
||
"-w --ignore-all-space Ignore all white space.",
|
||
"-b --ignore-space-change Ignore changes in the amount of white space.",
|
||
"-B --ignore-blank-lines Ignore changes whose lines are all blank.",
|
||
"-I RE --ignore-matching-lines=RE Ignore changes whose lines all match RE.",
|
||
#if HAVE_SETMODE
|
||
"--binary Read and write data in binary mode.",
|
||
#endif
|
||
"-a --text Treat all files as text.\n",
|
||
"-c -C NUM --context[=NUM] Output NUM (default 2) lines of copied context.",
|
||
"-u -U NUM --unified[=NUM] Output NUM (default 2) lines of unified context.",
|
||
" -NUM Use NUM context lines.",
|
||
" -L LABEL --label LABEL Use LABEL instead of file name.",
|
||
" -p --show-c-function Show which C function each change is in.",
|
||
" -F RE --show-function-line=RE Show the most recent line matching RE.",
|
||
"-q --brief Output only whether files differ.",
|
||
"-e --ed Output an ed script.",
|
||
"-n --rcs Output an RCS format diff.",
|
||
"-y --side-by-side Output in two columns.",
|
||
" -W NUM --width=NUM Output at most NUM (default 130) characters per line.",
|
||
" --left-column Output only the left column of common lines.",
|
||
" --suppress-common-lines Do not output common lines.",
|
||
"-DNAME --ifdef=NAME Output merged file to show `#ifdef NAME' diffs.",
|
||
"--GTYPE-group-format=GFMT Similar, but format GTYPE input groups with GFMT.",
|
||
"--line-format=LFMT Similar, but format all input lines with LFMT.",
|
||
"--LTYPE-line-format=LFMT Similar, but format LTYPE input lines with LFMT.",
|
||
" LTYPE is `old', `new', or `unchanged'. GTYPE is LTYPE or `changed'.",
|
||
" GFMT may contain:",
|
||
" %< lines from FILE1",
|
||
" %> lines from FILE2",
|
||
" %= lines common to FILE1 and FILE2",
|
||
" %[-][WIDTH][.[PREC]]{doxX}LETTER printf-style spec for LETTER",
|
||
" LETTERs are as follows for new group, lower case for old group:",
|
||
" F first line number",
|
||
" L last line number",
|
||
" N number of lines = L-F+1",
|
||
" E F-1",
|
||
" M L+1",
|
||
" LFMT may contain:",
|
||
" %L contents of line",
|
||
" %l contents of line, excluding any trailing newline",
|
||
" %[-][WIDTH][.[PREC]]{doxX}n printf-style spec for input line number",
|
||
" Either GFMT or LFMT may contain:",
|
||
" %% %",
|
||
" %c'C' the single character C",
|
||
" %c'\\OOO' the character with octal code OOO\n",
|
||
"-l --paginate Pass the output through `pr' to paginate it.",
|
||
"-t --expand-tabs Expand tabs to spaces in output.",
|
||
"-T --initial-tab Make tabs line up by prepending a tab.\n",
|
||
"-r --recursive Recursively compare any subdirectories found.",
|
||
"-N --new-file Treat absent files as empty.",
|
||
"-P --unidirectional-new-file Treat absent first files as empty.",
|
||
"-s --report-identical-files Report when two files are the same.",
|
||
"-x PAT --exclude=PAT Exclude files that match PAT.",
|
||
"-X FILE --exclude-from=FILE Exclude files that match any pattern in FILE.",
|
||
"-S FILE --starting-file=FILE Start with FILE when comparing directories.\n",
|
||
"--horizon-lines=NUM Keep NUM lines of the common prefix and suffix.",
|
||
"-d --minimal Try hard to find a smaller set of changes.",
|
||
"-H --speed-large-files Assume large files and many scattered small changes.\n",
|
||
"-v --version Output version info.",
|
||
"--help Output this help.",
|
||
0
|
||
};
|
||
|
||
static void
|
||
usage ()
|
||
{
|
||
char const * const *p;
|
||
|
||
printf ("Usage: %s [OPTION]... FILE1 FILE2\n\n", program_name);
|
||
for (p = option_help; *p; p++)
|
||
printf (" %s\n", *p);
|
||
printf ("\nIf FILE1 or FILE2 is `-', read standard input.\n");
|
||
}
|
||
|
||
static int
|
||
specify_format (var, value)
|
||
char **var;
|
||
char *value;
|
||
{
|
||
int err = *var ? strcmp (*var, value) : 0;
|
||
*var = value;
|
||
return err;
|
||
}
|
||
|
||
static void
|
||
specify_style (style)
|
||
enum output_style style;
|
||
{
|
||
if (output_style != OUTPUT_NORMAL
|
||
&& output_style != style)
|
||
error ("conflicting specifications of output style", 0, 0);
|
||
output_style = style;
|
||
}
|
||
|
||
static char const *
|
||
filetype (st)
|
||
struct stat const *st;
|
||
{
|
||
/* See Posix.2 section 4.17.6.1.1 and Table 5-1 for these formats.
|
||
To keep diagnostics grammatical, the returned string must start
|
||
with a consonant. */
|
||
|
||
if (S_ISREG (st->st_mode))
|
||
{
|
||
if (st->st_size == 0)
|
||
return "regular empty file";
|
||
/* Posix.2 section 5.14.2 seems to suggest that we must read the file
|
||
and guess whether it's C, Fortran, etc., but this is somewhat useless
|
||
and doesn't reflect historical practice. We're allowed to guess
|
||
wrong, so we don't bother to read the file. */
|
||
return "regular file";
|
||
}
|
||
if (S_ISDIR (st->st_mode)) return "directory";
|
||
|
||
/* other Posix.1 file types */
|
||
#ifdef S_ISBLK
|
||
if (S_ISBLK (st->st_mode)) return "block special file";
|
||
#endif
|
||
#ifdef S_ISCHR
|
||
if (S_ISCHR (st->st_mode)) return "character special file";
|
||
#endif
|
||
#ifdef S_ISFIFO
|
||
if (S_ISFIFO (st->st_mode)) return "fifo";
|
||
#endif
|
||
|
||
/* other Posix.1b file types */
|
||
#ifdef S_TYPEISMQ
|
||
if (S_TYPEISMQ (st)) return "message queue";
|
||
#endif
|
||
#ifdef S_TYPEISSEM
|
||
if (S_TYPEISSEM (st)) return "semaphore";
|
||
#endif
|
||
#ifdef S_TYPEISSHM
|
||
if (S_TYPEISSHM (st)) return "shared memory object";
|
||
#endif
|
||
|
||
/* other popular file types */
|
||
/* S_ISLNK is impossible with `fstat' and `stat'. */
|
||
#ifdef S_ISSOCK
|
||
if (S_ISSOCK (st->st_mode)) return "socket";
|
||
#endif
|
||
|
||
return "weird file";
|
||
}
|
||
|
||
/* Compare two files (or dirs) with specified names
|
||
DIR0/NAME0 and DIR1/NAME1, at level DEPTH in directory recursion.
|
||
(if DIR0 is 0, then the name is just NAME0, etc.)
|
||
This is self-contained; it opens the files and closes them.
|
||
|
||
Value is 0 if files are the same, 1 if different,
|
||
2 if there is a problem opening them. */
|
||
|
||
static int
|
||
compare_files (dir0, name0, dir1, name1, depth)
|
||
char const *dir0, *dir1;
|
||
char const *name0, *name1;
|
||
int depth;
|
||
{
|
||
struct file_data inf[2];
|
||
register int i;
|
||
int val;
|
||
int same_files;
|
||
int failed = 0;
|
||
char *free0 = 0, *free1 = 0;
|
||
|
||
/* If this is directory comparison, perhaps we have a file
|
||
that exists only in one of the directories.
|
||
If so, just print a message to that effect. */
|
||
|
||
if (! ((name0 != 0 && name1 != 0)
|
||
|| (unidirectional_new_file_flag && name1 != 0)
|
||
|| entire_new_file_flag))
|
||
{
|
||
char const *name = name0 == 0 ? name1 : name0;
|
||
char const *dir = name0 == 0 ? dir1 : dir0;
|
||
message ("Only in %s: %s\n", dir, name);
|
||
/* Return 1 so that diff_dirs will return 1 ("some files differ"). */
|
||
return 1;
|
||
}
|
||
|
||
bzero (inf, sizeof (inf));
|
||
|
||
/* Mark any nonexistent file with -1 in the desc field. */
|
||
/* Mark unopened files (e.g. directories) with -2. */
|
||
|
||
inf[0].desc = name0 == 0 ? -1 : -2;
|
||
inf[1].desc = name1 == 0 ? -1 : -2;
|
||
|
||
/* Now record the full name of each file, including nonexistent ones. */
|
||
|
||
if (name0 == 0)
|
||
name0 = name1;
|
||
if (name1 == 0)
|
||
name1 = name0;
|
||
|
||
inf[0].name = dir0 == 0 ? name0 : (free0 = dir_file_pathname (dir0, name0));
|
||
inf[1].name = dir1 == 0 ? name1 : (free1 = dir_file_pathname (dir1, name1));
|
||
|
||
/* Stat the files. Record whether they are directories. */
|
||
|
||
for (i = 0; i <= 1; i++)
|
||
{
|
||
if (inf[i].desc != -1)
|
||
{
|
||
int stat_result;
|
||
|
||
if (i && filename_cmp (inf[i].name, inf[0].name) == 0)
|
||
{
|
||
inf[i].stat = inf[0].stat;
|
||
stat_result = 0;
|
||
}
|
||
else if (strcmp (inf[i].name, "-") == 0)
|
||
{
|
||
inf[i].desc = STDIN_FILENO;
|
||
stat_result = fstat (STDIN_FILENO, &inf[i].stat);
|
||
if (stat_result == 0 && S_ISREG (inf[i].stat.st_mode))
|
||
{
|
||
off_t pos = lseek (STDIN_FILENO, (off_t) 0, SEEK_CUR);
|
||
if (pos == -1)
|
||
stat_result = -1;
|
||
else
|
||
{
|
||
if (pos <= inf[i].stat.st_size)
|
||
inf[i].stat.st_size -= pos;
|
||
else
|
||
inf[i].stat.st_size = 0;
|
||
/* Posix.2 4.17.6.1.4 requires current time for stdin. */
|
||
time (&inf[i].stat.st_mtime);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
stat_result = stat (inf[i].name, &inf[i].stat);
|
||
|
||
if (stat_result != 0)
|
||
{
|
||
perror_with_name (inf[i].name);
|
||
failed = 1;
|
||
}
|
||
else
|
||
{
|
||
inf[i].dir_p = S_ISDIR (inf[i].stat.st_mode) && inf[i].desc != 0;
|
||
if (inf[1 - i].desc == -1)
|
||
{
|
||
inf[1 - i].dir_p = inf[i].dir_p;
|
||
inf[1 - i].stat.st_mode = inf[i].stat.st_mode;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (! failed && depth == 0 && inf[0].dir_p != inf[1].dir_p)
|
||
{
|
||
/* If one is a directory, and it was specified in the command line,
|
||
use the file in that dir with the other file's basename. */
|
||
|
||
int fnm_arg = inf[0].dir_p;
|
||
int dir_arg = 1 - fnm_arg;
|
||
char const *fnm = inf[fnm_arg].name;
|
||
char const *dir = inf[dir_arg].name;
|
||
char const *p = filename_lastdirchar (fnm);
|
||
char const *filename = inf[dir_arg].name
|
||
= dir_file_pathname (dir, p ? p + 1 : fnm);
|
||
|
||
if (strcmp (fnm, "-") == 0)
|
||
fatal ("can't compare - to a directory");
|
||
|
||
if (stat (filename, &inf[dir_arg].stat) != 0)
|
||
{
|
||
perror_with_name (filename);
|
||
failed = 1;
|
||
}
|
||
else
|
||
inf[dir_arg].dir_p = S_ISDIR (inf[dir_arg].stat.st_mode);
|
||
}
|
||
|
||
if (failed)
|
||
{
|
||
|
||
/* If either file should exist but does not, return 2. */
|
||
|
||
val = 2;
|
||
|
||
}
|
||
else if ((same_files = inf[0].desc != -1 && inf[1].desc != -1
|
||
&& 0 < same_file (&inf[0].stat, &inf[1].stat))
|
||
&& no_diff_means_no_output)
|
||
{
|
||
/* The two named files are actually the same physical file.
|
||
We know they are identical without actually reading them. */
|
||
|
||
val = 0;
|
||
}
|
||
else if (inf[0].dir_p & inf[1].dir_p)
|
||
{
|
||
if (output_style == OUTPUT_IFDEF)
|
||
fatal ("-D option not supported with directories");
|
||
|
||
/* If both are directories, compare the files in them. */
|
||
|
||
if (depth > 0 && !recursive)
|
||
{
|
||
/* But don't compare dir contents one level down
|
||
unless -r was specified. */
|
||
message ("Common subdirectories: %s and %s\n",
|
||
inf[0].name, inf[1].name);
|
||
val = 0;
|
||
}
|
||
else
|
||
{
|
||
val = diff_dirs (inf, compare_files, depth);
|
||
}
|
||
|
||
}
|
||
else if ((inf[0].dir_p | inf[1].dir_p)
|
||
|| (depth > 0
|
||
&& (! S_ISREG (inf[0].stat.st_mode)
|
||
|| ! S_ISREG (inf[1].stat.st_mode))))
|
||
{
|
||
/* Perhaps we have a subdirectory that exists only in one directory.
|
||
If so, just print a message to that effect. */
|
||
|
||
if (inf[0].desc == -1 || inf[1].desc == -1)
|
||
{
|
||
if ((inf[0].dir_p | inf[1].dir_p)
|
||
&& recursive
|
||
&& (entire_new_file_flag
|
||
|| (unidirectional_new_file_flag && inf[0].desc == -1)))
|
||
val = diff_dirs (inf, compare_files, depth);
|
||
else
|
||
{
|
||
char const *dir = (inf[0].desc == -1) ? dir1 : dir0;
|
||
/* See Posix.2 section 4.17.6.1.1 for this format. */
|
||
message ("Only in %s: %s\n", dir, name0);
|
||
val = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We have two files that are not to be compared. */
|
||
|
||
/* See Posix.2 section 4.17.6.1.1 for this format. */
|
||
message5 ("File %s is a %s while file %s is a %s\n",
|
||
inf[0].name, filetype (&inf[0].stat),
|
||
inf[1].name, filetype (&inf[1].stat));
|
||
|
||
/* This is a difference. */
|
||
val = 1;
|
||
}
|
||
}
|
||
else if ((no_details_flag & ~ignore_some_changes)
|
||
&& inf[0].stat.st_size != inf[1].stat.st_size
|
||
&& (inf[0].desc == -1 || S_ISREG (inf[0].stat.st_mode))
|
||
&& (inf[1].desc == -1 || S_ISREG (inf[1].stat.st_mode)))
|
||
{
|
||
message ("Files %s and %s differ\n", inf[0].name, inf[1].name);
|
||
val = 1;
|
||
}
|
||
else
|
||
{
|
||
/* Both exist and neither is a directory. */
|
||
|
||
/* Open the files and record their descriptors. */
|
||
|
||
if (inf[0].desc == -2)
|
||
if ((inf[0].desc = open (inf[0].name, O_RDONLY, 0)) < 0)
|
||
{
|
||
perror_with_name (inf[0].name);
|
||
failed = 1;
|
||
}
|
||
if (inf[1].desc == -2)
|
||
if (same_files)
|
||
inf[1].desc = inf[0].desc;
|
||
else if ((inf[1].desc = open (inf[1].name, O_RDONLY, 0)) < 0)
|
||
{
|
||
perror_with_name (inf[1].name);
|
||
failed = 1;
|
||
}
|
||
|
||
#if HAVE_SETMODE
|
||
if (binary_I_O)
|
||
for (i = 0; i <= 1; i++)
|
||
if (0 <= inf[i].desc)
|
||
setmode (inf[i].desc, O_BINARY);
|
||
#endif
|
||
|
||
/* Compare the files, if no error was found. */
|
||
|
||
val = failed ? 2 : diff_2_files (inf, depth);
|
||
|
||
/* Close the file descriptors. */
|
||
|
||
if (inf[0].desc >= 0 && close (inf[0].desc) != 0)
|
||
{
|
||
perror_with_name (inf[0].name);
|
||
val = 2;
|
||
}
|
||
if (inf[1].desc >= 0 && inf[0].desc != inf[1].desc
|
||
&& close (inf[1].desc) != 0)
|
||
{
|
||
perror_with_name (inf[1].name);
|
||
val = 2;
|
||
}
|
||
}
|
||
|
||
/* Now the comparison has been done, if no error prevented it,
|
||
and VAL is the value this function will return. */
|
||
|
||
if (val == 0 && !inf[0].dir_p)
|
||
{
|
||
if (print_file_same_flag)
|
||
message ("Files %s and %s are identical\n",
|
||
inf[0].name, inf[1].name);
|
||
}
|
||
else
|
||
fflush (stdout);
|
||
|
||
if (free0)
|
||
free (free0);
|
||
if (free1)
|
||
free (free1);
|
||
|
||
return val;
|
||
}
|