932 lines
24 KiB
C
932 lines
24 KiB
C
/* GNU DIFF main routine.
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Copyright (C) 1988, 1989, 1992 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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#ifndef lint
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static char rcsid[] = "$Id: diff.c,v 1.3 1993/08/02 17:26:08 mycroft Exp $";
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#endif /* not lint */
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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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#define GDIFF_MAIN
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#include "diff.h"
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#include "getopt.h"
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#include "fnmatch.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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int diff_dirs ();
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int diff_2_files ();
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static int compare_files ();
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static int specify_format ();
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static void add_regexp();
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static void specify_style ();
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static void usage ();
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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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/* 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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int 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 = (char *) 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 *str;
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int *out;
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{
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char *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 const char **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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const char *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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const char *pattern;
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{
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if (exclude_alloc <= exclude_count)
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exclude = (const char **)
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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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const char *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 ? 0 : 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 = 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 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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{"binary", 0, 0, 'q'}, /* An alias, no longer recommended */
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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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{"old-group-format", 1, 0, 135},
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{"new-group-format", 1, 0, 136},
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{"unchanged-group-format", 1, 0, 137},
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{"changed-group-format", 1, 0, 138},
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{"horizon-lines", 1, 0, 139},
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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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extern char *version_string;
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int width = DEFAULT_WIDTH;
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program = argv[0];
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/* Do our initializations. */
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output_style = OUTPUT_NORMAL;
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always_text_flag = FALSE;
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ignore_space_change_flag = FALSE;
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ignore_all_space_flag = FALSE;
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length_varies = FALSE;
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ignore_case_flag = FALSE;
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ignore_blank_lines_flag = FALSE;
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ignore_regexp_list = NULL;
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function_regexp_list = NULL;
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print_file_same_flag = FALSE;
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entire_new_file_flag = FALSE;
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unidirectional_new_file_flag = FALSE;
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no_details_flag = FALSE;
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context = -1;
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line_end_char = '\n';
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tab_align_flag = FALSE;
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tab_expand_flag = FALSE;
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recursive = FALSE;
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paginate_flag = FALSE;
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heuristic = FALSE;
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dir_start_file = NULL;
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msg_chain = NULL;
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msg_chain_end = NULL;
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no_discards = 0;
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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:nNpPqrsS:tTuU:vwW:x:X:y",
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longopts, (int *)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 whitespace. */
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ignore_space_change_flag = 1;
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length_varies = 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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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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||
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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 const char 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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||
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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;
|
||
|
||
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;
|
||
|
||
case 'h':
|
||
/* 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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||
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||
This currently has no effect. */
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||
break;
|
||
|
||
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;
|
||
|
||
case 'i':
|
||
/* Ignore changes in case. */
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||
ignore_case_flag = 1;
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||
break;
|
||
|
||
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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||
break;
|
||
|
||
case 'l':
|
||
/* Pass the output through `pr' to paginate it. */
|
||
paginate_flag = 1;
|
||
break;
|
||
|
||
case 'L':
|
||
/* Specify file labels for `-c' output headers. */
|
||
if (!file_label[0])
|
||
file_label[0] = optarg;
|
||
else if (!file_label[1])
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||
file_label[1] = optarg;
|
||
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. */
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||
entire_new_file_flag = 1;
|
||
break;
|
||
|
||
case 'p':
|
||
/* Make context-style output and show name of last C function. */
|
||
specify_style (OUTPUT_CONTEXT);
|
||
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':
|
||
fprintf (stderr, "GNU diff version %s\n", version_string);
|
||
break;
|
||
|
||
case 'w':
|
||
/* Ignore horizontal whitespace when comparing lines. */
|
||
ignore_all_space_flag = 1;
|
||
length_varies = 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);
|
||
{
|
||
const char **form = &line_format[c - 132];
|
||
if (*form && strcmp (*form, optarg) != 0)
|
||
error ("conflicting line format", 0, 0);
|
||
*form = optarg;
|
||
}
|
||
break;
|
||
|
||
case 135:
|
||
case 136:
|
||
case 137:
|
||
case 138:
|
||
specify_style (OUTPUT_IFDEF);
|
||
{
|
||
const char **form = &group_format[c - 135];
|
||
if (*form && strcmp (*form, optarg) != 0)
|
||
error ("conflicting group format", 0, 0);
|
||
*form = optarg;
|
||
}
|
||
break;
|
||
|
||
case 139:
|
||
if (ck_atoi (optarg, &horizon_lines) || horizon_lines < 0)
|
||
fatal ("horizon must be a nonnegative integer");
|
||
break;
|
||
|
||
default:
|
||
usage ();
|
||
}
|
||
prev = c;
|
||
}
|
||
|
||
if (optind != argc - 2)
|
||
usage ();
|
||
|
||
|
||
{
|
||
/*
|
||
* 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 (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)
|
||
{
|
||
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 (NULL, argv[optind], NULL, argv[optind + 1], 0);
|
||
|
||
/* Print any messages that were saved up for last. */
|
||
print_message_queue ();
|
||
|
||
if (ferror (stdout) || fclose (stdout) != 0)
|
||
fatal ("write error");
|
||
exit (val);
|
||
return val;
|
||
}
|
||
|
||
/* Add the compiled form of regexp PATTERN to REGLIST. */
|
||
|
||
static void
|
||
add_regexp (reglist, pattern)
|
||
struct regexp_list **reglist;
|
||
char *pattern;
|
||
{
|
||
struct regexp_list *r;
|
||
const char *m;
|
||
|
||
r = (struct regexp_list *) xmalloc (sizeof (*r));
|
||
bzero (r, sizeof (*r));
|
||
r->buf.fastmap = (char *) 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
|
||
usage ()
|
||
{
|
||
fprintf (stderr, "Usage: %s [options] from-file to-file\n", program);
|
||
fprintf (stderr, "Options:\n\
|
||
[-abBcdefhHilnNpPqrstTuvwy] [-C lines] [-D name] [-F regexp]\n\
|
||
[-I regexp] [-L from-label [-L to-label]] [-S starting-file] [-U lines]\n\
|
||
[-W columns] [-x pattern] [-X pattern-file] [--exclude=pattern]\n\
|
||
[--exclude-from=pattern-file] [--ignore-blank-lines] [--context[=lines]]\n\
|
||
[--ifdef=name] [--show-function-line=regexp] [--speed-large-files]\n\
|
||
[--label=from-label [--label=to-label]] [--new-file]\n");
|
||
fprintf (stderr, "\
|
||
[--ignore-matching-lines=regexp] [--unidirectional-new-file]\n\
|
||
[--starting-file=starting-file] [--initial-tab] [--width=columns]\n\
|
||
[--text] [--ignore-space-change] [--minimal] [--ed] [--forward-ed]\n\
|
||
[--ignore-case] [--paginate] [--rcs] [--show-c-function] [--brief]\n\
|
||
[--recursive] [--report-identical-files] [--expand-tabs] [--version]\n");
|
||
fprintf (stderr, "\
|
||
[--ignore-all-space] [--side-by-side] [--unified[=lines]]\n\
|
||
[--left-column] [--suppress-common-lines] [--sdiff-merge-assist]\n\
|
||
[--old-line-format=format] [--new-line-format=format]\n\
|
||
[--unchanged-line-format=format]\n\
|
||
[--old-group-format=format] [--new-group-format=format]\n\
|
||
[--unchanged-group-format=format] [--changed-group-format=format]\n\
|
||
[--horizon-lines=lines]\n");
|
||
exit (2);
|
||
}
|
||
|
||
static int
|
||
specify_format (var, value)
|
||
const char **var;
|
||
const 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;
|
||
}
|
||
|
||
/* 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 *dir0, *dir1;
|
||
char *name0, *name1;
|
||
int depth;
|
||
{
|
||
struct file_data inf[2];
|
||
register int i;
|
||
int val;
|
||
int same_files;
|
||
int errorcount = 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 *name = name0 == 0 ? name1 : name0;
|
||
char *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;
|
||
}
|
||
|
||
/* Mark any nonexistent file with -1 in the desc field. */
|
||
/* Mark unopened files (i.e. 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 : concat (dir0, "/", name0);
|
||
inf[1].name = dir1 == 0 ? name1 : concat (dir1, "/", name1);
|
||
|
||
/* Stat the files. Record whether they are directories. */
|
||
|
||
for (i = 0; i <= 1; i++)
|
||
{
|
||
bzero (&inf[i].stat, sizeof (struct stat));
|
||
inf[i].dir_p = 0;
|
||
|
||
if (inf[i].desc != -1)
|
||
{
|
||
int stat_result;
|
||
|
||
if (strcmp (inf[i].name, "-") == 0)
|
||
{
|
||
inf[i].desc = 0;
|
||
inf[i].name = "Standard Input";
|
||
stat_result = fstat (0, &inf[i].stat);
|
||
}
|
||
else
|
||
stat_result = stat (inf[i].name, &inf[i].stat);
|
||
|
||
if (stat_result != 0)
|
||
{
|
||
perror_with_name (inf[i].name);
|
||
errorcount = 1;
|
||
}
|
||
else
|
||
inf[i].dir_p = S_ISDIR (inf[i].stat.st_mode) && inf[i].desc != 0;
|
||
}
|
||
}
|
||
|
||
if (name0 == 0)
|
||
inf[0].dir_p = inf[1].dir_p;
|
||
if (name1 == 0)
|
||
inf[1].dir_p = inf[0].dir_p;
|
||
|
||
if (errorcount == 0 && 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 *p = rindex (inf[fnm_arg].name, '/');
|
||
char *filename = inf[dir_arg].name
|
||
= concat (inf[dir_arg].name, "/", (p ? p+1 : inf[fnm_arg].name));
|
||
|
||
if (inf[fnm_arg].desc == 0)
|
||
fatal ("can't compare - to a directory");
|
||
|
||
if (stat (filename, &inf[dir_arg].stat) != 0)
|
||
{
|
||
perror_with_name (filename);
|
||
errorcount = 1;
|
||
}
|
||
else
|
||
inf[dir_arg].dir_p = S_ISDIR (inf[dir_arg].stat.st_mode);
|
||
}
|
||
|
||
if (errorcount)
|
||
{
|
||
|
||
/* If either file should exist but does not, return 2. */
|
||
|
||
val = 2;
|
||
|
||
}
|
||
else if ((same_files = inf[0].stat.st_ino == inf[1].stat.st_ino
|
||
&& inf[0].stat.st_dev == inf[1].stat.st_dev
|
||
&& inf[0].desc != -1
|
||
&& inf[1].desc != -1)
|
||
&& 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)
|
||
{
|
||
/* 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 (recursive
|
||
&& (entire_new_file_flag
|
||
|| (unidirectional_new_file_flag && inf[0].desc == -1)))
|
||
val = diff_dirs (inf, compare_files, depth);
|
||
else
|
||
{
|
||
char *dir = (inf[0].desc == -1) ? dir1 : dir0;
|
||
message ("Only in %s: %s\n", dir, name0);
|
||
val = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We have a subdirectory in one directory
|
||
and a file in the other. */
|
||
|
||
message ("%s is a directory but %s is not\n",
|
||
inf[1 - inf[0].dir_p].name, inf[inf[0].dir_p].name);
|
||
|
||
/* This is a difference. */
|
||
val = 1;
|
||
}
|
||
}
|
||
else if (no_details_flag
|
||
&& 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);
|
||
errorcount = 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);
|
||
errorcount = 1;
|
||
}
|
||
|
||
/* Compare the files, if no error was found. */
|
||
|
||
val = errorcount ? 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 (dir0 != 0)
|
||
free (inf[0].name);
|
||
if (dir1 != 0)
|
||
free (inf[1].name);
|
||
|
||
return val;
|
||
}
|