1 /* GNU DIFF entry routine.
2 Copyright (C) 1988, 1989, 1992, 1993, 1994, 1997, 1998 Free Software Foundation, Inc.
4 This file is part of GNU DIFF.
6 GNU DIFF is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU DIFF is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
18 /* GNU DIFF was written by Mike Haertel, David Hayes,
19 Richard Stallman, Len Tower, and Paul Eggert. */
27 # include <fnmatch.h> /* This is supposed to be available on Posix systems */
28 #else /* HAVE_FNMATCH */
29 # include "fnmatch.h" /* Our substitute */
30 #endif /* HAVE_FNMATCH */
33 #define DEFAULT_WIDTH 130
36 #ifndef GUTTER_WIDTH_MINIMUM
37 #define GUTTER_WIDTH_MINIMUM 3
40 /* diff.c has a real initialize_main function. */
41 #ifdef initialize_main
42 #undef initialize_main
45 static char const *filetype PARAMS((struct stat const *));
46 static char *option_list PARAMS((char **, int));
47 static int add_exclude_file PARAMS((char const *));
48 static int ck_atoi PARAMS((char const *, int *));
49 static int compare_files PARAMS((char const *, char const *, char const *, char const *, int));
50 static int specify_format PARAMS((char **, char *));
51 static void add_exclude PARAMS((char const *));
52 static void add_regexp PARAMS((struct regexp_list **, char const *));
53 static void specify_style PARAMS((enum output_style));
54 static int try_help PARAMS((char const *));
55 static void check_output PARAMS((FILE *));
56 static void usage PARAMS((void));
57 static void initialize_main PARAMS((int *, char ***));
59 /* Nonzero for -r: if comparing two directories,
60 compare their common subdirectories recursively. */
64 /* For debugging: don't do discard_confusing_lines. */
69 /* I/O mode: nonzero only if using binary input/output. */
70 static int binary_I_O;
73 /* Return a string containing the command options with which diff was invoked.
74 Spaces appear between what were separate ARGV-elements.
75 There is a space at the beginning but none at the end.
76 If there were no options, the result is an empty string.
78 Arguments: OPTIONVEC, a vector containing separate ARGV-elements, and COUNT,
79 the length of that vector. */
82 option_list (optionvec, count)
83 char **optionvec; /* Was `vector', but that collides on Alliant. */
90 for (i = 0; i < count; i++)
91 length += strlen (optionvec[i]) + 1;
93 result = xmalloc (length + 1);
96 for (i = 0; i < count; i++)
99 strcat (result, optionvec[i]);
105 /* Convert STR to a positive integer, storing the result in *OUT.
106 If STR is not a valid integer, return -1 (otherwise 0). */
113 for (p = str; *p; p++)
114 if (*p < '0' || *p > '9')
117 *out = atoi (optarg);
121 /* Keep track of excluded file name patterns. */
123 static char const **exclude;
124 static int exclude_alloc, exclude_count;
127 excluded_filename (f)
131 for (i = 0; i < exclude_count; i++)
132 if (fnmatch (exclude[i], f, 0) == 0)
138 add_exclude (pattern)
141 if (exclude_alloc <= exclude_count)
142 exclude = (char const **)
144 ? xmalloc ((exclude_alloc = 64) * sizeof (*exclude))
145 : xrealloc (exclude, (exclude_alloc *= 2) * sizeof (*exclude)));
147 exclude[exclude_count++] = pattern;
151 add_exclude_file (name)
158 f.desc = (strcmp (optarg, "-") == 0
160 : open (optarg, O_RDONLY, 0));
161 if (f.desc < 0 || fstat (f.desc, &f.stat) != 0)
167 for (p = f.buffer, lim = p + f.buffered_chars; p < lim; p = q)
169 q = (char *) memchr (p, '\n', lim - p);
176 return close (f.desc);
179 /* The numbers 129- that appear in the fourth element of some entries
180 tell the big switch in `diff_run' how to process those options. */
182 static struct option const longopts[] =
184 {"ignore-blank-lines", 0, 0, 'B'},
185 {"context", 2, 0, 'C'},
186 {"ifdef", 1, 0, 'D'},
187 {"show-function-line", 1, 0, 'F'},
188 {"speed-large-files", 0, 0, 'H'},
189 {"ignore-matching-lines", 1, 0, 'I'},
190 {"label", 1, 0, 'L'},
191 {"file-label", 1, 0, 'L'}, /* An alias, no longer recommended */
192 {"new-file", 0, 0, 'N'},
193 {"entire-new-file", 0, 0, 'N'}, /* An alias, no longer recommended */
194 {"unidirectional-new-file", 0, 0, 'P'},
195 {"starting-file", 1, 0, 'S'},
196 {"initial-tab", 0, 0, 'T'},
197 {"width", 1, 0, 'W'},
199 {"ascii", 0, 0, 'a'}, /* An alias, no longer recommended */
200 {"ignore-space-change", 0, 0, 'b'},
201 {"minimal", 0, 0, 'd'},
203 {"forward-ed", 0, 0, 'f'},
204 {"ignore-case", 0, 0, 'i'},
205 {"paginate", 0, 0, 'l'},
206 {"print", 0, 0, 'l'}, /* An alias, no longer recommended */
208 {"show-c-function", 0, 0, 'p'},
209 {"brief", 0, 0, 'q'},
210 {"recursive", 0, 0, 'r'},
211 {"report-identical-files", 0, 0, 's'},
212 {"expand-tabs", 0, 0, 't'},
213 {"version", 0, 0, 'v'},
214 {"ignore-all-space", 0, 0, 'w'},
215 {"exclude", 1, 0, 'x'},
216 {"exclude-from", 1, 0, 'X'},
217 {"side-by-side", 0, 0, 'y'},
218 {"unified", 2, 0, 'U'},
219 {"left-column", 0, 0, 129},
220 {"suppress-common-lines", 0, 0, 130},
221 {"sdiff-merge-assist", 0, 0, 131},
222 {"old-line-format", 1, 0, 132},
223 {"new-line-format", 1, 0, 133},
224 {"unchanged-line-format", 1, 0, 134},
225 {"line-format", 1, 0, 135},
226 {"old-group-format", 1, 0, 136},
227 {"new-group-format", 1, 0, 137},
228 {"unchanged-group-format", 1, 0, 138},
229 {"changed-group-format", 1, 0, 139},
230 {"horizon-lines", 1, 0, 140},
232 {"binary", 0, 0, 142},
239 diff_run (argc, argv, out, callbacks_arg)
243 const struct diff_callbacks *callbacks_arg;
248 int width = DEFAULT_WIDTH;
249 int show_c_function = 0;
253 callbacks = callbacks_arg;
255 /* Do our initializations. */
256 initialize_main (&argc, &argv);
260 /* Set the jump buffer, so that diff may abort execution without
261 terminating the process. */
262 val = setjmp (diff_abort_buf);
271 /* Decode the options. */
272 while ((c = getopt_long (argc, argv,
273 "0123456789abBcC:dD:efF:hHiI:lL:nNpPqrsS:tTuU:vwW:x:X:y",
274 longopts, 0)) != EOF)
278 /* All digits combine in decimal to specify the context-size. */
291 /* If a context length has already been specified,
292 more digits allowed only if they follow right after the others.
293 Reject two separate runs of digits, or digits after -C. */
294 else if (prev < '0' || prev > '9')
295 fatal ("context length specified twice");
297 context = context * 10 + c - '0';
301 /* Treat all files as text files; never treat as binary. */
302 always_text_flag = 1;
306 /* Ignore changes in amount of white space. */
307 ignore_space_change_flag = 1;
308 ignore_some_changes = 1;
309 ignore_some_line_changes = 1;
313 /* Ignore changes affecting only blank lines. */
314 ignore_blank_lines_flag = 1;
315 ignore_some_changes = 1;
318 case 'C': /* +context[=lines] */
319 case 'U': /* +unified[=lines] */
323 fatal ("context length specified twice");
325 if (ck_atoi (optarg, &context))
326 fatal ("invalid context length argument");
331 /* Make context-style output. */
332 specify_style (c == 'U' ? OUTPUT_UNIFIED : OUTPUT_CONTEXT);
336 /* Don't discard lines. This makes things slower (sometimes much
337 slower) but will find a guaranteed minimal set of changes. */
342 /* Make merged #ifdef output. */
343 specify_style (OUTPUT_IFDEF);
346 static char const C_ifdef_group_formats[] =
347 "#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";
348 char *b = xmalloc (sizeof (C_ifdef_group_formats)
349 + 7 * strlen(optarg) - 14 /* 7*"%s" */
350 - 8 /* 5*"%%" + 3*"%c" */);
351 sprintf (b, C_ifdef_group_formats,
353 optarg, optarg, 0, 0,
354 optarg, optarg, optarg);
355 for (i = 0; i < 4; i++)
357 err |= specify_format (&group_format[i], b);
361 diff_error ("conflicting #ifdef formats", 0, 0);
366 /* Make output that is a valid `ed' script. */
367 specify_style (OUTPUT_ED);
371 /* Make output that looks vaguely like an `ed' script
372 but has changes in the order they appear in the file. */
373 specify_style (OUTPUT_FORWARD_ED);
377 /* Show, for each set of changes, the previous line that
378 matches the specified regexp. Currently affects only
379 context-style output. */
380 add_regexp (&function_regexp_list, optarg);
384 /* Split the files into chunks of around 1500 lines
385 for faster processing. Usually does not change the result.
387 This currently has no effect. */
391 /* Turn on heuristics that speed processing of large files
392 with a small density of changes. */
397 /* Ignore changes in case. */
398 ignore_case_flag = 1;
399 ignore_some_changes = 1;
400 ignore_some_line_changes = 1;
404 /* Ignore changes affecting only lines that match the
406 add_regexp (&ignore_regexp_list, optarg);
407 ignore_some_changes = 1;
411 /* Pass the output through `pr' to paginate it. */
413 #if !defined(SIGCHLD) && defined(SIGCLD)
414 #define SIGCHLD SIGCLD
417 /* Pagination requires forking and waiting, and
418 System V fork+wait does not work if SIGCHLD is ignored. */
419 signal (SIGCHLD, SIG_DFL);
424 /* Specify file labels for `-c' output headers. */
426 file_label[0] = optarg;
427 else if (!file_label[1])
428 file_label[1] = optarg;
430 fatal ("too many file label options");
434 /* Output RCS-style diffs, like `-f' except that each command
435 specifies the number of lines affected. */
436 specify_style (OUTPUT_RCS);
440 /* When comparing directories, if a file appears only in one
441 directory, treat it as present but empty in the other. */
442 entire_new_file_flag = 1;
446 /* Make context-style output and show name of last C function. */
448 add_regexp (&function_regexp_list, "^[_a-zA-Z$]");
452 /* When comparing directories, if a file appears only in
453 the second directory of the two,
454 treat it as present but empty in the other. */
455 unidirectional_new_file_flag = 1;
463 /* When comparing directories,
464 recursively compare any subdirectories found. */
469 /* Print a message if the files are the same. */
470 print_file_same_flag = 1;
474 /* When comparing directories, start with the specified
475 file name. This is used for resuming an aborted comparison. */
476 dir_start_file = optarg;
480 /* Expand tabs to spaces in the output so that it preserves
481 the alignment of the input files. */
486 /* Use a tab in the output, rather than a space, before the
487 text of an input line, so as to keep the proper alignment
488 in the input line without changing the characters in it. */
493 /* Output the context diff in unidiff format. */
494 specify_style (OUTPUT_UNIFIED);
498 if (callbacks && callbacks->write_stdout)
500 (*callbacks->write_stdout) ("diff - GNU diffutils version ");
501 (*callbacks->write_stdout) (diff_version_string);
502 (*callbacks->write_stdout) ("\n");
505 printf ("diff - GNU diffutils version %s\n", diff_version_string);
509 /* Ignore horizontal white space when comparing lines. */
510 ignore_all_space_flag = 1;
511 ignore_some_changes = 1;
512 ignore_some_line_changes = 1;
516 add_exclude (optarg);
520 if (add_exclude_file (optarg) != 0)
521 pfatal_with_name (optarg);
525 /* Use side-by-side (sdiff-style) columnar output. */
526 specify_style (OUTPUT_SDIFF);
530 /* Set the line width for OUTPUT_SDIFF. */
531 if (ck_atoi (optarg, &width) || width <= 0)
532 fatal ("column width must be a positive integer");
540 sdiff_skip_common_lines = 1;
544 /* sdiff-style columns output. */
545 specify_style (OUTPUT_SDIFF);
546 sdiff_help_sdiff = 1;
552 specify_style (OUTPUT_IFDEF);
553 if (specify_format (&line_format[c - 132], optarg) != 0)
554 diff_error ("conflicting line format", 0, 0);
558 specify_style (OUTPUT_IFDEF);
561 for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
562 err |= specify_format (&line_format[i], optarg);
564 diff_error ("conflicting line format", 0, 0);
572 specify_style (OUTPUT_IFDEF);
573 if (specify_format (&group_format[c - 136], optarg) != 0)
574 diff_error ("conflicting group format", 0, 0);
578 if (ck_atoi (optarg, &horizon_lines) || horizon_lines < 0)
579 fatal ("horizon must be a nonnegative integer");
584 if (! callbacks || ! callbacks->write_stdout)
585 check_output (stdout);
589 /* Use binary I/O when reading and writing data.
590 On Posix hosts, this has no effect. */
594 /* Because this code is leftover from pre-library days,
595 there is no way to set stdout back to the default mode
596 when we are done. As it turns out, I think the only
597 parts of CVS that pass out == NULL, and thus cause diff
598 to write to stdout, are "cvs diff" and "cvs rdiff". So
599 I'm not going to worry about this too much yet. */
600 setmode (STDOUT_FILENO, O_BINARY);
603 error (0, 0, "warning: did not set stdout to binary mode");
614 if (argc - optind != 2)
615 return try_help (argc - optind < 2 ? "missing operand" : "extra operand");
619 * We maximize first the half line width, and then the gutter width,
620 * according to the following constraints:
621 * 1. Two half lines plus a gutter must fit in a line.
622 * 2. If the half line width is nonzero:
623 * a. The gutter width is at least GUTTER_WIDTH_MINIMUM.
624 * b. If tabs are not expanded to spaces,
625 * a half line plus a gutter is an integral number of tabs,
626 * so that tabs in the right column line up.
628 int t = tab_expand_flag ? 1 : TAB_WIDTH;
629 int off = (width + t + GUTTER_WIDTH_MINIMUM) / (2*t) * t;
630 sdiff_half_width = max (0, min (off - GUTTER_WIDTH_MINIMUM, width - off)),
631 sdiff_column2_offset = sdiff_half_width ? off : width;
634 if (show_c_function && output_style != OUTPUT_UNIFIED)
635 specify_style (OUTPUT_CONTEXT);
637 if (output_style != OUTPUT_CONTEXT && output_style != OUTPUT_UNIFIED)
639 else if (context == -1)
640 /* Default amount of context for -c. */
643 if (output_style == OUTPUT_IFDEF)
645 /* Format arrays are char *, not char const *,
646 because integer formats are temporarily modified.
647 But it is safe to assign a constant like "%=" to a format array,
648 since "%=" does not format any integers. */
650 for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
652 line_format[i] = "%l\n";
653 if (!group_format[OLD])
655 = group_format[UNCHANGED] ? group_format[UNCHANGED] : "%<";
656 if (!group_format[NEW])
658 = group_format[UNCHANGED] ? group_format[UNCHANGED] : "%>";
659 if (!group_format[UNCHANGED])
660 group_format[UNCHANGED] = "%=";
661 if (!group_format[CHANGED])
662 group_format[CHANGED] = concat (group_format[OLD],
663 group_format[NEW], "");
666 no_diff_means_no_output =
667 (output_style == OUTPUT_IFDEF ?
668 (!*group_format[UNCHANGED]
669 || (strcmp (group_format[UNCHANGED], "%=") == 0
670 && !*line_format[UNCHANGED]))
671 : output_style == OUTPUT_SDIFF ? sdiff_skip_common_lines : 1);
673 switch_string = option_list (argv + 1, optind - 1);
675 if (callbacks && callbacks->write_output)
679 diff_error ("write callback with output file", 0, 0);
690 /* A diff which is full of ^Z and such isn't going to work
691 very well in text mode. */
693 outfile = fopen (out, "wb");
696 outfile = fopen (out, "w");
699 perror_with_name ("could not open output file");
706 val = compare_files (0, argv[optind], 0, argv[optind + 1], 0);
708 /* Print any messages that were saved up for last. */
709 print_message_queue ();
711 free (switch_string);
715 if (! callbacks || ! callbacks->write_output)
716 check_output (outfile);
719 if (fclose (outfile) != 0)
720 perror_with_name ("close error on output file");
725 /* Add the compiled form of regexp PATTERN to REGLIST. */
728 add_regexp (reglist, pattern)
729 struct regexp_list **reglist;
732 struct regexp_list *r;
735 r = (struct regexp_list *) xmalloc (sizeof (*r));
736 bzero (r, sizeof (*r));
737 r->buf.fastmap = xmalloc (256);
738 m = re_compile_pattern (pattern, strlen (pattern), &r->buf);
740 diff_error ("%s: %s", pattern, m);
742 /* Add to the start of the list, since it's easier than the end. */
752 diff_error ("%s", reason, 0);
753 diff_error ("Try `%s --help' for more information.", diff_program_name, 0);
761 if (ferror (file) || fflush (file) != 0)
762 fatal ("write error");
765 static char const * const option_help[] = {
766 "-i --ignore-case Consider upper- and lower-case to be the same.",
767 "-w --ignore-all-space Ignore all white space.",
768 "-b --ignore-space-change Ignore changes in the amount of white space.",
769 "-B --ignore-blank-lines Ignore changes whose lines are all blank.",
770 "-I RE --ignore-matching-lines=RE Ignore changes whose lines all match RE.",
772 "--binary Read and write data in binary mode.",
774 "-a --text Treat all files as text.\n",
775 "-c -C NUM --context[=NUM] Output NUM (default 2) lines of copied context.",
776 "-u -U NUM --unified[=NUM] Output NUM (default 2) lines of unified context.",
777 " -NUM Use NUM context lines.",
778 " -L LABEL --label LABEL Use LABEL instead of file name.",
779 " -p --show-c-function Show which C function each change is in.",
780 " -F RE --show-function-line=RE Show the most recent line matching RE.",
781 "-q --brief Output only whether files differ.",
782 "-e --ed Output an ed script.",
783 "-n --rcs Output an RCS format diff.",
784 "-y --side-by-side Output in two columns.",
785 " -W NUM --width=NUM Output at most NUM (default 130) characters per line.",
786 " --left-column Output only the left column of common lines.",
787 " --suppress-common-lines Do not output common lines.",
788 "-DNAME --ifdef=NAME Output merged file to show `#ifdef NAME' diffs.",
789 "--GTYPE-group-format=GFMT Similar, but format GTYPE input groups with GFMT.",
790 "--line-format=LFMT Similar, but format all input lines with LFMT.",
791 "--LTYPE-line-format=LFMT Similar, but format LTYPE input lines with LFMT.",
792 " LTYPE is `old', `new', or `unchanged'. GTYPE is LTYPE or `changed'.",
793 " GFMT may contain:",
794 " %< lines from FILE1",
795 " %> lines from FILE2",
796 " %= lines common to FILE1 and FILE2",
797 " %[-][WIDTH][.[PREC]]{doxX}LETTER printf-style spec for LETTER",
798 " LETTERs are as follows for new group, lower case for old group:",
799 " F first line number",
800 " L last line number",
801 " N number of lines = L-F+1",
804 " LFMT may contain:",
805 " %L contents of line",
806 " %l contents of line, excluding any trailing newline",
807 " %[-][WIDTH][.[PREC]]{doxX}n printf-style spec for input line number",
808 " Either GFMT or LFMT may contain:",
810 " %c'C' the single character C",
811 " %c'\\OOO' the character with octal code OOO\n",
812 "-l --paginate Pass the output through `pr' to paginate it.",
813 "-t --expand-tabs Expand tabs to spaces in output.",
814 "-T --initial-tab Make tabs line up by prepending a tab.\n",
815 "-r --recursive Recursively compare any subdirectories found.",
816 "-N --new-file Treat absent files as empty.",
817 "-P --unidirectional-new-file Treat absent first files as empty.",
818 "-s --report-identical-files Report when two files are the same.",
819 "-x PAT --exclude=PAT Exclude files that match PAT.",
820 "-X FILE --exclude-from=FILE Exclude files that match any pattern in FILE.",
821 "-S FILE --starting-file=FILE Start with FILE when comparing directories.\n",
822 "--horizon-lines=NUM Keep NUM lines of the common prefix and suffix.",
823 "-d --minimal Try hard to find a smaller set of changes.",
824 "-H --speed-large-files Assume large files and many scattered small changes.\n",
825 "-v --version Output version info.",
826 "--help Output this help.",
833 char const * const *p;
835 if (callbacks && callbacks->write_stdout)
837 (*callbacks->write_stdout) ("Usage: ");
838 (*callbacks->write_stdout) (diff_program_name);
839 (*callbacks->write_stdout) (" [OPTION]... FILE1 FILE2\n\n");
840 for (p = option_help; *p; p++)
842 (*callbacks->write_stdout) (" ");
843 (*callbacks->write_stdout) (*p);
844 (*callbacks->write_stdout) ("\n");
846 (*callbacks->write_stdout)
847 ("\nIf FILE1 or FILE2 is `-', read standard input.\n");
851 printf ("Usage: %s [OPTION]... FILE1 FILE2\n\n", diff_program_name);
852 for (p = option_help; *p; p++)
853 printf (" %s\n", *p);
854 printf ("\nIf FILE1 or FILE2 is `-', read standard input.\n");
859 specify_format (var, value)
863 int err = *var ? strcmp (*var, value) : 0;
869 specify_style (style)
870 enum output_style style;
872 if (output_style != OUTPUT_NORMAL
873 && output_style != style)
874 diff_error ("conflicting specifications of output style", 0, 0);
875 output_style = style;
880 struct stat const *st;
882 /* See Posix.2 section 4.17.6.1.1 and Table 5-1 for these formats.
883 To keep diagnostics grammatical, the returned string must start
886 if (S_ISREG (st->st_mode))
888 if (st->st_size == 0)
889 return "regular empty file";
890 /* Posix.2 section 5.14.2 seems to suggest that we must read the file
891 and guess whether it's C, Fortran, etc., but this is somewhat useless
892 and doesn't reflect historical practice. We're allowed to guess
893 wrong, so we don't bother to read the file. */
894 return "regular file";
896 if (S_ISDIR (st->st_mode)) return "directory";
898 /* other Posix.1 file types */
900 if (S_ISBLK (st->st_mode)) return "block special file";
903 if (S_ISCHR (st->st_mode)) return "character special file";
906 if (S_ISFIFO (st->st_mode)) return "fifo";
909 /* other Posix.1b file types */
911 if (S_TYPEISMQ (st)) return "message queue";
914 if (S_TYPEISSEM (st)) return "semaphore";
917 if (S_TYPEISSHM (st)) return "shared memory object";
920 /* other popular file types */
921 /* S_ISLNK is impossible with `fstat' and `stat'. */
923 if (S_ISSOCK (st->st_mode)) return "socket";
929 /* Compare two files (or dirs) with specified names
930 DIR0/NAME0 and DIR1/NAME1, at level DEPTH in directory recursion.
931 (if DIR0 is 0, then the name is just NAME0, etc.)
932 This is self-contained; it opens the files and closes them.
934 Value is 0 if files are the same, 1 if different,
935 2 if there is a problem opening them. */
938 compare_files (dir0, name0, dir1, name1, depth)
939 char const *dir0, *dir1;
940 char const *name0, *name1;
943 struct file_data inf[2];
948 char *free0 = 0, *free1 = 0;
950 /* If this is directory comparison, perhaps we have a file
951 that exists only in one of the directories.
952 If so, just print a message to that effect. */
954 if (! ((name0 != 0 && name1 != 0)
955 || (unidirectional_new_file_flag && name1 != 0)
956 || entire_new_file_flag))
958 char const *name = name0 == 0 ? name1 : name0;
959 char const *dir = name0 == 0 ? dir1 : dir0;
960 message ("Only in %s: %s\n", dir, name);
961 /* Return 1 so that diff_dirs will return 1 ("some files differ"). */
965 bzero (inf, sizeof (inf));
967 /* Mark any nonexistent file with -1 in the desc field. */
968 /* Mark unopened files (e.g. directories) with -2. */
970 inf[0].desc = name0 == 0 ? -1 : -2;
971 inf[1].desc = name1 == 0 ? -1 : -2;
973 /* Now record the full name of each file, including nonexistent ones. */
980 inf[0].name = dir0 == 0 ? name0 : (free0 = dir_file_pathname (dir0, name0));
981 inf[1].name = dir1 == 0 ? name1 : (free1 = dir_file_pathname (dir1, name1));
983 /* Stat the files. Record whether they are directories. */
985 for (i = 0; i <= 1; i++)
987 if (inf[i].desc != -1)
991 if (i && filename_cmp (inf[i].name, inf[0].name) == 0)
993 inf[i].stat = inf[0].stat;
996 else if (strcmp (inf[i].name, "-") == 0)
998 inf[i].desc = STDIN_FILENO;
999 stat_result = fstat (STDIN_FILENO, &inf[i].stat);
1000 if (stat_result == 0 && S_ISREG (inf[i].stat.st_mode))
1002 off_t pos = lseek (STDIN_FILENO, (off_t) 0, SEEK_CUR);
1007 if (pos <= inf[i].stat.st_size)
1008 inf[i].stat.st_size -= pos;
1010 inf[i].stat.st_size = 0;
1011 /* Posix.2 4.17.6.1.4 requires current time for stdin. */
1012 time (&inf[i].stat.st_mtime);
1017 stat_result = stat (inf[i].name, &inf[i].stat);
1019 if (stat_result != 0)
1021 perror_with_name (inf[i].name);
1026 inf[i].dir_p = S_ISDIR (inf[i].stat.st_mode) && inf[i].desc != 0;
1027 if (inf[1 - i].desc == -1)
1029 inf[1 - i].dir_p = inf[i].dir_p;
1030 inf[1 - i].stat.st_mode = inf[i].stat.st_mode;
1036 if (! failed && depth == 0 && inf[0].dir_p != inf[1].dir_p)
1038 /* If one is a directory, and it was specified in the command line,
1039 use the file in that dir with the other file's basename. */
1041 int fnm_arg = inf[0].dir_p;
1042 int dir_arg = 1 - fnm_arg;
1043 char const *fnm = inf[fnm_arg].name;
1044 char const *dir = inf[dir_arg].name;
1045 char const *p = filename_lastdirchar (fnm);
1046 char const *filename = inf[dir_arg].name
1047 = dir_file_pathname (dir, p ? p + 1 : fnm);
1049 if (strcmp (fnm, "-") == 0)
1050 fatal ("can't compare - to a directory");
1052 if (stat (filename, &inf[dir_arg].stat) != 0)
1054 perror_with_name (filename);
1058 inf[dir_arg].dir_p = S_ISDIR (inf[dir_arg].stat.st_mode);
1064 /* If either file should exist but does not, return 2. */
1069 else if ((same_files = inf[0].desc != -1 && inf[1].desc != -1
1070 && 0 < same_file (&inf[0].stat, &inf[1].stat))
1071 && no_diff_means_no_output)
1073 /* The two named files are actually the same physical file.
1074 We know they are identical without actually reading them. */
1078 else if (inf[0].dir_p & inf[1].dir_p)
1080 if (output_style == OUTPUT_IFDEF)
1081 fatal ("-D option not supported with directories");
1083 /* If both are directories, compare the files in them. */
1085 if (depth > 0 && !recursive)
1087 /* But don't compare dir contents one level down
1088 unless -r was specified. */
1089 message ("Common subdirectories: %s and %s\n",
1090 inf[0].name, inf[1].name);
1095 val = diff_dirs (inf, compare_files, depth);
1099 else if ((inf[0].dir_p | inf[1].dir_p)
1101 && (! S_ISREG (inf[0].stat.st_mode)
1102 || ! S_ISREG (inf[1].stat.st_mode))))
1104 /* Perhaps we have a subdirectory that exists only in one directory.
1105 If so, just print a message to that effect. */
1107 if (inf[0].desc == -1 || inf[1].desc == -1)
1109 if ((inf[0].dir_p | inf[1].dir_p)
1111 && (entire_new_file_flag
1112 || (unidirectional_new_file_flag && inf[0].desc == -1)))
1113 val = diff_dirs (inf, compare_files, depth);
1116 char const *dir = (inf[0].desc == -1) ? dir1 : dir0;
1117 /* See Posix.2 section 4.17.6.1.1 for this format. */
1118 message ("Only in %s: %s\n", dir, name0);
1124 /* We have two files that are not to be compared. */
1126 /* See Posix.2 section 4.17.6.1.1 for this format. */
1127 message5 ("File %s is a %s while file %s is a %s\n",
1128 inf[0].name, filetype (&inf[0].stat),
1129 inf[1].name, filetype (&inf[1].stat));
1131 /* This is a difference. */
1135 else if ((no_details_flag & ~ignore_some_changes)
1136 && inf[0].stat.st_size != inf[1].stat.st_size
1137 && (inf[0].desc == -1 || S_ISREG (inf[0].stat.st_mode))
1138 && (inf[1].desc == -1 || S_ISREG (inf[1].stat.st_mode)))
1140 message ("Files %s and %s differ\n", inf[0].name, inf[1].name);
1145 /* Both exist and neither is a directory. */
1147 /* Open the files and record their descriptors. */
1149 if (inf[0].desc == -2)
1150 if ((inf[0].desc = open (inf[0].name, O_RDONLY, 0)) < 0)
1152 perror_with_name (inf[0].name);
1155 if (inf[1].desc == -2)
1158 inf[1].desc = inf[0].desc;
1159 else if ((inf[1].desc = open (inf[1].name, O_RDONLY, 0)) < 0)
1161 perror_with_name (inf[1].name);
1168 for (i = 0; i <= 1; i++)
1169 if (0 <= inf[i].desc)
1170 setmode (inf[i].desc, O_BINARY);
1173 /* Compare the files, if no error was found. */
1175 val = failed ? 2 : diff_2_files (inf, depth);
1177 /* Close the file descriptors. */
1179 if (inf[0].desc >= 0 && close (inf[0].desc) != 0)
1181 perror_with_name (inf[0].name);
1184 if (inf[1].desc >= 0 && inf[0].desc != inf[1].desc
1185 && close (inf[1].desc) != 0)
1187 perror_with_name (inf[1].name);
1192 /* Now the comparison has been done, if no error prevented it,
1193 and VAL is the value this function will return. */
1195 if (val == 0 && !inf[0].dir_p)
1197 if (print_file_same_flag)
1198 message ("Files %s and %s are identical\n",
1199 inf[0].name, inf[1].name);
1212 /* Initialize status variables and flag variables used in libdiff,
1213 to permit repeated calls to diff_run. */
1216 initialize_main (argcp, argvp)
1220 /* These variables really must be reset each time diff_run is called. */
1221 output_style = OUTPUT_NORMAL;
1223 file_label[0] = NULL;
1224 file_label[1] = NULL;
1225 diff_program_name = (*argvp)[0];
1228 /* Reset these also, just for safety's sake. (If one invocation turns
1229 on ignore_case_flag, it must be turned off before diff_run is called
1230 again. But it is possible to make many diffs before encountering
1237 no_diff_means_no_output = 0;
1238 always_text_flag = 0;
1240 ignore_space_change_flag = 0;
1241 ignore_all_space_flag = 0;
1242 ignore_blank_lines_flag = 0;
1243 ignore_some_line_changes = 0;
1244 ignore_some_changes = 0;
1245 ignore_case_flag = 0;
1246 function_regexp_list = NULL;
1247 ignore_regexp_list = NULL;
1248 no_details_flag = 0;
1249 print_file_same_flag = 0;
1251 tab_expand_flag = 0;
1252 dir_start_file = NULL;
1253 entire_new_file_flag = 0;
1254 unidirectional_new_file_flag = 0;
1256 bzero (group_format, sizeof (group_format));
1257 bzero (line_format, sizeof (line_format));
1258 sdiff_help_sdiff = 0;
1259 sdiff_left_only = 0;
1260 sdiff_skip_common_lines = 0;
1261 sdiff_half_width = 0;
1262 sdiff_column2_offset = 0;
1263 switch_string = NULL;
1265 bzero (files, sizeof (files));