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/* Shared definitions for GNU DIFF
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Copyright (C) 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1998, 2001,
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2002 Free Software Foundation, Inc.
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This file is part of GNU DIFF.
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GNU DIFF is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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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 this program; see the file COPYING.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* What kind of changes a hunk contains. */
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/* No changes: lines common to both files. */
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/* Deletes only: lines taken from just the first file. */
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/* Inserts only: lines taken from just the second file. */
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/* Both deletes and inserts: a hunk containing both old and new lines. */
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/* Variables for command line options */
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/* No output style specified. */
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/* Default output style. */
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/* Output the differences with lines of context before and after (-c). */
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/* Output the differences in a unified context diff format (-u). */
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/* Output the differences as commands suitable for `ed' (-e). */
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/* Output the diff as a forward ed script (-f). */
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/* Like -f, but output a count of changed lines in each "command" (-n). */
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/* Output merged #ifdef'd file (-D). */
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/* Output sdiff style (-y). */
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/* True for output styles that are robust,
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i.e. can handle a file that ends in a non-newline. */
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#define ROBUST_OUTPUT_STYLE(S) ((S) != OUTPUT_ED && (S) != OUTPUT_FORWARD_ED)
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XTERN enum output_style output_style;
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/* Nonzero if output cannot be generated for identical files. */
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XTERN bool no_diff_means_no_output;
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/* Number of lines of context to show in each set of diffs.
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This is zero when context is not to be shown. */
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/* Consider all files as text files (-a).
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Don't interpret codes over 0177 as implying a "binary file". */
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/* Number of lines to keep in identical prefix and suffix. */
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XTERN lin horizon_lines;
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/* The significance of white space during comparisons. */
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/* All white space is significant (the default). */
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IGNORE_NO_WHITE_SPACE,
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/* Ignore changes due to tab expansion (-E). */
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IGNORE_TAB_EXPANSION,
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/* Ignore changes in horizontal white space (-b). */
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/* Ignore all horizontal white space (-w). */
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} ignore_white_space;
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/* Ignore changes that affect only blank lines (-B). */
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XTERN bool ignore_blank_lines;
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/* Files can be compared byte-by-byte, as if they were binary.
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This depends on various options. */
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XTERN bool files_can_be_treated_as_binary;
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/* Ignore differences in case of letters (-i). */
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XTERN bool ignore_case;
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/* Ignore differences in case of letters in file names. */
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XTERN bool ignore_file_name_case;
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/* File labels for `-c' output headers (--label). */
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XTERN char *file_label[2];
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/* Regexp to identify function-header lines (-F). */
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XTERN struct re_pattern_buffer function_regexp;
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/* Ignore changes that affect only lines matching this regexp (-I). */
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XTERN struct re_pattern_buffer ignore_regexp;
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/* Say only whether files differ, not how (-q). */
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/* Expand tabs in the output so the text lines up properly
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despite the characters added to the front of each line (-t). */
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XTERN bool expand_tabs;
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/* Use a tab in the output, rather than a space, before the text of an
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input line, so as to keep the proper alignment in the input line
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without changing the characters in it (-T). */
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XTERN bool initial_tab;
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/* Remove trailing carriage returns from input. */
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XTERN bool strip_trailing_cr;
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/* In directory comparison, specify file to start with (-S).
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This is used for resuming an aborted comparison.
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All file names less than this name are ignored. */
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XTERN char const *starting_file;
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/* Pipe each file's output through pr (-l). */
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/* Line group formats for unchanged, old, new, and changed groups. */
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XTERN char const *group_format[CHANGED + 1];
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/* Line formats for unchanged, old, and new lines. */
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XTERN char const *line_format[NEW + 1];
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/* If using OUTPUT_SDIFF print extra information to help the sdiff filter. */
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XTERN bool sdiff_merge_assist;
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/* Tell OUTPUT_SDIFF to show only the left version of common lines. */
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XTERN bool left_column;
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/* Tell OUTPUT_SDIFF to not show common lines. */
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XTERN bool suppress_common_lines;
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/* The half line width and column 2 offset for OUTPUT_SDIFF. */
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XTERN unsigned int sdiff_half_width;
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XTERN unsigned int sdiff_column2_offset;
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/* String containing all the command options diff received,
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with spaces between and at the beginning but none at the end.
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If there were no options given, this string is empty. */
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XTERN char *switch_string;
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/* Use heuristics for better speed with large files with a small
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density of changes. */
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XTERN bool speed_large_files;
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/* Patterns that match file names to be excluded. */
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XTERN struct exclude *excluded;
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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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/* Name of program the user invoked (for error messages). */
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XTERN char *program_name;
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/* The strftime format to use for time strings. */
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XTERN char const *time_format;
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/* The result of comparison is an "edit script": a chain of `struct change'.
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Each `struct change' represents one place where some lines are deleted
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and some are inserted.
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LINE0 and LINE1 are the first affected lines in the two files (origin 0).
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DELETED is the number of lines deleted here from file 0.
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INSERTED is the number of lines inserted here in file 1.
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If DELETED is 0 then LINE0 is the number of the line before
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which the insertion was done; vice versa for INSERTED and LINE1. */
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struct change *link; /* Previous or next edit command */
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lin inserted; /* # lines of file 1 changed here. */
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lin deleted; /* # lines of file 0 changed here. */
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lin line0; /* Line number of 1st deleted line. */
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lin line1; /* Line number of 1st inserted line. */
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bool ignore; /* Flag used in context.c. */
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/* Structures that describe the input files. */
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/* Data on one input file being compared. */
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int desc; /* File descriptor */
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char const *name; /* File name */
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struct stat stat; /* File status */
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/* Buffer in which text of file is read. */
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/* Allocated size of buffer, in bytes. Always a multiple of
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/* Number of valid bytes now in the buffer. */
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/* Array of pointers to lines in the file. */
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/* linbuf_base <= buffered_lines <= valid_lines <= alloc_lines.
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linebuf[linbuf_base ... buffered_lines - 1] are possibly differing.
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linebuf[linbuf_base ... valid_lines - 1] contain valid data.
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linebuf[linbuf_base ... alloc_lines - 1] are allocated. */
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lin linbuf_base, buffered_lines, valid_lines, alloc_lines;
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/* Pointer to end of prefix of this file to ignore when hashing. */
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char const *prefix_end;
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/* Count of lines in the prefix.
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There are this many lines in the file before linbuf[0]. */
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/* Pointer to start of suffix of this file to ignore when hashing. */
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char const *suffix_begin;
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/* Vector, indexed by line number, containing an equivalence code for
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each line. It is this vector that is actually compared with that
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of another file to generate differences. */
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/* Vector, like the previous one except that
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the elements for discarded lines have been squeezed out. */
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/* Vector mapping virtual line numbers (not counting discarded lines)
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to real ones (counting those lines). Both are origin-0. */
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/* Total number of nondiscarded lines. */
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lin nondiscarded_lines;
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/* Vector, indexed by real origin-0 line number,
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containing TRUE for a line that is an insertion or a deletion.
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The results of comparison are stored here. */
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/* 1 if file ends in a line with no final newline. */
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bool missing_newline;
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/* 1 if at end of file. */
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/* 1 more than the maximum equivalence value used for this or its
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/* The file buffer, considered as an array of bytes rather than
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as an array of words. */
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#define FILE_BUFFER(f) ((char *) (f)->buffer)
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/* Data on two input files being compared. */
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struct file_data file[2];
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struct comparison const *parent; /* parent, if a recursive comparison */
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/* Describe the two files currently being compared. */
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XTERN struct file_data files[2];
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/* Stdio stream to output diffs to. */
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/* Declare various functions. */
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int diff_2_files (struct comparison *);
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void print_context_header (struct file_data[], bool);
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void print_context_script (struct change *, bool);
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int diff_dirs (struct comparison const *, int (*) (struct comparison const *, char const *, char const *));
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void print_ed_script (struct change *);
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void pr_forward_ed_script (struct change *);
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void print_ifdef_script (struct change *);
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void file_block_read (struct file_data *, size_t);
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bool read_files (struct file_data[], bool);
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void print_normal_script (struct change *);
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void print_rcs_script (struct change *);
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void print_sdiff_script (struct change *);
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extern char const change_letter[4];
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extern char const pr_program[];
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char *concat (char const *, char const *, char const *);
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char *dir_file_pathname (char const *, char const *);
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bool lines_differ (char const *, char const *);
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lin translate_line_number (struct file_data const *, lin);
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struct change *find_change (struct change *);
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struct change *find_reverse_change (struct change *);
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void *zalloc (size_t);
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enum changes analyze_hunk (struct change *, lin *, lin *, lin *, lin *);
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void begin_output (void);
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void debug_script (struct change *);
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void fatal (char const *) __attribute__((noreturn));
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void finish_output (void);
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void message (char const *, char const *, char const *);
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void message5 (char const *, char const *, char const *, char const *, char const *);
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void output_1_line (char const *, char const *, char const *, char const *);
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void perror_with_name (char const *);
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void pfatal_with_name (char const *) __attribute__((noreturn));
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void print_1_line (char const *, char const * const *);
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void print_message_queue (void);
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void print_number_range (char, struct file_data *, lin, lin);
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void print_script (struct change *, struct change * (*) (struct change *), void (*) (struct change *));
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void setup_output (char const *, char const *, bool);
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void translate_range (struct file_data const *, lin, lin, long *, long *);
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extern char const version_string[];
added
removed
src/diff.h
