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. */
28 #define DEFAULT_WIDTH 130
31 #ifndef GUTTER_WIDTH_MINIMUM
32 #define GUTTER_WIDTH_MINIMUM 3
35 /* diff.c has a real initialize_main function. */
36 #ifdef initialize_main
37 #undef initialize_main
40 static char const *filetype PARAMS((struct stat const *));
41 static char *option_list PARAMS((char **, int));
42 static int add_exclude_file PARAMS((char const *));
43 static int ck_atoi PARAMS((char const *, int *));
44 static int compare_files PARAMS((char const *, char const *, char const *, char const *, int));
45 static int specify_format PARAMS((char **, char *));
46 static void add_exclude PARAMS((char const *));
47 static void add_regexp PARAMS((struct regexp_list **, char const *));
48 static void specify_style PARAMS((enum output_style));
49 static int try_help PARAMS((char const *));
50 static void check_output PARAMS((FILE *));
51 static void usage PARAMS((void));
52 static void initialize_main PARAMS((int *, char ***));
54 /* Nonzero for -r: if comparing two directories,
55 compare their common subdirectories recursively. */
59 /* For debugging: don't do discard_confusing_lines. */
64 /* I/O mode: nonzero only if using binary input/output. */
65 static int binary_I_O;
68 /* Return a string containing the command options with which diff was invoked.
69 Spaces appear between what were separate ARGV-elements.
70 There is a space at the beginning but none at the end.
71 If there were no options, the result is an empty string.
73 Arguments: OPTIONVEC, a vector containing separate ARGV-elements, and COUNT,
74 the length of that vector. */
77 option_list (optionvec, count)
78 char **optionvec; /* Was `vector', but that collides on Alliant. */
85 for (i = 0; i < count; i++)
86 length += strlen (optionvec[i]) + 1;
88 result = xmalloc (length + 1);
91 for (i = 0; i < count; i++)
94 strcat (result, optionvec[i]);
100 /* Convert STR to a positive integer, storing the result in *OUT.
101 If STR is not a valid integer, return -1 (otherwise 0). */
108 for (p = str; *p; p++)
109 if (*p < '0' || *p > '9')
112 *out = atoi (optarg);
116 /* Keep track of excluded file name patterns. */
118 static char const **exclude;
119 static int exclude_alloc, exclude_count;
122 excluded_filename (f)
126 for (i = 0; i < exclude_count; i++)
127 if (fnmatch (exclude[i], f, 0) == 0)
133 add_exclude (pattern)
136 if (exclude_alloc <= exclude_count)
137 exclude = (char const **)
139 ? xmalloc ((exclude_alloc = 64) * sizeof (*exclude))
140 : xrealloc (exclude, (exclude_alloc *= 2) * sizeof (*exclude)));
142 exclude[exclude_count++] = pattern;
146 add_exclude_file (name)
153 f.desc = (strcmp (optarg, "-") == 0
155 : open (optarg, O_RDONLY, 0));
156 if (f.desc < 0 || fstat (f.desc, &f.stat) != 0)
162 for (p = f.buffer, lim = p + f.buffered_chars; p < lim; p = q)
164 q = (char *) memchr (p, '\n', lim - p);
171 return close (f.desc);
174 /* The numbers 129- that appear in the fourth element of some entries
175 tell the big switch in `diff_run' how to process those options. */
177 static struct option const longopts[] =
179 {"ignore-blank-lines", 0, 0, 'B'},
180 {"context", 2, 0, 'C'},
181 {"ifdef", 1, 0, 'D'},
182 {"show-function-line", 1, 0, 'F'},
183 {"speed-large-files", 0, 0, 'H'},
184 {"ignore-matching-lines", 1, 0, 'I'},
185 {"label", 1, 0, 'L'},
186 {"file-label", 1, 0, 'L'}, /* An alias, no longer recommended */
187 {"new-file", 0, 0, 'N'},
188 {"entire-new-file", 0, 0, 'N'}, /* An alias, no longer recommended */
189 {"unidirectional-new-file", 0, 0, 'P'},
190 {"starting-file", 1, 0, 'S'},
191 {"initial-tab", 0, 0, 'T'},
192 {"width", 1, 0, 'W'},
194 {"ascii", 0, 0, 'a'}, /* An alias, no longer recommended */
195 {"ignore-space-change", 0, 0, 'b'},
196 {"minimal", 0, 0, 'd'},
198 {"forward-ed", 0, 0, 'f'},
199 {"ignore-case", 0, 0, 'i'},
200 {"paginate", 0, 0, 'l'},
201 {"print", 0, 0, 'l'}, /* An alias, no longer recommended */
203 {"show-c-function", 0, 0, 'p'},
204 {"brief", 0, 0, 'q'},
205 {"recursive", 0, 0, 'r'},
206 {"report-identical-files", 0, 0, 's'},
207 {"expand-tabs", 0, 0, 't'},
208 {"version", 0, 0, 'v'},
209 {"ignore-all-space", 0, 0, 'w'},
210 {"exclude", 1, 0, 'x'},
211 {"exclude-from", 1, 0, 'X'},
212 {"side-by-side", 0, 0, 'y'},
213 {"unified", 2, 0, 'U'},
214 {"left-column", 0, 0, 129},
215 {"suppress-common-lines", 0, 0, 130},
216 {"sdiff-merge-assist", 0, 0, 131},
217 {"old-line-format", 1, 0, 132},
218 {"new-line-format", 1, 0, 133},
219 {"unchanged-line-format", 1, 0, 134},
220 {"line-format", 1, 0, 135},
221 {"old-group-format", 1, 0, 136},
222 {"new-group-format", 1, 0, 137},
223 {"unchanged-group-format", 1, 0, 138},
224 {"changed-group-format", 1, 0, 139},
225 {"horizon-lines", 1, 0, 140},
227 {"binary", 0, 0, 142},
232 diff_run (argc, argv, out, callbacks_arg)
236 const struct diff_callbacks *callbacks_arg;
241 int width = DEFAULT_WIDTH;
242 int show_c_function = 0;
246 callbacks = callbacks_arg;
248 /* Do our initializations. */
249 initialize_main (&argc, &argv);
251 /* Decode the options. */
255 while ((c = getopt_long (argc, argv,
256 "0123456789abBcC:dD:efF:hHiI:lL:nNpPqrsS:tTuU:vwW:x:X:y",
257 longopts, 0)) != EOF)
261 /* All digits combine in decimal to specify the context-size. */
274 /* If a context length has already been specified,
275 more digits allowed only if they follow right after the others.
276 Reject two separate runs of digits, or digits after -C. */
277 else if (prev < '0' || prev > '9')
278 fatal ("context length specified twice");
280 context = context * 10 + c - '0';
284 /* Treat all files as text files; never treat as binary. */
285 always_text_flag = 1;
289 /* Ignore changes in amount of white space. */
290 ignore_space_change_flag = 1;
291 ignore_some_changes = 1;
292 ignore_some_line_changes = 1;
296 /* Ignore changes affecting only blank lines. */
297 ignore_blank_lines_flag = 1;
298 ignore_some_changes = 1;
301 case 'C': /* +context[=lines] */
302 case 'U': /* +unified[=lines] */
306 fatal ("context length specified twice");
308 if (ck_atoi (optarg, &context))
309 fatal ("invalid context length argument");
314 /* Make context-style output. */
315 specify_style (c == 'U' ? OUTPUT_UNIFIED : OUTPUT_CONTEXT);
319 /* Don't discard lines. This makes things slower (sometimes much
320 slower) but will find a guaranteed minimal set of changes. */
325 /* Make merged #ifdef output. */
326 specify_style (OUTPUT_IFDEF);
329 static char const C_ifdef_group_formats[] =
330 "#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";
331 char *b = xmalloc (sizeof (C_ifdef_group_formats)
332 + 7 * strlen(optarg) - 14 /* 7*"%s" */
333 - 8 /* 5*"%%" + 3*"%c" */);
334 sprintf (b, C_ifdef_group_formats,
336 optarg, optarg, 0, 0,
337 optarg, optarg, optarg);
338 for (i = 0; i < 4; i++)
340 err |= specify_format (&group_format[i], b);
344 diff_error ("conflicting #ifdef formats", 0, 0);
349 /* Make output that is a valid `ed' script. */
350 specify_style (OUTPUT_ED);
354 /* Make output that looks vaguely like an `ed' script
355 but has changes in the order they appear in the file. */
356 specify_style (OUTPUT_FORWARD_ED);
360 /* Show, for each set of changes, the previous line that
361 matches the specified regexp. Currently affects only
362 context-style output. */
363 add_regexp (&function_regexp_list, optarg);
367 /* Split the files into chunks of around 1500 lines
368 for faster processing. Usually does not change the result.
370 This currently has no effect. */
374 /* Turn on heuristics that speed processing of large files
375 with a small density of changes. */
380 /* Ignore changes in case. */
381 ignore_case_flag = 1;
382 ignore_some_changes = 1;
383 ignore_some_line_changes = 1;
387 /* Ignore changes affecting only lines that match the
389 add_regexp (&ignore_regexp_list, optarg);
390 ignore_some_changes = 1;
394 /* Pass the output through `pr' to paginate it. */
396 #if !defined(SIGCHLD) && defined(SIGCLD)
397 #define SIGCHLD SIGCLD
400 /* Pagination requires forking and waiting, and
401 System V fork+wait does not work if SIGCHLD is ignored. */
402 signal (SIGCHLD, SIG_DFL);
407 /* Specify file labels for `-c' output headers. */
409 file_label[0] = optarg;
410 else if (!file_label[1])
411 file_label[1] = optarg;
413 fatal ("too many file label options");
417 /* Output RCS-style diffs, like `-f' except that each command
418 specifies the number of lines affected. */
419 specify_style (OUTPUT_RCS);
423 /* When comparing directories, if a file appears only in one
424 directory, treat it as present but empty in the other. */
425 entire_new_file_flag = 1;
429 /* Make context-style output and show name of last C function. */
431 add_regexp (&function_regexp_list, "^[_a-zA-Z$]");
435 /* When comparing directories, if a file appears only in
436 the second directory of the two,
437 treat it as present but empty in the other. */
438 unidirectional_new_file_flag = 1;
446 /* When comparing directories,
447 recursively compare any subdirectories found. */
452 /* Print a message if the files are the same. */
453 print_file_same_flag = 1;
457 /* When comparing directories, start with the specified
458 file name. This is used for resuming an aborted comparison. */
459 dir_start_file = optarg;
463 /* Expand tabs to spaces in the output so that it preserves
464 the alignment of the input files. */
469 /* Use a tab in the output, rather than a space, before the
470 text of an input line, so as to keep the proper alignment
471 in the input line without changing the characters in it. */
476 /* Output the context diff in unidiff format. */
477 specify_style (OUTPUT_UNIFIED);
481 if (callbacks && callbacks->write_stdout)
483 (*callbacks->write_stdout) ("diff - GNU diffutils version ");
484 (*callbacks->write_stdout) (diff_version_string);
485 (*callbacks->write_stdout) ("\n");
488 printf ("diff - GNU diffutils version %s\n", diff_version_string);
492 /* Ignore horizontal white space when comparing lines. */
493 ignore_all_space_flag = 1;
494 ignore_some_changes = 1;
495 ignore_some_line_changes = 1;
499 add_exclude (optarg);
503 if (add_exclude_file (optarg) != 0)
504 pfatal_with_name (optarg);
508 /* Use side-by-side (sdiff-style) columnar output. */
509 specify_style (OUTPUT_SDIFF);
513 /* Set the line width for OUTPUT_SDIFF. */
514 if (ck_atoi (optarg, &width) || width <= 0)
515 fatal ("column width must be a positive integer");
523 sdiff_skip_common_lines = 1;
527 /* sdiff-style columns output. */
528 specify_style (OUTPUT_SDIFF);
529 sdiff_help_sdiff = 1;
535 specify_style (OUTPUT_IFDEF);
536 if (specify_format (&line_format[c - 132], optarg) != 0)
537 diff_error ("conflicting line format", 0, 0);
541 specify_style (OUTPUT_IFDEF);
544 for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
545 err |= specify_format (&line_format[i], optarg);
547 diff_error ("conflicting line format", 0, 0);
555 specify_style (OUTPUT_IFDEF);
556 if (specify_format (&group_format[c - 136], optarg) != 0)
557 diff_error ("conflicting group format", 0, 0);
561 if (ck_atoi (optarg, &horizon_lines) || horizon_lines < 0)
562 fatal ("horizon must be a nonnegative integer");
567 if (! callbacks || ! callbacks->write_stdout)
568 check_output (stdout);
572 /* Use binary I/O when reading and writing data.
573 On Posix hosts, this has no effect. */
577 /* Because this code is leftover from pre-library days,
578 there is no way to set stdout back to the default mode
579 when we are done. As it turns out, I think the only
580 parts of CVS that pass out == NULL, and thus cause diff
581 to write to stdout, are "cvs diff" and "cvs rdiff". So
582 I'm not going to worry about this too much yet. */
583 setmode (STDOUT_FILENO, O_BINARY);
586 error (0, 0, "warning: did not set stdout to binary mode");
597 if (argc - optind != 2)
598 return try_help (argc - optind < 2 ? "missing operand" : "extra operand");
602 * We maximize first the half line width, and then the gutter width,
603 * according to the following constraints:
604 * 1. Two half lines plus a gutter must fit in a line.
605 * 2. If the half line width is nonzero:
606 * a. The gutter width is at least GUTTER_WIDTH_MINIMUM.
607 * b. If tabs are not expanded to spaces,
608 * a half line plus a gutter is an integral number of tabs,
609 * so that tabs in the right column line up.
611 int t = tab_expand_flag ? 1 : TAB_WIDTH;
612 int off = (width + t + GUTTER_WIDTH_MINIMUM) / (2*t) * t;
613 sdiff_half_width = max (0, min (off - GUTTER_WIDTH_MINIMUM, width - off)),
614 sdiff_column2_offset = sdiff_half_width ? off : width;
617 if (show_c_function && output_style != OUTPUT_UNIFIED)
618 specify_style (OUTPUT_CONTEXT);
620 if (output_style != OUTPUT_CONTEXT && output_style != OUTPUT_UNIFIED)
622 else if (context == -1)
623 /* Default amount of context for -c. */
626 if (output_style == OUTPUT_IFDEF)
628 /* Format arrays are char *, not char const *,
629 because integer formats are temporarily modified.
630 But it is safe to assign a constant like "%=" to a format array,
631 since "%=" does not format any integers. */
633 for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
635 line_format[i] = "%l\n";
636 if (!group_format[OLD])
638 = group_format[UNCHANGED] ? group_format[UNCHANGED] : "%<";
639 if (!group_format[NEW])
641 = group_format[UNCHANGED] ? group_format[UNCHANGED] : "%>";
642 if (!group_format[UNCHANGED])
643 group_format[UNCHANGED] = "%=";
644 if (!group_format[CHANGED])
645 group_format[CHANGED] = concat (group_format[OLD],
646 group_format[NEW], "");
649 no_diff_means_no_output =
650 (output_style == OUTPUT_IFDEF ?
651 (!*group_format[UNCHANGED]
652 || (strcmp (group_format[UNCHANGED], "%=") == 0
653 && !*line_format[UNCHANGED]))
654 : output_style == OUTPUT_SDIFF ? sdiff_skip_common_lines : 1);
656 switch_string = option_list (argv + 1, optind - 1);
658 if (callbacks && callbacks->write_output)
662 diff_error ("write callback with output file", 0, 0);
673 /* A diff which is full of ^Z and such isn't going to work
674 very well in text mode. */
676 outfile = fopen (out, "wb");
679 outfile = fopen (out, "w");
682 perror_with_name ("could not open output file");
689 /* Set the jump buffer, so that diff may abort execution without
690 terminating the process. */
691 val = setjmp (diff_abort_buf);
700 val = compare_files (0, argv[optind], 0, argv[optind + 1], 0);
702 /* Print any messages that were saved up for last. */
703 print_message_queue ();
705 free (switch_string);
709 if (! callbacks || ! callbacks->write_output)
710 check_output (outfile);
713 if (fclose (outfile) != 0)
714 perror_with_name ("close error on output file");
719 /* Add the compiled form of regexp PATTERN to REGLIST. */
722 add_regexp (reglist, pattern)
723 struct regexp_list **reglist;
726 struct regexp_list *r;
729 r = (struct regexp_list *) xmalloc (sizeof (*r));
730 bzero (r, sizeof (*r));
731 r->buf.fastmap = xmalloc (256);
732 m = re_compile_pattern (pattern, strlen (pattern), &r->buf);
734 diff_error ("%s: %s", pattern, m);
736 /* Add to the start of the list, since it's easier than the end. */
746 diff_error ("%s", reason, 0);
747 diff_error ("Try `%s --help' for more information.", diff_program_name, 0);
755 if (ferror (file) || fflush (file) != 0)
756 fatal ("write error");
759 static char const * const option_help[] = {
760 "-i --ignore-case Consider upper- and lower-case to be the same.",
761 "-w --ignore-all-space Ignore all white space.",
762 "-b --ignore-space-change Ignore changes in the amount of white space.",
763 "-B --ignore-blank-lines Ignore changes whose lines are all blank.",
764 "-I RE --ignore-matching-lines=RE Ignore changes whose lines all match RE.",
766 "--binary Read and write data in binary mode.",
768 "-a --text Treat all files as text.\n",
769 "-c -C NUM --context[=NUM] Output NUM (default 2) lines of copied context.",
770 "-u -U NUM --unified[=NUM] Output NUM (default 2) lines of unified context.",
771 " -NUM Use NUM context lines.",
772 " -L LABEL --label LABEL Use LABEL instead of file name.",
773 " -p --show-c-function Show which C function each change is in.",
774 " -F RE --show-function-line=RE Show the most recent line matching RE.",
775 "-q --brief Output only whether files differ.",
776 "-e --ed Output an ed script.",
777 "-n --rcs Output an RCS format diff.",
778 "-y --side-by-side Output in two columns.",
779 " -w NUM --width=NUM Output at most NUM (default 130) characters per line.",
780 " --left-column Output only the left column of common lines.",
781 " --suppress-common-lines Do not output common lines.",
782 "-DNAME --ifdef=NAME Output merged file to show `#ifdef NAME' diffs.",
783 "--GTYPE-group-format=GFMT Similar, but format GTYPE input groups with GFMT.",
784 "--line-format=LFMT Similar, but format all input lines with LFMT.",
785 "--LTYPE-line-format=LFMT Similar, but format LTYPE input lines with LFMT.",
786 " LTYPE is `old', `new', or `unchanged'. GTYPE is LTYPE or `changed'.",
787 " GFMT may contain:",
788 " %< lines from FILE1",
789 " %> lines from FILE2",
790 " %= lines common to FILE1 and FILE2",
791 " %[-][WIDTH][.[PREC]]{doxX}LETTER printf-style spec for LETTER",
792 " LETTERs are as follows for new group, lower case for old group:",
793 " F first line number",
794 " L last line number",
795 " N number of lines = L-F+1",
798 " LFMT may contain:",
799 " %L contents of line",
800 " %l contents of line, excluding any trailing newline",
801 " %[-][WIDTH][.[PREC]]{doxX}n printf-style spec for input line number",
802 " Either GFMT or LFMT may contain:",
804 " %c'C' the single character C",
805 " %c'\\OOO' the character with octal code OOO\n",
806 "-l --paginate Pass the output through `pr' to paginate it.",
807 "-t --expand-tabs Expand tabs to spaces in output.",
808 "-T --initial-tab Make tabs line up by prepending a tab.\n",
809 "-r --recursive Recursively compare any subdirectories found.",
810 "-N --new-file Treat absent files as empty.",
811 "-P --unidirectional-new-file Treat absent first files as empty.",
812 "-s --report-identical-files Report when two files are the same.",
813 "-x PAT --exclude=PAT Exclude files that match PAT.",
814 "-X FILE --exclude-from=FILE Exclude files that match any pattern in FILE.",
815 "-S FILE --starting-file=FILE Start with FILE when comparing directories.\n",
816 "--horizon-lines=NUM Keep NUM lines of the common prefix and suffix.",
817 "-d --minimal Try hard to find a smaller set of changes.",
818 "-H --speed-large-files Assume large files and many scattered small changes.\n",
819 "-v --version Output version info.",
820 "--help Output this help.",
827 char const * const *p;
829 if (callbacks && callbacks->write_stdout)
831 (*callbacks->write_stdout) ("Usage: ");
832 (*callbacks->write_stdout) (diff_program_name);
833 (*callbacks->write_stdout) (" [OPTION]... FILE1 FILE2\n\n");
834 for (p = option_help; *p; p++)
836 (*callbacks->write_stdout) (" ");
837 (*callbacks->write_stdout) (*p);
838 (*callbacks->write_stdout) ("\n");
840 (*callbacks->write_stdout)
841 ("\nIf FILE1 or FILE2 is `-', read standard input.\n");
845 printf ("Usage: %s [OPTION]... FILE1 FILE2\n\n", diff_program_name);
846 for (p = option_help; *p; p++)
847 printf (" %s\n", *p);
848 printf ("\nIf FILE1 or FILE2 is `-', read standard input.\n");
853 specify_format (var, value)
857 int err = *var ? strcmp (*var, value) : 0;
863 specify_style (style)
864 enum output_style style;
866 if (output_style != OUTPUT_NORMAL
867 && output_style != style)
868 diff_error ("conflicting specifications of output style", 0, 0);
869 output_style = style;
874 struct stat const *st;
876 /* See Posix.2 section 4.17.6.1.1 and Table 5-1 for these formats.
877 To keep diagnostics grammatical, the returned string must start
880 if (S_ISREG (st->st_mode))
882 if (st->st_size == 0)
883 return "regular empty file";
884 /* Posix.2 section 5.14.2 seems to suggest that we must read the file
885 and guess whether it's C, Fortran, etc., but this is somewhat useless
886 and doesn't reflect historical practice. We're allowed to guess
887 wrong, so we don't bother to read the file. */
888 return "regular file";
890 if (S_ISDIR (st->st_mode)) return "directory";
892 /* other Posix.1 file types */
894 if (S_ISBLK (st->st_mode)) return "block special file";
897 if (S_ISCHR (st->st_mode)) return "character special file";
900 if (S_ISFIFO (st->st_mode)) return "fifo";
903 /* other Posix.1b file types */
905 if (S_TYPEISMQ (st)) return "message queue";
908 if (S_TYPEISSEM (st)) return "semaphore";
911 if (S_TYPEISSHM (st)) return "shared memory object";
914 /* other popular file types */
915 /* S_ISLNK is impossible with `fstat' and `stat'. */
917 if (S_ISSOCK (st->st_mode)) return "socket";
923 /* Compare two files (or dirs) with specified names
924 DIR0/NAME0 and DIR1/NAME1, at level DEPTH in directory recursion.
925 (if DIR0 is 0, then the name is just NAME0, etc.)
926 This is self-contained; it opens the files and closes them.
928 Value is 0 if files are the same, 1 if different,
929 2 if there is a problem opening them. */
932 compare_files (dir0, name0, dir1, name1, depth)
933 char const *dir0, *dir1;
934 char const *name0, *name1;
937 struct file_data inf[2];
942 char *free0 = 0, *free1 = 0;
944 /* If this is directory comparison, perhaps we have a file
945 that exists only in one of the directories.
946 If so, just print a message to that effect. */
948 if (! ((name0 != 0 && name1 != 0)
949 || (unidirectional_new_file_flag && name1 != 0)
950 || entire_new_file_flag))
952 char const *name = name0 == 0 ? name1 : name0;
953 char const *dir = name0 == 0 ? dir1 : dir0;
954 message ("Only in %s: %s\n", dir, name);
955 /* Return 1 so that diff_dirs will return 1 ("some files differ"). */
959 bzero (inf, sizeof (inf));
961 /* Mark any nonexistent file with -1 in the desc field. */
962 /* Mark unopened files (e.g. directories) with -2. */
964 inf[0].desc = name0 == 0 ? -1 : -2;
965 inf[1].desc = name1 == 0 ? -1 : -2;
967 /* Now record the full name of each file, including nonexistent ones. */
974 inf[0].name = dir0 == 0 ? name0 : (free0 = dir_file_pathname (dir0, name0));
975 inf[1].name = dir1 == 0 ? name1 : (free1 = dir_file_pathname (dir1, name1));
977 /* Stat the files. Record whether they are directories. */
979 for (i = 0; i <= 1; i++)
981 if (inf[i].desc != -1)
985 if (i && filename_cmp (inf[i].name, inf[0].name) == 0)
987 inf[i].stat = inf[0].stat;
990 else if (strcmp (inf[i].name, "-") == 0)
992 inf[i].desc = STDIN_FILENO;
993 stat_result = fstat (STDIN_FILENO, &inf[i].stat);
994 if (stat_result == 0 && S_ISREG (inf[i].stat.st_mode))
996 off_t pos = lseek (STDIN_FILENO, (off_t) 0, SEEK_CUR);
1001 if (pos <= inf[i].stat.st_size)
1002 inf[i].stat.st_size -= pos;
1004 inf[i].stat.st_size = 0;
1005 /* Posix.2 4.17.6.1.4 requires current time for stdin. */
1006 time (&inf[i].stat.st_mtime);
1011 stat_result = stat (inf[i].name, &inf[i].stat);
1013 if (stat_result != 0)
1015 perror_with_name (inf[i].name);
1020 inf[i].dir_p = S_ISDIR (inf[i].stat.st_mode) && inf[i].desc != 0;
1021 if (inf[1 - i].desc == -1)
1023 inf[1 - i].dir_p = inf[i].dir_p;
1024 inf[1 - i].stat.st_mode = inf[i].stat.st_mode;
1030 if (! failed && depth == 0 && inf[0].dir_p != inf[1].dir_p)
1032 /* If one is a directory, and it was specified in the command line,
1033 use the file in that dir with the other file's basename. */
1035 int fnm_arg = inf[0].dir_p;
1036 int dir_arg = 1 - fnm_arg;
1037 char const *fnm = inf[fnm_arg].name;
1038 char const *dir = inf[dir_arg].name;
1039 char const *p = filename_lastdirchar (fnm);
1040 char const *filename = inf[dir_arg].name
1041 = dir_file_pathname (dir, p ? p + 1 : fnm);
1043 if (strcmp (fnm, "-") == 0)
1044 fatal ("can't compare - to a directory");
1046 if (stat (filename, &inf[dir_arg].stat) != 0)
1048 perror_with_name (filename);
1052 inf[dir_arg].dir_p = S_ISDIR (inf[dir_arg].stat.st_mode);
1058 /* If either file should exist but does not, return 2. */
1063 else if ((same_files = inf[0].desc != -1 && inf[1].desc != -1
1064 && 0 < same_file (&inf[0].stat, &inf[1].stat))
1065 && no_diff_means_no_output)
1067 /* The two named files are actually the same physical file.
1068 We know they are identical without actually reading them. */
1072 else if (inf[0].dir_p & inf[1].dir_p)
1074 if (output_style == OUTPUT_IFDEF)
1075 fatal ("-D option not supported with directories");
1077 /* If both are directories, compare the files in them. */
1079 if (depth > 0 && !recursive)
1081 /* But don't compare dir contents one level down
1082 unless -r was specified. */
1083 message ("Common subdirectories: %s and %s\n",
1084 inf[0].name, inf[1].name);
1089 val = diff_dirs (inf, compare_files, depth);
1093 else if ((inf[0].dir_p | inf[1].dir_p)
1095 && (! S_ISREG (inf[0].stat.st_mode)
1096 || ! S_ISREG (inf[1].stat.st_mode))))
1098 /* Perhaps we have a subdirectory that exists only in one directory.
1099 If so, just print a message to that effect. */
1101 if (inf[0].desc == -1 || inf[1].desc == -1)
1103 if ((inf[0].dir_p | inf[1].dir_p)
1105 && (entire_new_file_flag
1106 || (unidirectional_new_file_flag && inf[0].desc == -1)))
1107 val = diff_dirs (inf, compare_files, depth);
1110 char const *dir = (inf[0].desc == -1) ? dir1 : dir0;
1111 /* See Posix.2 section 4.17.6.1.1 for this format. */
1112 message ("Only in %s: %s\n", dir, name0);
1118 /* We have two files that are not to be compared. */
1120 /* See Posix.2 section 4.17.6.1.1 for this format. */
1121 message5 ("File %s is a %s while file %s is a %s\n",
1122 inf[0].name, filetype (&inf[0].stat),
1123 inf[1].name, filetype (&inf[1].stat));
1125 /* This is a difference. */
1129 else if ((no_details_flag & ~ignore_some_changes)
1130 && inf[0].stat.st_size != inf[1].stat.st_size
1131 && (inf[0].desc == -1 || S_ISREG (inf[0].stat.st_mode))
1132 && (inf[1].desc == -1 || S_ISREG (inf[1].stat.st_mode)))
1134 message ("Files %s and %s differ\n", inf[0].name, inf[1].name);
1139 /* Both exist and neither is a directory. */
1141 /* Open the files and record their descriptors. */
1143 if (inf[0].desc == -2)
1144 if ((inf[0].desc = open (inf[0].name, O_RDONLY, 0)) < 0)
1146 perror_with_name (inf[0].name);
1149 if (inf[1].desc == -2)
1151 inf[1].desc = inf[0].desc;
1152 else if ((inf[1].desc = open (inf[1].name, O_RDONLY, 0)) < 0)
1154 perror_with_name (inf[1].name);
1160 for (i = 0; i <= 1; i++)
1161 if (0 <= inf[i].desc)
1162 setmode (inf[i].desc, O_BINARY);
1165 /* Compare the files, if no error was found. */
1167 val = failed ? 2 : diff_2_files (inf, depth);
1169 /* Close the file descriptors. */
1171 if (inf[0].desc >= 0 && close (inf[0].desc) != 0)
1173 perror_with_name (inf[0].name);
1176 if (inf[1].desc >= 0 && inf[0].desc != inf[1].desc
1177 && close (inf[1].desc) != 0)
1179 perror_with_name (inf[1].name);
1184 /* Now the comparison has been done, if no error prevented it,
1185 and VAL is the value this function will return. */
1187 if (val == 0 && !inf[0].dir_p)
1189 if (print_file_same_flag)
1190 message ("Files %s and %s are identical\n",
1191 inf[0].name, inf[1].name);
1204 /* Initialize status variables and flag variables used in libdiff,
1205 to permit repeated calls to diff_run. */
1208 initialize_main (argcp, argvp)
1212 /* These variables really must be reset each time diff_run is called. */
1213 output_style = OUTPUT_NORMAL;
1215 file_label[0] = NULL;
1216 file_label[1] = NULL;
1217 diff_program_name = (*argvp)[0];
1220 /* Reset these also, just for safety's sake. (If one invocation turns
1221 on ignore_case_flag, it must be turned off before diff_run is called
1222 again. But it is possible to make many diffs before encountering
1229 no_diff_means_no_output = 0;
1230 always_text_flag = 0;
1232 ignore_space_change_flag = 0;
1233 ignore_all_space_flag = 0;
1234 ignore_blank_lines_flag = 0;
1235 ignore_some_line_changes = 0;
1236 ignore_some_changes = 0;
1237 ignore_case_flag = 0;
1238 function_regexp_list = NULL;
1239 ignore_regexp_list = NULL;
1240 no_details_flag = 0;
1241 print_file_same_flag = 0;
1243 tab_expand_flag = 0;
1244 dir_start_file = NULL;
1245 entire_new_file_flag = 0;
1246 unidirectional_new_file_flag = 0;
1248 bzero (group_format, sizeof (group_format));
1249 bzero (line_format, sizeof (line_format));
1250 sdiff_help_sdiff = 0;
1251 sdiff_left_only = 0;
1252 sdiff_skip_common_lines = 0;
1253 sdiff_half_width = 0;
1254 sdiff_column2_offset = 0;
1255 switch_string = NULL;
1257 bzero (files, sizeof (files));