693 lines
18 KiB
C
693 lines
18 KiB
C
/* GNU DIFF main routine.
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Copyright (C) 1988, 1989 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 1, or (at your option)
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any later version.
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GNU DIFF is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU DIFF; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* GNU DIFF was written by Mike Haertel, David Hayes,
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Richard Stallman and Len Tower. */
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#define GDIFF_MAIN
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#include "regex.h"
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#include "diff.h"
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#include "getopt.h"
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/* Nonzero for -r: if comparing two directories,
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compare their common subdirectories recursively. */
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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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/* The numbers 129 and 130 that appear in the fourth element
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for the context and unidiff entries are used as a way of
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telling 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, 129},
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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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{"file-label", 1, 0, 'L'},
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{"entire-new-files", 0, 0, 'N'},
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{"new-files", 0, 0, 'N'},
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{"starting-file", 1, 0, 'S'},
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{"initial-tab", 0, 0, 'T'},
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{"text", 0, 0, 'a'},
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{"all-text", 0, 0, 'a'},
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{"ascii", 0, 0, 'a'},
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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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{"reversed-ed", 0, 0, 'f'},
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{"ignore-case", 0, 0, 'i'},
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{"print", 0, 0, 'l'},
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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'},
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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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{"ignore-all-space", 0, 0, 'w'},
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{"unified", 2, 0, 130},
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{"version", 0, 0, 'v'},
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{0, 0, 0, 0}
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};
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main (argc, argv)
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int argc;
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char *argv[];
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{
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int val;
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int c;
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int prev = -1;
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int longind;
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extern char *version_string;
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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 = 0;
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function_regexp = 0;
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print_file_same_flag = FALSE;
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entire_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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ifdef_string = NULL;
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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:nNpqrsS:tTuvw",
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longopts, &longind)) != EOF)
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{
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if (c == 0) /* Long option. */
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c = longopts[longind].val;
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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':
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case 129: /* +context[=lines] */
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case 130: /* +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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{
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char *p;
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for (p = optarg; *p; p++)
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if (*p < '0' || *p > '9')
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fatal ("invalid context length argument");
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}
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context = atoi (optarg);
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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 == 130 ? OUTPUT_UNIFIED : OUTPUT_CONTEXT);
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break;
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case 'd':
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/* Don't discard lines. This makes things slower (sometimes much
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slower) but will find a guaranteed minimal set of changes. */
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no_discards = 1;
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break;
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case 'D':
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/* Make merged #ifdef output. */
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specify_style (OUTPUT_IFDEF);
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ifdef_string = optarg;
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break;
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case 'e':
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/* Make output that is a valid `ed' script. */
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specify_style (OUTPUT_ED);
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break;
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case 'f':
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/* Make output that looks vaguely like an `ed' script
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but has changes in the order they appear in the file. */
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specify_style (OUTPUT_FORWARD_ED);
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break;
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case 'F':
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/* Show, for each set of changes, the previous line that
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matches the specified regexp. Currently affects only
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context-style output. */
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function_regexp = optarg;
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break;
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case 'h':
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/* Split the files into chunks of around 1500 lines
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for faster processing. Usually does not change the result.
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This currently has no effect. */
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break;
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case 'H':
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/* Turn on heuristics that speed processing of large files
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with a small density of changes. */
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heuristic = 1;
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break;
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case 'i':
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/* Ignore changes in case. */
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ignore_case_flag = 1;
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break;
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case 'I':
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/* Ignore changes affecting only lines that match the
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specified regexp. */
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ignore_regexp = optarg;
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break;
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case 'l':
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/* Pass the output through `pr' to paginate it. */
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paginate_flag = 1;
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break;
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case 'L':
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/* Specify file labels for `-c' output headers. */
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if (!file_label[0])
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file_label[0] = optarg;
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else if (!file_label[1])
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file_label[1] = optarg;
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else
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fatal ("too many file label options");
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break;
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case 'n':
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/* Output RCS-style diffs, like `-f' except that each command
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specifies the number of lines affected. */
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specify_style (OUTPUT_RCS);
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break;
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case 'N':
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/* When comparing directories, if a file appears only in one
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directory, treat it as present but empty in the other. */
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entire_new_file_flag = 1;
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break;
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case 'p':
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/* Make context-style output and show name of last C function. */
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specify_style (OUTPUT_CONTEXT);
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function_regexp = "^[_a-zA-Z]";
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break;
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case 'q':
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no_details_flag = 1;
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break;
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case 'r':
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/* When comparing directories,
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recursively compare any subdirectories found. */
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recursive = 1;
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break;
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case 's':
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/* Print a message if the files are the same. */
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print_file_same_flag = 1;
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break;
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case 'S':
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/* When comparing directories, start with the specified
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file name. This is used for resuming an aborted comparison. */
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dir_start_file = optarg;
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break;
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case 't':
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/* Expand tabs to spaces in the output so that it preserves
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the alignment of the input files. */
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tab_expand_flag = 1;
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break;
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case 'T':
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/* Use a tab in the output, rather than a space, before the
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text of an input line, so as to keep the proper alignment
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in the input line without changing the characters in it. */
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tab_align_flag = 1;
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break;
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case 'v':
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printf ("GNU diff version %s\n", version_string);
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break;
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case 'u':
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/* Output the context diff in unidiff format. */
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specify_style (OUTPUT_UNIFIED);
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break;
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case 'w':
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/* Ignore horizontal whitespace when comparing lines. */
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ignore_all_space_flag = 1;
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length_varies = 1;
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break;
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default:
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usage ();
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}
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prev = c;
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}
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if (optind != argc - 2)
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usage ();
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if (ignore_regexp)
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{
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char *val;
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bzero (&ignore_regexp_compiled, sizeof ignore_regexp_compiled);
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val = re_compile_pattern (ignore_regexp, strlen (ignore_regexp),
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&ignore_regexp_compiled);
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if (val != 0)
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error ("%s: %s", ignore_regexp, val);
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ignore_regexp_compiled.fastmap = (char *) xmalloc (256);
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}
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if (function_regexp)
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{
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char *val;
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bzero (&function_regexp_compiled, sizeof function_regexp_compiled);
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val = re_compile_pattern (function_regexp, strlen (function_regexp),
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&function_regexp_compiled);
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if (val != 0)
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error ("%s: %s", function_regexp, val);
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function_regexp_compiled.fastmap = (char *) xmalloc (256);
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}
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if (output_style != OUTPUT_CONTEXT && output_style != OUTPUT_UNIFIED)
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context = 0;
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else if (context == -1)
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/* Default amount of context for -c. */
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context = 3;
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switch_string = option_list (argv + 1, optind - 1);
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val = compare_files (0, argv[optind], 0, argv[optind + 1], 0);
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/* Print any messages that were saved up for last. */
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print_message_queue ();
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if (ferror (stdout) || fclose (stdout) != 0)
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fatal ("write error");
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exit (val);
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}
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usage ()
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{
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fprintf (stderr, "\
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Usage: diff [-#] [-abBcdefhHilnNprstTuvw] [-C lines] [-F regexp] [-I regexp]\n\
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[-L label [-L label]] [-S file] [-D symbol] [+ignore-blank-lines]\n\
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[+context[=lines]] [+unified[=lines]] [+ifdef=symbol]\n\
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[+show-function-line=regexp]\n");
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fprintf (stderr, "\
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[+speed-large-files] [+ignore-matching-lines=regexp] [+new-file]\n\
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[+initial-tab] [+starting-file=file] [+text] [+all-text] [+ascii]\n\
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[+minimal] [+ignore-space-change] [+ed] [+reversed-ed] [+ignore-case]\n");
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fprintf (stderr, "\
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[+print] [+rcs] [+show-c-function] [+binary] [+brief] [+recursive]\n\
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[+report-identical-files] [+expand-tabs] [+ignore-all-space]\n\
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[+file-label=label [+file-label=label]] [+version] path1 path2\n");
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exit (2);
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}
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specify_style (style)
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enum output_style style;
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{
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if (output_style != OUTPUT_NORMAL
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&& output_style != style)
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error ("conflicting specifications of output style");
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output_style = style;
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}
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/* Compare two files (or dirs) with specified names
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DIR0/NAME0 and DIR1/NAME1, at level DEPTH in directory recursion.
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(if DIR0 is 0, then the name is just NAME0, etc.)
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This is self-contained; it opens the files and closes them.
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Value is 0 if files are identical, 1 if different,
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2 if there is a problem opening them. */
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int
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compare_files (dir0, name0, dir1, name1, depth)
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char *dir0, *dir1;
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char *name0, *name1;
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int depth;
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{
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static char Standard_Input[] = "Standard Input";
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struct file_data inf[2];
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register int i;
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int val;
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int errorcount = 0;
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int stat_result[2];
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/* If this is directory comparison, perhaps we have a file
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that exists only in one of the directories.
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If so, just print a message to that effect. */
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if (! entire_new_file_flag && (name0 == 0 || name1 == 0))
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{
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char *name = name0 == 0 ? name1 : name0;
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char *dir = name0 == 0 ? dir1 : dir0;
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message ("Only in %s: %s\n", dir, name);
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/* Return 1 so that diff_dirs will return 1 ("some files differ"). */
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return 1;
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}
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/* Mark any nonexistent file with -1 in the desc field. */
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/* Mark unopened files (i.e. directories) with -2. */
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inf[0].desc = name0 == 0 ? -1 : -2;
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inf[1].desc = name1 == 0 ? -1 : -2;
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/* Now record the full name of each file, including nonexistent ones. */
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if (name0 == 0)
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name0 = name1;
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if (name1 == 0)
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name1 = name0;
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inf[0].name = dir0 == 0 ? name0 : concat (dir0, "/", name0);
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inf[1].name = dir1 == 0 ? name1 : concat (dir1, "/", name1);
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/* Stat the files. Record whether they are directories.
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Record in stat_result whether stat fails. */
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for (i = 0; i <= 1; i++)
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{
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bzero (&inf[i].stat, sizeof(struct stat));
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inf[i].dir_p = 0;
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stat_result[i] = 0;
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if (inf[i].desc != -1)
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{
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char *filename = inf[i].name;
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stat_result[i] =
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strcmp (filename, "-")
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? stat (filename, &inf[i].stat)
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: fstat (0, &inf[i].stat);
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if (stat_result[i] < 0)
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{
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perror_with_name (filename);
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errorcount = 1;
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}
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else
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inf[i].dir_p =
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S_IFDIR == (inf[i].stat.st_mode & S_IFMT)
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&& strcmp (filename, "-");
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}
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}
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/* See if the two named files are actually the same physical file.
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If so, we know they are identical without actually reading them. */
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if (output_style != OUTPUT_IFDEF
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&& inf[0].stat.st_ino == inf[1].stat.st_ino
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&& inf[0].stat.st_dev == inf[1].stat.st_dev
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&& stat_result[0] == 0
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&& stat_result[1] == 0)
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{
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val = 0;
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goto done;
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}
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if (name0 == 0)
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inf[0].dir_p = inf[1].dir_p;
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if (name1 == 0)
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inf[1].dir_p = inf[0].dir_p;
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/* Open the files and record their descriptors. */
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for (i = 0; i <= 1; i++)
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{
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if (inf[i].desc == -1)
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;
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else if (!strcmp (inf[i].name, "-"))
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{
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inf[i].desc = 0;
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inf[i].name = Standard_Input;
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}
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/* Don't bother opening if stat already failed. */
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else if (stat_result[i] == 0 && ! inf[i].dir_p)
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{
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char *filename = inf[i].name;
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||
inf[i].desc = open (filename, O_RDONLY, 0);
|
||
if (0 > inf[i].desc)
|
||
{
|
||
perror_with_name (filename);
|
||
errorcount = 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (errorcount)
|
||
{
|
||
|
||
/* If either file should exist but fails to be opened, return 2. */
|
||
|
||
val = 2;
|
||
|
||
}
|
||
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[0].name, inf[1].name,
|
||
compare_files, depth, 0, 0);
|
||
}
|
||
|
||
}
|
||
else if (depth == 0 && (inf[0].dir_p || inf[1].dir_p))
|
||
{
|
||
|
||
/* If only one is a directory, and it was specified in the command line,
|
||
use the file in that dir whose basename matches the other file. */
|
||
|
||
int dir_arg = (inf[0].dir_p ? 0 : 1);
|
||
int fnm_arg = (inf[0].dir_p ? 1 : 0);
|
||
char *p = rindex (inf[fnm_arg].name, '/');
|
||
char *filename = concat (inf[dir_arg].name, "/",
|
||
(p ? p+1 : inf[fnm_arg].name));
|
||
|
||
if (inf[fnm_arg].name == Standard_Input)
|
||
fatal ("can't compare - to a directory");
|
||
|
||
inf[dir_arg].desc = open (filename, O_RDONLY, 0);
|
||
|
||
if (0 > inf[dir_arg].desc)
|
||
{
|
||
perror_with_name (filename);
|
||
val = 2;
|
||
}
|
||
else
|
||
{
|
||
/* JF: patch from the net to check and make sure we can really free
|
||
this. If it's from argv[], freeing it is a *really* bad idea */
|
||
if (0 != (dir_arg ? dir1 : dir0))
|
||
free (inf[dir_arg].name);
|
||
inf[dir_arg].name = filename;
|
||
if (fstat (inf[dir_arg].desc, &inf[dir_arg].stat) < 0)
|
||
pfatal_with_name (inf[dir_arg].name);
|
||
|
||
inf[dir_arg].dir_p
|
||
= (S_IFDIR == (inf[dir_arg].stat.st_mode & S_IFMT));
|
||
if (inf[dir_arg].dir_p)
|
||
{
|
||
error ("%s is a directory but %s is not",
|
||
inf[dir_arg].name, inf[fnm_arg].name);
|
||
val = 1;
|
||
}
|
||
else
|
||
val = diff_2_files (inf, depth);
|
||
}
|
||
|
||
}
|
||
else if (depth > 0 && (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 (entire_new_file_flag && recursive)
|
||
val = diff_dirs (inf[0].name, inf[1].name, compare_files, depth,
|
||
inf[0].desc == -1, inf[1].desc == -1);
|
||
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. */
|
||
|
||
if (inf[0].dir_p)
|
||
message ("%s is a directory but %s is not\n",
|
||
inf[0].name, inf[1].name);
|
||
else
|
||
message ("%s is a directory but %s is not\n",
|
||
inf[1].name, inf[0].name);
|
||
/* This is a difference. */
|
||
val = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
|
||
/* Both exist and both are ordinary files. */
|
||
|
||
val = diff_2_files (inf, depth);
|
||
|
||
}
|
||
|
||
/* Now the comparison has been done, if no error prevented it,
|
||
and VAL is the value this function will return. */
|
||
|
||
if (inf[0].desc >= 0)
|
||
close (inf[0].desc);
|
||
if (inf[1].desc >= 0)
|
||
close (inf[1].desc);
|
||
|
||
done:
|
||
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;
|
||
}
|